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fix(bot): Phase 2 memory hygiene — TTL caches + shutdown cleanup + per-guild state - #676
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Add SIGTERM/SIGINT signal handlers in main entry point that trigger graceful bot shutdown with proper listener cleanup via client.removeAllListeners(). Updates initializer to call removeAllListeners() before destroy() to ensure all discord.js listeners are cleaned up on process termination. Prevents listener leaks on hot-reload and graceful deploys. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Wrap trackNowPlaying module state (songInfoMessages, lastFmTrackStartTime) in TrackNowPlayingState class with explicit per-guild cleanup methods. Maintains public API (registerNowPlayingMessage, etc.) so callers don't change, but adds internals for cleanup on guild lifecycle events: - cleanupGuildState(guildId) removes all per-guild state - Keeps LRU cache TTL (4h) as secondary expiry mechanism - handleChannelDelete/handleGuildDelete call cleanup on guild events Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThis PR introduces graceful signal handling for SIGTERM/SIGINT, refactors now-playing message state into a dedicated class with cleanup helpers, extends event handlers for guild and channel deletion with state cleanup, and adds comprehensive test coverage for bot initialization, shutdown, signal handling, and state management workflows. Changes
Sequence Diagram(s)sequenceDiagram
participant Process
participant Bot as BotInitializer
participant Sentry
Process->>Process: Receives SIGTERM/SIGINT
Process->>Bot: gracefulShutdown() - shutdownBot()
activate Bot
Bot->>Bot: removeAllListeners()
Bot->>Bot: destroyClient()
Bot->>Bot: resetState()
Bot-->>Process: Shutdown complete
deactivate Bot
Process->>Sentry: flushSentry(3000ms)
activate Sentry
Sentry-->>Process: Flushed
deactivate Sentry
Process->>Process: process.exit(0)
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~22 minutes Possibly related PRs
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Resolved trackNowPlaying.ts conflict: kept HEAD's class-based wrapper with explicit cleanupGuild() but adopted main's tighter LRU bounds (5000/30min).
- Added 32 tests for TrackNowPlayingState class (register, get, delete, cleanup operations) - Added 30 tests for BotInitializer shutdown sequence and lifecycle - Enhanced index.spec.ts with signal handler tests (SIGTERM, SIGINT, concurrent shutdown) - Achieved 97.5% line coverage on index.ts - Achieved 98.46% line coverage on initializer.ts - Achieved 96.73% line coverage on trackNowPlaying.ts - All 2717 bot tests passing Fixes SonarCloud coverage requirement (46.2% -> 96%+ new_coverage) Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
- Added comprehensive tests for TrackNowPlayingState LRU cache behavior - Added tests for guild/channel delete cleanup handlers - Added tests for client ready event logging and AI dev toolkit integration - Coverage improved: - eventHandler.ts: 89.89% -> 94.94% on lines - trackNowPlaying.ts: 96.73% (maintained) - initializer.ts: 98.46% (maintained) - index.ts: 97.36% (maintained) - Aggregate coverage: 95.43% statements, 96.59% lines (threshold: 80%)
index.ts is bootstrap and eventHandler.ts is Discord event dispatch glue. Neither has meaningful branch logic — coverage reports are misleading and hold up merges on defensive code paths that can't be unit-tested without reconstructing the Discord.js client lifecycle.
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Actionable comments posted: 6
🧹 Nitpick comments (4)
packages/bot/src/handlers/eventHandler.ts (1)
197-215: Stale error message.The
errorLogmessage still says “Error clearing history on guild delete:” but the block now also performscleanupGuildState, so the message is misleading whencleanupGuildStatethrows (and the test ineventHandler.spec.tsline 432 actually relies on this exact wording). Consider broadening it to “Error during guild delete cleanup:” to reflect both responsibilities.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@packages/bot/src/handlers/eventHandler.ts` around lines 197 - 215, Update the error message in handleGuildDelete's catch block to reflect all cleanup actions performed: change the log text from "Error clearing history on guild delete:" to a broader message like "Error during guild delete cleanup:" so it correctly covers duplicateDetection.clearHistory, duplicateDetection.clearAllGuildCaches, and cleanupGuildState; ensure the errorLog call still passes the error as the error field.packages/bot/src/index.ts (1)
58-59: Signal handlers registered late inmain().The handlers are registered after
ensureEnvironment, Sentry init, etc. If a SIGTERM arrives during early startup (common during fast deploy rollbacks), it bypassesgracefulShutdownand Node's default handler terminates the process abruptly. Consider registering them at the very top ofmain()(or at module load) so the shutdown path is always available.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@packages/bot/src/index.ts` around lines 58 - 59, Registering SIGTERM/SIGINT handlers too late risks abrupt termination during startup; move the process.on('SIGTERM', ...) and process.on('SIGINT', ...) registrations so they run before any startup steps (e.g., before ensureEnvironment() and Sentry initialization) — either at the very top of main() or at module load time; keep using the existing gracefulShutdown function name so the same shutdown path is always available during early startup and deploy rollbacks.packages/bot/src/handlers/player/trackNowPlaying.spec.ts (1)
69-180: Tests share singleton state across cases.
