143 lines
5.2 KiB
Go
143 lines
5.2 KiB
Go
package userprojection
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import (
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"context"
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"time"
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"telesrv/internal/domain"
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"telesrv/internal/readmodelcache"
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)
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// DefaultPhotoCacheTTL 是头像投影缓存的兜底有效期；正常正确性依赖写入侧触发
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// read_model_versions/NOTIFY 后显式失效，TTL 只负责覆盖进程外漏通知或手工改库。
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const DefaultPhotoCacheTTL = 10 * time.Second
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const photoCacheMaxEntries = 200000
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// combinedPhotoProvider 是同时具备 batch 与 kind 两种头像查询能力的底层 provider（postgres
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// MediaStore 即满足）。
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type combinedPhotoProvider interface {
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ProfilePhotoProvider
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ProfilePhotoKindProvider
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}
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type photoCacheKey struct {
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ownerType domain.PeerType
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ownerID int64
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kind domain.ProfilePhotoKind
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}
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// photoCacheValue 含负缓存:has=false 表示「已查过、该 owner 无此 kind 头像」,
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// 避免无头像 owner 反复打 PG。
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type photoCacheValue struct {
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ref domain.ProfilePhotoRef
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has bool
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}
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// CachedPhotoProvider 给 owner 的当前 profile/fallback 头像查询加一层短 TTL 进程内缓存,
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// 由统一缓存原语承载(LRU 单条驱逐 / epoch 守卫 / clone;批量经 GetOrLoadBatch)。
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// projectBatch / ForViewers 对每批 owner 固定打 2 次 CurrentProfilePhotosKind（profile+fallback），
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// 且 base user 命中 redis 也不短路——高频「返回用户」的 RPC（getUsers 等）会把这两条头像查询
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// 刷到与 RPC 同频。这里按 (ownerType, ownerID, kind) 缓存结果（含负结果），命中 owner 不进 PG。
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//
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// 注意：只缓存 owner-only 的 profile/fallback；personal photo 是 per-viewer 的（contacts.PersonalPhotos），
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// 不经此 provider，故无跨 viewer 串号风险。隐私裁剪发生在投影之后、缓存之外，缓存的是 owner 原始
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// 头像 ref 而非投影结果，故不会把某 viewer 的可见性固化给其他 viewer。
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type CachedPhotoProvider struct {
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inner combinedPhotoProvider
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cache *readmodelcache.Cache[photoCacheKey, photoCacheValue]
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}
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// NewCachedPhotoProvider 包装底层 provider；ttl<=0 用 DefaultPhotoCacheTTL。
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func NewCachedPhotoProvider(inner combinedPhotoProvider, ttl time.Duration) *CachedPhotoProvider {
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return newCachedPhotoProviderWithClock(inner, ttl, nil)
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}
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// newCachedPhotoProviderWithClock 允许注入时钟,仅供测试确定地推进 TTL;now=nil 用真实时钟。
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func newCachedPhotoProviderWithClock(inner combinedPhotoProvider, ttl time.Duration, now func() time.Time) *CachedPhotoProvider {
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if inner == nil {
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return nil
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}
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if ttl <= 0 {
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ttl = DefaultPhotoCacheTTL
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}
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return &CachedPhotoProvider{
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inner: inner,
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cache: readmodelcache.New[photoCacheKey, photoCacheValue](readmodelcache.Config[photoCacheKey, photoCacheValue]{
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MaxEntries: photoCacheMaxEntries,
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TTL: ttl,
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Now: now,
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Clone: clonePhotoCacheValue,
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}),
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}
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}
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// CurrentProfilePhotosKind 是被缓存的热路径：先按 owner 取缓存，仅未命中的 owner 批量查底层。
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func (c *CachedPhotoProvider) CurrentProfilePhotosKind(ctx context.Context, ownerType domain.PeerType, ownerIDs []int64, kind domain.ProfilePhotoKind) (map[int64]domain.ProfilePhotoRef, error) {
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if c == nil {
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return nil, nil
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}
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keys := make([]photoCacheKey, 0, len(ownerIDs))
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for _, id := range ownerIDs {
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keys = append(keys, photoCacheKey{ownerType: ownerType, ownerID: id, kind: kind})
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}
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values, err := c.cache.GetOrLoadBatch(ctx, keys,
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func(photoCacheKey) (int64, bool) { return 0, true }, // 纯 TTL,无版本闸门
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func(ctx context.Context, missing []photoCacheKey) (map[photoCacheKey]photoCacheValue, error) {
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missingIDs := make([]int64, len(missing))
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for i, k := range missing {
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missingIDs[i] = k.ownerID
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}
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refs, err := c.inner.CurrentProfilePhotosKind(ctx, ownerType, missingIDs, kind)
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if err != nil {
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return nil, err
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}
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out := make(map[photoCacheKey]photoCacheValue, len(missing))
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for _, k := range missing {
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ref, has := refs[k.ownerID]
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out[k] = photoCacheValue{ref: ref, has: has}
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}
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return out, nil
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})
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if err != nil {
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return nil, err
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}
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out := make(map[int64]domain.ProfilePhotoRef, len(values))
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for key, v := range values {
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if v.has {
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out[key.ownerID] = v.ref
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}
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}
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return out, nil
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}
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// CurrentProfilePhotos 是非 kind 的回退路径——projectBatch 仅在 provider 不实现
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// ProfilePhotoKindProvider 时才走它，而本装饰器实现了 kind 接口，故生产不会命中此方法；
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// 直接透传，不缓存，保持行为不变。
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func (c *CachedPhotoProvider) CurrentProfilePhotos(ctx context.Context, ownerType domain.PeerType, ownerIDs []int64) (map[int64]domain.ProfilePhotoRef, error) {
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return c.inner.CurrentProfilePhotos(ctx, ownerType, ownerIDs)
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}
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func (c *CachedPhotoProvider) InvalidateOwner(ownerType domain.PeerType, ownerID int64) {
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if c == nil || ownerID == 0 {
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return
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}
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c.cache.Invalidate(
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photoCacheKey{ownerType: ownerType, ownerID: ownerID, kind: domain.ProfilePhotoKindProfile},
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photoCacheKey{ownerType: ownerType, ownerID: ownerID, kind: domain.ProfilePhotoKindFallback},
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)
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}
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func (c *CachedPhotoProvider) FlushReadModelCache() {
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if c == nil {
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return
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}
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c.cache.Flush()
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}
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func clonePhotoCacheValue(v photoCacheValue) photoCacheValue {
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if v.ref.Stripped != nil {
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v.ref.Stripped = append([]byte(nil), v.ref.Stripped...)
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}
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return v
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}
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