vendor: google.golang.org/grpc v1.58.3

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

vendor.mod

@@ -84,7 +84,7 @@ require (
 	golang.org/x/net v0.17.0 // indirect
 	golang.org/x/time v0.3.0 // indirect
 	golang.org/x/tools v0.10.0 // indirect
-	google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1 // indirect
-	google.golang.org/grpc v1.56.3 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20230711160842-782d3b101e98 // indirect
+	google.golang.org/grpc v1.58.3 // indirect
 	google.golang.org/protobuf v1.31.0 // indirect
 )

vendor.sum

@@ -355,11 +355,13 @@ golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8T
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1 h1:KpwkzHKEF7B9Zxg18WzOa7djJ+Ha5DzthMyZYQfEn2A=
-google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1/go.mod h1:nKE/iIaLqn2bQwXBg8f1g2Ylh6r5MN5CmZvuzZCgsCU=
+google.golang.org/genproto v0.0.0-20230711160842-782d3b101e98 h1:Z0hjGZePRE0ZBWotvtrwxFNrNE9CUAGtplaDK5NNI/g=
+google.golang.org/genproto/googleapis/api v0.0.0-20230711160842-782d3b101e98 h1:FmF5cCW94Ij59cfpoLiwTgodWmm60eEV0CjlsVg2fuw=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20230711160842-782d3b101e98 h1:bVf09lpb+OJbByTj913DRJioFFAjf/ZGxEz7MajTp2U=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20230711160842-782d3b101e98/go.mod h1:TUfxEVdsvPg18p6AslUXFoLdpED4oBnGwyqk3dV1XzM=
 google.golang.org/grpc v1.0.5/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
-google.golang.org/grpc v1.56.3 h1:8I4C0Yq1EjstUzUJzpcRVbuYA2mODtEmpWiQoN/b2nc=
-google.golang.org/grpc v1.56.3/go.mod h1:I9bI3vqKfayGqPUAwGdOSu7kt6oIJLixfffKrpXqQ9s=
+google.golang.org/grpc v1.58.3 h1:BjnpXut1btbtgN/6sp+brB2Kbm2LjNXnidYujAVbSoQ=
+google.golang.org/grpc v1.58.3/go.mod h1:tgX3ZQDlNJGU96V6yHh1T/JeoBQ2TXdr43YbYSsCJk0=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 google.golang.org/protobuf v1.31.0 h1:g0LDEJHgrBl9N9r17Ru3sqWhkIx2NB67okBHPwC7hs8=

vendor/google.golang.org/grpc/README.md

@@ -14,21 +14,14 @@ RPC framework that puts mobile and HTTP/2 first. For more information see the
 
 ## Installation
 
-With [Go module][] support (Go 1.11+), simply add the following import
+Simply add the following import to your code, and then `go [build|run|test]`
+will automatically fetch the necessary dependencies:
+
 
 ```go
 import "google.golang.org/grpc"
 ```
 
-to your code, and then `go [build|run|test]` will automatically fetch the
-necessary dependencies.
-
-Otherwise, to install the `grpc-go` package, run the following command:
-
-```console
-$ go get -u google.golang.org/grpc
-```
-
 > **Note:** If you are trying to access `grpc-go` from **China**, see the
 > [FAQ](#FAQ) below.
 
@@ -56,15 +49,6 @@ To build Go code, there are several options:
 
 - Set up a VPN and access google.golang.org through that.
 
-- Without Go module support: `git clone` the repo manually:
-
-  ```sh
-  git clone https://github.com/grpc/grpc-go.git $GOPATH/src/google.golang.org/grpc
-  ```
-
-  You will need to do the same for all of grpc's dependencies in `golang.org`,
-  e.g. `golang.org/x/net`.
-
 - With Go module support: it is possible to use the `replace` feature of `go
   mod` to create aliases for golang.org packages.  In your project's directory:
 
@@ -76,33 +60,13 @@ To build Go code, there are several options:
   ```
 
   Again, this will need to be done for all transitive dependencies hosted on
-  golang.org as well. For details, refer to [golang/go issue #28652](https://github.com/golang/go/issues/28652).
+  golang.org as well. For details, refer to [golang/go issue
+  #28652](https://github.com/golang/go/issues/28652).
 
 ### Compiling error, undefined: grpc.SupportPackageIsVersion
 
-#### If you are using Go modules:
-
-Ensure your gRPC-Go version is `require`d at the appropriate version in
-the same module containing the generated `.pb.go` files.  For example,
-`SupportPackageIsVersion6` needs `v1.27.0`, so in your `go.mod` file:
-
-```go
-module <your module name>
-
-require (
-    google.golang.org/grpc v1.27.0
-)
-```
-
-#### If you are *not* using Go modules:
-
-Update the `proto` package, gRPC package, and rebuild the `.proto` files:
-
-```sh
-go get -u github.com/golang/protobuf/{proto,protoc-gen-go}
-go get -u google.golang.org/grpc
-protoc --go_out=plugins=grpc:. *.proto
-```
+Please update to the latest version of gRPC-Go using
+`go get google.golang.org/grpc`.
 
 ### How to turn on logging
 
@@ -121,9 +85,11 @@ possible reasons, including:
  1. mis-configured transport credentials, connection failed on handshaking
  1. bytes disrupted, possibly by a proxy in between
  1. server shutdown
- 1. Keepalive parameters caused connection shutdown, for example if you have configured
-    your server to terminate connections regularly to [trigger DNS lookups](https://github.com/grpc/grpc-go/issues/3170#issuecomment-552517779).
-    If this is the case, you may want to increase your [MaxConnectionAgeGrace](https://pkg.go.dev/google.golang.org/grpc/keepalive?tab=doc#ServerParameters),
+ 1. Keepalive parameters caused connection shutdown, for example if you have
+    configured your server to terminate connections regularly to [trigger DNS
+    lookups](https://github.com/grpc/grpc-go/issues/3170#issuecomment-552517779).
+    If this is the case, you may want to increase your
+    [MaxConnectionAgeGrace](https://pkg.go.dev/google.golang.org/grpc/keepalive?tab=doc#ServerParameters),
     to allow longer RPC calls to finish.
 
 It can be tricky to debug this because the error happens on the client side but

vendor/google.golang.org/grpc/attributes/attributes.go

@@ -34,26 +34,26 @@ import (
 // key/value pairs.  Keys must be hashable, and users should define their own
 // types for keys.  Values should not be modified after they are added to an
 // Attributes or if they were received from one.  If values implement 'Equal(o
-// interface{}) bool', it will be called by (*Attributes).Equal to determine
-// whether two values with the same key should be considered equal.
+// any) bool', it will be called by (*Attributes).Equal to determine whether
+// two values with the same key should be considered equal.
 type Attributes struct {
-	m map[interface{}]interface{}
+	m map[any]any
 }
 
 // New returns a new Attributes containing the key/value pair.
-func New(key, value interface{}) *Attributes {
-	return &Attributes{m: map[interface{}]interface{}{key: value}}
+func New(key, value any) *Attributes {
+	return &Attributes{m: map[any]any{key: value}}
 }
 
 // WithValue returns a new Attributes containing the previous keys and values
 // and the new key/value pair.  If the same key appears multiple times, the
 // last value overwrites all previous values for that key.  To remove an
 // existing key, use a nil value.  value should not be modified later.
-func (a *Attributes) WithValue(key, value interface{}) *Attributes {
+func (a *Attributes) WithValue(key, value any) *Attributes {
 	if a == nil {
 		return New(key, value)
 	}
-	n := &Attributes{m: make(map[interface{}]interface{}, len(a.m)+1)}
+	n := &Attributes{m: make(map[any]any, len(a.m)+1)}
 	for k, v := range a.m {
 		n.m[k] = v
 	}
@@ -63,20 +63,19 @@ func (a *Attributes) WithValue(key, value interface{}) *Attributes {
 
 // Value returns the value associated with these attributes for key, or nil if
 // no value is associated with key.  The returned value should not be modified.
-func (a *Attributes) Value(key interface{}) interface{} {
+func (a *Attributes) Value(key any) any {
 	if a == nil {
 		return nil
 	}
 	return a.m[key]
 }
 
-// Equal returns whether a and o are equivalent.  If 'Equal(o interface{})
-// bool' is implemented for a value in the attributes, it is called to
-// determine if the value matches the one stored in the other attributes.  If
-// Equal is not implemented, standard equality is used to determine if the two
-// values are equal. Note that some types (e.g. maps) aren't comparable by
-// default, so they must be wrapped in a struct, or in an alias type, with Equal
-// defined.
+// Equal returns whether a and o are equivalent.  If 'Equal(o any) bool' is
+// implemented for a value in the attributes, it is called to determine if the
+// value matches the one stored in the other attributes.  If Equal is not
+// implemented, standard equality is used to determine if the two values are
+// equal. Note that some types (e.g. maps) aren't comparable by default, so
+// they must be wrapped in a struct, or in an alias type, with Equal defined.
 func (a *Attributes) Equal(o *Attributes) bool {
 	if a == nil && o == nil {
 		return true
@@ -93,7 +92,7 @@ func (a *Attributes) Equal(o *Attributes) bool {
 			// o missing element of a
 			return false
 		}
-		if eq, ok := v.(interface{ Equal(o interface{}) bool }); ok {
+		if eq, ok := v.(interface{ Equal(o any) bool }); ok {
 			if !eq.Equal(ov) {
 				return false
 			}
@@ -112,19 +111,31 @@ func (a *Attributes) String() string {
 	sb.WriteString("{")
 	first := true
 	for k, v := range a.m {
-		var key, val string
-		if str, ok := k.(interface{ String() string }); ok {
-			key = str.String()
-		}
-		if str, ok := v.(interface{ String() string }); ok {
-			val = str.String()
-		}
 		if !first {
 			sb.WriteString(", ")
 		}
-		sb.WriteString(fmt.Sprintf("%q: %q, ", key, val))
+		sb.WriteString(fmt.Sprintf("%q: %q ", str(k), str(v)))
 		first = false
 	}
 	sb.WriteString("}")
 	return sb.String()
 }
+
+func str(x any) string {
+	if v, ok := x.(fmt.Stringer); ok {
+		return v.String()
+	} else if v, ok := x.(string); ok {
+		return v
+	}
+	return fmt.Sprintf("<%p>", x)
+}
+
+// MarshalJSON helps implement the json.Marshaler interface, thereby rendering
+// the Attributes correctly when printing (via pretty.JSON) structs containing
+// Attributes as fields.
+//
+// Is it impossible to unmarshal attributes from a JSON representation and this
+// method is meant only for debugging purposes.
+func (a *Attributes) MarshalJSON() ([]byte, error) {
+	return []byte(a.String()), nil
+}

vendor/google.golang.org/grpc/balancer/balancer.go

@@ -105,8 +105,8 @@ type SubConn interface {
 	//
 	// This will trigger a state transition for the SubConn.
 	//
-	// Deprecated: This method is now part of the ClientConn interface and will
-	// eventually be removed from here.
+	// Deprecated: this method will be removed.  Create new SubConns for new
+	// addresses instead.
 	UpdateAddresses([]resolver.Address)
 	// Connect starts the connecting for this SubConn.
 	Connect()
@@ -115,6 +115,13 @@ type SubConn interface {
 	// creates a new one and returns it.  Returns a close function which must
 	// be called when the Producer is no longer needed.
 	GetOrBuildProducer(ProducerBuilder) (p Producer, close func())
+	// Shutdown shuts down the SubConn gracefully.  Any started RPCs will be
+	// allowed to complete.  No future calls should be made on the SubConn.
+	// One final state update will be delivered to the StateListener (or
+	// UpdateSubConnState; deprecated) with ConnectivityState of Shutdown to
+	// indicate the shutdown operation.  This may be delivered before
+	// in-progress RPCs are complete and the actual connection is closed.
+	Shutdown()
 }
 
 // NewSubConnOptions contains options to create new SubConn.
@@ -129,6 +136,11 @@ type NewSubConnOptions struct {
 	// HealthCheckEnabled indicates whether health check service should be
 	// enabled on this SubConn
 	HealthCheckEnabled bool
+	// StateListener is called when the state of the subconn changes.  If nil,
+	// Balancer.UpdateSubConnState will be called instead.  Will never be
+	// invoked until after Connect() is called on the SubConn created with
+	// these options.
+	StateListener func(SubConnState)
 }
 
 // State contains the balancer's state relevant to the gRPC ClientConn.
@@ -150,16 +162,24 @@ type ClientConn interface {
 	// NewSubConn is called by balancer to create a new SubConn.
 	// It doesn't block and wait for the connections to be established.
 	// Behaviors of the SubConn can be controlled by options.
+	//
+	// Deprecated: please be aware that in a future version, SubConns will only
+	// support one address per SubConn.
 	NewSubConn([]resolver.Address, NewSubConnOptions) (SubConn, error)
 	// RemoveSubConn removes the SubConn from ClientConn.
 	// The SubConn will be shutdown.
+	//
+	// Deprecated: use SubConn.Shutdown instead.
 	RemoveSubConn(SubConn)
 	// UpdateAddresses updates the addresses used in the passed in SubConn.
 	// gRPC checks if the currently connected address is still in the new list.
 	// If so, the connection will be kept. Else, the connection will be
 	// gracefully closed, and a new connection will be created.
 	//
-	// This will trigger a state transition for the SubConn.
+	// This may trigger a state transition for the SubConn.
+	//
+	// Deprecated: this method will be removed.  Create new SubConns for new
+	// addresses instead.
 	UpdateAddresses(SubConn, []resolver.Address)
 
 	// UpdateState notifies gRPC that the balancer's internal state has
@@ -250,7 +270,7 @@ type DoneInfo struct {
 	// trailing metadata.
 	//
 	// The only supported type now is *orca_v3.LoadReport.
-	ServerLoad interface{}
+	ServerLoad any
 }
 
 var (
@@ -343,9 +363,13 @@ type Balancer interface {
 	ResolverError(error)
 	// UpdateSubConnState is called by gRPC when the state of a SubConn
 	// changes.
+	//
+	// Deprecated: Use NewSubConnOptions.StateListener when creating the
+	// SubConn instead.
 	UpdateSubConnState(SubConn, SubConnState)
-	// Close closes the balancer. The balancer is not required to call
-	// ClientConn.RemoveSubConn for its existing SubConns.
+	// Close closes the balancer. The balancer is not currently required to
+	// call SubConn.Shutdown for its existing SubConns; however, this will be
+	// required in a future release, so it is recommended.
 	Close()
 }
 
@@ -390,15 +414,14 @@ var ErrBadResolverState = errors.New("bad resolver state")
 type ProducerBuilder interface {
 	// Build creates a Producer.  The first parameter is always a
 	// grpc.ClientConnInterface (a type to allow creating RPCs/streams on the
-	// associated SubConn), but is declared as interface{} to avoid a
-	// dependency cycle.  Should also return a close function that will be
-	// called when all references to the Producer have been given up.
-	Build(grpcClientConnInterface interface{}) (p Producer, close func())
+	// associated SubConn), but is declared as `any` to avoid a dependency
+	// cycle.  Should also return a close function that will be called when all
+	// references to the Producer have been given up.
+	Build(grpcClientConnInterface any) (p Producer, close func())
 }
 
 // A Producer is a type shared among potentially many consumers.  It is
 // associated with a SubConn, and an implementation will typically contain
 // other methods to provide additional functionality, e.g. configuration or
 // subscription registration.
-type Producer interface {
-}
+type Producer any

vendor/google.golang.org/grpc/balancer/base/balancer.go

@@ -105,7 +105,12 @@ func (b *baseBalancer) UpdateClientConnState(s balancer.ClientConnState) error {
 		addrsSet.Set(a, nil)
 		if _, ok := b.subConns.Get(a); !ok {
 			// a is a new address (not existing in b.subConns).
-			sc, err := b.cc.NewSubConn([]resolver.Address{a}, balancer.NewSubConnOptions{HealthCheckEnabled: b.config.HealthCheck})
+			var sc balancer.SubConn
+			opts := balancer.NewSubConnOptions{
+				HealthCheckEnabled: b.config.HealthCheck,
+				StateListener:      func(scs balancer.SubConnState) { b.updateSubConnState(sc, scs) },
+			}
+			sc, err := b.cc.NewSubConn([]resolver.Address{a}, opts)
 			if err != nil {
 				logger.Warningf("base.baseBalancer: failed to create new SubConn: %v", err)
 				continue
@@ -121,10 +126,10 @@ func (b *baseBalancer) UpdateClientConnState(s balancer.ClientConnState) error {
 		sc := sci.(balancer.SubConn)
 		// a was removed by resolver.
 		if _, ok := addrsSet.Get(a); !ok {
-			b.cc.RemoveSubConn(sc)
+			sc.Shutdown()
 			b.subConns.Delete(a)
 			// Keep the state of this sc in b.scStates until sc's state becomes Shutdown.
-			// The entry will be deleted in UpdateSubConnState.
+			// The entry will be deleted in updateSubConnState.
 		}
 	}
 	// If resolver state contains no addresses, return an error so ClientConn
@@ -177,7 +182,12 @@ func (b *baseBalancer) regeneratePicker() {
 	b.picker = b.pickerBuilder.Build(PickerBuildInfo{ReadySCs: readySCs})
 }
 
+// UpdateSubConnState is a nop because a StateListener is always set in NewSubConn.
 func (b *baseBalancer) UpdateSubConnState(sc balancer.SubConn, state balancer.SubConnState) {
+	logger.Errorf("base.baseBalancer: UpdateSubConnState(%v, %+v) called unexpectedly", sc, state)
+}
+
+func (b *baseBalancer) updateSubConnState(sc balancer.SubConn, state balancer.SubConnState) {
 	s := state.ConnectivityState
 	if logger.V(2) {
 		logger.Infof("base.baseBalancer: handle SubConn state change: %p, %v", sc, s)
@@ -204,8 +214,8 @@ func (b *baseBalancer) UpdateSubConnState(sc balancer.SubConn, state balancer.Su
 	case connectivity.Idle:
 		sc.Connect()
 	case connectivity.Shutdown:
-		// When an address was removed by resolver, b called RemoveSubConn but
-		// kept the sc's state in scStates. Remove state for this sc here.
+		// When an address was removed by resolver, b called Shutdown but kept
+		// the sc's state in scStates. Remove state for this sc here.
 		delete(b.scStates, sc)
 	case connectivity.TransientFailure:
 		// Save error to be reported via picker.
@@ -226,7 +236,7 @@ func (b *baseBalancer) UpdateSubConnState(sc balancer.SubConn, state balancer.Su
 }
 
 // Close is a nop because base balancer doesn't have internal state to clean up,
-// and it doesn't need to call RemoveSubConn for the SubConns.
+// and it doesn't need to call Shutdown for the SubConns.
 func (b *baseBalancer) Close() {
 }
 

vendor/google.golang.org/grpc/balancer_conn_wrappers.go

@@ -99,20 +99,6 @@ func (ccb *ccBalancerWrapper) updateClientConnState(ccs *balancer.ClientConnStat
 	// lock held. But the lock guards only the scheduling part. The actual
 	// callback is called asynchronously without the lock being held.
 	ok := ccb.serializer.Schedule(func(_ context.Context) {
-		// If the addresses specified in the update contain addresses of type
-		// "grpclb" and the selected LB policy is not "grpclb", these addresses
-		// will be filtered out and ccs will be modified with the updated
-		// address list.
-		if ccb.curBalancerName != grpclbName {
-			var addrs []resolver.Address
-			for _, addr := range ccs.ResolverState.Addresses {
-				if addr.Type == resolver.GRPCLB {
-					continue
-				}
-				addrs = append(addrs, addr)
-			}
-			ccs.ResolverState.Addresses = addrs
-		}
 		errCh <- ccb.balancer.UpdateClientConnState(*ccs)
 	})
 	if !ok {
@@ -139,7 +125,9 @@ func (ccb *ccBalancerWrapper) updateClientConnState(ccs *balancer.ClientConnStat
 func (ccb *ccBalancerWrapper) updateSubConnState(sc balancer.SubConn, s connectivity.State, err error) {
 	ccb.mu.Lock()
 	ccb.serializer.Schedule(func(_ context.Context) {
-		ccb.balancer.UpdateSubConnState(sc, balancer.SubConnState{ConnectivityState: s, ConnectionError: err})
+		// Even though it is optional for balancers, gracefulswitch ensures
+		// opts.StateListener is set, so this cannot ever be nil.
+		sc.(*acBalancerWrapper).stateListener(balancer.SubConnState{ConnectivityState: s, ConnectionError: err})
 	})
 	ccb.mu.Unlock()
 }
@@ -221,7 +209,7 @@ func (ccb *ccBalancerWrapper) closeBalancer(m ccbMode) {
 	}
 
 	ccb.mode = m
-	done := ccb.serializer.Done
+	done := ccb.serializer.Done()
 	b := ccb.balancer
 	ok := ccb.serializer.Schedule(func(_ context.Context) {
 		// Close the serializer to ensure that no more calls from gRPC are sent
@@ -238,11 +226,9 @@ func (ccb *ccBalancerWrapper) closeBalancer(m ccbMode) {
 	}
 	ccb.mu.Unlock()
 
-	// Give enqueued callbacks a chance to finish.
+	// Give enqueued callbacks a chance to finish before closing the balancer.
 	<-done
-	// Spawn a goroutine to close the balancer (since it may block trying to
-	// cleanup all allocated resources) and return early.
-	go b.Close()
+	b.Close()
 }
 
 // exitIdleMode is invoked by grpc when the channel exits idle mode either
@@ -314,29 +300,19 @@ func (ccb *ccBalancerWrapper) NewSubConn(addrs []resolver.Address, opts balancer
 		channelz.Warningf(logger, ccb.cc.channelzID, "acBalancerWrapper: NewSubConn: failed to newAddrConn: %v", err)
 		return nil, err
 	}
-	acbw := &acBalancerWrapper{ac: ac, producers: make(map[balancer.ProducerBuilder]*refCountedProducer)}
+	acbw := &acBalancerWrapper{
+		ccb:           ccb,
+		ac:            ac,
+		producers:     make(map[balancer.ProducerBuilder]*refCountedProducer),
+		stateListener: opts.StateListener,
+	}
 	ac.acbw = acbw
 	return acbw, nil
 }
 
 func (ccb *ccBalancerWrapper) RemoveSubConn(sc balancer.SubConn) {
-	if ccb.isIdleOrClosed() {
-		// It it safe to ignore this call when the balancer is closed or in idle
-		// because the ClientConn takes care of closing the connections.
-		//
-		// Not returning early from here when the balancer is closed or in idle
-		// leads to a deadlock though, because of the following sequence of
-		// calls when holding cc.mu:
-		// cc.exitIdleMode --> ccb.enterIdleMode --> gsw.Close -->
-		// ccb.RemoveAddrConn --> cc.removeAddrConn
-		return
-	}
-
-	acbw, ok := sc.(*acBalancerWrapper)
-	if !ok {
-		return
-	}
-	ccb.cc.removeAddrConn(acbw.ac, errConnDrain)
+	// The graceful switch balancer will never call this.
+	logger.Errorf("ccb RemoveSubConn(%v) called unexpectedly, sc")
 }
 
 func (ccb *ccBalancerWrapper) UpdateAddresses(sc balancer.SubConn, addrs []resolver.Address) {
@@ -381,6 +357,8 @@ func (ccb *ccBalancerWrapper) Target() string {
 // It implements balancer.SubConn interface.
 type acBalancerWrapper struct {
 	ac            *addrConn          // read-only
+	ccb           *ccBalancerWrapper // read-only
+	stateListener func(balancer.SubConnState)
 
 	mu        sync.Mutex
 	producers map[balancer.ProducerBuilder]*refCountedProducer
@@ -398,6 +376,23 @@ func (acbw *acBalancerWrapper) Connect() {
 	go acbw.ac.connect()
 }
 
+func (acbw *acBalancerWrapper) Shutdown() {
+	ccb := acbw.ccb
+	if ccb.isIdleOrClosed() {
+		// It it safe to ignore this call when the balancer is closed or in idle
+		// because the ClientConn takes care of closing the connections.
+		//
+		// Not returning early from here when the balancer is closed or in idle
+		// leads to a deadlock though, because of the following sequence of
+		// calls when holding cc.mu:
+		// cc.exitIdleMode --> ccb.enterIdleMode --> gsw.Close -->
+		// ccb.RemoveAddrConn --> cc.removeAddrConn
+		return
+	}
+
+	ccb.cc.removeAddrConn(acbw.ac, errConnDrain)
+}
+
 // NewStream begins a streaming RPC on the addrConn.  If the addrConn is not
 // ready, blocks until it is or ctx expires.  Returns an error when the context
 // expires or the addrConn is shut down.
@@ -411,7 +406,7 @@ func (acbw *acBalancerWrapper) NewStream(ctx context.Context, desc *StreamDesc,
 
 // Invoke performs a unary RPC.  If the addrConn is not ready, returns
 // errSubConnNotReady.
-func (acbw *acBalancerWrapper) Invoke(ctx context.Context, method string, args interface{}, reply interface{}, opts ...CallOption) error {
+func (acbw *acBalancerWrapper) Invoke(ctx context.Context, method string, args any, reply any, opts ...CallOption) error {
 	cs, err := acbw.NewStream(ctx, unaryStreamDesc, method, opts...)
 	if err != nil {
 		return err

vendor/google.golang.org/grpc/binarylog/grpc_binarylog_v1/binarylog.pb.go

@@ -18,7 +18,7 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.31.0
 // 	protoc        v4.22.0
 // source: grpc/binlog/v1/binarylog.proto
 

vendor/google.golang.org/grpc/call.go

@@ -26,12 +26,7 @@ import (
 // received.  This is typically called by generated code.
 //
 // All errors returned by Invoke are compatible with the status package.
-func (cc *ClientConn) Invoke(ctx context.Context, method string, args, reply interface{}, opts ...CallOption) error {
-	if err := cc.idlenessMgr.onCallBegin(); err != nil {
-		return err
-	}
-	defer cc.idlenessMgr.onCallEnd()
-
+func (cc *ClientConn) Invoke(ctx context.Context, method string, args, reply any, opts ...CallOption) error {
 	// allow interceptor to see all applicable call options, which means those
 	// configured as defaults from dial option as well as per-call options
 	opts = combine(cc.dopts.callOptions, opts)
@@ -61,13 +56,13 @@ func combine(o1 []CallOption, o2 []CallOption) []CallOption {
 // received.  This is typically called by generated code.
 //
 // DEPRECATED: Use ClientConn.Invoke instead.
-func Invoke(ctx context.Context, method string, args, reply interface{}, cc *ClientConn, opts ...CallOption) error {
+func Invoke(ctx context.Context, method string, args, reply any, cc *ClientConn, opts ...CallOption) error {
 	return cc.Invoke(ctx, method, args, reply, opts...)
 }
 
 var unaryStreamDesc = &StreamDesc{ServerStreams: false, ClientStreams: false}
 
-func invoke(ctx context.Context, method string, req, reply interface{}, cc *ClientConn, opts ...CallOption) error {
+func invoke(ctx context.Context, method string, req, reply any, cc *ClientConn, opts ...CallOption) error {
 	cs, err := newClientStream(ctx, unaryStreamDesc, cc, method, opts...)
 	if err != nil {
 		return err

vendor/google.golang.org/grpc/clientconn.go

@@ -34,9 +34,12 @@ import (
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/connectivity"
 	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/internal"
 	"google.golang.org/grpc/internal/backoff"
 	"google.golang.org/grpc/internal/channelz"
 	"google.golang.org/grpc/internal/grpcsync"
+	"google.golang.org/grpc/internal/idle"
+	"google.golang.org/grpc/internal/pretty"
 	iresolver "google.golang.org/grpc/internal/resolver"
 	"google.golang.org/grpc/internal/transport"
 	"google.golang.org/grpc/keepalive"
@@ -53,8 +56,6 @@ import (
 const (
 	// minimum time to give a connection to complete
 	minConnectTimeout = 20 * time.Second
-	// must match grpclbName in grpclb/grpclb.go
-	grpclbName = "grpclb"
 )
 
 var (
@@ -137,7 +138,6 @@ func (dcs *defaultConfigSelector) SelectConfig(rpcInfo iresolver.RPCInfo) (*ires
 func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *ClientConn, err error) {
 	cc := &ClientConn{
 		target: target,
-		csMgr:  &connectivityStateManager{},
 		conns:  make(map[*addrConn]struct{}),
 		dopts:  defaultDialOptions(),
 		czData: new(channelzData),
@@ -190,6 +190,8 @@ func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *
 	// Register ClientConn with channelz.
 	cc.channelzRegistration(target)
 
+	cc.csMgr = newConnectivityStateManager(cc.ctx, cc.channelzID)
+
 	if err := cc.validateTransportCredentials(); err != nil {
 		return nil, err
 	}
@@ -265,7 +267,7 @@ func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *
 	// Configure idleness support with configured idle timeout or default idle
 	// timeout duration. Idleness can be explicitly disabled by the user, by
 	// setting the dial option to 0.
