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controller.go
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controller.go
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package app
import (
"fmt"
"os"
"sync"
"time"
"github.com/golang/glog"
"k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
kubeinformers "k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
kubescheme "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/clientcmd"
"k8s.io/client-go/tools/leaderelection"
"k8s.io/client-go/tools/leaderelection/resourcelock"
"k8s.io/client-go/tools/record"
"github.com/jetstack/navigator/cmd/controller/app/options"
clientset "github.com/jetstack/navigator/pkg/client/clientset/versioned"
intscheme "github.com/jetstack/navigator/pkg/client/clientset/versioned/scheme"
informers "github.com/jetstack/navigator/pkg/client/informers/externalversions"
"github.com/jetstack/navigator/pkg/controllers"
)
const controllerAgentName = "navigator-controller"
func Run(opts *options.ControllerOptions, stopCh <-chan struct{}) {
ctx, kubeCfg, err := buildControllerContext(opts)
if err != nil {
glog.Fatalf(err.Error())
}
run := func(_ <-chan struct{}) {
var wg sync.WaitGroup
var ctrls = make(map[string]controllers.Interface)
for n, fn := range controllers.Known() {
ctrls[n] = fn(ctx)
}
for n, fn := range ctrls {
wg.Add(1)
go func(n string, fn controllers.Interface) {
defer wg.Done()
glog.V(4).Infof("Starting %s controller", n)
err := fn(2, stopCh)
if err != nil {
glog.Fatalf("error running %s controller: %s", n, err.Error())
}
}(n, fn)
}
glog.V(4).Infof("Starting shared informer factories")
ctx.KubeSharedInformerFactory.Start(stopCh)
ctx.SharedInformerFactory.Start(stopCh)
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, ctx.Recorder, run)
panic("unreachable")
}
func buildControllerContext(opts *options.ControllerOptions) (*controllers.Context, *rest.Config, error) {
// Load the users Kubernetes config
kubeCfg, err := KubeConfig(opts.APIServerHost)
if err != nil {
return nil, nil, fmt.Errorf("error creating rest config: %s", err.Error())
}
// Create a Navigator api client
cl, 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
kubecl, 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(kubescheme.Scheme)
glog.V(4).Info("Creating event broadcaster")
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartLogging(glog.V(4).Infof)
eventBroadcaster.StartRecordingToSink(&corev1.EventSinkImpl{Interface: kubecl.CoreV1().Events("")})
recorder := eventBroadcaster.NewRecorder(kubescheme.Scheme, v1.EventSource{Component: controllerAgentName})
sharedInformerFactory := informers.NewFilteredSharedInformerFactory(cl, time.Second*30, opts.Namespace, nil)
kubeSharedInformerFactory := kubeinformers.NewFilteredSharedInformerFactory(kubecl, time.Second*30, opts.Namespace, nil)
return &controllers.Context{
Client: kubecl,
NavigatorClient: cl,
Recorder: recorder,
KubeSharedInformerFactory: kubeSharedInformerFactory,
SharedInformerFactory: sharedInformerFactory,
Namespace: opts.Namespace,
}, 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
// TODO Switch to ConfigMap based leader election for consistency with Pilot leader election.
rl := resourcelock.EndpointsLock{
EndpointsMeta: metav1.ObjectMeta{
Namespace: opts.LeaderElectionNamespace,
Name: "navigator-controller",
},
Client: leaderElectionClient.CoreV1(),
LockConfig: resourcelock.ResourceLockConfig{
Identity: id + "-external-navigator-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")
},
},
})
}
// KubeConfig will return a rest.Config for communicating with the Kubernetes API server.
// If apiServerHost is specified, a config without authentication that is configured
// to talk to the apiServerHost URL will be returned. Else, the in-cluster config will be loaded,
// and failing this, the config will be loaded from the users local kubeconfig directory
func KubeConfig(apiServerHost string) (*rest.Config, error) {
var err error
var cfg *rest.Config
if len(apiServerHost) > 0 {
cfg = new(rest.Config)
cfg.Host = apiServerHost
} else if cfg, err = rest.InClusterConfig(); err != nil {
apiCfg, err := clientcmd.NewDefaultClientConfigLoadingRules().Load()
if err != nil {
return nil, fmt.Errorf("error loading cluster config: %s", err.Error())
}
cfg, err = clientcmd.NewDefaultClientConfig(*apiCfg, &clientcmd.ConfigOverrides{}).ClientConfig()
if err != nil {
return nil, fmt.Errorf("error loading cluster client config: %s", err.Error())
}
}
return cfg, nil
}