Can You Use Goroutines in Google App Engine Standard Environment Without Worrying About Request Lifecycle?

Using Goroutines in Google App Engine Standard Environment

In Google App Engine Standard Environment, it is important to be aware of the limitations and best practices when using goroutines.

Can Goroutines Outlive a Request?

Goroutines that continue to execute after the request has been processed are not allowed. This is because the App Engine runtime may recycle or terminate the instance handling the request, potentially interrupting the goroutine.

Safe Goroutine Usage

To ensure safe usage of goroutines, App Engine provides runtime.RunInBackground. This function allows you to execute code in a background goroutine that is independent of the request context. Here's an example:

func MyHandler(w http.ResponseWriter, r *http.Request) {

  err := runtime.RunInBackground(c, func(c appengine.Context) {
    // do something...
  })

  return // 200
}

Context-Bound Goroutines

However, goroutines that execute within the context of a request are supported. In this case, the goroutine's lifecycle is tied to the request and can be safely used for performing short-lived background tasks within the request's scope.

Limitations

It's important to note that there is a limit of 10 simultaneous background requests per instance. This prevents overutilization of resources and ensures fair sharing among concurrent requests.

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