Share pr_review.py wait's Liveness Readings and Open the Held Poll on Its Snapshot

[ptr727]

Summary

Two duplications in scripts/pr_review.py wait are removed.

• One helper computes the liveness readings. liveness(pr, min_rounds) returns the three stop readings (head_review_done, answered_outside_review, reviewer_login_drift). main's first Q_LIVE evaluation and every live_state re-read both call it, so a reading added to one site cannot be missing from the other. The drift rationale that sat as a comment in main now lives in the helper's docstring.
• A held wait opens its poll on snapshot. It no longer makes a second, back-to-back Q_FULL read, which saves one GraphQL call per held wait. An assert narrows snapshot for the type checker. held already requires a non-None snapshot.

Tests

• The held-wait tests that count reads or queue responses now expect one Q_FULL read fewer.
• The test that modeled a push between the two Q_FULL reads now models a push before the snapshot read, and is renamed to match. Once only one read is left, that is the window that remains.
• Two tests are new. The first checks that the first stop evaluation and every poll go through the same helper. Mutating main back to computing the readings inline makes it fail. The second checks that live_state returns liveness of the same payload.

Verification

• python3 -m unittest discover -s tests: 2455 tests, OK (6 skipped).
• ruff format --check, ruff check, mypy, prose_lint.py --diff, repo_gate.py --check eol, and spec/validate.py all pass.
• local-strict-review ran twice, with each pass recorded. The first raised one introduced finding, a stale test name and docstring, which is fixed in a170f96. The second raised none.

Closes on promotion: #2731

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Pull request review waiting now applies the same checks at startup and during polling, including review completion, answers outside a formal review, and reviewer login changes.
  • When the pull request’s head has changed, the hold decision uses the current head’s review status. Rechecking a completed review with --ignore-quota-signal continues to honor the existing refusal check.

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📝 Walkthrough

Walkthrough

The change adds a shared helper for evaluating PR liveness and updates wait to use it for its initial stop check. Held-head polling reuses an existing snapshot as its first full-payload read. Tests verify helper usage and update mocked polling sequences.

Changes

PR liveness and wait polling

Layer / File(s)	Summary
Shared liveness evaluation scripts/pr_review.py, tests/test_pr_review.py	liveness evaluates head-review completion, an answer outside a formal review, and reviewer-login drift from one payload. live_state delegates these readings to it, and a test compares the results.
Wait polling and snapshot reuse scripts/pr_review.py, tests/test_pr_review.py	wait uses liveness for its initial stop reading and retains the quota-override refusal check. Held-head polling reuses the existing snapshot. Tests verify helper calls and update mocked payloads and query expectations.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~12 minutes

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Merge Risk: 🔵 Low · up to a170f

A narrow timing window can cause wait to report a result for an outdated head or check state. The change remains mergeable with owner awareness, but the held-poll read should be corrected.

Pre-merge checks | 4 | 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 58.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 24 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly identifies both main changes: sharing liveness readings in wait and using the existing snapshot for held polling.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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[Copilot]

🟡 Changes recommended

A new liveness test uses inconsistent min_rounds values and currently fails.

1 open finding

• Pass min_rounds=1 to liveness for consistent test behavior · New

What changed in this PR

This PR centralizes liveness evaluation and removes a redundant held-wait GraphQL read.

Changes:

• Adds and reuses the shared liveness helper.
• Reuses the initial snapshot for held waits.
• Updates and expands related tests.

File	Description
tests/​test_pr_review.py	Updates query expectations and adds liveness helper tests.
scripts/​pr_review.py	Centralizes liveness readings and reuses held-wait snapshots.

🧠 Review effort: Lite

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✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #2734   +/-   ##
==========================================
  Coverage           ?   59.83%           
==========================================
  Files              ?       16           
  Lines              ?     8368           
  Branches           ?        0           
==========================================
  Hits               ?     5007           
  Misses             ?     3361           
  Partials           ?        0           

Flag	Coverage Δ
python-3.13	59.83% <100.00%> (?)

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[ptr727]

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Actionable comments posted: 1

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🤖 Prompt to fix review comments

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Inline comments:
Review comments at @scripts/pr_review.py:
- Around line 5409-5410: Update the `last_full` initialization in the `held`
flow to fetch a fresh snapshot with `gql(Q_FULL, owner, repo, a.number)` instead
of reusing `snapshot`, so `final` can detect head or check transitions after the
initial full read.

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📥 Commits

Reviewing files that changed from the base of the PR and between 744d303 and a170f96.

📒 Files selected for processing (2)

• scripts/pr_review.py
• tests/test_pr_review.py

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