chore: refresh gramsrv public release

internal/app/channels/read_model_cache.go

@@ -0,0 +1,107 @@
+package channels
+
+import (
+	"context"
+	"time"
+
+	"telesrv/internal/app/readmodel"
+	"telesrv/internal/domain"
+	"telesrv/internal/readmodelcache"
+	"telesrv/internal/store"
+)
+
+const (
+	// Full channel views are version-token guarded by channel_base,
+	// channel_member, and dialog_light. Keep the snapshot long-lived; write-side
+	// read-model bumps, not time, drive correctness.
+	defaultChannelViewReadModelTTL = 24 * time.Hour
+	channelViewReadModelMaxEntries = 8192
+)
+
+type channelViewCacheKey struct {
+	userID    int64
+	channelID int64
+}
+
+// channelViewReadModelCache 与 channelResolveReadModelCache 都缓存 domain.ChannelView,
+// 由统一缓存原语承载(版本闸门 / epoch 守卫 / LRU / clone)。
+type channelViewReadModelCache struct {
+	cache *readmodelcache.Cache[channelViewCacheKey, domain.ChannelView]
+}
+
+func newChannelViewReadModelCache(ttl time.Duration) *channelViewReadModelCache {
+	if ttl <= 0 {
+		ttl = defaultChannelViewReadModelTTL
+	}
+	return &channelViewReadModelCache{
+		cache: readmodelcache.New[channelViewCacheKey, domain.ChannelView](readmodelcache.Config[channelViewCacheKey, domain.ChannelView]{
+			MaxEntries: channelViewReadModelMaxEntries,
+			TTL:        ttl,
+			Clone:      cloneChannelView,
+		}),
+	}
+}
+
+func (c *channelViewReadModelCache) getOrLoad(ctx context.Context, key channelViewCacheKey, hash int64, load func() (domain.ChannelView, error)) (domain.ChannelView, error) {
+	if c == nil {
+		return load()
+	}
+	return c.cache.GetOrLoadVersioned(ctx, key, hash, load)
+}
+
+func (s *Service) cachedChannelView(ctx context.Context, userID, channelID int64) (domain.ChannelView, error) {
+	if s.viewCache == nil || s.versions == nil {
+		return s.channels.GetChannel(ctx, userID, channelID)
+	}
+	hash, err := s.channelViewHash(ctx, userID, channelID)
+	if err != nil {
+		return domain.ChannelView{}, err
+	}
+	if hash == 0 {
+		return s.channels.GetChannel(ctx, userID, channelID)
+	}
+	key := channelViewCacheKey{userID: userID, channelID: channelID}
+	return s.viewCache.getOrLoad(ctx, key, hash, func() (domain.ChannelView, error) {
+		return s.channels.GetChannel(ctx, userID, channelID)
+	})
+}
+
+func (s *Service) channelViewHash(ctx context.Context, userID, channelID int64) (int64, error) {
+	keys := []store.ReadModelKey{
+		{Model: readmodel.ModelChannelBase, OwnerUserID: 0, PeerType: domain.PeerTypeChannel, PeerID: channelID},
+		{Model: readmodel.ModelChannelMember, OwnerUserID: userID, PeerType: domain.PeerTypeChannel, PeerID: channelID},
+		{Model: readmodel.ModelDialogLight, OwnerUserID: userID, PeerType: domain.PeerTypeChannel, PeerID: channelID},
+		// 快照含 SelfBoostsApplied：必须把 channel_self_boosts 纳入校验 token，否则 apply/revoke
+		// 加成不会失效这份长 TTL 快照。注：boost 自然到期是 time-based、不触发写，故其残余仍受 TTL 约束。
+		{Model: readmodel.ModelChannelSelfBoosts, OwnerUserID: userID, PeerType: domain.PeerTypeChannel, PeerID: channelID},
+	}
+	rows, err := s.versions.ReadModelHashes(ctx, keys)
+	if err != nil {
+		return 0, err
+	}
+	base := rows[keys[0]]
+	if base == 0 {
+		return 0, nil
+	}
+	return readmodel.MixHashes(base, rows[keys[1]], rows[keys[2]], rows[keys[3]]), nil
+}
+
+func cloneChannelView(in domain.ChannelView) domain.ChannelView {
+	in.Channel = cloneChannel(in.Channel)
+	if in.Dialog.DefaultSendAs != nil {
+		peer := *in.Dialog.DefaultSendAs
+		in.Dialog.DefaultSendAs = &peer
+	}
+	if in.ExportedInvite != nil {
+		invite := *in.ExportedInvite
+		in.ExportedInvite = &invite
+	}
+	return in
+}
+
+func cloneChannel(in domain.Channel) domain.Channel {
+	in.PhotoStripped = append([]byte(nil), in.PhotoStripped...)
+	in.ReactionPolicy.Emoticons = append([]string(nil), in.ReactionPolicy.Emoticons...)
+	in.ReactionPolicy.CustomEmojiIDs = append([]int64(nil), in.ReactionPolicy.CustomEmojiIDs...)
+	return in
+}