88 lines
2.7 KiB
Go
88 lines
2.7 KiB
Go
package service
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import (
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"context"
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"sync"
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"time"
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"hyapp/pkg/appcode"
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"hyapp/services/room-service/internal/room/outbox"
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)
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const (
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// robotDisplaySampleWindow 是 v1 展示降采样窗口：同房间同事件类型 2 秒内只直发一条机器人展示 IM。
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robotDisplaySampleWindow = 2 * time.Second
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)
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type robotDisplaySampleKey struct {
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appCode string
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roomID string
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eventType string
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}
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type robotDisplaySampler struct {
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mu sync.Mutex
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lastWindow map[robotDisplaySampleKey]int64
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}
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func newRobotDisplaySampler() *robotDisplaySampler {
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return &robotDisplaySampler{lastWindow: make(map[robotDisplaySampleKey]int64)}
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}
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func (s *Service) sampleRobotDisplayRecords(ctx context.Context, records []outbox.Record) []outbox.Record {
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if len(records) == 0 || s == nil || s.robotDisplaySampler == nil {
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return records
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}
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return s.robotDisplaySampler.filter(records, robotDisplaySampleWindow, appcode.FromContext(ctx))
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}
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func (s *robotDisplaySampler) filter(records []outbox.Record, window time.Duration, scopedApp string) []outbox.Record {
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if s == nil || window <= 0 || len(records) == 0 {
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return records
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}
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windowMS := window.Milliseconds()
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out := make([]outbox.Record, 0, len(records))
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s.mu.Lock()
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defer s.mu.Unlock()
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var newestWindow int64
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for _, record := range records {
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key := robotDisplaySampleKey{
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// Build 阶段故意不猜 App；降采样发生在发布边界补值之前，因此必须使用当前命令上下文兜底，
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// 否则不同 App 的同房间标识会共用默认 Lalu 窗口并误丢展示事件。
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appCode: appcode.Normalize(firstNonEmpty(record.AppCode, scopedApp)),
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roomID: record.RoomID,
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eventType: record.EventType,
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}
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createdAtMS := record.CreatedAtMS
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if createdAtMS <= 0 && record.Envelope != nil {
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createdAtMS = record.Envelope.GetOccurredAtMs()
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}
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windowStartMS := createdAtMS / windowMS * windowMS
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if windowStartMS > newestWindow {
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newestWindow = windowStartMS
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}
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if last, exists := s.lastWindow[key]; exists && windowStartMS <= last {
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// 展示事件过密时只丢机器人 IM 展示；Room Cell 命令、房间热度、榜单和火箭状态已经在进入这里前完成计算。
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continue
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}
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s.lastWindow[key] = windowStartMS
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out = append(out, record)
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}
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if newestWindow > 0 && len(s.lastWindow) > 1024 {
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// 机器人房数量和事件类型有限，超过阈值说明进程运行很久；保留最近几个窗口即可避免 map 常驻增长。
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s.pruneLocked(newestWindow - 4*windowMS)
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}
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return out
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}
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func (s *robotDisplaySampler) pruneLocked(beforeWindowMS int64) {
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for key, windowStartMS := range s.lastWindow {
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if windowStartMS < beforeWindowMS {
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delete(s.lastWindow, key)
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}
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}
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}
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