listen on socket

Signed-off-by: Diego Ciangottini <diego.ciangottini@pg.infn.it>

cmd/main.go

@@ -2,9 +2,13 @@ package main
 
 import (
 	"context"
+	"net"
 	"net/http"
 	"os"
+	"os/signal"
 	"strconv"
+	"strings"
+	"syscall"
 
 	"github.com/sirupsen/logrus"
 	"github.com/virtual-kubelet/virtual-kubelet/log"
@@ -61,9 +65,35 @@ func main() {
 	mutex.HandleFunc("/create", SidecarAPIs.CreateHandler)
 	mutex.HandleFunc("/delete", SidecarAPIs.DeleteHandler)
 	mutex.HandleFunc("/getLogs", SidecarAPIs.GetLogsHandler)
-	err = http.ListenAndServe(":"+interLinkConfig.Sidecarport, mutex)
 
-	if err != nil {
-		log.G(Ctx).Fatal(err)
+	if strings.HasPrefix(interLinkConfig.Socket, "unix://") {
+		// Create a Unix domain socket and listen for incoming connections.
+		socket, err := net.Listen("unix", strings.ReplaceAll(interLinkConfig.Socket, "unix://", ""))
+		if err != nil {
+			panic(err)
+		}
+
+		// Cleanup the sockfile.
+		c := make(chan os.Signal, 1)
+		signal.Notify(c, os.Interrupt, syscall.SIGTERM)
+		go func() {
+			<-c
+			os.Remove(strings.ReplaceAll(interLinkConfig.Socket, "unix://", ""))
+			os.Exit(1)
+		}()
+		server := http.Server{
+			Handler: mutex,
+		}
+
+		log.G(Ctx).Info(socket)
+
+		if err := server.Serve(socket); err != nil {
+			log.G(Ctx).Fatal(err)
+		}
+	} else {
+		err = http.ListenAndServe(":"+interLinkConfig.Sidecarport, mutex)
+		if err != nil {
+			log.G(Ctx).Fatal(err)
+		}
 	}
 }

pkg/common/types.go

@@ -48,6 +48,7 @@ type InterLinkConfig struct {
 	Scancelpath       string `yaml:"ScancelPath"`
 	Squeuepath        string `yaml:"SqueuePath"`
 	Interlinkport     string `yaml:"InterlinkPort"`
+	Socket            string `yaml:"Socket"`
 	Sidecarport       string `yaml:"SidecarPort"`
 	Commandprefix     string `yaml:"CommandPrefix"`
 	ExportPodData     bool   `yaml:"ExportPodData"`