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main.go
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main.go
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// Copyright 2018 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
import (
"fmt"
"net"
"os"
"time"
"cloud.google.com/go/profiler"
"contrib.go.opencensus.io/exporter/jaeger"
"contrib.go.opencensus.io/exporter/stackdriver"
"github.com/sirupsen/logrus"
"go.opencensus.io/plugin/ocgrpc"
"go.opencensus.io/stats/view"
"go.opencensus.io/trace"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/reflection"
"google.golang.org/grpc/status"
pb "github.com/GoogleCloudPlatform/microservices-demo/src/shippingservice/genproto"
healthpb "google.golang.org/grpc/health/grpc_health_v1"
)
const (
defaultPort = "50051"
)
var log *logrus.Logger
func init() {
log = logrus.New()
log.Level = logrus.DebugLevel
log.Formatter = &logrus.JSONFormatter{
FieldMap: logrus.FieldMap{
logrus.FieldKeyTime: "timestamp",
logrus.FieldKeyLevel: "severity",
logrus.FieldKeyMsg: "message",
},
TimestampFormat: time.RFC3339Nano,
}
log.Out = os.Stdout
}
func main() {
if os.Getenv("DISABLE_TRACING") == "" {
log.Info("Tracing enabled.")
go initTracing()
} else {
log.Info("Tracing disabled.")
}
if os.Getenv("DISABLE_PROFILER") == "" {
log.Info("Profiling enabled.")
go initProfiling("shippingservice", "1.0.0")
} else {
log.Info("Profiling disabled.")
}
port := defaultPort
if value, ok := os.LookupEnv("PORT"); ok {
port = value
}
port = fmt.Sprintf(":%s", port)
lis, err := net.Listen("tcp", port)
if err != nil {
log.Fatalf("failed to listen: %v", err)
}
var srv *grpc.Server
if os.Getenv("DISABLE_STATS") == "" {
log.Info("Stats enabled.")
srv = grpc.NewServer(grpc.StatsHandler(&ocgrpc.ServerHandler{}))
} else {
log.Info("Stats disabled.")
srv = grpc.NewServer()
}
svc := &server{}
pb.RegisterShippingServiceServer(srv, svc)
healthpb.RegisterHealthServer(srv, svc)
log.Infof("Shipping Service listening on port %s", port)
// Register reflection service on gRPC server.
reflection.Register(srv)
if err := srv.Serve(lis); err != nil {
log.Fatalf("failed to serve: %v", err)
}
}
// server controls RPC service responses.
type server struct{}
// Check is for health checking.
func (s *server) Check(ctx context.Context, req *healthpb.HealthCheckRequest) (*healthpb.HealthCheckResponse, error) {
return &healthpb.HealthCheckResponse{Status: healthpb.HealthCheckResponse_SERVING}, nil
}
func (s *server) Watch(req *healthpb.HealthCheckRequest, ws healthpb.Health_WatchServer) error {
return status.Errorf(codes.Unimplemented, "health check via Watch not implemented")
}
// GetQuote produces a shipping quote (cost) in USD.
func (s *server) GetQuote(ctx context.Context, in *pb.GetQuoteRequest) (*pb.GetQuoteResponse, error) {
log.Info("[GetQuote] received request")
defer log.Info("[GetQuote] completed request")
// 1. Our quote system requires the total number of items to be shipped.
count := 0
for _, item := range in.Items {
count += int(item.Quantity)
}
// 2. Generate a quote based on the total number of items to be shipped.
quote := CreateQuoteFromCount(count)
// 3. Generate a response.
return &pb.GetQuoteResponse{
CostUsd: &pb.Money{
CurrencyCode: "USD",
Units: int64(quote.Dollars),
Nanos: int32(quote.Cents * 10000000)},
}, nil
}
// ShipOrder mocks that the requested items will be shipped.
// It supplies a tracking ID for notional lookup of shipment delivery status.
func (s *server) ShipOrder(ctx context.Context, in *pb.ShipOrderRequest) (*pb.ShipOrderResponse, error) {
log.Info("[ShipOrder] received request")
defer log.Info("[ShipOrder] completed request")
// 1. Create a Tracking ID
baseAddress := fmt.Sprintf("%s, %s, %s", in.Address.StreetAddress, in.Address.City, in.Address.State)
id := CreateTrackingId(baseAddress)
// 2. Generate a response.
return &pb.ShipOrderResponse{
TrackingId: id,
}, nil
}
func initJaegerTracing() {
svcAddr := os.Getenv("JAEGER_SERVICE_ADDR")
if svcAddr == "" {
log.Info("jaeger initialization disabled.")
return
}
// Register the Jaeger exporter to be able to retrieve
// the collected spans.
exporter, err := jaeger.NewExporter(jaeger.Options{
Endpoint: fmt.Sprintf("http://%s", svcAddr),
Process: jaeger.Process{
ServiceName: "shippingservice",
},
})
if err != nil {
log.Fatal(err)
}
trace.RegisterExporter(exporter)
log.Info("jaeger initialization completed.")
}
func initStats(exporter *stackdriver.Exporter) {
view.SetReportingPeriod(60 * time.Second)
view.RegisterExporter(exporter)
if err := view.Register(ocgrpc.DefaultServerViews...); err != nil {
log.Warn("Error registering default server views")
} else {
log.Info("Registered default server views")
}
}
func initStackdriverTracing() {
// TODO(ahmetb) this method is duplicated in other microservices using Go
// since they are not sharing packages.
for i := 1; i <= 3; i++ {
exporter, err := stackdriver.NewExporter(stackdriver.Options{})
if err != nil {
log.Warnf("failed to initialize Stackdriver exporter: %+v", err)
} else {
trace.RegisterExporter(exporter)
trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
log.Info("registered Stackdriver tracing")
// Register the views to collect server stats.
initStats(exporter)
return
}
d := time.Second * 10 * time.Duration(i)
log.Infof("sleeping %v to retry initializing Stackdriver exporter", d)
time.Sleep(d)
}
log.Warn("could not initialize Stackdriver exporter after retrying, giving up")
}
func initTracing() {
initJaegerTracing()
initStackdriverTracing()
}
func initProfiling(service, version string) {
// TODO(ahmetb) this method is duplicated in other microservices using Go
// since they are not sharing packages.
for i := 1; i <= 3; i++ {
if err := profiler.Start(profiler.Config{
Service: service,
ServiceVersion: version,
// ProjectID must be set if not running on GCP.
// ProjectID: "my-project",
}); err != nil {
log.Warnf("failed to start profiler: %+v", err)
} else {
log.Info("started Stackdriver profiler")
return
}
d := time.Second * 10 * time.Duration(i)
log.Infof("sleeping %v to retry initializing Stackdriver profiler", d)
time.Sleep(d)
}
log.Warn("could not initialize Stackdriver profiler after retrying, giving up")
}