add "server.http.listen-address" flag and "listenAddress" yaml config…

… entry ( redpanda-data/console#150 )

rest/config.go

@@ -11,6 +11,7 @@ import (
 type Config struct {
 	ServerGracefulShutdownTimeout time.Duration `yaml:"gracefulShutdownTimeout"`
 
+	HTTPListenAddress      string        `yaml:"listenAddress"`
 	HTTPListenPort         int           `yaml:"listenPort"`
 	HTTPServerReadTimeout  time.Duration `yaml:"readTimeout"`
 	HTTPServerWriteTimeout time.Duration `yaml:"writeTimeout"`
@@ -27,6 +28,7 @@ type Config struct {
 func (c *Config) RegisterFlags(f *flag.FlagSet) {
 	f.DurationVar(&c.ServerGracefulShutdownTimeout, "server.graceful-shutdown-timeout", 30*time.Second, "Timeout for graceful shutdowns")
 
+	f.StringVar(&c.HTTPListenAddress, "server.http.listen-address", "", "HTTP server listen address")
 	f.IntVar(&c.HTTPListenPort, "server.http.listen-port", 8080, "HTTP server listen port")
 	// Get "PORT" environment variable because CloudRun tells us what Port to use
 	portEnv := os.Getenv("PORT")

rest/server.go

@@ -65,7 +65,7 @@ func (s *Server) Start() error {
 	}()
 
 	// Serve HTTP server
-	listener, err := net.Listen("tcp", net.JoinHostPort("", strconv.Itoa(s.cfg.HTTPListenPort)))
+	listener, err := net.Listen("tcp", net.JoinHostPort(s.cfg.HTTPListenAddress, strconv.Itoa(s.cfg.HTTPListenPort)))
 	if err != nil {
 		return err
 	}