chore: support min go version 1.18 (#3511)

* chore: min go version 1.18

* fix build tag error

* remove build tag

* fix word

* remove any.go

* replace interface{} instead of any

.github/workflows/gin.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Setup go
         uses: actions/setup-go@v3
         with:
-          go-version: '^1.16'
+          go-version: '^1.18'
       - name: Checkout repository
         uses: actions/checkout@v3
       - name: Setup golangci-lint
@@ -31,7 +31,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
-        go: ['1.16', '1.17', '1.18', '1.19', '1.20']
+        go: ['1.18', '1.19', '1.20']
         test-tags: ['', '-tags nomsgpack', '-tags "sonic avx"', '-tags go_json']
         include:
           - os: ubuntu-latest
@@ -73,7 +73,7 @@ jobs:
           flags: ${{ matrix.os }},go-${{ matrix.go }},${{ matrix.test-tags }}
 
       - name: Format
-        if: matrix.go-version == '1.19.x'
+        if: matrix.go-version == '1.20.x'
         run: diff -u <(echo -n) <(gofmt -d .)
   notification-gitter:
     needs: test

.github/workflows/goreleaser.yml

@@ -21,7 +21,7 @@ jobs:
         name: Set up Go
         uses: actions/setup-go@v3
         with:
-          go-version: 1.17
+          go-version: 1.20
       -
         name: Run GoReleaser
         uses: goreleaser/goreleaser-action@v4

README.md

@@ -31,7 +31,7 @@ Gin is a web framework written in [Go](https://go.dev/). It features a martini-l
 
 ### Prerequisites
 
-- **[Go](https://go.dev/)**: ~~any one of the **three latest major** [releases](https://go.dev/doc/devel/release)~~ (now version **1.16+** is required).
+- **[Go](https://go.dev/)**: any one of the **three latest major** [releases](https://go.dev/doc/devel/release) (we test it with these).
 
 ### Getting Gin
 

binding/binding.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build !nomsgpack
-// +build !nomsgpack
 
 package binding
 

binding/binding_msgpack_test.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build !nomsgpack
-// +build !nomsgpack
 
 package binding
 

binding/binding_nomsgpack.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build nomsgpack
-// +build nomsgpack
 
 package binding
 

binding/json.go

@@ -15,7 +15,7 @@ import (
 
 // EnableDecoderUseNumber is used to call the UseNumber method on the JSON
 // Decoder instance. UseNumber causes the Decoder to unmarshal a number into an
-// interface{} as a Number instead of as a float64.
+// any as a Number instead of as a float64.
 var EnableDecoderUseNumber = false
 
 // EnableDecoderDisallowUnknownFields is used to call the DisallowUnknownFields method

binding/msgpack.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build !nomsgpack
-// +build !nomsgpack
 
 package binding
 

binding/msgpack_test.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build !nomsgpack
-// +build !nomsgpack
 
 package binding
 

context.go

@@ -652,7 +652,7 @@ func (c *Context) BindYAML(obj any) error {
 }
 
 // BindTOML is a shortcut for c.MustBindWith(obj, binding.TOML).
-func (c *Context) BindTOML(obj interface{}) error {
+func (c *Context) BindTOML(obj any) error {
 	return c.MustBindWith(obj, binding.TOML)
 }
 
@@ -717,7 +717,7 @@ func (c *Context) ShouldBindYAML(obj any) error {
 }
 
 // ShouldBindTOML is a shortcut for c.ShouldBindWith(obj, binding.TOML).
-func (c *Context) ShouldBindTOML(obj interface{}) error {
+func (c *Context) ShouldBindTOML(obj any) error {
 	return c.ShouldBindWith(obj, binding.TOML)
 }
 
@@ -995,7 +995,7 @@ func (c *Context) YAML(code int, obj any) {
 }
 
 // TOML serializes the given struct as TOML into the response body.
-func (c *Context) TOML(code int, obj interface{}) {
+func (c *Context) TOML(code int, obj any) {
 	c.Render(code, render.TOML{Data: obj})
 }
 

context_1.16_test.go → context_1.18_test.go

@@ -2,8 +2,7 @@
 // Use of this source code is governed by a MIT style
 // license that can be found in the LICENSE file.
 
-//go:build !go1.17
-// +build !go1.17
+//go:build !go1.19
 
 package gin
 
@@ -17,15 +16,22 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-func TestContextFormFileFailed16(t *testing.T) {
+func TestContextFormFileFailed18(t *testing.T) {
 	buf := new(bytes.Buffer)
 	mw := multipart.NewWriter(buf)
-	mw.Close()
+	defer func(mw *multipart.Writer) {
+		err := mw.Close()
+		if err != nil {
+			assert.Error(t, err)
+		}
+	}(mw)
 	c, _ := CreateTestContext(httptest.NewRecorder())
 	c.Request, _ = http.NewRequest("POST", "/", nil)
 	c.Request.Header.Set("Content-Type", mw.FormDataContentType())
 	c.engine.MaxMultipartMemory = 8 << 20
-	f, err := c.FormFile("file")
-	assert.Error(t, err)
-	assert.Nil(t, f)
+	assert.Panics(t, func() {
+		f, err := c.FormFile("file")
+		assert.Error(t, err)
+		assert.Nil(t, f)
+	})
 }

