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scheduler.go
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scheduler.go
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package pki
import (
"log"
"sync"
"sync/atomic"
"time"
)
type backgroundTask struct {
name string
f func()
workers int64
currentWorkers int64
interval time.Duration
lastRun time.Time
}
type taskStorageStruct struct {
inited bool
tasks []*backgroundTask
sync.RWMutex
}
func (task *backgroundTask) cancel() {
}
func (s *taskStorageStruct) getTasksNames() []string {
s.RLock()
defer s.RUnlock()
l := make([]string, len(s.tasks))
for i := range s.tasks {
l[i] = s.tasks[i].name
}
return l
}
func (s *taskStorageStruct) register(name string, f func(), count int, interval time.Duration) {
s.Lock()
defer s.Unlock()
task := backgroundTask{name: name, f: f, workers: int64(count), interval: interval}
for i := range s.tasks {
if s.tasks[i].name == task.name {
log.Printf("%s duplicated task %v", logPrefixVenafiScheduler, name)
return
}
}
s.tasks = append(s.tasks, &task)
}
func (s *taskStorageStruct) del(taskName string) {
s.Lock()
defer s.Unlock()
for i := range s.tasks {
if s.tasks[i].name == taskName {
s.tasks[i].cancel()
s.tasks = append(s.tasks[:i], s.tasks[i+1:]...)
return
}
}
}
func (s *taskStorageStruct) init() {
if s.inited {
panic(logPrefixVenafiScheduler + " twice inited loop")
}
s.inited = true
go s.loop()
}
func (s *taskStorageStruct) loop() {
for {
s.RLock()
for i := range s.tasks {
currentTask := s.tasks[i]
if currentTask.currentWorkers >= currentTask.workers {
continue
}
if time.Since(currentTask.lastRun) < currentTask.interval {
continue
}
atomic.AddInt64(¤tTask.currentWorkers, 1)
go func(counter *int64) {
defer func(counter *int64) {
r := recover()
if r != nil {
log.Printf("%s job %s failed. recover: %v\n", logPrefixVenafiScheduler, currentTask.name, r)
//todo: better log
}
atomic.AddInt64(counter, -1)
}(counter)
currentTask.f()
}(¤tTask.currentWorkers)
currentTask.lastRun = time.Now()
}
s.RUnlock()
time.Sleep(time.Second)
}
}