fix: tear down brokers by sessionId on SessionEnd to avoid orphaned worktree brokers (#380)#381
fix: tear down brokers by sessionId on SessionEnd to avoid orphaned worktree brokers (#380)#381hongsu wants to merge 12 commits into
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브로커 생성 시 CODEX_COMPANION_SESSION_ID를 broker.json에 sessionId 필드로 기록. resolveSessionId(options)는 options.sessionId → options.env → process.env → null 순서로 해소. 기존 세션 재사용 경로(early-return)는 변경 없음. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Compare the hook entrypoint and argv path after resolving realpaths so Node's import.meta.url canonicalization does not bypass direct execution when CLAUDE_PLUGIN_ROOT is a symlink. Add a runtime regression test that invokes SessionStart through a symlinked plugin root and verifies the exported session environment. Constraint: Node resolves imported module URLs to real paths while argv preserves the invoked symlink path. Rejected: Raw URL pathname comparison | fails for symlinked plugin installations. Confidence: high Scope-risk: narrow Directive: Keep hook direct-execution checks symlink-aware; SessionEnd cleanup depends on main() running from installed hook commands. Tested: node --test tests/runtime.test.mjs tests/broker-lifecycle.test.mjs; npm test Not-tested: npm run build fails before this change because generated app-server types do not match current source types.
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Serialize broker owner updates with a per-state-file lock so concurrent SessionEnd hooks cannot leave an already-ended owner behind. Ensure broker teardown still runs when job cleanup throws, and bound broker shutdown RPC waits so unresponsive endpoints cannot hang SessionEnd. Add regressions for each path.
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A co-owner that dies without SessionEnd (SIGKILL, OOM, crash) stays in sessionIds forever, so the last graceful SessionEnd early-returns and the broker is orphaned even though every owning session is gone. Record a best-effort session pid (the SessionStart hook's parent, exported as CODEX_COMPANION_SESSION_PID) alongside each owner. teardownBrokersForSession now prunes co-owners whose recorded pid no longer exists before deciding whether the broker must stay up, and handleSessionEnd's early-return only respects owners that are still live. Owners without a recorded pid keep the previous assume-alive behavior, so legacy broker.json files are unaffected. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
fs.realpathSync throws ENOENT when process.argv[1] does not resolve to a real path (deleted script, loader indirection), which would crash the hook module at import time. Treat an unresolvable path as not-executed-directly. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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The reuse path probed readiness before acquiring the state-file lock and then fell back to the pre-lock snapshot (loadBrokerSession(cwd) ?? existing). When the last owner's SessionEnd won the lock first, the fallback resurrected the just-shut-down broker: the caller got a dead endpoint and broker.json was rewritten to point at it. Reuse now trusts only the locked re-read: if broker.json is gone or points at a different endpoint, the attempt is retried once (a live replacement broker is reused) and otherwise falls through to spawning a fresh broker. The spawn path also re-reads the current state instead of tearing down the stale pre-lock snapshot. Regression-locked with a deterministic lock-hold test (torn-down broker is not resurrected; a fresh broker is spawned) plus a live-replacement reuse test. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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…urrency Revert the session-PID owner-liveness mechanism (recording process.ppid at SessionStart and pruning owners whose pid is gone). Under the packaged shell-form SessionStart hook, node's process.ppid is the ephemeral sh that wraps the command, not the Claude session, so the recorded pid is dead almost immediately. That made every shared-broker co-owner look dead, so any single session exit tore down a broker still in use by its siblings — regressing the shared-ownership guarantee. The dead-co-owner-orphan case it targeted is the abnormal-exit concern already deferred to the broker idle-timeout (openai#108). Also fix two concurrency defects surfaced while reviewing that code: - teardownBrokersForSession aborted the entire state-root scan when any single broker.json.lock could not be acquired within the timeout, so a fresh lock held by an unrelated/stuck hook left the ending session's own brokers uncollected. Lock timeouts are now caught per entry and the scan continues. - ensureBrokerSession's fresh-broker spawn+persist ran outside the state-file lock, so two racing sessions could each spawn a broker and clobber broker.json, orphaning one broker with no record to clean it later. Spawn is now serialized under the lock (adopt a live broker written by a racing session, else spawn), with an unlocked best-effort fallback only when the lock cannot be acquired. - The state-file lock now stamps an owner token so a stale reclaim by another waiter cannot have its lock directory deleted by the original holder's release path. Tests: drop the pid-injection tests; add a locked-entry-skip teardown test and a dead-record fresh-spawn test. Broker suite 19/19; no new failures in the full suite (the 9 remaining failures are pre-existing environmental cases present at the merge base). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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| return; | ||
| } | ||
| const remainingOwners = owners.filter((owner) => owner !== sessionId); | ||
| if (remainingOwners.length > 0) { |
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When a shared broker's other owner has already disappeared without running SessionEnd (for example, the Claude session was SIGKILLed), this branch treats that stale owner as live, rewrites broker.json to only the dead session, and returns without shutting the broker down. Since no future hook will run for that owner, the worktree broker remains orphaned indefinitely; fresh evidence after the PID-liveness fix is that this remaining-owner branch now performs no liveness check before preserving the broker.
