feat(fxcore): Added support for listener address (#206)

Author: ekkinox

docs/modules/fxcore.md

@@ -46,7 +46,7 @@ When you use a Yokai `application template`, you have nothing to install, it's r
 modules:
   core:
     server:
-      port: 8081                       # core http server port (default 8081)
+      address: ":8081"                 # core http server listener address (default :8081)
       errors:              
         obfuscate: false               # to obfuscate error messages on the core http server responses
         stack: false                   # to add error stack trace to error response of the core http server

fxcore/README.md

@@ -82,7 +82,7 @@ modules:
       type: stdout
   core:
     server:
-      port: 8081                       # core http server port (default 8081)
+      address: ":8081"                 # core http server listener address (default :8081)
       errors:              
         obfuscate: false               # to obfuscate error messages on the core http server responses
         stack: false                   # to add error stack trace to error response of the core http server

fxcore/module.go

@@ -32,7 +32,7 @@ import (
 
 const (
 	ModuleName                      = "core"
-	DefaultPort                     = 8081
+	DefaultAddress                  = ":8081"
 	DefaultMetricsPath              = "/metrics"
 	DefaultHealthCheckStartupPath   = "/healthz"
 	DefaultHealthCheckLivenessPath  = "/livez"
@@ -135,13 +135,13 @@ func NewFxCore(p FxCoreParam) (*Core, error) {
 	// lifecycles
 	p.LifeCycle.Append(fx.Hook{
 		OnStart: func(ctx context.Context) error {
-			port := p.Config.GetInt("modules.core.server.port")
-			if port == 0 {
-				port = DefaultPort
+			address := p.Config.GetString("modules.core.server.address")
+			if address == "" {
+				address = DefaultAddress
 			}
 
 			//nolint:errcheck
-			go coreServer.Start(fmt.Sprintf(":%d", port))
+			go coreServer.Start(address)
 
 			return nil
 		},