470 lines
13 KiB
Go
470 lines
13 KiB
Go
package userprojection
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import (
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"context"
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"fmt"
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"sync"
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"time"
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"golang.org/x/sync/singleflight"
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"telesrv/internal/domain"
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"telesrv/internal/store"
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)
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const (
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// DefaultContactProjectionCacheTTL is a safety bound for out-of-band writes.
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// Normal correctness relies on write-path invalidation, not natural expiry.
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DefaultContactProjectionCacheTTL = 24 * time.Hour
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contactSnapshotMaxViewers = 4096
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contactReverseSnapshotOwnerCap = 16
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contactPersonalPhotoSnapshotCap = 4096
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)
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type contactAccountSnapshot struct {
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contacts map[int64]domain.Contact
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ordered []domain.Contact
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hash int64
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expireAt time.Time
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}
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type personalPhotoSnapshot struct {
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refs map[int64]domain.ProfilePhotoRef
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expireAt time.Time
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}
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type contactSnapshotLoadResult struct {
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snap contactAccountSnapshot
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stored bool
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}
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type personalPhotoSnapshotLoadResult struct {
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snap personalPhotoSnapshot
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stored bool
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}
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// CachedContactStore wraps ContactStore with account-level read model snapshots.
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//
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// Contact data is low-churn and high-read: TDesktop repeatedly asks for the same
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// viewer-scoped user projection while switching dialogs. Pair-level short TTL
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// caching still lets every RPC plan new SQL for another pair; this cache loads a
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// viewer's whole contact projection once, filters it in memory, and relies on
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// contact write methods to invalidate the affected account snapshots.
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type CachedContactStore struct {
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inner store.ContactStore
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ttl time.Duration
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now func() time.Time
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mu sync.RWMutex
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contacts map[int64]contactAccountSnapshot
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personalPhotos map[int64]personalPhotoSnapshot
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epoch uint64
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sf singleflight.Group
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}
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func NewCachedContactStore(inner store.ContactStore, ttl time.Duration) *CachedContactStore {
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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 = DefaultContactProjectionCacheTTL
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}
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return &CachedContactStore{
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inner: inner,
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ttl: ttl,
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now: time.Now,
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contacts: make(map[int64]contactAccountSnapshot, 1024),
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personalPhotos: make(map[int64]personalPhotoSnapshot, 1024),
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}
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}
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func (c *CachedContactStore) ListByUser(ctx context.Context, userID int64) (domain.ContactList, error) {
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if userID == 0 {
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return domain.ContactList{}, nil
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}
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snap, err := c.contactSnapshot(ctx, userID)
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if err != nil {
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return domain.ContactList{}, err
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}
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return domain.ContactList{Contacts: cloneCachedContacts(snap.ordered), Hash: snap.hash}, nil
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}
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func (c *CachedContactStore) Get(ctx context.Context, userID, contactUserID int64) (domain.Contact, bool, error) {
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if userID == 0 || contactUserID == 0 {
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return domain.Contact{}, false, nil
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}
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got, err := c.GetMany(ctx, userID, []int64{contactUserID})
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if err != nil {
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return domain.Contact{}, false, err
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}
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contact, ok := got[contactUserID]
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return contact, ok, nil
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}
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func (c *CachedContactStore) GetMany(ctx context.Context, userID int64, contactUserIDs []int64) (map[int64]domain.Contact, error) {
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out := make(map[int64]domain.Contact, len(contactUserIDs))
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if userID == 0 || len(contactUserIDs) == 0 {
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return out, nil
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}
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snap, err := c.contactSnapshot(ctx, userID)
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if err != nil {
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return nil, err
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}
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for _, ownerID := range contactUserIDs {
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if ownerID == 0 {
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continue
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}
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if contact, ok := snap.contacts[ownerID]; ok {
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out[ownerID] = cloneCachedContact(contact)
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}
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}
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return out, nil
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}
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func (c *CachedContactStore) GetReverseContacts(ctx context.Context, userID int64, ownerUserIDs []int64) (map[int64]domain.Contact, error) {
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out := make(map[int64]domain.Contact, len(ownerUserIDs))
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if userID == 0 || len(ownerUserIDs) == 0 {
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return out, nil
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}
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owners := dedupContactIDs(ownerUserIDs)
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if len(owners) == 0 {
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return out, nil
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}
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if len(owners) > contactReverseSnapshotOwnerCap {
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// Large fan-out should keep using the store's set query until a dedicated
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// reverse-contact read model exists; loading hundreds of full contact
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// lists would be worse than one batched SQL.
