rebase: add controller runtime dependency

this commits add the controller runtime
and its dependency to the vendor.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

vendor/sigs.k8s.io/controller-runtime/pkg/manager/doc.go

@@ -0,0 +1,21 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+/*
+Package manager is required to create Controllers and provides shared dependencies such as clients, caches, schemes,
+etc.  Controllers must be started by calling Manager.Start.
+*/
+package manager

vendor/sigs.k8s.io/controller-runtime/pkg/manager/internal.go

@@ -0,0 +1,586 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package manager
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"net/http"
+	"sync"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/client-go/rest"
+	"k8s.io/client-go/tools/leaderelection"
+	"k8s.io/client-go/tools/leaderelection/resourcelock"
+	"k8s.io/client-go/tools/record"
+
+	"sigs.k8s.io/controller-runtime/pkg/cache"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	"sigs.k8s.io/controller-runtime/pkg/healthz"
+	logf "sigs.k8s.io/controller-runtime/pkg/internal/log"
+	"sigs.k8s.io/controller-runtime/pkg/metrics"
+	"sigs.k8s.io/controller-runtime/pkg/recorder"
+	"sigs.k8s.io/controller-runtime/pkg/runtime/inject"
+	"sigs.k8s.io/controller-runtime/pkg/webhook"
+)
+
+const (
+	// Values taken from: https://github.com/kubernetes/apiserver/blob/master/pkg/apis/config/v1alpha1/defaults.go
+	defaultLeaseDuration = 15 * time.Second
+	defaultRenewDeadline = 10 * time.Second
+	defaultRetryPeriod   = 2 * time.Second
+
+	defaultReadinessEndpoint = "/readyz"
+	defaultLivenessEndpoint  = "/healthz"
+	defaultMetricsEndpoint   = "/metrics"
+)
+
+var log = logf.RuntimeLog.WithName("manager")
+
+type controllerManager struct {
+	// config is the rest.config used to talk to the apiserver.  Required.
+	config *rest.Config
+
+	// scheme is the scheme injected into Controllers, EventHandlers, Sources and Predicates.  Defaults
+	// to scheme.scheme.
+	scheme *runtime.Scheme
+
+	// leaderElectionRunnables is the set of Controllers that the controllerManager injects deps into and Starts.
+	// These Runnables are managed by lead election.
+	leaderElectionRunnables []Runnable
+	// nonLeaderElectionRunnables is the set of webhook servers that the controllerManager injects deps into and Starts.
+	// These Runnables will not be blocked by lead election.
+	nonLeaderElectionRunnables []Runnable
+
+	cache cache.Cache
+
+	// TODO(directxman12): Provide an escape hatch to get individual indexers
+	// client is the client injected into Controllers (and EventHandlers, Sources and Predicates).
+	client client.Client
+
+	// apiReader is the reader that will make requests to the api server and not the cache.
+	apiReader client.Reader
+
+	// fieldIndexes knows how to add field indexes over the Cache used by this controller,
+	// which can later be consumed via field selectors from the injected client.
+	fieldIndexes client.FieldIndexer
+
+	// recorderProvider is used to generate event recorders that will be injected into Controllers
+	// (and EventHandlers, Sources and Predicates).
+	recorderProvider recorder.Provider
+
+	// resourceLock forms the basis for leader election
+	resourceLock resourcelock.Interface
+
+	// mapper is used to map resources to kind, and map kind and version.
+	mapper meta.RESTMapper
+
+	// metricsListener is used to serve prometheus metrics
+	metricsListener net.Listener
+
+	// metricsExtraHandlers contains extra handlers to register on http server that serves metrics.
+	metricsExtraHandlers map[string]http.Handler
+
+	// healthProbeListener is used to serve liveness probe
+	healthProbeListener net.Listener
+
+	// Readiness probe endpoint name
+	readinessEndpointName string
+
+	// Liveness probe endpoint name
+	livenessEndpointName string
+
+	// Readyz probe handler
+	readyzHandler *healthz.Handler
+
+	// Healthz probe handler
+	healthzHandler *healthz.Handler
+
+	mu             sync.Mutex
+	started        bool
+	startedLeader  bool
+	healthzStarted bool
+
+	// NB(directxman12): we don't just use an error channel here to avoid the situation where the
+	// error channel is too small and we end up blocking some goroutines waiting to report their errors.
