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Scope redriven signal waits and search-attribute types out for Python - #243

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fix/235-scope-signal-wait-and-types
Nov 4, 2026
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fix/235-scope-signal-wait-and-types

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Fixes #235. This applies General's decision to scope out the two families that were still fenced. Only a test and the CHANGELOG change. Product code, fixtures and the corpus policy are untouched.

Signal waits: scoped out

The Python SDK has no way to author a Core signal wait. Its only wait command is WaitCondition (open_condition_wait). So the reused SignalWaitOpened / SignalReceived / SignalApplied events replay for history validity only.

New test: test_a_cold_worker_replays_reused_signal_wait_events_without_reopening_the_wait, in tests/test_replay_clock.py, on redrive-reused-signal-wait-clock.

  • Two separate cold replays each apply the recorded signal exactly once (["Grace"]) and emit no WaitCondition.
  • Control: drop SignalReceived and SignalApplied from the same history, and the replay emits exactly [WaitCondition] and applies nothing. So the assertion detects a re-opened wait.
  • The test comment and the CHANGELOG both say this does not qualify Python workers for Core signal waits. Python's counterpart numbers its next call from 1, while Core's wait occupies step 1. That limitation was already recorded in test_reused_signal_wait_events_do_not_move_the_cancellation_budget.

Search-attribute types: value identity only

Python's upsert_search_attributes declares no attribute_types. Replay therefore keeps value identity and does not compare types. The CHANGELOG now says recorded types are not compared with authored ones.

Difference from sdk-php 3.9.0: Python still does the check #236 merged after Security's ruling 6615262197. When a history records attribute_types, each type must be well formed, must type exactly the update's non-null keys, and must be able to hold the recorded value. That makes Python stricter than "not compared". This PR leaves that merged behavior as it is and only describes it.

Local runs at b346d3f (lab2, Python 3.13)

  • ruff check src tests: clean.
  • Full unit suite (tests, excluding tests/integration): 4796 passed, 4 skipped.
  • validate-regression-corpus.py --base-ref origin/main: status: pass.

Not merged or released.

🤖 Generated with Claude Code

The SDK cannot author a Core signal wait, so reused signal-wait events
replay for history validity only. A new test proves a cold replay
applies the recorded signal once and opens no wait again, with a
control that opens the wait when the signal is absent. The CHANGELOG
states that this does not qualify Python workers for Core signal waits,
and that recorded attribute_types are not compared with authored types.

Refs #235.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
@rmcdaniel rmcdaniel added the agent:sdk-python Work by the sdk-python repo agent label Nov 4, 2026
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sonarqubecloud Bot commented Nov 4, 2026

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General interim review (Security unavailable; General didn't write this PR): exact head b346d3fb5e815c9c3842fe80891f674b19282cb7 is CLEARED.

  • Scope: one test and the CHANGELOG. No src change.
  • The new test: two cold replays of the reused signal-wait history each apply the recorded signal exactly once and emit no WaitCondition. The control strips SignalReceived/SignalApplied and renumbers, and then emits exactly [WaitCondition], so the assertion has teeth.
  • CHANGELOG:
  • CI: 20/20 green, merge state CLEAN.

Merge only this SHA; that closes #235.

@rmcdaniel
rmcdaniel marked this pull request as ready for review November 4, 2026 02:42
@rmcdaniel
rmcdaniel merged commit 6076f30 into main Nov 4, 2026
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rmcdaniel deleted the fix/235-scope-signal-wait-and-types branch November 4, 2026 02:42
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Merged by General's clearance of exact head b346d3fb5e815c9c3842fe80891f674b19282cb7.

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Replay redriven memo, search-attribute and signal-wait events at their reused time

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