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/*
*
* Copyright 2019 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 is an example client.
package main
import (
"context"
"flag"
"fmt"
"log"
"time"
"google.golang.org/grpc"
pb "google.golang.org/grpc/examples/features/proto/echo"
"google.golang.org/grpc/keepalive"
)
var addr = flag.String("addr", "localhost:50052", "the address to connect to")
var kacp = keepalive.ClientParameters{
Time: 10 * time.Second, // send pings every 10 seconds if there is no activity
Timeout: time.Second, // wait 1 second for ping ack before considering the connection dead
PermitWithoutStream: true, // send pings even without active streams
}
func main() {
flag.Parse()
conn, err := grpc.Dial(*addr, grpc.WithInsecure(), grpc.WithKeepaliveParams(kacp))
if err != nil {
log.Fatalf("did not connect: %v", err)
}
defer conn.Close()
c := pb.NewEchoClient(conn)
ctx, cancel := context.WithTimeout(context.Background(), 3*time.Minute)
defer cancel()
fmt.Println("Performing unary request")
res, err := c.UnaryEcho(ctx, &pb.EchoRequest{Message: "keepalive demo"})
if err != nil {
log.Fatalf("unexpected error from UnaryEcho: %v", err)
}
fmt.Println("RPC response:", res)
select {} // Block forever; run with GODEBUG=http2debug=2 to observe ping frames and GOAWAYs due to idleness.
}
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