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fix(relay): tunnel cleanup spares a host that is reconnecting - #23683
The relay's cleanup sweep deletes a recoverable tunnel once Cloudflare reports it down past the grace period. A host that comes back registers recovery while cloudflared is still connecting, and Cloudflare reports the old down time until it connects. A sweep in that window deletes the tunnel the host is about to use, so the host has to run a full recovery provision.
Change
For a sweep call, release() returns false when the allocation's recoveryEnabledAt is later than the sweep's cutoff. A later sweep still deletes a tunnel that stays down. Client and unlink releases pass no cutoff and don't change.
The reaper passes the generation and recovery state it listed, and release() skips an allocation that moved since.
A relink that restores the recovery key bumps the allocation generation in the same transaction, link row first, as enableRecovery does.
Scope and approval
There's no issue for this. It's a focused race fix in the existing cleanup path, with no new settings. #21521 is a different recovery bug: registration gets rejected, and a maintainer pointed at the host clock.
Verification
Local PostgreSQL 18.6 with the relay's migrations, on main a11ad7424d and on this branch (also merged onto main). A script ran the relay's own sweep, release(), enableRecovery, EnvironmentLinks.upsert and unlinkEnvironmentRecord through its Drizzle Postgres binding. Only the Cloudflare tunnel and DNS clients were faked. Two tunnels are down since 10 minutes ago; one host registers recovery again just before the sweep.
Main, sweep with a 5 minute cutoff:
Cloudflare calls: get tunnel-env-reconnecting, get tunnel-env-stays-down, delete tunnel-env-stays-down, delete tunnel-env-reconnecting
This branch, same sweep, then a sweep 10 minutes later with the host still down:
Cloudflare calls: get tunnel-env-stays-down, delete tunnel-env-stays-down
Cloudflare calls: get tunnel-env-reconnecting, delete tunnel-env-reconnecting
Two sessions, overlap forced with an open transaction, no deadlocks:
A registration that commits first makes the sweep's claim fail on both. A relink restoring the recovery key does so only here; main deletes.
A registration or relink that arrives after the sweep claimed the row waits, then commits after the delete, on both.
Explicit release and unlink delete the same way on both.
Merged onto main, the four relay environment test files pass (61 tests).
Not checked:
Cloudflare's real tunnel status and timing while cloudflared connects.
The Worker cron, Hyperdrive, PlanetScale and a deployed relay stage.
…toff
A starting host registers tunnel recovery before cloudflared connects, so
Cloudflare still reports the tunnel's old inactivity time. A cleanup sweep
in that window deleted the tunnel the host was about to use. Release now
leaves a tunnel alone when its recovery registration is newer than the
sweep's inactivity cutoff.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Macroscope's review found this PR approvable — This is a localized relay cleanup race fix that preserves tunnels when recovery registered after the reaper cutoff, while leaving ordinary release paths unchanged. The existing allocation field is propagated to the cleanup check and the before/after cases have targeted regression coverage.
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No actionable comments were generated in the recent review.
Walkthrough
Managed endpoint allocations now include recovery registration timestamps. Environment link upserts increment matching allocation generations in a transaction. The reaper supplies expected recovery state and generation to release, which checks those values and the inactivity cutoff.
ManagedEndpointAllocation and its query include recoveryEnabledAt. Recovery status checks the timestamp, stored key, and linked environment key. Allocation fixtures initialize the field.
Increment allocation generation on link upsert infra/relay/src/environments/EnvironmentLinks.ts, infra/relay/src/environments/EnvironmentLinks.test.ts
upsert writes the environment link and increments the generation of matching allocations in one transaction. The test checks the matching criteria and transaction order.
Guard release with allocation expectations infra/relay/src/environments/ManagedEndpointProvider.ts, infra/relay/src/environments/ManagedEndpointProvider.test.ts, infra/relay/src/environments/ManagedEndpointReaper.ts, infra/relay/src/environments/ManagedEndpointReaper.test.ts
The reaper supplies expected recovery state and generation. release returns false if the generation differs or recovery registration occurred after the inactivity cutoff under the supplied conditions. Tests check release results and tunnel deletion.
pingdotgg/t3code#23709: This change guards release using recovery registration state. The issue’s stale-host refresh behavior remains unimplemented.
Possibly related PRs
pingdotgg/t3code#24247: That PR registers managed tunnel recovery and requests recovery; this change records and protects the corresponding state from reaper deletion.
Suggested labels:bugfix
Suggested reviewers:maria-rcks
Merge Risk: Minimal · up to 99183
This change stops the cleanup sweep from deleting a tunnel whose host has just registered recovery. Existing client and shutdown releases are unchanged. No concrete merge-blocking risk was established in the reviewed changes.
Pre-merge checks: 4
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Explanation
Title check
The title is concise, specific, and accurately describes the relay cleanup change that protects reconnecting hosts.