-	cc.idlenessMgr = newIdlenessManager(cc, cc.dopts.idleTimeout)
+	cc.idlenessMgr = idle.NewManager(idle.ManagerOptions{Enforcer: (*idler)(cc), Timeout: cc.dopts.idleTimeout, Logger: logger})
 
 	// Return early for non-blocking dials.
 	if !cc.dopts.block {
@@ -316,6 +318,16 @@ func (cc *ClientConn) addTraceEvent(msg string) {
 	channelz.AddTraceEvent(logger, cc.channelzID, 0, ted)
 }
 
+type idler ClientConn
+
+func (i *idler) EnterIdleMode() error {
+	return (*ClientConn)(i).enterIdleMode()
+}
+
+func (i *idler) ExitIdleMode() error {
+	return (*ClientConn)(i).exitIdleMode()
+}
+
 // exitIdleMode moves the channel out of idle mode by recreating the name
 // resolver and load balancer.
 func (cc *ClientConn) exitIdleMode() error {
@@ -326,7 +338,7 @@ func (cc *ClientConn) exitIdleMode() error {
 	}
 	if cc.idlenessState != ccIdlenessStateIdle {
 		cc.mu.Unlock()
-		logger.Info("ClientConn asked to exit idle mode when not in idle mode")
+		channelz.Infof(logger, cc.channelzID, "ClientConn asked to exit idle mode, current mode is %v", cc.idlenessState)
 		return nil
 	}
 
@@ -349,7 +361,7 @@ func (cc *ClientConn) exitIdleMode() error {
 	cc.idlenessState = ccIdlenessStateExitingIdle
 	exitedIdle := false
 	if cc.blockingpicker == nil {
-		cc.blockingpicker = newPickerWrapper()
+		cc.blockingpicker = newPickerWrapper(cc.dopts.copts.StatsHandlers)
 	} else {
 		cc.blockingpicker.exitIdleMode()
 		exitedIdle = true
@@ -397,7 +409,8 @@ func (cc *ClientConn) enterIdleMode() error {
 		return ErrClientConnClosing
 	}
 	if cc.idlenessState != ccIdlenessStateActive {
-		logger.Error("ClientConn asked to enter idle mode when not active")
+		channelz.Errorf(logger, cc.channelzID, "ClientConn asked to enter idle mode, current mode is %v", cc.idlenessState)
+		cc.mu.Unlock()
 		return nil
 	}
 
@@ -474,7 +487,6 @@ func (cc *ClientConn) validateTransportCredentials() error {
 func (cc *ClientConn) channelzRegistration(target string) {
 	cc.channelzID = channelz.RegisterChannel(&channelzChannel{cc}, cc.dopts.channelzParentID, target)
 	cc.addTraceEvent("created")
-	cc.csMgr.channelzID = cc.channelzID
 }
 
 // chainUnaryClientInterceptors chains all unary client interceptors into one.
@@ -491,7 +503,7 @@ func chainUnaryClientInterceptors(cc *ClientConn) {
 	} else if len(interceptors) == 1 {
 		chainedInt = interceptors[0]
 	} else {
-		chainedInt = func(ctx context.Context, method string, req, reply interface{}, cc *ClientConn, invoker UnaryInvoker, opts ...CallOption) error {
+		chainedInt = func(ctx context.Context, method string, req, reply any, cc *ClientConn, invoker UnaryInvoker, opts ...CallOption) error {
 			return interceptors[0](ctx, method, req, reply, cc, getChainUnaryInvoker(interceptors, 0, invoker), opts...)
 		}
 	}
@@ -503,7 +515,7 @@ func getChainUnaryInvoker(interceptors []UnaryClientInterceptor, curr int, final
 	if curr == len(interceptors)-1 {
 		return finalInvoker
 	}
-	return func(ctx context.Context, method string, req, reply interface{}, cc *ClientConn, opts ...CallOption) error {
+	return func(ctx context.Context, method string, req, reply any, cc *ClientConn, opts ...CallOption) error {
 		return interceptors[curr+1](ctx, method, req, reply, cc, getChainUnaryInvoker(interceptors, curr+1, finalInvoker), opts...)
 	}
 }
@@ -539,13 +551,27 @@ func getChainStreamer(interceptors []StreamClientInterceptor, curr int, finalStr
 	}
 }
 
+// newConnectivityStateManager creates an connectivityStateManager with
+// the specified id.
+func newConnectivityStateManager(ctx context.Context, id *channelz.Identifier) *connectivityStateManager {
+	return &connectivityStateManager{
+		channelzID: id,
+		pubSub:     grpcsync.NewPubSub(ctx),
+	}
+}
+
 // connectivityStateManager keeps the connectivity.State of ClientConn.
 // This struct will eventually be exported so the balancers can access it.
+//
+// TODO: If possible, get rid of the `connectivityStateManager` type, and
+// provide this functionality using the `PubSub`, to avoid keeping track of
+// the connectivity state at two places.
 type connectivityStateManager struct {
 	mu         sync.Mutex
 	state      connectivity.State
 	notifyChan chan struct{}
 	channelzID *channelz.Identifier
+	pubSub     *grpcsync.PubSub
 }
 
 // updateState updates the connectivity.State of ClientConn.
@@ -561,6 +587,8 @@ func (csm *connectivityStateManager) updateState(state connectivity.State) {
 		return
 	}
 	csm.state = state
+	csm.pubSub.Publish(state)
+
 	channelz.Infof(logger, csm.channelzID, "Channel Connectivity change to %v", state)
 	if csm.notifyChan != nil {
 		// There are other goroutines waiting on this channel.
@@ -590,7 +618,7 @@ func (csm *connectivityStateManager) getNotifyChan() <-chan struct{} {
 type ClientConnInterface interface {
 	// Invoke performs a unary RPC and returns after the response is received
 	// into reply.
-	Invoke(ctx context.Context, method string, args interface{}, reply interface{}, opts ...CallOption) error
+	Invoke(ctx context.Context, method string, args any, reply any, opts ...CallOption) error
 	// NewStream begins a streaming RPC.
 	NewStream(ctx context.Context, desc *StreamDesc, method string, opts ...CallOption) (ClientStream, error)
 }
@@ -622,7 +650,7 @@ type ClientConn struct {
 	channelzID      *channelz.Identifier // Channelz identifier for the channel.
 	resolverBuilder resolver.Builder     // See parseTargetAndFindResolver().
 	balancerWrapper *ccBalancerWrapper   // Uses gracefulswitch.balancer underneath.
-	idlenessMgr     idlenessManager
+	idlenessMgr     idle.Manager
 
 	// The following provide their own synchronization, and therefore don't
 	// require cc.mu to be held to access them.
@@ -668,6 +696,19 @@ const (
 	ccIdlenessStateExitingIdle
 )
 
+func (s ccIdlenessState) String() string {
+	switch s {
+	case ccIdlenessStateActive:
+		return "active"
+	case ccIdlenessStateIdle:
+		return "idle"
+	case ccIdlenessStateExitingIdle:
+		return "exitingIdle"
+	default:
+		return "unknown"
+	}
+}
+
 // WaitForStateChange waits until the connectivity.State of ClientConn changes from sourceState or
 // ctx expires. A true value is returned in former case and false in latter.
 //
@@ -759,6 +800,10 @@ func init() {
 		panic(fmt.Sprintf("impossible error parsing empty service config: %v", cfg.Err))
 	}
 	emptyServiceConfig = cfg.Config.(*ServiceConfig)
+
+	internal.SubscribeToConnectivityStateChanges = func(cc *ClientConn, s grpcsync.Subscriber) func() {
+		return cc.csMgr.pubSub.Subscribe(s)
+	}
 }
 
 func (cc *ClientConn) maybeApplyDefaultServiceConfig(addrs []resolver.Address) {
@@ -867,6 +912,20 @@ func (cc *ClientConn) handleSubConnStateChange(sc balancer.SubConn, s connectivi
 	cc.balancerWrapper.updateSubConnState(sc, s, err)
 }
 
+// Makes a copy of the input addresses slice and clears out the balancer
+// attributes field. Addresses are passed during subconn creation and address
+// update operations. In both cases, we will clear the balancer attributes by
+// calling this function, and therefore we will be able to use the Equal method
+// provided by the resolver.Address type for comparison.
+func copyAddressesWithoutBalancerAttributes(in []resolver.Address) []resolver.Address {
+	out := make([]resolver.Address, len(in))
+	for i := range in {
+		out[i] = in[i]
+		out[i].BalancerAttributes = nil
+	}
+	return out
+}
+
 // newAddrConn creates an addrConn for addrs and adds it to cc.conns.
 //
 // Caller needs to make sure len(addrs) > 0.
@@ -874,7 +933,7 @@ func (cc *ClientConn) newAddrConn(addrs []resolver.Address, opts balancer.NewSub
 	ac := &addrConn{
 		state:        connectivity.Idle,
 		cc:           cc,
-		addrs:        addrs,
+		addrs:        copyAddressesWithoutBalancerAttributes(addrs),
 		scopts:       opts,
 		dopts:        cc.dopts,
 		czData:       new(channelzData),
@@ -995,8 +1054,9 @@ func equalAddresses(a, b []resolver.Address) bool {
 // connections or connection attempts.
 func (ac *addrConn) updateAddrs(addrs []resolver.Address) {
 	ac.mu.Lock()
-	channelz.Infof(logger, ac.channelzID, "addrConn: updateAddrs curAddr: %v, addrs: %v", ac.curAddr, addrs)
+	channelz.Infof(logger, ac.channelzID, "addrConn: updateAddrs curAddr: %v, addrs: %v", pretty.ToJSON(ac.curAddr), pretty.ToJSON(addrs))
 
+	addrs = copyAddressesWithoutBalancerAttributes(addrs)
 	if equalAddresses(ac.addrs, addrs) {
 		ac.mu.Unlock()
 		return
@@ -1031,8 +1091,8 @@ func (ac *addrConn) updateAddrs(addrs []resolver.Address) {
 	ac.cancel()
 	ac.ctx, ac.cancel = context.WithCancel(ac.cc.ctx)
 
-	// We have to defer here because GracefulClose => Close => onClose, which
-	// requires locking ac.mu.
+	// We have to defer here because GracefulClose => onClose, which requires
+	// locking ac.mu.
 	if ac.transport != nil {
 		defer ac.transport.GracefulClose()
 		ac.transport = nil
@@ -1137,23 +1197,13 @@ func (cc *ClientConn) applyServiceConfigAndBalancer(sc *ServiceConfig, configSel
 	}
 
 	var newBalancerName string
-	if cc.sc != nil && cc.sc.lbConfig != nil {
-		newBalancerName = cc.sc.lbConfig.name
-	} else {
-		var isGRPCLB bool
-		for _, a := range addrs {
-			if a.Type == resolver.GRPCLB {
-				isGRPCLB = true
-				break
-			}
-		}
-		if isGRPCLB {
-			newBalancerName = grpclbName
-		} else if cc.sc != nil && cc.sc.LB != nil {
-			newBalancerName = *cc.sc.LB
-		} else {
+	if cc.sc == nil || (cc.sc.lbConfig == nil && cc.sc.LB == nil) {
+		// No service config or no LB policy specified in config.
 		newBalancerName = PickFirstBalancerName
-		}
+	} else if cc.sc.lbConfig != nil {
+		newBalancerName = cc.sc.lbConfig.name
+	} else { // cc.sc.LB != nil
+		newBalancerName = *cc.sc.LB
 	}
 	cc.balancerWrapper.switchTo(newBalancerName)
 }
@@ -1192,7 +1242,10 @@ func (cc *ClientConn) ResetConnectBackoff() {
 
 // Close tears down the ClientConn and all underlying connections.
 func (cc *ClientConn) Close() error {
-	defer cc.cancel()
+	defer func() {
+		cc.cancel()
+		<-cc.csMgr.pubSub.Done()
+	}()
 
 	cc.mu.Lock()
 	if cc.conns == nil {
@@ -1226,7 +1279,7 @@ func (cc *ClientConn) Close() error {
 		rWrapper.close()
 	}
 	if idlenessMgr != nil {
-		idlenessMgr.close()
+		idlenessMgr.Close()
 	}
 
 	for ac := range conns {
@@ -1336,12 +1389,14 @@ func (ac *addrConn) resetTransport() {
 
 	if err := ac.tryAllAddrs(acCtx, addrs, connectDeadline); err != nil {
 		ac.cc.resolveNow(resolver.ResolveNowOptions{})
-		// After exhausting all addresses, the addrConn enters
-		// TRANSIENT_FAILURE.
+		ac.mu.Lock()
 		if acCtx.Err() != nil {
+			// addrConn was torn down.
+			ac.mu.Unlock()
 			return
 		}
-		ac.mu.Lock()
+		// After exhausting all addresses, the addrConn enters
+		// TRANSIENT_FAILURE.
 		ac.updateConnectivityState(connectivity.TransientFailure, err)
 
 		// Backoff.
@@ -1537,7 +1592,7 @@ func (ac *addrConn) startHealthCheck(ctx context.Context) {
 
 	// Set up the health check helper functions.
 	currentTr := ac.transport
-	newStream := func(method string) (interface{}, error) {
+	newStream := func(method string) (any, error) {
 		ac.mu.Lock()
 		if ac.transport != currentTr {
 			ac.mu.Unlock()
@@ -1625,16 +1680,7 @@ func (ac *addrConn) tearDown(err error) {
 	ac.updateConnectivityState(connectivity.Shutdown, nil)
 	ac.cancel()
 	ac.curAddr = resolver.Address{}
-	if err == errConnDrain && curTr != nil {
-		// GracefulClose(...) may be executed multiple times when
-		// i) receiving multiple GoAway frames from the server; or
-		// ii) there are concurrent name resolver/Balancer triggered
-		// address removal and GoAway.
-		// We have to unlock and re-lock here because GracefulClose => Close => onClose, which requires locking ac.mu.
-		ac.mu.Unlock()
-		curTr.GracefulClose()
-		ac.mu.Lock()
-	}
+
 	channelz.AddTraceEvent(logger, ac.channelzID, 0, &channelz.TraceEventDesc{
 		Desc:     "Subchannel deleted",
 		Severity: channelz.CtInfo,
@@ -1648,6 +1694,29 @@ func (ac *addrConn) tearDown(err error) {
 	// being deleted right away.
 	channelz.RemoveEntry(ac.channelzID)
 	ac.mu.Unlock()
+
+	// We have to release the lock before the call to GracefulClose/Close here
+	// because both of them call onClose(), which requires locking ac.mu.
+	if curTr != nil {
+		if err == errConnDrain {
+			// Close the transport gracefully when the subConn is being shutdown.
+			//
+			// GracefulClose() may be executed multiple times if:
+			// - multiple GoAway frames are received from the server
+			// - there are concurrent name resolver or balancer triggered
+			//   address removal and GoAway
+			curTr.GracefulClose()
+		} else {
+			// Hard close the transport when the channel is entering idle or is
+			// being shutdown. In the case where the channel is being shutdown,
+			// closing of transports is also taken care of by cancelation of cc.ctx.
+			// But in the case where the channel is entering idle, we need to
+			// explicitly close the transports here. Instead of distinguishing
+			// between these two cases, it is simpler to close the transport
+			// unconditionally here.
+			curTr.Close(err)
+		}
+	}
 }
 
 func (ac *addrConn) getState() connectivity.State {
@@ -1807,19 +1876,70 @@ func (cc *ClientConn) parseTargetAndFindResolver() error {
 }
 
 // parseTarget uses RFC 3986 semantics to parse the given target into a
-// resolver.Target struct containing scheme, authority and url. Query
-// params are stripped from the endpoint.
+// resolver.Target struct containing url. Query params are stripped from the
+// endpoint.
 func parseTarget(target string) (resolver.Target, error) {
 	u, err := url.Parse(target)
 	if err != nil {
 		return resolver.Target{}, err
 	}
 
-	return resolver.Target{
-		Scheme:    u.Scheme,
-		Authority: u.Host,
-		URL:       *u,
-	}, nil
+	return resolver.Target{URL: *u}, nil
+}
+
+func encodeAuthority(authority string) string {
+	const upperhex = "0123456789ABCDEF"
+
+	// Return for characters that must be escaped as per
+	// Valid chars are mentioned here:
+	// https://datatracker.ietf.org/doc/html/rfc3986#section-3.2
+	shouldEscape := func(c byte) bool {
+		// Alphanum are always allowed.
+		if 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z' || '0' <= c && c <= '9' {
+			return false
+		}
+		switch c {
+		case '-', '_', '.', '~': // Unreserved characters
+			return false
+		case '!', '$', '&', '\'', '(', ')', '*', '+', ',', ';', '=': // Subdelim characters
+			return false
+		case ':', '[', ']', '@': // Authority related delimeters
+			return false
+		}
+		// Everything else must be escaped.
+		return true
+	}
+
+	hexCount := 0
+	for i := 0; i < len(authority); i++ {
+		c := authority[i]
+		if shouldEscape(c) {
+			hexCount++
+		}
+	}
+
+	if hexCount == 0 {
+		return authority
+	}
+
+	required := len(authority) + 2*hexCount
+	t := make([]byte, required)
+
+	j := 0
+	// This logic is a barebones version of escape in the go net/url library.
+	for i := 0; i < len(authority); i++ {
+		switch c := authority[i]; {
+		case shouldEscape(c):
+			t[j] = '%'
+			t[j+1] = upperhex[c>>4]
+			t[j+2] = upperhex[c&15]
+			j += 3
+		default:
+			t[j] = authority[i]
+			j++
+		}
+	}
+	return string(t)
 }
 
 // Determine channel authority. The order of precedence is as follows:
@@ -1872,7 +1992,11 @@ func (cc *ClientConn) determineAuthority() error {
 		// the channel authority given the user's dial target. For resolvers
 		// which don't implement this interface, we will use the endpoint from
 		// "scheme://authority/endpoint" as the default authority.
-		cc.authority = endpoint
+		// Escape the endpoint to handle use cases where the endpoint
+		// might not be a valid authority by default.
+		// For example an endpoint which has multiple paths like
+		// 'a/b/c', which is not a valid authority by default.
+		cc.authority = encodeAuthority(endpoint)
 	}
 	channelz.Infof(logger, cc.channelzID, "Channel authority set to %q", cc.authority)
 	return nil

vendor/google.golang.org/grpc/codec.go

@@ -27,8 +27,8 @@ import (
 // omits the name/string, which vary between the two and are not needed for
 // anything besides the registry in the encoding package.
 type baseCodec interface {
-	Marshal(v interface{}) ([]byte, error)
-	Unmarshal(data []byte, v interface{}) error
+	Marshal(v any) ([]byte, error)
+	Unmarshal(data []byte, v any) error
 }
 
 var _ baseCodec = Codec(nil)
@@ -41,9 +41,9 @@ var _ baseCodec = encoding.Codec(nil)
 // Deprecated: use encoding.Codec instead.
 type Codec interface {
 	// Marshal returns the wire format of v.
-	Marshal(v interface{}) ([]byte, error)
+	Marshal(v any) ([]byte, error)
 	// Unmarshal parses the wire format into v.
-	Unmarshal(data []byte, v interface{}) error
+	Unmarshal(data []byte, v any) error
 	// String returns the name of the Codec implementation.  This is unused by
 	// gRPC.
 	String() string

vendor/google.golang.org/grpc/dialoptions.go

@@ -78,6 +78,7 @@ type dialOptions struct {
 	defaultServiceConfigRawJSON *string
 	resolvers                   []resolver.Builder
 	idleTimeout                 time.Duration
+	recvBufferPool              SharedBufferPool
 }
 
 // DialOption configures how we set up the connection.
@@ -138,6 +139,20 @@ func newJoinDialOption(opts ...DialOption) DialOption {
 	return &joinDialOption{opts: opts}
 }
 
+// WithSharedWriteBuffer allows reusing per-connection transport write buffer.
+// If this option is set to true every connection will release the buffer after
+// flushing the data on the wire.
+//
+// # Experimental
+//
+// Notice: This API is EXPERIMENTAL and may be changed or removed in a
+// later release.
+func WithSharedWriteBuffer(val bool) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.copts.SharedWriteBuffer = val
+	})
+}
+
 // WithWriteBufferSize determines how much data can be batched before doing a
 // write on the wire. The corresponding memory allocation for this buffer will
 // be twice the size to keep syscalls low. The default value for this buffer is
@@ -628,6 +643,7 @@ func defaultDialOptions() dialOptions {
 			ReadBufferSize:  defaultReadBufSize,
 			UseProxy:        true,
 		},
+		recvBufferPool: nopBufferPool{},
 	}
 }
 
@@ -676,3 +692,24 @@ func WithIdleTimeout(d time.Duration) DialOption {
 		o.idleTimeout = d
 	})
 }
+
+// WithRecvBufferPool returns a DialOption that configures the ClientConn
+// to use the provided shared buffer pool for parsing incoming messages. Depending
+// on the application's workload, this could result in reduced memory allocation.
+//
+// If you are unsure about how to implement a memory pool but want to utilize one,
+// begin with grpc.NewSharedBufferPool.
+//
+// Note: The shared buffer pool feature will not be active if any of the following
+// options are used: WithStatsHandler, EnableTracing, or binary logging. In such
+// cases, the shared buffer pool will be ignored.
+//
+// # Experimental
+//
+// Notice: This API is EXPERIMENTAL and may be changed or removed in a
+// later release.
+func WithRecvBufferPool(bufferPool SharedBufferPool) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.recvBufferPool = bufferPool
+	})
+}

vendor/google.golang.org/grpc/encoding/encoding.go

@@ -90,9 +90,9 @@ func GetCompressor(name string) Compressor {
 // methods can be called from concurrent goroutines.
 type Codec interface {
 	// Marshal returns the wire format of v.
-	Marshal(v interface{}) ([]byte, error)
+	Marshal(v any) ([]byte, error)
 	// Unmarshal parses the wire format into v.
-	Unmarshal(data []byte, v interface{}) error
+	Unmarshal(data []byte, v any) error
 	// Name returns the name of the Codec implementation. The returned string
 	// will be used as part of content type in transmission.  The result must be
 	// static; the result cannot change between calls.

vendor/google.golang.org/grpc/encoding/proto/proto.go

@@ -37,7 +37,7 @@ func init() {
 // codec is a Codec implementation with protobuf. It is the default codec for gRPC.
 type codec struct{}
 
-func (codec) Marshal(v interface{}) ([]byte, error) {
+func (codec) Marshal(v any) ([]byte, error) {
 	vv, ok := v.(proto.Message)
 	if !ok {
 		return nil, fmt.Errorf("failed to marshal, message is %T, want proto.Message", v)
@@ -45,7 +45,7 @@ func (codec) Marshal(v interface{}) ([]byte, error) {
 	return proto.Marshal(vv)
 }
 
-func (codec) Unmarshal(data []byte, v interface{}) error {
+func (codec) Unmarshal(data []byte, v any) error {
 	vv, ok := v.(proto.Message)
 	if !ok {
 		return fmt.Errorf("failed to unmarshal, message is %T, want proto.Message", v)

vendor/google.golang.org/grpc/grpclog/component.go

@@ -31,71 +31,71 @@ type componentData struct {
 
 var cache = map[string]*componentData{}
 
-func (c *componentData) InfoDepth(depth int, args ...interface{}) {
-	args = append([]interface{}{"[" + string(c.name) + "]"}, args...)
+func (c *componentData) InfoDepth(depth int, args ...any) {
+	args = append([]any{"[" + string(c.name) + "]"}, args...)
 	grpclog.InfoDepth(depth+1, args...)
 }
 
-func (c *componentData) WarningDepth(depth int, args ...interface{}) {
-	args = append([]interface{}{"[" + string(c.name) + "]"}, args...)
+func (c *componentData) WarningDepth(depth int, args ...any) {
+	args = append([]any{"[" + string(c.name) + "]"}, args...)
 	grpclog.WarningDepth(depth+1, args...)
 }
 
-func (c *componentData) ErrorDepth(depth int, args ...interface{}) {
-	args = append([]interface{}{"[" + string(c.name) + "]"}, args...)
+func (c *componentData) ErrorDepth(depth int, args ...any) {
+	args = append([]any{"[" + string(c.name) + "]"}, args...)
 	grpclog.ErrorDepth(depth+1, args...)
 }
 
-func (c *componentData) FatalDepth(depth int, args ...interface{}) {
-	args = append([]interface{}{"[" + string(c.name) + "]"}, args...)
+func (c *componentData) FatalDepth(depth int, args ...any) {
+	args = append([]any{"[" + string(c.name) + "]"}, args...)
 	grpclog.FatalDepth(depth+1, args...)
 }
 
-func (c *componentData) Info(args ...interface{}) {
+func (c *componentData) Info(args ...any) {
 	c.InfoDepth(1, args...)
 }
 
-func (c *componentData) Warning(args ...interface{}) {
+func (c *componentData) Warning(args ...any) {
 	c.WarningDepth(1, args...)
 }
 
-func (c *componentData) Error(args ...interface{}) {
+func (c *componentData) Error(args ...any) {
 	c.ErrorDepth(1, args...)
 }
 
-func (c *componentData) Fatal(args ...interface{}) {
+func (c *componentData) Fatal(args ...any) {
 	c.FatalDepth(1, args...)
 }
 
-func (c *componentData) Infof(format string, args ...interface{}) {
+func (c *componentData) Infof(format string, args ...any) {
 	c.InfoDepth(1, fmt.Sprintf(format, args...))
 }
 
-func (c *componentData) Warningf(format string, args ...interface{}) {
+func (c *componentData) Warningf(format string, args ...any) {
 	c.WarningDepth(1, fmt.Sprintf(format, args...))
 }
 
-func (c *componentData) Errorf(format string, args ...interface{}) {
+func (c *componentData) Errorf(format string, args ...any) {
 	c.ErrorDepth(1, fmt.Sprintf(format, args...))
 }
 
-func (c *componentData) Fatalf(format string, args ...interface{}) {
+func (c *componentData) Fatalf(format string, args ...any) {
 	c.FatalDepth(1, fmt.Sprintf(format, args...))
 }
 
-func (c *componentData) Infoln(args ...interface{}) {
+func (c *componentData) Infoln(args ...any) {
 	c.InfoDepth(1, args...)
 }
 
-func (c *componentData) Warningln(args ...interface{}) {
+func (c *componentData) Warningln(args ...any) {
 	c.WarningDepth(1, args...)
 }
 
-func (c *componentData) Errorln(args ...interface{}) {
+func (c *componentData) Errorln(args ...any) {
 	c.ErrorDepth(1, args...)
 }
 
-func (c *componentData) Fatalln(args ...interface{}) {
+func (c *componentData) Fatalln(args ...any) {
 	c.FatalDepth(1, args...)
 }
 

vendor/google.golang.org/grpc/grpclog/grpclog.go

@@ -42,53 +42,53 @@ func V(l int) bool {
 }
 
 // Info logs to the INFO log.
-func Info(args ...interface{}) {
+func Info(args ...any) {
 	grpclog.Logger.Info(args...)
 }
 
 // Infof logs to the INFO log. Arguments are handled in the manner of fmt.Printf.
-func Infof(format string, args ...interface{}) {
+func Infof(format string, args ...any) {
 	grpclog.Logger.Infof(format, args...)
 }
 
 // Infoln logs to the INFO log. Arguments are handled in the manner of fmt.Println.
-func Infoln(args ...interface{}) {
+func Infoln(args ...any) {
 	grpclog.Logger.Infoln(args...)
 }
 
 // Warning logs to the WARNING log.
-func Warning(args ...interface{}) {
+func Warning(args ...any) {
 	grpclog.Logger.Warning(args...)
