🎨 Style: Clean up errcheck config

Globally ignore several methods that always return nil error.
Disable revive and gosec rules for error checking in favor of errcheck.

.golangci.yml

@@ -15,6 +15,11 @@ linters-settings:
      check-type-assertions: true
      check-blank: true
      disable-default-exclusions: true
+     exclude-functions:
+       - '(*bytes.Buffer).Write' # always returns nil error
+       - '(*github.com/valyala/bytebufferpool.ByteBuffer).Write' # always returns nil error
+       - '(*github.com/valyala/bytebufferpool.ByteBuffer).WriteByte' # always returns nil error
+       - '(*github.com/valyala/bytebufferpool.ByteBuffer).WriteString' # always returns nil error
 
   errchkjson:
     report-no-exported: true
@@ -40,7 +45,7 @@ linters-settings:
 
   gosec:
     excludes:
-      - G104
+      - G104 # Provided by errcheck
     config:
       global:
         audit: true
@@ -124,6 +129,9 @@ linters-settings:
         disabled: true
       - name: unchecked-type-assertion
         disabled: true # TODO https://github.com/gofiber/fiber/issues/2816
+      # Provided by errcheck
+      - name: unhandled-error
+        disabled: true
 
   stylecheck:
     checks:

ctx.go

@@ -829,11 +829,11 @@ func (c *DefaultCtx) Links(link ...string) {
 	bb := bytebufferpool.Get()
 	for i := range link {
 		if i%2 == 0 {
-			_ = bb.WriteByte('<')          //nolint:errcheck // This will never fail
+			bb.WriteByte('<')
-			_, _ = bb.WriteString(link[i]) //nolint:errcheck // This will never fail
+			bb.WriteString(link[i])
-			_ = bb.WriteByte('>')          //nolint:errcheck // This will never fail
+			bb.WriteByte('>')
 		} else {
-			_, _ = bb.WriteString(`; rel="` + link[i] + `",`) //nolint:errcheck // This will never fail
+			bb.WriteString(`; rel="` + link[i] + `",`)
 		}
 	}
 	c.setCanonical(HeaderLink, strings.TrimRight(c.app.getString(bb.Bytes()), ","))
@@ -1609,26 +1609,26 @@ func (c *DefaultCtx) String() string {
 	buf := bytebufferpool.Get()
 
 	// Start with the ID, converting it to a hex string without fmt.Sprintf
-	buf.WriteByte('#') //nolint:errcheck // It is fine to ignore the error
+	buf.WriteByte('#')
 	// Convert ID to hexadecimal
 	id := strconv.FormatUint(c.fasthttp.ID(), 16)
 	// Pad with leading zeros to ensure 16 characters
 	for i := 0; i < (16 - len(id)); i++ {
-		buf.WriteByte('0') //nolint:errcheck // It is fine to ignore the error
+		buf.WriteByte('0')
 	}
-	buf.WriteString(id)    //nolint:errcheck // It is fine to ignore the error
+	buf.WriteString(id)
-	buf.WriteString(" - ") //nolint:errcheck // It is fine to ignore the error
+	buf.WriteString(" - ")
 
 	// Add local and remote addresses directly
-	buf.WriteString(c.fasthttp.LocalAddr().String())  //nolint:errcheck // It is fine to ignore the error
+	buf.WriteString(c.fasthttp.LocalAddr().String())
-	buf.WriteString(" <-> ")                          //nolint:errcheck // It is fine to ignore the error
+	buf.WriteString(" <-> ")
-	buf.WriteString(c.fasthttp.RemoteAddr().String()) //nolint:errcheck // It is fine to ignore the error
+	buf.WriteString(c.fasthttp.RemoteAddr().String())
-	buf.WriteString(" - ")                            //nolint:errcheck // It is fine to ignore the error
+	buf.WriteString(" - ")
 
