Fixed nested group middleware

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

echo.go

@@ -391,9 +391,13 @@ func (e *Echo) add(method, path string, handler Handler, middleware ...Middlewar
 	name := handlerName(handler)
 	e.router.Add(method, path, HandlerFunc(func(c Context) error {
 		h := handler
-		for _, m := range middleware {
-			h = m.Handle(h)
+		// Chain middleware
+		for i := len(middleware) - 1; i >= 0; i-- {
+			h = middleware[i].Handle(h)
 		}
+		// for _, m := range middleware {
+		// 	h = m.Handle(h)
+		// }
 		return h.Handle(c)
 	}), e)
 	r := Route{
@@ -404,7 +408,7 @@ func (e *Echo) add(method, path string, handler Handler, middleware ...Middlewar
 	e.router.routes = append(e.router.routes, r)
 }
 
-// Group creates a new sub-router with prefix.
+// Group creates a new router group with prefix.
 func (e *Echo) Group(prefix string, m ...Middleware) (g *Group) {
 	g = &Group{prefix: prefix, echo: e}
 	g.Use(m...)

echo_test.go

@@ -255,17 +255,24 @@ func TestEchoGroup(t *testing.T) {
 
 	// Group
 	g1 := e.Group("/group1")
-	g1.Use(MiddlewareFunc(func(h Handler) Handler {
-		return HandlerFunc(func(c Context) error {
+	g1.Use(WrapMiddleware(HandlerFunc(func(c Context) error {
 		buf.WriteString("1")
 		return h.Handle(c)
-		})
-	}))
+
+	})))
 	g1.Get("", h)
 
-	// Nested groups
+	// Nested groups with middleware
 	g2 := e.Group("/group2")
+	g2.Use(WrapMiddleware(HandlerFunc(func(c Context) error {
+		buf.WriteString("2")
+		return nil
+	})))
 	g3 := g2.Group("/group3")
+	g3.Use(WrapMiddleware(HandlerFunc(func(c Context) error {
+		buf.WriteString("3")
+		return nil
+	})))
 	g3.Get("", h)
 
 	request(GET, "/users", e)
@@ -276,8 +283,8 @@ func TestEchoGroup(t *testing.T) {
 	assert.Equal(t, "01", buf.String())
 
 	buf.Reset()
-	c, _ := request(GET, "/group2/group3", e)
-	assert.Equal(t, http.StatusOK, c)
+	request(GET, "/group2/group3", e)
+	assert.Equal(t, "023", buf.String())
 }
 
 func TestEchoNotFound(t *testing.T) {

engine/engine.go

@@ -18,20 +18,39 @@ type (
 
 	// Request defines the interface for HTTP request.
 	Request interface {
-		// TLS returns true if connection is TLS otherwise false.
+		// TLS returns true if HTTP connection is TLS otherwise false.
 		TLS() bool
 
+		// Scheme returns the HTTP protocol scheme, `http` or `https`.
 		Scheme() string
+
+		// Host returns HTTP request host. // For server requests Host specifies the host on which the
+		// URL is sought. Per RFC 2616, this is either the value of
+		// the "Host" header or the host name given in the URL itself.
 		Host() string
+
+		// URI returns the unmodified `Request-URI` sent by the client.
 		URI() string
+
+		// URL returns `engine.URL`.
 		URL() URL
+
+		// Header returns `engine.Header`.
 		Header() Header
+
 		// Proto() string
 		// ProtoMajor() int
 		// ProtoMinor() int
+
+		// UserAgent returns the client's `User-Agent`.
 		UserAgent() string
+
+		// RemoteAddress returns the client's network address.
 		RemoteAddress() string
+
+		// Method returns the HTTP method of the request.
 		Method() string
+
 		SetMethod(string)
 		Body() io.ReadCloser
 		FormValue(string) string

group.go

@@ -60,7 +60,9 @@ func (g *Group) Match(methods []string, path string, handler Handler, middleware
 	}
 }
 
+// Group creates a new sub-group with prefix.
 func (g *Group) Group(prefix string, m ...Middleware) *Group {
+	m = append(g.middleware, m...)
 	return g.echo.Group(g.prefix+prefix, m...)
 }
 
@@ -71,8 +73,9 @@ func (g *Group) add(method, path string, handler Handler, middleware ...Middlewa
 
 	g.echo.router.Add(method, path, HandlerFunc(func(c Context) error {
 		h := handler
-		for _, m := range middleware {
-			h = m.Handle(h)
+		// Chain middleware
+		for i := len(middleware) - 1; i >= 0; i-- {
+			h = middleware[i].Handle(h)
 		}
 		return h.Handle(c)
 	}), g.echo)