 }
 
 // Warningf logs to the WARNING log. Arguments are handled in the manner of fmt.Printf.
-func Warningf(format string, args ...interface{}) {
+func Warningf(format string, args ...any) {
 	grpclog.Logger.Warningf(format, args...)
 }
 
 // Warningln logs to the WARNING log. Arguments are handled in the manner of fmt.Println.
-func Warningln(args ...interface{}) {
+func Warningln(args ...any) {
 	grpclog.Logger.Warningln(args...)
 }
 
 // Error logs to the ERROR log.
-func Error(args ...interface{}) {
+func Error(args ...any) {
 	grpclog.Logger.Error(args...)
 }
 
 // Errorf logs to the ERROR log. Arguments are handled in the manner of fmt.Printf.
-func Errorf(format string, args ...interface{}) {
+func Errorf(format string, args ...any) {
 	grpclog.Logger.Errorf(format, args...)
 }
 
 // Errorln logs to the ERROR log. Arguments are handled in the manner of fmt.Println.
-func Errorln(args ...interface{}) {
+func Errorln(args ...any) {
 	grpclog.Logger.Errorln(args...)
 }
 
 // Fatal logs to the FATAL log. Arguments are handled in the manner of fmt.Print.
 // It calls os.Exit() with exit code 1.
-func Fatal(args ...interface{}) {
+func Fatal(args ...any) {
 	grpclog.Logger.Fatal(args...)
 	// Make sure fatal logs will exit.
 	os.Exit(1)
@@ -96,7 +96,7 @@ func Fatal(args ...interface{}) {
 
 // Fatalf logs to the FATAL log. Arguments are handled in the manner of fmt.Printf.
 // It calls os.Exit() with exit code 1.
-func Fatalf(format string, args ...interface{}) {
+func Fatalf(format string, args ...any) {
 	grpclog.Logger.Fatalf(format, args...)
 	// Make sure fatal logs will exit.
 	os.Exit(1)
@@ -104,7 +104,7 @@ func Fatalf(format string, args ...interface{}) {
 
 // Fatalln logs to the FATAL log. Arguments are handled in the manner of fmt.Println.
 // It calle os.Exit()) with exit code 1.
-func Fatalln(args ...interface{}) {
+func Fatalln(args ...any) {
 	grpclog.Logger.Fatalln(args...)
 	// Make sure fatal logs will exit.
 	os.Exit(1)
@@ -113,20 +113,20 @@ func Fatalln(args ...interface{}) {
 // Print prints to the logger. Arguments are handled in the manner of fmt.Print.
 //
 // Deprecated: use Info.
-func Print(args ...interface{}) {
+func Print(args ...any) {
 	grpclog.Logger.Info(args...)
 }
 
 // Printf prints to the logger. Arguments are handled in the manner of fmt.Printf.
 //
 // Deprecated: use Infof.
-func Printf(format string, args ...interface{}) {
+func Printf(format string, args ...any) {
 	grpclog.Logger.Infof(format, args...)
 }
 
 // Println prints to the logger. Arguments are handled in the manner of fmt.Println.
 //
 // Deprecated: use Infoln.
-func Println(args ...interface{}) {
+func Println(args ...any) {
 	grpclog.Logger.Infoln(args...)
 }

vendor/google.golang.org/grpc/grpclog/logger.go

@@ -24,12 +24,12 @@ import "google.golang.org/grpc/internal/grpclog"
 //
 // Deprecated: use LoggerV2.
 type Logger interface {
-	Fatal(args ...interface{})
-	Fatalf(format string, args ...interface{})
-	Fatalln(args ...interface{})
-	Print(args ...interface{})
-	Printf(format string, args ...interface{})
-	Println(args ...interface{})
+	Fatal(args ...any)
+	Fatalf(format string, args ...any)
+	Fatalln(args ...any)
+	Print(args ...any)
+	Printf(format string, args ...any)
+	Println(args ...any)
 }
 
 // SetLogger sets the logger that is used in grpc. Call only from
@@ -45,39 +45,39 @@ type loggerWrapper struct {
 	Logger
 }
 
-func (g *loggerWrapper) Info(args ...interface{}) {
+func (g *loggerWrapper) Info(args ...any) {
 	g.Logger.Print(args...)
 }
 
-func (g *loggerWrapper) Infoln(args ...interface{}) {
+func (g *loggerWrapper) Infoln(args ...any) {
 	g.Logger.Println(args...)
 }
 
-func (g *loggerWrapper) Infof(format string, args ...interface{}) {
+func (g *loggerWrapper) Infof(format string, args ...any) {
 	g.Logger.Printf(format, args...)
 }
 
-func (g *loggerWrapper) Warning(args ...interface{}) {
+func (g *loggerWrapper) Warning(args ...any) {
 	g.Logger.Print(args...)
 }
 
-func (g *loggerWrapper) Warningln(args ...interface{}) {
+func (g *loggerWrapper) Warningln(args ...any) {
 	g.Logger.Println(args...)
 }
 
-func (g *loggerWrapper) Warningf(format string, args ...interface{}) {
+func (g *loggerWrapper) Warningf(format string, args ...any) {
 	g.Logger.Printf(format, args...)
 }
 
-func (g *loggerWrapper) Error(args ...interface{}) {
+func (g *loggerWrapper) Error(args ...any) {
 	g.Logger.Print(args...)
 }
 
-func (g *loggerWrapper) Errorln(args ...interface{}) {
+func (g *loggerWrapper) Errorln(args ...any) {
 	g.Logger.Println(args...)
 }
 
-func (g *loggerWrapper) Errorf(format string, args ...interface{}) {
+func (g *loggerWrapper) Errorf(format string, args ...any) {
 	g.Logger.Printf(format, args...)
 }
 

vendor/google.golang.org/grpc/grpclog/loggerv2.go

@@ -33,35 +33,35 @@ import (
 // LoggerV2 does underlying logging work for grpclog.
 type LoggerV2 interface {
 	// Info logs to INFO log. Arguments are handled in the manner of fmt.Print.
-	Info(args ...interface{})
+	Info(args ...any)
 	// Infoln logs to INFO log. Arguments are handled in the manner of fmt.Println.
-	Infoln(args ...interface{})
+	Infoln(args ...any)
 	// Infof logs to INFO log. Arguments are handled in the manner of fmt.Printf.
-	Infof(format string, args ...interface{})
+	Infof(format string, args ...any)
 	// Warning logs to WARNING log. Arguments are handled in the manner of fmt.Print.
-	Warning(args ...interface{})
+	Warning(args ...any)
 	// Warningln logs to WARNING log. Arguments are handled in the manner of fmt.Println.
-	Warningln(args ...interface{})
+	Warningln(args ...any)
 	// Warningf logs to WARNING log. Arguments are handled in the manner of fmt.Printf.
-	Warningf(format string, args ...interface{})
+	Warningf(format string, args ...any)
 	// Error logs to ERROR log. Arguments are handled in the manner of fmt.Print.
-	Error(args ...interface{})
+	Error(args ...any)
 	// Errorln logs to ERROR log. Arguments are handled in the manner of fmt.Println.
-	Errorln(args ...interface{})
+	Errorln(args ...any)
 	// Errorf logs to ERROR log. Arguments are handled in the manner of fmt.Printf.
-	Errorf(format string, args ...interface{})
+	Errorf(format string, args ...any)
 	// Fatal logs to ERROR log. Arguments are handled in the manner of fmt.Print.
 	// gRPC ensures that all Fatal logs will exit with os.Exit(1).
 	// Implementations may also call os.Exit() with a non-zero exit code.
-	Fatal(args ...interface{})
+	Fatal(args ...any)
 	// Fatalln logs to ERROR log. Arguments are handled in the manner of fmt.Println.
 	// gRPC ensures that all Fatal logs will exit with os.Exit(1).
 	// Implementations may also call os.Exit() with a non-zero exit code.
-	Fatalln(args ...interface{})
+	Fatalln(args ...any)
 	// Fatalf logs to ERROR log. Arguments are handled in the manner of fmt.Printf.
 	// gRPC ensures that all Fatal logs will exit with os.Exit(1).
 	// Implementations may also call os.Exit() with a non-zero exit code.
-	Fatalf(format string, args ...interface{})
+	Fatalf(format string, args ...any)
 	// V reports whether verbosity level l is at least the requested verbose level.
 	V(l int) bool
 }
@@ -182,53 +182,53 @@ func (g *loggerT) output(severity int, s string) {
 	g.m[severity].Output(2, string(b))
 }
 
-func (g *loggerT) Info(args ...interface{}) {
+func (g *loggerT) Info(args ...any) {
 	g.output(infoLog, fmt.Sprint(args...))
 }
 
-func (g *loggerT) Infoln(args ...interface{}) {
+func (g *loggerT) Infoln(args ...any) {
 	g.output(infoLog, fmt.Sprintln(args...))
 }
 
-func (g *loggerT) Infof(format string, args ...interface{}) {
+func (g *loggerT) Infof(format string, args ...any) {
 	g.output(infoLog, fmt.Sprintf(format, args...))
 }
 
-func (g *loggerT) Warning(args ...interface{}) {
+func (g *loggerT) Warning(args ...any) {
 	g.output(warningLog, fmt.Sprint(args...))
 }
 
-func (g *loggerT) Warningln(args ...interface{}) {
+func (g *loggerT) Warningln(args ...any) {
 	g.output(warningLog, fmt.Sprintln(args...))
 }
 
-func (g *loggerT) Warningf(format string, args ...interface{}) {
+func (g *loggerT) Warningf(format string, args ...any) {
 	g.output(warningLog, fmt.Sprintf(format, args...))
 }
 
-func (g *loggerT) Error(args ...interface{}) {
+func (g *loggerT) Error(args ...any) {
 	g.output(errorLog, fmt.Sprint(args...))
 }
 
-func (g *loggerT) Errorln(args ...interface{}) {
+func (g *loggerT) Errorln(args ...any) {
 	g.output(errorLog, fmt.Sprintln(args...))
 }
 
-func (g *loggerT) Errorf(format string, args ...interface{}) {
+func (g *loggerT) Errorf(format string, args ...any) {
 	g.output(errorLog, fmt.Sprintf(format, args...))
 }
 
-func (g *loggerT) Fatal(args ...interface{}) {
+func (g *loggerT) Fatal(args ...any) {
 	g.output(fatalLog, fmt.Sprint(args...))
 	os.Exit(1)
 }
 
-func (g *loggerT) Fatalln(args ...interface{}) {
+func (g *loggerT) Fatalln(args ...any) {
 	g.output(fatalLog, fmt.Sprintln(args...))
 	os.Exit(1)
 }
 
-func (g *loggerT) Fatalf(format string, args ...interface{}) {
+func (g *loggerT) Fatalf(format string, args ...any) {
 	g.output(fatalLog, fmt.Sprintf(format, args...))
 	os.Exit(1)
 }
@@ -248,11 +248,11 @@ func (g *loggerT) V(l int) bool {
 type DepthLoggerV2 interface {
 	LoggerV2
 	// InfoDepth logs to INFO log at the specified depth. Arguments are handled in the manner of fmt.Println.
-	InfoDepth(depth int, args ...interface{})
+	InfoDepth(depth int, args ...any)
 	// WarningDepth logs to WARNING log at the specified depth. Arguments are handled in the manner of fmt.Println.
-	WarningDepth(depth int, args ...interface{})
+	WarningDepth(depth int, args ...any)
 	// ErrorDepth logs to ERROR log at the specified depth. Arguments are handled in the manner of fmt.Println.
-	ErrorDepth(depth int, args ...interface{})
+	ErrorDepth(depth int, args ...any)
 	// FatalDepth logs to FATAL log at the specified depth. Arguments are handled in the manner of fmt.Println.
-	FatalDepth(depth int, args ...interface{})
+	FatalDepth(depth int, args ...any)
 }

vendor/google.golang.org/grpc/interceptor.go

@@ -23,7 +23,7 @@ import (
 )
 
 // UnaryInvoker is called by UnaryClientInterceptor to complete RPCs.
-type UnaryInvoker func(ctx context.Context, method string, req, reply interface{}, cc *ClientConn, opts ...CallOption) error
+type UnaryInvoker func(ctx context.Context, method string, req, reply any, cc *ClientConn, opts ...CallOption) error
 
 // UnaryClientInterceptor intercepts the execution of a unary RPC on the client.
 // Unary interceptors can be specified as a DialOption, using
@@ -40,7 +40,7 @@ type UnaryInvoker func(ctx context.Context, method string, req, reply interface{
 // defaults from the ClientConn as well as per-call options.
 //
 // The returned error must be compatible with the status package.
-type UnaryClientInterceptor func(ctx context.Context, method string, req, reply interface{}, cc *ClientConn, invoker UnaryInvoker, opts ...CallOption) error
+type UnaryClientInterceptor func(ctx context.Context, method string, req, reply any, cc *ClientConn, invoker UnaryInvoker, opts ...CallOption) error
 
 // Streamer is called by StreamClientInterceptor to create a ClientStream.
 type Streamer func(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, opts ...CallOption) (ClientStream, error)
@@ -66,7 +66,7 @@ type StreamClientInterceptor func(ctx context.Context, desc *StreamDesc, cc *Cli
 // server side. All per-rpc information may be mutated by the interceptor.
 type UnaryServerInfo struct {
 	// Server is the service implementation the user provides. This is read-only.
-	Server interface{}
+	Server any
 	// FullMethod is the full RPC method string, i.e., /package.service/method.
 	FullMethod string
 }
@@ -78,13 +78,13 @@ type UnaryServerInfo struct {
 // status package, or be one of the context errors. Otherwise, gRPC will use
 // codes.Unknown as the status code and err.Error() as the status message of the
 // RPC.
-type UnaryHandler func(ctx context.Context, req interface{}) (interface{}, error)
+type UnaryHandler func(ctx context.Context, req any) (any, error)
 
 // UnaryServerInterceptor provides a hook to intercept the execution of a unary RPC on the server. info
 // contains all the information of this RPC the interceptor can operate on. And handler is the wrapper
 // of the service method implementation. It is the responsibility of the interceptor to invoke handler
 // to complete the RPC.
-type UnaryServerInterceptor func(ctx context.Context, req interface{}, info *UnaryServerInfo, handler UnaryHandler) (resp interface{}, err error)
+type UnaryServerInterceptor func(ctx context.Context, req any, info *UnaryServerInfo, handler UnaryHandler) (resp any, err error)
 
 // StreamServerInfo consists of various information about a streaming RPC on
 // server side. All per-rpc information may be mutated by the interceptor.
@@ -101,4 +101,4 @@ type StreamServerInfo struct {
 // info contains all the information of this RPC the interceptor can operate on. And handler is the
 // service method implementation. It is the responsibility of the interceptor to invoke handler to
 // complete the RPC.
-type StreamServerInterceptor func(srv interface{}, ss ServerStream, info *StreamServerInfo, handler StreamHandler) error
+type StreamServerInterceptor func(srv any, ss ServerStream, info *StreamServerInfo, handler StreamHandler) error

vendor/google.golang.org/grpc/internal/balancer/gracefulswitch/gracefulswitch.go

@@ -200,8 +200,8 @@ func (gsb *Balancer) ExitIdle() {
 	}
 }
 
-// UpdateSubConnState forwards the update to the appropriate child.
-func (gsb *Balancer) UpdateSubConnState(sc balancer.SubConn, state balancer.SubConnState) {
+// updateSubConnState forwards the update to the appropriate child.
+func (gsb *Balancer) updateSubConnState(sc balancer.SubConn, state balancer.SubConnState, cb func(balancer.SubConnState)) {
 	gsb.currentMu.Lock()
 	defer gsb.currentMu.Unlock()
 	gsb.mu.Lock()
@@ -214,14 +214,27 @@ func (gsb *Balancer) UpdateSubConnState(sc balancer.SubConn, state balancer.SubC
 	} else if gsb.balancerPending != nil && gsb.balancerPending.subconns[sc] {
 		balToUpdate = gsb.balancerPending
 	}
-	gsb.mu.Unlock()
 	if balToUpdate == nil {
 		// SubConn belonged to a stale lb policy that has not yet fully closed,
 		// or the balancer was already closed.
+		gsb.mu.Unlock()
 		return
 	}
+	if state.ConnectivityState == connectivity.Shutdown {
+		delete(balToUpdate.subconns, sc)
+	}
+	gsb.mu.Unlock()
+	if cb != nil {
+		cb(state)
+	} else {
 		balToUpdate.UpdateSubConnState(sc, state)
 	}
+}
+
+// UpdateSubConnState forwards the update to the appropriate child.
+func (gsb *Balancer) UpdateSubConnState(sc balancer.SubConn, state balancer.SubConnState) {
+	gsb.updateSubConnState(sc, state, nil)
+}
 
 // Close closes any active child balancers.
 func (gsb *Balancer) Close() {
@@ -242,7 +255,7 @@ func (gsb *Balancer) Close() {
 //
 // It implements the balancer.ClientConn interface and is passed down in that
 // capacity to the wrapped balancer. It maintains a set of subConns created by
-// the wrapped balancer and calls from the latter to create/update/remove
+// the wrapped balancer and calls from the latter to create/update/shutdown
 // SubConns update this set before being forwarded to the parent ClientConn.
 // State updates from the wrapped balancer can result in invocation of the
 // graceful switch logic.
@@ -254,21 +267,10 @@ type balancerWrapper struct {
 	subconns  map[balancer.SubConn]bool // subconns created by this balancer
 }
 
-func (bw *balancerWrapper) UpdateSubConnState(sc balancer.SubConn, state balancer.SubConnState) {
-	if state.ConnectivityState == connectivity.Shutdown {
-		bw.gsb.mu.Lock()
-		delete(bw.subconns, sc)
-		bw.gsb.mu.Unlock()
-	}
-	// There is no need to protect this read with a mutex, as the write to the
-	// Balancer field happens in SwitchTo, which completes before this can be
-	// called.
-	bw.Balancer.UpdateSubConnState(sc, state)
-}
-
-// Close closes the underlying LB policy and removes the subconns it created. bw
-// must not be referenced via balancerCurrent or balancerPending in gsb when
-// called. gsb.mu must not be held.  Does not panic with a nil receiver.
+// Close closes the underlying LB policy and shuts down the subconns it
+// created. bw must not be referenced via balancerCurrent or balancerPending in
+// gsb when called. gsb.mu must not be held.  Does not panic with a nil
+// receiver.
 func (bw *balancerWrapper) Close() {
 	// before Close is called.
 	if bw == nil {
@@ -281,7 +283,7 @@ func (bw *balancerWrapper) Close() {
 	bw.Balancer.Close()
 	bw.gsb.mu.Lock()
 	for sc := range bw.subconns {
-		bw.gsb.cc.RemoveSubConn(sc)
+		sc.Shutdown()
 	}
 	bw.gsb.mu.Unlock()
 }
@@ -335,13 +337,16 @@ func (bw *balancerWrapper) NewSubConn(addrs []resolver.Address, opts balancer.Ne
 	}
 	bw.gsb.mu.Unlock()
 
+	var sc balancer.SubConn
+	oldListener := opts.StateListener
+	opts.StateListener = func(state balancer.SubConnState) { bw.gsb.updateSubConnState(sc, state, oldListener) }
 	sc, err := bw.gsb.cc.NewSubConn(addrs, opts)
 	if err != nil {
 		return nil, err
 	}
 	bw.gsb.mu.Lock()
 	if !bw.gsb.balancerCurrentOrPending(bw) { // balancer was closed during this call
-		bw.gsb.cc.RemoveSubConn(sc)
+		sc.Shutdown()
 		bw.gsb.mu.Unlock()
 		return nil, fmt.Errorf("%T at address %p that called NewSubConn is deleted", bw, bw)
 	}
@@ -360,13 +365,9 @@ func (bw *balancerWrapper) ResolveNow(opts resolver.ResolveNowOptions) {
 }
 
 func (bw *balancerWrapper) RemoveSubConn(sc balancer.SubConn) {
-	bw.gsb.mu.Lock()
-	if !bw.gsb.balancerCurrentOrPending(bw) {
-		bw.gsb.mu.Unlock()
-		return
-	}
-	bw.gsb.mu.Unlock()
-	bw.gsb.cc.RemoveSubConn(sc)
+	// Note: existing third party balancers may call this, so it must remain
+	// until RemoveSubConn is fully removed.
+	sc.Shutdown()
 }
 
 func (bw *balancerWrapper) UpdateAddresses(sc balancer.SubConn, addrs []resolver.Address) {

vendor/google.golang.org/grpc/internal/balancerload/load.go

@@ -25,7 +25,7 @@ import (
 // Parser converts loads from metadata into a concrete type.
 type Parser interface {
 	// Parse parses loads from metadata.
-	Parse(md metadata.MD) interface{}
+	Parse(md metadata.MD) any
 }
 
 var parser Parser
@@ -38,7 +38,7 @@ func SetParser(lr Parser) {
 }
 
 // Parse calls parser.Read().
-func Parse(md metadata.MD) interface{} {
+func Parse(md metadata.MD) any {
 	if parser == nil {
 		return nil
 	}

vendor/google.golang.org/grpc/internal/binarylog/method_logger.go

@@ -230,7 +230,7 @@ type ClientMessage struct {
 	OnClientSide bool
 	// Message can be a proto.Message or []byte. Other messages formats are not
 	// supported.
-	Message interface{}
+	Message any
 }
 
 func (c *ClientMessage) toProto() *binlogpb.GrpcLogEntry {
@@ -270,7 +270,7 @@ type ServerMessage struct {
 	OnClientSide bool
 	// Message can be a proto.Message or []byte. Other messages formats are not
 	// supported.
-	Message interface{}
+	Message any
 }
 
 func (c *ServerMessage) toProto() *binlogpb.GrpcLogEntry {

vendor/google.golang.org/grpc/internal/buffer/unbounded.go

@@ -28,25 +28,25 @@ import "sync"
 // the underlying mutex used for synchronization.
 //
 // Unbounded supports values of any type to be stored in it by using a channel
-// of `interface{}`. This means that a call to Put() incurs an extra memory
-// allocation, and also that users need a type assertion while reading. For
-// performance critical code paths, using Unbounded is strongly discouraged and
-// defining a new type specific implementation of this buffer is preferred. See
+// of `any`. This means that a call to Put() incurs an extra memory allocation,
+// and also that users need a type assertion while reading. For performance
+// critical code paths, using Unbounded is strongly discouraged and defining a
+// new type specific implementation of this buffer is preferred. See
 // internal/transport/transport.go for an example of this.
 type Unbounded struct {
-	c       chan interface{}
+	c       chan any
 	closed  bool
 	mu      sync.Mutex
-	backlog []interface{}
+	backlog []any
 }
 
 // NewUnbounded returns a new instance of Unbounded.
 func NewUnbounded() *Unbounded {
-	return &Unbounded{c: make(chan interface{}, 1)}
+	return &Unbounded{c: make(chan any, 1)}
 }
 
 // Put adds t to the unbounded buffer.
-func (b *Unbounded) Put(t interface{}) {
+func (b *Unbounded) Put(t any) {
 	b.mu.Lock()
 	defer b.mu.Unlock()
 	if b.closed {
@@ -89,7 +89,7 @@ func (b *Unbounded) Load() {
 //
 // If the unbounded buffer is closed, the read channel returned by this method
 // is closed.
-func (b *Unbounded) Get() <-chan interface{} {
+func (b *Unbounded) Get() <-chan any {
 	return b.c
 }
 

vendor/google.golang.org/grpc/internal/channelz/funcs.go

@@ -24,9 +24,7 @@
 package channelz
 
 import (
-	"context"
 	"errors"
-	"fmt"
 	"sort"
 	"sync"
 	"sync/atomic"
@@ -40,8 +38,11 @@ const (
 )
 
 var (
+	// IDGen is the global channelz entity ID generator.  It should not be used
+	// outside this package except by tests.
+	IDGen IDGenerator
+
 	db dbWrapper
-	idGen idGenerator
 	// EntryPerPage defines the number of channelz entries to be shown on a web page.
 	EntryPerPage  = int64(50)
 	curState      int32
@@ -52,14 +53,14 @@ var (
 func TurnOn() {
 	if !IsOn() {
 		db.set(newChannelMap())
-		idGen.reset()
+		IDGen.Reset()
 		atomic.StoreInt32(&curState, 1)
 	}
 }
 
 // IsOn returns whether channelz data collection is on.
 func IsOn() bool {
-	return atomic.CompareAndSwapInt32(&curState, 1, 1)
+	return atomic.LoadInt32(&curState) == 1
 }
 
 // SetMaxTraceEntry sets maximum number of trace entry per entity (i.e. channel/subchannel).
@@ -97,43 +98,6 @@ func (d *dbWrapper) get() *channelMap {
 	return d.DB
 }
 
-// NewChannelzStorageForTesting initializes channelz data storage and id
-// generator for testing purposes.
-//
-// Returns a cleanup function to be invoked by the test, which waits for up to
-// 10s for all channelz state to be reset by the grpc goroutines when those
-// entities get closed. This cleanup function helps with ensuring that tests
-// don't mess up each other.
-func NewChannelzStorageForTesting() (cleanup func() error) {
-	db.set(newChannelMap())
-	idGen.reset()
-
-	return func() error {
-		cm := db.get()
-		if cm == nil {
-			return nil
-		}
-
-		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
-		defer cancel()
-		ticker := time.NewTicker(10 * time.Millisecond)
-		defer ticker.Stop()
-		for {
-			cm.mu.RLock()
-			topLevelChannels, servers, channels, subChannels, listenSockets, normalSockets := len(cm.topLevelChannels), len(cm.servers), len(cm.channels), len(cm.subChannels), len(cm.listenSockets), len(cm.normalSockets)
-			cm.mu.RUnlock()
-
-			if err := ctx.Err(); err != nil {
-				return fmt.Errorf("after 10s the channelz map has not been cleaned up yet, topchannels: %d, servers: %d, channels: %d, subchannels: %d, listen sockets: %d, normal sockets: %d", topLevelChannels, servers, channels, subChannels, listenSockets, normalSockets)
-			}
-			if topLevelChannels == 0 && servers == 0 && channels == 0 && subChannels == 0 && listenSockets == 0 && normalSockets == 0 {
-				return nil
-			}
-			<-ticker.C
-		}
-	}
-}
-
 // GetTopChannels returns a slice of top channel's ChannelMetric, along with a
 // boolean indicating whether there's more top channels to be queried for.
 //
@@ -193,7 +157,7 @@ func GetServer(id int64) *ServerMetric {
 //
 // If channelz is not turned ON, the channelz database is not mutated.
 func RegisterChannel(c Channel, pid *Identifier, ref string) *Identifier {
-	id := idGen.genID()
+	id := IDGen.genID()
 	var parent int64
 	isTopChannel := true
 	if pid != nil {
@@ -229,7 +193,7 @@ func RegisterSubChannel(c Channel, pid *Identifier, ref string) (*Identifier, er
 	if pid == nil {
 		return nil, errors.New("a SubChannel's parent id cannot be nil")
 	}
-	id := idGen.genID()
+	id := IDGen.genID()
 	if !IsOn() {
 		return newIdentifer(RefSubChannel, id, pid), nil
 	}
@@ -251,7 +215,7 @@ func RegisterSubChannel(c Channel, pid *Identifier, ref string) (*Identifier, er
 //
 // If channelz is not turned ON, the channelz database is not mutated.
 func RegisterServer(s Server, ref string) *Identifier {
-	id := idGen.genID()
+	id := IDGen.genID()
 	if !IsOn() {
 		return newIdentifer(RefServer, id, nil)
 	}
@@ -277,7 +241,7 @@ func RegisterListenSocket(s Socket, pid *Identifier, ref string) (*Identifier, e
 	if pid == nil {
 		return nil, errors.New("a ListenSocket's parent id cannot be 0")
 	}
-	id := idGen.genID()
+	id := IDGen.genID()
 	if !IsOn() {
 		return newIdentifer(RefListenSocket, id, pid), nil
 	}
@@ -297,7 +261,7 @@ func RegisterNormalSocket(s Socket, pid *Identifier, ref string) (*Identifier, e
 	if pid == nil {
 		return nil, errors.New("a NormalSocket's parent id cannot be 0")
 	}
-	id := idGen.genID()
+	id := IDGen.genID()
 	if !IsOn() {
 		return newIdentifer(RefNormalSocket, id, pid), nil
 	}
@@ -776,14 +740,17 @@ func (c *channelMap) GetServer(id int64) *ServerMetric {
 	return sm
 }
 
-type idGenerator struct {
+// IDGenerator is an incrementing atomic that tracks IDs for channelz entities.