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return c.inner.GetReverseContacts(ctx, userID, owners)
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}
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for _, ownerID := range owners {
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snap, err := c.contactSnapshot(ctx, ownerID)
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if err != nil {
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return nil, err
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}
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if contact, ok := snap.contacts[userID]; ok {
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out[ownerID] = cloneCachedContact(contact)
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}
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}
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return out, nil
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}
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func (c *CachedContactStore) Upsert(ctx context.Context, userID int64, input domain.ContactInput) (domain.Contact, error) {
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contact, err := c.inner.Upsert(ctx, userID, input)
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if err == nil {
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c.InvalidateViewers(userID, input.ContactUserID)
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}
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return contact, err
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}
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func (c *CachedContactStore) UpsertMany(ctx context.Context, userID int64, inputs []domain.ContactInput) ([]domain.Contact, error) {
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contacts, err := c.inner.UpsertMany(ctx, userID, inputs)
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if err == nil {
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ids := make([]int64, 0, len(inputs)+1)
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ids = append(ids, userID)
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for _, input := range inputs {
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ids = append(ids, input.ContactUserID)
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}
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c.InvalidateViewers(ids...)
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}
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return contacts, err
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}
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func (c *CachedContactStore) UpdateNote(ctx context.Context, userID, contactUserID int64, note string, entities []domain.MessageEntity) (domain.Contact, bool, error) {
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contact, found, err := c.inner.UpdateNote(ctx, userID, contactUserID, note, entities)
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if err == nil {
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c.InvalidateViewers(userID)
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}
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return contact, found, err
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}
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func (c *CachedContactStore) SetCloseFriends(ctx context.Context, userID int64, contactUserIDs []int64) (domain.CloseFriendsEditResult, error) {
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res, err := c.inner.SetCloseFriends(ctx, userID, contactUserIDs)
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if err == nil {
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c.InvalidateViewers(userID)
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}
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return res, err
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}
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func (c *CachedContactStore) SetPersonalPhoto(ctx context.Context, userID, contactUserID int64, photoID int64, date int) (domain.Contact, bool, error) {
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contact, found, err := c.inner.SetPersonalPhoto(ctx, userID, contactUserID, photoID, date)
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if err == nil {
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c.InvalidateViewers(userID)
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}
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return contact, found, err
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}
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func (c *CachedContactStore) PersonalPhotos(ctx context.Context, userID int64, contactUserIDs []int64) (map[int64]domain.ProfilePhotoRef, error) {
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out := make(map[int64]domain.ProfilePhotoRef, len(contactUserIDs))
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if userID == 0 || len(contactUserIDs) == 0 {
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return out, nil
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}
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snap, err := c.personalPhotoSnapshot(ctx, userID)
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if err != nil {
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return nil, err
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}
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for _, ownerID := range contactUserIDs {
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if ownerID == 0 {
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continue
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}
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if ref, ok := snap.refs[ownerID]; ok {
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out[ownerID] = cloneCachedProfilePhotoRef(ref)
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}
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}
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return out, nil
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}
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func (c *CachedContactStore) Delete(ctx context.Context, userID int64, contactUserIDs []int64) (int, error) {
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count, err := c.inner.Delete(ctx, userID, contactUserIDs)
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if err == nil {
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ids := make([]int64, 0, len(contactUserIDs)+1)
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ids = append(ids, userID)
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ids = append(ids, contactUserIDs...)
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c.InvalidateViewers(ids...)
