func isLeader(l registry.Lease, machID string) bool { if l == nil { return false } if l.MachineID() != machID { return false } return true }
func (e *Engine) Run(ival time.Duration, stop chan bool) { leaseTTL := ival * 5 machID := e.machine.State().ID reconcile := func() { if !ensureEngineVersionMatch(e.cRegistry, engineVersion) { return } var l registry.Lease if isLeader(e.lease, machID) { l = renewLeadership(e.lease, leaseTTL) } else { l = acquireLeadership(e.lRegistry, machID, engineVersion, leaseTTL) } // log all leadership changes if l != nil && e.lease == nil && l.MachineID() != machID { log.Infof("Engine leader is %s", l.MachineID()) } else if l != nil && e.lease != nil && l.MachineID() != e.lease.MachineID() { log.Infof("Engine leadership changed from %s to %s", e.lease.MachineID(), l.MachineID()) } e.lease = l if !isLeader(e.lease, machID) { return } // abort is closed when reconciliation must stop prematurely, either // by a local timeout or the fleet server shutting down abort := make(chan struct{}) // monitor is used to shut down the following goroutine monitor := make(chan struct{}) go func() { select { case <-monitor: return case <-time.After(leaseTTL): close(abort) case <-stop: close(abort) } }() start := time.Now() e.rec.Reconcile(e, abort) close(monitor) elapsed := time.Now().Sub(start) msg := fmt.Sprintf("Engine completed reconciliation in %s", elapsed) if elapsed > ival { log.Warning(msg) } else { log.Debug(msg) } } rec := pkg.NewPeriodicReconciler(ival, reconcile, e.rStream) rec.Run(stop) }