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/*
Copyright 2015 The Kubernetes Authors 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 executor
import (
"sync"
"time"
log "github.com/golang/glog"
)
type (
// filter registration events, return false to abort further processing of the event
watchFilter func(pod *PodEvent) (accept bool)
watchExpiration struct {
// timeout closes when the handler has expired; it delivers at most one Time.
timeout <-chan time.Time
// onEvent is an optional callback that is invoked if/when the expired chan
// closes
onEvent func(taskID string)
}
watchHandler struct {
// prevent callbacks from being invoked simultaneously
sync.Mutex
// handle registration events, return true to indicate the handler should be
// de-registered upon completion. If pod is nil then the associated handler
// has expired.
onEvent func(pod *PodEvent) (done bool, err error)
// expiration is an optional configuration that indicates when a handler should
// be considered to have expired, and what action to take upon such
expiration watchExpiration
}
// watcher observes PodEvent events and conditionally executes handlers that
// have been associated with the taskID of the PodEvent.
watcher struct {
updates <-chan *PodEvent
rw sync.RWMutex
handlers map[string]*watchHandler
filters []watchFilter
runOnce chan struct{}
}
)
func newWatcher(updates <-chan *PodEvent) *watcher {
return &watcher{
updates: updates,
handlers: make(map[string]*watchHandler),
runOnce: make(chan struct{}),
}
}
func (pw *watcher) run() {
select {
case <-pw.runOnce:
log.Error("run() has already been invoked for this pod-watcher")
return
default:
close(pw.runOnce)
}
updateLoop:
for u := range pw.updates {
log.V(2).Info("filtering " + u.FormatShort())
for _, f := range pw.filters {
if !f(u) {
continue updateLoop
}
}
log.V(1).Info("handling " + u.FormatShort())
h, ok := func() (h *watchHandler, ok bool) {
pw.rw.RLock()
defer pw.rw.RUnlock()
h, ok = pw.handlers[u.taskID]
return
}()
if ok {
log.V(1).Info("executing action for " + u.FormatShort())
done, err := func() (bool, error) {
h.Lock()
defer h.Unlock()
return h.onEvent(u)
}()
if err != nil {
log.Error(err)
}
if done {
// de-register handler upon successful completion of action
log.V(1).Info("de-registering handler for " + u.FormatShort())
func() {
pw.rw.Lock()
delete(pw.handlers, u.taskID)
pw.rw.Unlock()
}()
}
}
}
}
func (pw *watcher) addFilter(f watchFilter) {
select {
case <-pw.runOnce:
log.Errorf("failed to add filter because pod-watcher is already running")
default:
pw.filters = append(pw.filters, f)
}
}
// forTask associates a handler `h` with the given taskID.
func (pw *watcher) forTask(taskID string, h *watchHandler) {
pw.rw.Lock()
pw.handlers[taskID] = h
pw.rw.Unlock()
if exp := h.expiration; exp.timeout != nil {
go func() {
<-exp.timeout
log.V(1).Infof("expiring handler for task %v", taskID)
// de-register handler upon expiration
pw.rw.Lock()
delete(pw.handlers, taskID)
pw.rw.Unlock()
if exp.onEvent != nil {
h.Lock()
defer h.Unlock()
exp.onEvent(taskID)
}
}()
}
}
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