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fix: harden module lifecycle compatibility - #21
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📝 WalkthroughWalkthroughThe module ABI and SDK now support optional reinitialization callbacks with bounded setup. The transport serializes reinitialization and shutdown. The host tracks active lifecycle operations and awaits shutdown through the transport. ChangesModule lifecycle and reconfiguration
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant ModuleHost
participant ModuleTransport
participant ModuleCallback
ModuleHost->>ModuleTransport: reinitialize(config)
ModuleTransport->>ModuleTransport: acquire lifecycle lock
ModuleTransport->>ModuleCallback: run reinitialize callback
ModuleCallback-->>ModuleTransport: return callback result
ModuleTransport-->>ModuleHost: return reinitialization result
ModuleHost->>ModuleTransport: stop(deadline)
ModuleTransport->>ModuleTransport: acquire lifecycle lock
ModuleTransport->>ModuleCallback: run shutdown callback
ModuleCallback-->>ModuleTransport: return shutdown result
ModuleTransport-->>ModuleHost: return shutdown result
Merge Risk: 🟡 Moderate · up to Shutdown can leave a reinitializing module running, or report a stopped module as ready after a timeout. Resolve both lifecycle failures before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 31.71% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 41 functions across 5 files. (3 skipped: 3 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
A rabbit checks the callback clock, Comment |
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Actionable comments posted: 2
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@crates/tinybus/src/module/host.rs`:
- Around line 762-766: Update ModuleHost::shutdown so a host-side lifecycle
reservation does not prevent stopping a module: use a stop path that waits for
the transport lifecycle lock within the supplied deadline when shutdown
encounters a busy module, while preserving fail-fast behavior for the public
StopModule path. Update
shutdown_does_not_report_a_module_stopped_while_reinitialization_is_running to
assert the resulting stopped state after reinitialization releases the lock, or
the unchanged ready state when the deadline expires first.
- Around line 1255-1258: Update ModuleTransport::stop and its caller to
distinguish a timeout before the shutdown task is created from one after it is
spawned. Clear module.transition_from only for the pre-spawn timeout; preserve
the transition and return the error for a spawned-task timeout so shutdown can
complete and update the module state.
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Cargo.tomlcrates/tinybus-module/src/lib.rscrates/tinybus/src/module/abi.rscrates/tinybus/src/module/host.rscrates/tinybus/src/module/host_test.rscrates/tinybus/src/module/transport.rsdocs/modules/module/README.mddocs/modules/module/abi.md
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tinybus/crates/tinybus-module/src/lib.rs
Line 629 in 7dcdf78
Include lock waiting in the reinitialization deadline
When two ABI reinitialization callbacks are entered concurrently, the second can spend nearly four seconds blocked on this mutex before beginning its own four-second timeout, so that call can run for almost eight seconds despite the documented mandatory four-second module-side deadline. Start the deadline before acquiring the serialization lock and bound the lock wait with the same remaining budget.
AGENTS.md reference: AGENTS.md:L104-L105
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| self: Arc<Self>, | ||
| deadline: Duration, | ||
| ) -> std::result::Result<i32, StopError> { | ||
| self.stop_task_spawned.store(false, Ordering::Release); |
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Fresh evidence beyond the earlier cancellation case is that a second stop resets this shared flag while a first cancelled stop's shutdown callback is still running. If the second stop waits on the lifecycle mutex and is then cancelled, its guard observes false and clears transition_from; when the first callback finally closes the transport, peer_detached no longer recognizes the planned stop and can leave the disconnected module reported as Ready. Keep launch state on each stop operation, or prevent another host stop from replacing the pending transition until the original callback completes.
AGENTS.md reference: AGENTS.md:L58-L60
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Summary
Follow-up for late review findings that arrived after #19 and #20 had already merged.
Review dispositions
Two late findings did not require code changes:
Validation
Closes the unresolved compatibility finding left on #19 and addresses the post-merge lifecycle review on #20.
Summary by CodeRabbit
New Features
Bug Fixes
Documentation