refactor(json): Restore gin support for app engine

Create new folder to support multiple json package.
restore gin support for app engine (disable jsonite through tags)

use jsoniter

$ go build -tags=jsoniter .

use default json

$ go build .

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

binding/json.go

@@ -7,11 +7,10 @@ package binding
 import (
 	"net/http"
 
-	"github.com/json-iterator/go"
+	"github.com/gin-gonic/gin/json"
 )
 
 var (
-	json                   = jsoniter.ConfigCompatibleWithStandardLibrary
 	EnableDecoderUseNumber = false
 )
 

errors.go

@@ -9,11 +9,9 @@ import (
 	"fmt"
 	"reflect"
 
-	"github.com/json-iterator/go"
+	"github.com/gin-gonic/gin/json"
 )
 
-var json = jsoniter.ConfigCompatibleWithStandardLibrary
-
 type ErrorType uint64
 
 const (

errors_test.go

@@ -8,6 +8,7 @@ import (
 	"errors"
 	"testing"
 
+	"github.com/gin-gonic/gin/json"
 	"github.com/stretchr/testify/assert"
 )
 

json/json_base.go

@@ -0,0 +1,17 @@
+// Copyright 2017 Bo-Yi Wu.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+//+build !jsoniter
+
+package json
+
+import (
+	"encoding/json"
+)
+
+var (
+	Marshal       = json.Marshal
+	MarshalIndent = json.MarshalIndent
+	NewDecoder    = json.NewDecoder
+)

json/json_iter.go

@@ -0,0 +1,18 @@
+// Copyright 2017 Bo-Yi Wu.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+//+build jsoniter
+
+package json
+
+import (
+	"github.com/json-iterator/go"
+)
+
+var (
+	json          = jsoniter.ConfigCompatibleWithStandardLibrary
+	Marshal       = json.Marshal
+	MarshalIndent = json.MarshalIndent
+	NewDecoder    = json.NewDecoder
+)

render/json.go

@@ -8,11 +8,9 @@ import (
 	"bytes"
 	"net/http"
 
-	"github.com/json-iterator/go"
+	"github.com/gin-gonic/gin/json"
 )
 
-var json = jsoniter.ConfigCompatibleWithStandardLibrary
-
 type JSON struct {
 	Data interface{}
 }