Make realAsyncZone run microtasks and timers in the correct zone.
#164982
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Current implementation runs timers and microtask callbacks in the root zone. That assumes that the top-level `scheduleMicrotask` or `Timer` constructors have been used, which have so far wrapped the callback with `runCallbackGuarded` before calling the zone implementation. That means that doing `zone.scheduleMicrotask` directly would not ensure that the microtask was run in the correct zone. If a `run` handler throws, it wouldn't be caught. This change makes the `realAsyncZone` do whatever the root zone would do if its `ZoneDelegate` got called with the intended zone and arguments. That should be consistent with the current behavior, and be compatible with changes to the platform `Zone` behavior.
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Does seem that there are no golden issues. PTAL either this or #162731 to get the Dart SDK CL unblocked. |
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Current implementation runs timers and microtask callbacks in the root zone. That assumes that the top-level
scheduleMicrotaskorTimerconstructors have been used, which have so far wrapped the callback withrunCallbackGuardedbefore calling the zone implementation.That means that doing
zone.scheduleMicrotaskdirectly would not ensure that the microtask was run in the correct zone. If arunhandler throws, it wouldn't be caught.This change makes the
realAsyncZonedo whatever the root zone would do if itsZoneDelegategot called with the intended zone and arguments. That should be consistent with the current behavior, and be compatible with incoming bug-fixes to the platformZonebehavior.Prepares Flutter for landing https://dart-review.googlesource.com/c/sdk/+/406961
which is currently blocked (so this indirectly blocks fixing the dart-lang/sdk#59913).
Adds test to check that the callbacks do run in the expected zone. Otherwise all existing tests should keep running, and they should keep doing so when the Dart CL lands. Currently that CL only breaks one test, the
dev/automated_tests/test_smoke_test/fail_test_on_exception_after_test.darttest which threw the error-after-test in the root zone instead of the test zone. This change fixes that.(This is a copy of #162731 merged to head, to see if the goldens change is spurious. It seems so.)