Adds debug mode (part 1)

- Adds API to switch the gin's mode
- Log listening port
- Log routes

gin.go

@@ -1,6 +1,7 @@
 package gin
 
 import (
+	"fmt"
 	"github.com/gin-gonic/gin/render"
 	"github.com/julienschmidt/httprouter"
 	"html/template"
@@ -113,12 +114,18 @@ func (engine *Engine) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 }
 
 func (engine *Engine) Run(addr string) {
+	if gin_mode == debugCode {
+		fmt.Println("[GIN-debug] Listening and serving HTTP on " + addr)
+	}
 	if err := http.ListenAndServe(addr, engine); err != nil {
 		panic(err)
 	}
 }
 
 func (engine *Engine) RunTLS(addr string, cert string, key string) {
+	if gin_mode == debugCode {
+		fmt.Println("[GIN-debug] Listening and serving HTTPS on " + addr)
+	}
 	if err := http.ListenAndServeTLS(addr, cert, key, engine); err != nil {
 		panic(err)
 	}
@@ -168,6 +175,11 @@ func (group *RouterGroup) pathFor(p string) string {
 func (group *RouterGroup) Handle(method, p string, handlers []HandlerFunc) {
 	p = group.pathFor(p)
 	handlers = group.combineHandlers(handlers)
+	if gin_mode == debugCode {
+		nuHandlers := len(handlers)
+		name := funcName(handlers[nuHandlers-1])
+		fmt.Printf("[GIN-debug] %-5s %-25s --> %s (%d handlers)\n", method, p, name, nuHandlers)
+	}
 	group.engine.router.Handle(method, p, func(w http.ResponseWriter, req *http.Request, params httprouter.Params) {
 		c := group.engine.createContext(w, req, params, handlers)
 		c.Next()

mode.go

@@ -0,0 +1,38 @@
+package gin
+
+import (
+	"os"
+)
+
+const GIN_MODE = "GIN_MODE"
+
+const (
+	DebugMode   string = "debug"
+	ReleaseMode string = "release"
+)
+const (
+	debugCode   = iota
+	releaseCode = iota
+)
+
+var gin_mode int = debugCode
+
+func SetMode(value string) {
+	switch value {
+	case DebugMode:
+		gin_mode = debugCode
+	case ReleaseMode:
+		gin_mode = releaseCode
+	default:
+		panic("gin mode unknown, the allowed modes are: " + DebugMode + " and " + ReleaseMode)
+	}
+}
+
+func init() {
+	value := os.Getenv(GIN_MODE)
+	if len(value) == 0 {
+		SetMode(DebugMode)
+	} else {
+		SetMode(value)
+	}
+}

utils.go

@@ -2,6 +2,8 @@ package gin
 
 import (
 	"encoding/xml"
+	"reflect"
+	"runtime"
 )
 
 type H map[string]interface{}
@@ -38,3 +40,7 @@ func filterFlags(content string) string {
 	}
 	return content
 }
+
+func funcName(f interface{}) string {
+	return runtime.FuncForPC(reflect.ValueOf(f).Pointer()).Name()
+}