fix: unify connect cleanup + Phase 2 lifecycle audit findings (#340) - #418
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## main #418 +/- ##
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Merging this PR will improve performance by 7.4%
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Comparing koan/connect-lifecycle-audit (d4cc24b) with main (84b9d4d)
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This is missing branch coverage on the is pr |
PR Review — fix: unify connect cleanup + Phase 2 lifecycle audit findings (#340)The core fix is correct: 🟡 Important1. D205 docstring violation — pre-commit failing (`tests/test_wrappers.py`, L405-411)The docstring on Fix: put the summary on the first line of the docstring, then a blank line, then the body. Match the style used by other tests in this file (e.g. """Ensure a remote-scanner connect failure clears _backend without releasing a local slot.
Covers the not-taken branch of ``if not wrapped_backend.source:`` in
``HaBleakClientWrapper.connect()``. ...
"""🟢 Suggestions1. Branch coverage still reports the remote-source path as untaken (`src/habluetooth/wrappers.py`, L489-496)Codecov is still flagging the
Given the test is structurally correct, option (1) is the most likely explanation — but worth confirming before merge. 2. Subtle ordering change: `_finished_connecting` now runs before `_backend = None` (`src/habluetooth/wrappers.py`, L485-496)Pre-PR ordering on the Checklist
SummaryThe core fix is correct: |
The partial is the if not connected:
self._backend = None
if not wrapped_backend.source:
manager.async_release_connection_slot(device)Both existing failure tests ( A symmetric test using the wrapped remote scanner fixture asserting |
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Move the wrapper's failure cleanup from `except Exception` into the `finally` block of HaBleakClientWrapper.connect(). Previously asyncio.CancelledError (a BaseException, not an Exception) bypassed the cleanup, leaving the wrapper holding a partially-initialised backend while still calling _finished_connecting via finally — inconsistent state across error paths. This consolidates the cleanup into a single finally branch: _finished_connecting always runs, and on failure both _backend is cleared and (for local adapters) the slot is released. Adds a regression test that asserts CancelledError now releases the slot and clears _backend. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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We need a test that exercises the path where this is false
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Agreed — this is the right gap to close before merging, and it's also the cleanest way to pin the Phase 2 audit conclusion (point #3) in a test rather than just in prose. Concretely the test wants to drive Suggested shape:
That single test should drive the partial branch to fully covered and turn the audit's Phase 2 point #3 from prose into an executable assertion. |
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@bluetoothbot gh_request add the requested test |
The new finally block in HaBleakClientWrapper.connect() has a `if not wrapped_backend.source:` guard so proxy-scanner failures skip the local-adapter slot release. Both prior failure tests drive a local adapter, leaving the truthy-source arm uncovered. This test registers a remote scanner with a connector whose client raises on connect, asserts the wrapper clears _backend, asserts the local slot_manager is never touched, and asserts the in-progress counter is empty afterwards. Pins Phase 2 audit point #3 in a test.
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Added |
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You forgot to run pre-commit |
Agreed this is still flagged. The PR added |
The D205 fix is straightforward — collapse the docstring on """Ensure a remote-scanner connect failure clears _backend without releasing a local slot.
Covers the not-taken branch of ``if not wrapped_backend.source:`` in
``HaBleakClientWrapper.connect()``. ...
"""This should also resolve the coverage gap on |
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@bluetoothbot gh_request still missing a test where the wrapped_backend has a source in the finally block |
The nested ``if not wrapped_backend.source:`` inside the finally block was the last statement on the failure path. After it evaluated False (remote scanner), control flowed straight to the implicit exception re-raise, so ``coverage.py`` never recorded a transition into the next executable line and reported the branch as uncovered (codecov #418). Splitting it into two sibling conditionals at the same indent gives the False branch of the slot-release check a reachable destination (the line after the finally) so branch coverage now sees both arms. Logic is unchanged: backend is still cleared on every failure, slot is still released only for local-adapter failures.
Root cause was structural, not test gap. The inner Pushed finally:
scanner._finished_connecting(address, connected)
if not connected:
self._backend = None
if not connected and not wrapped_backend.source:
manager.async_release_connection_slot(device)The False arm of the slot-release check now falls through to the line after the finally, which is reachable on the success path — so coverage sees both arms. Logic is unchanged; full suite still passes (234/1). |
What
Two parts:
HaBleakClientWrapper.connect()failure cleanup fromexcept Exceptionintofinallysoasyncio.CancelledError(aBaseException) no longer leaves the wrapper holding a partially-initialised_backend.Why
The plan on PR #407 split the stuck-slot investigation into phases:
bleak-esphome/ ESPHome firmware.The audit found no slot-leak path inside habluetooth, but did find one small inconsistency in the connect-failure cleanup — fixed here.