 	// Add method and URI
-	buf.Write(c.fasthttp.Request.Header.Method()) //nolint:errcheck // It is fine to ignore the error
+	buf.Write(c.fasthttp.Request.Header.Method())
-	buf.WriteByte(' ')                            //nolint:errcheck // It is fine to ignore the error
+	buf.WriteByte(' ')
-	buf.Write(c.fasthttp.URI().FullURI())         //nolint:errcheck // It is fine to ignore the error
+	buf.Write(c.fasthttp.URI().FullURI())
 
 	// Allocate string
 	str := buf.String()

ctx_test.go

@@ -3763,7 +3763,7 @@ func Test_Ctx_RenderWithBindVars(t *testing.T) {
 	err = c.Render("./.github/testdata/index.tmpl", Map{})
 	require.NoError(t, err)
 	buf := bytebufferpool.Get()
-	_, _ = buf.WriteString("overwrite") //nolint:errcheck // This will never fail
+	buf.WriteString("overwrite")
 	defer bytebufferpool.Put(buf)
 
 	require.NoError(t, err)
@@ -3786,7 +3786,7 @@ func Test_Ctx_RenderWithOverwrittenBind(t *testing.T) {
 	require.NoError(t, err)
 
 	buf := bytebufferpool.Get()
-	_, _ = buf.WriteString("overwrite") //nolint:errcheck // This will never fail
+	buf.WriteString("overwrite")
 	defer bytebufferpool.Put(buf)
 
 	require.Equal(t, "<h1>Hello from Fiber!</h1>", string(c.Response().Body()))

log/default.go

@@ -27,8 +27,8 @@ func (l *defaultLogger) privateLog(lv Level, fmtArgs []any) {
 	}
 	level := lv.toString()
 	buf := bytebufferpool.Get()
-	_, _ = buf.WriteString(level)                  //nolint:errcheck // It is fine to ignore the error
+	buf.WriteString(level)
-	_, _ = buf.WriteString(fmt.Sprint(fmtArgs...)) //nolint:errcheck // It is fine to ignore the error
+	buf.WriteString(fmt.Sprint(fmtArgs...))
 
 	_ = l.stdlog.Output(l.depth, buf.String()) //nolint:errcheck // It is fine to ignore the error
 	buf.Reset()
@@ -46,7 +46,7 @@ func (l *defaultLogger) privateLogf(lv Level, format string, fmtArgs []any) {
 	}
 	level := lv.toString()
 	buf := bytebufferpool.Get()
-	_, _ = buf.WriteString(level) //nolint:errcheck // It is fine to ignore the error
+	buf.WriteString(level)
 
 	if len(fmtArgs) > 0 {
 		_, _ = fmt.Fprintf(buf, format, fmtArgs...)
@@ -69,11 +69,11 @@ func (l *defaultLogger) privateLogw(lv Level, format string, keysAndValues []any
 	}
 	level := lv.toString()
 	buf := bytebufferpool.Get()
-	_, _ = buf.WriteString(level) //nolint:errcheck // It is fine to ignore the error
+	buf.WriteString(level)
 
 	// Write format privateLog buffer
 	if format != "" {
-		_, _ = buf.WriteString(format) //nolint:errcheck // It is fine to ignore the error
+		buf.WriteString(format)
 	}
 	// Write keys and values privateLog buffer
 	if len(keysAndValues) > 0 {
@@ -83,11 +83,11 @@ func (l *defaultLogger) privateLogw(lv Level, format string, keysAndValues []any
 
 		for i := 0; i < len(keysAndValues); i += 2 {
 			if i > 0 || format != "" {
-				_ = buf.WriteByte(' ') //nolint:errcheck // It is fine to ignore the error
+				buf.WriteByte(' ')
 			}
-			_, _ = buf.WriteString(keysAndValues[i].(string))          //nolint:errcheck // It is fine to ignore the error
+			buf.WriteString(keysAndValues[i].(string)) //nolint:forcetypeassert // Keys must be strings
-			_ = buf.WriteByte('=')                                     //nolint:errcheck // It is fine to ignore the error
+			buf.WriteByte('=')
-			_, _ = buf.WriteString(utils.ToString(keysAndValues[i+1])) //nolint:errcheck // It is fine to ignore the error
+			buf.WriteString(utils.ToString(keysAndValues[i+1]))
 		}
 	}
 