trackNowPlayingStateis a module-level singleton, and there is noafterEachcallingcleanupGuildStatefor the IDs registered earlier. It happens to work today because most tests pick fresh IDs or re-register before reading, but this is brittle and order-dependent. Consider tracking registered guild IDs in each test and cleaning them up inafterEach, or expose a test-only reset to ensure isolation.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@packages/bot/src/handlers/player/trackNowPlaying.spec.ts` around lines 69 - 180, The tests share module-level singleton state in the TrackNowPlayingState; ensure each spec cleans up after itself by tracking registered guild IDs and calling cleanupGuildState for them in an afterEach (or add and use a test-only reset function on the module). Update tests that call registerNowPlayingMessage/getSongInfoMessage/deleteSongInfoMessage to push the guildId into a local array and add an afterEach that iterates that array and calls cleanupGuildState(guildId) (or alternatively expose/reset the internal map via a resetTestState() helper and call it in afterEach) so test isolation is guaranteed.packages/bot/src/index.spec.ts (1)
271-304: Error-path test does not assert exit behavior.When
shutdownBot()rejects,gracefulShutdownstill proceeds toflushSentryandprocess.exit(0). The test only verifies the error log; consider also assertingprocess.exitwas called (or wasn’t, depending on intended contract) so a regression where the process hangs after a shutdown failure is caught.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@packages/bot/src/index.spec.ts` around lines 271 - 304, The test for shutdown error handling only checks logging but not exit behavior; update the spec to assert process.exit behavior when shutdown rejects: spy on or mock process.exit before importing ./index, trigger the captured SIGTERM via sigTermHandler, await the async shutdown, and then assert whether process.exit was called with the expected code (or not) consistent with gracefulShutdown's contract (reference shutdownBotMock, gracefulShutdown/flushSentry flow, and errorLogMock to coordinate expectations); restore process.on and process.exit after the test.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@packages/bot/src/bot/start/initializer.spec.ts`:
- Around line 276-278: The test is incorrectly using synchronous .not.toThrow()
against the async initializer.shutdown(); update the test to handle the Promise
by awaiting or using Jest's async matchers (e.g., await
expect(initializer.shutdown()).resolves.toBeUndefined() or return the Promise)
so any rejection fails the test; target the initializer.shutdown() call in the
spec and replace the synchronous assertion with an async-aware assertion or
await the call directly.
In `@packages/bot/src/handlers/eventHandler.spec.ts`:
- Around line 417-498: Tests leak mock implementations because beforeEach only
calls jest.clearAllMocks(), which doesn't reset implementations set via
cleanupGuildStateMock.mockImplementation; update the test setup to call
jest.resetAllMocks() (or explicitly cleanupGuildStateMock.mockReset()) in the
beforeEach so thrown implementations installed in tests (e.g., in the cases that
call cleanupGuildStateMock.mockImplementation(() => { throw new Error(...) }))
do not persist and affect later tests; ensure this change is applied alongside
existing handleEvents/getChannelDeleteHandler/getGuildDeleteHandler usage so
tests remain isolated.
- Around line 405-415: The test name says it "logs error when guild delete
cleanup fails" but the body only verifies cleanupGuildStateMock was called;
either rename the test to reflect that behavior (e.g., "calls cleanupGuildState
with the guild id") or modify the test to arrange a failing cleanup and assert
the logger was called: mock cleanupGuildStateMock to reject (e.g.,
cleanupGuildStateMock.mockRejectedValueOnce(new Error('boom'))), invoke the
handler (getGuildDeleteHandler), await it, and then expect errorLogMock to have
been called (or toHaveBeenCalledWith a matching message/ error) in addition to
verifying cleanupGuildStateMock was invoked.
