grpc-go/resolver_conn_wrapper.go

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3.4 KiB
Go
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/*
*
* Copyright 2017 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 (
"strings"
"google.golang.org/grpc/grpclog"
"google.golang.org/grpc/resolver"
)
// ccResolverWrapper is a wrapper on top of cc for resolvers.
// It implements resolver.ClientConnection interface.
type ccResolverWrapper struct {
cc *ClientConn
resolver resolver.Resolver
addrCh chan []resolver.Address
scCh chan string
done chan struct{}
}
// newCCResolverWrapper parses cc.target for scheme and gets the resolver
// builder for this scheme. It then builds the resolver and starts the
// monitoring goroutine for it.
//
// This function could return nil, nil, in tests for old behaviors.
// TODO(bar) never return nil, nil when DNS becomes the default resolver.
func newCCResolverWrapper(cc *ClientConn) (*ccResolverWrapper, error) {
var scheme string
targetSplitted := strings.Split(cc.target, "://")
if len(targetSplitted) >= 2 {
scheme = targetSplitted[0]
}
grpclog.Infof("dialing to target with scheme: %q", scheme)
rb := resolver.Get(scheme)
if rb == nil {
// TODO(bar) return error when DNS becomes the default (implemented and
// registered by DNS package).
grpclog.Infof("could not get resolver for scheme: %q", scheme)
return nil, nil
}
ccr := &ccResolverWrapper{
cc: cc,
addrCh: make(chan []resolver.Address, 1),
scCh: make(chan string, 1),
done: make(chan struct{}),
}
var err error
ccr.resolver, err = rb.Build(cc.target, ccr, resolver.BuildOption{})
if err != nil {
return nil, err
}
go ccr.watcher()
return ccr, nil
}
// watcher processes address updates and service config updates sequencially.
// Otherwise, we need to resolve possible races between address and service
// config (e.g. they specify different balancer types).
func (ccr *ccResolverWrapper) watcher() {
for {
select {
case <-ccr.done:
return
default:
}
select {
case addrs := <-ccr.addrCh:
grpclog.Infof("ccResolverWrapper: sending new addresses to balancer wrapper: %v", addrs)
// TODO(bar switching) this should never be nil. Pickfirst should be default.
if ccr.cc.balancerWrapper != nil {
// TODO(bar switching) create balancer if it's nil?
ccr.cc.balancerWrapper.handleResolvedAddrs(addrs, nil)
}
case sc := <-ccr.scCh:
grpclog.Infof("ccResolverWrapper: got new service config: %v", sc)
case <-ccr.done:
return
}
}
}
func (ccr *ccResolverWrapper) close() {
ccr.resolver.Close()
close(ccr.done)
}
// NewAddress is called by the resolver implemenetion to send addresses to gRPC.
func (ccr *ccResolverWrapper) NewAddress(addrs []resolver.Address) {
select {
case <-ccr.addrCh:
default:
}
ccr.addrCh <- addrs
}
// NewServiceConfig is called by the resolver implemenetion to send service
// configs to gPRC.
func (ccr *ccResolverWrapper) NewServiceConfig(sc string) {
select {
case <-ccr.scCh:
default:
}
ccr.scCh <- sc
}