forked from cert-manager/cert-manager
/
app.go
158 lines (135 loc) · 5.15 KB
/
app.go
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package main
import (
"fmt"
"os"
"sync"
"time"
"github.com/golang/glog"
"k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/leaderelection"
"k8s.io/client-go/tools/leaderelection/resourcelock"
"k8s.io/client-go/tools/record"
"github.com/jetstack/cert-manager/cmd/ingress-shim/controller"
"github.com/jetstack/cert-manager/cmd/ingress-shim/options"
clientset "github.com/jetstack/cert-manager/pkg/client/clientset/versioned"
intscheme "github.com/jetstack/cert-manager/pkg/client/clientset/versioned/scheme"
informers "github.com/jetstack/cert-manager/pkg/client/informers/externalversions"
"github.com/jetstack/cert-manager/pkg/util/kube"
kubeinformers "github.com/jetstack/cert-manager/third_party/k8s.io/client-go/informers"
)
const controllerAgentName = "ingress-shim-controller"
func Run(opts *options.ControllerOptions, stopCh <-chan struct{}) {
ctrl, kubeCfg, err := buildController(opts, stopCh)
if err != nil {
glog.Fatalf(err.Error())
}
run := func(_ <-chan struct{}) {
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
err := ctrl.Run(2, stopCh)
if err != nil {
glog.Fatalf("error running controller: %s", err.Error())
}
}()
<-stopCh
glog.Infof("Waiting for controller to exit...")
wg.Wait()
glog.Fatalf("Control loops exited")
}
if !opts.LeaderElect {
run(stopCh)
return
}
leaderElectionClient, err := kubernetes.NewForConfig(rest.AddUserAgent(kubeCfg, "leader-election"))
if err != nil {
glog.Fatalf("error creating leader election client: %s", err.Error())
}
startLeaderElection(opts, leaderElectionClient, ctrl.Recorder, run)
panic("unreachable")
}
func buildController(opts *options.ControllerOptions, stopCh <-chan struct{}) (*controller.Controller, *rest.Config, error) {
// Load the users Kubernetes config
kubeCfg, err := kube.KubeConfig(opts.APIServerHost)
if err != nil {
return nil, nil, fmt.Errorf("error creating rest config: %s", err.Error())
}
// Create a Navigator api client
intcl, err := clientset.NewForConfig(kubeCfg)
if err != nil {
return nil, nil, fmt.Errorf("error creating internal group client: %s", err.Error())
}
// Create a Kubernetes api client
cl, err := kubernetes.NewForConfig(kubeCfg)
if err != nil {
return nil, nil, fmt.Errorf("error creating kubernetes client: %s", err.Error())
}
// Create event broadcaster
// Add cert-manager types to the default Kubernetes Scheme so Events can be
// logged properly
intscheme.AddToScheme(scheme.Scheme)
glog.V(4).Info("Creating event broadcaster")
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartLogging(glog.V(4).Infof)
eventBroadcaster.StartRecordingToSink(&corev1.EventSinkImpl{Interface: cl.CoreV1().Events("")})
recorder := eventBroadcaster.NewRecorder(scheme.Scheme, v1.EventSource{Component: controllerAgentName})
// We only create SharedInformerFactories for the --namespace specified to
// watch. If this namespace is blank (i.e. the default, watch all
// namespaces) then the factories will watch all namespaces.
// If it is specified, all operations relating to ClusterIssuer resources
// should be disabled and thus we don't need to also create factories for
// the --cluster-resource-namespace.
sharedInformerFactory := informers.NewFilteredSharedInformerFactory(intcl, time.Second*30, opts.Namespace, nil)
kubeSharedInformerFactory := kubeinformers.NewFilteredSharedInformerFactory(cl, time.Second*30, opts.Namespace, nil)
ctrl := controller.New(
sharedInformerFactory.Certmanager().V1alpha1().Certificates(),
kubeSharedInformerFactory.Extensions().V1beta1().Ingresses(),
sharedInformerFactory.Certmanager().V1alpha1().Issuers(),
sharedInformerFactory.Certmanager().V1alpha1().ClusterIssuers(),
cl,
intcl,
recorder,
opts,
)
sharedInformerFactory.Start(stopCh)
kubeSharedInformerFactory.Start(stopCh)
return ctrl, kubeCfg, nil
}
func startLeaderElection(opts *options.ControllerOptions, leaderElectionClient kubernetes.Interface, recorder record.EventRecorder, run func(<-chan struct{})) {
// Identity used to distinguish between multiple controller manager instances
id, err := os.Hostname()
if err != nil {
glog.Fatalf("error getting hostname: %s", err.Error())
}
// Lock required for leader election
rl := resourcelock.EndpointsLock{
EndpointsMeta: metav1.ObjectMeta{
Namespace: opts.LeaderElectionNamespace,
Name: "ingress-shim-controller",
},
Client: leaderElectionClient.CoreV1(),
LockConfig: resourcelock.ResourceLockConfig{
Identity: id + "-external-ingress-shim-controller",
EventRecorder: recorder,
},
}
// Try and become the leader and start controller manager loops
leaderelection.RunOrDie(leaderelection.LeaderElectionConfig{
Lock: &rl,
LeaseDuration: opts.LeaderElectionLeaseDuration,
RenewDeadline: opts.LeaderElectionRenewDeadline,
RetryPeriod: opts.LeaderElectionRetryPeriod,
Callbacks: leaderelection.LeaderCallbacks{
OnStartedLeading: run,
OnStoppedLeading: func() {
glog.Fatalf("leaderelection lost")
},
},
})
}