Merge branch 'release/0.4.0'

README.md

@@ -44,6 +44,12 @@ Hello world
 
 - Serve dynamic route with parameter:
 ```go
+package main
+
+import (
+	"github.com/takama/router"
+)
+
 func main() {
 	r := router.New()
 	r.GET("/hello/:name", func(c *router.Control) {
@@ -69,6 +75,12 @@ Hello John
 
 - Checks JSON Content-Type automatically:
 ```go
+package main
+
+import (
+	"github.com/takama/router"
+)
+
 // Data is helper to construct JSON
 type Data map[string]interface{}
 
@@ -109,6 +121,12 @@ Content-Length: 102
 
 - Use timer to calculate duration of request handling:
 ```go
+package main
+
+import (
+	"github.com/takama/router"
+)
+
 // Data is helper to construct JSON
 type Data map[string]interface{}
 
@@ -157,6 +175,12 @@ Content-Length: 143
 
 - Custom handler with "Access-Control-Allow" options and compact JSON:
 ```go
+package main
+
+import (
+	"github.com/takama/router"
+)
+
 // Data is helper to construct JSON
 type Data map[string]interface{}
 
@@ -203,6 +227,59 @@ Content-Length: 28
 {"debug":true,"error":false}
 ```
 
+- Use google json style `https://google.github.io/styleguide/jsoncstyleguide.xml`:
+```go
+package main
+
+import (
+	"net/http"
+
+	"github.com/takama/router"
+)
+
+func main() {
+	r := router.New()
+	r.GET("/api/v1/people/:action/:id", func(c *router.Control) {
+
+		// Do something
+
+		c.Method("people." + c.Get(":action"))
+		c.SetParams(map[string]string{"userId": c.Get(":id")})
+		c.SetError(http.StatusNotFound, "UserId not found")
+		c.AddError(router.Error{Message: "Group or User not found"})
+		c.Code(http.StatusNotFound).Body(nil)
+	})
+	// Listen and serve on 0.0.0.0:8888
+	r.Listen(":8888")
+}
+```
+
+- Check it:
+```sh
+curl -i http://localhost:8888/api/v1/people/get/@me
+
+HTTP/1.1 404 Not Found
+Content-Type: application/json
+Date: Sat, 22 Oct 2016 14:50:00 GMT
+Content-Length: 220
+
+{
+  "method": "people.get",
+  "params": {
+    "userId": "@me"
+  },
+  "error": {
+    "code": 404,
+    "message": "UserId not found",
+    "errors": [
+      {
+        "message": "Group or User not found"
+      }
+    ]
+  }
+}
+```
+
 ## Author
 
 [Igor Dolzhikov](https://github.com/takama)

control.go

@@ -36,44 +36,78 @@ type Control struct {
 	// Code of HTTP status
 	code int
 
-	// CompactJSON propery defines JSON output format (default is not compact)
+	// compactJSON propery defines JSON output format (default is not compact)
 	compactJSON bool
 
-	// Params is set of parameters
-	Params []Param
+	// if used, json header shows meta data
+	useMetaData bool
+
+	// header with metadata
+	header Header
+
+	// errors
+	errorHeader ErrorHeader
+
+	// params is set of key/value parameters
+	params []Param
 
 	// timer used to calculate a elapsed time for handler and writing it in a response
 	timer time.Time
 }
 
 // Param is a URL parameter which represents as key and value.
 type Param struct {
-	Key   string
-	Value string
+	Key   string `json:"key,omitempty"`
+	Value string `json:"value,omitempty"`
 }
 
-// Header is used to prepare a JSON header with duration triggered by UserTimer() method
+// Header is used to prepare a JSON header with meta data
 type Header struct {
-	Duration time.Duration `json:"duration"`
-	Took     string        `json:"took"`
-	Data     interface{}   `json:"data"`
+	Duration   time.Duration `json:"duration,omitempty"`
+	Took       string        `json:"took,omitempty"`
+	APIVersion string        `json:"apiVersion,omitempty"`
+	Context    string        `json:"context,omitempty"`
+	ID         string        `json:"id,omitempty"`
+	Method     string        `json:"method,omitempty"`
+	Params     interface{}   `json:"params,omitempty"`
+	Data       interface{}   `json:"data,omitempty"`
+	Error      interface{}   `json:"error,omitempty"`
+}
+
