forked from rancher/scheduler
/
main.go
146 lines (129 loc) · 3.53 KB
/
main.go
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package main
import (
"fmt"
"net/http"
"os"
t "time"
"strconv"
"github.com/Sirupsen/logrus"
"github.com/pkg/errors"
"github.com/rancher/go-rancher-metadata/metadata"
"github.com/rancher/go-rancher/v2"
"github.com/rancher/scheduler/events"
"github.com/rancher/scheduler/resourcewatchers"
"github.com/rancher/scheduler/scheduler"
"github.com/urfave/cli"
)
var VERSION = "v0.1.0-dev"
func init() {
logrus.SetOutput(os.Stdout)
}
func main() {
app := cli.NewApp()
app.Name = "scheduler"
app.Version = VERSION
app.Usage = "An external resource based scheduler for Rancher."
app.Action = run
app.Flags = []cli.Flag{
cli.StringFlag{
Name: "metadata-address",
Usage: "The metadata service address",
Value: "rancher-metadata",
},
cli.IntFlag{
Name: "health-check-port",
Usage: "Port to listen on for healthchecks",
Value: 80,
},
}
app.Run(os.Args)
}
func run(c *cli.Context) error {
if os.Getenv("RANCHER_DEBUG") == "true" {
logrus.SetLevel(logrus.DebugLevel)
}
sleep := os.Getenv("CATTLE_SCHEDULER_SLEEPTIME")
time := 1
if sleep != "" {
if val, err := strconv.Atoi(sleep); err != nil {
time = val
}
}
scheduler := scheduler.NewScheduler(time)
mdClient := metadata.NewClient(fmt.Sprintf("http://%s/2016-07-29", c.String("metadata-address")))
scheduler.SetMetadataClient(mdClient)
url := os.Getenv("CATTLE_URL")
ak := os.Getenv("CATTLE_ACCESS_KEY")
sk := os.Getenv("CATTLE_SECRET_KEY")
if url == "" || ak == "" || sk == "" {
logrus.Fatalf("Cattle connection environment variables not available. URL: %v, access key %v, secret key redacted.", url, ak)
}
apiClient, err := client.NewRancherClient(&client.ClientOpts{
Timeout: t.Second * 30,
Url: url,
AccessKey: ak,
SecretKey: sk,
})
if err != nil {
return err
}
exit := make(chan error)
go func(exit chan<- error) {
err := events.ConnectToEventStream(url, ak, sk, scheduler)
exit <- errors.Wrapf(err, "Cattle event subscriber exited.")
}(exit)
go func(exit chan<- error) {
err := resourcewatchers.WatchMetadata(mdClient, scheduler, apiClient)
exit <- errors.Wrap(err, "Metadata watcher exited")
}(exit)
go func(exit chan<- error) {
err := startHealthCheck(c.Int("health-check-port"), mdClient)
exit <- errors.Wrapf(err, "Healthcheck provider died.")
}(exit)
go func() {
for {
t.Sleep(t.Minute * 3)
logrus.Info("Syncing scheduler information with rancher metadata")
for {
ok, err := scheduler.UpdateWithMetadata(true)
if err != nil {
logrus.Warnf("Error syncing with metadata: %v", err)
break
}
if !ok {
logrus.Infof("Delaying metadata sync by 5 seconds since scheduler is actively handling events.")
t.Sleep(t.Second * 5)
continue
}
// Sync was completed successfully. Break out of inner loop
break
}
}
}()
err = <-exit
logrus.Errorf("Exiting scheduler with error: %v", err)
return err
}
func startHealthCheck(listen int, md metadata.Client) error {
http.HandleFunc("/healthcheck", func(w http.ResponseWriter, r *http.Request) {
healthy := true
_, err := md.GetVersion()
if err != nil {
healthy = false
}
cattleURL := os.Getenv("CATTLE_URL")
resp, err := http.Get(cattleURL[:len(cattleURL)-2] + "ping")
if err != nil {
healthy = false
}
defer resp.Body.Close()
if healthy {
fmt.Fprint(w, "ok")
} else {
http.Error(w, "Metadata and dns is unreachable", http.StatusNotFound)
}
})
logrus.Infof("Listening for health checks on 0.0.0.0:%d/healthcheck", listen)
err := http.ListenAndServe(fmt.Sprintf(":%d", listen), nil)
return err
}