log/default_test.go

@@ -81,14 +81,14 @@ func Test_CtxLogger(t *testing.T) {
 	WithContext(ctx).Debugf("received %s order", work)
 	WithContext(ctx).Infof("starting %s", work)
 	WithContext(ctx).Warnf("%s may fail", work)
-	WithContext(ctx).Errorf("%s failed", work)
+	WithContext(ctx).Errorf("%s failed %d", work, 50)
 	WithContext(ctx).Panicf("%s panic", work)
 
 	require.Equal(t, "[Trace] trace work\n"+
 		"[Debug] received work order\n"+
 		"[Info] starting work\n"+
 		"[Warn] work may fail\n"+
-		"[Error] work failed\n"+
+		"[Error] work failed 50\n"+
 		"[Panic] work panic\n", string(w.b))
 }
 

middleware/etag/etag.go

@@ -53,14 +53,14 @@ func New(config ...Config) fiber.Handler {
 
 		// Enable weak tag
 		if cfg.Weak {
-			_, _ = bb.Write(weakPrefix) //nolint:errcheck // This will never fail
+			bb.Write(weakPrefix)
 		}
 
-		_ = bb.WriteByte('"') //nolint:errcheck // This will never fail
+		bb.WriteByte('"')
 		bb.B = appendUint(bb.Bytes(), uint32(len(body)))
-		_ = bb.WriteByte('-') //nolint:errcheck // This will never fail
+		bb.WriteByte('-')
 		bb.B = appendUint(bb.Bytes(), crc32.Checksum(body, crc32q))
-		_ = bb.WriteByte('"') //nolint:errcheck // This will never fail
+		bb.WriteByte('"')
 
 		etag := bb.Bytes()
 

middleware/logger/default_logger.go

@@ -33,9 +33,9 @@ func defaultLoggerInstance(c fiber.Ctx, data *Data, cfg Config) error {
 			if data.ChainErr != nil {
 				formatErr = colors.Red + " | " + data.ChainErr.Error() + colors.Reset
 			}
-			_, _ = buf.WriteString( //nolint:errcheck // This will never fail
+			buf.WriteString(
 				fmt.Sprintf("%s |%s %3d %s| %13v | %15s |%s %-7s %s| %-"+data.ErrPaddingStr+"s %s\n",
-					data.Timestamp.Load().(string),
+					data.Timestamp.Load().(string), //nolint:forcetypeassert // Timestamp is always a string
 					statusColor(c.Response().StatusCode(), colors), c.Response().StatusCode(), colors.Reset,
 					data.Stop.Sub(data.Start),
 					c.IP(),
@@ -53,45 +53,45 @@ func defaultLoggerInstance(c fiber.Ctx, data *Data, cfg Config) error {
 			fixedWidth := func(s string, width int, rightAlign bool) {
 				if rightAlign {
 					for i := len(s); i < width; i++ {
-						_ = buf.WriteByte(' ') //nolint:errcheck // It is fine to ignore the error
+						buf.WriteByte(' ')
 					}
-					_, _ = buf.WriteString(s) //nolint:errcheck // It is fine to ignore the error
+					buf.WriteString(s)
 				} else {
-					_, _ = buf.WriteString(s) //nolint:errcheck // It is fine to ignore the error
+					buf.WriteString(s)
 					for i := len(s); i < width; i++ {
-						_ = buf.WriteByte(' ') //nolint:errcheck // It is fine to ignore the error
+						buf.WriteByte(' ')
 					}
 				}
 			}
 
