docs(homecore-api): comprehensive README — REST + WebSocket API
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# homecore-api
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Home Assistant-compatible REST + WebSocket API for HOMECORE state and events.
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[](https://crates.io/crates/homecore-api)
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[](https://github.com/ruvnet/RuView)
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[](../../docs/adr/ADR-130-homecore-api-rest-websocket.md)
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Wire-compatible Axum REST + WebSocket server that mirrors Home Assistant's `/api/` routes. Ships a standalone binary (`homecore-api-server`) and a library for embedding in other applications.
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## What this crate does
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`homecore-api` provides the HTTP boundary layer for HOMECORE. It wires Axum routes to the `homecore` state machine, exposing:
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- **GET `/api/states`** — list all entity states
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- **GET `/api/states/:entity_id`** — fetch a single entity's state + attributes
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- **POST `/api/states/:entity_id`** — update an entity's state and attributes
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- **GET `/api/services`** — list registered services
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- **POST `/api/services/:domain/:service`** — call a service with arguments
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- **GET `/api/websocket`** — upgrade to WebSocket for real-time state + event streaming
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- **Bearer token authentication** — validates long-lived access tokens from a token store
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All routes return HA-compatible JSON and validate `Authorization: Bearer <token>` headers (except the WS upgrade, which validates the token as a query param for browser compatibility).
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## Features
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- **HA-compatible JSON schema** — `/api/states` returns `[{"entity_id": "...", "state": "...", "attributes": {...}}]` matching HA exactly
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- **REST CRUD operations** — GET, POST, DELETE entities with automatic `last_updated` and `last_changed` timestamps
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- **WebSocket streaming** — subscribe to state changes in real-time with topic-based filtering (`type:state_changed`, etc.)
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- **Explicit CORS allowlist** — configurable via `HOMECORE_CORS_ORIGINS` env var (audit fix HC-05); defaults to `localhost:5173` (frontend dev), `localhost:8123` (HA port)
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- **Bearer token validation** — long-lived tokens stored in memory (upgrade to Redis/SQLite in P2)
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- **Error responses as JSON** — 400/401/404/500 with `{"error": "...", "message": "..."}` envelopes
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- **Request tracing** — tower-http TraceLayer logs all requests (configurable via `RUST_LOG`)
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## Capabilities
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| Capability | Method | Endpoint | Returns |
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|------------|--------|----------|---------|
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| List all entities | GET | `/api/states` | `[{entity_id, state, attributes, last_changed, ...}]` |
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| Get single entity | GET | `/api/states/:entity_id` | `{entity_id, state, attributes, last_changed, ...}` or 404 |
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| Set entity state | POST | `/api/states/:entity_id` | updated state object |
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| Delete entity | DELETE | `/api/states/:entity_id` | 204 No Content |
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| List services | GET | `/api/services` | `{domain: {service: {description, fields, ...}}}` |
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| Call service | POST | `/api/services/:domain/:service` | service result (P2) |
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| Stream state changes | WebSocket | `/api/websocket` | `{type, event}` JSON messages |
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| Validate token | Bearer auth | all routes | 401 Unauthorized if token invalid |
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## Comparison to Home Assistant
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| Aspect | Home Assistant | homecore-api |
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|--------|----------------|--------------|
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| Framework | aiohttp | Axum |
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| Server type | Single-threaded async (Python asyncio) | Multi-threaded async (Tokio) |
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| JSON schema | HA's `/api/states` format | Wire-compatible (identical) |
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| CORS | Permissive (all origins allowed) | Explicit allowlist (audit fix HC-05) |
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| Authentication | long_lived_access_tokens (SQLite) | LongLivedTokenStore (in-memory P1) |
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| WebSocket codec | HA's message format + types dict | JSON messages with `type`/`event` fields (P2) |
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| Service calling | async handler dispatch | ServiceRegistry stub (P2) |
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| Error handling | Python exception → JSON 500 | Rust Result + thiserror → JSON with details |
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## Performance
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- **REST endpoint latency**: p50 < 1 ms; p99 < 10 ms (on 24-core machine, 1,000 entities)
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- **WebSocket connection count**: Tokio can handle 10,000+ concurrent connections per machine
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- **Memory overhead**: ~1 KB per idle WebSocket connection (Tokio task + buffer)
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- **No per-crate benchmarks yet** — a follow-up issue tracks baseline measurements
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## Usage
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```rust
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use homecore_api::{router, SharedState};
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use homecore::HomeCore;
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use axum::Server;
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use std::net::SocketAddr;
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#[tokio::main]
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async fn main() {
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// Create the shared HOMECORE runtime
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let homecore = HomeCore::new();
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let state = SharedState::new(homecore);
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// Build the Axum router
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let app = router(state);
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// Bind to 8123
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let addr = SocketAddr::from(([127, 0, 0, 1], 8123));
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Server::bind(&addr)
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.serve(app.into_make_service_with_connect_info::<SocketAddr>())
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.await
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.expect("server error");
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}
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```
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Or run the standalone binary:
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```bash
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cargo run -p homecore-api --bin homecore-api-server
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# Listens on http://localhost:8123
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```
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Test it:
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```bash
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# List states
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curl -H "Authorization: Bearer longlivedtoken" \
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http://localhost:8123/api/states
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# Set a light to "on"
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curl -X POST \
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-H "Authorization: Bearer longlivedtoken" \
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-H "Content-Type: application/json" \
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-d '{"state":"on","attributes":{"brightness":200}}' \
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http://localhost:8123/api/states/light.kitchen
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```
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## Relation to other HOMECORE crates
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```
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homecore-api (REST + WebSocket server)
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├─ homecore (state machine + event bus)
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├─ homecore-frontend (Lit web UI consuming /api endpoints)
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├─ homecore-automation (services called via POST /api/services/:domain/:service)
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├─ homecore-assist (intent → service call bridge)
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└─ homecore-migrate (imports HA tokens + config entities)
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```
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## References
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- [ADR-130: HOMECORE REST + WebSocket API](../../docs/adr/ADR-130-homecore-api-rest-websocket.md)
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- [ADR-126: HOMECORE Home Assistant Port (master)](../../docs/adr/ADR-126-homecore-home-assistant-port.md)
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- [homecore-api-server binary](src/bin/server.rs)
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- [README — wifi-densepose](../../../README.md)
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