examples/features/compression/client/main.go

/*
 *
 * Copyright 2018 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.
 *
 */

// Binary client demonstrates how to specify compression options when performing
// RPCs.
package main

import (
	"context"
	"flag"
	"fmt"
	"log"
	"time"

	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials/insecure"
	"google.golang.org/grpc/encoding/gzip" // Install the gzip compressor
	pb "google.golang.org/grpc/examples/features/proto/echo"
)

var addr = flag.String("addr", "localhost:50051", "the address to connect to")

func main() {
	flag.Parse()

	// Set up a connection to the server.
	conn, err := grpc.NewClient(*addr, grpc.WithTransportCredentials(insecure.NewCredentials()))
	if err != nil {
		log.Fatalf("did not connect: %v", err)
	}
	defer conn.Close()

	c := pb.NewEchoClient(conn)

	// Send the RPC compressed.  If all RPCs on a client should be sent this
	// way, use the DialOption:
	// grpc.WithDefaultCallOptions(grpc.UseCompressor(gzip.Name))
	const msg = "compress"
	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()
	res, err := c.UnaryEcho(ctx, &pb.EchoRequest{Message: msg}, grpc.UseCompressor(gzip.Name))
	fmt.Printf("UnaryEcho call returned %q, %v\n", res.GetMessage(), err)
	if err != nil || res.GetMessage() != msg {
		log.Fatalf("Message=%q, err=%v; want Message=%q, err=<nil>", res.GetMessage(), err, msg)
	}

}