225 lines
7.0 KiB
Go
225 lines
7.0 KiB
Go
package service
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import (
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"context"
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"fmt"
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"log/slog"
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"strconv"
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"strings"
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"sync"
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"time"
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)
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// OAuthRefreshExecutor 各平台实现的 OAuth 刷新执行器
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// TokenRefresher 接口的超集：增加了 CacheKey 方法用于分布式锁
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type OAuthRefreshExecutor interface {
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TokenRefresher
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// CacheKey 返回用于分布式锁的缓存键（与 TokenProvider 使用的一致）
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CacheKey(account *Account) string
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}
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const defaultRefreshLockTTL = 60 * time.Second
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// OAuthRefreshResult 统一刷新结果
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type OAuthRefreshResult struct {
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Refreshed bool // 实际执行了刷新
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NewCredentials map[string]any // 刷新后的 credentials（nil 表示未刷新）
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Account *Account // 从 DB 重新读取的最新 account
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LockHeld bool // 锁被其他 worker 持有（未执行刷新）
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}
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// OAuthRefreshAPI 统一的 OAuth Token 刷新入口
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// 封装分布式锁、进程内互斥锁、DB 重读、已刷新检查、竞争恢复等通用逻辑
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type OAuthRefreshAPI struct {
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accountRepo AccountRepository
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tokenCache GeminiTokenCache // 可选，nil = 无分布式锁
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lockTTL time.Duration
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localLocks sync.Map // key: cacheKey string -> value: *sync.Mutex
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}
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// NewOAuthRefreshAPI 创建统一刷新 API
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// 可选传入 lockTTL 覆盖默认的 60s 分布式锁 TTL
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func NewOAuthRefreshAPI(accountRepo AccountRepository, tokenCache GeminiTokenCache, lockTTL ...time.Duration) *OAuthRefreshAPI {
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ttl := defaultRefreshLockTTL
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if len(lockTTL) > 0 && lockTTL[0] > 0 {
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ttl = lockTTL[0]
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}
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return &OAuthRefreshAPI{
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accountRepo: accountRepo,
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tokenCache: tokenCache,
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lockTTL: ttl,
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}
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}
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// getLocalLock 返回指定 cacheKey 的进程内互斥锁
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func (api *OAuthRefreshAPI) getLocalLock(cacheKey string) *sync.Mutex {
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actual, _ := api.localLocks.LoadOrStore(cacheKey, &sync.Mutex{})
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mu, ok := actual.(*sync.Mutex)
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if !ok {
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mu = &sync.Mutex{}
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api.localLocks.Store(cacheKey, mu)
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}
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return mu
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}
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// RefreshIfNeeded 在分布式锁保护下按需刷新 OAuth token
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//
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// 流程:
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// 1. 获取分布式锁
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// 2. 从 DB 重读最新 account（防止使用过时的 refresh_token）
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// 3. 二次检查是否仍需刷新
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// 4. 调用 executor.Refresh() 执行平台特定刷新逻辑
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// 5. 设置 _token_version + 更新 DB
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// 6. 释放锁
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func (api *OAuthRefreshAPI) RefreshIfNeeded(
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ctx context.Context,
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account *Account,
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executor OAuthRefreshExecutor,
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refreshWindow time.Duration,
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) (*OAuthRefreshResult, error) {
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cacheKey := executor.CacheKey(account)
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// 0. 获取进程内互斥锁（防止同一进程内的并发刷新竞争）
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localMu := api.getLocalLock(cacheKey)
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localMu.Lock()
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defer localMu.Unlock()
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// 1. 获取分布式锁
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lockAcquired := false
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if api.tokenCache != nil {
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acquired, lockErr := api.tokenCache.AcquireRefreshLock(ctx, cacheKey, api.lockTTL)
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if lockErr != nil {
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// Redis 错误，降级为无锁刷新（进程内互斥锁仍生效）
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slog.Warn("oauth_refresh_lock_failed_degraded",
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"account_id", account.ID,
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"cache_key", cacheKey,
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"error", lockErr,
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)
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} else if !acquired {
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// 锁被其他 worker 持有
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return &OAuthRefreshResult{LockHeld: true}, nil
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} else {
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lockAcquired = true
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defer func() { _ = api.tokenCache.ReleaseRefreshLock(ctx, cacheKey) }()
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}
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}
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// 2. 从 DB 重读最新 account（锁保护下，确保使用最新的 refresh_token）
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freshAccount, err := api.accountRepo.GetByID(ctx, account.ID)
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if err != nil {
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slog.Warn("oauth_refresh_db_reread_failed",
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"account_id", account.ID,
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"error", err,
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)
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// 降级使用传入的 account
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freshAccount = account
