fix(screenshot): bound the capture navigation retry - #898
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ChangesScreenshot navigation retry
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The PR bounds screenshot retry behavior to prevent CPU and log amplification while preserving retries for live pages. It is generally mergeable, but owner follow-up is still needed for the release job's unspecified token permissions and a fixed timing threshold that may cause CI-only test failures. Sequence Diagram(s)sequenceDiagram
participant captureWithNavigationRetry
participant page
participant waitUntilAuto
captureWithNavigationRetry->>page: Check transient context loss
captureWithNavigationRetry->>waitUntilAuto: Wait with remaining timeout
waitUntilAuto-->>captureWithNavigationRetry: Complete recovery or raise an error
captureWithNavigationRetry->>captureWithNavigationRetry: Recheck remaining timeout
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In @.github/workflows/main.yml:
- Line 187: Add a job-level permissions configuration to the release job
granting GITHUB_TOKEN only contents: read for checkout and git pull; keep
release publishing authentication through the existing GH_TOKEN secret and do
not grant additional write permissions.
In `@packages/screenshot/src/index.js`:
- Around line 41-42: Update the retry loop around goto.waitUntilAuto and capture
to recheck the remaining timeout budget after waitUntilAuto and after the
polling delay; when the budget is exhausted, rethrow the caught error instead of
attempting another capture, ensuring successful capture cannot return after
timeout.
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.github/workflows/main.yml.npmrcpackages/ai/package.jsonpackages/screenshot/src/index.jspackages/screenshot/test/capture-navigation-retry.jspackages/screenshot/test/white-retry.js
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lerna reads the committed ${NPM_TOKEN} line. lockfile=false
keeps the tree clean so publish does not hit EUNCOMMIT.
Co-authored-by: Cursor <cursoragent@cursor.com>
pnpm 11 ignores non-auth .npmrc keys. Keep ${NPM_TOKEN}
there for lerna; put lockfile: false in the workspace
manifest and ignore the generated lockfile.
Co-authored-by: Cursor <cursoragent@cursor.com>
pnpm 11 then resolved workspace packages from npm and install failed looking for unpublished 13.9.0. Co-authored-by: Cursor <cursoragent@cursor.com>
A closed page or session is terminal, not transient: `waitUntilAuto` resolves at once against it, so the retry loop spun with no delay for the whole capture budget (~409k iterations in 750ms in test, pegging a thread and flooding logs until the timeout expired). Bail out when the page is closed and pace each retry, so a destroyed context on a live page still retries as before. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FQGzhKLzWo14WbZ62LRdu9
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A wait that consumed the remaining budget still let one more capture through, so a slow success could return past the timeout. Recheck the deadline after the wait and rethrow instead. Teach the pdf page doubles to answer `isClosed`, as a real page does. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FQGzhKLzWo14WbZ62LRdu9
…dence The retry floor was an invented constant. Reuse `DEFAULT_POLL_MS`, the cadence this package already re-checks a page it is waiting on with, so there is one number for it instead of two. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FQGzhKLzWo14WbZ62LRdu9
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Coverage is 79.564% — fix/screenshot-retry-spin into master. No base build found for |
The readiness gate classified a closed page as a navigation reset and kept polling it every 150ms until its deadline. Same misread as the capture retry: our own teardown, treated as a transient frame swap. Name the distinction once — `isTransientContextLoss` — and let both loops ask it instead of re-deriving it from error strings. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FQGzhKLzWo14WbZ62LRdu9
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Inline comments:
In `@packages/screenshot/test/wait-for-ready.js`:
- Around line 68-74: Remove the fixed Date.now wall-clock assertion from the
waitForReady test and rely on the existing evaluations count to verify that only
one page evaluation occurs after the session closes. Keep the Session closed
rejection assertion unchanged.
