👀 Views: 1776 💬 Answers: 1 📅 Created: 2025-06-14

go gin context middleware

I've hit a wall trying to I'm using Go version 1.19 and the Gin framework to build a REST API... I have a middleware that sets a timeout for each request using the `context` package, but I'm running into an scenario where my handler is not respecting the context deadline, leading to `context deadline exceeded` errors, even when I believe the request should complete in time. Here's a simplified version of my middleware: ```go package middleware import ( "context" "net/http" "time" ) func TimeoutMiddleware(timeout time.Duration) gin.HandlerFunc { return func(c *gin.Context) { ctx, cancel := context.WithTimeout(c.Request.Context(), timeout) defer cancel() c.Request = c.Request.WithContext(ctx) c.Next() } } ``` I attached this middleware in my router setup like this: ```go r := gin.New() r.Use(middleware.TimeoutMiddleware(2 * time.Second)) r.GET("/longtask", func(c *gin.Context) { time.Sleep(3 * time.Second) // Simulating a long task c.JSON(http.StatusOK, gin.H{"status": "completed"}) }) r.Run() ``` In this case, I expect the API to return a timeout behavior, but I would like to handle it gracefully rather than having the server crash. The `longtask` handler is supposed to sleep for 3 seconds, which exceeds the timeout duration I set in the middleware. However, I don't see the expected behavior of the context timeout triggering. I also tried wrapping the `c.Next()` in a `select` statement to see if the timeout was being reached: ```go select { case <-ctx.Done(): // Handle the timeout gracefully here c.JSON(http.StatusRequestTimeout, gin.H{"behavior": "request timed out"}) return case c.Next(): } ``` Unfortunately, this doesn't seem to have the desired effect either. I still get the `context deadline exceeded` behavior, but it doesn't trigger my custom timeout response. How can I properly handle this situation and ensure that the context timeout works as intended while providing a user-friendly behavior message? This is part of a larger CLI tool I'm building. Is there a better approach?