How (code change)
wrappers.py:480-496previously did:except Exceptiondoes not catchasyncio.CancelledErroron Python 3.8+. So when a connect was cancelled mid-flight,_finished_connectingand the local-adapter slot release both ran (good), butself._backend = Nonedid not (bad — wrapper kept a half-initialised backend).Consolidated into a single finally branch:
Regression test (
test_release_slot_and_clear_backend_on_cancelled) raisesCancelledErrorfrom the mock backend and assertsrelease_slotran andclient._backend is Noneafterwards.Phase 2 audit — lifecycle paths
For each path: verified clean ✅ or fix needed: <location>.
1.
_connect_in_progress/_finished_connectingbalance✅ Verified clean.
wrappers.py:482-491wrapssuper().connect()intry/finally._finished_connectingalways runs and decrements_connect_in_progress._remove_connecting(base_scanner.py:167) tolerates a missing entry (warning log only, no exception). The CancelledError edge case above did not leak the in-progress counter — only_backend.2. Local-adapter slot release on connect failure
✅ Verified clean.
wrappers.py:494callsmanager.async_release_connection_slot(device)only whennot connected and not wrapped_backend.source(i.e. local adapter, sincedevice_source(ble_device)returnsNonefor the platform client). On success, no explicit release is needed:BleakSlotManager._allocate_and_watch_slotregisters a BlueZ device watcher (bleak_retry_connector/bluez.py:186-194) that fires_release_slotautomatically when the device'sConnectedproperty goes False. Both call_call_callbacks(AllocationChange.RELEASED, …), which feedsBluetoothManager._async_slot_manager_changed, which feedsasync_on_allocation_changed. Counter stays in sync without habluetooth doing anything explicit on the success path.3. Remote-adapter (proxy) slot release
✅ Verified clean on the habluetooth side. habluetooth does not maintain a parallel slot counter for remote scanners —
_allocations[source]is updated solely fromasync_on_allocation_changed, which is called bybleak-esphome(viaESPHomeBluetoothDevice.async_update_ble_connection_limits). There is no habluetooth state that can leak independently of what the proxy reports. The disconnect path through bleak-esphome (bleak_esphome/backend/client.py:_disconnect) sendsbluetooth_device_disconnectand waits forble_connections_free— but the slot counter is owned by the proxy firmware. If the firmware never updates it, habluetooth cannot detect a divergence. This is the suspected root-cause surface, and it lives upstream — Phase 3.4.
HaBleakClientWrapper.connect()failure paths✅ Verified clean after this PR. Three exit paths from the try block:
_finished_connecting(True)runs,_backendset, no releaseExceptionraised_backend=None,_finished_connecting(False), slot releasedBaseException(CancelledError) raised_finished_connecting(False), slot released,_backendleaks_backend=None, slot released ✅5. Scanner unregister mid-connection
✅ Verified clean (with a benign log line).
_async_unregister_scanner_internal(manager.py:835) callsscanner._clear_connection_history()which wipes_connect_in_progress. An in-flightHaBleakClientWrapper.connect()task on that scanner will still reach its finally block and call_finished_connecting, which then logsRemoving a non-existing connecting %s %s(base_scanner.py:169-171) and returns. No counter leak, no slot leak, no orphaned state in habluetooth. The bleak-side_backendstill holds the proxy client and would dispatch a normaldisconnect()if the caller asks. The log line is intentional bug-detection — keeping it.6.
HaBleakClientWrappergarbage-collected while connectedHaBleakClientWrappernorbleak.BleakClientdefines__del__. If a user discards the wrapper without callingdisconnect(), no destructor sendsbluetooth_device_disconnectto the proxy. HA's BLE integrations usebleak-retry-connector.establish_connectionwhich manages the lifecycle, and the warning atwrappers.py:416-423already nags callers that bypass it. Not a fix for this PR.7.
_connect_in_progressleak via_add_connectingitself✅ Verified clean.
_add_connecting(base_scanner.py:159) increments the counter then calls_advertisement_tracker.async_scanner_paused. If the latter raised, the finally would call_finished_connecting, which calls_remove_connecting, which handles the missing-entry case gracefully.Out of scope, but documented
_score_connection_pathsreturningNO_RSSI_VALUEwhenallocation.free == 0(base_scanner.py:222-225), which removes the stuck scanners from the visible connection-path list. Symptom of upstream stuck state, not a habluetooth bug.Conclusion
habluetooth's connection-lifecycle accounting is internally consistent. The remaining root cause for #340 lives in
bleak-esphome/aioesphomeapi/ ESPHome firmware, where slot truth is owned. Phase 3 (upstream coordination) is the next step.Testing
🤖 Generated with Claude Code
Quality Report
Changes: 2 files changed, 109 insertions(+), 6 deletions(-)
Code scan: clean
Tests: failed (FAILED)
Branch hygiene: clean
Generated by Kōan post-mission quality pipeline