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Summary
Fixes #380.
handleSessionEndtears down the broker vialoadBrokerSession(input.cwd), andbroker.jsonis stored under a cwd-derived hash (resolveStateDir). When a broker was spawned for a different cwd than the session's cwd, the lookup misses, nobroker/shutdownis sent, and the broker is orphaned — even on graceful exit (/quit, SIGTERM).This is structural in a common workflow: a session runs in the main tree (session cwd = repo root) but runs reviews against a git worktree (broker cwd = worktree). Reviewing a worktree's uncommitted working tree requires broker cwd = worktree, so the mismatch is unavoidable, and graceful exit still leaks the broker.
Fix
Decouple broker cleanup from cwd by keying it on the owning session(s):
broker.json: broker creation records the creating session (resolveSessionIdreadsCODEX_COMPANION_SESSION_ID, which the SessionStart hook already sets), and reusing a ready broker adds the reusing session as a co-owner (sessionIds). A broker shared by several sessions is torn down by the last owner to end, not by whichever session happens to exit first.sessionPids; the SessionStart hook exportsCODEX_COMPANION_SESSION_PIDfrom its parent pid). Teardown prunes co-owners whose pid no longer exists, so a session that died without SessionEnd (SIGKILL/OOM) cannot keep the broker alive forever. Owners without a recorded pid are assumed alive (legacy behavior).teardownBrokersForSession(sessionId)scans the shared state root (resolveStateRoot()) and, for everybroker.jsonowned by the ending session: removes the owner, prunes dead co-owners, and shuts the broker down when no live owner remains — independent of cwd.handleSessionEndcalls it withinput.session_idin addition to the existing cwd-based path (kept as a fast path / fallback for legacy brokers without ownership records). The cwd path only backs off while the broker still has live owners.Robustness hardening on these paths:
withBrokerStateFileLock, mkdir-based with stale-lock reclaim), so concurrent SessionEnd hooks cannot lose an owner update or leave an already-ended owner behind.sendBrokerShutdownis bounded (1s default, configurable) so one unresponsive endpoint cannot hang SessionEnd; local teardown/unlink still proceeds after the timeout.cleanupSessionJobsfailure is captured and rethrown after broker cleanup).isExecutedDirectly()no longer crashes at import time whenprocess.argv[1]does not resolve to a real path.Scope
In scope: orphaning on graceful exit caused by cwd mismatch (the dominant path), plus not letting a crashed co-owner pin a shared broker once any other owner ends gracefully.
Out of scope (separate concerns): a broker whose every owner died without SessionEnd still needs an idle-timeout / parent-liveness watchdog (see #108). Those are complementary and tracked separately.
Changes
scripts/lib/state.mjs— extractresolveStateRoot()(used to scan all workspaces' state without a cwd);resolveStateDirnow reuses it (behavior unchanged).scripts/lib/broker-lifecycle.mjs—resolveSessionId()/resolveSessionPid(); owner bookkeeping (sessionIds,sessionPids) on create and reuse;teardownBrokersForSession(sessionId, {killProcess, shutdownTimeoutMs})with dead-owner pruning;withBrokerStateFileLock; boundedsendBrokerShutdown.scripts/session-lifecycle-hook.mjs— exporthandleSessionEnd; SessionStart also exportsCODEX_COMPANION_SESSION_PID; SessionEnd runs the session-keyed teardown before the cwd-based path and only backs off for live owners; job-cleanup failures no longer skip broker teardown. A smallisMainguard wraps the top-levelmain()so importing the module for tests does not trigger the blocking stdin read (CLI hook execution is preserved).Backward compatibility
STATE_VERSIONunchanged; thesessionId/sessionIds/sessionPidsfields inbroker.jsonare additive.loadBrokerSession/teardownBrokerSession/clearBrokerSessionsignatures and the cwd-based cleanup path are retained. Legacybroker.jsonfiles without ownership records are skipped by the session scan, treated as always-live by the pruning, and still handled by the existing cwd path.Tests
New
tests/broker-lifecycle.test.mjs(node:test), 20 cases coveringresolveStateRoot,resolveSessionId/resolveSessionPidprecedence,teardownBrokersForSession(cross-cwd teardown, non-matching sessionId left intact, legacy/no-sessionId ignored, empty-sessionId no-op, unresponsive-endpoint shutdown timeout, concurrent SessionEnd race via child processes), shared-broker ownership transfer on reuse, dead co-owner pruning (dead pid → teardown; live pid → retained),handleSessionEndregression locks (cwd-mismatch teardown, shared-cwd owner removal, teardown despite job-cleanup failure, dead-sole-owner reclamation), plus runtime coverage for the SessionStart env exports and symlinked plugin roots.node --test tests/*.test.mjs: the new suite is 20/20; no new failures introduced.🤖 Generated with Claude Code