Goroutine Timeout

Question

type Response struct {
  data   interface{}
  status bool
}

func Find() (interface{}, bool) {
  ch := make(chan Response, 1)

  go func() {
    data, status := findCicCode()
    ch <- Response{data: data, status: status}
  }()

  select {
  case response := <-ch:
    return response.data, response.status
  case <-time.After(50 * time.Millisecond):
    return "Request timed out", false
  }
}

So, I have above function. Basically findCicCode() function call makes 3 http calls internally to external services. I have added combined timeout here for those 3 http calls. Can't put individual timeout in my case. But It still makes api calls in background if it exceeds timeout.

I am not sure if there is goroutine leak here. Is there a way to cancel those https requests if there is timeout?

Answer 1

You control cancelation of http requests with a context.Context.

// create a timeout or cancelation context to suit your requirements
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()

req, err := http.NewRequest("GET", location, nil)

// add the context to each request and they will be canceled in unison
resp, err := http.Do(req.WithContext(ctx))