Adding Msgpack render for Context, along with the tests.

context.go

@@ -421,6 +421,12 @@ func (c *Context) JSON(code int, obj interface{}) {
 	}
 }
 
+// Msgpack serializes the given struct as Msgpack into the response body.
+// It also sets the Content-Type as "application/msgpack"
+func (c *Context) Msgpack(code int, obj interface{}) {
+	c.Render(code, render.Msgpack{Data: obj})
+}
+
 // XML serializes the given struct as XML into the response body.
 // It also sets the Content-Type as "application/xml".
 func (c *Context) XML(code int, obj interface{}) {

context_test.go

@@ -444,6 +444,17 @@ func TestContextRenderYAML(t *testing.T) {
 	assert.Equal(t, w.HeaderMap.Get("Content-Type"), "application/x-yaml; charset=utf-8")
 }
 
+// TestContextRenderMsgpack tests that the response is serialized as Msgpack
+// and Content-Type is set to application/x-msgpack
+func TestContextRenderMsgpack(t *testing.T) {
+	c, w, _ := CreateTestContext()
+	c.Msgpack(201, H{"foo": "bar"})
+
+	assert.Equal(t, w.Code, 201)
+	assert.Equal(t, w.Body.Bytes(), []byte{129, 163, 102, 111, 111, 163, 98, 97, 114})
+	assert.Equal(t, w.HeaderMap.Get("Content-Type"), "application/x-msgpack; charset=utf-8")
+}
+
 func TestContextHeaders(t *testing.T) {
 	c, _, _ := CreateTestContext()
 	c.Header("Content-Type", "text/plain")

render/msgpack.go

@@ -0,0 +1,22 @@
+// Copyright 2016 Andida Syahendar.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package render
+
+import (
+	"gopkg.in/vmihailenco/msgpack.v2"
+	"net/http"
+)
+
+type Msgpack struct {
+	Data interface{}
+}
+
+var msgpackContentType = []string{"application/x-msgpack; charset=utf-8"}
+
+func (r Msgpack) Render(w http.ResponseWriter) error {
+	writeContentType(w, msgpackContentType)
+
+	return msgpack.NewEncoder(w).Encode(r.Data)
+}

render/render_test.go

@@ -82,6 +82,19 @@ func TestRenderXML(t *testing.T) {
 	assert.Equal(t, w.Header().Get("Content-Type"), "application/xml; charset=utf-8")
 }
 
+func TestRenderMsgpack(t *testing.T) {
+	w := httptest.NewRecorder()
+	data := map[string]interface{}{
+		"foo": "bar",
+	}
+
+	err := (Msgpack{data}).Render(w)
+
+	assert.NoError(t, err)
+	assert.Equal(t, w.Body.Bytes(), []byte{129, 163, 102, 111, 111, 163, 98, 97, 114})
+	assert.Equal(t, w.Header().Get("Content-Type"), "application/x-msgpack; charset=utf-8")
+}
+
 func TestRenderRedirect(t *testing.T) {
 	// TODO
 }