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main.go
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/
main.go
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package main
import (
"context"
"flag"
"fmt"
"log"
"os"
"os/signal"
"syscall"
"time"
"github.com/giantswarm/k8sclient/v7/pkg/k8sclient"
"github.com/giantswarm/k8sclient/v7/pkg/k8srestconfig"
"github.com/giantswarm/microerror"
"github.com/giantswarm/micrologger"
"k8s.io/client-go/rest"
"github.com/giantswarm/azure-scheduled-events/pkg/azuremetadataclient"
"github.com/giantswarm/azure-scheduled-events/pkg/collector"
"github.com/giantswarm/azure-scheduled-events/pkg/eventhandler"
"github.com/giantswarm/azure-scheduled-events/pkg/eventhandler/drainer"
)
var (
k8sAddress string
cafile string
crtfile string
keyfile string
kubeconfigPath string
inCluster bool
mainLoopInterval int
prometheusExporterPort uint
)
const k8sNodeNameEnvVarName = "K8S_NODE_NAME"
func main() {
flag.StringVar(&k8sAddress, "k8saddress", "", "k8s address.")
flag.StringVar(&cafile, "cafile", "", "TLS ca file.")
flag.StringVar(&crtfile, "crtfile", "", "TLS crt file.")
flag.StringVar(&keyfile, "keyfile", "", "TLS key file.")
flag.StringVar(&kubeconfigPath, "kubeconfigpath", "", "kubeconfig path.")
flag.BoolVar(&inCluster, "incluster", true, "whether it runs in k8s cluster or not.")
flag.IntVar(&mainLoopInterval, "check-interval", 5, "The interval in seconds between two checks of the events")
flag.UintVar(&prometheusExporterPort, "prometheus-exporter-listen-port", 8080, "The TCP port the Prometheus exporter should listen to. Optional. Defaults to 8080.")
flag.Parse()
ctx := context.Background()
sigs := make(chan os.Signal, 1)
done := make(chan bool, 1)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
go func() {
<-sigs
done <- true
}()
logger, err := micrologger.New(micrologger.Config{})
if err != nil {
log.Fatal(err)
}
k8sclients, err := getK8sClient(logger, k8sAddress, cafile, crtfile, keyfile, kubeconfigPath, inCluster)
if err != nil {
log.Fatal(err)
}
azureMetadata, err := azuremetadataclient.New(azuremetadataclient.Config{
Logger: logger,
})
if err != nil {
log.Fatal(err)
}
localNodeName := os.Getenv(k8sNodeNameEnvVarName)
if localNodeName == "" {
log.Fatalf("Missing required environment variable %s", k8sNodeNameEnvVarName)
}
logger.LogCtx(ctx, "level", "info", "message", fmt.Sprintf("Local Kubernetes Node Name is %q", localNodeName))
eventHandlers := []eventhandler.EventHandler{
drainer.NewDrainEventHandler(logger, azureMetadata, k8sclients.K8sClient(), localNodeName),
}
interval := 5
ticker := time.NewTicker(time.Second * time.Duration(interval))
go func() {
logger.LogCtx(ctx, "level", "info", "message", fmt.Sprintf("Starting main loop with %d seconds interval", interval))
for range ticker.C {
events, err := azureMetadata.FetchEvents()
if err != nil {
logger.Errorf(ctx, err, "Error fetching events from azure metadata service")
continue
}
for _, event := range events {
for _, handler := range eventHandlers {
err = handler.HandleEvent(ctx, event)
if err != nil {
logger.Errorf(ctx, err, "Error handling event")
}
}
}
}
}()
// Start collector.
{
coll, err := collector.New(collector.Config{
Port: prometheusExporterPort,
})
if err != nil {
log.Fatalf("Error initializing metrics collector: %s", err)
}
coll.StartAsync()
}
<-done
ticker.Stop()
logger.LogCtx(ctx, "message", "Exiting")
}
func getK8sClient(logger micrologger.Logger, k8sAddress, cafile, crtfile, keyfile, kubeconfigPath string, incluster bool) (*k8sclient.Clients, error) {
var err error
var k8sClient *k8sclient.Clients
{
defined := 0
if k8sAddress != "" {
defined++
}
if incluster {
defined++
}
if kubeconfigPath != "" {
defined++
}
if defined == 0 {
return nil, microerror.Maskf(invalidConfigError, "address or inCluster or kubeConfigPath must be defined")
}
if defined > 1 {
return nil, microerror.Maskf(invalidConfigError, "address and inCluster and kubeConfigPath must not be defined at the same time")
}
var restConfig *rest.Config
if kubeconfigPath == "" {
restConfig, err = buildK8sRestConfig(logger, k8sAddress, cafile, crtfile, keyfile, kubeconfigPath, incluster)
if err != nil {
return nil, microerror.Mask(err)
}
}
c := k8sclient.ClientsConfig{
Logger: logger,
SchemeBuilder: k8sclient.SchemeBuilder{},
KubeConfigPath: kubeconfigPath,
RestConfig: restConfig,
}
k8sClient, err = k8sclient.NewClients(c)
if err != nil {
return nil, microerror.Mask(err)
}
}
return k8sClient, nil
}
func buildK8sRestConfig(logger micrologger.Logger, k8sAddress, cafile, crtfile, keyfile, kubeconfigPath string, incluster bool) (*rest.Config, error) {
c := k8srestconfig.Config{
Logger: logger,
Address: k8sAddress,
InCluster: incluster,
KubeConfig: kubeconfigPath,
TLS: k8srestconfig.ConfigTLS{
CAFile: cafile,
CrtFile: crtfile,
KeyFile: keyfile,
},
}
restConfig, err := k8srestconfig.New(c)
if err != nil {
return nil, microerror.Mask(err)
}
return restConfig, nil
}
var invalidConfigError = µerror.Error{
Kind: "invalidConfigError",
}