// deriveJob instantiates a new job based on the passed periodic job and the
// launch time.
func (p *PeriodicDispatch) deriveJob(periodicJob *structs.Job, time time.Time) (
derived *structs.Job, err error) {
// Have to recover in case the job copy panics.
defer func() {
if r := recover(); r != nil {
p.logger.Printf("[ERR] nomad.periodic: deriving job from"+
" periodic job %v failed; deregistering from periodic runner: %v",
periodicJob.ID, r)
p.Remove(periodicJob.ID)
derived = nil
err = fmt.Errorf("Failed to create a copy of the periodic job %v: %v", periodicJob.ID, r)
}
}()
// Create a copy of the periodic job, give it a derived ID/Name and make it
// non-periodic.
derived = periodicJob.Copy()
derived.ParentID = periodicJob.ID
derived.ID = p.derivedJobID(periodicJob, time)
derived.Name = derived.ID
derived.Periodic = nil
derived.GC = true
return
}
// setJobStatus sets the status of the job by looking up associated evaluations
// and allocations. evalDelete should be set to true if setJobStatus is being
// called because an evaluation is being deleted (potentially because of garbage
// collection). If forceStatus is non-empty, the job's status will be set to the
// passed status.
func (s *StateStore) setJobStatus(index uint64, watcher watch.Items, txn *memdb.Txn,
job *structs.Job, evalDelete bool, forceStatus string) error {
// Capture the current status so we can check if there is a change
oldStatus := job.Status
newStatus := forceStatus
// If forceStatus is not set, compute the jobs status.
if forceStatus == "" {
var err error
newStatus, err = s.getJobStatus(txn, job, evalDelete)
if err != nil {
return err
}
}
// Fast-path if nothing has changed.
if oldStatus == newStatus {
return nil
}
// The job has changed, so add to watcher.
watcher.Add(watch.Item{Table: "jobs"})
watcher.Add(watch.Item{Job: job.ID})
// Copy and update the existing job
updated := job.Copy()
updated.Status = newStatus
updated.ModifyIndex = index
// Insert the job
if err := txn.Insert("jobs", updated); err != nil {
return fmt.Errorf("job insert failed: %v", err)
}
if err := txn.Insert("index", &IndexEntry{"jobs", index}); err != nil {
return fmt.Errorf("index update failed: %v", err)
}
return nil
}