🧹 chore: Improve Performance of Fiber Router (#3261)

* Initial improvements

* Update test

* Improve RemoveEscapeChar performance

* Fix lint issues

* Re-add comments

* Add dedicated request handlers

* Fix lint issues

* Add test case for app.All with custom method

* Add test for custom Ctx and Request Methods

* Simplify test logic

* Simplify test

.github/workflows/linter.yml

@@ -37,4 +37,4 @@ jobs:
         uses: golangci/golangci-lint-action@v6
         with:
           # NOTE: Keep this in sync with the version from .golangci.yml
-          version: v1.62.0
+          version: v1.62.2

Makefile

@@ -35,7 +35,7 @@ markdown:
 ## lint: 🚨 Run lint checks
 .PHONY: lint
 lint:
-	go run github.com/golangci/golangci-lint/cmd/[email protected].0 run ./...
+	go run github.com/golangci/golangci-lint/cmd/[email protected].2 run ./...
 
 ## test: 🚦 Execute all tests
 .PHONY: test

app.go

@@ -616,6 +616,10 @@ func (app *App) handleTrustedProxy(ipAddress string) {
 // Note: It doesn't allow adding new methods, only customizing exist methods.
 func (app *App) NewCtxFunc(function func(app *App) CustomCtx) {
 	app.newCtxFunc = function
+
+	if app.server != nil {
+		app.server.Handler = app.customRequestHandler
+	}
 }
 
 // RegisterCustomConstraint allows to register custom constraint.
@@ -868,7 +872,11 @@ func (app *App) Config() Config {
 func (app *App) Handler() fasthttp.RequestHandler { //revive:disable-line:confusing-naming // Having both a Handler() (uppercase) and a handler() (lowercase) is fine. TODO: Use nolint:revive directive instead. See https://github.com/golangci/golangci-lint/issues/3476
 	// prepare the server for the start
 	app.startupProcess()
-	return app.requestHandler
+
+	if app.newCtxFunc != nil {
+		return app.customRequestHandler
+	}
+	return app.defaultRequestHandler
 }
 
 // Stack returns the raw router stack.
@@ -1057,7 +1065,11 @@ func (app *App) init() *App {
 	}
 
 	// fasthttp server settings
-	app.server.Handler = app.requestHandler
+	if app.newCtxFunc != nil {
+		app.server.Handler = app.customRequestHandler
+	} else {
+		app.server.Handler = app.defaultRequestHandler
+	}
 	app.server.Name = app.config.ServerHeader
 	app.server.Concurrency = app.config.Concurrency
 	app.server.NoDefaultDate = app.config.DisableDefaultDate

app_test.go

@@ -581,32 +581,51 @@ func Test_App_Use_StrictRouting(t *testing.T) {
 
 func Test_App_Add_Method_Test(t *testing.T) {
 	t.Parallel()
-	defer func() {
-		if err := recover(); err != nil {
-			require.Equal(t, "add: invalid http method JANE\n", fmt.Sprintf("%v", err))
-		}
-	}()
 
 	methods := append(DefaultMethods, "JOHN") //nolint:gocritic // We want a new slice here
 	app := New(Config{
 		RequestMethods: methods,
 	})
 
-	app.Add([]string{"JOHN"}, "/doe", testEmptyHandler)
+	app.Add([]string{"JOHN"}, "/john", testEmptyHandler)
 
-	resp, err := app.Test(httptest.NewRequest("JOHN", "/doe", nil))
+	resp, err := app.Test(httptest.NewRequest("JOHN", "/john", nil))
 	require.NoError(t, err, "app.Test(req)")
 	require.Equal(t, StatusOK, resp.StatusCode, "Status code")
 
-	resp, err = app.Test(httptest.NewRequest(MethodGet, "/doe", nil))
+	resp, err = app.Test(httptest.NewRequest(MethodGet, "/john", nil))
 	require.NoError(t, err, "app.Test(req)")
 	require.Equal(t, StatusMethodNotAllowed, resp.StatusCode, "Status code")
 
