Deliver export reader errors to the requesting task - #257
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A user-defined export reader is called by TaskWrapper on behalf of the task that asked for the value. When the requester was parked on the dependency, the reader ran inside mark_completed after @waiters had been cleared. If it raised, the exception escaped into fail_task of the dependency: the completed dependency was re-marked failed and every waiter not yet resumed stayed parked, so the execution never returned. Catch the reader's error and hand it to the requester's fiber as a ResumeError, and do the same when the dependency had already completed, so both paths fail (or let the requester rescue) the same way. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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WalkthroughTaskWrapper now converts export reader exceptions into dependency failures and delivers them to requester fibers. Tests cover requesters waiting for a dependency, requesters reading after completion, and requesters that rescue the error. ChangesExport reader error handling
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~12 minutes Change: Bug fix Merge Risk: 🔵 Low · up to The change is mergeable with a bounded test follow-up: make the late-requester test wait for dependency completion so it reliably protects the intended behavior. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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No open PR bumps these yet. Proposed fix, as a separate PR: bundle update --conservative concurrent-ruby jsonLocally this moves Generated by Claude Code |
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Inline comments:
In `@test/test_export_reader_error.rb`:
- Around line 14-15: Update the test around
ExportReaderErrorFixtures::WaitingRequester.run so it waits for the prestarted
RaisingReader wrapper to complete before resolving the lazy proxy via
value.to_s. Replace the fixed timing delay with the existing completion barrier,
preserving the assertion that the run raises Taski::AggregateError.
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📒 Files selected for processing (4)
lib/taski/execution/task_wrapper.rbsig/taski.rbstest/fixtures/export_reader_error_tasks.rbtest/test_export_reader_error.rb
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LateRequester relied on a 0.3s sleep to read RaisingReader only after it completed. When the sleep lost the race it exercised the parked-waiter path instead of request_value, and the sleep slowed the suite down. Read a non-raising export of RaisingReader first. It only returns once RaisingReader has completed, so the raising export is then always read inside request_value. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Summary
A user-defined export reader that raises can hang the whole execution.
TaskWrappercalls the export reader on behalf of the task that asked for the value. When the requester is parked on the dependency, the call happens innotify_fiber_waiters_completed, insidemark_completed, after@waitershas been cleared. If the reader raises, the exception escapes intofail_taskof the dependency. The completed dependency is re-markedfailed, and every waiter not yet resumed stays parked forever.When the dependency has already completed, the same reader is called inside
request_valueinstead, and the requester fails normally. The outcome depended on timing.Fix
read_export_for_requestercatches the reader's error and hands it to the requester's fiber:notify_fiber_waiters_completed, an error becomes aResumeErrorfor that waiter. The dependency stayscompleted, and the remaining waiters are resumed as usual.request_valuegoes through the same method, so an already-completed dependency returnsDepFailed.Behaviour change
Before, when the dependency had already completed, the reader's error was raised outside the requester's
run, soruncould not rescue it. Both paths now raise it in the requester's fiber, at the point whererunreads the dependency, so it can be rescued there. Ifrundoes not rescue it, the requester fails with that error as before.Tests
test/test_export_reader_error.rbcovers three cases:rake test(859 runs) andrake standardpass locally.🤖 Generated with Claude Code
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