lpgauth/swirl

Swirl is a high-performance Erlang stream processing engine designed for distributed data flows. It enables users to define configurable pipelines with mappers, reducers, and windowing logic, while managing state and node coordination through built-in mechanisms like ETS tables and a code distribution server. The system supports event filtering via a query language and provides telemetry instrumentation to monitor flow lifecycle and dispatch granularity.

Version 0.2.9 introduces four new telemetry events (\[swirl, flow, start\], \[swirl, flow, stop\], \[swirl, mapper, window\], \[swirl, reducer, window\]) to monitor flow lifecycle and window dispatch granularity, requiring the addition of the telemetry 1.4.2 dependency. This release also includes infrastructure updates from version 0.2.8, such as switching the uuid dependency to the hex package uuid\_erl 2.0.7, migrating documentation generation from edown to rebar3\_ex\_doc, and updating the CI matrix to support OTP 25-28.

(repo-wide) · high confidence

Swirl is introduced as a high-performance Erlang stream processor (version 0.2.9) that enables distributed data flows with configurable mappers and reducers. The system features a code distribution mechanism via a code server to handle module updates across nodes, a query language (swirl\_ql) for filtering events, and a heartbeat system to automatically restart dead mappers. Users can define flows with specific windowing, flushing, and concurrency options, while the engine manages state through ETS tables and exposes telemetry events for monitoring.

src · high confidence

This change adds the core header file for the Swirl library, defining the records and types that constitute its public API. Users can now define flows using the new \#flow record, which supports configuration for mappers and reducers (including options, windows, and node limits), stream filtering, and heartbeats. The file also introduces the \#stream record for tracking stream state and defines the exp\_tree type for stream filtering expressions, establishing the foundational data structures for the library's distributed processing capabilities.

include · high confidence

A change to existing behaviour in bin — 3 commits, 1 file.

bin · medium confidence · unverified

The project documentation has been regenerated using ExDoc v0.39.1, updating the API reference, changelog, and search assets for swirl v0.2.8. This rebuild reflects the infrastructure modernization in version 0.2.8, which migrated the documentation toolchain from edown to rebar3\_ex\_doc, switched the uuid dependency to the uuid\_erl hex package, and updated the CI matrix to support OTP 25-28.

doc · high confidence

Added new test suites to verify the behavior of the \swirl\_flow\ module and the \swirl\_ql\ query language parser/evaluator. The \swirl\_flow\_tests\ module exercises the flow lifecycle, including mapper/reducer logic and stream filtering, while \swirl\_ql\_tests\ validates the parsing and evaluation of comparison, set membership, and logical predicates.

test · high confidence

Written by watchdog.canine.dev from the codebase's own history, inside the signed delivery this page is composed from.

• CAI 59 → 60 (+0.6)
• Rubric changed (rubric-2026.09.12 → rubric-2026.09.18) — scores are not directly comparable.

• Code Health 99 → 99 (+0.0)
• Architecture 69 → 69 (+0.0)
• Maturity 39 → 39 (+0.0)
• Readiness 78 → 80 (+2.3)
• Security 92 → 96 (+4.0)

• Coverage not measured — no coverage collector is wired up

• Documentation: no licence statement (README.md)
• Documentation: no project overview (README.md)

Written by watchdog.canine.dev from the codebase's own history, inside the signed delivery this page is composed from.

lpgauth/swirl was measured the same way every project in this corpus was: the same rubric, at a pinned commit, with the result published in full. Point a surveyor at a repository you know and see whether you agree with it.