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} else if freshAccount == nil {
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freshAccount = account
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}
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// 3. 二次检查是否仍需刷新（另一条路径可能已刷新）
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if !executor.NeedsRefresh(freshAccount, refreshWindow) {
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return &OAuthRefreshResult{
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Account: freshAccount,
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}, nil
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}
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// 4. 执行平台特定刷新逻辑
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newCredentials, refreshErr := executor.Refresh(ctx, freshAccount)
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if refreshErr != nil {
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// 竞争恢复：invalid_grant 可能是另一个 worker 已消费了旧 refresh_token
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// 重新读取 DB，如果 refresh_token 已更新则说明是竞争，返回成功
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if isInvalidGrantError(refreshErr) {
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if recoveredAccount, recovered := api.tryRecoverFromRefreshRace(ctx, freshAccount); recovered {
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slog.Info("oauth_refresh_race_recovered",
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"account_id", freshAccount.ID,
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"platform", freshAccount.Platform,
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)
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return &OAuthRefreshResult{
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Account: recoveredAccount,
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}, nil
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}
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}
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return nil, refreshErr
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}
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// 5. 设置版本号 + 更新 DB
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if newCredentials != nil {
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newCredentials["_token_version"] = time.Now().UnixMilli()
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if updateErr := persistAccountCredentials(ctx, api.accountRepo, freshAccount, newCredentials); updateErr != nil {
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slog.Error("oauth_refresh_update_failed",
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"account_id", freshAccount.ID,
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"error", updateErr,
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)
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return nil, fmt.Errorf("oauth refresh succeeded but DB update failed: %w", updateErr)
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}
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}
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_ = lockAcquired // suppress unused warning when tokenCache is nil
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return &OAuthRefreshResult{
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Refreshed: true,
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NewCredentials: newCredentials,
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Account: freshAccount,
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}, nil
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}
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// isInvalidGrantError 检查错误是否为 invalid_grant
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func isInvalidGrantError(err error) bool {
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return err != nil && strings.Contains(strings.ToLower(err.Error()), "invalid_grant")
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}
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// tryRecoverFromRefreshRace 在 invalid_grant 错误后尝试竞争恢复
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// 重新读取 DB，如果 refresh_token 已改变（说明另一个 worker 成功刷新），则返回更新后的 account
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func (api *OAuthRefreshAPI) tryRecoverFromRefreshRace(ctx context.Context, usedAccount *Account) (*Account, bool) {
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if api.accountRepo == nil {
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return nil, false
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}
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reReadAccount, err := api.accountRepo.GetByID(ctx, usedAccount.ID)
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if err != nil || reReadAccount == nil {
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return nil, false
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}
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usedRT := usedAccount.GetCredential("refresh_token")
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currentRT := reReadAccount.GetCredential("refresh_token")
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if usedRT == "" || currentRT == "" {
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return nil, false
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}
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// refresh_token 不同 → 另一个 worker 已成功刷新
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if usedRT != currentRT {
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return reReadAccount, true
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}
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return nil, false
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}
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// MergeCredentials 将旧 credentials 中不存在于新 map 的字段保留到新 map 中
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func MergeCredentials(oldCreds, newCreds map[string]any) map[string]any {
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if newCreds == nil {
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newCreds = make(map[string]any)
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}
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for k, v := range oldCreds {
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if _, exists := newCreds[k]; !exists {
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newCreds[k] = v
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}
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}
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return newCreds
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}
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// BuildClaudeAccountCredentials 为 Claude 平台构建 OAuth credentials map
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// 消除 Claude 平台没有 BuildAccountCredentials 方法的问题
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func BuildClaudeAccountCredentials(tokenInfo *TokenInfo) map[string]any {
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creds := map[string]any{
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"access_token": tokenInfo.AccessToken,
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"token_type": tokenInfo.TokenType,
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"expires_in": strconv.FormatInt(tokenInfo.ExpiresIn, 10),
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"expires_at": strconv.FormatInt(tokenInfo.ExpiresAt, 10),
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}
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if tokenInfo.RefreshToken != "" {
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creds["refresh_token"] = tokenInfo.RefreshToken
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}
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if tokenInfo.Scope != "" {
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creds["scope"] = tokenInfo.Scope
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}
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return creds
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}
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