rpc_util: add a TestRecvBufferPool

Author: hueypark

test/recv_buffer_pool_test.go

@@ -0,0 +1,90 @@
+/*
+ *
+ * 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 test
+
+import (
+	"bytes"
+	"context"
+	"io"
+	"testing"
+	"time"
+
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/internal/stubserver"
+	testgrpc "google.golang.org/grpc/interop/grpc_testing"
+	testpb "google.golang.org/grpc/interop/grpc_testing"
+)
+
+func (s) TestRecvBufferPool(t *testing.T) {
+	ss := &stubserver.StubServer{
+		FullDuplexCallF: func(stream testgrpc.TestService_FullDuplexCallServer) error {
+			for i := 0; i < 10; i++ {
+				preparedMsg := &grpc.PreparedMsg{}
+				err := preparedMsg.Encode(stream, &testpb.StreamingOutputCallResponse{
+					Payload: &testpb.Payload{
+						Body: []byte{'0' + uint8(i)},
+					},
+				})
+				if err != nil {
+					return err
+				}
+				stream.SendMsg(preparedMsg)
+			}
+			return nil
+		},
+	}
+	if err := ss.Start(
+		[]grpc.ServerOption{grpc.RecvBufferPool(grpc.NewsimpleSharedBufferPool())},
+		grpc.WithRecvBufferPool(grpc.NewsimpleSharedBufferPool()),
+	); err != nil {
+		t.Fatalf("Error starting endpoint server: %v", err)
+	}
+	defer ss.Stop()
+
+	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+	defer cancel()
+
+	stream, err := ss.Client.FullDuplexCall(ctx)
+	if err != nil {
+		t.Fatalf("ss.Client.FullDuplexCall failed: %f", err)
+	}
+
+	var ngot int
+	var buf bytes.Buffer
+	for {
+		reply, err := stream.Recv()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			t.Fatal(err)
+		}
+		ngot++
+		if buf.Len() > 0 {
+			buf.WriteByte(',')
+		}
+		buf.Write(reply.GetPayload().GetBody())
+	}
+	if want := 10; ngot != want {
+		t.Errorf("Got %d replies, want %d", ngot, want)
+	}
+	if got, want := buf.String(), "0,1,2,3,4,5,6,7,8,9"; got != want {
+		t.Errorf("Got replies %q; want %q", got, want)
+	}
+}