mirror of https://github.com/grpc/grpc-go.git
82 lines
2.6 KiB
Go
82 lines
2.6 KiB
Go
/*
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*
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* Copyright 2023 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package grpc
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import (
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"fmt"
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"strings"
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"sync"
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"testing"
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"google.golang.org/grpc/balancer"
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"google.golang.org/grpc/credentials/insecure"
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"google.golang.org/grpc/internal/balancer/stub"
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"google.golang.org/grpc/internal/grpcsync"
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)
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// TestBalancer_StateListenerBeforeConnect tries to stimulate a race between
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// NewSubConn and ClientConn.Close. In no cases should the SubConn's
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// StateListener be invoked, because Connect was never called.
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func (s) TestBalancer_StateListenerBeforeConnect(t *testing.T) {
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// started is fired after cc is set so cc can be used in the balancer.
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started := grpcsync.NewEvent()
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var cc *ClientConn
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wg := sync.WaitGroup{}
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wg.Add(2)
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// Create a balancer that calls NewSubConn and cc.Close at approximately the
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// same time.
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bf := stub.BalancerFuncs{
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UpdateClientConnState: func(bd *stub.BalancerData, ccs balancer.ClientConnState) error {
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go func() {
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// Wait for cc to be valid after the channel is created.
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<-started.Done()
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// In a goroutine, create the subconn.
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go func() {
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_, err := bd.ClientConn.NewSubConn(ccs.ResolverState.Addresses, balancer.NewSubConnOptions{
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StateListener: func(scs balancer.SubConnState) {
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t.Error("Unexpected call to StateListener with:", scs)
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},
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})
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if err != nil && !strings.Contains(err.Error(), "connection is closing") && !strings.Contains(err.Error(), "is deleted") && !strings.Contains(err.Error(), "is closed or idle") && !strings.Contains(err.Error(), "balancer is being closed") {
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t.Error("Unexpected error creating subconn:", err)
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}
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wg.Done()
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}()
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// At approximately the same time, close the channel.
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cc.Close()
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wg.Done()
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}()
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return nil
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},
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}
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stub.Register(t.Name(), bf)
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svcCfg := fmt.Sprintf(`{ "loadBalancingConfig": [{%q: {}}] }`, t.Name())
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cc, err := Dial("fake", WithTransportCredentials(insecure.NewCredentials()), WithDefaultServiceConfig(svcCfg))
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if err != nil {
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t.Fatal("Error dialing:", err)
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}
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started.Fire()
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// Wait for the LB policy to call NewSubConn and cc.Close.
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wg.Wait()
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}
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