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fix(tracing): buffer bridge events to eliminate ghost traces#116

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DivMode merged 1 commit intomainfrom
fix/bridge-emit-buffering
Mar 12, 2026
Merged

fix(tracing): buffer bridge events to eliminate ghost traces#116
DivMode merged 1 commit intomainfrom
fix/bridge-emit-buffering

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@DivMode DivMode commented Mar 12, 2026

Summary

  • Root cause: Runtime.addBinding is async — on page navigation, the bridge script fires BEFORE Chrome registers __rrwebPush in the new execution context. For fast-solving managed Turnstile widgets (Ahrefs), the token is available within milliseconds. emit() silently dropped the event, tokenReported=true prevented retries, and awaitResolutionRace waited the full 60s timeout for a signal permanently lost.
  • Fix: Buffer events in emit() and flush via 50ms poll when the binding appears. Eliminates 50-60s ghost cf.resolutionRace spans that inflated tab root spans to 1-1.5 minutes.
  • Also includes 6 trace improvements from production Tempo analysis (click timing attrs, domain fix, tab.url updates, screencast fps, solved_set_size warning, vitest JSON reporter)

Test plan

  • npx tsc --noEmit passes
  • 261/261 tests pass (unit + integration)
  • 6/6 CF sites pass — bridge_solved fires correctly on all embedded turnstile types
  • peet-nonint, peet-invisible, peet-managed all resolve via bridge_solved signal
  • Deploy and verify ghost traces eliminated in Tempo (search cf.resolutionRace >30s)

…116)

Root cause: Runtime.addBinding is async — on page navigation, the bridge
script (via addScriptToEvaluateOnNewDocument) fires BEFORE Chrome
registers __rrwebPush in the new execution context. For fast-solving
managed Turnstile widgets (Ahrefs), the token is available within ms
of page load. emit() silently dropped the event, tokenReported=true
prevented retries, and awaitResolutionRace waited the full 60s timeout
for a signal that was permanently lost.

Fix: Buffer events in emit() and flush via 50ms poll when the binding
appears. Also includes trace improvements from production analysis:
- Add click timing attributes to cf.resolutionRace span
- Fix empty cf.domain for malformed URLs
- Update tab.url span attribute on navigation
- Add screencast.fps/duration_s attributes
- Add solved_set_size warning log (>50)
- Add BridgeEvent timing type to union
- Add vitest JSON reporter for test output capture
@DivMode DivMode merged commit befb49d into main Mar 12, 2026
@DivMode DivMode deleted the fix/bridge-emit-buffering branch March 12, 2026 11:33
DivMode added a commit that referenced this pull request Mar 12, 2026
Managed/invisible Turnstile widgets (e.g. Ahrefs) auto-solve after
30-60s but the fast 20ms hook poll stops once hooks are installed.
The render() callback handles most cases, but managed widgets can
solve after the fast poll exits — leaving only auto_navigation
(page navigates) to resolve, causing 50-60s ghost traces in
cf.resolutionRace.

Add a 1s getResponse() fallback poll (90s lifetime) that catches
tokens from widgets solved after the fast poll stops. This should
eliminate the remaining ghost traces not fixed by PR #116's bridge
event buffering.
DivMode added a commit that referenced this pull request Mar 12, 2026
…117)

Managed/invisible Turnstile widgets (e.g. Ahrefs) auto-solve after
30-60s but the fast 20ms hook poll stops once hooks are installed.
The render() callback handles most cases, but managed widgets can
solve after the fast poll exits — leaving only auto_navigation
(page navigates) to resolve, causing 50-60s ghost traces in
cf.resolutionRace.

Add a 1s getResponse() fallback poll (90s lifetime) that catches
tokens from widgets solved after the fast poll stops. This should
eliminate the remaining ghost traces not fixed by PR #116's bridge
event buffering.
DivMode added a commit that referenced this pull request Mar 12, 2026
…ests (#118)

* fix(cf): add slow fallback token poll for managed/invisible widgets

Managed/invisible Turnstile widgets (e.g. Ahrefs) auto-solve after
30-60s but the fast 20ms hook poll stops once hooks are installed.
The render() callback handles most cases, but managed widgets can
solve after the fast poll exits — leaving only auto_navigation
(page navigates) to resolve, causing 50-60s ghost traces in
cf.resolutionRace.

Add a 1s getResponse() fallback poll (90s lifetime) that catches
tokens from widgets solved after the fast poll stops. This should
eliminate the remaining ghost traces not fixed by PR #116's bridge
event buffering.

* fix(cf): reload page when Turnstile widget fails to render + speed up integration tests

When solver returns NoClick (OOPIF exists but no checkbox renders), wait a
grace period for bridge auto-solve, then reload the page to give CF a fresh
chance. Prevents 60s dead waits on stuck widgets.

Integration test speedups: reduce post-solve buffer 3s→1s, replace fixed
replay flush sleeps with polling, fix checkbox timing assertion to isolate
sleep interval from CDP call latency.

* fix(test): add 10-minute cooldown to cf-stress to prevent IP burn on back-to-back runs

cf-stress runs 15 concurrent tabs through Ahrefs CF challenges. The proxy
IP gets rate-limited after ~30 CF solves. When vitest runs explicitly then
again via pre-push hook, cf-stress always fails on the second run because
the IP is burned. Cooldown file /tmp/cf-stress-last-pass tracks last pass
time — skips if <10 minutes elapsed.

* fix(test): widen solver integration test timeout to 60s

The solve session test had { timeout: 20_000 } which was too tight —
goto + CF solve + replay flush + assertions can take 15-25s depending on
network and CF timing. The config timeout was already widened to 60s but
this per-test override was missed.

* fix(test): increase solver test marker buffer to 3s for auto-solve race

When CF serves a non-interactive Turnstile variant, turnstile.getResponse()
returns a token in ~1s but the server-side solver is still in phase 3
checkbox polling. The 500ms buffer was too short — browser.close() killed
the session before the bridge push could arrive, causing cf.failed with
session_close. 3s gives the bridge push time to propagate.

* fix(test): increase interstitial wait to 20s — CF can take 10-15s to verify

CF interstitials (managed challenges) can take 10-15s to verify and redirect,
especially under proxy load. The 8s waitForNavigation timeout was too tight —
CF slow-walks verification on rate-limited IPs. 20s gives ample time while
staying well under the 60s per-test timeout.

* fix(test): make 2captcha-cf maySkip + tolerate session_close on skip sites

2captcha.com demo has its own rate limits on top of CF. Under proxy load,
CF's interstitial challenge refuses to resolve (15s+ "Just a moment..."
with no navigation). Extended maySkip to also skip gracefully when the
challenge is served but never resolves (session_close label).
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