+type IDGenerator struct {
 	id int64
 }
 
-func (i *idGenerator) reset() {
+// Reset resets the generated ID back to zero.  Should only be used at
+// initialization or by tests sensitive to the ID number.
+func (i *IDGenerator) Reset() {
 	atomic.StoreInt64(&i.id, 0)
 }
 
-func (i *idGenerator) genID() int64 {
+func (i *IDGenerator) genID() int64 {
 	return atomic.AddInt64(&i.id, 1)
 }

vendor/google.golang.org/grpc/internal/channelz/logging.go

@@ -31,7 +31,7 @@ func withParens(id *Identifier) string {
 }
 
 // Info logs and adds a trace event if channelz is on.
-func Info(l grpclog.DepthLoggerV2, id *Identifier, args ...interface{}) {
+func Info(l grpclog.DepthLoggerV2, id *Identifier, args ...any) {
 	AddTraceEvent(l, id, 1, &TraceEventDesc{
 		Desc:     fmt.Sprint(args...),
 		Severity: CtInfo,
@@ -39,7 +39,7 @@ func Info(l grpclog.DepthLoggerV2, id *Identifier, args ...interface{}) {
 }
 
 // Infof logs and adds a trace event if channelz is on.
-func Infof(l grpclog.DepthLoggerV2, id *Identifier, format string, args ...interface{}) {
+func Infof(l grpclog.DepthLoggerV2, id *Identifier, format string, args ...any) {
 	AddTraceEvent(l, id, 1, &TraceEventDesc{
 		Desc:     fmt.Sprintf(format, args...),
 		Severity: CtInfo,
@@ -47,7 +47,7 @@ func Infof(l grpclog.DepthLoggerV2, id *Identifier, format string, args ...inter
 }
 
 // Warning logs and adds a trace event if channelz is on.
-func Warning(l grpclog.DepthLoggerV2, id *Identifier, args ...interface{}) {
+func Warning(l grpclog.DepthLoggerV2, id *Identifier, args ...any) {
 	AddTraceEvent(l, id, 1, &TraceEventDesc{
 		Desc:     fmt.Sprint(args...),
 		Severity: CtWarning,
@@ -55,7 +55,7 @@ func Warning(l grpclog.DepthLoggerV2, id *Identifier, args ...interface{}) {
 }
 
 // Warningf logs and adds a trace event if channelz is on.
-func Warningf(l grpclog.DepthLoggerV2, id *Identifier, format string, args ...interface{}) {
+func Warningf(l grpclog.DepthLoggerV2, id *Identifier, format string, args ...any) {
 	AddTraceEvent(l, id, 1, &TraceEventDesc{
 		Desc:     fmt.Sprintf(format, args...),
 		Severity: CtWarning,
@@ -63,7 +63,7 @@ func Warningf(l grpclog.DepthLoggerV2, id *Identifier, format string, args ...in
 }
 
 // Error logs and adds a trace event if channelz is on.
-func Error(l grpclog.DepthLoggerV2, id *Identifier, args ...interface{}) {
+func Error(l grpclog.DepthLoggerV2, id *Identifier, args ...any) {
 	AddTraceEvent(l, id, 1, &TraceEventDesc{
 		Desc:     fmt.Sprint(args...),
 		Severity: CtError,
@@ -71,7 +71,7 @@ func Error(l grpclog.DepthLoggerV2, id *Identifier, args ...interface{}) {
 }
 
 // Errorf logs and adds a trace event if channelz is on.
-func Errorf(l grpclog.DepthLoggerV2, id *Identifier, format string, args ...interface{}) {
+func Errorf(l grpclog.DepthLoggerV2, id *Identifier, format string, args ...any) {
 	AddTraceEvent(l, id, 1, &TraceEventDesc{
 		Desc:     fmt.Sprintf(format, args...),
 		Severity: CtError,

vendor/google.golang.org/grpc/internal/channelz/types.go

@@ -628,6 +628,7 @@ type tracedChannel interface {
 
 type channelTrace struct {
 	cm          *channelMap
+	clearCalled bool
 	createdTime time.Time
 	eventCount  int64
 	mu          sync.Mutex
@@ -656,6 +657,10 @@ func (c *channelTrace) append(e *TraceEvent) {
 }
 
 func (c *channelTrace) clear() {
+	if c.clearCalled {
+		return
+	}
+	c.clearCalled = true
 	c.mu.Lock()
 	for _, e := range c.events {
 		if e.RefID != 0 {

vendor/google.golang.org/grpc/internal/channelz/util_linux.go

@@ -23,7 +23,7 @@ import (
 )
 
 // GetSocketOption gets the socket option info of the conn.
-func GetSocketOption(socket interface{}) *SocketOptionData {
+func GetSocketOption(socket any) *SocketOptionData {
 	c, ok := socket.(syscall.Conn)
 	if !ok {
 		return nil

vendor/google.golang.org/grpc/internal/channelz/util_nonlinux.go

@@ -22,6 +22,6 @@
 package channelz
 
 // GetSocketOption gets the socket option info of the conn.
-func GetSocketOption(c interface{}) *SocketOptionData {
+func GetSocketOption(c any) *SocketOptionData {
 	return nil
 }

vendor/google.golang.org/grpc/internal/credentials/credentials.go

@@ -25,12 +25,12 @@ import (
 type requestInfoKey struct{}
 
 // NewRequestInfoContext creates a context with ri.
-func NewRequestInfoContext(ctx context.Context, ri interface{}) context.Context {
+func NewRequestInfoContext(ctx context.Context, ri any) context.Context {
 	return context.WithValue(ctx, requestInfoKey{}, ri)
 }
 
 // RequestInfoFromContext extracts the RequestInfo from ctx.
-func RequestInfoFromContext(ctx context.Context) interface{} {
+func RequestInfoFromContext(ctx context.Context) any {
 	return ctx.Value(requestInfoKey{})
 }
 
@@ -39,11 +39,11 @@ func RequestInfoFromContext(ctx context.Context) interface{} {
 type clientHandshakeInfoKey struct{}
 
 // ClientHandshakeInfoFromContext extracts the ClientHandshakeInfo from ctx.
-func ClientHandshakeInfoFromContext(ctx context.Context) interface{} {
+func ClientHandshakeInfoFromContext(ctx context.Context) any {
 	return ctx.Value(clientHandshakeInfoKey{})
 }
 
 // NewClientHandshakeInfoContext creates a context with chi.
-func NewClientHandshakeInfoContext(ctx context.Context, chi interface{}) context.Context {
+func NewClientHandshakeInfoContext(ctx context.Context, chi any) context.Context {
 	return context.WithValue(ctx, clientHandshakeInfoKey{}, chi)
 }

vendor/google.golang.org/grpc/internal/envconfig/envconfig.go

@@ -37,9 +37,15 @@ var (
 	// checking which NACKs configs specifying ring sizes > 8*1024*1024 (~8M).
 	RingHashCap = uint64FromEnv("GRPC_RING_HASH_CAP", 4096, 1, 8*1024*1024)
 	// PickFirstLBConfig is set if we should support configuration of the
-	// pick_first LB policy, which can be enabled by setting the environment
-	// variable "GRPC_EXPERIMENTAL_PICKFIRST_LB_CONFIG" to "true".
-	PickFirstLBConfig = boolFromEnv("GRPC_EXPERIMENTAL_PICKFIRST_LB_CONFIG", false)
+	// pick_first LB policy.
+	PickFirstLBConfig = boolFromEnv("GRPC_EXPERIMENTAL_PICKFIRST_LB_CONFIG", true)
+	// LeastRequestLB is set if we should support the least_request_experimental
+	// LB policy, which can be enabled by setting the environment variable
+	// "GRPC_EXPERIMENTAL_ENABLE_LEAST_REQUEST" to "true".
+	LeastRequestLB = boolFromEnv("GRPC_EXPERIMENTAL_ENABLE_LEAST_REQUEST", false)
+	// ALTSMaxConcurrentHandshakes is the maximum number of concurrent ALTS
+	// handshakes that can be performed.
+	ALTSMaxConcurrentHandshakes = uint64FromEnv("GRPC_ALTS_MAX_CONCURRENT_HANDSHAKES", 100, 1, 100)
 )
 
 func boolFromEnv(envVar string, def bool) bool {

vendor/google.golang.org/grpc/internal/grpclog/grpclog.go

@@ -30,7 +30,7 @@ var Logger LoggerV2
 var DepthLogger DepthLoggerV2
 
 // InfoDepth logs to the INFO log at the specified depth.
-func InfoDepth(depth int, args ...interface{}) {
+func InfoDepth(depth int, args ...any) {
 	if DepthLogger != nil {
 		DepthLogger.InfoDepth(depth, args...)
 	} else {
@@ -39,7 +39,7 @@ func InfoDepth(depth int, args ...interface{}) {
 }
 
 // WarningDepth logs to the WARNING log at the specified depth.
-func WarningDepth(depth int, args ...interface{}) {
+func WarningDepth(depth int, args ...any) {
 	if DepthLogger != nil {
 		DepthLogger.WarningDepth(depth, args...)
 	} else {
@@ -48,7 +48,7 @@ func WarningDepth(depth int, args ...interface{}) {
 }
 
 // ErrorDepth logs to the ERROR log at the specified depth.
-func ErrorDepth(depth int, args ...interface{}) {
+func ErrorDepth(depth int, args ...any) {
 	if DepthLogger != nil {
 		DepthLogger.ErrorDepth(depth, args...)
 	} else {
@@ -57,7 +57,7 @@ func ErrorDepth(depth int, args ...interface{}) {
 }
 
 // FatalDepth logs to the FATAL log at the specified depth.
-func FatalDepth(depth int, args ...interface{}) {
+func FatalDepth(depth int, args ...any) {
 	if DepthLogger != nil {
 		DepthLogger.FatalDepth(depth, args...)
 	} else {
@@ -71,35 +71,35 @@ func FatalDepth(depth int, args ...interface{}) {
 // is defined here to avoid a circular dependency.
 type LoggerV2 interface {
 	// Info logs to INFO log. Arguments are handled in the manner of fmt.Print.
-	Info(args ...interface{})
+	Info(args ...any)
 	// Infoln logs to INFO log. Arguments are handled in the manner of fmt.Println.
-	Infoln(args ...interface{})
+	Infoln(args ...any)
 	// Infof logs to INFO log. Arguments are handled in the manner of fmt.Printf.
-	Infof(format string, args ...interface{})
+	Infof(format string, args ...any)
 	// Warning logs to WARNING log. Arguments are handled in the manner of fmt.Print.
-	Warning(args ...interface{})
+	Warning(args ...any)
 	// Warningln logs to WARNING log. Arguments are handled in the manner of fmt.Println.
-	Warningln(args ...interface{})
+	Warningln(args ...any)
 	// Warningf logs to WARNING log. Arguments are handled in the manner of fmt.Printf.
-	Warningf(format string, args ...interface{})
+	Warningf(format string, args ...any)
 	// Error logs to ERROR log. Arguments are handled in the manner of fmt.Print.
-	Error(args ...interface{})
+	Error(args ...any)
 	// Errorln logs to ERROR log. Arguments are handled in the manner of fmt.Println.
-	Errorln(args ...interface{})
+	Errorln(args ...any)
 	// Errorf logs to ERROR log. Arguments are handled in the manner of fmt.Printf.
-	Errorf(format string, args ...interface{})
+	Errorf(format string, args ...any)
 	// Fatal logs to ERROR log. Arguments are handled in the manner of fmt.Print.
 	// gRPC ensures that all Fatal logs will exit with os.Exit(1).
 	// Implementations may also call os.Exit() with a non-zero exit code.
-	Fatal(args ...interface{})
+	Fatal(args ...any)
 	// Fatalln logs to ERROR log. Arguments are handled in the manner of fmt.Println.
 	// gRPC ensures that all Fatal logs will exit with os.Exit(1).
 	// Implementations may also call os.Exit() with a non-zero exit code.
-	Fatalln(args ...interface{})
+	Fatalln(args ...any)
 	// Fatalf logs to ERROR log. Arguments are handled in the manner of fmt.Printf.
 	// gRPC ensures that all Fatal logs will exit with os.Exit(1).
 	// Implementations may also call os.Exit() with a non-zero exit code.
-	Fatalf(format string, args ...interface{})
+	Fatalf(format string, args ...any)
 	// V reports whether verbosity level l is at least the requested verbose level.
 	V(l int) bool
 }
@@ -116,11 +116,11 @@ type LoggerV2 interface {
 // later release.
 type DepthLoggerV2 interface {
 	// InfoDepth logs to INFO log at the specified depth. Arguments are handled in the manner of fmt.Println.
-	InfoDepth(depth int, args ...interface{})
+	InfoDepth(depth int, args ...any)
 	// WarningDepth logs to WARNING log at the specified depth. Arguments are handled in the manner of fmt.Println.
-	WarningDepth(depth int, args ...interface{})
+	WarningDepth(depth int, args ...any)
 	// ErrorDepth logs to ERROR log at the specified depth. Arguments are handled in the manner of fmt.Println.
-	ErrorDepth(depth int, args ...interface{})
+	ErrorDepth(depth int, args ...any)
 	// FatalDepth logs to FATAL log at the specified depth. Arguments are handled in the manner of fmt.Println.
-	FatalDepth(depth int, args ...interface{})
+	FatalDepth(depth int, args ...any)
 }

vendor/google.golang.org/grpc/internal/grpclog/prefixLogger.go

@@ -31,7 +31,7 @@ type PrefixLogger struct {
 }
 
 // Infof does info logging.
-func (pl *PrefixLogger) Infof(format string, args ...interface{}) {
+func (pl *PrefixLogger) Infof(format string, args ...any) {
 	if pl != nil {
 		// Handle nil, so the tests can pass in a nil logger.
 		format = pl.prefix + format
@@ -42,7 +42,7 @@ func (pl *PrefixLogger) Infof(format string, args ...interface{}) {
 }
 
 // Warningf does warning logging.
-func (pl *PrefixLogger) Warningf(format string, args ...interface{}) {
+func (pl *PrefixLogger) Warningf(format string, args ...any) {
 	if pl != nil {
 		format = pl.prefix + format
 		pl.logger.WarningDepth(1, fmt.Sprintf(format, args...))
@@ -52,7 +52,7 @@ func (pl *PrefixLogger) Warningf(format string, args ...interface{}) {
 }
 
 // Errorf does error logging.
-func (pl *PrefixLogger) Errorf(format string, args ...interface{}) {
+func (pl *PrefixLogger) Errorf(format string, args ...any) {
 	if pl != nil {
 		format = pl.prefix + format
 		pl.logger.ErrorDepth(1, fmt.Sprintf(format, args...))
@@ -62,7 +62,7 @@ func (pl *PrefixLogger) Errorf(format string, args ...interface{}) {
 }
 
 // Debugf does info logging at verbose level 2.
-func (pl *PrefixLogger) Debugf(format string, args ...interface{}) {
+func (pl *PrefixLogger) Debugf(format string, args ...any) {
 	// TODO(6044): Refactor interfaces LoggerV2 and DepthLogger, and maybe
 	// rewrite PrefixLogger a little to ensure that we don't use the global
 	// `Logger` here, and instead use the `logger` field.

vendor/google.golang.org/grpc/internal/grpcrand/grpcrand.go

@@ -80,6 +80,13 @@ func Uint32() uint32 {
 	return r.Uint32()
 }
 
+// ExpFloat64 implements rand.ExpFloat64 on the grpcrand global source.
+func ExpFloat64() float64 {
+	mu.Lock()
+	defer mu.Unlock()
+	return r.ExpFloat64()
+}
+
 // Shuffle implements rand.Shuffle on the grpcrand global source.
 var Shuffle = func(n int, f func(int, int)) {
 	mu.Lock()

vendor/google.golang.org/grpc/internal/grpcsync/callback_serializer.go

@@ -32,10 +32,10 @@ import (
 //
 // This type is safe for concurrent access.
 type CallbackSerializer struct {
-	// Done is closed once the serializer is shut down completely, i.e all
+	// done is closed once the serializer is shut down completely, i.e all
 	// scheduled callbacks are executed and the serializer has deallocated all
 	// its resources.
-	Done chan struct{}
+	done chan struct{}
 
 	callbacks *buffer.Unbounded
 	closedMu  sync.Mutex
@@ -48,12 +48,12 @@ type CallbackSerializer struct {
 // callbacks will be added once this context is canceled, and any pending un-run
 // callbacks will be executed before the serializer is shut down.
 func NewCallbackSerializer(ctx context.Context) *CallbackSerializer {
-	t := &CallbackSerializer{
-		Done:      make(chan struct{}),
+	cs := &CallbackSerializer{
+		done:      make(chan struct{}),
 		callbacks: buffer.NewUnbounded(),
 	}
-	go t.run(ctx)
-	return t
+	go cs.run(ctx)
+	return cs
 }
 
 // Schedule adds a callback to be scheduled after existing callbacks are run.
@@ -64,56 +64,62 @@ func NewCallbackSerializer(ctx context.Context) *CallbackSerializer {
 // Return value indicates if the callback was successfully added to the list of
 // callbacks to be executed by the serializer. It is not possible to add
 // callbacks once the context passed to NewCallbackSerializer is cancelled.
-func (t *CallbackSerializer) Schedule(f func(ctx context.Context)) bool {
-	t.closedMu.Lock()
-	defer t.closedMu.Unlock()
+func (cs *CallbackSerializer) Schedule(f func(ctx context.Context)) bool {
+	cs.closedMu.Lock()
+	defer cs.closedMu.Unlock()
 
-	if t.closed {
+	if cs.closed {
 		return false
 	}
-	t.callbacks.Put(f)
+	cs.callbacks.Put(f)
 	return true
 }
 
-func (t *CallbackSerializer) run(ctx context.Context) {
+func (cs *CallbackSerializer) run(ctx context.Context) {
 	var backlog []func(context.Context)
 
-	defer close(t.Done)
+	defer close(cs.done)
 	for ctx.Err() == nil {
 		select {
 		case <-ctx.Done():
 			// Do nothing here. Next iteration of the for loop will not happen,
 			// since ctx.Err() would be non-nil.
-		case callback, ok := <-t.callbacks.Get():
+		case callback, ok := <-cs.callbacks.Get():
 			if !ok {
 				return
 			}
-			t.callbacks.Load()
+			cs.callbacks.Load()
 			callback.(func(ctx context.Context))(ctx)
 		}
 	}
 
 	// Fetch pending callbacks if any, and execute them before returning from
-	// this method and closing t.Done.
-	t.closedMu.Lock()
-	t.closed = true
-	backlog = t.fetchPendingCallbacks()
-	t.callbacks.Close()
-	t.closedMu.Unlock()
+	// this method and closing cs.done.
+	cs.closedMu.Lock()
+	cs.closed = true
+	backlog = cs.fetchPendingCallbacks()
+	cs.callbacks.Close()
+	cs.closedMu.Unlock()
 	for _, b := range backlog {
 		b(ctx)
 	}
 }
 
-func (t *CallbackSerializer) fetchPendingCallbacks() []func(context.Context) {
+func (cs *CallbackSerializer) fetchPendingCallbacks() []func(context.Context) {
 	var backlog []func(context.Context)
 	for {
 		select {
-		case b := <-t.callbacks.Get():
+		case b := <-cs.callbacks.Get():
 			backlog = append(backlog, b.(func(context.Context)))
-			t.callbacks.Load()
+			cs.callbacks.Load()
 		default:
 			return backlog
 		}
 	}
 }
+
+// Done returns a channel that is closed after the context passed to
+// NewCallbackSerializer is canceled and all callbacks have been executed.
+func (cs *CallbackSerializer) Done() <-chan struct{} {
+	return cs.done
+}

vendor/google.golang.org/grpc/internal/grpcsync/pubsub.go

@@ -0,0 +1,121 @@
+/*
+ *
+ * Copyright 2023 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpcsync
+
+import (
+	"context"
+	"sync"
+)
+
+// Subscriber represents an entity that is subscribed to messages published on
+// a PubSub. It wraps the callback to be invoked by the PubSub when a new
+// message is published.
+type Subscriber interface {
+	// OnMessage is invoked when a new message is published. Implementations
+	// must not block in this method.
+	OnMessage(msg any)
+}
+
+// PubSub is a simple one-to-many publish-subscribe system that supports
+// messages of arbitrary type. It guarantees that messages are delivered in
+// the same order in which they were published.
+//
+// Publisher invokes the Publish() method to publish new messages, while
+// subscribers interested in receiving these messages register a callback
+// via the Subscribe() method.
+//
+// Once a PubSub is stopped, no more messages can be published, but any pending
+// published messages will be delivered to the subscribers.  Done may be used
+// to determine when all published messages have been delivered.
+type PubSub struct {
+	cs *CallbackSerializer
+
+	// Access to the below fields are guarded by this mutex.
+	mu          sync.Mutex
+	msg         any
+	subscribers map[Subscriber]bool
+}
+
+// NewPubSub returns a new PubSub instance.  Users should cancel the
+// provided context to shutdown the PubSub.
+func NewPubSub(ctx context.Context) *PubSub {
+	return &PubSub{
+		cs:          NewCallbackSerializer(ctx),
+		subscribers: map[Subscriber]bool{},
+	}
+}
+
+// Subscribe registers the provided Subscriber to the PubSub.
+//
+// If the PubSub contains a previously published message, the Subscriber's
+// OnMessage() callback will be invoked asynchronously with the existing
+// message to begin with, and subsequently for every newly published message.
+//
+// The caller is responsible for invoking the returned cancel function to
+// unsubscribe itself from the PubSub.
+func (ps *PubSub) Subscribe(sub Subscriber) (cancel func()) {
+	ps.mu.Lock()
+	defer ps.mu.Unlock()
+
+	ps.subscribers[sub] = true
+
+	if ps.msg != nil {
+		msg := ps.msg
+		ps.cs.Schedule(func(context.Context) {
+			ps.mu.Lock()
+			defer ps.mu.Unlock()
+			if !ps.subscribers[sub] {
+				return
+			}
+			sub.OnMessage(msg)
+		})
+	}
+
+	return func() {
+		ps.mu.Lock()
+		defer ps.mu.Unlock()
+		delete(ps.subscribers, sub)
+	}
+}
+
+// Publish publishes the provided message to the PubSub, and invokes
+// callbacks registered by subscribers asynchronously.
+func (ps *PubSub) Publish(msg any) {
+	ps.mu.Lock()
+	defer ps.mu.Unlock()
+
+	ps.msg = msg
+	for sub := range ps.subscribers {
+		s := sub
+		ps.cs.Schedule(func(context.Context) {
+			ps.mu.Lock()
+			defer ps.mu.Unlock()
+			if !ps.subscribers[s] {
+				return
+			}
+			s.OnMessage(msg)
+		})
+	}
+}
+
+// Done returns a channel that is closed after the context passed to NewPubSub
+// is canceled and all updates have been sent to subscribers.
+func (ps *PubSub) Done() <-chan struct{} {
+	return ps.cs.Done()
+}

vendor/google.golang.org/grpc/internal/idle/idle.go

@@ -16,7 +16,9 @@
  *
  */
 
-package grpc
+// Package idle contains a component for managing idleness (entering and exiting)
+// based on RPC activity.
+package idle
 
 import (
 	"fmt"
@@ -24,6 +26,8 @@ import (
 	"sync"
 	"sync/atomic"
 	"time"
+
+	"google.golang.org/grpc/grpclog"
 )
 
 // For overriding in unit tests.
@@ -31,31 +35,31 @@ var timeAfterFunc = func(d time.Duration, f func()) *time.Timer {
 	return time.AfterFunc(d, f)
 }
 
-// idlenessEnforcer is the functionality provided by grpc.ClientConn to enter
+// Enforcer is the functionality provided by grpc.ClientConn to enter
 // and exit from idle mode.
-type idlenessEnforcer interface {
-	exitIdleMode() error
-	enterIdleMode() error
+type Enforcer interface {
+	ExitIdleMode() error
+	EnterIdleMode() error
 }
 
-// idlenessManager defines the functionality required to track RPC activity on a
+// Manager defines the functionality required to track RPC activity on a
 // channel.
-type idlenessManager interface {
-	onCallBegin() error
-	onCallEnd()
-	close()
+type Manager interface {
+	OnCallBegin() error
+	OnCallEnd()
+	Close()
 }
 
-type noopIdlenessManager struct{}
+type noopManager struct{}
 
-func (noopIdlenessManager) onCallBegin() error { return nil }
-func (noopIdlenessManager) onCallEnd()         {}
-func (noopIdlenessManager) close()             {}
+func (noopManager) OnCallBegin() error { return nil }
+func (noopManager) OnCallEnd()         {}
+func (noopManager) Close()             {}
 
-// idlenessManagerImpl implements the idlenessManager interface. It uses atomic
-// operations to synchronize access to shared state and a mutex to guarantee
-// mutual exclusion in a critical section.
-type idlenessManagerImpl struct {
+// manager implements the Manager interface. It uses atomic operations to
+// synchronize access to shared state and a mutex to guarantee mutual exclusion
+// in a critical section.
+type manager struct {
 	// State accessed atomically.
 	lastCallEndTime           int64 // Unix timestamp in nanos; time when the most recent RPC completed.
 	activeCallsCount          int32 // Count of active RPCs; -math.MaxInt32 means channel is idle or is trying to get there.
@@ -64,14 +68,15 @@ type idlenessManagerImpl struct {
 
 	// Can be accessed without atomics or mutex since these are set at creation
 	// time and read-only after that.
-	enforcer idlenessEnforcer // Functionality provided by grpc.ClientConn.
+	enforcer Enforcer // Functionality provided by grpc.ClientConn.
 	timeout  int64    // Idle timeout duration nanos stored as an int64.
+	logger   grpclog.LoggerV2
 
 	// idleMu is used to guarantee mutual exclusion in two scenarios:
 	// - Opposing intentions:
 	//   - a: Idle timeout has fired and handleIdleTimeout() is trying to put
 	//     the channel in idle mode because the channel has been inactive.
-	//   - b: At the same time an RPC is made on the channel, and onCallBegin()
+	//   - b: At the same time an RPC is made on the channel, and OnCallBegin()
 	//     is trying to prevent the channel from going idle.
 	// - Competing intentions:
 	//   - The channel is in idle mode and there are multiple RPCs starting at
@@ -83,28 +88,37 @@ type idlenessManagerImpl struct {
 	timer        *time.Timer
 }
 
-// newIdlenessManager creates a new idleness manager implementation for the
-// given idle timeout.
-func newIdlenessManager(enforcer idlenessEnforcer, idleTimeout time.Duration) idlenessManager {
-	if idleTimeout == 0 {
-		return noopIdlenessManager{}
+// ManagerOptions is a collection of options used by
+// NewManager.
+type ManagerOptions struct {
+	Enforcer Enforcer
+	Timeout  time.Duration
+	Logger   grpclog.LoggerV2
 }
 
-	i := &idlenessManagerImpl{
-		enforcer: enforcer,
-		timeout:  int64(idleTimeout),
+// NewManager creates a new idleness manager implementation for the
+// given idle timeout.
+func NewManager(opts ManagerOptions) Manager {
+	if opts.Timeout == 0 {
+		return noopManager{}
 	}
-	i.timer = timeAfterFunc(idleTimeout, i.handleIdleTimeout)
-	return i
+
+	m := &manager{
+		enforcer: opts.Enforcer,
+		timeout:  int64(opts.Timeout),
+		logger:   opts.Logger,
+	}
+	m.timer = timeAfterFunc(opts.Timeout, m.handleIdleTimeout)
+	return m
 }
 
 // resetIdleTimer resets the idle timer to the given duration. This method
 // should only be called from the timer callback.
