gocron/service/task.go

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package service
import (
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"github.com/ouqiang/gocron/models"
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"io/ioutil"
"net/http"
"strconv"
"time"
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"github.com/ouqiang/gocron/modules/logger"
"github.com/ouqiang/gocron/modules/ssh"
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"github.com/jakecoffman/cron"
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)
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var Cron *cron.Cron
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type Task struct{}
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// 初始化任务, 从数据库取出所有任务, 添加到定时任务并运行
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func (task *Task) Initialize() {
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Cron = cron.New()
Cron.Start()
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taskModel := new(models.Task)
taskList, err := taskModel.ActiveList()
if err != nil {
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logger.Error("获取任务列表错误-", err.Error())
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return
}
if len(taskList) == 0 {
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logger.Debug("任务列表为空")
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return
}
for _, item := range taskList {
task.Add(item)
}
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}
// 添加任务
func (task *Task) Add(taskModel models.TaskHost) {
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taskFunc := createHandlerJob(taskModel)
if taskFunc == nil {
logger.Error("创建任务处理Job失败,不支持的任务协议#", taskModel.Protocol)
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return
}
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cronName := strconv.Itoa(taskModel.Id)
Cron.RemoveJob(cronName)
err := Cron.AddFunc(taskModel.Spec, taskFunc, cronName)
logger.Error("添加任务到调度器失败#", err)
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}
type Handler interface {
Run(taskModel models.TaskHost) (string, error)
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}
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// HTTP任务
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type HTTPHandler struct{}
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func (h *HTTPHandler) Run(taskModel models.TaskHost) (result string, err error) {
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client := &http.Client{}
if taskModel.Timeout > 0 {
client.Timeout = time.Duration(taskModel.Timeout) * time.Second
}
req, err := http.NewRequest("POST", taskModel.Command, nil)
if err != nil {
logger.Error("任务处理#创建HTTP请求错误-", err.Error())
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return
}
req.Header.Set("Content-type", "application/x-www-form-urlencoded")
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req.Header.Set("User-Agent", "golang/gocron")
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resp, err := client.Do(req)
defer func() {
if resp != nil {
resp.Body.Close()
}
}()
if err != nil {
logger.Error("任务处理HTTP请求错误-", err.Error())
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return
}
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
logger.Error("任务处理#读取HTTP请求返回值失败-", err.Error())
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}
return string(body), err
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}
// SSH-command任务
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type SSHCommandHandler struct{}
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func (h *SSHCommandHandler) Run(taskModel models.TaskHost) (string, error) {
sshConfig := ssh.SSHConfig{
User: taskModel.Username,
Password: taskModel.Password,
Host: taskModel.Name,
Port: taskModel.Port,
ExecTimeout: taskModel.Timeout,
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}
return ssh.Exec(sshConfig, taskModel.Command)
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}
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func createTaskLog(taskModel models.TaskHost) (int64, error) {
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taskLogModel := new(models.TaskLog)
taskLogModel.Name = taskModel.Task.Name
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taskLogModel.Spec = taskModel.Spec
taskLogModel.Protocol = taskModel.Protocol
taskLogModel.Command = taskModel.Command
taskLogModel.Timeout = taskModel.Timeout
taskLogModel.Hostname = taskModel.Name
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taskLogModel.StartTime = time.Now()
taskLogModel.Status = models.Running
insertId, err := taskLogModel.Create()
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return insertId, err
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}
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func updateTaskLog(taskLogId int64, result string, err error) (int64, error) {
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taskLogModel := new(models.TaskLog)
var status models.Status
if err != nil {
result = err.Error() + " " + result
status = models.Failure
} else {
status = models.Finish
}
return taskLogModel.Update(taskLogId, models.CommonMap{
"status": status,
"result": result,
})
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}
func createHandlerJob(taskModel models.TaskHost) cron.FuncJob {
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var handler Handler = nil
switch taskModel.Protocol {
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case models.TaskHTTP:
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handler = new(HTTPHandler)
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case models.TaskSSH:
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handler = new(SSHCommandHandler)
}
if handler == nil {
return nil
}
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taskFunc := func() {
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taskLogId, err := createTaskLog(taskModel)
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if err != nil {
logger.Error("任务开始执行#写入任务日志失败-", err)
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return
}
// err != nil 执行失败, 失败重试3次
retryTime := 4
var result string = ""
for i := 0; i < retryTime; i++ {
result, err = handler.Run(taskModel)
if err == nil {
break
} else {
logger.Error("任务执行失败#tasklog.id-" + strconv.FormatInt(taskLogId, 10) + "#尝试次数-" + strconv.Itoa(i + 1) + "#" + err.Error() + " " + result)
}
}
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_, err = updateTaskLog(taskLogId, result, err)
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if err != nil {
logger.Error("任务结束#更新任务日志失败-", err)
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}
}
return taskFunc
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}