mirror of https://github.com/grpc/grpc-go.git
126 lines
3.5 KiB
Go
126 lines
3.5 KiB
Go
/*
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*
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* Copyright 2024 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_test
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import (
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"context"
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"strings"
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"testing"
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"time"
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"google.golang.org/grpc"
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"google.golang.org/grpc/balancer"
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"google.golang.org/grpc/connectivity"
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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/stubserver"
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testgrpc "google.golang.org/grpc/interop/grpc_testing"
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)
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type producerBuilder struct{}
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type producer struct {
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client testgrpc.TestServiceClient
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stopped chan struct{}
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}
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// Build constructs and returns a producer and its cleanup function
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func (*producerBuilder) Build(cci any) (balancer.Producer, func()) {
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p := &producer{
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client: testgrpc.NewTestServiceClient(cci.(grpc.ClientConnInterface)),
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stopped: make(chan struct{}),
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}
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return p, func() {
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<-p.stopped
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}
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}
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func (p *producer) TestStreamStart(t *testing.T, streamStarted chan<- struct{}) {
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go func() {
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defer close(p.stopped)
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ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
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defer cancel()
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if _, err := p.client.FullDuplexCall(ctx); err != nil {
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t.Errorf("Unexpected error starting stream: %v", err)
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}
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close(streamStarted)
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}()
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}
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var producerBuilderSingleton = &producerBuilder{}
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// TestProducerStreamStartsAfterReady ensures producer streams only start after
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// the subchannel reports as READY to the LB policy.
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func (s) TestProducerStreamStartsAfterReady(t *testing.T) {
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name := strings.ReplaceAll(strings.ToLower(t.Name()), "/", "")
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producerCh := make(chan balancer.Producer)
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streamStarted := make(chan struct{})
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done := make(chan struct{})
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bf := stub.BalancerFuncs{
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UpdateClientConnState: func(bd *stub.BalancerData, ccs balancer.ClientConnState) error {
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sc, err := bd.ClientConn.NewSubConn(ccs.ResolverState.Addresses, balancer.NewSubConnOptions{
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StateListener: func(scs balancer.SubConnState) {
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if scs.ConnectivityState == connectivity.Ready {
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timer := time.NewTimer(5 * time.Millisecond)
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select {
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case <-streamStarted:
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t.Errorf("Producer stream started before Ready listener returned")
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case <-timer.C:
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}
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close(done)
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}
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},
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})
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if err != nil {
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return err
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}
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producer, _ := sc.GetOrBuildProducer(producerBuilderSingleton)
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producerCh <- producer
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sc.Connect()
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return nil
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},
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}
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stub.Register(name, bf)
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ss := stubserver.StubServer{
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FullDuplexCallF: func(stream testgrpc.TestService_FullDuplexCallServer) error {
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return nil
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},
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}
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if err := ss.StartServer(); err != nil {
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t.Fatal("Error starting server:", err)
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}
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defer ss.Stop()
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cc, err := grpc.NewClient("dns:///"+ss.Address,
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grpc.WithDefaultServiceConfig(`{"loadBalancingConfig": [{"`+name+`":{}}]}`),
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grpc.WithTransportCredentials(insecure.NewCredentials()),
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)
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if err != nil {
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t.Fatalf("Error creating client: %v", err)
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}
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defer cc.Close()
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go cc.Connect()
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p := <-producerCh
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p.(*producer).TestStreamStart(t, streamStarted)
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<-done
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}
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