mirror of https://github.com/grpc/grpc-go.git
100 lines
2.6 KiB
Go
100 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_test
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import (
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"context"
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"io"
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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/internal/grpcsync"
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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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// TestServer_MaxHandlers ensures that no more than MaxConcurrentStreams server
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// handlers are active at one time.
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func (s) TestServer_MaxHandlers(t *testing.T) {
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started := make(chan struct{})
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blockCalls := grpcsync.NewEvent()
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// This stub server does not properly respect the stream context, so it will
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// not exit when the context is canceled.
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ss := stubserver.StubServer{
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FullDuplexCallF: func(stream testgrpc.TestService_FullDuplexCallServer) error {
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started <- struct{}{}
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<-blockCalls.Done()
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return nil
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},
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}
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if err := ss.Start([]grpc.ServerOption{grpc.MaxConcurrentStreams(1)}); 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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ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
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defer cancel()
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// Start one RPC to the server.
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ctx1, cancel1 := context.WithCancel(ctx)
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_, err := ss.Client.FullDuplexCall(ctx1)
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if err != nil {
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t.Fatal("Error staring call:", err)
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}
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// Wait for the handler to be invoked.
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select {
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case <-started:
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case <-ctx.Done():
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t.Fatalf("Timed out waiting for RPC to start on server.")
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}
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// Cancel it on the client. The server handler will still be running.
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cancel1()
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ctx2, cancel2 := context.WithCancel(ctx)
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defer cancel2()
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s, err := ss.Client.FullDuplexCall(ctx2)
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if err != nil {
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t.Fatal("Error staring call:", err)
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}
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// After 100ms, allow the first call to unblock. That should allow the
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// second RPC to run and finish.
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select {
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case <-started:
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blockCalls.Fire()
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t.Fatalf("RPC started unexpectedly.")
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case <-time.After(100 * time.Millisecond):
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blockCalls.Fire()
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}
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select {
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case <-started:
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case <-ctx.Done():
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t.Fatalf("Timed out waiting for second RPC to start on server.")
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}
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if _, err := s.Recv(); err != io.EOF {
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t.Fatal("Received unexpected RPC error:", err)
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}
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}
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