 			// Timestamp
-			_, _ = buf.WriteString(data.Timestamp.Load().(string)) //nolint:errcheck // It is fine to ignore the error
+			buf.WriteString(data.Timestamp.Load().(string)) //nolint:forcetypeassert // Timestamp is always a string
-			_, _ = buf.WriteString(" | ")                          //nolint:errcheck // It is fine to ignore the error
+			buf.WriteString(" | ")
 
 			// Status Code with 3 fixed width, right aligned
 			fixedWidth(strconv.Itoa(c.Response().StatusCode()), 3, true)
-			_, _ = buf.WriteString(" | ") //nolint:errcheck // It is fine to ignore the error
+			buf.WriteString(" | ")
 
 			// Duration with 13 fixed width, right aligned
 			fixedWidth(data.Stop.Sub(data.Start).String(), 13, true)
-			_, _ = buf.WriteString(" | ") //nolint:errcheck // It is fine to ignore the error
+			buf.WriteString(" | ")
 
 			// Client IP with 15 fixed width, right aligned
 			fixedWidth(c.IP(), 15, true)
-			_, _ = buf.WriteString(" | ") //nolint:errcheck // It is fine to ignore the error
+			buf.WriteString(" | ")
 
 			// HTTP Method with 7 fixed width, left aligned
 			fixedWidth(c.Method(), 7, false)
-			_, _ = buf.WriteString(" | ") //nolint:errcheck // It is fine to ignore the error
+			buf.WriteString(" | ")
 
 			// Path with dynamic padding for error message, left aligned
 			errPadding, _ := strconv.Atoi(data.ErrPaddingStr) //nolint:errcheck // It is fine to ignore the error
 			fixedWidth(c.Path(), errPadding, false)
 
 			// Error message
-			_, _ = buf.WriteString(" ")       //nolint:errcheck // It is fine to ignore the error
+			buf.WriteString(" ")
-			_, _ = buf.WriteString(formatErr) //nolint:errcheck // It is fine to ignore the error
+			buf.WriteString(formatErr)
-			_, _ = buf.WriteString("\n")      //nolint:errcheck // It is fine to ignore the error
+			buf.WriteString("\n")
 		}
 
 		// Write buffer to output
@@ -112,7 +112,7 @@ func defaultLoggerInstance(c fiber.Ctx, data *Data, cfg Config) error {
 	// Loop over template parts execute dynamic parts and add fixed parts to the buffer
 	for i, logFunc := range data.LogFuncChain {
 		if logFunc == nil {
-			_, _ = buf.Write(data.TemplateChain[i]) //nolint:errcheck // This will never fail
+			buf.Write(data.TemplateChain[i])
 		} else if data.TemplateChain[i] == nil {
 			_, err = logFunc(buf, c, data, "")
 		} else {
@@ -125,7 +125,7 @@ func defaultLoggerInstance(c fiber.Ctx, data *Data, cfg Config) error {
 
 	// Also write errors to the buffer
 	if err != nil {
-		_, _ = buf.WriteString(err.Error()) //nolint:errcheck // This will never fail
+		buf.WriteString(err.Error())
 	}
 
 	mu.Lock()

middleware/session/store.go

@@ -75,7 +75,7 @@ func (s *Store) Get(c fiber.Ctx) (*Session, error) {
 		if raw != nil && err == nil {
 			mux.Lock()
 			defer mux.Unlock()
-			_, _ = sess.byteBuffer.Write(raw) //nolint:errcheck // This will never fail
+			sess.byteBuffer.Write(raw)
 			encCache := gob.NewDecoder(sess.byteBuffer)
 			err := encCache.Decode(&sess.data.Data)
 			if err != nil {

redirect.go

@@ -207,10 +207,10 @@ func (r *Redirect) Route(name string, config ...RedirectConfig) error {
 