+// ErrorHeader contains error code, message and array of specified error reports
+type ErrorHeader struct {
+	Code    uint16  `json:"code,omitempty"`
+	Message string  `json:"message,omitempty"`
+	Errors  []Error `json:"errors,omitempty"`
+}
+
+// Error report format
+type Error struct {
+	Domain       string `json:"domain,omitempty"`
+	Reason       string `json:"reason,omitempty"`
+	Message      string `json:"message,omitempty"`
+	Location     string `json:"location,omitempty"`
+	LocationType string `json:"locationType,omitempty"`
+	ExtendedHelp string `json:"extendedHelp,omitempty"`
+	SendReport   string `json:"sendReport,omitempty"`
 }
 
 // Get returns the first value associated with the given name.
 // If there are no values associated with the key, an empty string is returned.
 func (c *Control) Get(name string) string {
-	for idx := range c.Params {
-		if c.Params[idx].Key == name {
-			return c.Params[idx].Value
+	for idx := range c.params {
+		if c.params[idx].Key == name {
+			return c.params[idx].Value
 		}
 	}
 
 	return c.Request.URL.Query().Get(name)
 }
 
 // Set adds new parameters which represents as set of key/value.
-func (c *Control) Set(params []Param) {
-	c.Params = append(c.Params, params...)
+func (c *Control) Set(params ...Param) *Control {
+	c.params = append(c.params, params...)
+	return c
 }
 
 // Code assigns http status code, which returns on http request
@@ -85,12 +119,68 @@ func (c *Control) Code(code int) *Control {
 }
 
 // CompactJSON change JSON output format (default mode is false)
-func (c *Control) CompactJSON(mode bool) {
+func (c *Control) CompactJSON(mode bool) *Control {
 	c.compactJSON = mode
+	return c
+}
+
+// UseMetaData shows meta data in JSON Header
+func (c *Control) UseMetaData() *Control {
+	c.useMetaData = true
+	return c
+}
+
+// APIVersion add API version meta data
+func (c *Control) APIVersion(version string) *Control {
+	c.useMetaData = true
+	c.header.APIVersion = version
+	return c
+}
+
+// Context add context meta data
+func (c *Control) Context(context string) *Control {
+	c.useMetaData = true
+	c.header.Context = context
+	return c
+}
+
+// ID add id meta data
+func (c *Control) ID(id string) *Control {
+	c.useMetaData = true
+	c.header.ID = id
+	return c
+}
+
+// Method add method meta data
+func (c *Control) Method(method string) *Control {
+	c.useMetaData = true
+	c.header.Method = method
+	return c
+}
+
+// SetParams add params meta data in alternative format
+func (c *Control) SetParams(params interface{}) *Control {
+	c.useMetaData = true
+	c.header.Params = params
+	return c
+}
+
+func (c *Control) SetError(code uint16, message string) *Control {
+	c.useMetaData = true
+	c.errorHeader.Code = code
+	c.errorHeader.Message = message
+	return c
+}
+
+func (c *Control) AddError(errors ...Error) *Control {
+	c.useMetaData = true
+	c.errorHeader.Errors = append(c.errorHeader.Errors, errors...)
+	return c
 }
 
 // UseTimer allow caalculate elapsed time of request handling
 func (c *Control) UseTimer() {
+	c.useMetaData = true
 	c.timer = time.Now()
 }
 
@@ -106,9 +196,20 @@ func (c *Control) Body(data interface{}) {
 			c.Writer.Header().Add("Content-type", MIMETEXT)
 		}
 	} else {
-		if !c.timer.IsZero() {
-			took := time.Now()
-			data = &Header{Duration: took.Sub(c.timer), Took: took.Sub(c.timer).String(), Data: data}
+		if c.useMetaData {
+			c.header.Data = data
+			if !c.timer.IsZero() {
+				took := time.Now()
+				c.header.Duration = took.Sub(c.timer)
+				c.header.Took = took.Sub(c.timer).String()
+			}
+			if c.header.Params == nil && len(c.params) > 0 {
+				c.header.Params = c.params
+			}
+			if c.errorHeader.Code != 0 || c.errorHeader.Message != "" || len(c.errorHeader.Errors) > 0 {
+				c.header.Error = c.errorHeader
+			}
+			data = c.header
 		}
 		var err error
 		if c.compactJSON {