func main() {
if len(os.Args) == 2 && os.Args[1] == "--version" {
fmt.Println(Version)
os.Exit(0)
}
readConfig()
setupLogging()
setupMetrics()
defer database.Close()
bind := fmt.Sprintf("%s:%d", viper.GetString("address"), viper.GetInt("port"))
// Catch interrupt
go func() {
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt, os.Kill)
s := <-c
if s != os.Interrupt && s != os.Kill {
return
}
log.Info("Eremetic is shutting down")
os.Exit(0)
}()
sched := scheduler.Create()
router := routes.Create(sched)
log.Infof("listening to %s", bind)
go scheduler.Run(sched)
err := http.ListenAndServe(bind, router)
if err != nil {
log.Error(err.Error())
os.Exit(1)
}
}
// StatusUpdate takes care of updating the status
func (s *eremeticScheduler) StatusUpdate(driver sched.SchedulerDriver, status *mesos.TaskStatus) {
id := status.TaskId.GetValue()
log.Debugf("Received task status [%s] for task [%s]", status.State.String(), id)
task, err := database.ReadTask(id)
if err != nil {
log.Debugf("Error reading task from database: %s", err)
}
if task.ID == "" {
task = types.EremeticTask{
ID: id,
SlaveId: status.SlaveId.GetValue(),
}
}
if !task.IsRunning() && *status.State == mesos.TaskState_TASK_RUNNING {
TasksRunning.Inc()
}
if types.IsTerminal(status.State) {
TasksTerminated.With(prometheus.Labels{"status": status.State.String()}).Inc()
if task.WasRunning() {
TasksRunning.Dec()
}
}
task.UpdateStatus(types.Status{
Status: status.State.String(),
Time: time.Now().Unix(),
})
if *status.State == mesos.TaskState_TASK_FAILED && !task.WasRunning() {
if task.Retry >= maxRetries {
log.Warnf("giving up on %s after %d retry attempts", id, task.Retry)
} else {
log.Infof("task %s was never running. re-scheduling", id)
task.UpdateStatus(types.Status{
Status: mesos.TaskState_TASK_STAGING.String(),
Time: time.Now().Unix(),
})
task.Retry++
go func() {
QueueSize.Inc()
s.tasks <- id
}()
}
}
if types.IsTerminal(status.State) {
handler.NotifyCallback(&task)
}
database.PutTask(&task)
}
// ResourceOffers handles the Resource Offers
func (s *eremeticScheduler) ResourceOffers(driver sched.SchedulerDriver, offers []*mesos.Offer) {
log.Tracef("Received %d resource offers", len(offers))
for _, offer := range offers {
select {
case <-s.shutdown:
log.Infof("Shutting down: declining offer on [%s]", offer.Hostname)
driver.DeclineOffer(offer.Id, defaultFilter)
continue
case tid := <-s.tasks:
log.Debugf("Preparing to launch task %s with offer %s", tid, offer.Id.GetValue())
t, _ := database.ReadTask(tid)
task := s.newTask(offer, &t)
database.PutTask(&t)
driver.LaunchTasks([]*mesos.OfferID{offer.Id}, []*mesos.TaskInfo{task}, defaultFilter)
continue
default:
}
log.Trace("No tasks to launch. Declining offer.")
driver.DeclineOffer(offer.Id, defaultFilter)
}
}
func ReconcileTasks(driver sched.SchedulerDriver) *Reconcile {
cancel := make(chan struct{})
done := make(chan struct{})
go func() {
var (
c uint
delay int
)
tasks, err := database.ListNonTerminalTasks()
if err != nil {
log.Errorf("Failed to list non-terminal tasks: %s", err)
close(done)
return
}
log.Infof("Trying to reconcile with %d task(s)", len(tasks))
start := time.Now()
for len(tasks) > 0 {
select {
case <-cancel:
log.Info("Cancelling reconciliation job")
close(done)
return
case <-time.After(time.Duration(delay) * time.Second):
// Filter tasks that has received a status update
ntasks := []*types.EremeticTask{}
for _, t := range tasks {
nt, err := database.ReadTask(t.ID)
if err != nil {
log.Warnf("Task %s not found in database", t.ID)
continue
}
if nt.LastUpdated().Before(start) {
ntasks = append(ntasks, &nt)
}
}
tasks = ntasks
// Send reconciliation request
if len(tasks) > 0 {
var statuses []*mesos.TaskStatus
for _, t := range tasks {
statuses = append(statuses, &mesos.TaskStatus{
State: mesos.TaskState_TASK_STAGING.Enum(),
TaskId: &mesos.TaskID{Value: proto.String(t.ID)},
SlaveId: &mesos.SlaveID{Value: proto.String(t.SlaveId)},
})
}
log.Debugf("Sending reconciliation request #%d", c)
driver.ReconcileTasks(statuses)
}
if delay < maxReconciliationDelay {
delay = 10 << c
if delay >= maxReconciliationDelay {
delay = maxReconciliationDelay
}
}
c += 1
}
}
log.Info("Reconciliation done")
close(done)
}()
return &Reconcile{
cancel: cancel,
done: done,
}
}