timers: make timeout.refresh() a public API #20298

Fishrock123 · 2018-04-25T16:49:09Z

Originally added in bb5575a discussions such as #20261 show the usefulness of this API to the Node.js ecosystem.

cc @nodejs/timers

CI: https://ci.nodejs.org/job/node-test-pull-request/14496/

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

Note to self: Reword the commit to be timeout.refresh()

Trott · 2018-04-25T16:53:02Z

doc/api/timers.md

+
+Sets the timer's start time to the current time, and reschedules the timer to
+call its callback at the previously specified duration adjusted to the current
+time. This is useful for refreshing a timeout without allocating a new


Nit/question: Should timeout be timer in this sentence? Basically, if it refers to the same thing as timer in the previous sentence, let's pick one word and stick with it. If it refers to something different, and the definitions are not clear elsewhere in the doc, let's add them?

Trott · 2018-04-25T16:54:06Z

doc/api/timers.md

@@ -61,6 +61,21 @@ timer is active. Each of the `Timeout` objects returned by these functions
 export both `timeout.ref()` and `timeout.unref()` functions that can be used to
 control this default behavior.

+### timeout.refresh()


The methods should be arranged alphabetically, so this entry should come after timeout.ref(), not before it.

Trott

Couple of small doc nits, but LGTM otherwise.

apapirovski

LGTM. The only question is whether we want to make it refreshTimeout(timeout) in case the standards people ever want to add similar functionality? (Since it's IMO useful.)

apapirovski · 2018-04-25T16:50:30Z

lib/internal/timers.js

@@ -82,7 +80,7 @@ function Timeout(callback, after, args, isRepeat, isUnrefed) {
  initAsyncResource(this, 'Timeout');
 }

-Timeout.prototype[refreshFnSymbol] = function refresh() {
+Timeout.prototype.refresh = function refresh() {


This function doesn't need to be named. The name that V8 generates is nicer.

apapirovski · 2018-04-25T16:51:11Z

doc/api/timers.md

+time. This is useful for refreshing a timeout without allocating a new
+JavaScript object.
+
+Using this on a timer that has already called its callback **will reactivate**


I don't think this needs the emphasis.

benjamingr · 2018-04-25T16:59:47Z

This diverges further from browsers do -

I'm also not sure what purpose this serves over creating a new timeout? Can someone explain?

apapirovski · 2018-04-25T17:02:39Z

This diverges further from browsers do -

I don't really think it does. We already return an object. Adding more methods at this point doesn't make a difference. (Or a helper function like refreshTimeout.) None of this is incompatible with the browsers.

I'm also not sure what purpose this serves over creating a new timeout? Can someone explain?

Performance. clearTimeout + setTimeout back to back are slow.

benjamingr · 2018-04-25T17:17:42Z

Performance. clearTimeout + setTimeout back to back are slow.

Can't we fix that?

apapirovski · 2018-04-25T17:19:50Z

Can't we fix that?

Not really. clearTimeout could be removing the last timeout in a list, deleting that list, closing a libuv handle, then creating a timeout for the same duration, creating that list and opening a new handle.

Even ignoring that, it's still double the work to mark a timeout as disposed, free it up for GC, allocate a new timeout, enlist it, etc.

There's a reason we used to use enroll. @Fishrock123 added the private refresh method to allow us to get rid of enroll and not sacrifice performance.

Fishrock123 · 2018-04-25T17:21:19Z

I'm also not sure what purpose this serves over creating a new timeout? Can someone explain?

Less memory pressure for persistent connections with timeouts. It is without question useful - we do this internally, and the ecosystem also does it because of that. Also, this functionality is technically already available, but in a way that should be deprecated after this. (Timers.active())

(Browsers don't care for having many connections open, so this doesn't really impact them as much anyways.)

benjamingr · 2018-04-25T18:40:26Z

Thanks for clarifying.

BridgeAR · 2018-04-26T00:08:19Z

CI https://ci.nodejs.org/job/node-test-pull-request/14505/

vsemozhetbyt

I've proposed some tiny changes to the returned values system in this doc: #20310 If that PR is landed, it would be good to rebase and conform)

addaleax · 2018-04-27T18:15:37Z

A bit confused about the labels – @Fishrock123 This doesn’t target the v10.x branch?

@BridgeAR I think adding the author ready label when there’s unresolved discussion is not ideal, and is one of the reasons that led to the discussions in openjs-foundation/summit#64. It’s nice for PRs to land early, but not everybody has the response times that you and I can afford ourselves.

