Stream + async await

[Jan-Ivar Bruaroey]

Because a promise is not a control surface of the asynchronous action 
fulfilling it; confuses owner with consumer. 
https://stackoverflow.com/a/41417429/918910

.: Jan-Ivar :.

On 7/31/17 7:35 AM, T.J. Crowder wrote:
> Related: https://esdiscuss.org/topic/how-about-awaiting-arrays 
> (particularly the discussion of `await.race`), since effectively 
> you're doing a race between a timeout and each chunk. Also relevant is 
> the former work on cancelling promises, now withdrawn. (Can anyone 
> point me at *why* it was withdrawn?)
>
> -- T.J. Crowder
>
> On Mon, Jul 31, 2017 at 6:10 AM, kai zhu <kaizhu256 at gmail.com 
> <mailto:kaizhu256 at gmail.com>> wrote:
>
>     the timeout handler will not work as advertised, e.g. what if io /
>     db issues causes a network stream to intermittently respond in
>     intervals far greater than 30000ms or not at all?
>
>     > On Jul 31, 2017, at 7:26 AM, James Browning
>     <thejamesernator at gmail.com <mailto:thejamesernator at gmail.com>> wrote:
>     >
>     > It'll look something like this:
>     >
>     > ```javascript
>     >
>     > async function consumeReadableStream(stream) {
>     >     const start = Date.now()
>     >     for await (const chunk of stream) {
>     >
>     >        /* Do whatever you want with the chunk here e,g, await other
>     > async tasks with chunks
>     >            send them off to wherever, etc
>     >        */
>     >
>     >         if (Date.now() - start > 30000) {
>     >             throw new Error('30000 ms timeout')
>     >        }
>     >    }
>     >    /* Instead of callbackOnce the returned promise from this
>     function
>     > itself can be used */
>     > }
>     >
>     > ```
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-- 
.: Jan-Ivar :.
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