func (a *aggregator) loop() error {
var (
next time.Time
reqs []instanceInfoReq
)
for {
var ready <-chan time.Time
if !next.IsZero() {
when := next.Add(a.config.Delay)
ready = clock.Alarm(a.config.Clock, when)
}
select {
case <-a.catacomb.Dying():
return a.catacomb.ErrDying()
case req := <-a.reqc:
reqs = append(reqs, req)
if next.IsZero() {
next = a.config.Clock.Now()
}
case <-ready:
if err := a.doRequests(reqs); err != nil {
return errors.Trace(err)
}
next = time.Time{}
reqs = nil
}
}
}
func (u *Undertaker) processDeadModel(deadSince time.Time) error {
removeTime := deadSince.Add(u.config.RemoveDelay)
select {
case <-u.catacomb.Dying():
return u.catacomb.ErrDying()
case <-clock.Alarm(u.config.Clock, removeTime):
err := u.config.Facade.RemoveModel()
return errors.Annotate(err, "cannot remove model")
}
}
// nextTick returns a channel that will send a value at some point when
// we expect to have to do some work; either because at least one lease
// may be ready to expire, or because enough enough time has passed that
// it's worth checking for stalled collaborators.
func (manager *Manager) nextTick() <-chan time.Time {
now := manager.config.Clock.Now()
nextTick := now.Add(manager.config.MaxSleep)
for _, info := range manager.config.Client.Leases() {
if info.Expiry.After(nextTick) {
continue
}
nextTick = info.Expiry
}
logger.Debugf("waking to check leases at %s", nextTick)
return clock.Alarm(manager.config.Clock, nextTick)
}
// nextExpiry returns a channel that will send a value at some point when we
// expect at least one lease to be ready to expire. If no leases are known,
// it will return nil.
func (manager *manager) nextExpiry() <-chan time.Time {
var nextExpiry *time.Time
for _, info := range manager.config.Client.Leases() {
if nextExpiry != nil {
if info.Expiry.After(*nextExpiry) {
continue
}
}
nextExpiry = &info.Expiry
}
if nextExpiry == nil {
logger.Tracef("no leases recorded; never waking for expiry")
return nil
}
logger.Tracef("waking to expire leases at %s", *nextExpiry)
return clock.Alarm(manager.config.Clock, *nextExpiry)
}