middleware/timeout: implement timeout middleware

framework/context.go

@@ -97,6 +97,12 @@ func (ctx *Context) Value(key any) any {
 	return ctx.BaseContext().Value(key)
 }
 
+// Next runs the next function in the function chain
+func (ctx *Context) Next() error {
+	// TODO
+	return nil
+}
+
 // }}}
 // {{{ Implements request functions
 

framework/middleware/timeout.go

@@ -1,11 +1,48 @@
 package middleware
 
 import (
+	"context"
+	"log"
+	"net/http"
 	"time"
 
 	"git.vinchent.xyz/vinchent/go-web/framework"
 )
 
 func Timeout(d time.Duration) framework.ControllerHandler {
-	return func(c *framework.Context) error { return nil }
+	return func(c *framework.Context) error {
+		finish := make(chan struct{}, 1)
+		panicChan := make(chan interface{}, 1)
+
+		durationCtx, cancel := context.WithTimeout(c.BaseContext(), d)
+		defer cancel()
+
+		go func() {
+			// Handle panic
+			defer func() {
+				if p := recover(); p != nil {
+					panicChan <- p
+				}
+			}()
+
+			// Run the next middleware or the business logic
+			c.Next()
+
+			finish <- struct{}{}
+		}()
+
+		select {
+		case p := <-panicChan:
+			// panic
+			log.Println(p)
+			c.GetResponseWriter().WriteHeader(http.StatusInternalServerError)
+		case <-finish:
+			// finish normally
+			log.Println("finish")
+		case <-durationCtx.Done():
+			c.SetHasTimeout()
+			c.GetResponseWriter().Write([]byte("time out"))
+		}
+		return nil
+	}
 }