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events: add max listener warning for EventTarget #36001

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events: add max listener warning for EventTarget #36001

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jasnell
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@jasnell jasnell commented Nov 6, 2020

Fixes: #35990

Signed-off-by: James M Snell jasnell@gmail.com

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

@jasnell jasnell added events Issues and PRs related to the events subsystem / EventEmitter. eventtarget Issues and PRs related to the EventTarget implementation. semver-minor PRs that contain new features and should be released in the next minor version. request-ci Add this label to start a Jenkins CI on a PR. labels Nov 6, 2020
benjamingr
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Looks good - except the static on EventTarget.

Domenic pointed me towards https://heycam.github.io/webidl/#create-an-interface-object that does not allow adding additional properties.

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@jasnell jasnell force-pushed the max-listeners-for-eventtarget branch from 34e87e4 to 53dc04d Compare November 6, 2020 17:10
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@jasnell would it be possible to make it static on events rather than a symbol on EventTarget so there are no additional methods tacked onto the EventTarget instance? (Even behind a symbol)

I think the DOM people and spec feel very strongly that once there are things added it's no longer a spec compliant EventTarget.

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jasnell commented Nov 6, 2020

Possible, yes, ideal, no? It would end up needing to be something like...

events.setEventTargetMaxListeners(eventTarget, 5);

Because the limit should be settable per EventTarget instance to match the behavior on EventEmitter and NodeEventTarget

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jasnell commented Nov 6, 2020

Ok, this is the approach I just implemented:

const events = require('events')
const et1 = new EventTarget();
const et2 = new EventTarget();

events.setEventTargetMaxListeners(15); // Set the default for all EventTargets

events.setEventTargetMaxListeners(15, et1); // Set the max for et1
events.setEventTargetMaxListeners(15, et1, et2); // Set the max for et1 and et2

It's not pretty but it works.

@jasnell jasnell force-pushed the max-listeners-for-eventtarget branch from 53dc04d to abb7409 Compare November 6, 2020 18:54
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@jasnell jasnell force-pushed the max-listeners-for-eventtarget branch from abb7409 to 1f87c08 Compare November 6, 2020 19:16
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CI: https://ci.nodejs.org/job/node-test-pull-request/34139/

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jasnell commented Nov 12, 2020

The answer may very well be "yes" but I want to make sure that's a conscious choice.

I wouldn't see why not to be honest. They are functionally consistent with each other.

@jasnell jasnell added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Nov 12, 2020
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doc/api/events.md
-->

* `n` {number} A non-negative number. The maximum number of listeners per
`EventTarget` event.
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Suggested change
`EventTarget` event.
`EventTarget` or `EventEmitter`.

Trott
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doc/api/events.md
`EventTarget` event.
* `...eventsTargets` {EventTarget[]|EventEmitter[]} Zero or more {EventTarget}
or {EventEmitter} instances. If none are specified, `n` is set as the default
max for all newly created {EventTarget} and {EventEmitter} objects.
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Suggested change
max for all newly created {EventTarget} and {EventEmitter} objects.
maximum for all newly-created {EventTarget} and {EventEmitter} objects.

@benjamingr benjamingr added the commit-queue Add this label to land a pull request using GitHub Actions. label Nov 16, 2020
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Landed in cd31340...dc79f3f

nodejs-github-bot pushed a commit that referenced this pull request Nov 16, 2020
@jasnell @nodejs-github-bot
events: add max listener warning for EventTarget
dc79f3f 
Signed-off-by: James M Snell <jasnell@gmail.com>

PR-URL: #36001
Fixes: #35990
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
@github-actions github-actions bot closed this Nov 16, 2020
codebytere pushed a commit that referenced this pull request Nov 22, 2020
@jasnell @codebytere
events: add max listener warning for EventTarget
9ce9b01 
Signed-off-by: James M Snell <jasnell@gmail.com>

PR-URL: #36001
Fixes: #35990
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
codebytere added a commit that referenced this pull request Nov 22, 2020
@codebytere
2020-11-24, Version 15.3.0 (Current)
ac213a0 
Notable changes:

dns:
  * (SEMVER-MINOR) add a cancel() method to the promise Resolver (Szymon Marczak) #33099
events:
  * (SEMVER-MINOR) add max listener warning for EventTarget (James M Snell) #36001
http:
  * (SEMVER-MINOR) add support for abortsignal to http.request (Benjamin Gruenbaum) #36048
http2:
  * (SEMVER-MINOR) allow setting the local window size of a session (Yongsheng Zhang) #35978
lib:
  * (SEMVER-MINOR) add throws option to fs.f/l/statSync (Andrew Casey) #33716
path:
  * (SEMVER-MINOR) add `path/posix` and `path/win32` alias modules (ExE Boss) #34962
readline:
  * (SEMVER-MINOR) add getPrompt to get the current prompt (Mattias Runge-Broberg) #33675
src:
  * (SEMVER-MINOR) add loop idle time in diagnostic report (Gireesh Punathil) #35940
util:
  * (SEMVER-MINOR) add `util/types` alias module (ExE Boss) #34055

