84 lines
2.4 KiB
Go
84 lines
2.4 KiB
Go
package main
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import (
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"context"
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"fmt"
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"github.com/multiplay/go-slack/chat"
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"github.com/multiplay/go-slack/webhook"
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"github.com/robfig/cron"
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"gopkg.in/alecthomas/kingpin.v2"
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v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/client-go/kubernetes"
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"k8s.io/client-go/rest"
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"os"
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"os/signal"
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"syscall"
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"time"
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)
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func main() {
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slackUrl := kingpin.Flag("slack-url", "The Slack Webhook URL").Envar("SLACK_URL").Required().String()
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kingpin.Parse()
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config, err := rest.InClusterConfig()
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if err != nil {
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panic(err.Error())
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}
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clientset, err := kubernetes.NewForConfig(config)
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if err != nil {
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panic(err.Error())
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}
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slack := webhook.New(*slackUrl)
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parser := cron.NewParser(cron.Minute | cron.Hour | cron.Dom | cron.Month | cron.Dow)
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ic := make(chan os.Signal, 1)
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signal.Notify(ic, os.Interrupt, syscall.SIGTERM)
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for {
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select {
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case <-ic:
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fmt.Printf("Got SIGTERM signal, exiting\n")
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break
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default:
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cronjobs, err := clientset.BatchV1beta1().CronJobs("").List(context.Background(), v1.ListOptions{})
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if err != nil {
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fmt.Printf("Error getting cronjobs: %s", err)
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os.Exit(1)
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}
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limit := time.Now().Add(-120 * time.Second)
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for _, c := range cronjobs.Items {
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if c.Spec.Suspend == nil || !*c.Spec.Suspend {
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since := c.CreationTimestamp
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if c.Status.LastScheduleTime != nil {
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since = *c.Status.LastScheduleTime
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}
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schedule, err := parser.Parse(c.Spec.Schedule)
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if err != nil {
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fmt.Printf("Error parsing schedule of %s/%s (%s): %s", c.Namespace, c.Name, c.Spec.Schedule, err)
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os.Exit(1)
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}
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next := schedule.Next(since.Time)
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fmt.Printf("Checking %s/%s since %s, next schedule %s, limit %s.\n", c.Namespace, c.Name, since.Format(time.RFC3339), next.Format(time.RFC3339), limit.Format(time.RFC3339))
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if next.Before(limit) {
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fmt.Printf("%s was not scheduled. Sending Slack notification.\n", c.Name)
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m := &chat.Message{
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Text: fmt.Sprintf("Cronjob %s/%s is not running according to schedule (%s). Last scheduled: %s", c.Namespace, c.Name, c.Spec.Schedule, since.Format(time.RFC3339)),
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Username: "cron-checker",
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}
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resp, err := m.Send(slack)
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if err != nil {
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fmt.Printf("Unable to send Slack notification: %s", err)
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}
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if !resp.OK {
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fmt.Printf("Unable to send Slack notification: %s", resp.Error)
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}
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}
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}
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}
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time.Sleep(60 * time.Second)
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}
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}
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}
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