309 lines
11 KiB
Go
309 lines
11 KiB
Go
package postgres
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import (
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"context"
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"encoding/binary"
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"errors"
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"fmt"
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"time"
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"github.com/jackc/pgx/v5"
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"github.com/jackc/pgx/v5/pgconn"
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"github.com/jackc/pgx/v5/pgtype"
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"telesrv/internal/store"
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"telesrv/internal/store/postgres/sqlcgen"
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)
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// AuthKeyStore 用 PostgreSQL 实现 store.AuthKeyStore。
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type AuthKeyStore struct {
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q *sqlcgen.Queries
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db sqlcgen.DBTX
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}
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// NewAuthKeyStore 基于 pgx 连接池（或事务）创建 AuthKeyStore。
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func NewAuthKeyStore(db sqlcgen.DBTX) *AuthKeyStore {
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return &AuthKeyStore{q: sqlcgen.New(db), db: db}
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}
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// Save 实现 store.AuthKeyStore。auth_key_id 以小端解释为 int64 存入 BIGINT；
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// created_at/last_used_at 交由 DB 默认值（now()），故传入的 CreatedAt 不落库。
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func (s *AuthKeyStore) Save(ctx context.Context, k store.AuthKeyData) error {
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if !store.ValidNewAuthKeyProtocolExpiry(k.ExpiresAt) {
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return store.ErrInvalidAuthKeyProtocolExpiry
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}
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tag, err := s.db.Exec(ctx, `
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INSERT INTO auth_keys (auth_key_id, body, server_salt, expires_at)
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VALUES ($1, $2, $3, $4)
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ON CONFLICT (auth_key_id) DO UPDATE
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SET server_salt = EXCLUDED.server_salt,
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last_used_at = now()
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WHERE auth_keys.body = EXCLUDED.body
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AND auth_keys.expires_at = EXCLUDED.expires_at
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`, authKeyIDToInt64(k.ID), k.Value[:], k.ServerSalt, k.ExpiresAt)
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if err != nil {
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return fmt.Errorf("upsert auth key: %w", err)
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}
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if tag.RowsAffected() != 1 {
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return store.ErrAuthKeyProtocolMetadataConflict
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}
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return nil
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}
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// Get 实现 store.AuthKeyStore。不存在时 found=false。读取与 last_used_at touch 是同一条
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// UPDATE ... RETURNING：若 orphan GC 已锁定并删除该行，Get 等待后得到 no rows；若 Get 先
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// 完成，GC 的 cutoff/final predicate 会看到新水位并跳过。这样连接不会在“读到旧 key、尚未
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// 注册进 SessionManager”的窗口被后台清理。
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func (s *AuthKeyStore) Get(ctx context.Context, id [8]byte) (store.AuthKeyData, bool, error) {
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var (
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body []byte
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serverSalt int64
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expiresAt int
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createdAt pgtype.Timestamptz
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layer int
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deviceModel string
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platform string
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systemVersion string
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apiID int
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appVersion string
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)
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err := s.db.QueryRow(ctx, `
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UPDATE auth_keys
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SET last_used_at = now()
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WHERE auth_key_id = $1
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RETURNING auth_key_id, body, server_salt, created_at,
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expires_at, layer, device_model, platform, system_version, api_id, app_version
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`, authKeyIDToInt64(id)).Scan(new(int64), &body, &serverSalt, &createdAt, &expiresAt, &layer, &deviceModel, &platform, &systemVersion, &apiID, &appVersion)
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if err != nil {
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if errors.Is(err, pgx.ErrNoRows) {
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return store.AuthKeyData{}, false, nil
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}
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return store.AuthKeyData{}, false, fmt.Errorf("get auth key: %w", err)
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}
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if len(body) != len(store.AuthKeyData{}.Value) {
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return store.AuthKeyData{}, false, fmt.Errorf("auth key body length = %d, want 256", len(body))
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}
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data := store.AuthKeyData{
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ID: id,
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ServerSalt: serverSalt,
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ExpiresAt: expiresAt,
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Layer: layer,
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DeviceModel: deviceModel,
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Platform: platform,
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SystemVersion: systemVersion,
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APIID: apiID,
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AppVersion: appVersion,
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}
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copy(data.Value[:], body)
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if createdAt.Valid {
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data.CreatedAt = createdAt.Time.Unix()
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}
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return data, true, nil
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}
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const activeAuthKeyHeartbeatBatch = 4096
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// TouchActiveRawAuthKeys refreshes the durable activity lease for raw auth keys currently held by
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// this server instance. Orphan collection is database-global while SessionManager is process-local;
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// without this heartbeat, instance A can collect a long-lived unauthorised key that is active on
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// instance B after its one-time Get touch ages past the retention cutoff.
