New errors API!!

context.go

@@ -126,6 +126,11 @@ func (c *Context) AbortWithStatus(code int) {
 	c.Abort()
 }
 
+func (c *Context) AbortWithError(code int, err error) *errorMsg {
+	c.AbortWithStatus(code)
+	return c.Error(err)
+}
+
 func (c *Context) IsAborted() bool {
 	return c.index == AbortIndex
 }
@@ -134,30 +139,16 @@ func (c *Context) IsAborted() bool {
 /********* ERROR MANAGEMENT *********/
 /************************************/
 
-// Fail is the same as Abort plus an error message.
-// Calling `context.Fail(500, err)` is equivalent to:
-// ```
-// context.Error("Operation aborted", err)
-// context.AbortWithStatus(500)
-// ```
-func (c *Context) Fail(code int, err error) {
-	c.Error(err, "Operation aborted")
-	c.AbortWithStatus(code)
-}
-
-func (c *Context) ErrorTyped(err error, typ int, meta interface{}) {
-	c.Errors = append(c.Errors, errorMsg{
-		Error: err,
-		Flags: typ,
-		Meta:  meta,
-	})
-}
-
 // Attaches an error to the current context. The error is pushed to a list of errors.
 // It's a good idea to call Error for each error that occurred during the resolution of a request.
 // A middleware can be used to collect all the errors and push them to a database together, print a log, or append it in the HTTP response.
-func (c *Context) Error(err error, meta interface{}) {
-	c.ErrorTyped(err, ErrorTypeExternal, meta)
+func (c *Context) Error(err error) *errorMsg {
+	newError := &errorMsg{
+		Error: err,
+		Flags: ErrorTypePrivate,
+	}
+	c.Errors = append(c.Errors, newError)
+	return newError
 }
 
 func (c *Context) LastError() error {
@@ -168,6 +159,35 @@ func (c *Context) LastError() error {
 	return nil
 }
 
+/************************************/
+/******** METADATA MANAGEMENT********/
+/************************************/
+
+// Sets a new pair key/value just for the specified context.
+// It also lazy initializes the hashmap.
+func (c *Context) Set(key string, value interface{}) {
+	if c.Keys == nil {
+		c.Keys = make(map[string]interface{})
+	}
+	c.Keys[key] = value
+}
+
+// Get returns the value for the given key or an error if the key does not exist.
+func (c *Context) Get(key string) (value interface{}, exists bool) {
+	if c.Keys != nil {
+		value, exists = c.Keys[key]
+	}
+	return
+}
+
+// MustGet returns the value for the given key or panics if the value doesn't exist.
+func (c *Context) MustGet(key string) interface{} {
+	if value, exists := c.Get(key); exists {
+		return value
+	}
+	panic("Key \"" + key + "\" does not exist")
+}
+
 /************************************/
 /************ INPUT DATA ************/
 /************************************/
@@ -233,40 +253,29 @@ func (c *Context) postFormValue(key string) (string, bool) {
 	return "", false
 }
 
-/************************************/
-/******** METADATA MANAGEMENT********/
-/************************************/
-
-// Sets a new pair key/value just for the specified context.
-// It also lazy initializes the hashmap.
-func (c *Context) Set(key string, value interface{}) {
-	if c.Keys == nil {
-		c.Keys = make(map[string]interface{})
-	}
-	c.Keys[key] = value
+// This function checks the Content-Type to select a binding engine automatically,
+// Depending the "Content-Type" header different bindings are used:
+// "application/json" --> JSON binding
+// "application/xml"  --> XML binding
+// else --> returns an error
+// if Parses the request's body as JSON if Content-Type == "application/json"  using JSON or XML  as a JSON input. It decodes the json payload into the struct specified as a pointer.Like ParseBody() but this method also writes a 400 error if the json is not valid.
+func (c *Context) Bind(obj interface{}) error {
+	b := binding.Default(c.Request.Method, c.ContentType())
+	return c.BindWith(obj, b)
 }
 
-// Get returns the value for the given key or an error if the key does not exist.
-func (c *Context) Get(key string) (value interface{}, exists bool) {
-	if c.Keys != nil {
-		value, exists = c.Keys[key]
-	}
-	return
+func (c *Context) BindJSON(obj interface{}) error {
+	return c.BindWith(obj, binding.JSON)
 }
 
-// MustGet returns the value for the given key or panics if the value doesn't exist.
-func (c *Context) MustGet(key string) interface{} {
-	if value, exists := c.Get(key); exists {
-		return value
-	} else {
-		panic("Key \"" + key + "\" does not exist")
+func (c *Context) BindWith(obj interface{}, b binding.Binding) error {
+	if err := b.Bind(c.Request, obj); err != nil {
+		c.AbortWithError(400, err).Type(ErrorTypeBind)
+		return err
 	}
+	return nil
 }
 
-/************************************/
-/********* PARSING REQUEST **********/
-/************************************/
-
 func (c *Context) ClientIP() string {
 	clientIP := c.Request.Header.Get("X-Real-IP")
 	if len(clientIP) > 0 {
@@ -284,25 +293,6 @@ func (c *Context) ContentType() string {
 	return filterFlags(c.Request.Header.Get("Content-Type"))
 }
 
