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stream: simpler Readable async iterator #34035

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stream: simpler Readable async iterator #34035

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@ronag ronag commented Jun 23, 2020 •
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Simplifies async iteration for Readable using async generator.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • documentation is changed or added
  • commit message follows commit guidelines

@ronag ronag added the stream Issues and PRs related to the stream subsystem. label Jun 23, 2020
@ronag ronag force-pushed the readable-async-iterator branch 2 times, most recently from a754d9b to bdded9e Compare June 23, 2020 21:12
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CI: https://ci.nodejs.org/job/node-test-pull-request/32045/

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ronag commented Jun 23, 2020

Might be relevant for #30298

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ronag commented Jun 23, 2020

Some really strange CI failures... will investigate

This was referenced Jun 24, 2020
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benjamingr reviewed Jun 25, 2020
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@ronag ronag force-pushed the readable-async-iterator branch 11 times, most recently from 647a0ab to 0bbbed1 Compare June 25, 2020 13:19
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@ronag ronag force-pushed the readable-async-iterator branch 5 times, most recently from a111d8d to 8944c59 Compare June 25, 2020 13:37
@ronag ronag requested a review from mcollina June 25, 2020 13:42
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ronag commented Jun 25, 2020 •
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@mcollina PTAL when you have time. No hurry.

There are 3 tests that I have commented out which fail. These failures seem to be related to difference between how an async iterator from an async generator i.e. async function* works and how our custom async iterator works. I would guess that the behavior from async generator should be more spec compliant? Or maybe it's a timing issue? Either way probably a semver-major.

  1. the async iterator prototype test.
  2. next promises are not rejected, but instead resolved

ronag added a commit that referenced this pull request Jul 17, 2020
@ronag
stream: simpler and faster Readable async iterator
08e8997 
Reimplement as an async generator instead of a custom
iterator class.

PR-URL: #34035
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
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ronag commented Jul 17, 2020

Landed in 08e8997

@ronag ronag closed this Jul 17, 2020
@ronag ronag mentioned this pull request Jul 17, 2020
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cjihrig pushed a commit that referenced this pull request Jul 23, 2020
@ronag @cjihrig
stream: simpler and faster Readable async iterator
f4a6e6f 
Reimplement as an async generator instead of a custom
iterator class.

PR-URL: #34035
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
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ronag commented Aug 1, 2020

@nodejs/tsc @mcollina @benjamingr I defensively marked this as semver-major. However, it would be nice to land this on v14 as it might become the basis for future semver-minor changes.

@mcollina mcollina added the tsc-agenda Issues and PRs to discuss during the meetings of the TSC. label Aug 2, 2020
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mcollina commented Aug 2, 2020

I concur with @ronag. We might want to land this on v14 before it goes to LTS.

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ronag commented Aug 8, 2020

@Trott This didn't make it to the tsc agenda this week? I guess it's because the PR is closed?

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mcollina commented Aug 8, 2020

@ronag can you please open an issue or a PR so it gets there?

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ronag commented Aug 8, 2020

Done

@ronag ronag mentioned this pull request Aug 23, 2020
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@BethGriggs BethGriggs mentioned this pull request Sep 1, 2020
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richardlau pushed a commit that referenced this pull request Sep 7, 2020
@ronag @richardlau
stream: simpler and faster Readable async iterator
6a296a4 
Reimplement as an async generator instead of a custom
iterator class.

Backport-PR-URL: #34887
PR-URL: #34035
Refs: #34680
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
@richardlau richardlau mentioned this pull request Sep 7, 2020
Merged
4 tasks
richardlau pushed a commit that referenced this pull request Sep 7, 2020
@ronag @richardlau
stream: simpler and faster Readable async iterator
4bb4007 
Reimplement as an async generator instead of a custom
iterator class.

Backport-PR-URL: #34887
PR-URL: #34035
Refs: #34680
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
richardlau added a commit that referenced this pull request Sep 7, 2020
@richardlau
2020-09-08, Version 14.10.0 (Current)
ce5f587 
Notable changes:

- buffer: also alias BigUInt methods (Anna Henningsen)
  #34960
- crypto: add randomInt function (Oli Lalonde)
  #34600
- perf_hooks: add idleTime and event loop util (Trevor Norris)
  #34938
- stream: simpler and faster Readable async iterator (Robert Nagy)
  #34035
- stream: save error in state (Robert Nagy)
  #34103

PR-URL: #35023
richardlau added a commit that referenced this pull request Sep 8, 2020
@richardlau
2020-09-08, Version 14.10.0 (Current)
b5a47ca 
Notable changes:

- buffer: also alias BigUInt methods (Anna Henningsen)
  #34960
- crypto: add randomInt function (Oli Lalonde)
  #34600
- perf_hooks: add idleTime and event loop util (Trevor Norris)
  #34938
- stream: simpler and faster Readable async iterator (Robert Nagy)
  #34035
- stream: save error in state (Robert Nagy)
  #34103

PR-URL: #35023

Conflicts:
	src/node_version.h
MylesBorins pushed a commit that referenced this pull request Oct 15, 2020
@ronag @MylesBorins
stream: multiple stream backports
573410f 
includes:

* stream: simpler and faster Readable async iterator
* stream: don't destroy on async iterator success
* stream: async iterator stop read if destroyed

PR-URL: #34887
Refs: #34035
Refs: #35122
Refs: #35640
Refs: #34680
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
joesepi pushed a commit to joesepi/node that referenced this pull request Jan 8, 2021
@richardlau @joesepi
2020-09-08, Version 14.10.0 (Current)
8af5ac6 
Notable changes:

- buffer: also alias BigUInt methods (Anna Henningsen)
  nodejs#34960
- crypto: add randomInt function (Oli Lalonde)
  nodejs#34600
- perf_hooks: add idleTime and event loop util (Trevor Norris)
  nodejs#34938
- stream: simpler and faster Readable async iterator (Robert Nagy)
  nodejs#34035
- stream: save error in state (Robert Nagy)
  nodejs#34103

PR-URL: nodejs#35023

Conflicts:
	src/node_version.h
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@mcollina mcollina mcollina approved these changes

@benjamingr benjamingr benjamingr approved these changes

@jasnell jasnell jasnell approved these changes

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