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// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package queue
import (
"code.gitea.io/gitea/modules/nosql"
"gitea.com/lunny/levelqueue"
)
// LevelUniqueQueueType is the type for level queue
const LevelUniqueQueueType Type = "unique-level"
// LevelUniqueQueueConfiguration is the configuration for a LevelUniqueQueue
type LevelUniqueQueueConfiguration struct {
ByteFIFOQueueConfiguration
DataDir string
ConnectionString string
QueueName string
}
// LevelUniqueQueue implements a disk library queue
type LevelUniqueQueue struct {
*ByteFIFOUniqueQueue
}
// NewLevelUniqueQueue creates a ledis local queue
//
// Please note that this Queue does not guarantee that a particular
// task cannot be processed twice or more at the same time. Uniqueness is
// only guaranteed whilst the task is waiting in the queue.
func NewLevelUniqueQueue(handle HandlerFunc, cfg, exemplar interface{}) (Queue, error) {
configInterface, err := toConfig(LevelUniqueQueueConfiguration{}, cfg)
if err != nil {
return nil, err
}
config := configInterface.(LevelUniqueQueueConfiguration)
if len(config.ConnectionString) == 0 {
config.ConnectionString = config.DataDir
}
byteFIFO, err := NewLevelUniqueQueueByteFIFO(config.ConnectionString, config.QueueName)
if err != nil {
return nil, err
}
byteFIFOQueue, err := NewByteFIFOUniqueQueue(LevelUniqueQueueType, byteFIFO, handle, config.ByteFIFOQueueConfiguration, exemplar)
if err != nil {
return nil, err
}
queue := &LevelUniqueQueue{
ByteFIFOUniqueQueue: byteFIFOQueue,
}
queue.qid = GetManager().Add(queue, LevelUniqueQueueType, config, exemplar)
return queue, nil
}
var _ UniqueByteFIFO = &LevelUniqueQueueByteFIFO{}
// LevelUniqueQueueByteFIFO represents a ByteFIFO formed from a LevelUniqueQueue
type LevelUniqueQueueByteFIFO struct {
internal *levelqueue.UniqueQueue
connection string
}
// NewLevelUniqueQueueByteFIFO creates a new ByteFIFO formed from a LevelUniqueQueue
func NewLevelUniqueQueueByteFIFO(connection, prefix string) (*LevelUniqueQueueByteFIFO, error) {
db, err := nosql.GetManager().GetLevelDB(connection)
if err != nil {
return nil, err
}
internal, err := levelqueue.NewUniqueQueue(db, []byte(prefix), []byte(prefix+"-unique"), false)
if err != nil {
return nil, err
}
return &LevelUniqueQueueByteFIFO{
connection: connection,
internal: internal,
}, nil
}
// PushFunc pushes data to the end of the fifo and calls the callback if it is added
func (fifo *LevelUniqueQueueByteFIFO) PushFunc(data []byte, fn func() error) error {
return fifo.internal.LPushFunc(data, fn)
}
// Pop pops data from the start of the fifo
func (fifo *LevelUniqueQueueByteFIFO) Pop() ([]byte, error) {
data, err := fifo.internal.RPop()
if err != nil && err != levelqueue.ErrNotFound {
return nil, err
}
return data, nil
}
// Len returns the length of the fifo
func (fifo *LevelUniqueQueueByteFIFO) Len() int64 {
return fifo.internal.Len()
}
// Has returns whether the fifo contains this data
func (fifo *LevelUniqueQueueByteFIFO) Has(data []byte) (bool, error) {
return fifo.internal.Has(data)
}
// Close this fifo
func (fifo *LevelUniqueQueueByteFIFO) Close() error {
err := fifo.internal.Close()
_ = nosql.GetManager().CloseLevelDB(fifo.connection)
return err
}
func init() {
queuesMap[LevelUniqueQueueType] = NewLevelUniqueQueue
}
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