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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.
//go:generate protoc -I ../proto --go_out=plugins=grpc:../proto ../proto/helloworld.proto
package main
import (
"log"
"math/rand"
"net"
"net/http"
"time"
"go.opencensus.io/examples/exporter"
pb "go.opencensus.io/examples/grpc/proto"
"go.opencensus.io/plugin/ocgrpc"
"go.opencensus.io/stats/view"
"go.opencensus.io/trace"
"go.opencensus.io/zpages"
"golang.org/x/net/context"
"google.golang.org/grpc"
)
const port = ":50051"
// server is used to implement helloworld.GreeterServer.
type server struct{}
// SayHello implements helloworld.GreeterServer
func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {
ctx, span := trace.StartSpan(ctx, "sleep")
time.Sleep(time.Duration(rand.Float64() * float64(time.Second)))
span.End()
return &pb.HelloReply{Message: "Hello " + in.Name}, nil
}
func main() {
go func() {
http.Handle("/debug/", http.StripPrefix("/debug", zpages.Handler))
log.Fatal(http.ListenAndServe(":8081", nil))
}()
// Register stats and trace exporters to export
// the collected data.
view.RegisterExporter(&exporter.PrintExporter{})
// Register the views to collect server request count.
if err := view.Register(ocgrpc.DefaultServerViews...); err != nil {
log.Fatal(err)
}
lis, err := net.Listen("tcp", port)
if err != nil {
log.Fatalf("Failed to listen: %v", err)
}
// Set up a new server with the OpenCensus
// stats handler to enable stats and tracing.
s := grpc.NewServer(grpc.StatsHandler(&ocgrpc.ServerHandler{}))
pb.RegisterGreeterServer(s, &server{})
if err := s.Serve(lis); err != nil {
log.Fatalf("Failed to serve: %v", err)
}
}