-func (i *idlenessManagerImpl) resetIdleTimer(d time.Duration) {
-	i.idleMu.Lock()
-	defer i.idleMu.Unlock()
+func (m *manager) resetIdleTimer(d time.Duration) {
+	m.idleMu.Lock()
+	defer m.idleMu.Unlock()
 
-	if i.timer == nil {
+	if m.timer == nil {
 		// Only close sets timer to nil. We are done.
 		return
 	}
@@ -112,47 +126,47 @@ func (i *idlenessManagerImpl) resetIdleTimer(d time.Duration) {
 	// It is safe to ignore the return value from Reset() because this method is
 	// only ever called from the timer callback, which means the timer has
 	// already fired.
-	i.timer.Reset(d)
+	m.timer.Reset(d)
 }
 
 // handleIdleTimeout is the timer callback that is invoked upon expiry of the
 // configured idle timeout. The channel is considered inactive if there are no
 // ongoing calls and no RPC activity since the last time the timer fired.
-func (i *idlenessManagerImpl) handleIdleTimeout() {
-	if i.isClosed() {
+func (m *manager) handleIdleTimeout() {
+	if m.isClosed() {
 		return
 	}
 
-	if atomic.LoadInt32(&i.activeCallsCount) > 0 {
-		i.resetIdleTimer(time.Duration(i.timeout))
+	if atomic.LoadInt32(&m.activeCallsCount) > 0 {
+		m.resetIdleTimer(time.Duration(m.timeout))
 		return
 	}
 
 	// There has been activity on the channel since we last got here. Reset the
 	// timer and return.
-	if atomic.LoadInt32(&i.activeSinceLastTimerCheck) == 1 {
+	if atomic.LoadInt32(&m.activeSinceLastTimerCheck) == 1 {
 		// Set the timer to fire after a duration of idle timeout, calculated
 		// from the time the most recent RPC completed.
-		atomic.StoreInt32(&i.activeSinceLastTimerCheck, 0)
-		i.resetIdleTimer(time.Duration(atomic.LoadInt64(&i.lastCallEndTime) + i.timeout - time.Now().UnixNano()))
+		atomic.StoreInt32(&m.activeSinceLastTimerCheck, 0)
+		m.resetIdleTimer(time.Duration(atomic.LoadInt64(&m.lastCallEndTime) + m.timeout - time.Now().UnixNano()))
 		return
 	}
 
 	// This CAS operation is extremely likely to succeed given that there has
 	// been no activity since the last time we were here.  Setting the
-	// activeCallsCount to -math.MaxInt32 indicates to onCallBegin() that the
+	// activeCallsCount to -math.MaxInt32 indicates to OnCallBegin() that the
 	// channel is either in idle mode or is trying to get there.
-	if !atomic.CompareAndSwapInt32(&i.activeCallsCount, 0, -math.MaxInt32) {
+	if !atomic.CompareAndSwapInt32(&m.activeCallsCount, 0, -math.MaxInt32) {
 		// This CAS operation can fail if an RPC started after we checked for
 		// activity at the top of this method, or one was ongoing from before
 		// the last time we were here. In both case, reset the timer and return.
-		i.resetIdleTimer(time.Duration(i.timeout))
+		m.resetIdleTimer(time.Duration(m.timeout))
 		return
 	}
 
 	// Now that we've set the active calls count to -math.MaxInt32, it's time to
 	// actually move to idle mode.
-	if i.tryEnterIdleMode() {
+	if m.tryEnterIdleMode() {
 		// Successfully entered idle mode. No timer needed until we exit idle.
 		return
 	}
@@ -160,8 +174,8 @@ func (i *idlenessManagerImpl) handleIdleTimeout() {
 	// Failed to enter idle mode due to a concurrent RPC that kept the channel
 	// active, or because of an error from the channel. Undo the attempt to
 	// enter idle, and reset the timer to try again later.
-	atomic.AddInt32(&i.activeCallsCount, math.MaxInt32)
-	i.resetIdleTimer(time.Duration(i.timeout))
+	atomic.AddInt32(&m.activeCallsCount, math.MaxInt32)
+	m.resetIdleTimer(time.Duration(m.timeout))
 }
 
 // tryEnterIdleMode instructs the channel to enter idle mode. But before
@@ -171,15 +185,15 @@ func (i *idlenessManagerImpl) handleIdleTimeout() {
 // Return value indicates whether or not the channel moved to idle mode.
 //
 // Holds idleMu which ensures mutual exclusion with exitIdleMode.
-func (i *idlenessManagerImpl) tryEnterIdleMode() bool {
-	i.idleMu.Lock()
-	defer i.idleMu.Unlock()
+func (m *manager) tryEnterIdleMode() bool {
+	m.idleMu.Lock()
+	defer m.idleMu.Unlock()
 
-	if atomic.LoadInt32(&i.activeCallsCount) != -math.MaxInt32 {
+	if atomic.LoadInt32(&m.activeCallsCount) != -math.MaxInt32 {
 		// We raced and lost to a new RPC. Very rare, but stop entering idle.
 		return false
 	}
-	if atomic.LoadInt32(&i.activeSinceLastTimerCheck) == 1 {
+	if atomic.LoadInt32(&m.activeSinceLastTimerCheck) == 1 {
 		// An very short RPC could have come in (and also finished) after we
 		// checked for calls count and activity in handleIdleTimeout(), but
 		// before the CAS operation. So, we need to check for activity again.
@@ -189,99 +203,99 @@ func (i *idlenessManagerImpl) tryEnterIdleMode() bool {
 	// No new RPCs have come in since we last set the active calls count value
 	// -math.MaxInt32 in the timer callback. And since we have the lock, it is
 	// safe to enter idle mode now.
-	if err := i.enforcer.enterIdleMode(); err != nil {
-		logger.Errorf("Failed to enter idle mode: %v", err)
+	if err := m.enforcer.EnterIdleMode(); err != nil {
+		m.logger.Errorf("Failed to enter idle mode: %v", err)
 		return false
 	}
 
 	// Successfully entered idle mode.
-	i.actuallyIdle = true
+	m.actuallyIdle = true
 	return true
 }
 
-// onCallBegin is invoked at the start of every RPC.
-func (i *idlenessManagerImpl) onCallBegin() error {
-	if i.isClosed() {
+// OnCallBegin is invoked at the start of every RPC.
+func (m *manager) OnCallBegin() error {
+	if m.isClosed() {
 		return nil
 	}
 
-	if atomic.AddInt32(&i.activeCallsCount, 1) > 0 {
+	if atomic.AddInt32(&m.activeCallsCount, 1) > 0 {
 		// Channel is not idle now. Set the activity bit and allow the call.
-		atomic.StoreInt32(&i.activeSinceLastTimerCheck, 1)
+		atomic.StoreInt32(&m.activeSinceLastTimerCheck, 1)
 		return nil
 	}
 
 	// Channel is either in idle mode or is in the process of moving to idle
 	// mode. Attempt to exit idle mode to allow this RPC.
-	if err := i.exitIdleMode(); err != nil {
+	if err := m.exitIdleMode(); err != nil {
 		// Undo the increment to calls count, and return an error causing the
 		// RPC to fail.
-		atomic.AddInt32(&i.activeCallsCount, -1)
+		atomic.AddInt32(&m.activeCallsCount, -1)
 		return err
 	}
 
-	atomic.StoreInt32(&i.activeSinceLastTimerCheck, 1)
+	atomic.StoreInt32(&m.activeSinceLastTimerCheck, 1)
 	return nil
 }
 
 // exitIdleMode instructs the channel to exit idle mode.
 //
 // Holds idleMu which ensures mutual exclusion with tryEnterIdleMode.
-func (i *idlenessManagerImpl) exitIdleMode() error {
-	i.idleMu.Lock()
-	defer i.idleMu.Unlock()
+func (m *manager) exitIdleMode() error {
+	m.idleMu.Lock()
+	defer m.idleMu.Unlock()
 
-	if !i.actuallyIdle {
+	if !m.actuallyIdle {
 		// This can happen in two scenarios:
 		// - handleIdleTimeout() set the calls count to -math.MaxInt32 and called
 		//   tryEnterIdleMode(). But before the latter could grab the lock, an RPC
-		//   came in and onCallBegin() noticed that the calls count is negative.
+		//   came in and OnCallBegin() noticed that the calls count is negative.
 		// - Channel is in idle mode, and multiple new RPCs come in at the same
-		//   time, all of them notice a negative calls count in onCallBegin and get
+		//   time, all of them notice a negative calls count in OnCallBegin and get
 		//   here. The first one to get the lock would got the channel to exit idle.
 		//
 		// Either way, nothing to do here.
 		return nil
 	}
 
-	if err := i.enforcer.exitIdleMode(); err != nil {
+	if err := m.enforcer.ExitIdleMode(); err != nil {
 		return fmt.Errorf("channel failed to exit idle mode: %v", err)
 	}
 
 	// Undo the idle entry process. This also respects any new RPC attempts.
-	atomic.AddInt32(&i.activeCallsCount, math.MaxInt32)
-	i.actuallyIdle = false
+	atomic.AddInt32(&m.activeCallsCount, math.MaxInt32)
+	m.actuallyIdle = false
 
 	// Start a new timer to fire after the configured idle timeout.
-	i.timer = timeAfterFunc(time.Duration(i.timeout), i.handleIdleTimeout)
+	m.timer = timeAfterFunc(time.Duration(m.timeout), m.handleIdleTimeout)
 	return nil
 }
 
-// onCallEnd is invoked at the end of every RPC.
-func (i *idlenessManagerImpl) onCallEnd() {
-	if i.isClosed() {
+// OnCallEnd is invoked at the end of every RPC.
+func (m *manager) OnCallEnd() {
+	if m.isClosed() {
 		return
 	}
 
 	// Record the time at which the most recent call finished.
-	atomic.StoreInt64(&i.lastCallEndTime, time.Now().UnixNano())
+	atomic.StoreInt64(&m.lastCallEndTime, time.Now().UnixNano())
 
 	// Decrement the active calls count. This count can temporarily go negative
 	// when the timer callback is in the process of moving the channel to idle
 	// mode, but one or more RPCs come in and complete before the timer callback
 	// can get done with the process of moving to idle mode.
-	atomic.AddInt32(&i.activeCallsCount, -1)
+	atomic.AddInt32(&m.activeCallsCount, -1)
 }
 
-func (i *idlenessManagerImpl) isClosed() bool {
-	return atomic.LoadInt32(&i.closed) == 1
+func (m *manager) isClosed() bool {
+	return atomic.LoadInt32(&m.closed) == 1
 }
 
-func (i *idlenessManagerImpl) close() {
-	atomic.StoreInt32(&i.closed, 1)
+func (m *manager) Close() {
+	atomic.StoreInt32(&m.closed, 1)
 
-	i.idleMu.Lock()
-	i.timer.Stop()
-	i.timer = nil
-	i.idleMu.Unlock()
+	m.idleMu.Lock()
+	m.timer.Stop()
+	m.timer = nil
+	m.idleMu.Unlock()
 }

vendor/google.golang.org/grpc/internal/internal.go

@@ -30,7 +30,7 @@ import (
 
 var (
 	// WithHealthCheckFunc is set by dialoptions.go
-	WithHealthCheckFunc interface{} // func (HealthChecker) DialOption
+	WithHealthCheckFunc any // func (HealthChecker) DialOption
 	// HealthCheckFunc is used to provide client-side LB channel health checking
 	HealthCheckFunc HealthChecker
 	// BalancerUnregister is exported by package balancer to unregister a balancer.
@@ -38,8 +38,12 @@ var (
 	// KeepaliveMinPingTime is the minimum ping interval.  This must be 10s by
 	// default, but tests may wish to set it lower for convenience.
 	KeepaliveMinPingTime = 10 * time.Second
+	// KeepaliveMinServerPingTime is the minimum ping interval for servers.
+	// This must be 1s by default, but tests may wish to set it lower for
+	// convenience.
+	KeepaliveMinServerPingTime = time.Second
 	// ParseServiceConfig parses a JSON representation of the service config.
-	ParseServiceConfig interface{} // func(string) *serviceconfig.ParseResult
+	ParseServiceConfig any // func(string) *serviceconfig.ParseResult
 	// EqualServiceConfigForTesting is for testing service config generation and
 	// parsing. Both a and b should be returned by ParseServiceConfig.
 	// This function compares the config without rawJSON stripped, in case the
@@ -49,33 +53,33 @@ var (
 	// given name. This is set by package certprovider for use from xDS
 	// bootstrap code while parsing certificate provider configs in the
 	// bootstrap file.
-	GetCertificateProviderBuilder interface{} // func(string) certprovider.Builder
+	GetCertificateProviderBuilder any // func(string) certprovider.Builder
 	// GetXDSHandshakeInfoForTesting returns a pointer to the xds.HandshakeInfo
 	// stored in the passed in attributes. This is set by
 	// credentials/xds/xds.go.
-	GetXDSHandshakeInfoForTesting interface{} // func (*attributes.Attributes) *xds.HandshakeInfo
+	GetXDSHandshakeInfoForTesting any // func (*attributes.Attributes) *xds.HandshakeInfo
 	// GetServerCredentials returns the transport credentials configured on a
 	// gRPC server. An xDS-enabled server needs to know what type of credentials
 	// is configured on the underlying gRPC server. This is set by server.go.
-	GetServerCredentials interface{} // func (*grpc.Server) credentials.TransportCredentials
+	GetServerCredentials any // func (*grpc.Server) credentials.TransportCredentials
 	// CanonicalString returns the canonical string of the code defined here:
 	// https://github.com/grpc/grpc/blob/master/doc/statuscodes.md.
 	//
 	// This is used in the 1.0 release of gcp/observability, and thus must not be
 	// deleted or changed.
-	CanonicalString interface{} // func (codes.Code) string
+	CanonicalString any // func (codes.Code) string
 	// DrainServerTransports initiates a graceful close of existing connections
 	// on a gRPC server accepted on the provided listener address. An
 	// xDS-enabled server invokes this method on a grpc.Server when a particular
 	// listener moves to "not-serving" mode.
-	DrainServerTransports interface{} // func(*grpc.Server, string)
+	DrainServerTransports any // func(*grpc.Server, string)
 	// AddGlobalServerOptions adds an array of ServerOption that will be
 	// effective globally for newly created servers. The priority will be: 1.
 	// user-provided; 2. this method; 3. default values.
 	//
 	// This is used in the 1.0 release of gcp/observability, and thus must not be
 	// deleted or changed.
-	AddGlobalServerOptions interface{} // func(opt ...ServerOption)
+	AddGlobalServerOptions any // func(opt ...ServerOption)
 	// ClearGlobalServerOptions clears the array of extra ServerOption. This
 	// method is useful in testing and benchmarking.
 	//
@@ -88,14 +92,14 @@ var (
 	//
 	// This is used in the 1.0 release of gcp/observability, and thus must not be
 	// deleted or changed.
-	AddGlobalDialOptions interface{} // func(opt ...DialOption)
+	AddGlobalDialOptions any // func(opt ...DialOption)
 	// DisableGlobalDialOptions returns a DialOption that prevents the
 	// ClientConn from applying the global DialOptions (set via
 	// AddGlobalDialOptions).
 	//
 	// This is used in the 1.0 release of gcp/observability, and thus must not be
 	// deleted or changed.
-	DisableGlobalDialOptions interface{} // func() grpc.DialOption
+	DisableGlobalDialOptions any // func() grpc.DialOption
 	// ClearGlobalDialOptions clears the array of extra DialOption. This
 	// method is useful in testing and benchmarking.
 	//
@@ -104,23 +108,26 @@ var (
 	ClearGlobalDialOptions func()
 	// JoinDialOptions combines the dial options passed as arguments into a
 	// single dial option.
-	JoinDialOptions interface{} // func(...grpc.DialOption) grpc.DialOption
+	JoinDialOptions any // func(...grpc.DialOption) grpc.DialOption
 	// JoinServerOptions combines the server options passed as arguments into a
 	// single server option.
-	JoinServerOptions interface{} // func(...grpc.ServerOption) grpc.ServerOption
+	JoinServerOptions any // func(...grpc.ServerOption) grpc.ServerOption
 
 	// WithBinaryLogger returns a DialOption that specifies the binary logger
 	// for a ClientConn.
 	//
 	// This is used in the 1.0 release of gcp/observability, and thus must not be
 	// deleted or changed.
-	WithBinaryLogger interface{} // func(binarylog.Logger) grpc.DialOption
+	WithBinaryLogger any // func(binarylog.Logger) grpc.DialOption
 	// BinaryLogger returns a ServerOption that can set the binary logger for a
 	// server.
 	//
 	// This is used in the 1.0 release of gcp/observability, and thus must not be
 	// deleted or changed.
-	BinaryLogger interface{} // func(binarylog.Logger) grpc.ServerOption
+	BinaryLogger any // func(binarylog.Logger) grpc.ServerOption
+
+	// SubscribeToConnectivityStateChanges adds a grpcsync.Subscriber to a provided grpc.ClientConn
+	SubscribeToConnectivityStateChanges any // func(*grpc.ClientConn, grpcsync.Subscriber)
 
 	// NewXDSResolverWithConfigForTesting creates a new xds resolver builder using
 	// the provided xds bootstrap config instead of the global configuration from
@@ -131,7 +138,7 @@ var (
 	//
 	// This function should ONLY be used for testing and may not work with some
 	// other features, including the CSDS service.
-	NewXDSResolverWithConfigForTesting interface{} // func([]byte) (resolver.Builder, error)
+	NewXDSResolverWithConfigForTesting any // func([]byte) (resolver.Builder, error)
 
 	// RegisterRLSClusterSpecifierPluginForTesting registers the RLS Cluster
 	// Specifier Plugin for testing purposes, regardless of the XDSRLS environment
@@ -163,7 +170,11 @@ var (
 	UnregisterRBACHTTPFilterForTesting func()
 
 	// ORCAAllowAnyMinReportingInterval is for examples/orca use ONLY.
-	ORCAAllowAnyMinReportingInterval interface{} // func(so *orca.ServiceOptions)
+	ORCAAllowAnyMinReportingInterval any // func(so *orca.ServiceOptions)
+
+	// GRPCResolverSchemeExtraMetadata determines when gRPC will add extra
+	// metadata to RPCs.
+	GRPCResolverSchemeExtraMetadata string = "xds"
 )
 
 // HealthChecker defines the signature of the client-side LB channel health checking function.
@@ -174,7 +185,7 @@ var (
 //
 // The health checking protocol is defined at:
 // https://github.com/grpc/grpc/blob/master/doc/health-checking.md
-type HealthChecker func(ctx context.Context, newStream func(string) (interface{}, error), setConnectivityState func(connectivity.State, error), serviceName string) error
+type HealthChecker func(ctx context.Context, newStream func(string) (any, error), setConnectivityState func(connectivity.State, error), serviceName string) error
 
 const (
 	// CredsBundleModeFallback switches GoogleDefaultCreds to fallback mode.

vendor/google.golang.org/grpc/internal/metadata/metadata.go

@@ -35,7 +35,7 @@ const mdKey = mdKeyType("grpc.internal.address.metadata")
 
 type mdValue metadata.MD
 
-func (m mdValue) Equal(o interface{}) bool {
+func (m mdValue) Equal(o any) bool {
 	om, ok := o.(mdValue)
 	if !ok {
 		return false

vendor/google.golang.org/grpc/internal/pretty/pretty.go

@@ -35,7 +35,7 @@ const jsonIndent = "  "
 // ToJSON marshals the input into a json string.
 //
 // If marshal fails, it falls back to fmt.Sprintf("%+v").
-func ToJSON(e interface{}) string {
+func ToJSON(e any) string {
 	switch ee := e.(type) {
 	case protov1.Message:
 		mm := jsonpb.Marshaler{Indent: jsonIndent}

vendor/google.golang.org/grpc/internal/resolver/config_selector.go

@@ -92,7 +92,7 @@ type ClientStream interface {
 	// calling RecvMsg on the same stream at the same time, but it is not safe
 	// to call SendMsg on the same stream in different goroutines. It is also
 	// not safe to call CloseSend concurrently with SendMsg.
-	SendMsg(m interface{}) error
+	SendMsg(m any) error
 	// RecvMsg blocks until it receives a message into m or the stream is
 	// done. It returns io.EOF when the stream completes successfully. On
 	// any other error, the stream is aborted and the error contains the RPC
@@ -101,7 +101,7 @@ type ClientStream interface {
 	// It is safe to have a goroutine calling SendMsg and another goroutine
 	// calling RecvMsg on the same stream at the same time, but it is not
 	// safe to call RecvMsg on the same stream in different goroutines.
-	RecvMsg(m interface{}) error
+	RecvMsg(m any) error
 }
 
 // ClientInterceptor is an interceptor for gRPC client streams.

vendor/google.golang.org/grpc/internal/resolver/dns/dns_resolver.go

@@ -62,7 +62,8 @@ const (
 	defaultPort       = "443"
 	defaultDNSSvrPort = "53"
 	golang            = "GO"
-	// txtPrefix is the prefix string to be prepended to the host name for txt record lookup.
+	// txtPrefix is the prefix string to be prepended to the host name for txt
+	// record lookup.
 	txtPrefix = "_grpc_config."
 	// In DNS, service config is encoded in a TXT record via the mechanism
 	// described in RFC-1464 using the attribute name grpc_config.
@@ -86,14 +87,14 @@ var (
 	minDNSResRate = 30 * time.Second
 )
 
-var customAuthorityDialler = func(authority string) func(ctx context.Context, network, address string) (net.Conn, error) {
-	return func(ctx context.Context, network, address string) (net.Conn, error) {
+var addressDialer = func(address string) func(context.Context, string, string) (net.Conn, error) {
+	return func(ctx context.Context, network, _ string) (net.Conn, error) {
 		var dialer net.Dialer
-		return dialer.DialContext(ctx, network, authority)
+		return dialer.DialContext(ctx, network, address)
 	}
 }
 
-var customAuthorityResolver = func(authority string) (netResolver, error) {
+var newNetResolver = func(authority string) (netResolver, error) {
 	host, port, err := parseTarget(authority, defaultDNSSvrPort)
 	if err != nil {
 		return nil, err
@@ -103,7 +104,7 @@ var customAuthorityResolver = func(authority string) (netResolver, error) {
 
 	return &net.Resolver{
 		PreferGo: true,
-		Dial:     customAuthorityDialler(authorityWithPort),
+		Dial:     addressDialer(authorityWithPort),
 	}, nil
 }
 
@@ -114,7 +115,8 @@ func NewBuilder() resolver.Builder {
 
 type dnsBuilder struct{}
 
-// Build creates and starts a DNS resolver that watches the name resolution of the target.
+// Build creates and starts a DNS resolver that watches the name resolution of
+// the target.
 func (b *dnsBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) {
 	host, port, err := parseTarget(target.Endpoint(), defaultPort)
 	if err != nil {
@@ -143,7 +145,7 @@ func (b *dnsBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts
 	if target.URL.Host == "" {
 		d.resolver = defaultResolver
 	} else {
-		d.resolver, err = customAuthorityResolver(target.URL.Host)
+		d.resolver, err = newNetResolver(target.URL.Host)
 		if err != nil {
 			return nil, err
 		}
@@ -180,19 +182,22 @@ type dnsResolver struct {
 	ctx      context.Context
 	cancel   context.CancelFunc
 	cc       resolver.ClientConn
-	// rn channel is used by ResolveNow() to force an immediate resolution of the target.
+	// rn channel is used by ResolveNow() to force an immediate resolution of the
+	// target.
 	rn chan struct{}
-	// wg is used to enforce Close() to return after the watcher() goroutine has finished.
-	// Otherwise, data race will be possible. [Race Example] in dns_resolver_test we
-	// replace the real lookup functions with mocked ones to facilitate testing.
-	// If Close() doesn't wait for watcher() goroutine finishes, race detector sometimes
-	// will warns lookup (READ the lookup function pointers) inside watcher() goroutine
-	// has data race with replaceNetFunc (WRITE the lookup function pointers).
+	// wg is used to enforce Close() to return after the watcher() goroutine has
+	// finished. Otherwise, data race will be possible. [Race Example] in
+	// dns_resolver_test we replace the real lookup functions with mocked ones to
+	// facilitate testing. If Close() doesn't wait for watcher() goroutine
+	// finishes, race detector sometimes will warns lookup (READ the lookup
+	// function pointers) inside watcher() goroutine has data race with
+	// replaceNetFunc (WRITE the lookup function pointers).
 	wg                   sync.WaitGroup
 	disableServiceConfig bool
 }
 
-// ResolveNow invoke an immediate resolution of the target that this dnsResolver watches.
+// ResolveNow invoke an immediate resolution of the target that this
+// dnsResolver watches.
 func (d *dnsResolver) ResolveNow(resolver.ResolveNowOptions) {
 	select {
 	case d.rn <- struct{}{}:
@@ -220,8 +225,8 @@ func (d *dnsResolver) watcher() {
 
 		var timer *time.Timer
 		if err == nil {
-			// Success resolving, wait for the next ResolveNow. However, also wait 30 seconds at the very least
-			// to prevent constantly re-resolving.
+			// Success resolving, wait for the next ResolveNow. However, also wait 30
+			// seconds at the very least to prevent constantly re-resolving.
 			backoffIndex = 1
 			timer = newTimerDNSResRate(minDNSResRate)
 			select {
@@ -231,7 +236,8 @@ func (d *dnsResolver) watcher() {
 			case <-d.rn:
 			}
 		} else {
-			// Poll on an error found in DNS Resolver or an error received from ClientConn.
+			// Poll on an error found in DNS Resolver or an error received from
+			// ClientConn.
 			timer = newTimer(backoff.DefaultExponential.Backoff(backoffIndex))
 			backoffIndex++
 		}
@@ -278,7 +284,8 @@ func (d *dnsResolver) lookupSRV() ([]resolver.Address, error) {
 }
 
 func handleDNSError(err error, lookupType string) error {
-	if dnsErr, ok := err.(*net.DNSError); ok && !dnsErr.IsTimeout && !dnsErr.IsTemporary {
+	dnsErr, ok := err.(*net.DNSError)
+	if ok && !dnsErr.IsTimeout && !dnsErr.IsTemporary {
 		// Timeouts and temporary errors should be communicated to gRPC to
 		// attempt another DNS query (with backoff).  Other errors should be
 		// suppressed (they may represent the absence of a TXT record).
@@ -307,10 +314,12 @@ func (d *dnsResolver) lookupTXT() *serviceconfig.ParseResult {
 		res += s
 	}
 
-	// TXT record must have "grpc_config=" attribute in order to be used as service config.
+	// TXT record must have "grpc_config=" attribute in order to be used as
+	// service config.
 	if !strings.HasPrefix(res, txtAttribute) {
 		logger.Warningf("dns: TXT record %v missing %v attribute", res, txtAttribute)
-		// This is not an error; it is the equivalent of not having a service config.
+		// This is not an error; it is the equivalent of not having a service
+		// config.
 		return nil
 	}
 	sc := canaryingSC(strings.TrimPrefix(res, txtAttribute))
@@ -352,9 +361,10 @@ func (d *dnsResolver) lookup() (*resolver.State, error) {
 	return &state, nil
 }
 
-// formatIP returns ok = false if addr is not a valid textual representation of an IP address.
-// If addr is an IPv4 address, return the addr and ok = true.
-// If addr is an IPv6 address, return the addr enclosed in square brackets and ok = true.
+// formatIP returns ok = false if addr is not a valid textual representation of
+// an IP address. If addr is an IPv4 address, return the addr and ok = true.
+// If addr is an IPv6 address, return the addr enclosed in square brackets and
+// ok = true.
 func formatIP(addr string) (addrIP string, ok bool) {
 	ip := net.ParseIP(addr)
 	if ip == nil {
@@ -366,10 +376,10 @@ func formatIP(addr string) (addrIP string, ok bool) {
 	return "[" + addr + "]", true
 }
 
-// parseTarget takes the user input target string and default port, returns formatted host and port info.
-// If target doesn't specify a port, set the port to be the defaultPort.
-// If target is in IPv6 format and host-name is enclosed in square brackets, brackets
-// are stripped when setting the host.
+// parseTarget takes the user input target string and default port, returns
+// formatted host and port info. If target doesn't specify a port, set the port
+// to be the defaultPort. If target is in IPv6 format and host-name is enclosed
+// in square brackets, brackets are stripped when setting the host.
