91 строка
3.2 KiB
Go
91 строка
3.2 KiB
Go
/*
|
|
*
|
|
* Copyright 2019 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 (
|
|
"fmt"
|
|
"net"
|
|
"testing"
|
|
|
|
"google.golang.org/grpc/balancer"
|
|
"google.golang.org/grpc/balancer/roundrobin"
|
|
"google.golang.org/grpc/internal/balancer/stub"
|
|
"google.golang.org/grpc/resolver"
|
|
"google.golang.org/grpc/resolver/manual"
|
|
)
|
|
|
|
// TestBalancerErrorResolverPolling injects balancer errors and verifies
|
|
// ResolveNow is called on the resolver with the appropriate backoff strategy
|
|
// being consulted between ResolveNow calls.
|
|
func (s) TestBalancerErrorResolverPolling(t *testing.T) {
|
|
// The test balancer will return ErrBadResolverState iff the
|
|
// ClientConnState contains no addresses.
|
|
bf := stub.BalancerFuncs{
|
|
UpdateClientConnState: func(_ *stub.BalancerData, s balancer.ClientConnState) error {
|
|
if len(s.ResolverState.Addresses) == 0 {
|
|
return balancer.ErrBadResolverState
|
|
}
|
|
return nil
|
|
},
|
|
}
|
|
const balName = "BalancerErrorResolverPolling"
|
|
stub.Register(balName, bf)
|
|
|
|
testResolverErrorPolling(t,
|
|
func(r *manual.Resolver) {
|
|
// No addresses so the balancer will fail.
|
|
r.CC.UpdateState(resolver.State{})
|
|
}, func(r *manual.Resolver) {
|
|
// UpdateState will block if ResolveNow is being called (which blocks on
|
|
// rn), so call it in a goroutine. Include some address so the balancer
|
|
// will be happy.
|
|
go r.CC.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: "x"}}})
|
|
},
|
|
WithDefaultServiceConfig(fmt.Sprintf(`{ "loadBalancingConfig": [{"%v": {}}] }`, balName)))
|
|
}
|
|
|
|
// TestRoundRobinZeroAddressesResolverPolling reports no addresses to the round
|
|
// robin balancer and verifies ResolveNow is called on the resolver with the
|
|
// appropriate backoff strategy being consulted between ResolveNow calls.
|
|
func (s) TestRoundRobinZeroAddressesResolverPolling(t *testing.T) {
|
|
// We need to start a real server or else the connecting loop will call
|
|
// ResolveNow after every iteration, even after a valid resolver result is
|
|
// returned.
|
|
lis, err := net.Listen("tcp", "localhost:0")
|
|
if err != nil {
|
|
t.Fatalf("Error while listening. Err: %v", err)
|
|
}
|
|
defer lis.Close()
|
|
s := NewServer()
|
|
defer s.Stop()
|
|
go s.Serve(lis)
|
|
|
|
testResolverErrorPolling(t,
|
|
func(r *manual.Resolver) {
|
|
// No addresses so the balancer will fail.
|
|
r.CC.UpdateState(resolver.State{})
|
|
}, func(r *manual.Resolver) {
|
|
// UpdateState will block if ResolveNow is being called (which
|
|
// blocks on rn), so call it in a goroutine. Include a valid
|
|
// address so the balancer will be happy.
|
|
go r.CC.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: lis.Addr().String()}}})
|
|
},
|
|
WithDefaultServiceConfig(fmt.Sprintf(`{ "loadBalancingConfig": [{"%v": {}}] }`, roundrobin.Name)))
|
|
}
|