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conductor.go
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conductor.go
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// Copyright (c) 2016 Pani Networks
// All Rights Reserved.
//
// 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 kubernetes
import (
"log"
)
// manageResources manages map of termination channels and fires up new
// per-namespace gorotines when needed.
func (l *kubeListener) manageResources(ns Event, terminators map[string]chan Done, out chan Event) {
uid := ns.Object.Metadata.Uid
if ns.Type == KubeEventAdded {
if _, ok := terminators[uid]; ok {
log.Println("Received ADDED event for uid that is already known, ignoring ", uid)
return
}
done := make(chan Done)
terminators[uid] = done
ns.Object.produce(out, terminators[uid], l)
} else if ns.Type == KubeEventDeleted {
if _, ok := terminators[uid]; !ok {
log.Println("Received DELETED event for uid that is not known, ignoring ", uid)
return
}
close(terminators[uid])
delete(terminators, uid)
} else if ns.Type == InternalEventDeleteAll {
for uid, c := range terminators {
close(c)
delete(terminators, uid)
}
}
}
// conductor manages a set of goroutines one per namespace.
func (l *kubeListener) conductor(in <-chan Event, done <-chan Done) <-chan Event {
// done in arguments is a channel that can be used to stop Conductor itsefl
// while map of Done's below is for terminating managed gorotines.
// Idea of this map is to keep termination channels organized
// so when DELETED event occurs on a namespace it would be possible
// to terminater related goroutine.
terminators := map[string]chan Done{}
ns := Event{}
out := make(chan Event)
go func() {
for {
select {
case ns = <-in:
l.manageResources(ns, terminators, out)
// ADDED, DELETED events for namespace handled here
ns.handle(l)
case <-done:
return
}
}
}()
return out
}