100 lines
3.1 KiB
Go
100 lines
3.1 KiB
Go
package postgres
|
||
|
||
import (
|
||
"context"
|
||
|
||
"telesrv/internal/domain"
|
||
"telesrv/internal/readmodelcache"
|
||
)
|
||
|
||
type channelDialogCacheKey struct {
|
||
userID int64
|
||
channelID int64
|
||
}
|
||
|
||
// ChannelDialogCache 缓存 viewer 作用域的频道 dialog 投影,由统一缓存原语
|
||
// readmodelcache.Cache 承载(LRU 单条驱逐 / epoch 守卫 / singleflight 内建)。
|
||
//
|
||
// 仅在连接池(非事务)读路径使用。缓存值依赖 channel_base、channel_member(viewer,channel)、
|
||
// dialog_light(viewer,channel) 三个 read model;ReadModelChangeListener 在写侧 NOTIFY 时
|
||
// 失效对应键,重连时 flush。warm-from-list 经 put 回填(含 DefaultSendAs)。
|
||
type ChannelDialogCache struct {
|
||
cache *readmodelcache.Cache[channelDialogCacheKey, domain.ChannelDialog]
|
||
}
|
||
|
||
func NewChannelDialogCache(max int) *ChannelDialogCache {
|
||
cache := readmodelcache.New[channelDialogCacheKey, domain.ChannelDialog](readmodelcache.Config[channelDialogCacheKey, domain.ChannelDialog]{
|
||
MaxEntries: max,
|
||
Clone: cloneChannelDialog,
|
||
})
|
||
if cache == nil {
|
||
return nil
|
||
}
|
||
return &ChannelDialogCache{cache: cache}
|
||
}
|
||
|
||
func (c *ChannelDialogCache) get(userID, channelID int64) (domain.ChannelDialog, bool) {
|
||
if c == nil || userID == 0 || channelID == 0 {
|
||
return domain.ChannelDialog{}, false
|
||
}
|
||
return c.cache.Peek(channelDialogCacheKey{userID: userID, channelID: channelID})
|
||
}
|
||
|
||
func (c *ChannelDialogCache) getOrLoad(ctx context.Context, userID, channelID int64, load func() (domain.ChannelDialog, error)) (domain.ChannelDialog, error) {
|
||
if c == nil || userID == 0 || channelID == 0 {
|
||
return load()
|
||
}
|
||
return c.cache.GetOrLoad(ctx, channelDialogCacheKey{userID: userID, channelID: channelID}, load)
|
||
}
|
||
|
||
func (c *ChannelDialogCache) put(dialog domain.ChannelDialog) {
|
||
if c == nil || dialog.UserID == 0 || dialog.ChannelID == 0 {
|
||
return
|
||
}
|
||
c.cache.Store(channelDialogCacheKey{userID: dialog.UserID, channelID: dialog.ChannelID}, dialog)
|
||
}
|
||
|
||
// cacheEpoch 在「列表暖写回」前快照 epoch；配合 putIfEpoch 堵住 warm-vs-invalidation
|
||
// 竞态:DB 查询返回后到写回之间若收到失效(epoch 自增),陈旧投影写回被拒。
|
||
func (c *ChannelDialogCache) cacheEpoch() uint64 {
|
||
if c == nil {
|
||
return 0
|
||
}
|
||
return c.cache.LoadEpoch()
|
||
}
|
||
|
||
func (c *ChannelDialogCache) putIfEpoch(dialog domain.ChannelDialog, loadEpoch uint64) {
|
||
if c == nil || dialog.UserID == 0 || dialog.ChannelID == 0 {
|
||
return
|
||
}
|
||
c.cache.StoreIfEpoch(channelDialogCacheKey{userID: dialog.UserID, channelID: dialog.ChannelID}, dialog, loadEpoch)
|
||
}
|
||
|
||
func (c *ChannelDialogCache) delete(userID, channelID int64) {
|
||
if c == nil || userID == 0 || channelID == 0 {
|
||
return
|
||
}
|
||
c.cache.Invalidate(channelDialogCacheKey{userID: userID, channelID: channelID})
|
||
}
|
||
|
||
func (c *ChannelDialogCache) deleteChannel(channelID int64) {
|
||
if c == nil || channelID == 0 {
|
||
return
|
||
}
|
||
c.cache.InvalidateWhere(func(k channelDialogCacheKey) bool { return k.channelID == channelID })
|
||
}
|
||
|
||
func (c *ChannelDialogCache) flush() {
|
||
if c == nil {
|
||
return
|
||
}
|
||
c.cache.Flush()
|
||
}
|
||
|
||
func cloneChannelDialog(dialog domain.ChannelDialog) domain.ChannelDialog {
|
||
if dialog.DefaultSendAs != nil {
|
||
peer := *dialog.DefaultSendAs
|
||
dialog.DefaultSendAs = &peer
|
||
}
|
||
return dialog
|
||
}
|