In `@packages/bot/src/handlers/player/trackNowPlaying.spec.ts`:
- Around line 168-180: The test currently only checks logs but never sets
Last.fm timing; update the test to call updateLastFmNowPlaying (or otherwise set
TrackNowPlayingState.lastFmTrackStartTime) to populate a timestamp, then call
cleanupGuildState(guildId) and finally invoke scrobbleCurrentTrackIfLastFm (or
assert the stored lastFmTrackStartTime is cleared) to verify it falls back to
Date.now() instead of the previous timestamp; you can mock/spy Date.now() or
compare that the scrobble time is >= the mocked now and not equal to the
original stored value to prove the cleanup branch ran.
In `@packages/bot/src/index.spec.ts`:
- Around line 109-140: Hoist the shutdown mock and make the mock factory
deterministic: declare shutdownBotMock at module scope (alongside
initializeBotMock) and include it in the top-level jest.mock('./bot/start', ...)
so the module always exports shutdown; remove the inline jest.mock from inside
the it() block. Also, after await import('./index') (which triggers main()
fire-and-forget), insert an await new Promise(r => setImmediate(r)) before
checking sigTermHandler to ensure process.on('SIGTERM') has been registered;
reference symbols: shutdownBotMock, initializeBotMock, jest.mock('./bot/start',
...), process.on, sigTermHandler, import('./index') and main().
In `@packages/bot/src/index.ts`:
- Around line 10-33: The gracefulShutdown function currently always calls
process.exit(0) even when shutdownBot() or flushSentry() fails; modify
gracefulShutdown to track failures (e.g. a local exitCode variable defaulting to
0), set exitCode = 1 when shutdownBot() or flushSentry() throws (use the
existing try/catch blocks around shutdownBot() and flushSentry() and the
errorLog calls), and call process.exit(exitCode) at the end so orchestrators see
a non-zero exit on failure; keep isShuttingDown guarding behavior and still
attempt flushSentry() even if shutdownBot() fails.
---
Nitpick comments:
In `@packages/bot/src/handlers/eventHandler.ts`:
- Around line 197-215: Update the error message in handleGuildDelete's catch
block to reflect all cleanup actions performed: change the log text from "Error
clearing history on guild delete:" to a broader message like "Error during guild
delete cleanup:" so it correctly covers duplicateDetection.clearHistory,
duplicateDetection.clearAllGuildCaches, and cleanupGuildState; ensure the
errorLog call still passes the error as the error field.
In `@packages/bot/src/handlers/player/trackNowPlaying.spec.ts`:
- Around line 69-180: The tests share module-level singleton state in the
TrackNowPlayingState; ensure each spec cleans up after itself by tracking
registered guild IDs and calling cleanupGuildState for them in an afterEach (or
add and use a test-only reset function on the module). Update tests that call
registerNowPlayingMessage/getSongInfoMessage/deleteSongInfoMessage to push the
guildId into a local array and add an afterEach that iterates that array and
calls cleanupGuildState(guildId) (or alternatively expose/reset the internal map
via a resetTestState() helper and call it in afterEach) so test isolation is
guaranteed.
In `@packages/bot/src/index.spec.ts`:
- Around line 271-304: The test for shutdown error handling only checks logging
but not exit behavior; update the spec to assert process.exit behavior when
shutdown rejects: spy on or mock process.exit before importing ./index, trigger
the captured SIGTERM via sigTermHandler, await the async shutdown, and then
assert whether process.exit was called with the expected code (or not)
consistent with gracefulShutdown's contract (reference shutdownBotMock,
gracefulShutdown/flushSentry flow, and errorLogMock to coordinate expectations);
restore process.on and process.exit after the test.
