[9.x] Backport 18513, 18694 #18892
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[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 <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Andreas Madsen <[email protected]>
Refs: nodejs#18513 PR-URL: nodejs#18694 Refs: nodejs#18513 Reviewed-By: Ali Ijaz Sheikh <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Jeremiah Senkpiel <[email protected]> Reviewed-By: Luigi Pinca <[email protected]>
nodejs-github-bot
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async_hooks
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MylesBorins
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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 <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Andreas Madsen <[email protected]>
MylesBorins
pushed a commit
that referenced
this pull request
Feb 21, 2018
Refs: #18513 Backport-PR-URL: #18892 PR-URL: #18694 Refs: #18513 Reviewed-By: Ali Ijaz Sheikh <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Jeremiah Senkpiel <[email protected]> Reviewed-By: Luigi Pinca <[email protected]>
|
landed in 3bab4e4...664a681 |
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 <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Andreas Madsen <[email protected]>
MylesBorins
pushed a commit
that referenced
this pull request
Feb 21, 2018
Refs: #18513 Backport-PR-URL: #18892 PR-URL: #18694 Refs: #18513 Reviewed-By: Ali Ijaz Sheikh <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Jeremiah Senkpiel <[email protected]> Reviewed-By: Luigi Pinca <[email protected]>
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 <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Andreas Madsen <[email protected]>
MylesBorins
pushed a commit
that referenced
this pull request
Feb 21, 2018
Refs: #18513 Backport-PR-URL: #18892 PR-URL: #18694 Refs: #18513 Reviewed-By: Ali Ijaz Sheikh <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Jeremiah Senkpiel <[email protected]> Reviewed-By: Luigi Pinca <[email protected]>
|
There seem to be something wrong with how this got merged into v9.x-staging? |
|
cc @MylesBorins |
|
@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
make -j4 test(UNIX), orvcbuild test(Windows) passesAffected core subsystem(s)
async_hooks
CI: https://ci.nodejs.org/job/node-test-pull-request/13298/