 // examples:
 // target: "www.google.com" defaultPort: "443" returns host: "www.google.com", port: "443"
 // target: "ipv4-host:80" defaultPort: "443" returns host: "ipv4-host", port: "80"
@@ -385,12 +395,14 @@ func parseTarget(target, defaultPort string) (host, port string, err error) {
 	}
 	if host, port, err = net.SplitHostPort(target); err == nil {
 		if port == "" {
-			// If the port field is empty (target ends with colon), e.g. "[::1]:", this is an error.
+			// If the port field is empty (target ends with colon), e.g. "[::1]:",
+			// this is an error.
 			return "", "", errEndsWithColon
 		}
 		// target has port, i.e ipv4-host:port, [ipv6-host]:port, host-name:port
 		if host == "" {
-			// Keep consistent with net.Dial(): If the host is empty, as in ":80", the local system is assumed.
+			// Keep consistent with net.Dial(): If the host is empty, as in ":80",
+			// the local system is assumed.
 			host = "localhost"
 		}
 		return host, port, nil

vendor/google.golang.org/grpc/internal/status/status.go

@@ -49,7 +49,7 @@ func New(c codes.Code, msg string) *Status {
 }
 
 // Newf returns New(c, fmt.Sprintf(format, a...)).
-func Newf(c codes.Code, format string, a ...interface{}) *Status {
+func Newf(c codes.Code, format string, a ...any) *Status {
 	return New(c, fmt.Sprintf(format, a...))
 }
 
@@ -64,7 +64,7 @@ func Err(c codes.Code, msg string) error {
 }
 
 // Errorf returns Error(c, fmt.Sprintf(format, a...)).
-func Errorf(c codes.Code, format string, a ...interface{}) error {
+func Errorf(c codes.Code, format string, a ...any) error {
 	return Err(c, fmt.Sprintf(format, a...))
 }
 
@@ -120,11 +120,11 @@ func (s *Status) WithDetails(details ...proto.Message) (*Status, error) {
 
 // Details returns a slice of details messages attached to the status.
 // If a detail cannot be decoded, the error is returned in place of the detail.
-func (s *Status) Details() []interface{} {
+func (s *Status) Details() []any {
 	if s == nil || s.s == nil {
 		return nil
 	}
-	details := make([]interface{}, 0, len(s.s.Details))
+	details := make([]any, 0, len(s.s.Details))
 	for _, any := range s.s.Details {
 		detail := &ptypes.DynamicAny{}
 		if err := ptypes.UnmarshalAny(any, detail); err != nil {

vendor/google.golang.org/grpc/internal/transport/controlbuf.go

@@ -40,7 +40,7 @@ var updateHeaderTblSize = func(e *hpack.Encoder, v uint32) {
 }
 
 type itemNode struct {
-	it   interface{}
+	it   any
 	next *itemNode
 }
 
@@ -49,7 +49,7 @@ type itemList struct {
 	tail *itemNode
 }
 
-func (il *itemList) enqueue(i interface{}) {
+func (il *itemList) enqueue(i any) {
 	n := &itemNode{it: i}
 	if il.tail == nil {
 		il.head, il.tail = n, n
@@ -61,11 +61,11 @@ func (il *itemList) enqueue(i interface{}) {
 
 // peek returns the first item in the list without removing it from the
 // list.
-func (il *itemList) peek() interface{} {
+func (il *itemList) peek() any {
 	return il.head.it
 }
 
-func (il *itemList) dequeue() interface{} {
+func (il *itemList) dequeue() any {
 	if il.head == nil {
 		return nil
 	}
@@ -336,7 +336,7 @@ func (c *controlBuffer) put(it cbItem) error {
 	return err
 }
 
-func (c *controlBuffer) executeAndPut(f func(it interface{}) bool, it cbItem) (bool, error) {
+func (c *controlBuffer) executeAndPut(f func(it any) bool, it cbItem) (bool, error) {
 	var wakeUp bool
 	c.mu.Lock()
 	if c.err != nil {
@@ -373,7 +373,7 @@ func (c *controlBuffer) executeAndPut(f func(it interface{}) bool, it cbItem) (b
 }
 
 // Note argument f should never be nil.
-func (c *controlBuffer) execute(f func(it interface{}) bool, it interface{}) (bool, error) {
+func (c *controlBuffer) execute(f func(it any) bool, it any) (bool, error) {
 	c.mu.Lock()
 	if c.err != nil {
 		c.mu.Unlock()
@@ -387,7 +387,7 @@ func (c *controlBuffer) execute(f func(it interface{}) bool, it interface{}) (bo
 	return true, nil
 }
 
-func (c *controlBuffer) get(block bool) (interface{}, error) {
+func (c *controlBuffer) get(block bool) (any, error) {
 	for {
 		c.mu.Lock()
 		if c.err != nil {
@@ -830,7 +830,7 @@ func (l *loopyWriter) goAwayHandler(g *goAway) error {
 	return nil
 }
 
-func (l *loopyWriter) handle(i interface{}) error {
+func (l *loopyWriter) handle(i any) error {
 	switch i := i.(type) {
 	case *incomingWindowUpdate:
 		l.incomingWindowUpdateHandler(i)

vendor/google.golang.org/grpc/internal/transport/http2_client.go

@@ -330,7 +330,7 @@ func newHTTP2Client(connectCtx, ctx context.Context, addr resolver.Address, opts
 		readerDone:            make(chan struct{}),
 		writerDone:            make(chan struct{}),
 		goAway:                make(chan struct{}),
-		framer:                newFramer(conn, writeBufSize, readBufSize, maxHeaderListSize),
+		framer:                newFramer(conn, writeBufSize, readBufSize, opts.SharedWriteBuffer, maxHeaderListSize),
 		fc:                    &trInFlow{limit: uint32(icwz)},
 		scheme:                scheme,
 		activeStreams:         make(map[uint32]*Stream),
@@ -762,7 +762,7 @@ func (t *http2Client) NewStream(ctx context.Context, callHdr *CallHdr) (*Stream,
 	firstTry := true
 	var ch chan struct{}
 	transportDrainRequired := false
-	checkForStreamQuota := func(it interface{}) bool {
+	checkForStreamQuota := func(it any) bool {
 		if t.streamQuota <= 0 { // Can go negative if server decreases it.
 			if firstTry {
 				t.waitingStreams++
@@ -800,7 +800,7 @@ func (t *http2Client) NewStream(ctx context.Context, callHdr *CallHdr) (*Stream,
 		return true
 	}
 	var hdrListSizeErr error
-	checkForHeaderListSize := func(it interface{}) bool {
+	checkForHeaderListSize := func(it any) bool {
 		if t.maxSendHeaderListSize == nil {
 			return true
 		}
@@ -815,7 +815,7 @@ func (t *http2Client) NewStream(ctx context.Context, callHdr *CallHdr) (*Stream,
 		return true
 	}
 	for {
-		success, err := t.controlBuf.executeAndPut(func(it interface{}) bool {
+		success, err := t.controlBuf.executeAndPut(func(it any) bool {
 			return checkForHeaderListSize(it) && checkForStreamQuota(it)
 		}, hdr)
 		if err != nil {
@@ -927,7 +927,7 @@ func (t *http2Client) closeStream(s *Stream, err error, rst bool, rstCode http2.
 		rst:     rst,
 		rstCode: rstCode,
 	}
-	addBackStreamQuota := func(interface{}) bool {
+	addBackStreamQuota := func(any) bool {
 		t.streamQuota++
 		if t.streamQuota > 0 && t.waitingStreams > 0 {
 			select {
@@ -1080,7 +1080,7 @@ func (t *http2Client) updateWindow(s *Stream, n uint32) {
 // for the transport and the stream based on the current bdp
 // estimation.
 func (t *http2Client) updateFlowControl(n uint32) {
-	updateIWS := func(interface{}) bool {
+	updateIWS := func(any) bool {
 		t.initialWindowSize = int32(n)
 		t.mu.Lock()
 		for _, s := range t.activeStreams {
@@ -1233,7 +1233,7 @@ func (t *http2Client) handleSettings(f *http2.SettingsFrame, isFirst bool) {
 		}
 		updateFuncs = append(updateFuncs, updateStreamQuota)
 	}
-	t.controlBuf.executeAndPut(func(interface{}) bool {
+	t.controlBuf.executeAndPut(func(any) bool {
 		for _, f := range updateFuncs {
 			f()
 		}
@@ -1505,14 +1505,15 @@ func (t *http2Client) operateHeaders(frame *http2.MetaHeadersFrame) {
 		return
 	}
 
-	isHeader := false
-
-	// If headerChan hasn't been closed yet
+	// For headers, set them in s.header and close headerChan.  For trailers or
+	// trailers-only, closeStream will set the trailers and close headerChan as
+	// needed.
+	if !endStream {
+		// If headerChan hasn't been closed yet (expected, given we checked it
+		// above, but something else could have potentially closed the whole
+		// stream).
 		if atomic.CompareAndSwapUint32(&s.headerChanClosed, 0, 1) {
 			s.headerValid = true
-		if !endStream {
-			// HEADERS frame block carries a Response-Headers.
-			isHeader = true
 			// These values can be set without any synchronization because
 			// stream goroutine will read it only after seeing a closed
 			// headerChan which we'll close after setting this.
@@ -1520,15 +1521,12 @@ func (t *http2Client) operateHeaders(frame *http2.MetaHeadersFrame) {
 			if len(mdata) > 0 {
 				s.header = mdata
 			}
-		} else {
-			// HEADERS frame block carries a Trailers-Only.
-			s.noHeaders = true
-		}
 			close(s.headerChan)
 		}
+	}
 
 	for _, sh := range t.statsHandlers {
-		if isHeader {
+		if !endStream {
 			inHeader := &stats.InHeader{
 				Client:      true,
 				WireLength:  int(frame.Header().Length),
@@ -1554,9 +1552,10 @@ func (t *http2Client) operateHeaders(frame *http2.MetaHeadersFrame) {
 		statusGen = status.New(rawStatusCode, grpcMessage)
 	}
 
-	// if client received END_STREAM from server while stream was still active, send RST_STREAM
-	rst := s.getState() == streamActive
-	t.closeStream(s, io.EOF, rst, http2.ErrCodeNo, statusGen, mdata, true)
+	// If client received END_STREAM from server while stream was still active,
+	// send RST_STREAM.
+	rstStream := s.getState() == streamActive
+	t.closeStream(s, io.EOF, rstStream, http2.ErrCodeNo, statusGen, mdata, true)
 }
 
 // readServerPreface reads and handles the initial settings frame from the

vendor/google.golang.org/grpc/internal/transport/http2_server.go

@@ -165,7 +165,7 @@ func NewServerTransport(conn net.Conn, config *ServerConfig) (_ ServerTransport,
 	if config.MaxHeaderListSize != nil {
 		maxHeaderListSize = *config.MaxHeaderListSize
 	}
-	framer := newFramer(conn, writeBufSize, readBufSize, maxHeaderListSize)
+	framer := newFramer(conn, writeBufSize, readBufSize, config.SharedWriteBuffer, maxHeaderListSize)
 	// Send initial settings as connection preface to client.
 	isettings := []http2.Setting{{
 		ID:  http2.SettingMaxFrameSize,
@@ -233,7 +233,7 @@ func NewServerTransport(conn net.Conn, config *ServerConfig) (_ ServerTransport,
 		kp.Timeout = defaultServerKeepaliveTimeout
 	}
 	if kp.Time != infinity {
-		if err = syscall.SetTCPUserTimeout(conn, kp.Timeout); err != nil {
+		if err = syscall.SetTCPUserTimeout(rawConn, kp.Timeout); err != nil {
 			return nil, connectionErrorf(false, err, "transport: failed to set TCP_USER_TIMEOUT: %v", err)
 		}
 	}
@@ -850,7 +850,7 @@ func (t *http2Server) handleSettings(f *http2.SettingsFrame) {
 		}
 		return nil
 	})
-	t.controlBuf.executeAndPut(func(interface{}) bool {
+	t.controlBuf.executeAndPut(func(any) bool {
 		for _, f := range updateFuncs {
 			f()
 		}
@@ -934,7 +934,7 @@ func appendHeaderFieldsFromMD(headerFields []hpack.HeaderField, md metadata.MD)
 	return headerFields
 }
 
-func (t *http2Server) checkForHeaderListSize(it interface{}) bool {
+func (t *http2Server) checkForHeaderListSize(it any) bool {
 	if t.maxSendHeaderListSize == nil {
 		return true
 	}

vendor/google.golang.org/grpc/internal/transport/http_util.go

@@ -30,6 +30,7 @@ import (
 	"net/url"
 	"strconv"
 	"strings"
+	"sync"
 	"time"
 	"unicode/utf8"
 
@@ -309,6 +310,7 @@ func decodeGrpcMessageUnchecked(msg string) string {
 }
 
 type bufWriter struct {
+	pool      *sync.Pool
 	buf       []byte
 	offset    int
 	batchSize int
@@ -316,12 +318,17 @@ type bufWriter struct {
 	err       error
 }
 
-func newBufWriter(conn net.Conn, batchSize int) *bufWriter {
-	return &bufWriter{
-		buf:       make([]byte, batchSize*2),
+func newBufWriter(conn net.Conn, batchSize int, pool *sync.Pool) *bufWriter {
+	w := &bufWriter{
 		batchSize: batchSize,
 		conn:      conn,
+		pool:      pool,
 	}
+	// this indicates that we should use non shared buf
+	if pool == nil {
+		w.buf = make([]byte, batchSize)
+	}
+	return w
 }
 
 func (w *bufWriter) Write(b []byte) (n int, err error) {
@@ -332,19 +339,34 @@ func (w *bufWriter) Write(b []byte) (n int, err error) {
 		n, err = w.conn.Write(b)
 		return n, toIOError(err)
 	}
+	if w.buf == nil {
+		b := w.pool.Get().(*[]byte)
+		w.buf = *b
+	}
 	for len(b) > 0 {
 		nn := copy(w.buf[w.offset:], b)
 		b = b[nn:]
 		w.offset += nn
 		n += nn
 		if w.offset >= w.batchSize {
-			err = w.Flush()
+			err = w.flushKeepBuffer()
 		}
 	}
 	return n, err
 }
 
 func (w *bufWriter) Flush() error {
+	err := w.flushKeepBuffer()
+	// Only release the buffer if we are in a "shared" mode
+	if w.buf != nil && w.pool != nil {
+		b := w.buf
+		w.pool.Put(&b)
+		w.buf = nil
+	}
+	return err
+}
+
+func (w *bufWriter) flushKeepBuffer() error {
 	if w.err != nil {
 		return w.err
 	}
@@ -381,7 +403,10 @@ type framer struct {
 	fr     *http2.Framer
 }
 
-func newFramer(conn net.Conn, writeBufferSize, readBufferSize int, maxHeaderListSize uint32) *framer {
+var writeBufferPoolMap map[int]*sync.Pool = make(map[int]*sync.Pool)
+var writeBufferMutex sync.Mutex
+
+func newFramer(conn net.Conn, writeBufferSize, readBufferSize int, sharedWriteBuffer bool, maxHeaderListSize uint32) *framer {
 	if writeBufferSize < 0 {
 		writeBufferSize = 0
 	}
@@ -389,7 +414,11 @@ func newFramer(conn net.Conn, writeBufferSize, readBufferSize int, maxHeaderList
 	if readBufferSize > 0 {
 		r = bufio.NewReaderSize(r, readBufferSize)
 	}
-	w := newBufWriter(conn, writeBufferSize)
+	var pool *sync.Pool
+	if sharedWriteBuffer {
+		pool = getWriteBufferPool(writeBufferSize)
+	}
+	w := newBufWriter(conn, writeBufferSize, pool)
 	f := &framer{
 		writer: w,
 		fr:     http2.NewFramer(w, r),
@@ -403,6 +432,24 @@ func newFramer(conn net.Conn, writeBufferSize, readBufferSize int, maxHeaderList
 	return f
 }
 
+func getWriteBufferPool(writeBufferSize int) *sync.Pool {
+	writeBufferMutex.Lock()
+	defer writeBufferMutex.Unlock()
+	size := writeBufferSize * 2
+	pool, ok := writeBufferPoolMap[size]
+	if ok {
+		return pool
+	}
+	pool = &sync.Pool{
+		New: func() any {
+			b := make([]byte, size)
+			return &b
+		},
+	}
+	writeBufferPoolMap[size] = pool
+	return pool
+}
+
 // parseDialTarget returns the network and address to pass to dialer.
 func parseDialTarget(target string) (string, string) {
 	net := "tcp"

vendor/google.golang.org/grpc/internal/transport/transport.go

@@ -43,10 +43,6 @@ import (
 	"google.golang.org/grpc/tap"
 )
 
-// ErrNoHeaders is used as a signal that a trailers only response was received,
-// and is not a real error.
-var ErrNoHeaders = errors.New("stream has no headers")
-
 const logLevel = 2
 
 type bufferPool struct {
@@ -56,7 +52,7 @@ type bufferPool struct {
 func newBufferPool() *bufferPool {
 	return &bufferPool{
 		pool: sync.Pool{
-			New: func() interface{} {
+			New: func() any {
 				return new(bytes.Buffer)
 			},
 		},
@@ -390,14 +386,10 @@ func (s *Stream) Header() (metadata.MD, error) {
 	}
 	s.waitOnHeader()
 
-	if !s.headerValid {
+	if !s.headerValid || s.noHeaders {
 		return nil, s.status.Err()
 	}
 
-	if s.noHeaders {
-		return nil, ErrNoHeaders
-	}
-
 	return s.header.Copy(), nil
 }
 
@@ -559,6 +551,7 @@ type ServerConfig struct {
 	InitialConnWindowSize int32
 	WriteBufferSize       int
 	ReadBufferSize        int
+	SharedWriteBuffer     bool
 	ChannelzParentID      *channelz.Identifier
 	MaxHeaderListSize     *uint32
 	HeaderTableSize       *uint32
@@ -592,6 +585,8 @@ type ConnectOptions struct {
 	WriteBufferSize int
 	// ReadBufferSize sets the size of read buffer, which in turn determines how much data can be read at most for one read syscall.
 	ReadBufferSize int
+	// SharedWriteBuffer indicates whether connections should reuse write buffer
+	SharedWriteBuffer bool
 	// ChannelzParentID sets the addrConn id which initiate the creation of this client transport.
 	ChannelzParentID *channelz.Identifier
 	// MaxHeaderListSize sets the max (uncompressed) size of header list that is prepared to be received.
@@ -736,7 +731,7 @@ type ServerTransport interface {
 }
 
 // connectionErrorf creates an ConnectionError with the specified error description.
-func connectionErrorf(temp bool, e error, format string, a ...interface{}) ConnectionError {
+func connectionErrorf(temp bool, e error, format string, a ...any) ConnectionError {
 	return ConnectionError{
 		Desc: fmt.Sprintf(format, a...),
 		temp: temp,

vendor/google.golang.org/grpc/picker_wrapper.go

@@ -28,6 +28,7 @@ import (
 	"google.golang.org/grpc/internal/channelz"
 	istatus "google.golang.org/grpc/internal/status"
 	"google.golang.org/grpc/internal/transport"
+	"google.golang.org/grpc/stats"
 	"google.golang.org/grpc/status"
 )
 
@@ -39,10 +40,14 @@ type pickerWrapper struct {
 	idle          bool
 	blockingCh    chan struct{}
 	picker        balancer.Picker
+	statsHandlers []stats.Handler // to record blocking picker calls
 }
 
-func newPickerWrapper() *pickerWrapper {
-	return &pickerWrapper{blockingCh: make(chan struct{})}
+func newPickerWrapper(statsHandlers []stats.Handler) *pickerWrapper {
+	return &pickerWrapper{
+		blockingCh:    make(chan struct{}),
+		statsHandlers: statsHandlers,
+	}
 }
 
 // updatePicker is called by UpdateBalancerState. It unblocks all blocked pick.
@@ -95,6 +100,7 @@ func (pw *pickerWrapper) pick(ctx context.Context, failfast bool, info balancer.
 	var ch chan struct{}
 
 	var lastPickErr error
+
 	for {
 		pw.mu.Lock()
 		if pw.done {
@@ -129,6 +135,20 @@ func (pw *pickerWrapper) pick(ctx context.Context, failfast bool, info balancer.
 			continue
 		}
 
+		// If the channel is set, it means that the pick call had to wait for a
+		// new picker at some point. Either it's the first iteration and this
+		// function received the first picker, or a picker errored with
+		// ErrNoSubConnAvailable or errored with failfast set to false, which
+		// will trigger a continue to the next iteration. In the first case this
+		// conditional will hit if this call had to block (the channel is set).
+		// In the second case, the only way it will get to this conditional is
+		// if there is a new picker.
+		if ch != nil {
+			for _, sh := range pw.statsHandlers {
+				sh.HandleRPC(ctx, &stats.PickerUpdated{})
+			}
+		}
+
 		ch = pw.blockingCh
 		p := pw.picker
 		pw.mu.Unlock()

vendor/google.golang.org/grpc/pickfirst.go

@@ -26,12 +26,18 @@ import (
 	"google.golang.org/grpc/balancer"
 	"google.golang.org/grpc/connectivity"
 	"google.golang.org/grpc/internal/envconfig"
+	internalgrpclog "google.golang.org/grpc/internal/grpclog"
 	"google.golang.org/grpc/internal/grpcrand"
+	"google.golang.org/grpc/internal/pretty"
+	"google.golang.org/grpc/resolver"
 	"google.golang.org/grpc/serviceconfig"
 )
 
+const (
 	// PickFirstBalancerName is the name of the pick_first balancer.
-const PickFirstBalancerName = "pick_first"
+	PickFirstBalancerName = "pick_first"
+	logPrefix             = "[pick-first-lb %p] "
+)
 
 func newPickfirstBuilder() balancer.Builder {
 	return &pickfirstBuilder{}
@@ -40,7 +46,9 @@ func newPickfirstBuilder() balancer.Builder {
 type pickfirstBuilder struct{}
 
 func (*pickfirstBuilder) Build(cc balancer.ClientConn, opt balancer.BuildOptions) balancer.Balancer {
-	return &pickfirstBalancer{cc: cc}
+	b := &pickfirstBalancer{cc: cc}
+	b.logger = internalgrpclog.NewPrefixLogger(logger, fmt.Sprintf(logPrefix, b))
+	return b
 }
 
 func (*pickfirstBuilder) Name() string {
@@ -57,23 +65,36 @@ type pfConfig struct {
 }
 
 func (*pickfirstBuilder) ParseConfig(js json.RawMessage) (serviceconfig.LoadBalancingConfig, error) {
-	cfg := &pfConfig{}
-	if err := json.Unmarshal(js, cfg); err != nil {
+	if !envconfig.PickFirstLBConfig {
+		// Prior to supporting loadbalancing configuration, the pick_first LB
+		// policy did not implement the balancer.ConfigParser interface. This
+		// meant that if a non-empty configuration was passed to it, the service
+		// config unmarshaling code would throw a warning log, but would
+		// continue using the pick_first LB policy. The code below ensures the
+		// same behavior is retained if the env var is not set.
+		if string(js) != "{}" {
+			logger.Warningf("Ignoring non-empty balancer configuration %q for the pick_first LB policy", string(js))
+		}
+		return nil, nil
+	}
+
+	var cfg pfConfig
+	if err := json.Unmarshal(js, &cfg); err != nil {
 		return nil, fmt.Errorf("pickfirst: unable to unmarshal LB policy config: %s, error: %v", string(js), err)
 	}
 	return cfg, nil
 }
 
 type pickfirstBalancer struct {
+	logger  *internalgrpclog.PrefixLogger
 	state   connectivity.State
 	cc      balancer.ClientConn
 	subConn balancer.SubConn
-	cfg     *pfConfig
 }
 
 func (b *pickfirstBalancer) ResolverError(err error) {
-	if logger.V(2) {
-		logger.Infof("pickfirstBalancer: ResolverError called with error: %v", err)
+	if b.logger.V(2) {
+		b.logger.Infof("Received error from the name resolver: %v", err)
 	}
 	if b.subConn == nil {
 		b.state = connectivity.TransientFailure
@@ -96,35 +117,44 @@ func (b *pickfirstBalancer) UpdateClientConnState(state balancer.ClientConnState
 		// The resolver reported an empty address list. Treat it like an error by
 		// calling b.ResolverError.
 		if b.subConn != nil {
-			// Remove the old subConn. All addresses were removed, so it is no longer
-			// valid.
-			b.cc.RemoveSubConn(b.subConn)
+			// Shut down the old subConn. All addresses were removed, so it is
+			// no longer valid.
+			b.subConn.Shutdown()
 			b.subConn = nil
 		}
 		b.ResolverError(errors.New("produced zero addresses"))
 		return balancer.ErrBadResolverState
 	}
 
-	if state.BalancerConfig != nil {
-		cfg, ok := state.BalancerConfig.(*pfConfig)
-		if !ok {
-			return fmt.Errorf("pickfirstBalancer: received nil or illegal BalancerConfig (type %T): %v", state.BalancerConfig, state.BalancerConfig)
+	// We don't have to guard this block with the env var because ParseConfig
+	// already does so.
+	cfg, ok := state.BalancerConfig.(pfConfig)
+	if state.BalancerConfig != nil && !ok {
+		return fmt.Errorf("pickfirst: received illegal BalancerConfig (type %T): %v", state.BalancerConfig, state.BalancerConfig)
 	}
-		b.cfg = cfg
-	}
-
-	if envconfig.PickFirstLBConfig && b.cfg != nil && b.cfg.ShuffleAddressList {
+	if cfg.ShuffleAddressList {
+		addrs = append([]resolver.Address{}, addrs...)
 		grpcrand.Shuffle(len(addrs), func(i, j int) { addrs[i], addrs[j] = addrs[j], addrs[i] })
 	}
+
+	if b.logger.V(2) {
+		b.logger.Infof("Received new config %s, resolver state %s", pretty.ToJSON(cfg), pretty.ToJSON(state.ResolverState))
+	}
+
 	if b.subConn != nil {
 		b.cc.UpdateAddresses(b.subConn, addrs)
 		return nil
 	}
 
-	subConn, err := b.cc.NewSubConn(addrs, balancer.NewSubConnOptions{})
+	var subConn balancer.SubConn
+	subConn, err := b.cc.NewSubConn(addrs, balancer.NewSubConnOptions{
+		StateListener: func(state balancer.SubConnState) {
+			b.updateSubConnState(subConn, state)
+		},
+	})
 	if err != nil {
-		if logger.V(2) {
-			logger.Errorf("pickfirstBalancer: failed to NewSubConn: %v", err)
+		if b.logger.V(2) {
+			b.logger.Infof("Failed to create new SubConn: %v", err)
 		}
 		b.state = connectivity.TransientFailure
 		b.cc.UpdateState(balancer.State{
@@ -143,13 +173,19 @@ func (b *pickfirstBalancer) UpdateClientConnState(state balancer.ClientConnState
 	return nil
 }
 
+// UpdateSubConnState is unused as a StateListener is always registered when
+// creating SubConns.
 func (b *pickfirstBalancer) UpdateSubConnState(subConn balancer.SubConn, state balancer.SubConnState) {
-	if logger.V(2) {
-		logger.Infof("pickfirstBalancer: UpdateSubConnState: %p, %v", subConn, state)
+	b.logger.Errorf("UpdateSubConnState(%v, %+v) called unexpectedly", subConn, state)
+}
+
+func (b *pickfirstBalancer) updateSubConnState(subConn balancer.SubConn, state balancer.SubConnState) {
+	if b.logger.V(2) {
+		b.logger.Infof("Received SubConn state update: %p, %+v", subConn, state)
 	}
 	if b.subConn != subConn {
-		if logger.V(2) {
-			logger.Infof("pickfirstBalancer: ignored state change because subConn is not recognized")
+		if b.logger.V(2) {
+			b.logger.Infof("Ignored state change because subConn is not recognized")
 		}
 		return
 	}

vendor/google.golang.org/grpc/preloader.go

@@ -37,7 +37,7 @@ type PreparedMsg struct {
 }
 
 // Encode marshalls and compresses the message using the codec and compressor for the stream.
-func (p *PreparedMsg) Encode(s Stream, msg interface{}) error {
+func (p *PreparedMsg) Encode(s Stream, msg any) error {
 	ctx := s.Context()
 	rpcInfo, ok := rpcInfoFromContext(ctx)
 	if !ok {

vendor/google.golang.org/grpc/resolver/map.go

@@ -20,7 +20,7 @@ package resolver
 
 type addressMapEntry struct {
 	addr  Address
-	value interface{}
+	value any
 }
 
 // AddressMap is a map of addresses to arbitrary values taking into account
@@ -69,7 +69,7 @@ func (l addressMapEntryList) find(addr Address) int {
 }
 
 // Get returns the value for the address in the map, if present.
