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reconcile.go
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reconcile.go
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/*
Copyright 2014 CoreOS, Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package pkg
import (
"time"
"github.com/jonboulle/clockwork"
"github.com/coreos/fleet/log"
)
type Event string
// EventStream generates a channel which will emit an event as soon as one of
// interest occurs. Any background operation associated with the channel
// should be terminated when stop is closed.
type EventStream interface {
Next(stop chan struct{}) chan Event
}
type PeriodicReconciler interface {
Run(stop chan bool)
}
// NewPeriodicReconciler creates a PeriodicReconciler that will run recFunc at least every
// ival, or in response to anything emitted from EventStream.Next()
func NewPeriodicReconciler(interval time.Duration, recFunc func(), eStream EventStream) PeriodicReconciler {
return &reconciler{
ival: interval,
rFunc: recFunc,
eStream: eStream,
clock: clockwork.NewRealClock(),
}
}
type reconciler struct {
ival time.Duration
rFunc func()
eStream EventStream
clock clockwork.Clock
}
func (r *reconciler) Run(stop chan bool) {
trigger := make(chan struct{})
go func() {
abort := make(chan struct{})
for {
select {
case <-stop:
close(abort)
return
case <-r.eStream.Next(abort):
trigger <- struct{}{}
}
}
}()
ticker := r.clock.After(r.ival)
// When starting up, reconcile once immediately
log.V(1).Info("Initial reconcilation commencing")
r.rFunc()
for {
select {
case <-stop:
log.V(1).Info("Reconciler exiting due to stop signal")
return
case <-ticker:
ticker = r.clock.After(r.ival)
log.V(1).Info("Reconciler tick")
r.rFunc()
case <-trigger:
ticker = r.clock.After(r.ival)
log.V(1).Info("Reconciler triggered")
r.rFunc()
}
}
}