mirror of https://github.com/hay-kot/homebox.git
86 lines
1.3 KiB
Go
86 lines
1.3 KiB
Go
// Package eventbus provides an interface for event bus.
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package eventbus
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import (
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"sync"
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"github.com/google/uuid"
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)
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type Event string
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const (
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EventLabelMutation Event = "label.mutation"
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EventLocationMutation Event = "location.mutation"
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EventItemMutation Event = "item.mutation"
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)
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type GroupMutationEvent struct {
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GID uuid.UUID
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}
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type eventData struct {
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event Event
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data any
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}
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type EventBus struct {
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started bool
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ch chan eventData
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mu sync.RWMutex
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subscribers map[Event][]func(any)
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}
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func New() *EventBus {
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return &EventBus{
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ch: make(chan eventData, 10),
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subscribers: map[Event][]func(any){
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EventLabelMutation: {},
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EventLocationMutation: {},
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EventItemMutation: {},
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},
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}
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}
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func (e *EventBus) Run() {
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if e.started {
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panic("event bus already started")
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}
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e.started = true
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for event := range e.ch {
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e.mu.RLock()
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arr, ok := e.subscribers[event.event]
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e.mu.RUnlock()
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if !ok {
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continue
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}
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for _, fn := range arr {
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fn(event.data)
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}
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}
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}
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func (e *EventBus) Publish(event Event, data any) {
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e.ch <- eventData{
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event: event,
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data: data,
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}
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}
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func (e *EventBus) Subscribe(event Event, fn func(any)) {
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e.mu.Lock()
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defer e.mu.Unlock()
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arr, ok := e.subscribers[event]
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if !ok {
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panic("event not found")
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}
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e.subscribers[event] = append(arr, fn)
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}
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