-// This function checks the Content-Type to select a binding engine automatically,
-// Depending the "Content-Type" header different bindings are used:
-// "application/json" --> JSON binding
-// "application/xml"  --> XML binding
-// else --> returns an error
-// if Parses the request's body as JSON if Content-Type == "application/json"  using JSON or XML  as a JSON input. It decodes the json payload into the struct specified as a pointer.Like ParseBody() but this method also writes a 400 error if the json is not valid.
-func (c *Context) Bind(obj interface{}) bool {
-	b := binding.Default(c.Request.Method, c.ContentType())
-	return c.BindWith(obj, b)
-}
-
-func (c *Context) BindWith(obj interface{}, b binding.Binding) bool {
-	if err := b.Bind(c.Request, obj); err != nil {
-		c.Fail(400, err)
-		return false
-	}
-	return true
-}
-
 /************************************/
 /******** RESPONSE RENDERING ********/
 /************************************/
@@ -319,8 +309,7 @@ func (c *Context) Render(code int, r render.Render) {
 	c.Writer.WriteHeader(code)
 	if err := r.Write(c.Writer); err != nil {
 		debugPrintError(err)
-		c.ErrorTyped(err, ErrorTypeInternal, nil)
-		c.AbortWithStatus(500)
+		c.AbortWithError(500, err).Type(ErrorTypeRender)
 	}
 }
 
@@ -430,7 +419,7 @@ func (c *Context) Negotiate(code int, config Negotiate) {
 		c.XML(code, data)
 
 	default:
-		c.Fail(http.StatusNotAcceptable, errors.New("the accepted formats are not offered by the server"))
+		c.AbortWithError(http.StatusNotAcceptable, errors.New("the accepted formats are not offered by the server"))
 	}
 }
 
@@ -458,6 +447,10 @@ func (c *Context) SetAccepted(formats ...string) {
 	c.Accepted = formats
 }
 
+/************************************/
+/******** CONTENT NEGOTIATION *******/
+/************************************/
+
 func (c *Context) Deadline() (deadline time.Time, ok bool) {
 	return
 }

context_test.go

@@ -41,7 +41,7 @@ func TestContextReset(t *testing.T) {
 	c.index = 2
 	c.Writer = &responseWriter{ResponseWriter: httptest.NewRecorder()}
 	c.Params = Params{Param{}}
-	c.Error(errors.New("test"), nil)
+	c.Error(errors.New("test"))
 	c.Set("foo", "bar")
 	c.reset()
 
@@ -352,49 +352,49 @@ func TestContextError(t *testing.T) {
 	assert.Nil(t, c.LastError())
 	assert.Empty(t, c.Errors.String())
 
-	c.Error(errors.New("first error"), "some data")
+	c.Error(errors.New("first error")).Meta("some data")
 	assert.Equal(t, c.LastError().Error(), "first error")
 	assert.Len(t, c.Errors, 1)
 	assert.Equal(t, c.Errors.String(), "Error #01: first error\n     Meta: some data\n")
 
-	c.Error(errors.New("second error"), "some data 2")
+	c.Error(errors.New("second error")).Meta("some data 2")
 	assert.Equal(t, c.LastError().Error(), "second error")
 	assert.Len(t, c.Errors, 2)
 	assert.Equal(t, c.Errors.String(), "Error #01: first error\n     Meta: some data\n"+
 		"Error #02: second error\n     Meta: some data 2\n")
 
 	assert.Equal(t, c.Errors[0].Error, errors.New("first error"))
-	assert.Equal(t, c.Errors[0].Meta, "some data")
-	assert.Equal(t, c.Errors[0].Flags, ErrorTypeExternal)
+	assert.Equal(t, c.Errors[0].Metadata, "some data")
+	assert.Equal(t, c.Errors[0].Flags, ErrorTypePrivate)
 
 	assert.Equal(t, c.Errors[1].Error, errors.New("second error"))
-	assert.Equal(t, c.Errors[1].Meta, "some data 2")
-	assert.Equal(t, c.Errors[1].Flags, ErrorTypeExternal)
+	assert.Equal(t, c.Errors[1].Metadata, "some data 2")
+	assert.Equal(t, c.Errors[1].Flags, ErrorTypePrivate)
 }
 
