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scheduler.go
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/
scheduler.go
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package scheduler
import (
"log"
"runtime/debug"
"github.com/robfig/cron/v3"
)
// Task defines a particular job needs to be done by the scheduler
type Task struct {
CronTab string
Func func() error
}
// Scheduler is a cron wrapper that manages tasks
type Scheduler struct {
cron *cron.Cron
}
// New returns new *Scheduler
func New(tasks []*Task) (*Scheduler, error) {
c := cron.New()
for _, t := range tasks {
_, err := c.AddFunc(t.CronTab, handler(t.Func))
if err != nil {
return nil, err
}
}
return &Scheduler{c}, nil
}
// Run starts scheduler to do the tasks
func (s *Scheduler) Run() {
s.cron.Start()
}
func handler(fn func() error) func() {
return func() {
defer func() {
if err := recover(); err != nil {
log.Printf("scheduled job error: %v\n%v", err, string(debug.Stack()))
}
}()
if err := fn(); err != nil {
log.Printf("scheduled job error: %v", err)
}
}
}