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kube-scheduler.go
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kube-scheduler.go
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package main
import (
"flag"
"fmt"
"log"
"os"
"os/signal"
"github.com/golang/glog"
"github.com/pkg/errors"
"github.com/wearemolecule/kube-scheduler/kubernetes"
"github.com/wearemolecule/kube-scheduler/notifier"
"github.com/wearemolecule/kube-scheduler/scheduler"
)
var (
kubernetesConfigPath string
scheduleConfigPath string
scheduleConfigName string
)
func init() {
flag.StringVar(&scheduleConfigName, "schedule-name", "schedule.yml", "name of schedule config file (defaults to schedule.yml)")
flag.StringVar(&scheduleConfigPath, "schedule-path", ".", "absolute path to schedule yaml (defaults to current dir)")
flag.StringVar(&kubernetesConfigPath, "kube-config-path", "", "absolute path to kubernetes credentials dir")
}
func main() {
flag.Parse()
birthCry()
namespace := os.Getenv("SCHEDULER_NAMESPACE")
notifier := notifier.NewClient(namespace, githash)
kubernetesClient, err := kubernetes.NewClient(kubernetesConfigPath, scheduleConfigPath)
if err != nil {
notifier.Notify("Failed to create kubernetes client", err)
return
}
scheduler, err := scheduler.NewClient(scheduleConfigPath, scheduleConfigName)
if err != nil {
notifier.Notify("Failed to create scheduler", err)
return
}
done := make(chan int)
go schedule(scheduler, kubernetesClient, notifier, done)
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, os.Interrupt, os.Kill)
s := <-sigs
done <- 1
glog.Infof("Got signal: %s", s)
}
func schedule(
scheduler scheduler.ClientInterface,
kubeClient kubernetes.ClientInterface,
notifier notifier.ClientInterface,
done chan int,
) {
for name, job := range scheduler.JobList() {
if job.Cron == "" {
continue
}
// Must copy the variables to retain scope inside the AsyncAddScheduledJob func
nameCopy := name
jobCopy := job
glog.Infof("Found job %s with schedule %s", nameCopy, jobCopy.Cron)
scheduler.AsyncAddScheduledJob(job, func() {
glog.Info("Running job ", nameCopy)
defer glog.Info("Finished job ", nameCopy)
if err := run(nameCopy, jobCopy, kubeClient, scheduler); err != nil {
notifier.Notify("Run job failed", err)
}
})
}
scheduler.Start()
defer scheduler.Stop()
for {
select {
case <-done:
return
}
}
}
func run(name string, job scheduler.Job, kubeClient kubernetes.ClientInterface, scheduler scheduler.ClientInterface) error {
if scheduler.Running(name, job) {
glog.Warningf("Unable to start %s because it is already running", name)
return nil
}
scheduler.StartJob(name, job)
defer scheduler.FinishJob(name, job)
if err := kubeClient.RunJob(name, job); err != nil {
return errors.Wrap(err, fmt.Sprintf("Job %s failed", name))
}
return nil
}
var (
buildstamp = "none provided"
githash = "none provided"
)
func birthCry() {
log.Println("Git Commit Hash:", githash)
log.Println("Build Time:", buildstamp)
}