 func TestContextTypedError(t *testing.T) {
 	c, _, _ := createTestContext()
-	c.ErrorTyped(errors.New("externo 0"), ErrorTypeExternal, nil)
-	c.ErrorTyped(errors.New("externo 1"), ErrorTypeExternal, nil)
-	c.ErrorTyped(errors.New("interno 0"), ErrorTypeInternal, nil)
-	c.ErrorTyped(errors.New("externo 2"), ErrorTypeExternal, nil)
-	c.ErrorTyped(errors.New("interno 1"), ErrorTypeInternal, nil)
-	c.ErrorTyped(errors.New("interno 2"), ErrorTypeInternal, nil)
-
-	for _, err := range c.Errors.ByType(ErrorTypeExternal) {
-		assert.Equal(t, err.Flags, ErrorTypeExternal)
+	c.Error(errors.New("externo 0")).Type(ErrorTypePublic)
+	c.Error(errors.New("externo 1")).Type(ErrorTypePublic)
+	c.Error(errors.New("interno 0")).Type(ErrorTypePrivate)
+	c.Error(errors.New("externo 2")).Type(ErrorTypePublic)
+	c.Error(errors.New("interno 1")).Type(ErrorTypePrivate)
+	c.Error(errors.New("interno 2")).Type(ErrorTypePrivate)
+
+	for _, err := range c.Errors.ByType(ErrorTypePublic) {
+		assert.Equal(t, err.Flags, ErrorTypePublic)
 	}
 
-	for _, err := range c.Errors.ByType(ErrorTypeInternal) {
-		assert.Equal(t, err.Flags, ErrorTypeInternal)
+	for _, err := range c.Errors.ByType(ErrorTypePrivate) {
+		assert.Equal(t, err.Flags, ErrorTypePrivate)
 	}
 
 	assert.Equal(t, c.Errors.Errors(), []string{"externo 0", "externo 1", "interno 0", "externo 2", "interno 1", "interno 2"})
 }
 
 func TestContextFail(t *testing.T) {
 	c, w, _ := createTestContext()
-	c.Fail(401, errors.New("bad input"))
+	c.AbortWithError(401, errors.New("bad input"))
 	c.Writer.WriteHeaderNow()
 
 	assert.Equal(t, w.Code, 401)
@@ -434,7 +434,7 @@ func TestContextAutoBind(t *testing.T) {
 		Foo string `json:"foo"`
 		Bar string `json:"bar"`
 	}
-	assert.True(t, c.Bind(&obj))
+	assert.NoError(t, c.Bind(&obj))
 	assert.Equal(t, obj.Bar, "foo")
 	assert.Equal(t, obj.Foo, "bar")
 	assert.Equal(t, w.Body.Len(), 0)
@@ -450,7 +450,7 @@ func TestContextBadAutoBind(t *testing.T) {
 	}
 
 	assert.False(t, c.IsAborted())
-	assert.False(t, c.Bind(&obj))
+	assert.Error(t, c.Bind(&obj))
 	c.Writer.WriteHeaderNow()
 
 	assert.Empty(t, obj.Bar)
@@ -467,7 +467,7 @@ func TestContextBindWith(t *testing.T) {
 		Foo string `json:"foo"`
 		Bar string `json:"bar"`
 	}
-	assert.True(t, c.BindWith(&obj, binding.JSON))
+	assert.NoError(t, c.BindWith(&obj, binding.JSON))
 	assert.Equal(t, obj.Bar, "foo")
 	assert.Equal(t, obj.Foo, "bar")
 	assert.Equal(t, w.Body.Len(), 0)

errors.go

@@ -10,19 +10,33 @@ import (
 )
 
 const (
-	ErrorTypeInternal = 1 << iota
-	ErrorTypeExternal = 1 << iota
-	ErrorTypeAny      = 0xffffffff
+	ErrorTypeBind    = 1 << 31
+	ErrorTypeRender  = 1 << 30
+	ErrorTypePrivate = 1 << 0
+	ErrorTypePublic  = 1 << 1
+
+	ErrorTypeAny = 0xffffffff
+	ErrorTypeNu  = 2
 )
 
 // Used internally to collect errors that occurred during an http request.
 type errorMsg struct {
-	Error error       `json:"error"`
-	Flags int         `json:"-"`
-	Meta  interface{} `json:"meta"`
+	Error    error       `json:"error"`
+	Flags    int         `json:"-"`
+	Metadata interface{} `json:"meta"`
+}
+
+func (msg *errorMsg) Type(flags int) *errorMsg {
+	msg.Flags = flags
+	return msg
+}
+
+func (msg *errorMsg) Meta(data interface{}) *errorMsg {
+	msg.Metadata = data
+	return msg
 }
 
-type errorMsgs []errorMsg
+type errorMsgs []*errorMsg
 
 func (a errorMsgs) ByType(typ int) errorMsgs {
 	if len(a) == 0 {
@@ -54,7 +68,7 @@ func (a errorMsgs) String() string {
 	}
 	var buffer bytes.Buffer
 	for i, msg := range a {
-		fmt.Fprintf(&buffer, "Error #%02d: %s\n     Meta: %v\n", (i + 1), msg.Error, msg.Meta)
+		fmt.Fprintf(&buffer, "Error #%02d: %s\n     Meta: %v\n", (i + 1), msg.Error, msg.Metadata)
 	}
 	return buffer.String()
 }

middleware_test.go

@@ -169,7 +169,7 @@ func TestMiddlewareFailHandlersChain(t *testing.T) {
 	router := New()
 	router.Use(func(context *Context) {
 		signature += "A"
-		context.Fail(500, errors.New("foo"))
+		context.AbortWithError(500, errors.New("foo"))
 	})
 	router.Use(func(context *Context) {
 		signature += "B"