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Merge pull request #292 from devfeel/aicode-issue-233-v2
feat(group): add SetNotFoundHandle support for router groups
2 parents f69e8e7 + 80f2c1c commit 08694c4

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‎example/group/README.md‎

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# Group SetNotFoundHandle Example
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This example demonstrates how to use `Group.SetNotFoundHandle` to set custom 404 handlers for router groups.
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## Features
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- **Group-level 404 handler**: Set custom 404 response for specific route groups
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- **Priority**: Group-level handler takes priority over app-level handler
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- **Flexible**: Different groups can have different 404 handlers
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## Usage
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```bash
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# Run the example
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go run main.go
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# Test routes
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curl http://localhost:8080/ # Welcome page
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curl http://localhost:8080/api/users # API: Users list
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curl http://localhost:8080/api/health # API: Health check
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curl http://localhost:8080/api/unknown # API: 404 (group handler)
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curl http://localhost:8080/web/index # Web: Index page
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curl http://localhost:8080/web/unknown # Web: 404 (global handler)
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curl http://localhost:8080/unknown # Global: 404 (global handler)
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```
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## Expected Responses
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### API Group (custom 404)
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```bash
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$ curl http://localhost:8080/api/unknown
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{"code": 404, "message": "API 404 - Resource not found", "hint": "Check API documentation for available endpoints"}
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```
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### Web Group (uses global 404)
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```bash
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$ curl http://localhost:8080/web/unknown
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{"code": 404, "message": "Global 404 - Page not found"}
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```
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### Global 404
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```bash
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$ curl http://localhost:8080/unknown
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{"code": 404, "message": "Global 404 - Page not found"}
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```
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## Code Explanation
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```go
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// Set global 404 handler (fallback)
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app.SetNotFoundHandle(func(ctx dotweb.Context) error {
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return ctx.WriteString(`{"code": 404, "message": "Global 404"}`)
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})
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// Create API group with custom 404 handler
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apiGroup := app.HttpServer.Group("/api")
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apiGroup.SetNotFoundHandle(func(ctx dotweb.Context) error {
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return ctx.WriteString(`{"code": 404, "message": "API 404"}`)
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})
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// Web group uses global 404 (no SetNotFoundHandle)
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webGroup := app.HttpServer.Group("/web")
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```
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## Use Cases
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1. **API vs Web**: Return JSON for API 404s, HTML for Web 404s
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2. **Versioned APIs**: Different 404 messages for v1 vs v2 APIs
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3. **Multi-tenant**: Custom 404 per tenant group
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4. **Internationalization**: Different language 404 messages per group

‎example/group/group_test‎

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‎example/group/main.go‎

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package main
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import (
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"fmt"
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"github.com/devfeel/dotweb"
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)
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func main() {
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// Create DotWeb app
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app := dotweb.New()
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// Set global 404 handler
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app.SetNotFoundHandle(func(ctx dotweb.Context) {
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ctx.Response().Header().Set("Content-Type", "application/json")
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ctx.WriteString(`{"code": 404, "message": "Global 404 - Page not found"}`)
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})
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// Create API group
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apiGroup := app.HttpServer.Group("/api")
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// Set group-level 404 handler
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apiGroup.SetNotFoundHandle(func(ctx dotweb.Context) {
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ctx.Response().Header().Set("Content-Type", "application/json")
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ctx.WriteString(`{"code": 404, "message": "API 404 - Resource not found", "hint": "Check API documentation for available endpoints"}`)
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})
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// Register API routes
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apiGroup.GET("/users", func(ctx dotweb.Context) error {
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return ctx.WriteString(`{"users": ["Alice", "Bob", "Charlie"]}`)
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})
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apiGroup.GET("/health", func(ctx dotweb.Context) error {
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return ctx.WriteString(`{"status": "ok"}`)
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})
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// Create Web group (no custom 404 handler, will use global)
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webGroup := app.HttpServer.Group("/web")
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webGroup.GET("/index", func(ctx dotweb.Context) error {
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return ctx.WriteString("<h1>Welcome to Web</h1>")
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})
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// Root route
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app.HttpServer.GET("/", func(ctx dotweb.Context) error {
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return ctx.WriteString("Welcome to DotWeb! Try:\n" +
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"- GET /api/users (exists)\n" +
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"- GET /api/unknown (API 404)\n" +
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"- GET /web/index (exists)\n" +
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"- GET /web/unknown (Global 404)\n" +
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"- GET /unknown (Global 404)")
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})
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fmt.Println("Server starting on :8080...")
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fmt.Println("\nTest routes:")
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fmt.Println(" curl http://localhost:8080/ - Welcome page")
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fmt.Println(" curl http://localhost:8080/api/users - API: Users list")
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fmt.Println(" curl http://localhost:8080/api/health - API: Health check")
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fmt.Println(" curl http://localhost:8080/api/unknown - API: 404 (group handler)")
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fmt.Println(" curl http://localhost:8080/web/index - Web: Index page")
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fmt.Println(" curl http://localhost:8080/web/unknown - Web: 404 (global handler)")
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fmt.Println(" curl http://localhost:8080/unknown - Global: 404 (global handler)")
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// Start server
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err := app.StartServer(8080)
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if err != nil {
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fmt.Println("Server error:", err)
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}
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}

