Added a optional config variable to disable centralized error handler in recovery middleware (#2410)

Added a config variable to disable centralized error handler in recovery middleware

Author: Omkar-C

middleware/recover.go

@@ -38,6 +38,11 @@ type (
 		// LogErrorFunc defines a function for custom logging in the middleware.
 		// If it's set you don't need to provide LogLevel for config.
 		LogErrorFunc LogErrorFunc
+
+		// DisableErrorHandler disables the call to centralized HTTPErrorHandler.
+		// The recovered error is then passed back to upstream middleware, instead of swallowing the error.
+		// Optional. Default value false.
+		DisableErrorHandler bool `yaml:"disable_error_handler"`
 	}
 )
 
@@ -50,6 +55,7 @@ var (
 		DisablePrintStack: false,
 		LogLevel:          0,
 		LogErrorFunc:      nil,
+		DisableErrorHandler: false,
 	}
 )
 
@@ -71,7 +77,7 @@ func RecoverWithConfig(config RecoverConfig) echo.MiddlewareFunc {
 	}
 
 	return func(next echo.HandlerFunc) echo.HandlerFunc {
-		return func(c echo.Context) error {
+		return func(c echo.Context) (returnErr error) {
 			if config.Skipper(c) {
 				return next(c)
 			}
@@ -113,7 +119,12 @@ func RecoverWithConfig(config RecoverConfig) echo.MiddlewareFunc {
 							c.Logger().Print(msg)
 						}
 					}
-					c.Error(err)
+
+					if(!config.DisableErrorHandler) {
+						c.Error(err)
+					} else {
+						returnErr = err
+					}
 				}
 			}()
 			return next(c)

middleware/recover_test.go

@@ -23,7 +23,8 @@ func TestRecover(t *testing.T) {
 	h := Recover()(echo.HandlerFunc(func(c echo.Context) error {
 		panic("test")
 	}))
-	h(c)
+	err := h(c)
+	assert.NoError(t, err)
 	assert.Equal(t, http.StatusInternalServerError, rec.Code)
 	assert.Contains(t, buf.String(), "PANIC RECOVER")
 }
@@ -163,3 +164,23 @@ func TestRecoverWithConfig_LogErrorFunc(t *testing.T) {
 		assert.Contains(t, output, `"level":"ERROR"`)
 	})
 }
+
+func TestRecoverWithDisabled_ErrorHandler(t *testing.T) {
+	e := echo.New()
+	buf := new(bytes.Buffer)
+	e.Logger.SetOutput(buf)
+	req := httptest.NewRequest(http.MethodGet, "/", nil)
+	rec := httptest.NewRecorder()
+	c := e.NewContext(req, rec)
+
+	config := DefaultRecoverConfig
+	config.DisableErrorHandler = true
+	h := RecoverWithConfig(config)(echo.HandlerFunc(func(c echo.Context) error {
+		panic("test")
+	}))
+	err := h(c)
+
+	assert.Equal(t, http.StatusOK, rec.Code)
+	assert.Contains(t, buf.String(), "PANIC RECOVER")
+	assert.EqualError(t, err, "test")
+}