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server.go
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server.go
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package common
import (
"fmt"
"net"
"net/http"
"os"
"os/signal"
"sync"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/sirupsen/logrus"
"google.golang.org/grpc"
)
func createListener(prefix string) (net.Listener, error) {
port := os.Getenv(fmt.Sprintf("%s_PORT", prefix))
unixSocket := os.Getenv(fmt.Sprintf("%s_UNIXSOCKET", prefix))
if unixSocket != "" {
return net.Listen("unix", unixSocket)
} else if port != "" {
return net.Listen("tcp", fmt.Sprintf("127.0.0.1:%s", port))
}
return nil, fmt.Errorf("Neither %s_PORT or %s_UNIXSOCKET is specified", prefix, prefix)
}
func Init(registerGrpc func(*grpc.Server) error) error {
if os.Getenv("DEBUG") != "" {
logrus.SetLevel(logrus.DebugLevel)
logrus.SetReportCaller(true)
}
var wg sync.WaitGroup
var grpcServer *grpc.Server
if registerGrpc != nil {
grpcListener, err := createListener("GRPC")
if err != nil {
return err
}
logrus.Infof("Listening on %s for grpc\n", grpcListener.Addr())
grpcServer = grpc.NewServer(
grpc.MaxRecvMsgSize(1024*1024*32),
grpc.WriteBufferSize(0),
grpc.ReadBufferSize(0),
)
err = registerGrpc(grpcServer)
if err != nil {
return err
}
wg.Add(1)
go func(wg *sync.WaitGroup) {
logrus.Info("Starting grpc listener")
err := grpcServer.Serve(grpcListener)
if err != nil {
logrus.Error(err)
}
wg.Done()
}(&wg)
}
wg.Add(1)
httpListener, err := createListener("HTTP")
if err != nil {
return err
}
httpServer := http.Server{}
http.Handle("/metrics", promhttp.Handler())
go func(wg *sync.WaitGroup) {
logrus.Info("Starting prometheus listener")
err := httpServer.Serve(httpListener)
if err != nil {
logrus.Error(err)
}
wg.Done()
}(&wg)
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
go func(grpcServer *grpc.Server, httpServer *http.Server, ch <-chan os.Signal) {
<-c
if grpcServer != nil {
grpcServer.Stop()
}
httpServer.Close()
os.Exit(0)
}(grpcServer, &httpServer, c)
wg.Wait()
return nil
}