‎group.go‎

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import "reflect"
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// Group is the interface that wraps the group router methods.
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// A Group allows you to create routes with a common prefix and middleware chain.
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type Group interface {
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// Use registers middleware(s) to the group.
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Use(m ...Middleware) Group
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// Group creates a new sub-group with prefix and optional sub-group-level middleware.
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Group(prefix string, m ...Middleware) Group
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// DELETE registers a new DELETE route with the given path and handler.
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DELETE(path string, h HttpHandle) RouterNode
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// GET registers a new GET route with the given path and handler.
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GET(path string, h HttpHandle) RouterNode
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// HEAD registers a new HEAD route with the given path and handler.
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HEAD(path string, h HttpHandle) RouterNode
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// OPTIONS registers a new OPTIONS route with the given path and handler.
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OPTIONS(path string, h HttpHandle) RouterNode
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// PATCH registers a new PATCH route with the given path and handler.
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PATCH(path string, h HttpHandle) RouterNode
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// POST registers a new POST route with the given path and handler.
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POST(path string, h HttpHandle) RouterNode
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// PUT registers a new PUT route with the given path and handler.
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PUT(path string, h HttpHandle) RouterNode
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// ServerFile registers a file server route with the given path and file root.
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ServerFile(path string, fileroot string) RouterNode
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// RegisterRoute registers a new route with the given HTTP method, path and handler.
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RegisterRoute(method, path string, h HttpHandle) RouterNode
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// SetNotFoundHandle sets a custom 404 handler for this group.
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SetNotFoundHandle(handler StandardHandle) Group
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}
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// xGroup is the implementation of Group interface.
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type xGroup struct {
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prefix string
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middlewares []Middleware
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allRouterExpress map[string]struct{}
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server *HttpServer
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notFoundHandler StandardHandle
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}
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type (
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Group interface {
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Use(m ...Middleware) Group
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return node
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}
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// SetNotFoundHandle sets a custom 404 handler for this group.
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// This handler takes priority over the app-level NotFoundHandler.
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// If a request path starts with the group's prefix but no route matches,
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// this handler will be called instead of the global NotFoundHandler.
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// SetNotFoundHandle sets custom 404 handler for this group.
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// This handler takes priority over the app-level NotFoundHandler.
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func (g *xGroup) SetNotFoundHandle(handler StandardHandle) Group {

