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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| /* | ||
| * | ||
| * Copyright 2023 gRPC authors. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| * | ||
| */ | ||
|
|
||
| package grpc_test | ||
|
|
||
| import ( | ||
| "context" | ||
| "io" | ||
| "testing" | ||
| "time" | ||
|
|
||
| "google.golang.org/grpc" | ||
| "google.golang.org/grpc/internal/grpcsync" | ||
| "google.golang.org/grpc/internal/stubserver" | ||
|
|
||
| testgrpc "google.golang.org/grpc/interop/grpc_testing" | ||
| ) | ||
|
|
||
| // TestServer_MaxHandlers ensures that no more than MaxConcurrentStreams server | ||
| // handlers are active at one time. | ||
| func (s) TestServer_MaxHandlers(t *testing.T) { | ||
| started := make(chan struct{}) | ||
| blockCalls := grpcsync.NewEvent() | ||
|
|
||
| // This stub server does not properly respect the stream context, so it will | ||
| // not exit when the context is canceled. | ||
| ss := stubserver.StubServer{ | ||
| FullDuplexCallF: func(stream testgrpc.TestService_FullDuplexCallServer) error { | ||
| started <- struct{}{} | ||
| <-blockCalls.Done() | ||
| return nil | ||
| }, | ||
| } | ||
| if err := ss.Start([]grpc.ServerOption{grpc.MaxConcurrentStreams(1)}); err != nil { | ||
| t.Fatal("Error starting server:", err) | ||
| } | ||
| defer ss.Stop() | ||
|
|
||
| ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout) | ||
| defer cancel() | ||
|
|
||
| // Start one RPC to the server. | ||
| ctx1, cancel1 := context.WithCancel(ctx) | ||
| _, err := ss.Client.FullDuplexCall(ctx1) | ||
| if err != nil { | ||
| t.Fatal("Error staring call:", err) | ||
| } | ||
|
|
||
| // Wait for the handler to be invoked. | ||
| select { | ||
| case <-started: | ||
| case <-ctx.Done(): | ||
| t.Fatalf("Timed out waiting for RPC to start on server.") | ||
| } | ||
|
|
||
| // Cancel it on the client. The server handler will still be running. | ||
| cancel1() | ||
|
|
||
| ctx2, cancel2 := context.WithCancel(ctx) | ||
| defer cancel2() | ||
| s, err := ss.Client.FullDuplexCall(ctx2) | ||
| if err != nil { | ||
| t.Fatal("Error staring call:", err) | ||
| } | ||
|
|
||
| // After 100ms, allow the first call to unblock. That should allow the | ||
| // second RPC to run and finish. | ||
| select { | ||
| case <-started: | ||
| blockCalls.Fire() | ||
| t.Fatalf("RPC started unexpectedly.") | ||
| case <-time.After(100 * time.Millisecond): | ||
| blockCalls.Fire() | ||
| } | ||
|
|
||
| select { | ||
| case <-started: | ||
| case <-ctx.Done(): | ||
| t.Fatalf("Timed out waiting for second RPC to start on server.") | ||
| } | ||
| if _, err := s.Recv(); err != io.EOF { | ||
| t.Fatal("Received unexpected RPC error:", err) | ||
| } | ||
| } |