Accessing size of request queue in plumber

General
1

Is there any method to access the # of pending requests from a plumber endpoint, or from a hook?

2

I do not believe this can be done.

plumber returns a httpuv server. If the main R process is working on something, httpuv will not be notified of any pending requests while the main R process is working.

3

Thanks, that is what i was afraid of. What about in between, after it has processed one request and before it routes the next request?

4

When version 0.5.0 comes out, you might be able to things with async support...

Ex:

  • request comes in
  • increment the counter
  • have the body of the long running function be computed using future
    • future will not access to the live counter, only the counter value it knows about at the start of execution.
  • In the pre-serializer step, decrement the counter

But for now, I do not see a way.

5

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