PR-URL: TODO
@codebytere codebytere mentioned this pull request Nov 22, 2020
Merged
codebytere added a commit that referenced this pull request Nov 24, 2020
@codebytere
2020-11-24, Version 15.3.0 (Current)
636a649 
Notable changes:

dns:
  * (SEMVER-MINOR) add a cancel() method to the promise Resolver (Szymon Marczak) #33099
events:
  * (SEMVER-MINOR) add max listener warning for EventTarget (James M Snell) #36001
http:
  * (SEMVER-MINOR) add support for abortsignal to http.request (Benjamin Gruenbaum) #36048
http2:
  * (SEMVER-MINOR) allow setting the local window size of a session (Yongsheng Zhang) #35978
lib:
  * (SEMVER-MINOR) add throws option to fs.f/l/statSync (Andrew Casey) #33716
path:
  * (SEMVER-MINOR) add `path/posix` and `path/win32` alias modules (ExE Boss) #34962
readline:
  * (SEMVER-MINOR) add getPrompt to get the current prompt (Mattias Runge-Broberg) #33675
src:
  * (SEMVER-MINOR) add loop idle time in diagnostic report (Gireesh Punathil) #35940
util:
  * (SEMVER-MINOR) add `util/types` alias module (ExE Boss) #34055

PR-URL: TODO
codebytere added a commit that referenced this pull request Nov 24, 2020
@codebytere
2020-11-24, Version 15.3.0 (Current)
63e7dc1 
Notable changes:

dns:
  * (SEMVER-MINOR) add a cancel() method to the promise Resolver (Szymon Marczak) #33099
events:
  * (SEMVER-MINOR) add max listener warning for EventTarget (James M Snell) #36001
http:
  * (SEMVER-MINOR) add support for abortsignal to http.request (Benjamin Gruenbaum) #36048
http2:
  * (SEMVER-MINOR) allow setting the local window size of a session (Yongsheng Zhang) #35978
lib:
  * (SEMVER-MINOR) add throws option to fs.f/l/statSync (Andrew Casey) #33716
path:
  * (SEMVER-MINOR) add `path/posix` and `path/win32` alias modules (ExE Boss) #34962
readline:
  * (SEMVER-MINOR) add getPrompt to get the current prompt (Mattias Runge-Broberg) #33675
src:
  * (SEMVER-MINOR) add loop idle time in diagnostic report (Gireesh Punathil) #35940
util:
  * (SEMVER-MINOR) add `util/types` alias module (ExE Boss) #34055

PR-URL: #36232
codebytere added a commit that referenced this pull request Nov 24, 2020
@codebytere
2020-11-24, Version 15.3.0 (Current)
7b5b8ef 
Notable changes:

dns:
  * (SEMVER-MINOR) add a cancel() method to the promise Resolver (Szymon Marczak) #33099
events:
  * (SEMVER-MINOR) add max listener warning for EventTarget (James M Snell) #36001
http:
  * (SEMVER-MINOR) add support for abortsignal to http.request (Benjamin Gruenbaum) #36048
http2:
  * (SEMVER-MINOR) allow setting the local window size of a session (Yongsheng Zhang) #35978
lib:
  * (SEMVER-MINOR) add throws option to fs.f/l/statSync (Andrew Casey) #33716
path:
  * (SEMVER-MINOR) add `path/posix` and `path/win32` alias modules (ExE Boss) #34962
readline:
  * (SEMVER-MINOR) add getPrompt to get the current prompt (Mattias Runge-Broberg) #33675
src:
  * (SEMVER-MINOR) add loop idle time in diagnostic report (Gireesh Punathil) #35940
util:
  * (SEMVER-MINOR) add `util/types` alias module (ExE Boss) #34055

PR-URL: #36232
targos pushed a commit to targos/node that referenced this pull request Apr 24, 2021
@jasnell @targos
events: add max listener warning for EventTarget
c63d539 
Signed-off-by: James M Snell <jasnell@gmail.com>

PR-URL: nodejs#36001
Fixes: nodejs#35990
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
@targos targos mentioned this pull request Apr 24, 2021
Closed
targos pushed a commit to targos/node that referenced this pull request Apr 26, 2021
@jasnell @targos
events: add max listener warning for EventTarget
89d15fe 
Signed-off-by: James M Snell <jasnell@gmail.com>

PR-URL: nodejs#36001
Fixes: nodejs#35990
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
targos pushed a commit to targos/node that referenced this pull request Apr 30, 2021
@jasnell @targos
events: add max listener warning for EventTarget
6b3a21c 
Signed-off-by: James M Snell <jasnell@gmail.com>

PR-URL: nodejs#36001
Fixes: nodejs#35990
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
targos pushed a commit that referenced this pull request Apr 30, 2021
@jasnell @targos
events: add max listener warning for EventTarget
3006302 
Signed-off-by: James M Snell <jasnell@gmail.com>

PR-URL: #36001
Backport-PR-URL: #38386
Fixes: #35990
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
@targos targos added backported-to-v14.x and removed author ready PRs that have at least one approval, no pending requests for changes, and a CI started. backport-open-v14.x labels Apr 30, 2021
@danielleadams danielleadams mentioned this pull request May 3, 2021
Merged
@ejose19 ejose19 mentioned this pull request Jan 15, 2022
Merged
7 tasks
@mcollina mcollina mentioned this pull request Sep 4, 2024
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Warn on EventTarget maxListeners > THRESHOLD
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