context_1.19_test.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build go1.19
-// +build go1.19
 
 package gin
 

context_appengine.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build appengine
-// +build appengine
 
 package gin
 

context_test.go

@@ -37,7 +37,7 @@ var errTestRender = errors.New("TestRender")
 // Unit tests TODO
 // func (c *Context) File(filepath string) {
 // func (c *Context) Negotiate(code int, config Negotiate) {
-// BAD case: func (c *Context) Render(code int, render render.Render, obj ...interface{}) {
+// BAD case: func (c *Context) Render(code int, render render.Render, obj ...any) {
 // test that information is not leaked when reusing Contexts (using the Pool)
 
 func createMultipartRequest() *http.Request {
@@ -2374,3 +2374,42 @@ func TestCreateTestContextWithRouteParams(t *testing.T) {
 	assert.Equal(t, http.StatusOK, w.Code)
 	assert.Equal(t, "hello gin", w.Body.String())
 }
+
+type interceptedWriter struct {
+	ResponseWriter
+	b *bytes.Buffer
+}
+
+func (i interceptedWriter) WriteHeader(code int) {
+	i.Header().Del("X-Test")
+	i.ResponseWriter.WriteHeader(code)
+}
+
+func TestInterceptedHeader(t *testing.T) {
+	w := httptest.NewRecorder()
+	c, r := CreateTestContext(w)
+
+	r.Use(func(c *Context) {
+		i := interceptedWriter{
+			ResponseWriter: c.Writer,
+			b:              bytes.NewBuffer(nil),
+		}
+		c.Writer = i
+		c.Next()
+		c.Header("X-Test", "overridden")
+		c.Writer = i.ResponseWriter
+	})
+	r.GET("/", func(c *Context) {
+		c.Header("X-Test", "original")
+		c.Header("X-Test-2", "present")
+		c.String(http.StatusOK, "hello world")
+	})
+	c.Request = httptest.NewRequest("GET", "/", nil)
+	r.HandleContext(c)
+	// Result() has headers frozen when WriteHeaderNow() has been called
+	// Compared to this time, this is when the response headers will be flushed
+	// As response is flushed on c.String, the Header cannot be set by the first
+	// middleware. Assert this
+	assert.Equal(t, "", w.Result().Header.Get("X-Test"))
+	assert.Equal(t, "present", w.Result().Header.Get("X-Test-2"))
+}

debug.go

@@ -12,7 +12,7 @@ import (
 	"strings"
 )
 
-const ginSupportMinGoVer = 16
+const ginSupportMinGoVer = 18
 
 // IsDebugging returns true if the framework is running in debug mode.
 // Use SetMode(gin.ReleaseMode) to disable debug mode.
@@ -67,7 +67,7 @@ func getMinVer(v string) (uint64, error) {
 
 func debugPrintWARNINGDefault() {
 	if v, e := getMinVer(runtime.Version()); e == nil && v < ginSupportMinGoVer {
-		debugPrint(`[WARNING] Now Gin requires Go 1.16+.
+		debugPrint(`[WARNING] Now Gin requires Go 1.18+.
 
 `)
 	}

debug_test.go

@@ -21,7 +21,7 @@ import (
 
 // TODO
 // func debugRoute(httpMethod, absolutePath string, handlers HandlersChain) {
-// func debugPrint(format string, values ...interface{}) {
+// func debugPrint(format string, values ...any) {
 
 func TestIsDebugging(t *testing.T) {
 	SetMode(DebugMode)
@@ -104,7 +104,7 @@ func TestDebugPrintWARNINGDefault(t *testing.T) {
 	})
 	m, e := getMinVer(runtime.Version())
 	if e == nil && m < ginSupportMinGoVer {
-		assert.Equal(t, "[GIN-debug] [WARNING] Now Gin requires Go 1.16+.\n\n[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.\n\n", re)
+		assert.Equal(t, "[GIN-debug] [WARNING] Now Gin requires Go 1.18+.\n\n[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.\n\n", re)
 	} else {
 		assert.Equal(t, "[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.\n\n", re)
 	}

deprecated.go

@@ -13,7 +13,7 @@ import (
 // BindWith binds the passed struct pointer using the specified binding engine.
 // See the binding package.
 func (c *Context) BindWith(obj any, b binding.Binding) error {
-	log.Println(`BindWith(\"interface{}, binding.Binding\") error is going to
+	log.Println(`BindWith(\"any, binding.Binding\") error is going to
 	be deprecated, please check issue #662 and either use MustBindWith() if you
 	want HTTP 400 to be automatically returned if any error occur, or use
 	ShouldBindWith() if you need to manage the error.`)