🔀 Merge branch 'rel/0.2.0' into stable

Fixes https://codeberg.org/danjones000/gin-error-handler/issues/1

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.2.0] - 2024-02-07
+
+### Fixed
+
+- [Using HandlerWithError as Middleware allows response to be sent](https://codeberg.org/danjones000/gin-error-handler/issues/1)
+- Error response still sent if other response is already sent, resulting in duplicate body
+
 ## [0.1.0] - 2024-01-22
 
 🎉 Initial release

go.mod

@@ -3,7 +3,7 @@ module codeberg.org/danjones000/gin-error-handler
 go 1.21.5
 
 require (
-	codeberg.org/danjones000/responsable-errors v0.2.0
+	codeberg.org/danjones000/responsable-errors v0.2.1
 	github.com/gin-gonic/gin v1.9.1
 	github.com/stretchr/testify v1.8.4
 )

go.sum

@@ -1,7 +1,5 @@
-codeberg.org/danjones000/responsable-errors v0.1.1 h1:WTWo0egPNsp+kEKRK8R+yc/bfdEDUbwEjMnqgA7IklA=
+codeberg.org/danjones000/responsable-errors v0.2.1 h1:Ur6t+QZWaAfBgjQWBqSCgS3sTySdkKQD/FQefeRrm90=
-codeberg.org/danjones000/responsable-errors v0.1.1/go.mod h1:susEj39A/bflyej4tRirtuVKkmfUdhR2Skljwd/1ndI=
+codeberg.org/danjones000/responsable-errors v0.2.1/go.mod h1:susEj39A/bflyej4tRirtuVKkmfUdhR2Skljwd/1ndI=
-codeberg.org/danjones000/responsable-errors v0.2.0 h1:WUTBSaKQzkXHDYraHt3mxB4QHqVk78sKR/VeteXM1OY=
-codeberg.org/danjones000/responsable-errors v0.2.0/go.mod h1:susEj39A/bflyej4tRirtuVKkmfUdhR2Skljwd/1ndI=
 github.com/bytedance/sonic v1.5.0/go.mod h1:ED5hyg4y6t3/9Ku1R6dU/4KyJ48DZ4jPhfY1O2AihPM=
 github.com/bytedance/sonic v1.9.1 h1:6iJ6NqdoxCDr6mbY8h18oSO+cShGSMRGCEo7F2h0x8s=
 github.com/bytedance/sonic v1.9.1/go.mod h1:i736AoUSYt75HyZLoJW9ERYxcy6eaN6h4BZXU064P/U=

handler.go

@@ -25,6 +25,8 @@ func HandlerWithErrorWrapper(h HandlerWithError) gin.HandlerFunc {
 	return func(c *gin.Context) {
 		err := h(c)
 		if err != nil {
+			// We shouldn't process more handlers if there was an error
+			c.Abort()
 			c.Error(err)
 		}
 	}

int_test.go

@@ -0,0 +1,47 @@
+package handler
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	errors "codeberg.org/danjones000/responsable-errors"
+	"github.com/gin-gonic/gin"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestErrorMiddleware(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	w := httptest.NewRecorder()
+	_, r := gin.CreateTestContext(w)
+	r.Use(ErrorMiddleware())
+	r.Use(HandlerWithErrorWrapper(func(c *gin.Context) error {
+		return errors.Errorf(400, "Oops")
+	}))
+	r.GET("/", func(c *gin.Context) {
+		c.JSON(200, gin.H{"Hello": "World"})
+	})
+	req, _ := http.NewRequest("GET", "/", nil)
+	r.ServeHTTP(w, req)
+
+	assert.Equal(t, 400, w.Code)
+	assert.Equal(t, `{"error":"Oops"}`, w.Body.String())
+}
+
+func TestErrorNoResponseIfAlreadyWritten(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	w := httptest.NewRecorder()
+	_, r := gin.CreateTestContext(w)
+	r.Use(ErrorMiddleware())
+
+	r.GET("/", HandlerWithErrorWrapper(func(c *gin.Context) error {
+		c.JSON(200, gin.H{"Hello": "World"})
+		return errors.Errorf(400, "Oops")
+	}))
+	req, _ := http.NewRequest("GET", "/", nil)
+	r.ServeHTTP(w, req)
+
+	assert.Equal(t, 200, w.Code)
+	assert.Equal(t, `{"Hello":"World"}`, w.Body.String())
+
+}

middleware.go

@@ -55,7 +55,8 @@ func ErrorMiddleware(opts ...Option) gin.HandlerFunc {
 
 		c.Set("rendered_error", re)
 
-		// @todo check a response hasn't already been sent
+		if !c.Writer.Written() {
-		c.JSON(re.Status(), re)
+			c.JSON(re.Status(), re)
+		}
 	}
 }