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packages/screenshot/src/index.jspackages/screenshot/src/is-transient-context-loss.jspackages/screenshot/src/wait-for-ready.jspackages/screenshot/test/wait-for-ready.js
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Measured against a real browser, with the context destroyed mid-capture: the published build logs ~800k retry lines over 27s; classifying the error alone ends it in 0 lines, at the moment of teardown. Removing the sleep changes neither number. The floor was never what bounded the loop. `waitUntilAuto` is a network-idle wait: on a live page it costs at least its idle window (~500ms measured) and at most the remaining budget, so a 150ms sleep is dominated in every case a retry is warranted. It only looked load-bearing because the runaway case was a page that was gone, where the wait returns instantly — and that is now terminal. Ask puppeteer's own `TargetCloseError` as well as the page: the CDP session flips `detached` before the page's close event lands, leaving a window where every call throws while `isClosed()` still answers false. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FQGzhKLzWo14WbZ62LRdu9
The wait slept exactly the remaining budget, so the test hinged on a tie: a timer may settle a fraction before the elapsed clock reads its own deadline, which let a second capture through on CI. Overshoot instead — the assertion is about spending the budget, not about winning the tie. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FQGzhKLzWo14WbZ62LRdu9
A wall-clock bound only holds when the CI scheduler cooperates. The evaluation count says the same thing deterministically, and says it more sharply: against a budget 200 polls wide, one evaluation is the claim. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FQGzhKLzWo14WbZ62LRdu9
The retry loop spelled the same condition two ways: `remaining <= 0` before the wait, `elapsed() >= timeout` after it. A `remaining()` closure makes both sites read identically, and the wait gets the value at the moment it is handed over. The closed-page gate test built its fake by wrapping `scriptedPage`'s `evaluate` and threading an `isClosed` option no other test used. It needs one throwing evaluate; inline it and the factory goes back to taking frames alone. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017XeivF7VKq76tuKq36Wn6M
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Problem
Production logs show thousands of identical lines for a single request:
captureWithNavigationRetrytreats everyisContextDestroyederror as transient and retries in awhile (true)loop with no delay.Session closed. Most likely the page has been closed.matches that predicate, but it is terminal — the page is gone.goto.waitUntilAutoresolves immediately against a closed page (run()swallows the rejection throughpReflect), so the loop spins at full speed until the capture budget expires.Measured against the old code with a 750ms budget: 409,547 iterations. In production, with a ~28s budget, that is a pegged JS thread and a log flood per affected request — the shape behind the CPU-saturation readiness cascades.
Fix
page.isClosed()— a closed page never comes back.waitUntilAutoinstead of the full timeout.A destroyed context on a live page still retries exactly as before.
Tests
packages/screenshot/test/capture-navigation-retry.js— closed page is terminal, an immediatewaitUntilAutodoes not spin, a live page still retries, non-transient errors rethrow. The spin test fails onmaster(409k attempts) and passes here.🤖 Generated with Claude Code
https://claude.ai/code/session_01FQGzhKLzWo14WbZ62LRdu9
Note
Medium Risk
Changes retry and timeout handling for screenshot capture; a misclassification could fail live navigations early or still spin on dead pages, but this is not auth or data-handling code.
Overview
Stops
captureWithNavigationRetryfrom spinning when the page or CDP session is already gone. Production was treatingSession closedas a transient navigation and loopingwaitUntilAutountil the full capture budget expired.Retries now go through
isTransientContextLoss: context-destroyed errors still retry on a live page, butpage.isClosed()and Puppeteer’sTargetCloseErrorfail immediately. Each retry also uses the remaining timeout instead of resetting to the original budget.The same predicate is used in
waitForReadyso a closed page surfaces on the first evaluate instead of polling out the quiet window. Tests cover closed pages, detached sessions, budget exhaustion, and successful recovery after a real navigation.Reviewed by Cursor Bugbot for commit 8592f87. Bugbot is set up for automated code reviews on this repo. Configure here.
Summary by CodeRabbit
Bug Fixes
Tests