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https://codeberg.org/forgejo/forgejo.git
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84c8ab9fd1
gitea.com experienced the corrupted LevelQueue bug again.
I think the problem is clear now: if the keys in LevelDB went
out-of-sync, the LevelQueue itself doesn't have the ability to recover,
eg:
* LevelQueue.Len() reports 100
* LevelQueue.LPop() reports ErrNotFound = errors.New("no key found")
So it needs to dive into the LevelDB to remove all keys to recover the
corrupted LevelQueue.
More comments are in TestCorruptedLevelQueue.
88 lines
2.5 KiB
Go
88 lines
2.5 KiB
Go
// Copyright 2023 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package queue
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import (
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"context"
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"sync"
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"sync/atomic"
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"code.gitea.io/gitea/modules/nosql"
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"code.gitea.io/gitea/modules/queue/lqinternal"
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"gitea.com/lunny/levelqueue"
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"github.com/syndtr/goleveldb/leveldb"
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)
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type baseLevelQueueUnique struct {
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internal atomic.Pointer[levelqueue.UniqueQueue]
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conn string
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cfg *BaseConfig
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db *leveldb.DB
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mu sync.Mutex // the levelqueue.UniqueQueue is not thread-safe, there is no mutex protecting the underlying queue&set together
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}
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var _ baseQueue = (*baseLevelQueueUnique)(nil)
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func newBaseLevelQueueUnique(cfg *BaseConfig) (baseQueue, error) {
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conn, db, err := prepareLevelDB(cfg)
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if err != nil {
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return nil, err
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}
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q := &baseLevelQueueUnique{conn: conn, cfg: cfg, db: db}
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lq, err := levelqueue.NewUniqueQueue(db, []byte(cfg.QueueFullName), []byte(cfg.SetFullName), false)
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if err != nil {
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return nil, err
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}
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q.internal.Store(lq)
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return q, nil
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}
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func (q *baseLevelQueueUnique) PushItem(ctx context.Context, data []byte) error {
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c := baseLevelQueueCommon(q.cfg, &q.mu, func() baseLevelQueuePushPoper { return q.internal.Load() })
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return c.PushItem(ctx, data)
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}
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func (q *baseLevelQueueUnique) PopItem(ctx context.Context) ([]byte, error) {
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c := baseLevelQueueCommon(q.cfg, &q.mu, func() baseLevelQueuePushPoper { return q.internal.Load() })
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return c.PopItem(ctx)
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}
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func (q *baseLevelQueueUnique) HasItem(ctx context.Context, data []byte) (bool, error) {
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q.mu.Lock()
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defer q.mu.Unlock()
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return q.internal.Load().Has(data)
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}
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func (q *baseLevelQueueUnique) Len(ctx context.Context) (int, error) {
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q.mu.Lock()
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defer q.mu.Unlock()
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return int(q.internal.Load().Len()), nil
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}
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func (q *baseLevelQueueUnique) Close() error {
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q.mu.Lock()
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defer q.mu.Unlock()
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err := q.internal.Load().Close()
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q.db = nil // the db is not managed by us, it's managed by the nosql manager
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_ = nosql.GetManager().CloseLevelDB(q.conn)
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return err
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}
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func (q *baseLevelQueueUnique) RemoveAll(ctx context.Context) error {
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q.mu.Lock()
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defer q.mu.Unlock()
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lqinternal.RemoveLevelQueueKeys(q.db, []byte(q.cfg.QueueFullName))
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lqinternal.RemoveLevelQueueKeys(q.db, []byte(q.cfg.SetFullName))
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lq, err := levelqueue.NewUniqueQueue(q.db, []byte(q.cfg.QueueFullName), []byte(q.cfg.SetFullName), false)
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if err != nil {
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return err
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}
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old := q.internal.Load()
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q.internal.Store(lq)
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_ = old.Close() // Not ideal for concurrency. Luckily, the levelqueue only sets its db=nil because it doesn't manage the db, so far so good
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return nil
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}
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