+	// errSignal lets us track when we should stop because an error occurred
+	errSignal *errSignaler
+
+	// internalStop is the stop channel *actually* used by everything involved
+	// with the manager as a stop channel, so that we can pass a stop channel
+	// to things that need it off the bat (like the Channel source).  It can
+	// be closed via `internalStopper` (by being the same underlying channel).
+	internalStop <-chan struct{}
+
+	// internalStopper is the write side of the internal stop channel, allowing us to close it.
+	// It and `internalStop` should point to the same channel.
+	internalStopper chan<- struct{}
+
+	// elected is closed when this manager becomes the leader of a group of
+	// managers, either because it won a leader election or because no leader
+	// election was configured.
+	elected chan struct{}
+
+	startCache func(stop <-chan struct{}) error
+
+	// port is the port that the webhook server serves at.
+	port int
+	// host is the hostname that the webhook server binds to.
+	host string
+	// CertDir is the directory that contains the server key and certificate.
+	// if not set, webhook server would look up the server key and certificate in
+	// {TempDir}/k8s-webhook-server/serving-certs
+	certDir string
+
+	webhookServer *webhook.Server
+
+	// leaseDuration is the duration that non-leader candidates will
+	// wait to force acquire leadership.
+	leaseDuration time.Duration
+	// renewDeadline is the duration that the acting master will retry
+	// refreshing leadership before giving up.
+	renewDeadline time.Duration
+	// retryPeriod is the duration the LeaderElector clients should wait
+	// between tries of actions.
+	retryPeriod time.Duration
+}
+
+type errSignaler struct {
+	// errSignal indicates that an error occurred, when closed.  It shouldn't
+	// be written to.
+	errSignal chan struct{}
+
+	// err is the received error
+	err error
+
+	mu sync.Mutex
+}
+
+func (r *errSignaler) SignalError(err error) {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+
+	if err == nil {
+		// non-error, ignore
+		log.Error(nil, "SignalError called without an (with a nil) error, which should never happen, ignoring")
+		return
+	}
+
+	if r.err != nil {
+		// we already have an error, don't try again
+		return
+	}
+
+	// save the error and report it
+	r.err = err
+	close(r.errSignal)
+}
+
+func (r *errSignaler) Error() error {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+
+	return r.err
+}
+
+func (r *errSignaler) GotError() chan struct{} {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+
+	return r.errSignal
+}
+
+// Add sets dependencies on i, and adds it to the list of Runnables to start.
+func (cm *controllerManager) Add(r Runnable) error {
+	cm.mu.Lock()
+	defer cm.mu.Unlock()
+
+	// Set dependencies on the object
+	if err := cm.SetFields(r); err != nil {
+		return err
+	}
+
+	var shouldStart bool
+
+	// Add the runnable to the leader election or the non-leaderelection list
+	if leRunnable, ok := r.(LeaderElectionRunnable); ok && !leRunnable.NeedLeaderElection() {
+		shouldStart = cm.started
+		cm.nonLeaderElectionRunnables = append(cm.nonLeaderElectionRunnables, r)
+	} else {
+		shouldStart = cm.startedLeader
+		cm.leaderElectionRunnables = append(cm.leaderElectionRunnables, r)
+	}
+
+	if shouldStart {
+		// If already started, start the controller
+		go func() {
+			if err := r.Start(cm.internalStop); err != nil {
+				cm.errSignal.SignalError(err)
+			}
+		}()
+	}
+
+	return nil
+}
+
+func (cm *controllerManager) SetFields(i interface{}) error {
+	if _, err := inject.ConfigInto(cm.config, i); err != nil {
+		return err
+	}
+	if _, err := inject.ClientInto(cm.client, i); err != nil {
+		return err
+	}
+	if _, err := inject.APIReaderInto(cm.apiReader, i); err != nil {
+		return err
+	}
+	if _, err := inject.SchemeInto(cm.scheme, i); err != nil {
+		return err
+	}
+	if _, err := inject.CacheInto(cm.cache, i); err != nil {
+		return err
+	}
+	if _, err := inject.InjectorInto(cm.SetFields, i); err != nil {
+		return err
+	}
+	if _, err := inject.StopChannelInto(cm.internalStop, i); err != nil {
+		return err
+	}
+	if _, err := inject.MapperInto(cm.mapper, i); err != nil {
+		return err
+	}
+	return nil
+}
+
+// AddMetricsExtraHandler adds extra handler served on path to the http server that serves metrics.