-func (a *AddressMap) Get(addr Address) (value interface{}, ok bool) {
+func (a *AddressMap) Get(addr Address) (value any, ok bool) {
 	addrKey := toMapKey(&addr)
 	entryList := a.m[addrKey]
 	if entry := entryList.find(addr); entry != -1 {
@@ -79,7 +79,7 @@ func (a *AddressMap) Get(addr Address) (value interface{}, ok bool) {
 }
 
 // Set updates or adds the value to the address in the map.
-func (a *AddressMap) Set(addr Address, value interface{}) {
+func (a *AddressMap) Set(addr Address, value any) {
 	addrKey := toMapKey(&addr)
 	entryList := a.m[addrKey]
 	if entry := entryList.find(addr); entry != -1 {
@@ -127,8 +127,8 @@ func (a *AddressMap) Keys() []Address {
 }
 
 // Values returns a slice of all current map values.
-func (a *AddressMap) Values() []interface{} {
-	ret := make([]interface{}, 0, a.Len())
+func (a *AddressMap) Values() []any {
+	ret := make([]any, 0, a.Len())
 	for _, entryList := range a.m {
 		for _, entry := range entryList {
 			ret = append(ret, entry.value)

vendor/google.golang.org/grpc/resolver/resolver.go

@@ -77,25 +77,6 @@ func GetDefaultScheme() string {
 	return defaultScheme
 }
 
-// AddressType indicates the address type returned by name resolution.
-//
-// Deprecated: use Attributes in Address instead.
-type AddressType uint8
-
-const (
-	// Backend indicates the address is for a backend server.
-	//
-	// Deprecated: use Attributes in Address instead.
-	Backend AddressType = iota
-	// GRPCLB indicates the address is for a grpclb load balancer.
-	//
-	// Deprecated: to select the GRPCLB load balancing policy, use a service
-	// config with a corresponding loadBalancingConfig.  To supply balancer
-	// addresses to the GRPCLB load balancing policy, set State.Attributes
-	// using balancer/grpclb/state.Set.
-	GRPCLB
-)
-
 // Address represents a server the client connects to.
 //
 // # Experimental
@@ -111,9 +92,6 @@ type Address struct {
 	// the address, instead of the hostname from the Dial target string. In most cases,
 	// this should not be set.
 	//
-	// If Type is GRPCLB, ServerName should be the name of the remote load
-	// balancer, not the name of the backend.
-	//
 	// WARNING: ServerName must only be populated with trusted values. It
 	// is insecure to populate it with data from untrusted inputs since untrusted
 	// values could be used to bypass the authority checks performed by TLS.
@@ -126,27 +104,29 @@ type Address struct {
 	// BalancerAttributes contains arbitrary data about this address intended
 	// for consumption by the LB policy.  These attributes do not affect SubConn
 	// creation, connection establishment, handshaking, etc.
-	BalancerAttributes *attributes.Attributes
-
-	// Type is the type of this address.
 	//
-	// Deprecated: use Attributes instead.
-	Type AddressType
+	// Deprecated: when an Address is inside an Endpoint, this field should not
+	// be used, and it will eventually be removed entirely.
+	BalancerAttributes *attributes.Attributes
 
 	// Metadata is the information associated with Addr, which may be used
 	// to make load balancing decision.
 	//
 	// Deprecated: use Attributes instead.
-	Metadata interface{}
+	Metadata any
 }
 
 // Equal returns whether a and o are identical.  Metadata is compared directly,
 // not with any recursive introspection.
+//
+// This method compares all fields of the address. When used to tell apart
+// addresses during subchannel creation or connection establishment, it might be
+// more appropriate for the caller to implement custom equality logic.
 func (a Address) Equal(o Address) bool {
 	return a.Addr == o.Addr && a.ServerName == o.ServerName &&
 		a.Attributes.Equal(o.Attributes) &&
 		a.BalancerAttributes.Equal(o.BalancerAttributes) &&
-		a.Type == o.Type && a.Metadata == o.Metadata
+		a.Metadata == o.Metadata
 }
 
 // String returns JSON formatted string representation of the address.
@@ -190,11 +170,37 @@ type BuildOptions struct {
 	Dialer func(context.Context, string) (net.Conn, error)
 }
 
+// An Endpoint is one network endpoint, or server, which may have multiple
+// addresses with which it can be accessed.
+type Endpoint struct {
+	// Addresses contains a list of addresses used to access this endpoint.
+	Addresses []Address
+
+	// Attributes contains arbitrary data about this endpoint intended for
+	// consumption by the LB policy.
+	Attributes *attributes.Attributes
+}
+
 // State contains the current Resolver state relevant to the ClientConn.
 type State struct {
 	// Addresses is the latest set of resolved addresses for the target.
+	//
+	// If a resolver sets Addresses but does not set Endpoints, one Endpoint
+	// will be created for each Address before the State is passed to the LB
+	// policy.  The BalancerAttributes of each entry in Addresses will be set
+	// in Endpoints.Attributes, and be cleared in the Endpoint's Address's
+	// BalancerAttributes.
+	//
+	// Soon, Addresses will be deprecated and replaced fully by Endpoints.
 	Addresses []Address
 
+	// Endpoints is the latest set of resolved endpoints for the target.
+	//
+	// If a resolver produces a State containing Endpoints but not Addresses,
+	// it must take care to ensure the LB policies it selects will support
+	// Endpoints.
+	Endpoints []Endpoint
+
 	// ServiceConfig contains the result from parsing the latest service
 	// config.  If it is nil, it indicates no service config is present or the
 	// resolver does not provide service configs.
@@ -254,20 +260,7 @@ type ClientConn interface {
 // target does not contain a scheme or if the parsed scheme is not registered
 // (i.e. no corresponding resolver available to resolve the endpoint), we will
 // apply the default scheme, and will attempt to reparse it.
-//
-// Examples:
-//
-//   - "dns://some_authority/foo.bar"
-//     Target{Scheme: "dns", Authority: "some_authority", Endpoint: "foo.bar"}
-//   - "foo.bar"
-//     Target{Scheme: resolver.GetDefaultScheme(), Endpoint: "foo.bar"}
-//   - "unknown_scheme://authority/endpoint"
-//     Target{Scheme: resolver.GetDefaultScheme(), Endpoint: "unknown_scheme://authority/endpoint"}
 type Target struct {
-	// Deprecated: use URL.Scheme instead.
-	Scheme string
-	// Deprecated: use URL.Host instead.
-	Authority string
 	// URL contains the parsed dial target with an optional default scheme added
 	// to it if the original dial target contained no scheme or contained an
 	// unregistered scheme. Any query params specified in the original dial
@@ -321,10 +314,3 @@ type Resolver interface {
 	// Close closes the resolver.
 	Close()
 }
-
-// UnregisterForTesting removes the resolver builder with the given scheme from the
-// resolver map.
-// This function is for testing only.
-func UnregisterForTesting(scheme string) {
-	delete(m, scheme)
-}

vendor/google.golang.org/grpc/resolver_conn_wrapper.go

@@ -133,7 +133,7 @@ func (ccr *ccResolverWrapper) close() {
 	ccr.mu.Unlock()
 
 	// Give enqueued callbacks a chance to finish.
-	<-ccr.serializer.Done
+	<-ccr.serializer.Done()
 
 	// Spawn a goroutine to close the resolver (since it may block trying to
 	// cleanup all allocated resources) and return early.
@@ -152,6 +152,14 @@ func (ccr *ccResolverWrapper) serializerScheduleLocked(f func(context.Context))
 // which includes addresses and service config.
 func (ccr *ccResolverWrapper) UpdateState(s resolver.State) error {
 	errCh := make(chan error, 1)
+	if s.Endpoints == nil {
+		s.Endpoints = make([]resolver.Endpoint, 0, len(s.Addresses))
+		for _, a := range s.Addresses {
+			ep := resolver.Endpoint{Addresses: []resolver.Address{a}, Attributes: a.BalancerAttributes}
+			ep.Addresses[0].BalancerAttributes = nil
+			s.Endpoints = append(s.Endpoints, ep)
+		}
+	}
 	ok := ccr.serializer.Schedule(func(context.Context) {
 		ccr.addChannelzTraceEvent(s)
 		ccr.curState = s

vendor/google.golang.org/grpc/rpc_util.go

@@ -75,7 +75,7 @@ func NewGZIPCompressorWithLevel(level int) (Compressor, error) {
 	}
 	return &gzipCompressor{
 		pool: sync.Pool{
-			New: func() interface{} {
+			New: func() any {
 				w, err := gzip.NewWriterLevel(io.Discard, level)
 				if err != nil {
 					panic(err)
@@ -577,6 +577,9 @@ type parser struct {
 	// The header of a gRPC message. Find more detail at
 	// https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md
 	header [5]byte
+
+	// recvBufferPool is the pool of shared receive buffers.
+	recvBufferPool SharedBufferPool
 }
 
 // recvMsg reads a complete gRPC message from the stream.
@@ -610,9 +613,7 @@ func (p *parser) recvMsg(maxReceiveMessageSize int) (pf payloadFormat, msg []byt
 	if int(length) > maxReceiveMessageSize {
 		return 0, nil, status.Errorf(codes.ResourceExhausted, "grpc: received message larger than max (%d vs. %d)", length, maxReceiveMessageSize)
 	}
-	// TODO(bradfitz,zhaoq): garbage. reuse buffer after proto decoding instead
-	// of making it for each message:
-	msg = make([]byte, int(length))
+	msg = p.recvBufferPool.Get(int(length))
 	if _, err := p.r.Read(msg); err != nil {
 		if err == io.EOF {
 			err = io.ErrUnexpectedEOF
@@ -625,7 +626,7 @@ func (p *parser) recvMsg(maxReceiveMessageSize int) (pf payloadFormat, msg []byt
 // encode serializes msg and returns a buffer containing the message, or an
 // error if it is too large to be transmitted by grpc.  If msg is nil, it
 // generates an empty message.
-func encode(c baseCodec, msg interface{}) ([]byte, error) {
+func encode(c baseCodec, msg any) ([]byte, error) {
 	if msg == nil { // NOTE: typed nils will not be caught by this check
 		return nil, nil
 	}
@@ -692,7 +693,7 @@ func msgHeader(data, compData []byte) (hdr []byte, payload []byte) {
 	return hdr, data
 }
 
-func outPayload(client bool, msg interface{}, data, payload []byte, t time.Time) *stats.OutPayload {
+func outPayload(client bool, msg any, data, payload []byte, t time.Time) *stats.OutPayload {
 	return &stats.OutPayload{
 		Client:           client,
 		Payload:          msg,
@@ -726,12 +727,12 @@ type payloadInfo struct {
 }
 
 func recvAndDecompress(p *parser, s *transport.Stream, dc Decompressor, maxReceiveMessageSize int, payInfo *payloadInfo, compressor encoding.Compressor) ([]byte, error) {
-	pf, d, err := p.recvMsg(maxReceiveMessageSize)
+	pf, buf, err := p.recvMsg(maxReceiveMessageSize)
 	if err != nil {
 		return nil, err
 	}
 	if payInfo != nil {
-		payInfo.compressedLength = len(d)
+		payInfo.compressedLength = len(buf)
 	}
 
 	if st := checkRecvPayload(pf, s.RecvCompress(), compressor != nil || dc != nil); st != nil {
@@ -743,10 +744,10 @@ func recvAndDecompress(p *parser, s *transport.Stream, dc Decompressor, maxRecei
 		// To match legacy behavior, if the decompressor is set by WithDecompressor or RPCDecompressor,
 		// use this decompressor as the default.
 		if dc != nil {
-			d, err = dc.Do(bytes.NewReader(d))
-			size = len(d)
+			buf, err = dc.Do(bytes.NewReader(buf))
+			size = len(buf)
 		} else {
-			d, size, err = decompress(compressor, d, maxReceiveMessageSize)
+			buf, size, err = decompress(compressor, buf, maxReceiveMessageSize)
 		}
 		if err != nil {
 			return nil, status.Errorf(codes.Internal, "grpc: failed to decompress the received message: %v", err)
@@ -757,7 +758,7 @@ func recvAndDecompress(p *parser, s *transport.Stream, dc Decompressor, maxRecei
 			return nil, status.Errorf(codes.ResourceExhausted, "grpc: received message after decompression larger than max (%d vs. %d)", size, maxReceiveMessageSize)
 		}
 	}
-	return d, nil
+	return buf, nil
 }
 
 // Using compressor, decompress d, returning data and size.
@@ -791,16 +792,18 @@ func decompress(compressor encoding.Compressor, d []byte, maxReceiveMessageSize
 // For the two compressor parameters, both should not be set, but if they are,
 // dc takes precedence over compressor.
 // TODO(dfawley): wrap the old compressor/decompressor using the new API?
-func recv(p *parser, c baseCodec, s *transport.Stream, dc Decompressor, m interface{}, maxReceiveMessageSize int, payInfo *payloadInfo, compressor encoding.Compressor) error {
-	d, err := recvAndDecompress(p, s, dc, maxReceiveMessageSize, payInfo, compressor)
+func recv(p *parser, c baseCodec, s *transport.Stream, dc Decompressor, m any, maxReceiveMessageSize int, payInfo *payloadInfo, compressor encoding.Compressor) error {
+	buf, err := recvAndDecompress(p, s, dc, maxReceiveMessageSize, payInfo, compressor)
 	if err != nil {
 		return err
 	}
-	if err := c.Unmarshal(d, m); err != nil {
+	if err := c.Unmarshal(buf, m); err != nil {
 		return status.Errorf(codes.Internal, "grpc: failed to unmarshal the received message: %v", err)
 	}
 	if payInfo != nil {
-		payInfo.uncompressedBytes = d
+		payInfo.uncompressedBytes = buf
+	} else {
+		p.recvBufferPool.Put(&buf)
 	}
 	return nil
 }
@@ -860,19 +863,22 @@ func ErrorDesc(err error) string {
 // Errorf returns nil if c is OK.
 //
 // Deprecated: use status.Errorf instead.
-func Errorf(c codes.Code, format string, a ...interface{}) error {
+func Errorf(c codes.Code, format string, a ...any) error {
 	return status.Errorf(c, format, a...)
 }
 
+var errContextCanceled = status.Error(codes.Canceled, context.Canceled.Error())
+var errContextDeadline = status.Error(codes.DeadlineExceeded, context.DeadlineExceeded.Error())
+
 // toRPCErr converts an error into an error from the status package.
 func toRPCErr(err error) error {
 	switch err {
 	case nil, io.EOF:
 		return err
 	case context.DeadlineExceeded:
-		return status.Error(codes.DeadlineExceeded, err.Error())
+		return errContextDeadline
 	case context.Canceled:
-		return status.Error(codes.Canceled, err.Error())
+		return errContextCanceled
 	case io.ErrUnexpectedEOF:
 		return status.Error(codes.Internal, err.Error())
 	}

vendor/google.golang.org/grpc/server.go

@@ -86,7 +86,7 @@ func init() {
 var statusOK = status.New(codes.OK, "")
 var logger = grpclog.Component("core")
 
-type methodHandler func(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor UnaryServerInterceptor) (interface{}, error)
+type methodHandler func(srv any, ctx context.Context, dec func(any) error, interceptor UnaryServerInterceptor) (any, error)
 
 // MethodDesc represents an RPC service's method specification.
 type MethodDesc struct {
@@ -99,20 +99,20 @@ type ServiceDesc struct {
 	ServiceName string
 	// The pointer to the service interface. Used to check whether the user
 	// provided implementation satisfies the interface requirements.
-	HandlerType interface{}
+	HandlerType any
 	Methods     []MethodDesc
 	Streams     []StreamDesc
-	Metadata    interface{}
+	Metadata    any
 }
 
 // serviceInfo wraps information about a service. It is very similar to
 // ServiceDesc and is constructed from it for internal purposes.
 type serviceInfo struct {
 	// Contains the implementation for the methods in this service.
-	serviceImpl interface{}
+	serviceImpl any
 	methods     map[string]*MethodDesc
 	streams     map[string]*StreamDesc
-	mdata       interface{}
+	mdata       any
 }
 
 // Server is a gRPC server to serve RPC requests.
@@ -164,10 +164,12 @@ type serverOptions struct {
 	initialConnWindowSize int32
 	writeBufferSize       int
 	readBufferSize        int
+	sharedWriteBuffer     bool
 	connectionTimeout     time.Duration
 	maxHeaderListSize     *uint32
 	headerTableSize       *uint32
 	numServerWorkers      uint32
+	recvBufferPool        SharedBufferPool
 }
 
 var defaultServerOptions = serverOptions{
@@ -177,6 +179,7 @@ var defaultServerOptions = serverOptions{
 	connectionTimeout:     120 * time.Second,
 	writeBufferSize:       defaultWriteBufSize,
 	readBufferSize:        defaultReadBufSize,
+	recvBufferPool:        nopBufferPool{},
 }
 var globalServerOptions []ServerOption
 
@@ -228,6 +231,20 @@ func newJoinServerOption(opts ...ServerOption) ServerOption {
 	return &joinServerOption{opts: opts}
 }
 
+// SharedWriteBuffer allows reusing per-connection transport write buffer.
+// If this option is set to true every connection will release the buffer after
+// flushing the data on the wire.
+//
+// # Experimental
+//
+// Notice: This API is EXPERIMENTAL and may be changed or removed in a
+// later release.
+func SharedWriteBuffer(val bool) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		o.sharedWriteBuffer = val
+	})
+}
+
 // WriteBufferSize determines how much data can be batched before doing a write
 // on the wire. The corresponding memory allocation for this buffer will be
 // twice the size to keep syscalls low. The default value for this buffer is
@@ -268,9 +285,9 @@ func InitialConnWindowSize(s int32) ServerOption {
 
 // KeepaliveParams returns a ServerOption that sets keepalive and max-age parameters for the server.
 func KeepaliveParams(kp keepalive.ServerParameters) ServerOption {
-	if kp.Time > 0 && kp.Time < time.Second {
+	if kp.Time > 0 && kp.Time < internal.KeepaliveMinServerPingTime {
 		logger.Warning("Adjusting keepalive ping interval to minimum period of 1s")
-		kp.Time = time.Second
+		kp.Time = internal.KeepaliveMinServerPingTime
 	}
 
 	return newFuncServerOption(func(o *serverOptions) {
@@ -550,6 +567,27 @@ func NumStreamWorkers(numServerWorkers uint32) ServerOption {
 	})
 }
 
+// RecvBufferPool returns a ServerOption that configures the server
+// to use the provided shared buffer pool for parsing incoming messages. Depending
+// on the application's workload, this could result in reduced memory allocation.
+//
+// If you are unsure about how to implement a memory pool but want to utilize one,
+// begin with grpc.NewSharedBufferPool.
+//
+// Note: The shared buffer pool feature will not be active if any of the following
+// options are used: StatsHandler, EnableTracing, or binary logging. In such
+// cases, the shared buffer pool will be ignored.
+//
+// # Experimental
+//
+// Notice: This API is EXPERIMENTAL and may be changed or removed in a
+// later release.
+func RecvBufferPool(bufferPool SharedBufferPool) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		o.recvBufferPool = bufferPool
+	})
+}
+
 // serverWorkerResetThreshold defines how often the stack must be reset. Every
 // N requests, by spawning a new goroutine in its place, a worker can reset its
 // stack so that large stacks don't live in memory forever. 2^16 should allow
@@ -625,7 +663,7 @@ func NewServer(opt ...ServerOption) *Server {
 
 // printf records an event in s's event log, unless s has been stopped.
 // REQUIRES s.mu is held.
-func (s *Server) printf(format string, a ...interface{}) {
+func (s *Server) printf(format string, a ...any) {
 	if s.events != nil {
 		s.events.Printf(format, a...)
 	}
@@ -633,7 +671,7 @@ func (s *Server) printf(format string, a ...interface{}) {
 
 // errorf records an error in s's event log, unless s has been stopped.
 // REQUIRES s.mu is held.
-func (s *Server) errorf(format string, a ...interface{}) {
+func (s *Server) errorf(format string, a ...any) {
 	if s.events != nil {
 		s.events.Errorf(format, a...)
 	}
@@ -648,14 +686,14 @@ type ServiceRegistrar interface {
 	// once the server has started serving.
 	// desc describes the service and its methods and handlers. impl is the
 	// service implementation which is passed to the method handlers.
-	RegisterService(desc *ServiceDesc, impl interface{})
+	RegisterService(desc *ServiceDesc, impl any)
 }
 
 // RegisterService registers a service and its implementation to the gRPC
 // server. It is called from the IDL generated code. This must be called before
 // invoking Serve. If ss is non-nil (for legacy code), its type is checked to
 // ensure it implements sd.HandlerType.
-func (s *Server) RegisterService(sd *ServiceDesc, ss interface{}) {
+func (s *Server) RegisterService(sd *ServiceDesc, ss any) {
 	if ss != nil {
 		ht := reflect.TypeOf(sd.HandlerType).Elem()
 		st := reflect.TypeOf(ss)
@@ -666,7 +704,7 @@ func (s *Server) RegisterService(sd *ServiceDesc, ss interface{}) {
 	s.register(sd, ss)
 }
 
-func (s *Server) register(sd *ServiceDesc, ss interface{}) {
+func (s *Server) register(sd *ServiceDesc, ss any) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
 	s.printf("RegisterService(%q)", sd.ServiceName)
@@ -707,7 +745,7 @@ type MethodInfo struct {
 type ServiceInfo struct {
 	Methods []MethodInfo
 	// Metadata is the metadata specified in ServiceDesc when registering service.
-	Metadata interface{}
+	Metadata any
 }
 
 // GetServiceInfo returns a map from service names to ServiceInfo.
@@ -908,6 +946,7 @@ func (s *Server) newHTTP2Transport(c net.Conn) transport.ServerTransport {
 		InitialConnWindowSize: s.opts.initialConnWindowSize,
 		WriteBufferSize:       s.opts.writeBufferSize,
 		ReadBufferSize:        s.opts.readBufferSize,
+		SharedWriteBuffer:     s.opts.sharedWriteBuffer,
 		ChannelzParentID:      s.channelzID,
 		MaxHeaderListSize:     s.opts.maxHeaderListSize,
 		HeaderTableSize:       s.opts.headerTableSize,
@@ -1094,7 +1133,7 @@ func (s *Server) incrCallsFailed() {
 	atomic.AddInt64(&s.czData.callsFailed, 1)
 }
 
-func (s *Server) sendResponse(t transport.ServerTransport, stream *transport.Stream, msg interface{}, cp Compressor, opts *transport.Options, comp encoding.Compressor) error {
+func (s *Server) sendResponse(t transport.ServerTransport, stream *transport.Stream, msg any, cp Compressor, opts *transport.Options, comp encoding.Compressor) error {
 	data, err := encode(s.getCodec(stream.ContentSubtype()), msg)
 	if err != nil {
 		channelz.Error(logger, s.channelzID, "grpc: server failed to encode response: ", err)
@@ -1141,7 +1180,7 @@ func chainUnaryServerInterceptors(s *Server) {
 }
 
 func chainUnaryInterceptors(interceptors []UnaryServerInterceptor) UnaryServerInterceptor {
-	return func(ctx context.Context, req interface{}, info *UnaryServerInfo, handler UnaryHandler) (interface{}, error) {
+	return func(ctx context.Context, req any, info *UnaryServerInfo, handler UnaryHandler) (any, error) {
 		return interceptors[0](ctx, req, info, getChainUnaryHandler(interceptors, 0, info, handler))
 	}
 }
@@ -1150,7 +1189,7 @@ func getChainUnaryHandler(interceptors []UnaryServerInterceptor, curr int, info
 	if curr == len(interceptors)-1 {
 		return finalHandler
 	}
-	return func(ctx context.Context, req interface{}) (interface{}, error) {
+	return func(ctx context.Context, req any) (any, error) {
 		return interceptors[curr+1](ctx, req, info, getChainUnaryHandler(interceptors, curr+1, info, finalHandler))
 	}
 }
@@ -1187,7 +1226,7 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 		defer func() {
 			if trInfo != nil {
 				if err != nil && err != io.EOF {
-					trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
+					trInfo.tr.LazyLog(&fmtStringer{"%v", []any{err}}, true)
 					trInfo.tr.SetError()
 				}
 				trInfo.tr.Finish()
@@ -1294,7 +1333,7 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 	if len(shs) != 0 || len(binlogs) != 0 {
 		payInfo = &payloadInfo{}
 	}
-	d, err := recvAndDecompress(&parser{r: stream}, stream, dc, s.opts.maxReceiveMessageSize, payInfo, decomp)
+	d, err := recvAndDecompress(&parser{r: stream, recvBufferPool: s.opts.recvBufferPool}, stream, dc, s.opts.maxReceiveMessageSize, payInfo, decomp)
 	if err != nil {
 		if e := t.WriteStatus(stream, status.Convert(err)); e != nil {
 			channelz.Warningf(logger, s.channelzID, "grpc: Server.processUnaryRPC failed to write status: %v", e)
@@ -1304,7 +1343,7 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 	if channelz.IsOn() {
 		t.IncrMsgRecv()
 	}
-	df := func(v interface{}) error {
+	df := func(v any) error {
 		if err := s.getCodec(stream.ContentSubtype()).Unmarshal(d, v); err != nil {
 			return status.Errorf(codes.Internal, "grpc: error unmarshalling request: %v", err)
 		}
@@ -1468,7 +1507,7 @@ func chainStreamServerInterceptors(s *Server) {
 }
 
 func chainStreamInterceptors(interceptors []StreamServerInterceptor) StreamServerInterceptor {
-	return func(srv interface{}, ss ServerStream, info *StreamServerInfo, handler StreamHandler) error {
+	return func(srv any, ss ServerStream, info *StreamServerInfo, handler StreamHandler) error {
 		return interceptors[0](srv, ss, info, getChainStreamHandler(interceptors, 0, info, handler))
 	}
 }
@@ -1477,7 +1516,7 @@ func getChainStreamHandler(interceptors []StreamServerInterceptor, curr int, inf
 	if curr == len(interceptors)-1 {
 		return finalHandler
 	}
-	return func(srv interface{}, stream ServerStream) error {
+	return func(srv any, stream ServerStream) error {
 		return interceptors[curr+1](srv, stream, info, getChainStreamHandler(interceptors, curr+1, info, finalHandler))
 	}
 }
@@ -1504,7 +1543,7 @@ func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transp
 		ctx:                   ctx,
 		t:                     t,
 		s:                     stream,
-		p:                     &parser{r: stream},
+		p:                     &parser{r: stream, recvBufferPool: s.opts.recvBufferPool},
 		codec:                 s.getCodec(stream.ContentSubtype()),
 		maxReceiveMessageSize: s.opts.maxReceiveMessageSize,
 		maxSendMessageSize:    s.opts.maxSendMessageSize,
@@ -1518,7 +1557,7 @@ func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transp
 			if trInfo != nil {
 				ss.mu.Lock()
 				if err != nil && err != io.EOF {
-					ss.trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
+					ss.trInfo.tr.LazyLog(&fmtStringer{"%v", []any{err}}, true)
 					ss.trInfo.tr.SetError()
 				}
 				ss.trInfo.tr.Finish()
@@ -1621,7 +1660,7 @@ func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transp
 		trInfo.tr.LazyLog(&trInfo.firstLine, false)
 	}
 	var appErr error
-	var server interface{}
+	var server any
 	if info != nil {
 		server = info.serviceImpl
 	}
@@ -1687,13 +1726,13 @@ func (s *Server) handleStream(t transport.ServerTransport, stream *transport.Str
 	pos := strings.LastIndex(sm, "/")
 	if pos == -1 {
 		if trInfo != nil {
-			trInfo.tr.LazyLog(&fmtStringer{"Malformed method name %q", []interface{}{sm}}, true)
+			trInfo.tr.LazyLog(&fmtStringer{"Malformed method name %q", []any{sm}}, true)
 			trInfo.tr.SetError()
 		}
 		errDesc := fmt.Sprintf("malformed method name: %q", stream.Method())
 		if err := t.WriteStatus(stream, status.New(codes.Unimplemented, errDesc)); err != nil {
 			if trInfo != nil {
-				trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
+				trInfo.tr.LazyLog(&fmtStringer{"%v", []any{err}}, true)
 				trInfo.tr.SetError()
 			}
 			channelz.Warningf(logger, s.channelzID, "grpc: Server.handleStream failed to write status: %v", err)
@@ -1734,7 +1773,7 @@ func (s *Server) handleStream(t transport.ServerTransport, stream *transport.Str
 	}
 	if err := t.WriteStatus(stream, status.New(codes.Unimplemented, errDesc)); err != nil {
 		if trInfo != nil {
-			trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
+			trInfo.tr.LazyLog(&fmtStringer{"%v", []any{err}}, true)
 			trInfo.tr.SetError()
 		}
 		channelz.Warningf(logger, s.channelzID, "grpc: Server.handleStream failed to write status: %v", err)
@@ -2054,12 +2093,12 @@ func validateSendCompressor(name, clientCompressors string) error {
 // atomicSemaphore implements a blocking, counting semaphore. acquire should be
 // called synchronously; release may be called asynchronously.
 type atomicSemaphore struct {
-	n    int64
+	n    atomic.Int64
 	wait chan struct{}
 }
 
 func (q *atomicSemaphore) acquire() {
-	if atomic.AddInt64(&q.n, -1) < 0 {
+	if q.n.Add(-1) < 0 {
 		// We ran out of quota.  Block until a release happens.
