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watcher.go
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watcher.go
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package scheduler
import (
"github.com/vmware/harbor/src/common/scheduler/policy"
"github.com/vmware/harbor/src/common/scheduler/task"
"github.com/vmware/harbor/src/common/utils/log"
"fmt"
"sync"
)
//Watcher is an asynchronous runner to provide an evaluation environment for the policy.
type Watcher struct {
//Locker to sync related operations.
*sync.RWMutex
//The target policy.
p policy.Policy
//The channel for receive stop signal.
cmdChan chan bool
//Indicate whether the watcher is started and running.
isRunning bool
//Report stats to scheduler.
stats chan *StatItem
//If policy is automatically completed, report the policy to scheduler.
doneChan chan *Watcher
}
//NewWatcher is used as a constructor.
func NewWatcher(p policy.Policy, st chan *StatItem, done chan *Watcher) *Watcher {
return &Watcher{
RWMutex: new(sync.RWMutex),
p: p,
cmdChan: make(chan bool),
isRunning: false,
stats: st,
doneChan: done,
}
}
//Start the running.
func (wc *Watcher) Start() {
//Lock for state changing
wc.Lock()
defer wc.Unlock()
if wc.isRunning {
return
}
if wc.p == nil {
return
}
go func(pl policy.Policy) {
defer func() {
if r := recover(); r != nil {
log.Errorf("Runtime error in watcher:%s\n", r)
}
}()
evalChan, err := pl.Evaluate()
if err != nil {
log.Errorf("Failed to evaluate ploicy %s with error: %s\n", pl.Name(), err.Error())
return
}
done := pl.Done()
for {
select {
case <-evalChan:
{
//If worker is not running, should not response any requests.
if !wc.IsRunning() {
continue
}
log.Infof("Receive evaluation signal from policy '%s'\n", pl.Name())
//Start to run the attached tasks.
for _, t := range pl.Tasks() {
go func(tk task.Task) {
defer func() {
if r := recover(); r != nil {
st := &StatItem{statTaskFail, 1, fmt.Errorf("Runtime error in task execution:%s", r)}
if wc.stats != nil {
wc.stats <- st
}
}
}()
err := tk.Run()
//Report task execution stats.
st := &StatItem{statTaskComplete, 1, err}
if err != nil {
st.Type = statTaskFail
}
if wc.stats != nil {
wc.stats <- st
}
}(t)
//Report task run stats.
st := &StatItem{statTaskRun, 1, nil}
if wc.stats != nil {
wc.stats <- st
}
}
}
case <-done:
{
//Policy is automatically completed.
//Report policy change stats.
if wc.doneChan != nil {
wc.doneChan <- wc
}
return
}
case <-wc.cmdChan:
//Exit goroutine.
return
}
}
}(wc.p)
wc.isRunning = true
}
//Stop the running.
func (wc *Watcher) Stop() {
//Lock for state changing
wc.Lock()
if !wc.isRunning {
wc.Unlock()
return
}
wc.isRunning = false
wc.Unlock()
//Disable policy.
if wc.p != nil {
wc.p.Disable()
}
//Stop watcher.
wc.cmdChan <- true
log.Infof("Worker for policy %s is stopped.\n", wc.p.Name())
}
//IsRunning to indicate if the watcher is still running.
func (wc *Watcher) IsRunning() bool {
wc.RLock()
defer wc.RUnlock()
return wc.isRunning
}