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@@ -1,144 +0,0 @@
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package c2
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import (
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"sync"
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"sync/atomic"
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"time"
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)
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// Event 是 EventBus 内部传输的事件单元,是 database.C2Event 的"实时投影"。
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// 区别在于:
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// - 数据库表保存全部历史,用于审计与列表分页;
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// - EventBus 只缓存最近 N 条,用于 SSE/WS 实时推送给在线订阅者。
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type Event struct {
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ID string `json:"id"`
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Level string `json:"level"`
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Category string `json:"category"`
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SessionID string `json:"sessionId,omitempty"`
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TaskID string `json:"taskId,omitempty"`
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Message string `json:"message"`
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Data map[string]interface{} `json:"data,omitempty"`
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CreatedAt time.Time `json:"createdAt"`
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}
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// EventBus 简单的内存广播总线。
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// 设计要点:
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// - 多订阅者:每个订阅者有独立 buffered channel,慢消费者不会阻塞 publisher;
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// - 容量满即丢弃:发布端绝不阻塞,避免 listener accept loop / beacon handler 卡住;
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// - 全局过滤:订阅时可限定 SessionID/Category,前端按需订阅,省 CPU;
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// - 关闭安全:Close() 后所有订阅者 chan 关闭,防止 goroutine 泄漏。
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type EventBus struct {
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mu sync.RWMutex
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subscribers map[string]*Subscription
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closed bool
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}
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// Subscription 订阅句柄
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type Subscription struct {
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ID string
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Ch chan *Event
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SessionID string // 空表示不限制
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Category string // 空表示不限制
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Levels map[string]struct{}
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dropCount atomic.Int64
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}
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// NewEventBus 创建总线
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func NewEventBus() *EventBus {
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return &EventBus{subscribers: make(map[string]*Subscription)}
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}
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// Subscribe 注册订阅者;返回 Subscription,调用方负责后续 Unsubscribe。
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// - bufferSize:单订阅者 channel 容量,建议 64~256;
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// - sessionFilter / categoryFilter:空字符串=不限;
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// - levelFilter:[]string{"warn","critical"} 这类,nil/空表示全收。
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func (b *EventBus) Subscribe(id string, bufferSize int, sessionFilter, categoryFilter string, levelFilter []string) *Subscription {
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if bufferSize <= 0 {
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bufferSize = 128
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}
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sub := &Subscription{
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ID: id,
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Ch: make(chan *Event, bufferSize),
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SessionID: sessionFilter,
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Category: categoryFilter,
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}
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if len(levelFilter) > 0 {
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sub.Levels = make(map[string]struct{}, len(levelFilter))
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for _, l := range levelFilter {
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sub.Levels[l] = struct{}{}
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}
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}
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b.mu.Lock()
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defer b.mu.Unlock()
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if b.closed {
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close(sub.Ch)
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return sub
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}
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b.subscribers[id] = sub
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return sub
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}
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// Unsubscribe 注销订阅者并关闭 channel
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func (b *EventBus) Unsubscribe(id string) {
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b.mu.Lock()
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defer b.mu.Unlock()
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if sub, ok := b.subscribers[id]; ok {
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delete(b.subscribers, id)
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close(sub.Ch)
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}
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}
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// Publish 广播事件给所有订阅者;非阻塞,channel 满时静默丢弃
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func (b *EventBus) Publish(e *Event) {
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if e == nil {
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return
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}
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b.mu.RLock()
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subs := make([]*Subscription, 0, len(b.subscribers))
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for _, s := range b.subscribers {
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if s.matches(e) {
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subs = append(subs, s)
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}
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}
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closed := b.closed
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b.mu.RUnlock()
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if closed {
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return
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}
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for _, s := range subs {
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select {
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case s.Ch <- e:
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default:
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s.dropCount.Add(1)
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}
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}
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}
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// Close 关闭总线,停止所有订阅
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func (b *EventBus) Close() {
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b.mu.Lock()
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defer b.mu.Unlock()
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if b.closed {
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return
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}
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b.closed = true
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for id, s := range b.subscribers {
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close(s.Ch)
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delete(b.subscribers, id)
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}
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}
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func (s *Subscription) matches(e *Event) bool {
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if s.SessionID != "" && e.SessionID != s.SessionID {
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return false
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}
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if s.Category != "" && e.Category != s.Category {
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return false
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}
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if len(s.Levels) > 0 {
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if _, ok := s.Levels[e.Level]; !ok {
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return false
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}
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}
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return true
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}
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