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watcher.go
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watcher.go
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package hue
import (
"encoding/json"
"net/http"
"strings"
"sync"
"github.com/lampctl/go-hue/bridge"
"github.com/lampctl/go-sse"
)
// Watcher receives events from the bridge and maintains a list of resources
// and their current states.
type Watcher struct {
mutex sync.Mutex
client *Client
sseClient *sse.Client
resources map[string]*bridge.Resource
closedChan <-chan any
}
func (w *Watcher) loadResources() error {
resources, err := w.client.Resources()
if err != nil {
return err
}
for _, r := range resources {
w.resources[r.ID] = r
}
return nil
}
func (w *Watcher) lifecycleLoop(closedChan chan<- any) {
defer close(closedChan)
for {
e, ok := <-w.sseClient.Events
if !ok {
return
}
var (
stream = []*bridge.EventStream{}
reader = strings.NewReader(e.Data)
)
if err := json.NewDecoder(reader).Decode(&stream); err != nil {
continue
}
func() {
defer w.mutex.Unlock()
w.mutex.Lock()
for _, v := range stream {
for _, e := range v.Data {
r, ok := w.resources[e.ID]
if ok {
r.CopyFrom(e)
}
}
}
}()
}
}
// NewWatcher creates and initializes a new watcher using the provided client.
func NewWatcher(c *Client) (*Watcher, error) {
r, err := c.newRequest(http.MethodGet, "/eventstream/clip/v2", nil)
if err != nil {
return nil, err
}
var (
closedChan = make(chan any)
w = &Watcher{
client: c,
sseClient: sse.NewClient(r, c.Client),
resources: make(map[string]*bridge.Resource),
closedChan: closedChan,
}
)
if err := w.loadResources(); err != nil {
return nil, err
}
go w.lifecycleLoop(closedChan)
return w, nil
}
// Resources returns a slice of resources and their current values.
func (w *Watcher) Resources() []*bridge.Resource {
defer w.mutex.Unlock()
w.mutex.Lock()
resources := []*bridge.Resource{}
for _, r := range w.resources {
rCopy := &bridge.Resource{}
rCopy.CopyFrom(r)
resources = append(resources, rCopy)
}
return resources
}
// Close shuts down the watcher.
func (w *Watcher) Close() {
w.sseClient.Close()
<-w.closedChan
}