+func (cm *controllerManager) AddMetricsExtraHandler(path string, handler http.Handler) error {
+	if path == defaultMetricsEndpoint {
+		return fmt.Errorf("overriding builtin %s endpoint is not allowed", defaultMetricsEndpoint)
+	}
+
+	cm.mu.Lock()
+	defer cm.mu.Unlock()
+
+	_, found := cm.metricsExtraHandlers[path]
+	if found {
+		return fmt.Errorf("can't register extra handler by duplicate path %q on metrics http server", path)
+	}
+
+	cm.metricsExtraHandlers[path] = handler
+	log.V(2).Info("Registering metrics http server extra handler", "path", path)
+	return nil
+}
+
+// AddHealthzCheck allows you to add Healthz checker
+func (cm *controllerManager) AddHealthzCheck(name string, check healthz.Checker) error {
+	cm.mu.Lock()
+	defer cm.mu.Unlock()
+
+	if cm.healthzStarted {
+		return fmt.Errorf("unable to add new checker because healthz endpoint has already been created")
+	}
+
+	if cm.healthzHandler == nil {
+		cm.healthzHandler = &healthz.Handler{Checks: map[string]healthz.Checker{}}
+	}
+
+	cm.healthzHandler.Checks[name] = check
+	return nil
+}
+
+// AddReadyzCheck allows you to add Readyz checker
+func (cm *controllerManager) AddReadyzCheck(name string, check healthz.Checker) error {
+	cm.mu.Lock()
+	defer cm.mu.Unlock()
+
+	if cm.healthzStarted {
+		return fmt.Errorf("unable to add new checker because readyz endpoint has already been created")
+	}
+
+	if cm.readyzHandler == nil {
+		cm.readyzHandler = &healthz.Handler{Checks: map[string]healthz.Checker{}}
+	}
+
+	cm.readyzHandler.Checks[name] = check
+	return nil
+}
+
+func (cm *controllerManager) GetConfig() *rest.Config {
+	return cm.config
+}
+
+func (cm *controllerManager) GetClient() client.Client {
+	return cm.client
+}
+
+func (cm *controllerManager) GetScheme() *runtime.Scheme {
+	return cm.scheme
+}
+
+func (cm *controllerManager) GetFieldIndexer() client.FieldIndexer {
+	return cm.fieldIndexes
+}
+
+func (cm *controllerManager) GetCache() cache.Cache {
+	return cm.cache
+}
+
+func (cm *controllerManager) GetEventRecorderFor(name string) record.EventRecorder {
+	return cm.recorderProvider.GetEventRecorderFor(name)
+}
+
+func (cm *controllerManager) GetRESTMapper() meta.RESTMapper {
+	return cm.mapper
+}
+
+func (cm *controllerManager) GetAPIReader() client.Reader {
+	return cm.apiReader
+}
+
+func (cm *controllerManager) GetWebhookServer() *webhook.Server {
+	if cm.webhookServer == nil {
+		cm.webhookServer = &webhook.Server{
+			Port:    cm.port,
+			Host:    cm.host,
+			CertDir: cm.certDir,
+		}
+		if err := cm.Add(cm.webhookServer); err != nil {
+			panic("unable to add webhookServer to the controller manager")
+		}
+	}
+	return cm.webhookServer
+}
+
+func (cm *controllerManager) serveMetrics(stop <-chan struct{}) {
+	handler := promhttp.HandlerFor(metrics.Registry, promhttp.HandlerOpts{
+		ErrorHandling: promhttp.HTTPErrorOnError,
+	})
+	// TODO(JoelSpeed): Use existing Kubernetes machinery for serving metrics
+	mux := http.NewServeMux()
+	mux.Handle(defaultMetricsEndpoint, handler)
+
+	func() {
+		cm.mu.Lock()
+		defer cm.mu.Unlock()
+
+		for path, extraHandler := range cm.metricsExtraHandlers {
+			mux.Handle(path, extraHandler)
+		}
+	}()
+
+	server := http.Server{
+		Handler: mux,
+	}
+	// Run the server
+	go func() {
+		log.Info("starting metrics server", "path", defaultMetricsEndpoint)
+		if err := server.Serve(cm.metricsListener); err != nil && err != http.ErrServerClosed {
+			cm.errSignal.SignalError(err)
+		}
+	}()
+
+	// Shutdown the server when stop is closed
+	<-stop
+	if err := server.Shutdown(context.Background()); err != nil {
+		cm.errSignal.SignalError(err)
+	}
+}
+
+func (cm *controllerManager) serveHealthProbes(stop <-chan struct{}) {
+	// TODO(hypnoglow): refactor locking to use anonymous func in the similar way
+	// it's done in serveMetrics.
