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main.go
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main.go
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// Copyright 2017, OpenCensus 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 (
"log"
"net/http"
"os"
"time"
"go.opencensus.io/examples/grpc/exporter"
pb "go.opencensus.io/examples/grpc/proto"
"go.opencensus.io/plugin/ocgrpc"
"go.opencensus.io/plugin/ocgrpc/grpcstats"
"go.opencensus.io/stats/view"
"go.opencensus.io/zpages"
"golang.org/x/net/context"
"google.golang.org/grpc"
)
const (
address = "localhost:50051"
defaultName = "world"
)
func main() {
zpages.AddDefaultHTTPHandlers()
go func() { log.Fatal(http.ListenAndServe(":8080", nil)) }()
// Register stats and trace exporters to export
// the collected data.
view.RegisterExporter(&exporter.Exporter{})
// Subscribe to collect client request count.
if err := grpcstats.RPCClientRequestCountView.Subscribe(); err != nil {
log.Fatal(err)
}
// Set up a connection to the server with the OpenCensus
// stats handler to enable stats and tracing.
conn, err := grpc.Dial(address, grpc.WithStatsHandler(ocgrpc.NewClientStatsHandler()), grpc.WithInsecure())
if err != nil {
log.Fatalf("did not connect: %v", err)
}
defer conn.Close()
c := pb.NewGreeterClient(conn)
// Contact the server and print out its response.
name := defaultName
if len(os.Args) > 1 {
name = os.Args[1]
}
view.SetReportingPeriod(time.Second)
for {
r, err := c.SayHello(context.Background(), &pb.HelloRequest{Name: name})
if err != nil {
log.Fatalf("could not greet: %v", err)
}
log.Printf("Greeting: %s", r.Message)
time.Sleep(2 * time.Second) // Wait for the data collection.
}
}