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cloudreve/pkg/task/job.go

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package task
import (
model "github.com/HFO4/cloudreve/models"
"github.com/HFO4/cloudreve/pkg/util"
)
// 任务类型
const (
// CompressTaskType 压缩任务
CompressTaskType = iota
// DecompressTaskType 解压缩任务
DecompressTaskType
// TransferTaskType 中转任务
TransferTaskType
)
// 任务状态
const (
// Queued 排队中
Queued = iota
// Processing 处理中
Processing
// Error 失败
Error
// Canceled 取消
Canceled
// Complete 完成
Complete
)
// 任务进度
const (
// PendingProgress 等待中
PendingProgress = iota
// Compressing 压缩中
CompressingProgress
// Decompressing 解压缩中
DecompressingProgress
// Downloading 下载中
DownloadingProgress
// Transferring 转存中
TransferringProgress
)
// Job 任务接口
type Job interface {
Type() int // 返回任务类型
Creator() uint // 返回创建者ID
Props() string // 返回序列化后的任务属性
Model() *model.Task // 返回对应的数据库模型
SetStatus(int) // 设定任务状态
Do() // 开始执行任务
SetError(*JobError) // 设定任务失败信息
GetError() *JobError // 获取任务执行结果返回nil表示成功完成执行
}
// JobError 任务失败信息
type JobError struct {
Msg string `json:"msg,omitempty"`
Error string `json:"error,omitempty"`
}
// Record 将任务记录到数据库中
func Record(job Job) (*model.Task, error) {
record := model.Task{
Status: Queued,
Type: job.Type(),
UserID: job.Creator(),
Progress: 0,
Error: "",
Props: job.Props(),
}
_, err := record.Create()
return &record, err
}
// Resume 从数据库中恢复未完成任务
func Resume() {
tasks := model.GetTasksByStatus(Queued, Processing)
if len(tasks) == 0 {
return
}
util.Log().Info("从数据库中恢复 %d 个未完成任务", len(tasks))
for i := 0; i < len(tasks); i++ {
job, err := GetJobFromModel(&tasks[i])
if err != nil {
util.Log().Warning("无法恢复任务,%s", err)
continue
}
TaskPoll.Submit(job)
}
}
// GetJobFromModel 从数据库给定模型获取任务
func GetJobFromModel(task *model.Task) (Job, error) {
switch task.Type {
case CompressTaskType:
return NewCompressTaskFromModel(task)
case DecompressTaskType:
return NewDecompressTaskFromModel(task)
case TransferTaskType:
return NewTransferTaskFromModel(task)
default:
return nil, ErrUnknownTaskType
}
}