add advertising option

cmd/cmd.go

@@ -55,6 +55,11 @@ var (
 			Value:  ":0",
 			Usage:  "Bind address for the server. 127.0.0.1:8080",
 		},
+		cli.StringFlag{
+			Name:   "server_advertise",
+			EnvVar: "MICRO_SERVER_ADVERTISE",
+			Usage:  "Used instead of the server_address when registering with discovery. 127.0.0.1:8080",
+		},
 		cli.StringSliceFlag{
 			Name:   "server_metadata",
 			EnvVar: "MICRO_SERVER_METADATA",
@@ -186,6 +191,7 @@ func Setup(c *cli.Context) error {
 		server.Version(c.String("server_version")),
 		server.Id(c.String("server_id")),
 		server.Address(c.String("server_address")),
+		server.Advertise(c.String("server_advertise")),
 		server.Metadata(metadata),
 	)
 

server/options.go

@@ -13,6 +13,7 @@ type options struct {
 	metadata  map[string]string
 	name      string
 	address   string
+	advertise string
 	id        string
 	version   string
 }
@@ -71,6 +72,10 @@ func (o options) Address() string {
 	return o.address
 }
 
+func (o options) Advertise() string {
+	return o.advertise
+}
+
 func (o options) Metadata() map[string]string {
 	return o.metadata
 }
@@ -99,6 +104,12 @@ func Address(a string) Option {
 	}
 }
 
+func Advertise(a string) Option {
+	return func(o *options) {
+		o.advertise = a
+	}
+}
+
 func Broker(b broker.Broker) Option {
 	return func(o *options) {
 		o.broker = b

server/rpc_server.go

@@ -114,10 +114,19 @@ func (s *rpcServer) Subscribe(sb Subscriber) error {
 func (s *rpcServer) Register() error {
 	// parse address for host, port
 	config := s.Config()
-	var host string
+	var advt, host string
 	var port int
 
-	parts := strings.Split(config.Address(), ":")
+	// check the advertise address first
+	// if it exists then use it, otherwise
+	// use the address
+	if len(config.Advertise()) > 0 {
+		advt = config.Advertise()
+	} else {
+		advt = config.Address()
+	}
+
+	parts := strings.Split(advt, ":")
 	if len(parts) > 1 {
 		host = strings.Join(parts[:len(parts)-1], ":")
 		port, _ = strconv.Atoi(parts[len(parts)-1])
@@ -177,9 +186,19 @@ func (s *rpcServer) Register() error {
 
 func (s *rpcServer) Deregister() error {
 	config := s.Config()
-	var host string
+	var advt, host string
 	var port int
-	parts := strings.Split(config.Address(), ":")
+
+	// check the advertise address first
+	// if it exists then use it, otherwise
+	// use the address
+	if len(config.Advertise()) > 0 {
+		advt = config.Advertise()
+	} else {
+		advt = config.Address()
+	}
+
+	parts := strings.Split(advt, ":")
 	if len(parts) > 1 {
 		host = strings.Join(parts[:len(parts)-1], ":")
 		port, _ = strconv.Atoi(parts[len(parts)-1])