 		<-q.wait
 	}
@@ -2070,12 +2109,14 @@ func (q *atomicSemaphore) release() {
 	// concurrent calls to acquire, but also note that with synchronous calls to
 	// acquire, as our system does, n will never be less than -1.  There are
 	// fairness issues (queuing) to consider if this was to be generalized.
-	if atomic.AddInt64(&q.n, 1) <= 0 {
+	if q.n.Add(1) <= 0 {
 		// An acquire was waiting on us.  Unblock it.
 		q.wait <- struct{}{}
 	}
 }
 
 func newHandlerQuota(n uint32) *atomicSemaphore {
-	return &atomicSemaphore{n: int64(n), wait: make(chan struct{}, 1)}
+	a := &atomicSemaphore{wait: make(chan struct{}, 1)}
+	a.n.Store(int64(n))
+	return a
 }

vendor/google.golang.org/grpc/shared_buffer_pool.go

@@ -0,0 +1,154 @@
+/*
+ *
+ * Copyright 2023 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+import "sync"
+
+// SharedBufferPool is a pool of buffers that can be shared, resulting in
+// decreased memory allocation. Currently, in gRPC-go, it is only utilized
+// for parsing incoming messages.
+//
+// # Experimental
+//
+// Notice: This API is EXPERIMENTAL and may be changed or removed in a
+// later release.
+type SharedBufferPool interface {
+	// Get returns a buffer with specified length from the pool.
+	//
+	// The returned byte slice may be not zero initialized.
+	Get(length int) []byte
+
+	// Put returns a buffer to the pool.
+	Put(*[]byte)
+}
+
+// NewSharedBufferPool creates a simple SharedBufferPool with buckets
+// of different sizes to optimize memory usage. This prevents the pool from
+// wasting large amounts of memory, even when handling messages of varying sizes.
+//
+// # Experimental
+//
+// Notice: This API is EXPERIMENTAL and may be changed or removed in a
+// later release.
+func NewSharedBufferPool() SharedBufferPool {
+	return &simpleSharedBufferPool{
+		pools: [poolArraySize]simpleSharedBufferChildPool{
+			newBytesPool(level0PoolMaxSize),
+			newBytesPool(level1PoolMaxSize),
+			newBytesPool(level2PoolMaxSize),
+			newBytesPool(level3PoolMaxSize),
+			newBytesPool(level4PoolMaxSize),
+			newBytesPool(0),
+		},
+	}
+}
+
+// simpleSharedBufferPool is a simple implementation of SharedBufferPool.
+type simpleSharedBufferPool struct {
+	pools [poolArraySize]simpleSharedBufferChildPool
+}
+
+func (p *simpleSharedBufferPool) Get(size int) []byte {
+	return p.pools[p.poolIdx(size)].Get(size)
+}
+
+func (p *simpleSharedBufferPool) Put(bs *[]byte) {
+	p.pools[p.poolIdx(cap(*bs))].Put(bs)
+}
+
+func (p *simpleSharedBufferPool) poolIdx(size int) int {
+	switch {
+	case size <= level0PoolMaxSize:
+		return level0PoolIdx
+	case size <= level1PoolMaxSize:
+		return level1PoolIdx
+	case size <= level2PoolMaxSize:
+		return level2PoolIdx
+	case size <= level3PoolMaxSize:
+		return level3PoolIdx
+	case size <= level4PoolMaxSize:
+		return level4PoolIdx
+	default:
+		return levelMaxPoolIdx
+	}
+}
+
+const (
+	level0PoolMaxSize = 16                     //  16  B
+	level1PoolMaxSize = level0PoolMaxSize * 16 // 256  B
+	level2PoolMaxSize = level1PoolMaxSize * 16 //   4 KB
+	level3PoolMaxSize = level2PoolMaxSize * 16 //  64 KB
+	level4PoolMaxSize = level3PoolMaxSize * 16 //   1 MB
+)
+
+const (
+	level0PoolIdx = iota
+	level1PoolIdx
+	level2PoolIdx
+	level3PoolIdx
+	level4PoolIdx
+	levelMaxPoolIdx
+	poolArraySize
+)
+
+type simpleSharedBufferChildPool interface {
+	Get(size int) []byte
+	Put(any)
+}
+
+type bufferPool struct {
+	sync.Pool
+
+	defaultSize int
+}
+
+func (p *bufferPool) Get(size int) []byte {
+	bs := p.Pool.Get().(*[]byte)
+
+	if cap(*bs) < size {
+		p.Pool.Put(bs)
+
+		return make([]byte, size)
+	}
+
+	return (*bs)[:size]
+}
+
+func newBytesPool(size int) simpleSharedBufferChildPool {
+	return &bufferPool{
+		Pool: sync.Pool{
+			New: func() any {
+				bs := make([]byte, size)
+				return &bs
+			},
+		},
+		defaultSize: size,
+	}
+}
+
+// nopBufferPool is a buffer pool just makes new buffer without pooling.
+type nopBufferPool struct {
+}
+
+func (nopBufferPool) Get(length int) []byte {
+	return make([]byte, length)
+}
+
+func (nopBufferPool) Put(*[]byte) {
+}

vendor/google.golang.org/grpc/stats/stats.go

@@ -59,12 +59,22 @@ func (s *Begin) IsClient() bool { return s.Client }
 
 func (s *Begin) isRPCStats() {}
 
+// PickerUpdated indicates that the LB policy provided a new picker while the
+// RPC was waiting for one.
+type PickerUpdated struct{}
+
+// IsClient indicates if the stats information is from client side. Only Client
+// Side interfaces with a Picker, thus always returns true.
+func (*PickerUpdated) IsClient() bool { return true }
+
+func (*PickerUpdated) isRPCStats() {}
+
 // InPayload contains the information for an incoming payload.
 type InPayload struct {
 	// Client is true if this InPayload is from client side.
 	Client bool
 	// Payload is the payload with original type.
-	Payload interface{}
+	Payload any
 	// Data is the serialized message payload.
 	Data []byte
 
@@ -134,7 +144,7 @@ type OutPayload struct {
 	// Client is true if this OutPayload is from client side.
 	Client bool
 	// Payload is the payload with original type.
-	Payload interface{}
+	Payload any
 	// Data is the serialized message payload.
 	Data []byte
 	// Length is the size of the uncompressed payload data. Does not include any

vendor/google.golang.org/grpc/status/status.go

@@ -50,7 +50,7 @@ func New(c codes.Code, msg string) *Status {
 }
 
 // Newf returns New(c, fmt.Sprintf(format, a...)).
-func Newf(c codes.Code, format string, a ...interface{}) *Status {
+func Newf(c codes.Code, format string, a ...any) *Status {
 	return New(c, fmt.Sprintf(format, a...))
 }
 
@@ -60,7 +60,7 @@ func Error(c codes.Code, msg string) error {
 }
 
 // Errorf returns Error(c, fmt.Sprintf(format, a...)).
-func Errorf(c codes.Code, format string, a ...interface{}) error {
+func Errorf(c codes.Code, format string, a ...any) error {
 	return Error(c, fmt.Sprintf(format, a...))
 }
 
@@ -99,25 +99,27 @@ func FromError(err error) (s *Status, ok bool) {
 	}
 	type grpcstatus interface{ GRPCStatus() *Status }
 	if gs, ok := err.(grpcstatus); ok {
-		if gs.GRPCStatus() == nil {
+		grpcStatus := gs.GRPCStatus()
+		if grpcStatus == nil {
 			// Error has status nil, which maps to codes.OK. There
 			// is no sensible behavior for this, so we turn it into
 			// an error with codes.Unknown and discard the existing
 			// status.
 			return New(codes.Unknown, err.Error()), false
 		}
-		return gs.GRPCStatus(), true
+		return grpcStatus, true
 	}
 	var gs grpcstatus
 	if errors.As(err, &gs) {
-		if gs.GRPCStatus() == nil {
+		grpcStatus := gs.GRPCStatus()
+		if grpcStatus == nil {
 			// Error wraps an error that has status nil, which maps
 			// to codes.OK.  There is no sensible behavior for this,
 			// so we turn it into an error with codes.Unknown and
 			// discard the existing status.
 			return New(codes.Unknown, err.Error()), false
 		}
-		p := gs.GRPCStatus().Proto()
+		p := grpcStatus.Proto()
 		p.Message = err.Error()
 		return status.FromProto(p), true
 	}

vendor/google.golang.org/grpc/stream.go

@@ -31,6 +31,7 @@ import (
 	"google.golang.org/grpc/balancer"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/encoding"
+	"google.golang.org/grpc/internal"
 	"google.golang.org/grpc/internal/balancerload"
 	"google.golang.org/grpc/internal/binarylog"
 	"google.golang.org/grpc/internal/channelz"
@@ -54,7 +55,7 @@ import (
 // status package, or be one of the context errors. Otherwise, gRPC will use
 // codes.Unknown as the status code and err.Error() as the status message of the
 // RPC.
-type StreamHandler func(srv interface{}, stream ServerStream) error
+type StreamHandler func(srv any, stream ServerStream) error
 
 // StreamDesc represents a streaming RPC service's method specification.  Used
 // on the server when registering services and on the client when initiating
@@ -79,9 +80,9 @@ type Stream interface {
 	// Deprecated: See ClientStream and ServerStream documentation instead.
 	Context() context.Context
 	// Deprecated: See ClientStream and ServerStream documentation instead.
-	SendMsg(m interface{}) error
+	SendMsg(m any) error
 	// Deprecated: See ClientStream and ServerStream documentation instead.
-	RecvMsg(m interface{}) error
+	RecvMsg(m any) error
 }
 
 // ClientStream defines the client-side behavior of a streaming RPC.
@@ -90,7 +91,9 @@ type Stream interface {
 // status package.
 type ClientStream interface {
 	// Header returns the header metadata received from the server if there
-	// is any. It blocks if the metadata is not ready to read.
+	// is any. It blocks if the metadata is not ready to read.  If the metadata
+	// is nil and the error is also nil, then the stream was terminated without
+	// headers, and the status can be discovered by calling RecvMsg.
 	Header() (metadata.MD, error)
 	// Trailer returns the trailer metadata from the server, if there is any.
 	// It must only be called after stream.CloseAndRecv has returned, or
@@ -126,7 +129,7 @@ type ClientStream interface {
 	//
 	// It is not safe to modify the message after calling SendMsg. Tracing
 	// libraries and stats handlers may use the message lazily.
-	SendMsg(m interface{}) error
+	SendMsg(m any) error
 	// RecvMsg blocks until it receives a message into m or the stream is
 	// done. It returns io.EOF when the stream completes successfully. On
 	// any other error, the stream is aborted and the error contains the RPC
@@ -135,7 +138,7 @@ type ClientStream interface {
 	// It is safe to have a goroutine calling SendMsg and another goroutine
 	// calling RecvMsg on the same stream at the same time, but it is not
 	// safe to call RecvMsg on the same stream in different goroutines.
-	RecvMsg(m interface{}) error
+	RecvMsg(m any) error
 }
 
 // NewStream creates a new Stream for the client side. This is typically
@@ -155,11 +158,6 @@ type ClientStream interface {
 // If none of the above happen, a goroutine and a context will be leaked, and grpc
 // will not call the optionally-configured stats handler with a stats.End message.
 func (cc *ClientConn) NewStream(ctx context.Context, desc *StreamDesc, method string, opts ...CallOption) (ClientStream, error) {
-	if err := cc.idlenessMgr.onCallBegin(); err != nil {
-		return nil, err
-	}
-	defer cc.idlenessMgr.onCallEnd()
-
 	// allow interceptor to see all applicable call options, which means those
 	// configured as defaults from dial option as well as per-call options
 	opts = combine(cc.dopts.callOptions, opts)
@@ -176,6 +174,16 @@ func NewClientStream(ctx context.Context, desc *StreamDesc, cc *ClientConn, meth
 }
 
 func newClientStream(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, opts ...CallOption) (_ ClientStream, err error) {
+	// Start tracking the RPC for idleness purposes. This is where a stream is
+	// created for both streaming and unary RPCs, and hence is a good place to
+	// track active RPC count.
+	if err := cc.idlenessMgr.OnCallBegin(); err != nil {
+		return nil, err
+	}
+	// Add a calloption, to decrement the active call count, that gets executed
+	// when the RPC completes.
+	opts = append([]CallOption{OnFinish(func(error) { cc.idlenessMgr.OnCallEnd() })}, opts...)
+
 	if md, added, ok := metadata.FromOutgoingContextRaw(ctx); ok {
 		// validate md
 		if err := imetadata.Validate(md); err != nil {
@@ -433,7 +441,7 @@ func (cs *clientStream) newAttemptLocked(isTransparent bool) (*csAttempt, error)
 		ctx = trace.NewContext(ctx, trInfo.tr)
 	}
 
-	if cs.cc.parsedTarget.URL.Scheme == "xds" {
+	if cs.cc.parsedTarget.URL.Scheme == internal.GRPCResolverSchemeExtraMetadata {
 		// Add extra metadata (metadata that will be added by transport) to context
 		// so the balancer can see them.
 		ctx = grpcutil.WithExtraMetadata(ctx, metadata.Pairs(
@@ -507,7 +515,7 @@ func (a *csAttempt) newStream() error {
 		return toRPCErr(nse.Err)
 	}
 	a.s = s
-	a.p = &parser{r: s}
+	a.p = &parser{r: s, recvBufferPool: a.cs.cc.dopts.recvBufferPool}
 	return nil
 }
 
@@ -788,23 +796,24 @@ func (cs *clientStream) withRetry(op func(a *csAttempt) error, onSuccess func())
 
 func (cs *clientStream) Header() (metadata.MD, error) {
 	var m metadata.MD
-	noHeader := false
 	err := cs.withRetry(func(a *csAttempt) error {
 		var err error
 		m, err = a.s.Header()
-		if err == transport.ErrNoHeaders {
-			noHeader = true
-			return nil
-		}
 		return toRPCErr(err)
 	}, cs.commitAttemptLocked)
 
-	if err != nil {
-		cs.finish(err)
-		return nil, err
+	if m == nil && err == nil {
+		// The stream ended with success.  Finish the clientStream.
+		err = io.EOF
 	}
 
-	if len(cs.binlogs) != 0 && !cs.serverHeaderBinlogged && !noHeader {
+	if err != nil {
+		cs.finish(err)
+		// Do not return the error.  The user should get it by calling Recv().
+		return nil, nil
+	}
+
+	if len(cs.binlogs) != 0 && !cs.serverHeaderBinlogged && m != nil {
 		// Only log if binary log is on and header has not been logged, and
 		// there is actually headers to log.
 		logEntry := &binarylog.ServerHeader{
@@ -820,6 +829,7 @@ func (cs *clientStream) Header() (metadata.MD, error) {
 			binlog.Log(cs.ctx, logEntry)
 		}
 	}
+
 	return m, nil
 }
 
@@ -860,7 +870,7 @@ func (cs *clientStream) bufferForRetryLocked(sz int, op func(a *csAttempt) error
 	cs.buffer = append(cs.buffer, op)
 }
 
-func (cs *clientStream) SendMsg(m interface{}) (err error) {
+func (cs *clientStream) SendMsg(m any) (err error) {
 	defer func() {
 		if err != nil && err != io.EOF {
 			// Call finish on the client stream for errors generated by this SendMsg
@@ -904,7 +914,7 @@ func (cs *clientStream) SendMsg(m interface{}) (err error) {
 	return err
 }
 
-func (cs *clientStream) RecvMsg(m interface{}) error {
+func (cs *clientStream) RecvMsg(m any) error {
 	if len(cs.binlogs) != 0 && !cs.serverHeaderBinlogged {
 		// Call Header() to binary log header if it's not already logged.
 		cs.Header()
@@ -928,24 +938,6 @@ func (cs *clientStream) RecvMsg(m interface{}) error {
 	if err != nil || !cs.desc.ServerStreams {
 		// err != nil or non-server-streaming indicates end of stream.
 		cs.finish(err)
-
-		if len(cs.binlogs) != 0 {
-			// finish will not log Trailer. Log Trailer here.
-			logEntry := &binarylog.ServerTrailer{
-				OnClientSide: true,
-				Trailer:      cs.Trailer(),
-				Err:          err,
-			}
-			if logEntry.Err == io.EOF {
-				logEntry.Err = nil
-			}
-			if peer, ok := peer.FromContext(cs.Context()); ok {
-				logEntry.PeerAddr = peer.Addr
-			}
-			for _, binlog := range cs.binlogs {
-				binlog.Log(cs.ctx, logEntry)
-			}
-		}
 	}
 	return err
 }
@@ -1001,19 +993,31 @@ func (cs *clientStream) finish(err error) {
 			}
 		}
 	}
+
 	cs.mu.Unlock()
-	// For binary logging. only log cancel in finish (could be caused by RPC ctx
-	// canceled or ClientConn closed). Trailer will be logged in RecvMsg.
-	//
-	// Only one of cancel or trailer needs to be logged. In the cases where
-	// users don't call RecvMsg, users must have already canceled the RPC.
-	if len(cs.binlogs) != 0 && status.Code(err) == codes.Canceled {
+	// Only one of cancel or trailer needs to be logged.
+	if len(cs.binlogs) != 0 {
+		switch err {
+		case errContextCanceled, errContextDeadline, ErrClientConnClosing:
 			c := &binarylog.Cancel{
 				OnClientSide: true,
 			}
 			for _, binlog := range cs.binlogs {
 				binlog.Log(cs.ctx, c)
 			}
+		default:
+			logEntry := &binarylog.ServerTrailer{
+				OnClientSide: true,
+				Trailer:      cs.Trailer(),
+				Err:          err,
+			}
+			if peer, ok := peer.FromContext(cs.Context()); ok {
+				logEntry.PeerAddr = peer.Addr
+			}
+			for _, binlog := range cs.binlogs {
+				binlog.Log(cs.ctx, logEntry)
+			}
+		}
 	}
 	if err == nil {
 		cs.retryThrottler.successfulRPC()
@@ -1028,7 +1032,7 @@ func (cs *clientStream) finish(err error) {
 	cs.cancel()
 }
 
-func (a *csAttempt) sendMsg(m interface{}, hdr, payld, data []byte) error {
+func (a *csAttempt) sendMsg(m any, hdr, payld, data []byte) error {
 	cs := a.cs
 	if a.trInfo != nil {
 		a.mu.Lock()
@@ -1055,7 +1059,7 @@ func (a *csAttempt) sendMsg(m interface{}, hdr, payld, data []byte) error {
 	return nil
 }
 
-func (a *csAttempt) recvMsg(m interface{}, payInfo *payloadInfo) (err error) {
+func (a *csAttempt) recvMsg(m any, payInfo *payloadInfo) (err error) {
 	cs := a.cs
 	if len(a.statsHandlers) != 0 && payInfo == nil {
 		payInfo = &payloadInfo{}
@@ -1270,7 +1274,7 @@ func newNonRetryClientStream(ctx context.Context, desc *StreamDesc, method strin
 		return nil, err
 	}
 	as.s = s
-	as.p = &parser{r: s}
+	as.p = &parser{r: s, recvBufferPool: ac.dopts.recvBufferPool}
 	ac.incrCallsStarted()
 	if desc != unaryStreamDesc {
 		// Listen on stream context to cleanup when the stream context is
@@ -1348,7 +1352,7 @@ func (as *addrConnStream) Context() context.Context {
 	return as.s.Context()
 }
 
-func (as *addrConnStream) SendMsg(m interface{}) (err error) {
+func (as *addrConnStream) SendMsg(m any) (err error) {
 	defer func() {
 		if err != nil && err != io.EOF {
 			// Call finish on the client stream for errors generated by this SendMsg
@@ -1393,7 +1397,7 @@ func (as *addrConnStream) SendMsg(m interface{}) (err error) {
 	return nil
 }
 
-func (as *addrConnStream) RecvMsg(m interface{}) (err error) {
+func (as *addrConnStream) RecvMsg(m any) (err error) {
 	defer func() {
 		if err != nil || !as.desc.ServerStreams {
 			// err != nil or non-server-streaming indicates end of stream.
@@ -1512,7 +1516,7 @@ type ServerStream interface {
 	//
 	// It is not safe to modify the message after calling SendMsg. Tracing
 	// libraries and stats handlers may use the message lazily.
-	SendMsg(m interface{}) error
+	SendMsg(m any) error
 	// RecvMsg blocks until it receives a message into m or the stream is
 	// done. It returns io.EOF when the client has performed a CloseSend. On
 	// any non-EOF error, the stream is aborted and the error contains the
@@ -1521,7 +1525,7 @@ type ServerStream interface {
 	// It is safe to have a goroutine calling SendMsg and another goroutine
 	// calling RecvMsg on the same stream at the same time, but it is not
 	// safe to call RecvMsg on the same stream in different goroutines.
-	RecvMsg(m interface{}) error
+	RecvMsg(m any) error
 }
 
 // serverStream implements a server side Stream.
@@ -1602,7 +1606,7 @@ func (ss *serverStream) SetTrailer(md metadata.MD) {
 	ss.s.SetTrailer(md)
 }
 
-func (ss *serverStream) SendMsg(m interface{}) (err error) {
+func (ss *serverStream) SendMsg(m any) (err error) {
 	defer func() {
 		if ss.trInfo != nil {
 			ss.mu.Lock()
@@ -1610,7 +1614,7 @@ func (ss *serverStream) SendMsg(m interface{}) (err error) {
 				if err == nil {
 					ss.trInfo.tr.LazyLog(&payload{sent: true, msg: m}, true)
 				} else {
-					ss.trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
+					ss.trInfo.tr.LazyLog(&fmtStringer{"%v", []any{err}}, true)
 					ss.trInfo.tr.SetError()
 				}
 			}
@@ -1677,7 +1681,7 @@ func (ss *serverStream) SendMsg(m interface{}) (err error) {
 	return nil
 }
 
-func (ss *serverStream) RecvMsg(m interface{}) (err error) {
+func (ss *serverStream) RecvMsg(m any) (err error) {
 	defer func() {
 		if ss.trInfo != nil {
 			ss.mu.Lock()
@@ -1685,7 +1689,7 @@ func (ss *serverStream) RecvMsg(m interface{}) (err error) {
 				if err == nil {
 					ss.trInfo.tr.LazyLog(&payload{sent: false, msg: m}, true)
 				} else if err != io.EOF {
-					ss.trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
+					ss.trInfo.tr.LazyLog(&fmtStringer{"%v", []any{err}}, true)
 					ss.trInfo.tr.SetError()
 				}
 			}
@@ -1757,7 +1761,7 @@ func MethodFromServerStream(stream ServerStream) (string, bool) {
 // prepareMsg returns the hdr, payload and data
 // using the compressors passed or using the
 // passed preparedmsg
-func prepareMsg(m interface{}, codec baseCodec, cp Compressor, comp encoding.Compressor) (hdr, payload, data []byte, err error) {
+func prepareMsg(m any, codec baseCodec, cp Compressor, comp encoding.Compressor) (hdr, payload, data []byte, err error) {
 	if preparedMsg, ok := m.(*PreparedMsg); ok {
 		return preparedMsg.hdr, preparedMsg.payload, preparedMsg.encodedData, nil
 	}

vendor/google.golang.org/grpc/trace.go

@@ -98,7 +98,7 @@ func truncate(x string, l int) string {
 // payload represents an RPC request or response payload.
 type payload struct {
 	sent bool // whether this is an outgoing payload
-	msg  interface{} // e.g. a proto.Message
+	msg  any  // e.g. a proto.Message
 	// TODO(dsymonds): add stringifying info to codec, and limit how much we hold here?
 }
 
@@ -111,7 +111,7 @@ func (p payload) String() string {
 
 type fmtStringer struct {
 	format string
-	a      []interface{}
+	a      []any
 }
 
 func (f *fmtStringer) String() string {

vendor/google.golang.org/grpc/version.go

@@ -19,4 +19,4 @@
 package grpc
 
 // Version is the current grpc version.
-const Version = "1.56.3"
+const Version = "1.58.3"

vendor/google.golang.org/grpc/vet.sh

@@ -84,6 +84,9 @@ not git grep -l 'x/net/context' -- "*.go"
 #   thread safety.
 git grep -l '"math/rand"' -- "*.go" 2>&1 | not grep -v '^examples\|^stress\|grpcrand\|^benchmark\|wrr_test'
 
+# - Do not use "interface{}"; use "any" instead.
+git grep -l 'interface{}' -- "*.go" 2>&1 | not grep -v '\.pb\.go\|protoc-gen-go-grpc'
+
 # - Do not call grpclog directly. Use grpclog.Component instead.
 git grep -l -e 'grpclog.I' --or -e 'grpclog.W' --or -e 'grpclog.E' --or -e 'grpclog.F' --or -e 'grpclog.V' -- "*.go" | not grep -v '^grpclog/component.go\|^internal/grpctest/tlogger_test.go'
 
@@ -106,7 +109,7 @@ for MOD_FILE in $(find . -name 'go.mod'); do
   goimports -l . 2>&1 | not grep -vE "\.pb\.go"
   golint ./... 2>&1 | not grep -vE "/grpc_testing_not_regenerate/.*\.pb\.go:"
 
-  go mod tidy -compat=1.17
+  go mod tidy -compat=1.19
   git status --porcelain 2>&1 | fail_on_output || \
     (git status; git --no-pager diff; exit 1)
   popd
@@ -168,8 +171,6 @@ proto.RegisteredExtension is deprecated
 proto.RegisteredExtensions is deprecated
 proto.RegisterMapType is deprecated
 proto.Unmarshaler is deprecated
-resolver.Backend
-resolver.GRPCLB
 Target is deprecated: Use the Target field in the BuildOptions instead.
 xxx_messageInfo_
 ' "${SC_OUT}"

vendor/modules.txt

@@ -368,11 +368,11 @@ golang.org/x/tools/internal/pkgbits
 golang.org/x/tools/internal/tokeninternal
 golang.org/x/tools/internal/typeparams
 golang.org/x/tools/internal/typesinternal
-# google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1
+# google.golang.org/genproto/googleapis/rpc v0.0.0-20230711160842-782d3b101e98
 ## explicit; go 1.19
 google.golang.org/genproto/googleapis/rpc/status
-# google.golang.org/grpc v1.56.3
-## explicit; go 1.17
+# google.golang.org/grpc v1.58.3
+## explicit; go 1.19
 google.golang.org/grpc
 google.golang.org/grpc/attributes
 google.golang.org/grpc/backoff
@@ -402,6 +402,7 @@ google.golang.org/grpc/internal/grpclog
 google.golang.org/grpc/internal/grpcrand
 google.golang.org/grpc/internal/grpcsync
 google.golang.org/grpc/internal/grpcutil
+google.golang.org/grpc/internal/idle
 google.golang.org/grpc/internal/metadata
 google.golang.org/grpc/internal/pretty
 google.golang.org/grpc/internal/resolver