Added errors

Signed-off-by: Vishal Rana <vr@labstack.com>

README.md

@@ -16,7 +16,7 @@ Echo is a fast HTTP router (zero memory allocation) + micro web framework in Go.
 		- `http.Handler`
 		- `http.HandlerFunc`
 		- `func(http.ResponseWriter, *http.Request)`
-- Sub/Group router
+- Sub/Group routing
 - Handy encoding/decoding functions.
 - Serve static files, including index.
 
@@ -56,10 +56,14 @@ func init() {
 
 func createUser(c *echo.Context) {
 	u := new(user)
-	if c.Bind(u) {
+	if err := c.Bind(u); err == nil {
 		users[u.ID] = *u
-		c.JSON(http.StatusCreated, u)
+		if err := c.JSON(http.StatusCreated, u); err == nil {
+			// Do something!
+		}
+		return
 	}
+	http.Error(c.Response, http.StatusText(http.StatusBadRequest), http.StatusBadRequest)
 }
 
 func getUsers(c *echo.Context) {

context.go

@@ -31,20 +31,17 @@ func (c *Context) Param(n string) string {
 }
 
 // Bind decodes the payload into provided type based on Content-Type header.
-func (c *Context) Bind(i interface{}) bool {
-	var err error
+func (c *Context) Bind(i interface{}) (err error) {
 	ct := c.Request.Header.Get(HeaderContentType)
 	if strings.HasPrefix(ct, MIMEJSON) {
 		dec := json.NewDecoder(c.Request.Body)
-		err = dec.Decode(i)
+		if err = dec.Decode(i); err != nil {
+			err = ErrBindJSON
+		}
 	} else {
-		// TODO:
+		err = ErrUnsupportedContentType
 	}
-	if err != nil {
-		c.echo.internalServerErrorHandler(c)
-		return false
-	}
-	return true
+	return
 }
 
 // String sends a text/plain response with status code.
@@ -55,13 +52,14 @@ func (c *Context) String(n int, s string) {
 }
 
 // JSON sends an application/json response with status code.
-func (c *Context) JSON(n int, i interface{}) {
+func (c *Context) JSON(n int, i interface{}) (err error) {
 	enc := json.NewEncoder(c.Response)
 	c.Response.Header().Set(HeaderContentType, MIMEJSON+"; charset=utf-8")
 	c.Response.WriteHeader(n)
 	if err := enc.Encode(i); err != nil {
-		c.echo.internalServerErrorHandler(c)
+		err = ErrRenderJSON
 	}
+	return
 }
 
 // func (c *Context) File(n int, file, name string) {

echo.go

@@ -1,6 +1,7 @@
 package echo
 
 import (
+	"errors"
 	"log"
 	"net/http"
 	"sync"
@@ -55,6 +56,11 @@ var (
 		MethodPUT,
 		MethodTRACE,
 	}
+
+	// Errors
+	ErrUnsupportedContentType = errors.New("echo: unsupported content type")
+	ErrBindJSON               = errors.New("echo: bind json error")
+	ErrRenderJSON             = errors.New("echo: render json error")
 )
 
 // New creates a echo instance.

example/main.go

@@ -27,10 +27,14 @@ func init() {
 
 func createUser(c *echo.Context) {
 	u := new(user)
-	if c.Bind(u) {
+	if err := c.Bind(u); err == nil {
 		users[u.ID] = *u
-		c.JSON(http.StatusCreated, u)
+		if err := c.JSON(http.StatusCreated, u); err == nil {
+			// Do something!
+		}
+		return
 	}
+	http.Error(c.Response, http.StatusText(http.StatusBadRequest), http.StatusBadRequest)
 }
 
 func getUsers(c *echo.Context) {