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SMOODEV-1892: Redis + NATS Backplane backends — cross-pod scale-out #9

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Merged
brentrager merged 1 commit into from
Jun 14, 2026
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SMOODEV-1892: Redis + NATS Backplane backends — cross-pod scale-out #9

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5 changes: 5 additions & 0 deletions .changeset/backplane-impls.md
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'@smooai/smooth-operator': minor
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Distributed Backplane backends (SMOODEV-1892): `RedisBackplane` and `NatsBackplane` — the horizontal scale-out seam. Both implement the `Backplane` trait by wrapping a per-pod `InMemoryBackplane` for local registry + delivery and adding a pub/sub bus (Redis/Valkey channel or NATS subject) for cross-pod fan-out: `publish(Target, event)` delivers to local sockets immediately, then broadcasts a `BackplaneEnvelope` so every other pod re-resolves the target against its own registry and delivers to its sockets (the origin pod skips its own echo). This makes the same `publish` call reach a socket on any replica — required to run the WS service with >1 pod, and the cross-pod path for non-AI publishers. Selected at runtime via `SMOOTH_AGENT_BACKPLANE` (`memory` | `redis`/`valkey` | `nats`) + `SMOOTH_AGENT_BACKPLANE_URL`; default stays single-process in-memory. `Target` is now `Serialize`/`Deserialize` and a shared `BackplaneEnvelope` is exposed so a host's own transport adapter can speak the same wire format. New crates: `adapters/backplane-redis`, `adapters/backplane-nats` (cross-pod fan-out proven end-to-end over real Redis + NATS via testcontainers).
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