90 lines
2.9 KiB
Go
90 lines
2.9 KiB
Go
/*
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*
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* Copyright 2022 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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"fmt"
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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/codes"
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"google.golang.org/grpc/credentials/insecure"
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"google.golang.org/grpc/internal/channelz"
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"google.golang.org/grpc/resolver/manual"
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"google.golang.org/grpc/status"
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testgrpc "google.golang.org/grpc/test/grpc_testing"
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testpb "google.golang.org/grpc/test/grpc_testing"
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)
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// TestClientConnClose_WithPendingRPC tests the scenario where the channel has
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// not yet received any update from the name resolver and hence RPCs are
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// blocking. The test verifies that closing the ClientConn unblocks the RPC with
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// the expected error code.
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func (s) TestClientConnClose_WithPendingRPC(t *testing.T) {
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// Initialize channelz. Used to determine pending RPC count.
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czCleanup := channelz.NewChannelzStorageForTesting()
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defer czCleanupWrapper(czCleanup, t)
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r := manual.NewBuilderWithScheme("whatever")
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cc, err := grpc.Dial(r.Scheme()+":///test.server", grpc.WithTransportCredentials(insecure.NewCredentials()), grpc.WithResolvers(r))
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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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client := testgrpc.NewTestServiceClient(cc)
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ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
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defer cancel()
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doneErrCh := make(chan error, 1)
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go func() {
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// This RPC would block until the ClientConn is closed, because the
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// resolver has not provided its first update yet.
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_, err := client.EmptyCall(ctx, &testpb.Empty{})
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if status.Code(err) != codes.Canceled || !strings.Contains(err.Error(), "client connection is closing") {
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doneErrCh <- fmt.Errorf("EmptyCall() = %v, want %s", err, codes.Canceled)
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}
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doneErrCh <- nil
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}()
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// Make sure that there is one pending RPC on the ClientConn before attempting
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// to close it. If we don't do this, cc.Close() can happen before the above
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// goroutine gets to make the RPC.
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for {
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if err := ctx.Err(); err != nil {
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t.Fatal(err)
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}
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tcs, _ := channelz.GetTopChannels(0, 0)
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if len(tcs) != 1 {
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t.Fatalf("there should only be one top channel, not %d", len(tcs))
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}
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started := tcs[0].ChannelData.CallsStarted
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completed := tcs[0].ChannelData.CallsSucceeded + tcs[0].ChannelData.CallsFailed
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if (started - completed) == 1 {
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break
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}
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time.Sleep(defaultTestShortTimeout)
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}
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cc.Close()
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if err := <-doneErrCh; err != nil {
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t.Fatal(err)
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}
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}
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