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// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package queue
import (
"context"
"sync"
"unsafe"
"code.gitea.io/gitea/modules/nosql"
"gitea.com/lunny/levelqueue"
"github.com/syndtr/goleveldb/leveldb"
)
type baseLevelQueueUnique struct {
internal *levelqueue.UniqueQueue
conn string
cfg *BaseConfig
mu sync.Mutex // the levelqueue.UniqueQueue is not thread-safe, there is no mutex protecting the underlying queue&set together
}
var _ baseQueue = (*baseLevelQueueUnique)(nil)
func newBaseLevelQueueUnique(cfg *BaseConfig) (baseQueue, error) {
conn, db, err := prepareLevelDB(cfg)
if err != nil {
return nil, err
}
q := &baseLevelQueueUnique{conn: conn, cfg: cfg}
q.internal, err = levelqueue.NewUniqueQueue(db, []byte(cfg.QueueFullName), []byte(cfg.SetFullName), false)
if err != nil {
return nil, err
}
return q, nil
}
func (q *baseLevelQueueUnique) PushItem(ctx context.Context, data []byte) error {
return baseLevelQueueCommon(q.cfg, q.internal, &q.mu).PushItem(ctx, data)
}
func (q *baseLevelQueueUnique) PopItem(ctx context.Context) ([]byte, error) {
return baseLevelQueueCommon(q.cfg, q.internal, &q.mu).PopItem(ctx)
}
func (q *baseLevelQueueUnique) HasItem(ctx context.Context, data []byte) (bool, error) {
q.mu.Lock()
defer q.mu.Unlock()
return q.internal.Has(data)
}
func (q *baseLevelQueueUnique) Len(ctx context.Context) (int, error) {
q.mu.Lock()
defer q.mu.Unlock()
return int(q.internal.Len()), nil
}
func (q *baseLevelQueueUnique) Close() error {
q.mu.Lock()
defer q.mu.Unlock()
err := q.internal.Close()
_ = nosql.GetManager().CloseLevelDB(q.conn)
return err
}
func (q *baseLevelQueueUnique) RemoveAll(ctx context.Context) error {
q.mu.Lock()
defer q.mu.Unlock()
type levelUniqueQueue struct {
q *levelqueue.Queue
set *levelqueue.Set
db *leveldb.DB
}
lq := (*levelUniqueQueue)(unsafe.Pointer(q.internal))
for lq.q.Len() > 0 {
if _, err := lq.q.LPop(); err != nil {
return err
}
}
// the "set" must be cleared after the "list" because there is no transaction.
// it's better to have duplicate items than losing items.
members, err := lq.set.Members()
if err != nil {
return err // seriously corrupted
}
for _, v := range members {
_, _ = lq.set.Remove(v)
}
return nil
}
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