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[8.x] Backport 18513, 18694 #19517

Merged
merged 3 commits into from
Jun 28, 2018
Merged

[8.x] Backport 18513, 18694 #19517

merged 3 commits into from
Jun 28, 2018

Commits on Jun 28, 2018

  1. async_hooks: deprecate unsafe emit{Before,After} 

    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: nodejs#19517
PR-URL: nodejs#18513
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Andreas Madsen <[email protected]>
    @ofrobots
    ofrobots committed Jun 28, 2018
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  2. lib: provide proper deprecation code 

    Refs: nodejs#18513

Backport-PR-URL: nodejs#19517
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]>
    @BridgeAR @ofrobots
    BridgeAR authored and ofrobots committed Jun 28, 2018
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  3. async_hooks: remove runtime deprecation 

    As part of the backport to 8.x, this change removes the runtime
deprecation making this a docs-only deprecation for 8.x.

PR-URL: nodejs#19517
Reviewed-By: mcollina - Matteo Collina <[email protected]>
    @ofrobots
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