Add support for listening on unix socket

imaginary.go

@@ -18,6 +18,7 @@ import (
 
 var (
 	aAddr               = flag.String("a", "", "Bind address")
+	aUnixSocket         = flag.String("unix-socket", "", "Path to the unix socket to listen on. If specified - address and port flags are ignored")
 	aPort               = flag.Int("p", 8088, "Port to listen")
 	aVers               = flag.Bool("v", false, "Show version")
 	aVersl              = flag.Bool("version", false, "Show version")
@@ -58,6 +59,7 @@ const usage = `imaginary %s
 
 Usage:
   imaginary -p 80
+  imaginary -unix-socket /var/run/imaginary.sock
   imaginary -cors
   imaginary -concurrency 10
   imaginary -path-prefix /api/v1
@@ -76,6 +78,7 @@ Usage:
 Options:
 
   -a <addr>                  Bind address [default: *]
+  -unix-socket               Path to the unix socket to listen on. If specified - address and port flags are ignored
   -p <port>                  Bind port [default: 8088]
   -h, -help                  Show help
   -v, -version               Show version
@@ -138,6 +141,7 @@ func main() {
 	opts := ServerOptions{
 		Port:               port,
 		Address:            *aAddr,
+		UnixSocket:         *aUnixSocket,
 		CORS:               *aCors,
 		AuthForwarding:     *aAuthForwarding,
 		EnableURLSource:    *aEnableURLSource,

server.go

@@ -3,6 +3,7 @@ package main
 import (
 	"context"
 	"log"
+	"net"
 	"net/http"
 	"net/url"
 	"os"
@@ -17,6 +18,7 @@ import (
 type ServerOptions struct {
 	Port               int
 	Burst              int
+	UnixSocket         string
 	Concurrency        int
 	HTTPCacheTTL       int
 	HTTPReadTimeout    int
@@ -98,6 +100,13 @@ func Server(o ServerOptions) {
 }
 
 func listenAndServe(s *http.Server, o ServerOptions) error {
+	if o.UnixSocket != "" {
+		listener, err := net.Listen("unix", o.UnixSocket)
+		if err != nil {
+			return err
+		}
+		return s.Serve(listener)
+	}
 	if o.CertFile != "" && o.KeyFile != "" {
 		return s.ListenAndServeTLS(o.CertFile, o.KeyFile)
 	}