/
main.go
159 lines (126 loc) · 3.5 KB
/
main.go
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package main
import (
"io"
"os"
"os/signal"
"syscall"
"time"
"github.com/openzipkin/zipkin-go/reporter"
"github.com/bygui86/go-traces/http-client/commons"
"github.com/bygui86/go-traces/http-client/config"
"github.com/bygui86/go-traces/http-client/logging"
"github.com/bygui86/go-traces/http-client/monitoring"
"github.com/bygui86/go-traces/http-client/rest"
"github.com/bygui86/go-traces/http-client/tracing"
)
const (
zipkinHost = "localhost"
zipkinPort = 9411
)
var (
monitoringServer *monitoring.Server
jaegerCloser io.Closer
zipkinReporter reporter.Reporter
restServer *rest.Server
)
func main() {
initLogging()
logging.SugaredLog.Infof("Start %s", commons.ServiceName)
cfg := loadConfig()
if cfg.GetEnableMonitoring() {
monitoringServer = startMonitoringServer()
}
if cfg.GetEnableTracing() {
switch cfg.GetTracingTech() {
case config.TracingTechJaeger:
jaegerCloser = initJaegerTracer()
case config.TracingTechZipkin:
zipkinReporter = initZipkinTracer()
}
}
restServer = startRestServer()
logging.SugaredLog.Infof("%s up and running", commons.ServiceName)
startSysCallChannel()
shutdownAndWait(1)
}
func initLogging() {
err := logging.InitGlobalLogger()
if err != nil {
logging.SugaredLog.Errorf("Logging setup failed: %s", err.Error())
os.Exit(501)
}
}
func loadConfig() *config.Config {
logging.Log.Debug("Load configurations")
return config.LoadConfig()
}
func startMonitoringServer() *monitoring.Server {
logging.Log.Debug("Start monitoring")
server := monitoring.NewServer()
logging.Log.Debug("Monitoring server successfully created")
server.Start()
logging.Log.Debug("Monitoring successfully started")
return server
}
func initJaegerTracer() io.Closer {
logging.Log.Debug("Init Jaeger tracer")
closer, err := tracing.InitTracer()
if err != nil {
logging.SugaredLog.Errorf("Jaeger tracer setup failed: %s", err.Error())
os.Exit(501)
}
return closer
}
func initZipkinTracer() reporter.Reporter {
logging.Log.Debug("Init Zipkin tracer")
zReporter, err := tracing.InitTestingZipkin(commons.ServiceName, zipkinHost, zipkinPort)
if err != nil {
logging.SugaredLog.Errorf("Zipkin tracer setup failed: %s", err.Error())
os.Exit(501)
}
return zReporter
}
func startRestServer() *rest.Server {
logging.Log.Debug("Start REST server")
server, newErr := rest.New()
if newErr != nil {
logging.SugaredLog.Errorf("REST server creation failed: %s", newErr.Error())
os.Exit(501)
}
logging.Log.Debug("REST server successfully created")
startErr := server.Start()
if startErr != nil {
logging.SugaredLog.Errorf("REST server start failed: %s", startErr.Error())
os.Exit(502)
}
logging.Log.Debug("REST server successfully started")
rest.RegisterCustomMetrics()
return server
}
func startSysCallChannel() {
syscallCh := make(chan os.Signal)
signal.Notify(syscallCh, syscall.SIGTERM, syscall.SIGINT, os.Interrupt)
<-syscallCh
}
func shutdownAndWait(timeout int) {
logging.SugaredLog.Warnf("Termination signal received! Timeout %d", timeout)
if restServer != nil {
restServer.Shutdown(timeout)
}
if jaegerCloser != nil {
err := jaegerCloser.Close()
if err != nil {
logging.SugaredLog.Errorf("Jaeger tracer closure failed: %s", err.Error())
}
}
if zipkinReporter != nil {
err := zipkinReporter.Close()
if err != nil {
logging.SugaredLog.Errorf("Zipkin tracer closure failed: %s", err.Error())
}
}
if monitoringServer != nil {
monitoringServer.Shutdown(timeout)
}
time.Sleep(time.Duration(timeout+1) * time.Second)
}