forked from kyma-project/kyma
/
main.go
163 lines (135 loc) · 6.21 KB
/
main.go
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package main
import (
"context"
"fmt"
"net/http"
"time"
kubelessClientset "github.com/kubeless/kubeless/pkg/client/clientset/versioned"
kubelessInformers "github.com/kubeless/kubeless/pkg/client/informers/externalversions"
serviceCatalogClientset "github.com/kubernetes-incubator/service-catalog/pkg/client/clientset_generated/clientset"
serviceCatalogInformers "github.com/kubernetes-incubator/service-catalog/pkg/client/informers_generated/externalversions"
"github.com/kyma-project/kyma/components/binding-usage-controller/internal/controller"
"github.com/kyma-project/kyma/components/binding-usage-controller/internal/controller/usagekind"
"github.com/kyma-project/kyma/components/binding-usage-controller/internal/platform/logger"
bindingUsageClientset "github.com/kyma-project/kyma/components/binding-usage-controller/pkg/client/clientset/versioned"
bindingUsageInformers "github.com/kyma-project/kyma/components/binding-usage-controller/pkg/client/informers/externalversions"
"github.com/kyma-project/kyma/components/binding-usage-controller/pkg/signal"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/vrischmann/envconfig"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/informers"
k8sClientset "k8s.io/client-go/kubernetes"
restclient "k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
)
// informerResyncPeriod defines how often informer will execute relist action. Setting to zero disable resync.
// BEWARE: too short period time will increase the CPU load.
const informerResyncPeriod = time.Minute
// Config holds application configuration
type Config struct {
Logger logger.Config
Port int `envconfig:"default=8080"`
KubeconfigPath string `envconfig:"optional"`
AppliedSBUConfigMapName string `envconfig:"default=applied-sbu-spec"`
AppliedSBUConfigMapNamespace string `envconfig:"default=kyma-system"`
// PluggableSBU is a feature flag, which enables dynamic configuration, which uses UsageKind resources
// todo (pluggable SBU cleanup): remove the FF
PluggableSBU bool `envconfig:"default=false"`
}
func main() {
var cfg Config
err := envconfig.InitWithPrefix(&cfg, "APP")
fatalOnError(errors.Wrap(err, "while reading configuration from environment variables"))
log := logger.New(&cfg.Logger)
// set up signals so we can handle the first shutdown signal gracefully
stopCh := signal.SetupChannel()
k8sConfig, err := newRestClientConfig(cfg.KubeconfigPath)
fatalOnError(err)
// k8s informers
k8sCli, err := k8sClientset.NewForConfig(k8sConfig)
fatalOnError(err)
k8sInformersFactory := informers.NewSharedInformerFactory(k8sCli, informerResyncPeriod)
// ServiceBindingUsage informers
bindingUsageCli, err := bindingUsageClientset.NewForConfig(k8sConfig)
fatalOnError(err)
bindingUsageInformerFactory := bindingUsageInformers.NewSharedInformerFactory(bindingUsageCli, informerResyncPeriod)
// ServiceCatalog informers
serviceCatalogCli, err := serviceCatalogClientset.NewForConfig(k8sConfig)
fatalOnError(err)
serviceCatalogInformerFactory := serviceCatalogInformers.NewSharedInformerFactory(serviceCatalogCli, informerResyncPeriod)
podPresetModifier := controller.NewPodPresetModifier(k8sCli.SettingsV1alpha1())
aggregator := controller.NewResourceSupervisorAggregator()
var kindController *usagekind.Controller
if cfg.PluggableSBU {
log.Info("Pluggable SBU enabled")
cp := dynamic.NewDynamicClientPool(k8sConfig)
kindController = usagekind.NewKindController(
bindingUsageInformerFactory.Servicecatalog().V1alpha1().UsageKinds(),
aggregator,
cp,
log)
} else {
// Kubeless informers
kubelessCli, err := kubelessClientset.NewForConfig(k8sConfig)
fatalOnError(err)
kubelessInformerFactory := kubelessInformers.NewSharedInformerFactory(kubelessCli, informerResyncPeriod)
dSupervisor := controller.NewDeploymentSupervisor(k8sInformersFactory.Apps().V1beta2().Deployments(), k8sCli.AppsV1beta2(), log)
fnSupervisor := controller.NewKubelessFunctionSupervisor(kubelessInformerFactory.Kubeless().V1beta1().Functions(), kubelessCli.KubelessV1beta1(), log)
aggregator.Register(controller.KindDeployment, dSupervisor)
aggregator.Register(controller.KindKubelessFunction, fnSupervisor)
kubelessInformerFactory.Start(stopCh)
}
labelsFetcher := controller.NewBindingLabelsFetcher(serviceCatalogInformerFactory.Servicecatalog().V1beta1().ServiceInstances().Lister(), serviceCatalogInformerFactory.Servicecatalog().V1beta1().ClusterServiceClasses().Lister())
cfgMapClient := k8sCli.CoreV1().ConfigMaps(cfg.AppliedSBUConfigMapNamespace)
usageSpecStorage := controller.NewBindingUsageSpecStorage(cfgMapClient, cfg.AppliedSBUConfigMapName)
ctr := controller.NewServiceBindingUsage(
usageSpecStorage,
bindingUsageCli.ServicecatalogV1alpha1(),
bindingUsageInformerFactory.Servicecatalog().V1alpha1().ServiceBindingUsages(),
serviceCatalogInformerFactory.Servicecatalog().V1beta1().ServiceBindings(),
aggregator,
podPresetModifier,
labelsFetcher,
log,
)
// TODO consider to extract here the cache sync logic from controller
// and use WaitForCacheSync() method defined on factories
k8sInformersFactory.Start(stopCh)
bindingUsageInformerFactory.Start(stopCh)
serviceCatalogInformerFactory.Start(stopCh)
go runStatuszHTTPServer(stopCh, fmt.Sprintf(":%d", cfg.Port), log)
if cfg.PluggableSBU {
go kindController.Run(stopCh)
}
ctr.Run(stopCh)
}
func runStatuszHTTPServer(stop <-chan struct{}, addr string, log logrus.FieldLogger) {
mux := http.NewServeMux()
mux.HandleFunc("/statusz", func(w http.ResponseWriter, req *http.Request) {
w.WriteHeader(http.StatusOK)
fmt.Fprint(w, "OK")
})
srv := &http.Server{Addr: addr, Handler: mux}
go func() {
<-stop
// We received an interrupt signal, shut down.
if err := srv.Shutdown(context.Background()); err != nil {
log.Errorf("HTTP server Shutdown: %v", err)
}
}()
if err := srv.ListenAndServe(); err != http.ErrServerClosed {
log.Errorf("HTTP server ListenAndServe: %v", err)
}
}
func fatalOnError(err error) {
if err != nil {
logrus.Fatal(err.Error())
}
}
func newRestClientConfig(kubeConfigPath string) (*restclient.Config, error) {
if kubeConfigPath != "" {
return clientcmd.BuildConfigFromFlags("", kubeConfigPath)
}
return restclient.InClusterConfig()
}