-	resp, err = app.Test(httptest.NewRequest("UNKNOWN", "/doe", nil))
+	resp, err = app.Test(httptest.NewRequest("UNKNOWN", "/john", nil))
 	require.NoError(t, err, "app.Test(req)")
 	require.Equal(t, StatusNotImplemented, resp.StatusCode, "Status code")
 
-	app.Add([]string{"JANE"}, "/doe", testEmptyHandler)
+	// Add a new method
+	require.Panics(t, func() {
+		app.Add([]string{"JANE"}, "/jane", testEmptyHandler)
+	})
+}
+
+func Test_App_All_Method_Test(t *testing.T) {
+	t.Parallel()
+
+	methods := append(DefaultMethods, "JOHN") //nolint:gocritic // We want a new slice here
+	app := New(Config{
+		RequestMethods: methods,
+	})
+
+	// Add a new method with All
+	app.All("/doe", testEmptyHandler)
+
+	resp, err := app.Test(httptest.NewRequest("JOHN", "/doe", nil))
+	require.NoError(t, err, "app.Test(req)")
+	require.Equal(t, StatusOK, resp.StatusCode, "Status code")
+
+	// Add a new method
+	require.Panics(t, func() {
+		app.Add([]string{"JANE"}, "/jane", testEmptyHandler)
+	})
 }
 
 // go test -run Test_App_GETOnly

binder/mapping.go

@@ -107,8 +107,7 @@ func parseToStruct(aliasTag string, out any, data map[string][]string) error {
 func parseToMap(ptr any, data map[string][]string) error {
 	elem := reflect.TypeOf(ptr).Elem()
 
-	//nolint:exhaustive // it's not necessary to check all types
-	switch elem.Kind() {
+	switch elem.Kind() { //nolint:exhaustive // it's not necessary to check all types
 	case reflect.Slice:
 		newMap, ok := ptr.(map[string][]string)
 		if !ok {
@@ -129,7 +128,6 @@ func parseToMap(ptr any, data map[string][]string) error {
 				newMap[k] = ""
 				continue
 			}
-
 			newMap[k] = v[len(v)-1]
 		}
 	}

ctx_test.go

@@ -127,6 +127,35 @@ func Test_Ctx_CustomCtx(t *testing.T) {
 	require.Equal(t, "prefix_v3", string(body))
 }
 
+// go test -run Test_Ctx_CustomCtx
+func Test_Ctx_CustomCtx_and_Method(t *testing.T) {
+	t.Parallel()
+
+	// Create app with custom request methods
+	methods := append(DefaultMethods, "JOHN") //nolint:gocritic // We want a new slice here
+	app := New(Config{
+		RequestMethods: methods,
+	})
+
+	// Create custom context
+	app.NewCtxFunc(func(app *App) CustomCtx {
+		return &customCtx{
+			DefaultCtx: *NewDefaultCtx(app),
+		}
+	})
+
+	// Add route with custom method
+	app.Add([]string{"JOHN"}, "/doe", testEmptyHandler)
+	resp, err := app.Test(httptest.NewRequest("JOHN", "/doe", nil))
+	require.NoError(t, err, "app.Test(req)")
+	require.Equal(t, StatusOK, resp.StatusCode, "Status code")
+
+	// Add a new method
+	require.Panics(t, func() {
+		app.Add([]string{"JANE"}, "/jane", testEmptyHandler)
+	})
+}
+
 // go test -run Test_Ctx_Accepts_EmptyAccept
 func Test_Ctx_Accepts_EmptyAccept(t *testing.T) {
 	t.Parallel()

path.go

@@ -620,10 +620,16 @@ func GetTrimmedParam(param string) string {
 
 // RemoveEscapeChar remove escape characters
 func RemoveEscapeChar(word string) string {
-	if strings.IndexByte(word, escapeChar) != -1 {
-		return strings.ReplaceAll(word, string(escapeChar), "")
+	b := []byte(word)
+	dst := 0
+	for src := 0; src < len(b); src++ {
+		if b[src] == '\\' {
+			continue
+		}
+		b[dst] = b[src]
+		dst++
 	}
-	return word
+	return string(b[:dst])
 }
 
 func getParamConstraintType(constraintPart string) TypeConstraint {