mirror of
https://codeberg.org/forgejo/forgejo
synced 2024-12-05 02:54:46 +01:00
133 lines
3.5 KiB
Go
133 lines
3.5 KiB
Go
|
// Copyright 2020 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 (
|
||
|
"context"
|
||
|
"fmt"
|
||
|
"sync"
|
||
|
|
||
|
"code.gitea.io/gitea/modules/log"
|
||
|
)
|
||
|
|
||
|
// ChannelUniqueQueueType is the type for channel queue
|
||
|
const ChannelUniqueQueueType Type = "unique-channel"
|
||
|
|
||
|
// ChannelUniqueQueueConfiguration is the configuration for a ChannelUniqueQueue
|
||
|
type ChannelUniqueQueueConfiguration ChannelQueueConfiguration
|
||
|
|
||
|
// ChannelUniqueQueue implements UniqueQueue
|
||
|
//
|
||
|
// It is basically a thin wrapper around a WorkerPool but keeps a store of
|
||
|
// what has been pushed within a table.
|
||
|
//
|
||
|
// 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.
|
||
|
type ChannelUniqueQueue struct {
|
||
|
*WorkerPool
|
||
|
lock sync.Mutex
|
||
|
table map[Data]bool
|
||
|
exemplar interface{}
|
||
|
workers int
|
||
|
name string
|
||
|
}
|
||
|
|
||
|
// NewChannelUniqueQueue create a memory channel queue
|
||
|
func NewChannelUniqueQueue(handle HandlerFunc, cfg, exemplar interface{}) (Queue, error) {
|
||
|
configInterface, err := toConfig(ChannelUniqueQueueConfiguration{}, cfg)
|
||
|
if err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
config := configInterface.(ChannelUniqueQueueConfiguration)
|
||
|
if config.BatchLength == 0 {
|
||
|
config.BatchLength = 1
|
||
|
}
|
||
|
queue := &ChannelUniqueQueue{
|
||
|
table: map[Data]bool{},
|
||
|
exemplar: exemplar,
|
||
|
workers: config.Workers,
|
||
|
name: config.Name,
|
||
|
}
|
||
|
queue.WorkerPool = NewWorkerPool(func(data ...Data) {
|
||
|
for _, datum := range data {
|
||
|
queue.lock.Lock()
|
||
|
delete(queue.table, datum)
|
||
|
queue.lock.Unlock()
|
||
|
handle(datum)
|
||
|
}
|
||
|
}, config.WorkerPoolConfiguration)
|
||
|
|
||
|
queue.qid = GetManager().Add(queue, ChannelUniqueQueueType, config, exemplar)
|
||
|
return queue, nil
|
||
|
}
|
||
|
|
||
|
// Run starts to run the queue
|
||
|
func (q *ChannelUniqueQueue) Run(atShutdown, atTerminate func(context.Context, func())) {
|
||
|
atShutdown(context.Background(), func() {
|
||
|
log.Warn("ChannelUniqueQueue: %s is not shutdownable!", q.name)
|
||
|
})
|
||
|
atTerminate(context.Background(), func() {
|
||
|
log.Warn("ChannelUniqueQueue: %s is not terminatable!", q.name)
|
||
|
})
|
||
|
log.Debug("ChannelUniqueQueue: %s Starting", q.name)
|
||
|
go func() {
|
||
|
_ = q.AddWorkers(q.workers, 0)
|
||
|
}()
|
||
|
}
|
||
|
|
||
|
// Push will push data into the queue if the data is not already in the queue
|
||
|
func (q *ChannelUniqueQueue) Push(data Data) error {
|
||
|
return q.PushFunc(data, nil)
|
||
|
}
|
||
|
|
||
|
// PushFunc will push data into the queue
|
||
|
func (q *ChannelUniqueQueue) PushFunc(data Data, fn func() error) error {
|
||
|
if !assignableTo(data, q.exemplar) {
|
||
|
return fmt.Errorf("Unable to assign data: %v to same type as exemplar: %v in queue: %s", data, q.exemplar, q.name)
|
||
|
}
|
||
|
q.lock.Lock()
|
||
|
locked := true
|
||
|
defer func() {
|
||
|
if locked {
|
||
|
q.lock.Unlock()
|
||
|
}
|
||
|
}()
|
||
|
if _, ok := q.table[data]; ok {
|
||
|
return ErrAlreadyInQueue
|
||
|
}
|
||
|
// FIXME: We probably need to implement some sort of limit here
|
||
|
// If the downstream queue blocks this table will grow without limit
|
||
|
q.table[data] = true
|
||
|
if fn != nil {
|
||
|
err := fn()
|
||
|
if err != nil {
|
||
|
delete(q.table, data)
|
||
|
return err
|
||
|
}
|
||
|
}
|
||
|
locked = false
|
||
|
q.lock.Unlock()
|
||
|
q.WorkerPool.Push(data)
|
||
|
return nil
|
||
|
}
|
||
|
|
||
|
// Has checks if the data is in the queue
|
||
|
func (q *ChannelUniqueQueue) Has(data Data) (bool, error) {
|
||
|
q.lock.Lock()
|
||
|
defer q.lock.Unlock()
|
||
|
_, has := q.table[data]
|
||
|
return has, nil
|
||
|
}
|
||
|
|
||
|
// Name returns the name of this queue
|
||
|
func (q *ChannelUniqueQueue) Name() string {
|
||
|
return q.name
|
||
|
}
|
||
|
|
||
|
func init() {
|
||
|
queuesMap[ChannelUniqueQueueType] = NewChannelUniqueQueue
|
||
|
}
|