Linked Issues check
Check skipped because no linked issues were found for this pull request.
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The description covers the problem, change, scope and approval rationale, and verification. It explains why the focused race fix does not need a prior issue and reports specific test results and check…
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Explanation
The description covers the problem, change, scope and approval rationale, and verification. It explains why the focused race fix does not need a prior issue and reports specific test results and checks that were not performed.
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Inline comments:
Review comments at @infra/relay/src/environments/ManagedEndpointProvider.ts:
- Around line 996-1009: Update the release input and its timestamp guard so the
recovery timestamp only blocks cleanup when recovery is usable; skip that guard
when expectedRecoveryEnabled is false. In ManagedEndpointReaper, pass
candidate.owner.recoveryEnabled as expectedRecoveryEnabled to release, while
preserving existing behavior when the value is omitted.
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A relink that replaces the environment key keeps the tunnel's old
recoveryEnabledAt. The reaper already treats that owner as legacy, but
release still skipped the tunnel when the stale registration was newer
than the legacy cutoff. The reaper now passes the owner's recoveryEnabled
and release applies the guard only when it is not false.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The reaper decides recoveryEnabled when it lists tunnels, but release
reloads the allocation later. A host that registers recovery in between
bumps the generation before release reads it, so the claim still
succeeds, and the stale false skipped the timestamp guard and deleted
the tunnel the host was coming back to. The reaper now also passes the
listed recoveryEnabledAt, and release skips the guard only while the
allocation still holds that timestamp.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Pinning the recovery timestamp still let other writes since the listing,
such as a relink or a revoked link, reach release with a stale judgment.
The reaper now passes the listed allocation generation instead, and
release keeps the tunnel when the allocation changed since then. The
next sweep decides with fresh data.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Relinks and revocations update the links table and leave the allocation
generation alone, so the comment no longer cites a relink.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…ion generation
The reaper can list an allocation while its stored recovery key differs
from the link, pass recoveryEnabled=false with that generation, and
release it later without the recent-registration guard. A relink proven
by the stored key restores recovery by writing only the link row, so the
pinned generation still matched and release deleted the tunnel the
relink had just provisioned.
The link upsert now runs in a transaction that first bumps the
allocation generation when its recovery key matches the new link key.
The update takes the allocation row lock, which a claimed release holds
while it deletes the tunnel, so the link cannot change in that window.
Correction to 3768a6a: its message says the pin covers a relink or a
revoked link. It covered only allocation writes. With this commit the
reaper passes the listed allocation generation, and release keeps the
tunnel when that allocation changed since the listing, which now
includes a relink that restores the recovery key. A revocation alone
cannot restore recovery and still bumps nothing.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The relink upsert updated the allocation row and then wrote the link row.
enableRecovery takes the same two locks the other way round: its EXISTS
subquery locks the link row FOR UPDATE before its UPDATE locks the
allocation row. A same-key relink concurrent with tunnel registration or
recovery could deadlock, and Postgres would abort one request.
The upsert now writes the link first and bumps the allocation generation
second, in the same transaction. That is the link-then-allocation order
enableRecovery uses. Neither write is visible before commit, so the
listing, get and claim windows stay closed, and the bump still waits on
the allocation row lock a claimed release holds while it deletes the
tunnel.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
thanks @only21mil. your recovery timestamp guard fixes the reconnect window, and the generation pin and atomic key-restoration update protect the related races. i preserved all contributor commits, merged current main without rebasing, resolved the release conflict, and shortened the comments. no behavior or regression cases were dropped.
verification on 99183732519b91018156d1c94b15415e2d18b141:
main's release implementation fails two of the four recovery regression cases by deleting the tunnel.
blacksmith vp run check:changed: format, lint, both knip passes, relay typecheck, and 113 tests across eight affected files pass.
two independent code reviews found no issues. the earlier unusable-recovery finding is addressed by expectedRecoveryEnabled and its regression case.
unverified: a deployed cleanup sweep with real cloudflare and postgres, including database lock contention. no ui changes or new test files. ci is passing apart from the pending automatic review at the time of this comment.
partial verification only. the relay fix itself remains unverified.
inspected the diff, discussion, reviews, and commit authors. the pr is open at 99183732519b91018156d1c94b15415e2d18b141, with no pr commits by juliusmarminge or t3dotgg.
fetched github/main (c677d5fc45), created ../main, ran vp i, and started its real dev server in the background with isolated state. used repository Playwright and /usr/bin/google-chrome to pair, open connections, and add the real repository as a project. stopped main by the captured process group before starting the pr.
checked out the exact contributor head and ran vp i. started the real pr web/server with an explicit task-only T3 home. used no mocks, fixtures, replay provider, or demo data.
through the web composer, selected codex gpt-6.1-sol and sent a read-only request to run git rev-parse HEAD and git status --short. the real provider returned PR23683_PROVIDER_OK 99183732519b91018156d1c94b15415e2d18b141. the thread and response survived a browser reload.
live github check summary: 20 successful, 8 skipped, none failing or pending. no source changes, commits, pushes, or new tests were made.
short runtime transcript (pairing tokens omitted):
main: timeout 600 vp i exit 0
main: [dev-runner] serverPort=16733 webPort=8693 baseDir=/home/user/main/.t3
main: paired browser; added /home/user/t3code; connections has no saved remote environments
main: stopped captured process group 18135
pr: git rev-parse HEAD 99183732519b91018156d1c94b15415e2d18b141
pr: timeout 600 vp i exit 0
pr: [dev-runner] serverPort=13773 webPort=5733 baseDir=/home/user/t3code/.t3
pr: web -> websocket -> codex gpt-6.1-sol -> git commands -> streamed response
pr: PR23683_PROVIDER_OK 99183732519b91018156d1c94b15415e2d18b141
pr: browser reload retained completed response
these captures show the client/provider smoke check, not tunnel recovery. inspected the screenshot and trimmed recording; checked uploaded video playback and seeking in the T3 browser.
Not verified
original bug reproduction on main and the pr's changed behavior: the changed ManagedEndpointReaper runs in the separate relay cloudflare worker cron. vp run dev runs the environment host and web client, not that worker. this vm has no cloudflare, clerk, planetscale/postgres, or relay deployment credentials, and no relay .env or alchemy credentials. a production relay connection would execute production code, not this pr.
the recovery registration/reaper race, allocation selection against real postgres, same-key relink locking, eventual cleanup after the new grace expires, and explicit tunnel release/unlink. these require an isolated relay running each revision, real cloudflare tunnel/dns bindings, authenticated environment linking, and cleanup enabled. no cloud resources were changed.
native ios/android, electron, macos/windows, and remote/tunnel connectivity.
inline video rendering on github: the external mp4 image embed does not render there. the uploaded recording itself plays and seeks in the T3 browser. the screenshot renders on github; gitcafe displays the external media as links.
result: unverifiable for the requested relay behavior on this vm. local client/provider smoke checks passed; they are not proof that this fix works. no merge, close, rebase, force-push, label change, or other pr action was performed.
@maria-rcks Thanks for testing this. We ran the database half of your list on a local PostgreSQL 18 with the relay's migrations, driving the relay's own sweep, release(), recovery registration, relink and unlink on main and on this head, with only Cloudflare's tunnel and DNS clients faked. Main deletes the tunnel of a host that registered recovery after the cutoff, this head keeps it and deletes it on a later sweep if it stays down, and forced two-session overlaps showed no deadlocks; the transcript is in the description. Cloudflare's real status timing, the Worker cron and Hyperdrive still need a deployed stage.
This branch has not been deployed
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size:M30-99 changed lines (additions + deletions).vouch:unvouchedPR author is not yet trusted in the VOUCHED list.
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Problem
The relay's cleanup sweep deletes a recoverable tunnel once Cloudflare reports it down past the grace period. A host that comes back registers recovery while cloudflared is still connecting, and Cloudflare reports the old down time until it connects. A sweep in that window deletes the tunnel the host is about to use, so the host has to run a full recovery provision.
Change
release()returns false when the allocation'srecoveryEnabledAtis later than the sweep's cutoff. A later sweep still deletes a tunnel that stays down. Client and unlink releases pass no cutoff and don't change.release()skips an allocation that moved since.enableRecoverydoes.Scope and approval
There's no issue for this. It's a focused race fix in the existing cleanup path, with no new settings. #21521 is a different recovery bug: registration gets rejected, and a maintainer pointed at the host clock.
Verification
Local PostgreSQL 18.6 with the relay's migrations, on main
a11ad7424dand on this branch (also merged onto main). A script ran the relay's own sweep,release(),enableRecovery,EnvironmentLinks.upsertandunlinkEnvironmentRecordthrough its Drizzle Postgres binding. Only the Cloudflare tunnel and DNS clients were faked. Two tunnels are down since 10 minutes ago; one host registers recovery again just before the sweep.Main, sweep with a 5 minute cutoff:
This branch, same sweep, then a sweep 10 minutes later with the host still down:
Two sessions, overlap forced with an open transaction, no deadlocks:
Merged onto main, the four relay environment test files pass (61 tests).
Not checked:
Prior PRs: @t3dotgg's #9386 added the sweep; @juliusmarminge's #13565, #16250, #16649 and #22059 added legacy cleanup, refused deletes, tunnel replacement and ready-tunnel reuse. No PR has this guard.
Generated with Claude Opus 5.5 in T3 Code Nightly