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// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package jobs
import (
"math/rand"
"time"
l4g "github.com/alecthomas/log4go"
"github.com/mattermost/platform/model"
)
const (
WATCHER_POLLING_INTERVAL = 15000
)
type Watcher struct {
workers *Workers
stop chan bool
stopped chan bool
}
func MakeWatcher(workers *Workers) *Watcher {
return &Watcher{
stop: make(chan bool, 1),
stopped: make(chan bool, 1),
workers: workers,
}
}
func (watcher *Watcher) Start() {
l4g.Debug("Watcher Started")
// Delay for some random number of milliseconds before starting to ensure that multiple
// instances of the jobserver don't poll at a time too close to each other.
rand.Seed(time.Now().UTC().UnixNano())
_ = <-time.After(time.Duration(rand.Intn(WATCHER_POLLING_INTERVAL)) * time.Millisecond)
defer func(){
l4g.Debug("Watcher Finished")
watcher.stopped <- true
}()
for {
select {
case <-watcher.stop:
l4g.Debug("Watcher: Received stop signal")
return
case <-time.After(WATCHER_POLLING_INTERVAL * time.Millisecond):
watcher.PollAndNotify()
}
}
}
func (watcher *Watcher) Stop() {
l4g.Debug("Watcher Stopping")
watcher.stop <- true
<-watcher.stopped
}
func (watcher *Watcher) PollAndNotify() {
if result := <-Srv.Store.Job().GetAllByStatus(model.JOB_STATUS_PENDING); result.Err != nil {
l4g.Error("Error occured getting all pending statuses: %v", result.Err.Error())
} else {
jobStatuses := result.Data.([]*model.Job)
for _, js := range jobStatuses {
j := model.Job{
Type: js.Type,
Id: js.Id,
}
if js.Type == model.JOB_TYPE_DATA_RETENTION {
if watcher.workers.DataRetention != nil {
select {
case watcher.workers.DataRetention.JobChannel() <- j:
default:
}
}
}
}
}
}
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