Goroutines inside a middleware

When starting new Goroutines inside a middleware or handler, you SHOULD NOT use the original context inside it, you have to use a read-only copy.

  1. func main() {
  2.     app := iris.Default()
  4.     app.Get("/long_async", func(ctx iris.Context) {
  5.         // create a clone to be used inside the goroutine
  6.         ctxCopy := ctx.Clone()
  7.         go func() {
  8.             // simulate a long task with time.Sleep(). 5 seconds
  9.             time.Sleep(5 * time.Second)
  11.             // note that you are using the copied context "ctxCopy", IMPORTANT
  12.             log.Printf("Done! in path: %s", ctxCopy.Path())
  13.         }()
  14.     })
  16.     app.Get("/long_sync", func(ctx iris.Context) {
  17.         // simulate a long task with time.Sleep(). 5 seconds
  18.         time.Sleep(5 * time.Second)
  20.         // since we are NOT using a goroutine, we do not have to copy the context
  21.         log.Printf("Done! in path: %s", ctx.Path())
  22.     })
  24.     app.Listen(":8080")
  25. }