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//
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// The caller runs this well inside the orphan-retention window and skips collection if a heartbeat
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// fails. Batching keeps the ANY array and one UPDATE bounded at large connection counts.
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func (s *AuthKeyStore) TouchActiveRawAuthKeys(ctx context.Context, ids [][8]byte) error {
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if len(ids) == 0 {
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return nil
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}
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seen := make(map[int64]struct{}, len(ids))
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keyIDs := make([]int64, 0, len(ids))
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for _, id := range ids {
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keyID := authKeyIDToInt64(id)
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if _, duplicate := seen[keyID]; duplicate {
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continue
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}
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seen[keyID] = struct{}{}
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keyIDs = append(keyIDs, keyID)
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}
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for start := 0; start < len(keyIDs); start += activeAuthKeyHeartbeatBatch {
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end := start + activeAuthKeyHeartbeatBatch
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if end > len(keyIDs) {
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end = len(keyIDs)
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}
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batch := keyIDs[start:end]
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tag, err := s.db.Exec(ctx, `
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UPDATE auth_keys
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SET last_used_at = now()
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WHERE auth_key_id = ANY($1::bigint[])`, batch)
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if err != nil {
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return fmt.Errorf("touch active raw auth keys: %w", err)
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}
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if tag.RowsAffected() != int64(len(batch)) {
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return fmt.Errorf(
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"touch active raw auth keys: refreshed %d of %d keys",
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tag.RowsAffected(), len(batch),
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)
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}
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}
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return nil
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}
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func (s *AuthKeyStore) UpdateClientInfo(ctx context.Context, id [8]byte, info store.AuthKeyClientInfo) error {
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if _, err := s.db.Exec(ctx, `
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UPDATE auth_keys
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SET layer = CASE WHEN $2::integer > 0 THEN $2 ELSE layer END,
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device_model = CASE WHEN $3::text <> '' THEN $3 ELSE device_model END,
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platform = CASE WHEN $4::text <> '' THEN $4 ELSE platform END,
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system_version = CASE WHEN $5::text <> '' THEN $5 ELSE system_version END,
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api_id = CASE WHEN $6::integer <> 0 THEN $6 ELSE api_id END,
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app_version = CASE WHEN $7::text <> '' THEN $7 ELSE app_version END
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WHERE auth_key_id = $1
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`, authKeyIDToInt64(id), info.Layer, info.DeviceModel, info.Platform, info.SystemVersion, info.APIID, info.AppVersion); err != nil {
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return fmt.Errorf("update auth key client info: %w", err)
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}
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return nil
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}
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// Delete 实现 store.AuthKeyStore。不存在时静默成功。
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// 手写 SQL 而非 sqlc 生成：避免触碰 sqlcgen 再生成链路。
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//
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// 同时清理把本 key 当作 perm key 的 temp auth key 行：temp_auth_key_bindings.temp_auth_key_id
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// 侧有外键 ON DELETE CASCADE，删除 temp key 会自动清绑定；perm_auth_key_id 侧由
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// RESTRICT FK 防止悬空，因此被踢/销毁 perm key 时必须先把关联 temp key 一并删掉。否则 Web/上传连接用
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// raw temp key 重连时仍能进入 RPC 层，只得到 AUTH_KEY_UNREGISTERED，而不是连接层 404。
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func (s *AuthKeyStore) Delete(ctx context.Context, id [8]byte) error {
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for attempt := 0; attempt < 3; attempt++ {
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err := s.deleteAuthKeyOnce(ctx, id)
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if err == nil {
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return nil
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}
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if !isPermAuthKeyDeleteRace(err) {
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return err
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}
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if _, inTx := s.db.(pgx.Tx); inTx {
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return err
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}
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}
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return fmt.Errorf("delete auth key: permanent-key binding changed during all retries")
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}
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func (s *AuthKeyStore) deleteAuthKeyOnce(ctx context.Context, id [8]byte) error {
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keyID := authKeyIDToInt64(id)
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var touched int
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if err := s.db.QueryRow(ctx, `
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WITH doomed_temp AS MATERIALIZED (
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SELECT temp_auth_key_id
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FROM temp_auth_key_bindings
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WHERE perm_auth_key_id = $1
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), doomed_keys AS MATERIALIZED (
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SELECT $1::bigint AS auth_key_id
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UNION
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SELECT temp_auth_key_id FROM doomed_temp
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), deleted_update_states AS (
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-- update_states intentionally has no auth_keys FK: remove device cursors in the
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-- same statement/transaction as both the permanent and derived temp keys.