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}
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return count, err
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}
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func (c *CachedContactStore) Block(ctx context.Context, userID, blockedUserID int64, date int) (bool, error) {
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changed, err := c.inner.Block(ctx, userID, blockedUserID, date)
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if err == nil {
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c.InvalidateViewers(userID, blockedUserID)
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}
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return changed, err
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}
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func (c *CachedContactStore) Unblock(ctx context.Context, userID, blockedUserID int64) (bool, error) {
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changed, err := c.inner.Unblock(ctx, userID, blockedUserID)
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if err == nil {
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c.InvalidateViewers(userID, blockedUserID)
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}
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return changed, err
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}
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func (c *CachedContactStore) IsBlocked(ctx context.Context, userID, blockedUserID int64) (bool, error) {
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return c.inner.IsBlocked(ctx, userID, blockedUserID)
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}
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func (c *CachedContactStore) ListBlocked(ctx context.Context, userID int64, offset, limit int) (domain.BlockedContactList, error) {
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return c.inner.ListBlocked(ctx, userID, offset, limit)
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}
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func (c *CachedContactStore) contactSnapshot(ctx context.Context, userID int64) (contactAccountSnapshot, error) {
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for {
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if snap, ok := c.lookupContactSnapshot(userID, c.now()); ok {
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return snap, nil
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}
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v, err, _ := c.sf.Do(fmt.Sprintf("contact:%d", userID), func() (any, error) {
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now := c.now()
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if snap, ok := c.lookupContactSnapshot(userID, now); ok {
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return contactSnapshotLoadResult{snap: snap, stored: true}, nil
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}
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loadEpoch := c.cacheEpoch()
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list, err := c.inner.ListByUser(ctx, userID)
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if err != nil {
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return contactSnapshotLoadResult{}, err
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}
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snap := buildContactAccountSnapshot(list, now.Add(c.ttl))
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c.mu.Lock()
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stored := c.epoch == loadEpoch
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if stored {
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if len(c.contacts) >= contactSnapshotMaxViewers {
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c.contacts = make(map[int64]contactAccountSnapshot, 1024)
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c.personalPhotos = make(map[int64]personalPhotoSnapshot, 1024)
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}
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c.contacts[userID] = snap
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}
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c.mu.Unlock()
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return contactSnapshotLoadResult{snap: snap, stored: stored}, nil
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})
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if err != nil {
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return contactAccountSnapshot{}, err
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}
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result := v.(contactSnapshotLoadResult)
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if result.stored {
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return result.snap, nil
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}
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if err := ctx.Err(); err != nil {
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return contactAccountSnapshot{}, err
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}
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}
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}
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func (c *CachedContactStore) lookupContactSnapshot(userID int64, now time.Time) (contactAccountSnapshot, bool) {
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c.mu.RLock()
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snap, ok := c.contacts[userID]
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c.mu.RUnlock()
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if !ok || !snap.expireAt.After(now) {
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if ok {
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c.InvalidateViewers(userID)
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}
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return contactAccountSnapshot{}, false
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}
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return snap, true
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}
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func (c *CachedContactStore) personalPhotoSnapshot(ctx context.Context, userID int64) (personalPhotoSnapshot, error) {
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for {
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if snap, ok := c.lookupPersonalPhotoSnapshot(userID, c.now()); ok {
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return snap, nil
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}
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v, err, _ := c.sf.Do(fmt.Sprintf("contact-photo:%d", userID), func() (any, error) {
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now := c.now()
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if snap, ok := c.lookupPersonalPhotoSnapshot(userID, now); ok {
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return personalPhotoSnapshotLoadResult{snap: snap, stored: true}, nil
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}
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loadEpoch := c.cacheEpoch()
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contacts, err := c.contactSnapshot(ctx, userID)
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if err != nil {
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return personalPhotoSnapshotLoadResult{}, err
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}
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ids := make([]int64, 0, len(contacts.contacts))
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for id := range contacts.contacts {
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ids = append(ids, id)
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}
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refs := map[int64]domain.ProfilePhotoRef{}
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if len(ids) > 0 {
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refs, err = c.inner.PersonalPhotos(ctx, userID, ids)
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if err != nil {
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return personalPhotoSnapshotLoadResult{}, err
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}
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}
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snap := personalPhotoSnapshot{refs: cloneCachedProfilePhotoRefs(refs), expireAt: now.Add(c.ttl)}
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c.mu.Lock()
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stored := c.epoch == loadEpoch
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if stored {
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if len(c.personalPhotos) >= contactPersonalPhotoSnapshotCap {
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c.personalPhotos = make(map[int64]personalPhotoSnapshot, 1024)
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}
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c.personalPhotos[userID] = snap
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}
