mirror of https://github.com/grpc/grpc-go.git
109 lines
2.9 KiB
Go
109 lines
2.9 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 test
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import (
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"context"
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"testing"
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"google.golang.org/grpc"
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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"
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"google.golang.org/grpc/internal/grpcsync"
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"google.golang.org/grpc/internal/stubserver"
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"google.golang.org/grpc/resolver"
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"google.golang.org/grpc/resolver/manual"
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)
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type testSubscriber struct {
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onMsgCh chan connectivity.State
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}
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func newTestSubscriber() *testSubscriber {
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return &testSubscriber{onMsgCh: make(chan connectivity.State, 1)}
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}
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func (ts *testSubscriber) OnMessage(msg interface{}) {
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select {
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case ts.onMsgCh <- msg.(connectivity.State):
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default:
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}
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}
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func (s) TestConnectivityStateUpdates(t *testing.T) {
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ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
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defer cancel()
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// Create a ClientConn with a short idle_timeout.
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r := manual.NewBuilderWithScheme("whatever")
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dopts := []grpc.DialOption{
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grpc.WithTransportCredentials(insecure.NewCredentials()),
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grpc.WithResolvers(r),
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grpc.WithIdleTimeout(defaultTestShortIdleTimeout),
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}
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cc, err := grpc.Dial(r.Scheme()+":///test.server", dopts...)
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if err != nil {
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t.Fatalf("grpc.Dial() failed: %v", err)
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}
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t.Cleanup(func() { cc.Close() })
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s := newTestSubscriber()
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internal.SubscribeToConnectivityStateChanges.(func(cc *grpc.ClientConn, s grpcsync.Subscriber) func())(cc, s)
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backend := stubserver.StartTestService(t, nil)
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t.Cleanup(backend.Stop)
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wantStates := []connectivity.State{
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connectivity.Connecting,
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connectivity.Ready,
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connectivity.Idle,
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connectivity.Shutdown,
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}
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doneCh := make(chan struct{})
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go func() {
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defer close(doneCh)
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for _, wantState := range wantStates {
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select {
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case gotState := <-s.onMsgCh:
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if gotState != wantState {
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t.Errorf("Received unexpected state: %q; want: %q", gotState, wantState)
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}
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case <-ctx.Done():
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t.Error("Timeout when expecting the onMessage() callback to be invoked")
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}
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if t.Failed() {
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break
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}
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}
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}()
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// Verify that the ClientConn moves to READY.
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r.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: backend.Address}}})
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// Verify that the ClientConn moves to IDLE as there is no activity.
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awaitState(ctx, t, cc, connectivity.Idle)
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cc.Close()
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awaitState(ctx, t, cc, connectivity.Shutdown)
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<-doneCh
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}
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