feat(fabric): add NATS EventFabric + RunnerFabric seams (RIG-3107) - #877
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Compass engineering docs preview: https://compass-managed-rig-3107-nat.compass-eng-docs.pages.dev Deployed from Changed pages: |
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First code slice of the T3 NATS fabric (frozen in RIG-2861): a new `go/internal/fabric` package providing the two transport seams the comms and runner planes cut over to, over a single NATS connection. Stacked on the go-1.26 floor bump (its own PR) that the nats-server test dependency requires. **EventFabric** — durable comms fan-out on JetStream. `Publish(ctx, subject, EventRef)` / `Subscribe(ctx, subject, func(EventRef))`. Carries a compact `EventRef` (tenant + kind + row id) as an at-least-once reference, never the payload, so JetStream stays a transport rather than a second store; subscribers re-read Postgres by row id. MsgID = sha256 of the length-prefixed ref for dedup within the Duplicates window; app-level DLQ via `Term()` at the delivery budget. **RunnerFabric** — best-effort runner control on core NATS. `SendCommand(ctx, runnerID, *SessionsResponse)` / `Events(ctx) (<-chan RunnerEvent, error)`; offline runners are recovered by the delivery cursor sweep, not by broker durability. One `Fabric` implements both seams over one `nats.Conn`. Lazy stream ensure (the frozen `New` carries no context, so the topology call derives its ctx from the first Publish/Subscribe). Per-subject durable consumer named `comms-`+sha256(subject) — injective, unlike a `.`→`_` substitution which would collapse two subjects onto one shared consumer. Close registers a `StatusChanged(nats.CLOSED)` listener before draining so it observes connection teardown directly rather than through a clobberable ClosedHandler. Full subject grammar + JetStream config in `SUBJECTS.md` beside the package. Subjects: `compass.<tenant>.comms.<kind>`, `compass.runner.<runner_id>.cmd`, `compass.runner.events` (queue-grouped), `client.<sessionID>`. Spec-impact: none. Refs RIG-3107 Co-authored-by: Matt Wilkinson <matt@rigel.build>
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First code slice of the T3 NATS fabric (frozen in RIG-2861): a new
go/internal/fabricpackage providing the two transport seams the comms and runner planes cut over to, over a single NATS connection. Stacked on the go-1.26 floor bump (its own PR) that the nats-server test dependency requires.EventFabric — durable comms fan-out on JetStream.
Publish(ctx, subject, EventRef)/Subscribe(ctx, subject, func(EventRef)). Carries a compactEventRef(tenant + kind + row id) as an at-least-once reference, never the payload, so JetStream stays a transport rather than a second store; subscribers re-read Postgres by row id. MsgID = sha256 of the length-prefixed ref for dedup within the Duplicates window; app-level DLQ viaTerm()at the delivery budget.RunnerFabric — best-effort runner control on core NATS.
SendCommand(ctx, runnerID, *SessionsResponse)/Events(ctx) (<-chan RunnerEvent, error); offline runners are recovered by the delivery cursor sweep, not by broker durability.One
Fabricimplements both seams over onenats.Conn. Lazy stream ensure (the frozenNewcarries no context, so the topology call derives its ctx from the first Publish/Subscribe). Per-subject durable consumer namedcomms-+sha256(subject) — injective, unlike a.→_substitution which would collapse two subjects onto one shared consumer. Close registers aStatusChanged(nats.CLOSED)listener before draining so it observes connection teardown directly rather than through a clobberable ClosedHandler. Full subject grammar + JetStream config inSUBJECTS.mdbeside the package.Subjects:
compass.<tenant>.comms.<kind>,compass.runner.<runner_id>.cmd,compass.runner.events(queue-grouped),client.<sessionID>.Spec-impact: none. Refs RIG-3107