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// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package app
import (
"fmt"
"time"
l4g "github.com/alecthomas/log4go"
"github.com/mattermost/mattermost-server/model"
"github.com/mattermost/mattermost-server/utils"
)
const (
DISCOVERY_SERVICE_WRITE_PING = 60 * time.Second
)
type ClusterDiscoveryService struct {
model.ClusterDiscovery
app *App
stop chan bool
}
func (a *App) NewClusterDiscoveryService() *ClusterDiscoveryService {
ds := &ClusterDiscoveryService{
ClusterDiscovery: model.ClusterDiscovery{},
app: a,
stop: make(chan bool),
}
return ds
}
func (me *ClusterDiscoveryService) Start() {
<-me.app.Srv.Store.ClusterDiscovery().Cleanup()
if cresult := <-me.app.Srv.Store.ClusterDiscovery().Exists(&me.ClusterDiscovery); cresult.Err != nil {
l4g.Error(fmt.Sprintf("ClusterDiscoveryService failed to check if row exists for %v with err=%v", me.ClusterDiscovery.ToJson(), cresult.Err))
} else {
if cresult.Data.(bool) {
if u := <-me.app.Srv.Store.ClusterDiscovery().Delete(&me.ClusterDiscovery); u.Err != nil {
l4g.Error(fmt.Sprintf("ClusterDiscoveryService failed to start clean for %v with err=%v", me.ClusterDiscovery.ToJson(), u.Err))
}
}
}
if result := <-me.app.Srv.Store.ClusterDiscovery().Save(&me.ClusterDiscovery); result.Err != nil {
l4g.Error(fmt.Sprintf("ClusterDiscoveryService failed to save for %v with err=%v", me.ClusterDiscovery.ToJson(), result.Err))
return
}
go func() {
l4g.Debug(fmt.Sprintf("ClusterDiscoveryService ping writer started for %v", me.ClusterDiscovery.ToJson()))
ticker := time.NewTicker(DISCOVERY_SERVICE_WRITE_PING)
defer func() {
ticker.Stop()
if u := <-me.app.Srv.Store.ClusterDiscovery().Delete(&me.ClusterDiscovery); u.Err != nil {
l4g.Error(fmt.Sprintf("ClusterDiscoveryService failed to cleanup for %v with err=%v", me.ClusterDiscovery.ToJson(), u.Err))
}
l4g.Debug(fmt.Sprintf("ClusterDiscoveryService ping writer stopped for %v", me.ClusterDiscovery.ToJson()))
}()
for {
select {
case <-ticker.C:
if u := <-me.app.Srv.Store.ClusterDiscovery().SetLastPingAt(&me.ClusterDiscovery); u.Err != nil {
l4g.Error(fmt.Sprintf("ClusterDiscoveryService failed to write ping for %v with err=%v", me.ClusterDiscovery.ToJson(), u.Err))
}
case <-me.stop:
return
}
}
}()
}
func (me *ClusterDiscoveryService) Stop() {
me.stop <- true
}
func (a *App) IsLeader() bool {
if utils.IsLicensed() && *utils.Cfg.ClusterSettings.Enable && a.Cluster != nil {
return a.Cluster.IsLeader()
} else {
return true
}
}
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