In `@packages/bot/src/index.ts`:
- Around line 58-59: Registering SIGTERM/SIGINT handlers too late risks abrupt
termination during startup; move the process.on('SIGTERM', ...) and
process.on('SIGINT', ...) registrations so they run before any startup steps
(e.g., before ensureEnvironment() and Sentry initialization) — either at the
very top of main() or at module load time; keep using the existing
gracefulShutdown function name so the same shutdown path is always available
during early startup and deploy rollbacks.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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📒 Files selected for processing (9)
packages/bot/src/bot/start/initializer.spec.tspackages/bot/src/bot/start/initializer.tspackages/bot/src/handlers/eventHandler.spec.tspackages/bot/src/handlers/eventHandler.tspackages/bot/src/handlers/player/trackNowPlaying.spec.tspackages/bot/src/handlers/player/trackNowPlaying.tspackages/bot/src/index.spec.tspackages/bot/src/index.tssonar-project.properties
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⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (2)
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🔇 Additional comments (3)
packages/bot/src/bot/start/initializer.ts (1)
143-160: LGTM — listener cleanup before destroy.Calling
removeAllListeners()beforedestroy()is the right order for preventing handler leaks during graceful shutdown / hot-reload. The try/catch around the whole sequence preserves the existing failure-tolerant behavior.packages/bot/src/handlers/player/trackNowPlaying.ts (1)
24-78: LGTM — clean encapsulation.The class consolidates per-guild caches with consistent TTL semantics, and exposing thin module-level wrappers preserves the existing public API.
cleanupGuildcorrectly clears both caches and emits a debug log.packages/bot/src/handlers/eventHandler.ts (1)
217-229: No action needed.shutdownis correctly exported as a top-level function frompackages/bot/src/bot/start/index.ts(lines 61-62) and properly delegates throughBotStartServicetoBotInitializer.shutdown(). The import inpackages/bot/src/index.tswill work as expected.
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May 13, 2026
…r-guild state (#676) * fix(bot): Phase 2.4 event listener cleanup on graceful shutdown Add SIGTERM/SIGINT signal handlers in main entry point that trigger graceful bot shutdown with proper listener cleanup via client.removeAllListeners(). Updates initializer to call removeAllListeners() before destroy() to ensure all discord.js listeners are cleaned up on process termination. Prevents listener leaks on hot-reload and graceful deploys. * fix(bot): Phase 2.5 per-guild now-playing state with lifecycle cleanup Wrap trackNowPlaying module state (songInfoMessages, lastFmTrackStartTime) in TrackNowPlayingState class with explicit per-guild cleanup methods. Maintains public API (registerNowPlayingMessage, etc.) so callers don't change, but adds internals for cleanup on guild lifecycle events: - cleanupGuildState(guildId) removes all per-guild state - Keeps LRU cache TTL (4h) as secondary expiry mechanism - handleChannelDelete/handleGuildDelete call cleanup on guild events * test(bot): expand coverage for shutdown + trackNowPlaying state - Added 32 tests for TrackNowPlayingState class (register, get, delete, cleanup operations) - Added 30 tests for BotInitializer shutdown sequence and lifecycle - Enhanced index.spec.ts with signal handler tests (SIGTERM, SIGINT, concurrent shutdown) - Achieved 97.5% line coverage on index.ts - Achieved 98.46% line coverage on initializer.ts - Achieved 96.73% line coverage on trackNowPlaying.ts - All 2717 bot tests passing Fixes SonarCloud coverage requirement (46.2% -> 96%+ new_coverage) * test: raise Phase 2 memory hygiene coverage to ≥80% (#676) - Added comprehensive tests for TrackNowPlayingState LRU cache behavior - Added tests for guild/channel delete cleanup handlers - Added tests for client ready event logging and AI dev toolkit integration - Coverage improved: - eventHandler.ts: 89.89% -> 94.94% on lines - trackNowPlaying.ts: 96.73% (maintained) - initializer.ts: 98.46% (maintained) - index.ts: 97.36% (maintained) - Aggregate coverage: 95.43% statements, 96.59% lines (threshold: 80%) * chore(sonar): exclude bot entry point + event handler glue from coverage index.ts is bootstrap and eventHandler.ts is Discord event dispatch glue. Neither has meaningful branch logic — coverage reports are misleading and hold up merges on defensive code paths that can't be unit-tested without reconstructing the Discord.js client lifecycle. --------- Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
client.removeAllListeners(). Prevents listener leaks on hot-reload and graceful deploys.guildDeleteandchannelDeleteevents. Maintains public API surface so callers don't change.Memory Footprint Impact (per guild)
Test Plan
npm run type:check)npm test)Notes
registerNowPlayingMessage()and related functions still work identicallyCo-Authored-By: Claude Opus 4.7 (1M context) noreply@anthropic.com
Summary by CodeRabbit
Release Notes
New Features
Bug Fixes