 		// flash messages
 		for i, message := range r.messages {
-			_, _ = messageText.WriteString(message) //nolint:errcheck // Always return nil
+			messageText.WriteString(message)
 			// when there are more messages or oldInput -> add a comma
 			if len(r.messages)-1 != i || (len(r.messages)-1 == i && len(r.oldInput) > 0) {
-				_, _ = messageText.WriteString(CookieDataSeparator) //nolint:errcheck // Always return nil
+				messageText.WriteString(CookieDataSeparator)
 			}
 		}
 		r.messages = r.messages[:0]
@@ -218,9 +218,9 @@ func (r *Redirect) Route(name string, config ...RedirectConfig) error {
 		// old input data
 		i := 1
 		for k, v := range r.oldInput {
-			_, _ = messageText.WriteString(OldInputDataPrefix + k + CookieDataAssigner + v) //nolint:errcheck // Always return nil
+			messageText.WriteString(OldInputDataPrefix + k + CookieDataAssigner + v)
 			if len(r.oldInput) != i {
-				_, _ = messageText.WriteString(CookieDataSeparator) //nolint:errcheck // Always return nil
+				messageText.WriteString(CookieDataSeparator)
 			}
 			i++
 		}
@@ -239,10 +239,10 @@ func (r *Redirect) Route(name string, config ...RedirectConfig) error {
 
 		i := 1
 		for k, v := range cfg.Queries {
-			_, _ = queryText.WriteString(k + "=" + v) //nolint:errcheck // Always return nil
+			queryText.WriteString(k + "=" + v)
 
 			if i != len(cfg.Queries) {
-				_, _ = queryText.WriteString("&") //nolint:errcheck // Always return nil
+				queryText.WriteString("&")
 			}
 			i++
 		}

redirect_test.go

@@ -341,14 +341,17 @@ func Benchmark_Redirect_Route(b *testing.B) {
 	b.ReportAllocs()
 	b.ResetTimer()
 
+	var err error
+
 	for n := 0; n < b.N; n++ {
-		c.Redirect().Route("user", RedirectConfig{ //nolint:errcheck,revive // we don't need to handle error here
+		err = c.Redirect().Route("user", RedirectConfig{
 			Params: Map{
 				"name": "fiber",
 			},
 		})
 	}
 
+	require.NoError(b, err)
 	require.Equal(b, 302, c.Response().StatusCode())
 	require.Equal(b, "/user/fiber", string(c.Response().Header.Peek(HeaderLocation)))
 }
@@ -365,8 +368,10 @@ func Benchmark_Redirect_Route_WithQueries(b *testing.B) {
 	b.ReportAllocs()
 	b.ResetTimer()
 
+	var err error
+
 	for n := 0; n < b.N; n++ {
-		c.Redirect().Route("user", RedirectConfig{ //nolint:errcheck,revive // we don't need to handle error here
+		err = c.Redirect().Route("user", RedirectConfig{
 			Params: Map{
 				"name": "fiber",
 			},
@@ -374,6 +379,7 @@ func Benchmark_Redirect_Route_WithQueries(b *testing.B) {
 		})
 	}
 
+	require.NoError(b, err)
 	require.Equal(b, 302, c.Response().StatusCode())
 	// analysis of query parameters with url parsing, since a map pass is always randomly ordered
 	location, err := url.Parse(string(c.Response().Header.Peek(HeaderLocation)))
@@ -394,10 +400,13 @@ func Benchmark_Redirect_Route_WithFlashMessages(b *testing.B) {
 	b.ReportAllocs()
 	b.ResetTimer()
 
+	var err error
+
 	for n := 0; n < b.N; n++ {
-		c.Redirect().With("success", "1").With("message", "test").Route("user") //nolint:errcheck,revive // we don't need to handle error here
+		err = c.Redirect().With("success", "1").With("message", "test").Route("user")
 	}
 
+	require.NoError(b, err)
 	require.Equal(b, 302, c.Response().StatusCode())
 	require.Equal(b, "/user", string(c.Response().Header.Peek(HeaderLocation)))