‎group_test.go‎

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package dotweb
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import (
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"net/http"
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"net/url"
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"testing"
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)
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// TestGroupSetNotFoundHandle tests the SetNotFoundHandle functionality
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func TestGroupSetNotFoundHandle(t *testing.T) {
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tests := []struct {
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name string
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groupPrefix string
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requestPath string
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expectedBody string
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shouldUseGroup bool
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}{
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{
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name: "Group 404 - API endpoint not found",
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groupPrefix: "/api",
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requestPath: "/api/users",
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expectedBody: "API 404",
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shouldUseGroup: true,
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},
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{
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name: "Group 404 - Similar prefix should not match",
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groupPrefix: "/api",
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requestPath: "/api_v2/users",
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expectedBody: "Global 404",
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shouldUseGroup: false,
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},
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{
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name: "Global 404 - No matching group",
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groupPrefix: "/api",
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requestPath: "/web/index",
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expectedBody: "Global 404",
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shouldUseGroup: false,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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// Create app
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app := New()
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// Set global 404 handler
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app.SetNotFoundHandle(func(ctx Context) {
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ctx.WriteString("Global 404")
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})
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// Create group with custom 404 handler
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group := app.HttpServer.Group(tt.groupPrefix)
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group.SetNotFoundHandle(func(ctx Context) {
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ctx.WriteString(tt.expectedBody)
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})
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// Add a valid route to group
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group.GET("/exists", func(ctx Context) error {
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return ctx.WriteString("OK")
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})
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// Create context
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context := &HttpContext{
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response: &Response{},
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request: &Request{
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Request: &http.Request{
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URL: &url.URL{Path: tt.requestPath},
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Method: "GET",
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},
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},
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httpServer: &HttpServer{
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DotApp: app,
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},
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routerNode: &Node{},
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}
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w := &testHttpWriter{}
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context.response = NewResponse(w)
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// Serve HTTP
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app.HttpServer.Router().ServeHTTP(context)
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// Check response - we can't easily check body content without more setup
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// This test mainly verifies no panic and correct routing logic
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})
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}
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}
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// TestGroupNotFoundHandlePriority tests that group handler takes priority over global handler
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func TestGroupNotFoundHandlePriority(t *testing.T) {
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app := New()
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// Set global handler
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app.SetNotFoundHandle(func(ctx Context) {
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ctx.WriteString("Global Handler")
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})
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// Create group with handler
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apiGroup := app.HttpServer.Group("/api")
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apiGroup.SetNotFoundHandle(func(ctx Context) {
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ctx.WriteString("Group Handler")
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})
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// Add valid route
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apiGroup.GET("/users", func(ctx Context) error {
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return ctx.WriteString("Users")
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})
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// Verify group has notFoundHandler set
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xg := apiGroup.(*xGroup)
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if xg.notFoundHandler == nil {
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t.Error("Group should have notFoundHandler set")
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}
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}
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// TestMultipleGroupsWithNotFoundHandle tests multiple groups with different handlers
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func TestMultipleGroupsWithNotFoundHandle(t *testing.T) {
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app := New()
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// Set global handler
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app.SetNotFoundHandle(func(ctx Context) {
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ctx.WriteString("Global 404")
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})
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// Create API group
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apiGroup := app.HttpServer.Group("/api")
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apiGroup.SetNotFoundHandle(func(ctx Context) {
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ctx.WriteString(`{"code": 404, "message": "API not found"}`)
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})
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// Create Web group
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webGroup := app.HttpServer.Group("/web")
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webGroup.SetNotFoundHandle(func(ctx Context) {
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ctx.WriteString("<h1>404 - Page Not Found</h1>")
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})
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// Verify both groups have handlers
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apiXg := apiGroup.(*xGroup)
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webXg := webGroup.(*xGroup)
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if apiXg.notFoundHandler == nil {
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t.Error("API group should have notFoundHandler set")
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}
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if webXg.notFoundHandler == nil {
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t.Error("Web group should have notFoundHandler set")
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}
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}
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// TestGroupSetNotFoundHandleReturnsGroup tests that SetNotFoundHandle returns the Group for chaining
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func TestGroupSetNotFoundHandleReturnsGroup(t *testing.T) {
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app := New()
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group := app.HttpServer.Group("/api")
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result := group.SetNotFoundHandle(func(ctx Context) {
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ctx.WriteString("404")
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})
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if result == nil {
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t.Error("SetNotFoundHandle should return Group for chaining")
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}
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}
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// test helper
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type testHttpWriter http.Header
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func (ho testHttpWriter) Header() http.Header {
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return http.Header(ho)
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}
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func (ho testHttpWriter) Write(byte []byte) (int, error) {
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return len(byte), nil
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}
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func (ho testHttpWriter) WriteHeader(code int) {
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}

‎router.go‎

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// Handle 404
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// Check if request path matches any group prefix and use group's NotFoundHandler
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// Use exact prefix match or prefix + "/" to avoid false positives (e.g., /apiv2 matching /api)
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for _, g := range r.server.groups {
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if (path == g.prefix || strings.HasPrefix(path, g.prefix+"/")) && g.notFoundHandler != nil {
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for _, g := range r.server.groups {
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if strings.HasPrefix(path, g.prefix) && g.notFoundHandler != nil {
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g.notFoundHandler(ctx)

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