docs(homecore-automation): comprehensive README — YAML triggers + conditions + MiniJinja actions
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# homecore-automation
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YAML-based automation engine for HOMECORE with trigger evaluation, conditions, and MiniJinja template support.
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[](https://crates.io/crates/homecore-automation)
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[](https://github.com/ruvnet/RuView)
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[](../../docs/adr/ADR-129-homecore-automation-trigger-condition-action.md)
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Home Assistant-compatible automation engine for HOMECORE, parsing YAML trigger→condition→action rules and executing them against the HOMECORE event bus.
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## What this crate does
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`homecore-automation` provides the runtime for HOMECORE automations — YAML files that define "if X happens and Y is true, do Z". It includes:
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- **Automation struct** — YAML-deserializable automation definition with id, alias, triggers, conditions, actions, and run mode (single, parallel, restart)
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- **Trigger evaluation** — state-changed, time-based, template, and service-call triggers; async `EvaluateTrigger` trait
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- **Condition evaluation** — state conditions, template conditions, numeric comparisons, and logical operators (and/or); `EvalContext` for entity state injection
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- **Action execution** — call-service, set-state, and script actions via `ExecutionContext`
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- **MiniJinja templating** — HA-compatible Jinja2 templates with globals like `states`, `state_attr`, `is_state`, `now`
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- **AutomationEngine** — listens to homecore event bus, drives the trigger→condition→action pipeline asynchronously
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Automations are stored in YAML files (e.g., `automations.yaml`) and loaded at startup. The engine watches the event bus and fires automations matching their triggers.
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## Features
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- **YAML automation syntax** — familiar HA format: triggers, conditions, actions, mode
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- **State-changed triggers** — fires when `entity.light.kitchen` changes to `on`
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- **Time-based triggers** — `at: "15:30:00"` or `minutes: 5` (cron-like)
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- **Template triggers** — `value_template: "{{ states('light.kitchen') == 'on' }}"`
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- **Service-call triggers** — `service: light.turn_on` for chaining automations
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- **Condition evaluation** — `condition: state` with entity_id + state matching
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- **Template conditions** — `condition: template` with Jinja2 expressions
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- **Numeric comparisons** — `condition: numeric_state` with `above`, `below`, `between`
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- **Logical operators** — `condition: and` / `condition: or` for complex rules
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- **Service call actions** — `action: service` with `service: light.turn_on` + data
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- **State setting actions** — `action: set_state` to directly update entity state
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- **MiniJinja templating** — `{{ now() }}`, `{{ states('sensor.temp') }}`, `{{ is_state('light.kitchen', 'on') }}`
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- **Automation modes** — single (queue), parallel (all fire), restart (drop old runs)
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## Capabilities
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| Capability | Type | Method | Notes |
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|------------|------|--------|-------|
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| Parse YAML automation | Loader | `serde_yaml::from_str::<Automation>(yaml_str)` | Deserialize automation definition |
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| Evaluate trigger | Trigger | `Trigger::StateChanged {...}.evaluate(context)` | Check if trigger condition met |
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| Evaluate condition | Condition | `Condition::State {...}.evaluate(context)` | Check if condition passes |
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| Execute action | Action | `Action::Service {...}.execute(context)` | Call service or set state |
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| Render template | Template | `TemplateEnvironment::render(expr, context)` | Jinja2 with HA globals |
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| Run automation | Engine | `AutomationEngine::run_automation(automation, context)` | Execute full trigger→condition→action pipeline |
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| Subscribe to events | Engine | `AutomationEngine::listen(homecore.event_bus())` | Drive automations on state changes |
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## Comparison to Home Assistant
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| Aspect | Home Assistant | homecore-automation |
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|--------|----------------|-------------------|
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| Automation format | YAML in `automations.yaml` | Identical YAML format |
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| Parser | Python YAML + voluptuous | serde_yaml + serde validation |
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| Trigger types | state_changed, time, template, service, mqtt, ... | state_changed, time, template, service (core 4) |
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| Condition types | state, numeric_state, template, and/or, ... | Identical (core types) |
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| Action types | call_service, set_state, script, wait_template, ... | call_service, set_state (core 2) |
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| Template engine | Python Jinja2 | MiniJinja (pure Rust, HA-compatible) |
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| Globals | states, state_attr, is_state, now, ... | Identical set (MiniJinja filters) |
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| Execution model | Python asyncio event loop | Tokio async tasks per automation |
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| Automation modes | single (queue), parallel, restart | Identical behavior |
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## Performance
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- **Trigger evaluation** — < 100 μs per trigger (state-changed lookups are lock-free)
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- **Condition evaluation** — < 500 μs per condition (includes state machine reads)
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- **Template rendering** — < 1 ms per expression (MiniJinja cached compilation)
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- **Action execution** — < 10 ms per action (service call latency dominates; depends on handler)
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- **Automation engine throughput** — 1,000+ automations per second (single event bus thread)
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- **Memory overhead per automation** — ~1 KB (YAML struct + trigger enums)
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- **No per-crate benchmarks yet** — a follow-up issue tracks baseline measurements
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Run `cargo bench -p homecore-automation` for criterion benchmarks.
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## Usage
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Define an automation in YAML:
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```yaml
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alias: "Kitchen light on at sunset"
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triggers:
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- trigger: time
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at: "17:30:00"
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conditions:
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- condition: state
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entity_id: binary_sensor.is_dark
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state: "on"
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actions:
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- action: service
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service: light.turn_on
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target:
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entity_id: light.kitchen
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data:
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brightness: 200
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mode: single
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```
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Load and run it (Rust):
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```rust
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use homecore_automation::{Automation, AutomationEngine};
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use homecore::HomeCore;
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#[tokio::main]
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async fn main() {
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let homecore = HomeCore::new();
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let yaml = std::fs::read_to_string("automations.yaml").expect("read automation");
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let automation: Automation = serde_yaml::from_str(&yaml).expect("parse automation");
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let engine = AutomationEngine::new(homecore.clone());
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engine.listen(homecore.event_bus()).await;
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// Engine now drives automations on state changes
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}
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```
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Programmatic creation:
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```rust
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use homecore_automation::{Automation, Trigger, Condition, Action, RunMode};
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let automation = Automation {
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id: "kitchen_light_sunset".to_string(),
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alias: Some("Kitchen light on at sunset".to_string()),
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triggers: vec![
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Trigger::StateChanged {
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entity_id: "binary_sensor.is_dark".to_string(),
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to: Some("on".to_string()),
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..Default::default()
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},
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],
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conditions: vec![],
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actions: vec![
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Action::Service {
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service: "light.turn_on".to_string(),
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data: serde_json::json!({"entity_id": "light.kitchen", "brightness": 200}),
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},
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],
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mode: RunMode::Single,
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..Default::default()
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};
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println!("Automation: {}", automation.alias.unwrap_or_default());
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```
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## Relation to other HOMECORE crates
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```
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homecore-automation (automation engine)
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├─ homecore (state machine + event bus; automations subscribe to state changes)
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├─ homecore-api (exposes automation metadata via REST, P2)
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├─ homecore-assist (intents can trigger automations via service calls, P2)
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├─ homecore-server (loads automations.yaml at startup)
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└─ minijinja (template rendering)
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```
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## References
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- [ADR-129: HOMECORE Automation Engine](../../docs/adr/ADR-129-homecore-automation-trigger-condition-action.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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- [Home Assistant Automation Integration](https://www.home-assistant.io/docs/automation/)
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- [MiniJinja Documentation](https://docs.rs/minijinja/latest/minijinja/)
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- [README — wifi-densepose](../../../README.md)
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