97 lines
2.3 KiB
Go
97 lines
2.3 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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"unsafe"
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"code.gitea.io/gitea/modules/nosql"
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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 *levelqueue.UniqueQueue
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conn string
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cfg *BaseConfig
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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}
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q.internal, 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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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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return baseLevelQueueCommon(q.cfg, q.internal, &q.mu).PushItem(ctx, data)
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}
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func (q *baseLevelQueueUnique) PopItem(ctx context.Context) ([]byte, error) {
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return baseLevelQueueCommon(q.cfg, q.internal, &q.mu).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.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.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.Close()
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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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type levelUniqueQueue struct {
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q *levelqueue.Queue
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set *levelqueue.Set
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db *leveldb.DB
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}
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lq := (*levelUniqueQueue)(unsafe.Pointer(q.internal))
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for lq.q.Len() > 0 {
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if _, err := lq.q.LPop(); err != nil {
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return err
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}
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}
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// the "set" must be cleared after the "list" because there is no transaction.
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// it's better to have duplicate items than losing items.
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members, err := lq.set.Members()
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if err != nil {
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return err // seriously corrupted
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}
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for _, v := range members {
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_, _ = lq.set.Remove(v)
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}
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return nil
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}
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