(@benjamingr If you do think that this doesn’t need further discussion, feel free to say so/re-add the label.)

benjamingr · 2018-05-23T11:55:47Z

We're debating on adding this to lolex in sinonjs/fake-timers#187 ^

If anyone has strong feelings about what we should do - LMK. lolex is pretty widely used (everyone using sinon and soon jest).

* addons: - Fixed a memory leak for users of `AsyncResource` and N-API. (Michael Dawson) #20668 * assert: - The `error` parameter of `assert.throws()` can be an object containing regular expressions now. (Ruben Bridgewater) #20485 * crypto: - The `authTagLength` option has been made more flexible (Tobias Nießen) #20235) #20039 * esm: - Builtin modules (e.g. `fs`) now provide named exports in ES6 modules. (Gus Caplan) #20403 * http: - Handling of `close` and `aborted` events has been made more consistent. (Robert Nagy) #20075 #20611 * module: - add --preserve-symlinks-main (David Goldstein) #19911 * timers: - `timeout.refresh()` has been added to the public API. (Jeremiah Senkpiel) #20298 * Embedder support: - Functions for creating V8 `Isolate` and `Context` objects with Node.js-specific behaviour have been added to the API. (Allen Yonghuang Wang) #20639 - Node.js `Environment`s clean up resources before exiting now. (Anna Henningsen) #19377 - Support for multi-threaded embedding has been improved. (Anna Henningsen) #20542 #20539 #20541 PR-URL: #20724

Another nail in the coffin here, farewell ye ol C-style apis. These apis caused numerous other issues that required far too many safeguards. This gets us one step closer to not having to worry about those issues anymore. Refs: nodejs#18066 Refs: nodejs#20298 PR-URL: nodejs#26760

Another nail in the coffin here, farewell ye ol C-style apis. These apis caused numerous other issues that required far too many safeguards. This gets us one step closer to not having to worry about those issues anymore. Refs: nodejs#18066 Refs: nodejs#20298 PR-URL: nodejs#26760 Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: Anatoli Papirovski <[email protected]> Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: Joyee Cheung <[email protected]>

Another nail in the coffin here, farewell ye ol C-style apis. These apis caused numerous other issues that required far too many safeguards. This gets us one step closer to not having to worry about those issues anymore. Refs: #18066 Refs: #20298 PR-URL: #26760 Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: Anatoli Papirovski <[email protected]> Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: Joyee Cheung <[email protected]>

Fishrock123 added the timers Issues and PRs related to the timers subsystem / setImmediate, setInterval, setTimeout. label Apr 25, 2018

nodejs-github-bot added the lib / src Issues and PRs related to general changes in the lib or src directory. label Apr 25, 2018

Fishrock123 mentioned this pull request Apr 25, 2018

[DEP0096] DeprecationWarning: timers.unenroll() question #20261

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Fishrock123 changed the title ~~timers: make timer.refresh() a public API~~ timers: make timeout.refresh() a public API Apr 25, 2018

addaleax approved these changes Apr 25, 2018

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addaleax added the semver-minor PRs that contain new features and should be released in the next minor version. label Apr 25, 2018

Trott reviewed Apr 25, 2018

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Trott approved these changes Apr 25, 2018

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apapirovski approved these changes Apr 25, 2018

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cjihrig approved these changes Apr 25, 2018

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Fishrock123 force-pushed the timers-public-refresh branch from aabdf30 to fb26f1d Compare April 25, 2018 17:38

ryzokuken approved these changes Apr 25, 2018

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BridgeAR requested a review from vsemozhetbyt April 26, 2018 00:05

BridgeAR added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Apr 26, 2018

vsemozhetbyt reviewed Apr 26, 2018

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trivikr approved these changes Apr 26, 2018

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Fishrock123 added the v10.x label Apr 26, 2018

jasnell approved these changes Apr 27, 2018

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addaleax removed author ready PRs that have at least one approval, no pending requests for changes, and a CI started. v10.x labels Apr 27, 2018

SimenB mentioned this pull request May 22, 2018

Support timeout.refresh in node environments sinonjs/fake-timers#187

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benjamingr mentioned this pull request Jun 1, 2018

Fixes ref() & unref() return value on NodeJS sinonjs/fake-timers#193

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Fishrock123 mentioned this pull request Mar 18, 2019

timers: deprecate active() and _unrefActive() #26760

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timers: make timeout.refresh() a public API #20298

timers: make timeout.refresh() a public API #20298

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timers: make timeout.refresh() a public API #20298

timers: make timeout.refresh() a public API #20298

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