mirror of https://github.com/grpc/grpc-go.git
115 lines
2.7 KiB
Go
115 lines
2.7 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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// Binary client demonstrates how to receive metadata in RPC headers
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// and trailers.
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package main
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import (
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"context"
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"flag"
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"fmt"
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"io"
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"log"
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"time"
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"google.golang.org/grpc"
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"google.golang.org/grpc/credentials/insecure"
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"google.golang.org/grpc/metadata"
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pb "google.golang.org/grpc/examples/features/proto/echo"
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)
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var addr = flag.String("addr", "localhost:50051", "the address to connect to")
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func callUnaryEcho(ctx context.Context, client pb.EchoClient) {
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var header, trailer metadata.MD
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resp, err := client.UnaryEcho(ctx, &pb.EchoRequest{Message: "hello world"}, grpc.Header(&header), grpc.Trailer(&trailer))
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if err != nil {
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log.Fatalf("UnaryEcho: %v", err)
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}
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fmt.Println("UnaryEcho: ", resp.Message)
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fmt.Println("Received headers:")
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for k, v := range header {
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fmt.Printf("%s: %v\n", k, v)
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}
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fmt.Println("Received trailers:")
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for k, v := range trailer {
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fmt.Printf("%s: %v\n", k, v)
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}
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}
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func callBidiStreamingEcho(ctx context.Context, client pb.EchoClient) {
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c, err := client.BidirectionalStreamingEcho(ctx)
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if err != nil {
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log.Fatalf("BidiStreamingEcho: %v", err)
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}
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if err := c.Send(&pb.EchoRequest{Message: "hello world"}); err != nil {
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log.Fatalf("Sending echo request: %v", err)
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}
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c.CloseSend()
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for {
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resp, err := c.Recv()
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if err == io.EOF {
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break
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}
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if err != nil {
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log.Fatalf("Receiving echo response: %v", err)
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}
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fmt.Println("BidiStreaming Echo: ", resp.Message)
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}
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header, err := c.Header()
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if err != nil {
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log.Fatalf("Receiving headers: %v", err)
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}
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fmt.Println("Received headers:")
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for k, v := range header {
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fmt.Printf("%s: %v\n", k, v)
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}
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trailer := c.Trailer()
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fmt.Println("Received tailers:")
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for k, v := range trailer {
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fmt.Printf("%s: %v\n", k, v)
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}
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}
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func main() {
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flag.Parse()
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conn, err := grpc.NewClient(*addr, grpc.WithTransportCredentials(insecure.NewCredentials()))
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if err != nil {
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log.Fatalf("grpc.NewClient(%q): %v", *addr, err)
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}
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defer conn.Close()
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ec := pb.NewEchoClient(conn)
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ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
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defer cancel()
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callUnaryEcho(ctx, ec)
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callBidiStreamingEcho(ctx, ec)
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}
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