friendly error handling

due to c.Error() is not friendly to golint and useless returned,
thought to remove it.

context.go

@@ -199,9 +199,10 @@ func (c *Context) AbortWithStatusJSON(code int, jsonObj interface{}) {
 // AbortWithError calls `AbortWithStatus()` and `Error()` internally.
 // This method stops the chain, writes the status code and pushes the specified error to `c.Errors`.
 // See Context.Error() for more details.
-func (c *Context) AbortWithError(code int, err error) *Error {
+func (c *Context) AbortWithError(code int, err error) {
 	c.AbortWithStatus(code)
-	return c.Error(err)
+	c.Error(err)
+	return
 }
 
 /************************************/
@@ -212,10 +213,10 @@ func (c *Context) AbortWithError(code int, err error) *Error {
 // 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.
-// Error will panic if err is nil.
-func (c *Context) Error(err error) *Error {
+// Error will ignore if err is nil.
+func (c *Context) Error(err error) {
 	if err == nil {
-		panic("err is nil")
+		return
 	}
 
 	parsedError, ok := err.(*Error)
@@ -227,7 +228,30 @@ func (c *Context) Error(err error) *Error {
 	}
 
 	c.Errors = append(c.Errors, parsedError)
-	return parsedError
+	return
+}
+
+// ErrorBindType attaches an error to the current context with specific ErrorType. 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) ErrorBindType(err error, typ ErrorType) {
+	if err == nil {
+		return
+	}
+
+	parsedError, ok := err.(*Error)
+	if !ok {
+		parsedError = &Error{
+			Err:  err,
+			Type: typ,
+		}
+	} else {
+		parsedError.SetType(typ)
+	}
+
+	c.Errors = append(c.Errors, parsedError)
+	return
 }
 
 /************************************/
@@ -633,7 +657,7 @@ func (c *Context) BindHeader(obj interface{}) error {
 // It will abort the request with HTTP 400 if any error occurs.
 func (c *Context) BindUri(obj interface{}) error {
 	if err := c.ShouldBindUri(obj); err != nil {
-		c.AbortWithError(http.StatusBadRequest, err).SetType(ErrorTypeBind) // nolint: errcheck
+		c.AbortWithError(http.StatusBadRequest, WrapError(err).SetType(ErrorTypeBind)) // nolint: errcheck
 		return err
 	}
 	return nil
@@ -644,7 +668,7 @@ func (c *Context) BindUri(obj interface{}) error {
 // See the binding package.
 func (c *Context) MustBindWith(obj interface{}, b binding.Binding) error {
 	if err := c.ShouldBindWith(obj, b); err != nil {
-		c.AbortWithError(http.StatusBadRequest, err).SetType(ErrorTypeBind) // nolint: errcheck
+		c.AbortWithError(http.StatusBadRequest, WrapError(err).SetType(ErrorTypeBind)) // nolint: errcheck
 		return err
 	}
 	return nil

context_test.go

@@ -1354,19 +1354,12 @@ func TestContextError(t *testing.T) {
 	assert.Equal(t, ErrorTypePublic, c.Errors[1].Type)
 
 	assert.Equal(t, c.Errors.Last(), c.Errors[1])
-
-	defer func() {
-		if recover() == nil {
-			t.Error("didn't panic")
-		}
-	}()
-	c.Error(nil) // nolint: errcheck
 }
 
 func TestContextTypedError(t *testing.T) {
 	c, _ := CreateTestContext(httptest.NewRecorder())
-	c.Error(errors.New("externo 0")).SetType(ErrorTypePublic)  // nolint: errcheck
-	c.Error(errors.New("interno 0")).SetType(ErrorTypePrivate) // nolint: errcheck
+	c.ErrorBindType(errors.New("externo 0"), ErrorTypePublic)
+	c.ErrorBindType(errors.New("interno 0"), ErrorTypePrivate)
 
 	for _, err := range c.Errors.ByType(ErrorTypePublic) {
 		assert.Equal(t, ErrorTypePublic, err.Type)
@@ -1381,7 +1374,8 @@ func TestContextAbortWithError(t *testing.T) {
 	w := httptest.NewRecorder()
 	c, _ := CreateTestContext(w)
 
-	c.AbortWithError(http.StatusUnauthorized, errors.New("bad input")).SetMeta("some input") // nolint: errcheck
+	err := WrapError(errors.New("bad input")).SetMeta("some input")
+	c.AbortWithError(http.StatusUnauthorized, err) // nolint: errcheck
 
 	assert.Equal(t, http.StatusUnauthorized, w.Code)
 	assert.Equal(t, abortIndex, c.index)

errors.go

@@ -41,6 +41,13 @@ type errorMsgs []*Error
 
 var _ error = &Error{}
 
+// WrapError return Error wraps original error.
+func WrapError(err error) *Error {
+	return &Error{
+		Err: err,
+	}
+}
+
 // SetType sets the error's type.
 func (msg *Error) SetType(flags ErrorType) *Error {
 	msg.Type = flags