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DELETE FROM update_states
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WHERE auth_key_id IN (SELECT auth_key_id FROM doomed_keys)
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RETURNING auth_key_id
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), deleted_temp AS (
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DELETE FROM auth_keys
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WHERE auth_key_id IN (SELECT temp_auth_key_id FROM doomed_temp)
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RETURNING auth_key_id
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), deleted_key AS (
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DELETE FROM auth_keys
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WHERE auth_key_id = $1
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AND (SELECT count(*) FROM deleted_temp) >= 0
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RETURNING auth_key_id
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)
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SELECT
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(SELECT count(*) FROM deleted_update_states)::int +
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(SELECT count(*) FROM deleted_temp)::int +
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(SELECT count(*) FROM deleted_key)::int`, keyID).Scan(&touched); err != nil {
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return fmt.Errorf("delete auth key and temp bindings: %w", err)
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}
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return nil
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}
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const tempAuthKeyPermFKConstraint = "temp_auth_key_bindings_perm_auth_key_id_fkey"
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func isPermAuthKeyDeleteRace(err error) bool {
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var pgErr *pgconn.PgError
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return errors.As(err, &pgErr) &&
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pgErr.Code == "23503" &&
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pgErr.ConstraintName == tempAuthKeyPermFKConstraint
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}
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// DeleteOrphaned 回收握手已落库、但从未形成 authorization/temp binding 且当前没有
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// 活跃物理连接的旧 auth key。last_used_at 与 Get 的 UPDATE ... RETURNING 行锁配对，封住
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// active-key 快照之后新连接开始使用旧 key 的竞态；所有引用条件仍在最终 DELETE 中复核。
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// protected 必须是 SessionManager 的 raw key。
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func (s *AuthKeyStore) DeleteOrphaned(ctx context.Context, olderThan time.Duration, limit int, protected [][8]byte) (int, error) {
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if olderThan <= 0 || limit <= 0 {
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return 0, nil
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}
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if limit > 100000 {
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limit = 100000
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}
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protectedIDs := make([]int64, 0, len(protected))
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for _, id := range protected {
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protectedIDs = append(protectedIDs, authKeyIDToInt64(id))
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}
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var deleted int
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err := s.db.QueryRow(ctx, `
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WITH candidates AS MATERIALIZED (
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SELECT k.auth_key_id
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FROM auth_keys k
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WHERE k.last_used_at < now() - make_interval(secs => $1::double precision)
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AND NOT (k.auth_key_id = ANY($2::bigint[]))
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AND NOT EXISTS (
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SELECT 1 FROM authorizations a WHERE a.auth_key_id = k.auth_key_id
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)
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AND NOT EXISTS (
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SELECT 1
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FROM temp_auth_key_bindings b
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WHERE b.temp_auth_key_id = k.auth_key_id OR b.perm_auth_key_id = k.auth_key_id
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)
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ORDER BY k.last_used_at ASC, k.auth_key_id ASC
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LIMIT $3
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FOR UPDATE OF k SKIP LOCKED
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), deleted_update_states AS (
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-- Historical authorization-only deletion could leave a cursor without an
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-- auth_keys FK. GC owns that stale row once the raw key is proven orphaned.
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DELETE FROM update_states s
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USING candidates c
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WHERE s.auth_key_id = c.auth_key_id
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RETURNING s.auth_key_id
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), deleted_keys AS (
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DELETE FROM auth_keys k
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USING candidates c
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WHERE k.auth_key_id = c.auth_key_id
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AND k.last_used_at < now() - make_interval(secs => $1::double precision)
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AND NOT (k.auth_key_id = ANY($2::bigint[]))
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AND NOT EXISTS (
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SELECT 1 FROM authorizations a WHERE a.auth_key_id = k.auth_key_id
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)
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AND NOT EXISTS (
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SELECT 1
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FROM temp_auth_key_bindings b
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WHERE b.temp_auth_key_id = k.auth_key_id OR b.perm_auth_key_id = k.auth_key_id
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)
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RETURNING k.auth_key_id
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)
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SELECT count(*)::int
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FROM deleted_keys
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CROSS JOIN LATERAL (SELECT count(*) FROM deleted_update_states) AS touched`, olderThan.Seconds(), protectedIDs, limit).Scan(&deleted)
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if err != nil {
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return 0, fmt.Errorf("delete orphaned auth keys: %w", err)
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}
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return deleted, nil
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}
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// authKeyIDToInt64 把 [8]byte 的 auth_key_id 按小端解释为 int64（MTProto 定义即 SHA1 低 64 位）。
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func authKeyIDToInt64(id [8]byte) int64 {
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return int64(binary.LittleEndian.Uint64(id[:]))
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}
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func authKeyIDFromInt64(v int64) [8]byte {
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var id [8]byte
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binary.LittleEndian.PutUint64(id[:], uint64(v))
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return id
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}
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