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src,async_hooks,n-api: refactor async callback handling #14697

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src,async_hooks,n-api: refactor async callback handling #14697

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addaleax
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@addaleax addaleax commented Aug 8, 2017

  • Refactor how asynchronous code is executed from within Node
  • Merge the two almost-but-not-quite identical MakeCallback() implementations
  • Provide a public CallbackScope class for embedders in order to enable MakeCallback()-like behaviour without tying that to calling a JS function
  • Enable combining N-API async work with async-hooks
Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • commit message follows commit guidelines
Affected core subsystem(s)

/cc @nodejs/async_hooks
/cc @nodejs/n-api (Who may or may not only want to review the N-API commit; this is a breaking N-API change)

@addaleax addaleax added async_hooks Issues and PRs related to the async hooks subsystem. async_wrap c++ Issues and PRs that require attention from people who are familiar with C++. lib / src Issues and PRs related to general changes in the lib or src directory. node-api Issues and PRs related to the Node-API. semver-minor PRs that contain new features and should be released in the next minor version. labels Aug 8, 2017
@nodejs-github-bot nodejs-github-bot added c++ Issues and PRs that require attention from people who are familiar with C++. lib / src Issues and PRs related to general changes in the lib or src directory. labels Aug 8, 2017
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addaleax commented Aug 8, 2017 •
edited

CI: https://ci.nodejs.org/job/node-test-commit/11632/
CI: https://ci.nodejs.org/job/node-test-commit/11633/
CI: https://ci.nodejs.org/job/node-test-commit/11634/
CI: https://ci.nodejs.org/job/node-test-commit/11635/
CI: https://ci.nodejs.org/job/node-test-commit/11636/
CI: https://ci.nodejs.org/job/node-test-commit/11637/

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jasongin commented Aug 8, 2017

N-API parts look good.

I'm still planning to add an async context parameter to napi_make_callback() to support other async scenarios that don't use the N-API async work APIs.

If I'm understanding correctly, the change in this PR means that when the N-API async work APIs are used, during the napi_async_complete_callback invocation the current async context is already correct. Usually that callback will then invoke napi_make_callback(). So the additional async context parameter to napi_make_callback() can be optional, and the current async context used if another context is not specified.

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addaleax commented Aug 8, 2017

@jasongin This PR would mean that napi_make_callback would be unnecessary for most completion C callbacks; N-API users who use the async work API wouldn’t need to bother with any of the async stuff and could just use a plain function call.

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jasongin commented Aug 8, 2017

Oh, so the async work callback should just call napi_call_function() instead? OK, that's simpler.

Then the only need for napi_make_callback() (updated with async context parameter) will be for async code that doesn't use the async work API.

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jasongin commented Aug 8, 2017

In that case should test/addons-napi/test_async/test_async.cc be updated to call napi_call_function() instead of napi_make_callback() (in 2 places)?

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addaleax commented Aug 8, 2017

@jasongin Exactly 👍

In that case should test/addons-napi/test_async/test_async.cc be updated to call napi_call_function() instead of napi_make_callback() (in 2 places)?

Right. Done!

@addaleax addaleax mentioned this pull request Aug 10, 2017
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Rebased … maybe somebody of @AndreasMadsen @trevnorris @refack @TimothyGu @tniessen @bnoordhuis @jasnell could be reviewer (if only for the yet-unreviewed non-N-API part)?

CI: https://ci.nodejs.org/job/node-test-commit/11769/

thefourtheye
thefourtheye reviewed Aug 14, 2017
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doc/api/n-api.md Outdated
napi_async_execute_callback execute,
napi_async_complete_callback complete,
void* data,
napi_async_work* result);
```

- `[in] env`: The environment that the API is invoked under.
- `[in] async_resource_name`: An identifier for the kind of resource that is
being provided for diagnostic information expose by the `async_hooks` API.
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Nit: exposed?

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Right, fixed.

Qard pushed a commit to Qard/ayo that referenced this pull request Sep 21, 2017
@addaleax
test: add regression test for 5691
2defa68 
With `CallbackScope`, this has become possible to do properly.

Fixes: nodejs/node#5691
PR-URL: nodejs/node#14697
Reviewed-By: James M Snell <jasnell@gmail.com>
Qard pushed a commit to Qard/ayo that referenced this pull request Sep 21, 2017
@addaleax
src: move DomainEnter,DomainExit to node.cc
c015915 
PR-URL: nodejs/node#14697
Reviewed-By: Trevor Norris <trev.norris@gmail.com>
Qard pushed a commit to Qard/ayo that referenced this pull request Sep 21, 2017
@jasongin
n-api: change async resource name to napi_value
e6590ff 
PR-URL: nodejs/node#14697
Reviewed-By: Anna Henningsen <anna@addaleax.net>
@MylesBorins MylesBorins mentioned this pull request Oct 17, 2017
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2 tasks
@aruneshchandra aruneshchandra mentioned this pull request Dec 5, 2017
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@mhdawson mhdawson mentioned this pull request Mar 5, 2018
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gabrielschulhof pushed a commit to gabrielschulhof/node that referenced this pull request Apr 10, 2018
@addaleax
n-api: use AsyncResource for Work tracking
9c68371 
Enable combining N-API async work with async-hooks.

PR-URL: nodejs#14697
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jason Ginchereau <jasongin@microsoft.com>
Reviewed-By: Michael Dawson <mhdawson@ibm.com>
gabrielschulhof pushed a commit to gabrielschulhof/node that referenced this pull request Apr 16, 2018
@jasongin
n-api: change async resource name to napi_value
14dc0f8 
PR-URL: nodejs#14697
Reviewed-By: Anna Henningsen <anna@addaleax.net>
MylesBorins pushed a commit that referenced this pull request Apr 16, 2018
@addaleax @MylesBorins
n-api: use AsyncResource for Work tracking
7588eea 
Enable combining N-API async work with async-hooks.

Backport-PR-URL: #19447
PR-URL: #14697
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jason Ginchereau <jasongin@microsoft.com>
Reviewed-By: Michael Dawson <mhdawson@ibm.com>
MylesBorins pushed a commit that referenced this pull request Apr 16, 2018
@jasongin @MylesBorins
n-api: change async resource name to napi_value
156a8b6 
Backport-PR-URL: #19447
PR-URL: #14697
Reviewed-By: Anna Henningsen <anna@addaleax.net>
@MylesBorins MylesBorins mentioned this pull request Apr 16, 2018
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@parro-it parro-it mentioned this pull request May 11, 2018
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2 tasks
@simonbuchan simonbuchan mentioned this pull request Feb 27, 2019
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@jasnell jasnell jasnell approved these changes

@thefourtheye thefourtheye thefourtheye left review comments

@TimothyGu TimothyGu TimothyGu left review comments

@tniessen tniessen tniessen approved these changes

@jasongin jasongin jasongin approved these changes

@trevnorris trevnorris trevnorris requested changes

@refack refack refack approved these changes

@mhdawson mhdawson mhdawson approved these changes

@AndreasMadsen AndreasMadsen Awaiting requested review from AndreasMadsen

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