Last active
December 22, 2018 00:24
-
-
Save lyuxuan/515fa6da7e0924b030e29b8be56fd90a to your computer and use it in GitHub Desktop.
Channelz Demo: Client
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* | |
* | |
* 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. | |
* | |
*/ | |
package main | |
import ( | |
"fmt" | |
"log" | |
"net" | |
"os" | |
"os/signal" | |
"time" | |
"golang.org/x/net/context" | |
"google.golang.org/grpc" | |
"google.golang.org/grpc/channelz/service" | |
pb "google.golang.org/grpc/examples/helloworld/helloworld" | |
"google.golang.org/grpc/internal/channelz" | |
"google.golang.org/grpc/resolver" | |
"google.golang.org/grpc/resolver/manual" | |
) | |
const ( | |
defaultName = "world" | |
) | |
func main() { | |
/***** Set up the server serving channelz service. *****/ | |
lis, err := net.Listen("tcp", ":50050") | |
if err != nil { | |
log.Fatalf("failed to listen: %v", err) | |
} | |
s := grpc.NewServer() | |
service.RegisterChannelzServiceToServer(s) | |
go s.Serve(lis) | |
defer s.Stop() | |
/***** Initialize manual resolver and Dial *****/ | |
r, rcleanup := manual.GenerateAndRegisterManualResolver() | |
defer rcleanup() | |
// Set up a connection to the server. | |
conn, err := grpc.Dial(r.Scheme()+":///test.server", grpc.WithInsecure(), grpc.WithBalancerName("round_robin")) | |
if err != nil { | |
log.Fatalf("did not connect: %v", err) | |
} | |
defer conn.Close() | |
// Manually provide resolved addresses for the target. | |
r.NewAddress([]resolver.Address{{Addr: ":10001"}, {Addr: ":10002"}, {Addr: ":10003"}}) | |
c := pb.NewGreeterClient(conn) | |
// Contact the server and print out its response. | |
name := defaultName | |
if len(os.Args) > 1 { | |
name = os.Args[1] | |
} | |
/***** Make 100 SayHello RPCs *****/ | |
for i := 0; i < 100; i++ { | |
// Setting a 150ms timeout on the RPC. | |
ctx, cancel := context.WithTimeout(context.Background(), 150*time.Millisecond) | |
defer cancel() | |
r, err := c.SayHello(ctx, &pb.HelloRequest{Name: name}) | |
if err != nil { | |
log.Printf("could not greet: %v", err) | |
} else { | |
log.Printf("Greeting: %s", r.Message) | |
} | |
} | |
/***** Wait for CTRL+C to exit *****/ | |
// Unless you exit the program with CTRL+C, channelz data will be available for querying. | |
// Users can take time to examine and learn about the info provided by channelz. | |
ch := make(chan os.Signal, 1) | |
signal.Notify(ch, os.Interrupt) | |
// Block until a signal is received. | |
<-ch | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment