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fix(proxies): keep the running copy when a redeploy's tunnel cannot start - #267
Redeploying a proxied copy could leave the proxy with no copy at all. deployProxied removed the old earner and tunnel, then started the new tunnel. If the new tunnel could not start, for example because its image was not available locally or the proxy did not answer within the ready timeout, the old copy was already gone. Only changing the order of the calls does not work, because the tunnel name is fixed and Docker refuses a second container with that name.
The new tunnel starts as cashpilot-tunnel-<slug>-p<id>-next beside the running copy. sidecarCreate gives it the final hostname from the start. If it never proves an exit, it is removed and the running copy is untouched.
Once it is ready, the old pair goes (earner first) and the tunnel is renamed to its final name. Both steps run under proxiedSwap, a lock the status read also takes, so a status read cannot start an earner that is being removed or read a half-swapped pair. If the swap fails, the staged tunnel is removed.
The status read never reports a staged tunnel. It sweeps one older than staleTestTunnel, which means the deploy that staged it died, since a staged tunnel holds the proxy login.
A leftover under the staged name is replaced only if it carries this copy's labels. Otherwise the deploy refuses and leaves it alone.
tunnelDocker gains rename (ContainerRename on the live daemon).
Tests (all fail on main):
TestDeployStartsTheEarnerOnlyAfterTheTunnelIsReady: the order is now staged create, copy, start, rename, then the earner.
From the review of the web fix to the thread on GeiserX/CashPilot#576 at app/proxy_tunnel.py:344, whose code Desktop #245 ported.
Review follow-ups: deploys of one copy run one at a time under a per-copy lock, so a second deploy never takes the first one's staged tunnel for a leftover (TestTwoDeploysOfOneCopyTakeTurns). Without the lock it failed 4 of 20 runs. TestAFailedPromotionRemovesTheStagedTunnel covers a failed rename.
Summary by CodeRabbit
Bug Fixes
Proxied-copy redeployments now keep the existing working copy running until a replacement tunnel is ready and validated.
If a replacement cannot be started or validated, the current copy remains available instead of being left offline.
Successful redeployments switch to the replacement only after it is ready, reducing interruptions during updates.
…tart
deployProxied removed the old pair before the new tunnel started, so a tunnel
that failed to start left no copy. The new tunnel now starts as <name>-next
beside the running copy; once it has an exit, the old pair goes and the tunnel
is renamed, under a lock the status read shares. The status read skips staged
tunnels and sweeps stale ones. Mirrors GeiserX/CashPilot#632.
Reviewing files that changed from the base of the PR and between dbb90d1 and 2916bb5.
Files selected for processing: 2
internal/runtime/proxied.go
internal/runtime/proxied_test.go
Walkthrough
Proxied-copy redeployment now starts and validates a staged replacement tunnel before removing the existing earner and tunnel. Status reads omit staged tunnels, and the sweeper removes staged tunnels that are at least five minutes old.
Changes: Proxied redeployment
Layer / File(s)
Summary
Staged tunnel naming and promotion support internal/runtime/proxied.go, internal/runtime/proxied_test.go
The runtime adds a staged tunnel name and hostname handling, and supports Docker container renames. It also adds locks for deployment and status coordination. The fake Docker daemon supports rename behavior and failure injection.
Replacement deployment and validation internal/runtime/proxied.go, internal/runtime/proxied_test.go, CHANGELOG.md
deployProxied starts and validates the staged tunnel before removing the existing pair, then renames the tunnel and creates the earner. Tests cover failed validation, promotion order and hostname, rename failure, and concurrent deployments. The changelog records the redeployment fix.
Staged tunnel status and cleanup internal/runtime/proxied.go, internal/runtime/proxied_test.go
Status reads omit staged tunnels, and the sweeper removes staged tunnels that are at least five minutes old. Tests cover status filtering, cleanup, and protection of staged-name containers owned by another service.
Replacement startup failures preserve the running copy, but promotion failures can still stop it until another deployment succeeds. Concurrent processes and long-running deployments also risk losing their staged tunnel. Resolve these failure paths before merging unless explicitly accepted.
Pre-merge checks: 4 · 1
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Docstring coverage is 70.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documenta…
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Title check
The title names the main change: a redeploy whose tunnel fails to start now keeps the running copy. The changeset stages a replacement tunnel beside the running pair, and the old earner and tunnel are…
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The title names the main change: a redeploy whose tunnel fails to start now keeps the running copy. The changeset stages a replacement tunnel beside the running pair, and the old earner and tunnel are removed only after the new tunnel is ready. The title matches the CHANGELOG entry, the proxied.go deployment logic, and the new tests.
Full details: Docstring Coverage
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Docstring coverage is 70.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 10 functions across 2 files. (1 skipped: 1 unsupported.)
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Write docstrings for the functions missing them to satisfy the coverage threshold.
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❌ Patch coverage is 84.09091% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.24%. Comparing base (4b5c332) to head (2916bb5).
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Actionable comments posted: 3
Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix all issues
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Inline comments:
Review comments at @internal/runtime/proxied.go:
- Around line 834-843: Update the redeploy flow around removeProxied and
d.rename so a failed promotion preserves or restores the previous running pair
before cleanup removes the staged sidecar. Use the existing state and operations
to ensure the old copy remains available, and retain the proxiedSwap lock while
changing the pair.
- Around line 816-827: Serialize deployments for the same copy across processes
sharing the daemon, acquiring coordination before the staged-tunnel inspection
and holding it through readiness and promotion so another deployment cannot
remove an active tunnel. Update the deployment flow around tunnelName,
d.inspect, and removeQuietly to use the project’s established cross-process
coordination mechanism; preserve the ownership check and establish that the
coordination is shared across processes using the daemon.
- Around line 1071-1077: Update the staged-tunnel cleanup loop around d.list and
removeQuietly to coordinate with the deploy using its existing lock, then
recheck that each tunnel is still stale and eligible for removal while holding
that lock. Preserve cleanup of genuinely stale tunnels while protecting tunnels
actively awaiting a swap.
---
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Reviewing files that changed from the base of the PR and between 4b5c332 and dbb90d1.
Files selected for processing: 3
CHANGELOG.md
internal/runtime/proxied.go
internal/runtime/proxied_test.go
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A deploy removed any staged tunnel of ours as a leftover, and the status read
swept any older than five minutes. A second app on the same Docker host, or a
deploy still waiting for the swap, could lose its tunnel after the old pair was
gone. A deploy now refuses a staged tunnel younger than the sweep age, and the
sweep skips one whose copy is being deployed in this app.
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Redeploying a proxied copy could leave the proxy with no copy at all.
deployProxiedremoved the old earner and tunnel, then started the new tunnel. If the new tunnel could not start, for example because its image was not available locally or the proxy did not answer within the ready timeout, the old copy was already gone. Only changing the order of the calls does not work, because the tunnel name is fixed and Docker refuses a second container with that name.The fix, the same as the web worker's in GeiserX/CashPilot#632:
cashpilot-tunnel-<slug>-p<id>-nextbeside the running copy.sidecarCreategives it the final hostname from the start. If it never proves an exit, it is removed and the running copy is untouched.proxiedSwap, a lock the status read also takes, so a status read cannot start an earner that is being removed or read a half-swapped pair. If the swap fails, the staged tunnel is removed.staleTestTunnel, which means the deploy that staged it died, since a staged tunnel holds the proxy login.tunnelDockergainsrename(ContainerRenameon the live daemon).Tests (all fail on main):
TestDeployStartsTheEarnerOnlyAfterTheTunnelIsReady: the order is now staged create, copy, start, rename, then the earner.TestARedeployWhoseTunnelCannotStartKeepsTheRunningCopyTestARedeployPromotesTheStagedTunnelAfterTheOldPairGoes: the old pair goes before the rename, and the hostname is the final one.TestAStagedTunnelIsNeverReportedAndAStrangerIsNeverRemovedFrom the review of the web fix to the thread on GeiserX/CashPilot#576 at app/proxy_tunnel.py:344, whose code Desktop #245 ported.
Review follow-ups: deploys of one copy run one at a time under a per-copy lock, so a second deploy never takes the first one's staged tunnel for a leftover (
TestTwoDeploysOfOneCopyTakeTurns). Without the lock it failed 4 of 20 runs.TestAFailedPromotionRemovesTheStagedTunnelcovers a failed rename.Summary by CodeRabbit