Changed signature for response before func

Signed-off-by: Vishal Rana <vr@labstack.com>

echo.go

@@ -293,16 +293,14 @@ func New() (e *Echo) {
 
 // NewContext returns a Context instance.
 func (e *Echo) NewContext(r *http.Request, w http.ResponseWriter) Context {
-	c := &context{
+	return &context{
 		request:  r,
-		response: &Response{Writer: w},
+		response: &Response{echo: e, Writer: w},
 		store:    make(Map),
 		echo:     e,
 		pvalues:  make([]string, *e.maxParam),
 		handler:  NotFoundHandler,
 	}
-	c.response.context = c
-	return c
 }
 
 // Router returns router.

response.go

@@ -11,17 +11,13 @@ type (
 	// by an HTTP handler to construct an HTTP response.
 	// See: https://golang.org/pkg/net/http/#ResponseWriter
 	Response struct {
-		context     Context
-		beforeFuncs []BeforeResponseFunc
+		echo        *Echo
+		beforeFuncs []func()
 		Writer      http.ResponseWriter
 		Status      int
 		Size        int64
 		Committed   bool
 	}
-
-	// BeforeResponseFunc defines a function which is called just before writing the
-	// response.
-	BeforeResponseFunc func(Context)
 )
 
 // Header returns the header map for the writer that will be sent by
@@ -35,7 +31,7 @@ func (r *Response) Header() http.Header {
 }
 
 // Before registers a function which is called just before the response is written.
-func (r *Response) Before(fn BeforeResponseFunc) {
+func (r *Response) Before(fn func()) {
 	r.beforeFuncs = append(r.beforeFuncs, fn)
 }
 
@@ -45,11 +41,11 @@ func (r *Response) Before(fn BeforeResponseFunc) {
 // used to send error codes.
 func (r *Response) WriteHeader(code int) {
 	if r.Committed {
-		r.context.Logger().Warn("response already committed")
+		r.echo.Logger.Warn("response already committed")
 		return
 	}
 	for _, fn := range r.beforeFuncs {
-		fn(r.context)
+		fn()
 	}
 	r.Status = code
 	r.Writer.WriteHeader(code)

response_test.go

@@ -12,10 +12,10 @@ func TestResponse(t *testing.T) {
 	req := httptest.NewRequest(GET, "/", nil)
 	rec := httptest.NewRecorder()
 	c := e.NewContext(req, rec)
-	res := &Response{context: c, Writer: rec}
+	res := &Response{echo: e, Writer: rec}
 
 	// Before
-	res.Before(func(c Context) {
+	res.Before(func() {
 		c.Response().Header().Set(HeaderServer, "echo")
 	})
 	res.Write([]byte("test"))