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main.go
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main.go
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// Copyright 2019 Google LLC
//
// 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 wraps the client library in a gRPC interface that a benchmarker
// can communicate through.
package main
import (
"context"
"flag"
"fmt"
"log"
"net"
"os"
"strings"
"cloud.google.com/go/pubsub"
pb "cloud.google.com/go/pubsub/internal/benchwrapper/proto"
"google.golang.org/grpc"
"google.golang.org/grpc/status"
)
var port = flag.String("port", "", "specify a port to run on")
func main() {
flag.Parse()
if *port == "" {
log.Fatalf("usage: %s --port=8081", os.Args[0])
}
if os.Getenv("PUBSUB_EMULATOR_HOST") == "" {
log.Fatal("This benchmarking server only works when connected to an emulator. Please set PUBSUB_EMULATOR_HOST.")
}
ctx := context.Background()
c, err := pubsub.NewClient(ctx, "someproject")
if err != nil {
log.Fatal(err)
}
lis, err := net.Listen("tcp", fmt.Sprintf(":%s", *port))
if err != nil {
log.Fatal(err)
}
s := grpc.NewServer()
pb.RegisterPubsubBenchWrapperServer(s, &server{
c: c,
})
log.Printf("Running on localhost:%s\n", *port)
log.Fatal(s.Serve(lis))
}
type server struct {
c *pubsub.Client
}
func (s *server) Recv(ctx context.Context, req *pb.PubsubRecv) (*pb.EmptyResponse, error) {
sub := s.c.Subscription(req.SubName)
sub.ReceiveSettings.NumGoroutines = 1
err := sub.Receive(ctx, func(ctx context.Context, msg *pubsub.Message) {
msg.Ack()
})
if err != nil {
s, _ := status.FromError(err)
// Return success on server initiated EOF, which is expected.
if strings.Contains(s.Message(), "EOF") {
return &pb.EmptyResponse{}, nil
}
return nil, err
}
return &pb.EmptyResponse{}, nil
}