84 lines
3.0 KiB
Markdown
84 lines
3.0 KiB
Markdown
# HATS
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[Home Assistant](https://www.home-assistant.io/) + [NATS](https://nats.io/) = HATS
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## Features
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- Push Home Assistant websocket events to a NATS message queue
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- Caching proxy for Home Assistant API
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- Generic implementations for subscribing to NATS topics
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- Clients for some application APIs (limited functionality)
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- [Gokapi](https://github.com/Forceu/Gokapi)
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- [ntfy](https://github.com/binwiederhier/ntfy)
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- [qBittorrent](https://github.com/qbittorrent/qBittorrent)
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- [Syncthing](https://github.com/syncthing/syncthing)
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- [National Weather Service](https://www.weather.gov/)
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## NATS Topics
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- `homeassistant.states.{domain}.{entity}.{state}` - Home Assistant device state changes: [payload](https://www.home-assistant.io/docs/configuration/state_object/)
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- `homeassistant.attributes.{domain}.{entity}.{state}` - When a device's attributes change but the state hasn't changed: [payload](https://www.home-assistant.io/docs/configuration/state_object/)
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- `homeassistant.zha.{device IEEE}` - ZHA events: [payload](https://www.home-assistant.io/docs/configuration/state_object/)
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- `homeassistant.zwave-scene.{device ID}` - ZwaveJS scene events: [payload](https://www.home-assistant.io/integrations/zwave_js/#scene-events-value-notification)
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- `homeassistant.nfc.{tag ID}` - Home Assistant NFC tag scanned: [payload](https://www.home-assistant.io/docs/configuration/state_object/)
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- `homeassistant.timer.{timer name}.finished` - Home Assistant timer finished: payload is simply `"finished"`
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- `schedules.{schedule name}` - HATS schedule finished: payload is simply `"finished"`
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- `command.{command name}` - Command called via HATS API: payload is a byte array of the HTTP Post body
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## Example Client
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```golang
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package main
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import (
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"log/slog"
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"os"
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"os/signal"
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"syscall"
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"code.jhot.me/jhot/hats/pkg/client"
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"code.jhot.me/jhot/hats/pkg/config"
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ha "code.jhot.me/jhot/hats/pkg/homeassistant"
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"code.jhot.me/jhot/hats/pkg/nats"
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n "github.com/nats-io/nats.go"
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)
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var (
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logger *slog.Logger
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hatsClient *client.HatsClient
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natsClient *nats.NatsConnection
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)
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func main() {
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cfg := config.FromEnvironment()
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logger = slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
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Level: cfg.GetLogLevel(),
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}))
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hatsClient = client.NewHatsClient(cfg.GetHatsBaseUrl(), cfg.HatsToken)
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natsClient = nats.DefaultNatsConnection().WithJetstream(false).WithHostName(cfg.NatsHost).
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WithPort(cfg.NatsPort).WithConnectionOption(n.Name(cfg.NatsClientName))
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err := natsClient.Connect()
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if err != nil {
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panic(err)
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}
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defer natsClient.Close()
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go natsClient.GenericStateSubscriber(logger, "sun.sun", SunHandler)
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sigch := make(chan os.Signal, 1)
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signal.Notify(sigch, syscall.SIGINT, syscall.SIGQUIT, syscall.SIGTERM)
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<-sigch
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logger.Info("SIGTERM received")
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}
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func SunHandler(state ha.StateData) error {
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var service string
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if up := ha.StateToBool(state.State); up {
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service = ha.Services.TurnOff
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} else {
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service = ha.Services.TurnOn
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}
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return hatsClient.CallService("light.some_light", service)
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}
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``` |