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c.mu.Unlock()
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return personalPhotoSnapshotLoadResult{snap: snap, stored: stored}, nil
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})
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if err != nil {
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return personalPhotoSnapshot{}, err
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}
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result := v.(personalPhotoSnapshotLoadResult)
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if result.stored {
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return result.snap, nil
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}
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if err := ctx.Err(); err != nil {
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return personalPhotoSnapshot{}, err
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}
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}
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}
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func (c *CachedContactStore) lookupPersonalPhotoSnapshot(userID int64, now time.Time) (personalPhotoSnapshot, bool) {
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c.mu.RLock()
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snap, ok := c.personalPhotos[userID]
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c.mu.RUnlock()
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if !ok || !snap.expireAt.After(now) {
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if ok {
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c.InvalidateViewers(userID)
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}
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return personalPhotoSnapshot{}, false
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}
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return snap, true
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}
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func (c *CachedContactStore) InvalidateViewers(ids ...int64) {
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if c == nil || len(ids) == 0 {
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return
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}
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c.mu.Lock()
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c.epoch++
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for _, id := range ids {
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if id == 0 {
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continue
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}
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delete(c.contacts, id)
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delete(c.personalPhotos, id)
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}
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c.mu.Unlock()
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}
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func (c *CachedContactStore) FlushReadModelCache() {
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if c == nil {
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return
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}
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c.mu.Lock()
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c.epoch++
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c.contacts = make(map[int64]contactAccountSnapshot, 1024)
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c.personalPhotos = make(map[int64]personalPhotoSnapshot, 1024)
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c.mu.Unlock()
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}
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func (c *CachedContactStore) cacheEpoch() uint64 {
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c.mu.RLock()
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epoch := c.epoch
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c.mu.RUnlock()
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return epoch
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}
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func buildContactAccountSnapshot(list domain.ContactList, expireAt time.Time) contactAccountSnapshot {
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contacts := make(map[int64]domain.Contact, len(list.Contacts))
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ordered := make([]domain.Contact, 0, len(list.Contacts))
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for _, contact := range list.Contacts {
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if contact.User.ID == 0 {
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continue
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}
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clone := cloneCachedContact(contact)
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contacts[clone.User.ID] = clone
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ordered = append(ordered, clone)
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}
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return contactAccountSnapshot{contacts: contacts, ordered: ordered, hash: list.Hash, expireAt: expireAt}
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}
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func dedupContactIDs(ids []int64) []int64 {
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seen := make(map[int64]struct{}, len(ids))
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out := make([]int64, 0, len(ids))
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for _, id := range ids {
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if id == 0 {
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continue
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}
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if _, ok := seen[id]; ok {
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continue
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}
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seen[id] = struct{}{}
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out = append(out, id)
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}
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return out
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}
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func cloneCachedContacts(in []domain.Contact) []domain.Contact {
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out := make([]domain.Contact, len(in))
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for i := range in {
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out[i] = cloneCachedContact(in[i])
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}
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return out
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}
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func cloneCachedContact(in domain.Contact) domain.Contact {
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in.User = cloneCachedUser(in.User)
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if in.NoteEntities != nil {
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in.NoteEntities = append([]domain.MessageEntity(nil), in.NoteEntities...)
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}
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return in
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}
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func cloneCachedUser(in domain.User) domain.User {
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if in.PhotoStripped != nil {
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in.PhotoStripped = append([]byte(nil), in.PhotoStripped...)
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}
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return in
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}
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func cloneCachedProfilePhotoRefs(in map[int64]domain.ProfilePhotoRef) map[int64]domain.ProfilePhotoRef {
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out := make(map[int64]domain.ProfilePhotoRef, len(in))
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for id, ref := range in {
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out[id] = cloneCachedProfilePhotoRef(ref)
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}
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return out
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}
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func cloneCachedProfilePhotoRef(in domain.ProfilePhotoRef) domain.ProfilePhotoRef {
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if in.Stripped != nil {
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in.Stripped = append([]byte(nil), in.Stripped...)
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}
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return in
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}
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