[9.x] Backport 18513, 18694 - #18892
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The emit{Before,After} APIs in AsyncResource are problematic.
* emit{Before,After} are named to suggest that the only thing they do
is emit the before and after hooks. However, they in fact, mutate
the current execution context.
* They must be properly nested. Failure to do so by user code leads
to catastrophic (unrecoverable) exceptions. It is very easy for the
users to forget that they must be using a try/finally block around
the code that must be surrounded by these operations. Even the
example provided in the official docs makes this mistake. Failing
to use a finally can lead to a catastrophic crash if the callback
ends up throwing.
This change provides a safer `runInAsyncScope` API as an alternative
and deprecates emit{Before,After}.
PR-URL: nodejs#18513
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Andreas Madsen <amwebdk@gmail.com>
Refs: nodejs#18513 PR-URL: nodejs#18694 Refs: nodejs#18513 Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
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February 21, 2018 14:19
MylesBorins
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Feb 21, 2018
The emit{Before,After} APIs in AsyncResource are problematic.
* emit{Before,After} are named to suggest that the only thing they do
is emit the before and after hooks. However, they in fact, mutate
the current execution context.
* They must be properly nested. Failure to do so by user code leads
to catastrophic (unrecoverable) exceptions. It is very easy for the
users to forget that they must be using a try/finally block around
the code that must be surrounded by these operations. Even the
example provided in the official docs makes this mistake. Failing
to use a finally can lead to a catastrophic crash if the callback
ends up throwing.
This change provides a safer `runInAsyncScope` API as an alternative
and deprecates emit{Before,After}.
Backport-PR-URL: #18892
PR-URL: #18513
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Andreas Madsen <amwebdk@gmail.com>
MylesBorins
pushed a commit
that referenced
this pull request
Feb 21, 2018
The emit{Before,After} APIs in AsyncResource are problematic.
* emit{Before,After} are named to suggest that the only thing they do
is emit the before and after hooks. However, they in fact, mutate
the current execution context.
* They must be properly nested. Failure to do so by user code leads
to catastrophic (unrecoverable) exceptions. It is very easy for the
users to forget that they must be using a try/finally block around
the code that must be surrounded by these operations. Even the
example provided in the official docs makes this mistake. Failing
to use a finally can lead to a catastrophic crash if the callback
ends up throwing.
This change provides a safer `runInAsyncScope` API as an alternative
and deprecates emit{Before,After}.
Backport-PR-URL: #18892
PR-URL: #18513
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Andreas Madsen <amwebdk@gmail.com>
MylesBorins
pushed a commit
that referenced
this pull request
Feb 21, 2018
The emit{Before,After} APIs in AsyncResource are problematic.
* emit{Before,After} are named to suggest that the only thing they do
is emit the before and after hooks. However, they in fact, mutate
the current execution context.
* They must be properly nested. Failure to do so by user code leads
to catastrophic (unrecoverable) exceptions. It is very easy for the
users to forget that they must be using a try/finally block around
the code that must be surrounded by these operations. Even the
example provided in the official docs makes this mistake. Failing
to use a finally can lead to a catastrophic crash if the callback
ends up throwing.
This change provides a safer `runInAsyncScope` API as an alternative
and deprecates emit{Before,After}.
Backport-PR-URL: #18892
PR-URL: #18513
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Andreas Madsen <amwebdk@gmail.com>
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There seem to be something wrong with how this got merged into v9.x-staging? asyncResource.runInAsyncScope is no longer referenced and it is breaking the linter. Running Markdown linter on docs... doc/api/deprecations.md 795:1-795:112 warning Found unused definition no-unused-definitions remark-lint ⚠ 1 warning make[2]: *** [tools/.docmdlintstamp] Error 1 make[1]: *** [lint] Error 2 make: *** [test] Error 2 |
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@joyeecheung just saw this now... I thought that missing definition was from an unrelated PR. I fixed it in the other commit... please let me know if that was innacurate |
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9.x backport of #18513, #18694.
Checklist
Affected core subsystem(s)
async_hooks
CI: https://ci.nodejs.org/job/node-test-pull-request/13298/