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/*
*
* 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 is an example client.
package main
import (
"context"
"flag"
"fmt"
"log"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
pb "google.golang.org/grpc/examples/features/proto/echo"
"google.golang.org/grpc/status"
)
var addr = flag.String("addr", "localhost:50052", "the address to connect to")
func unaryCall(c pb.EchoClient, requestID int, message string, want codes.Code) {
// Creates a context with a one second deadline for the RPC.
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
req := &pb.EchoRequest{Message: message}
_, err := c.UnaryEcho(ctx, req)
got := status.Code(err)
fmt.Printf("[%v] wanted = %v, got = %v\n", requestID, want, got)
}
func streamingCall(c pb.EchoClient, requestID int, message string, want codes.Code) {
// Creates a context with a one second deadline for the RPC.
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
stream, err := c.BidirectionalStreamingEcho(ctx)
if err != nil {
log.Printf("Stream err: %v", err)
return
}
err = stream.Send(&pb.EchoRequest{Message: message})
if err != nil {
log.Printf("Send error: %v", err)
return
}
_, err = stream.Recv()
got := status.Code(err)
fmt.Printf("[%v] wanted = %v, got = %v\n", requestID, want, got)
}
func main() {
flag.Parse()
conn, err := grpc.Dial(*addr, grpc.WithInsecure(), grpc.WithBlock())
if err != nil {
log.Fatalf("did not connect: %v", err)
}
defer conn.Close()
c := pb.NewEchoClient(conn)
// A successful request
unaryCall(c, 1, "world", codes.OK)
// Exceeds deadline
unaryCall(c, 2, "delay", codes.DeadlineExceeded)
// A successful request with propagated deadline
unaryCall(c, 3, "[propagate me]world", codes.OK)
// Exceeds propagated deadline
unaryCall(c, 4, "[propagate me][propagate me]world", codes.DeadlineExceeded)
// Receives a response from the stream successfully.
streamingCall(c, 5, "[propagate me]world", codes.OK)
// Exceeds propagated deadline before receiving a response
streamingCall(c, 6, "[propagate me][propagate me]world", codes.DeadlineExceeded)
}
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