+	cm.mu.Lock()
+	mux := http.NewServeMux()
+
+	if cm.readyzHandler != nil {
+		mux.Handle(cm.readinessEndpointName, http.StripPrefix(cm.readinessEndpointName, cm.readyzHandler))
+	}
+	if cm.healthzHandler != nil {
+		mux.Handle(cm.livenessEndpointName, http.StripPrefix(cm.livenessEndpointName, cm.healthzHandler))
+	}
+
+	server := http.Server{
+		Handler: mux,
+	}
+	// Run server
+	go func() {
+		if err := server.Serve(cm.healthProbeListener); err != nil && err != http.ErrServerClosed {
+			cm.errSignal.SignalError(err)
+		}
+	}()
+	cm.healthzStarted = true
+	cm.mu.Unlock()
+
+	// Shutdown the server when stop is closed
+	<-stop
+	if err := server.Shutdown(context.Background()); err != nil {
+		cm.errSignal.SignalError(err)
+	}
+}
+
+func (cm *controllerManager) Start(stop <-chan struct{}) error {
+	// join the passed-in stop channel as an upstream feeding into cm.internalStopper
+	defer close(cm.internalStopper)
+
+	// initialize this here so that we reset the signal channel state on every start
+	cm.errSignal = &errSignaler{errSignal: make(chan struct{})}
+
+	// Metrics should be served whether the controller is leader or not.
+	// (If we don't serve metrics for non-leaders, prometheus will still scrape
+	// the pod but will get a connection refused)
+	if cm.metricsListener != nil {
+		go cm.serveMetrics(cm.internalStop)
+	}
+
+	// Serve health probes
+	if cm.healthProbeListener != nil {
+		go cm.serveHealthProbes(cm.internalStop)
+	}
+
+	go cm.startNonLeaderElectionRunnables()
+
+	if cm.resourceLock != nil {
+		err := cm.startLeaderElection()
+		if err != nil {
+			return err
+		}
+	} else {
+		// Treat not having leader election enabled the same as being elected.
+		close(cm.elected)
+		go cm.startLeaderElectionRunnables()
+	}
+
+	select {
+	case <-stop:
+		// We are done
+		return nil
+	case <-cm.errSignal.GotError():
+		// Error starting a controller
+		return cm.errSignal.Error()
+	}
+}
+
+func (cm *controllerManager) startNonLeaderElectionRunnables() {
+	cm.mu.Lock()
+	defer cm.mu.Unlock()
+
+	cm.waitForCache()
+
+	// Start the non-leaderelection Runnables after the cache has synced
+	for _, c := range cm.nonLeaderElectionRunnables {
+		// Controllers block, but we want to return an error if any have an error starting.
+		// Write any Start errors to a channel so we can return them
+		ctrl := c
+		go func() {
+			if err := ctrl.Start(cm.internalStop); err != nil {
+				cm.errSignal.SignalError(err)
+			}
+			// we use %T here because we don't have a good stand-in for "name",
+			// and the full runnable might not serialize (mutexes, etc)
+			log.V(1).Info("non-leader-election runnable finished", "runnable type", fmt.Sprintf("%T", ctrl))
+		}()
+	}
+}
+
+func (cm *controllerManager) startLeaderElectionRunnables() {
+	cm.mu.Lock()
+	defer cm.mu.Unlock()
+
+	cm.waitForCache()
+
+	// Start the leader election Runnables after the cache has synced
+	for _, c := range cm.leaderElectionRunnables {
+		// Controllers block, but we want to return an error if any have an error starting.
+		// Write any Start errors to a channel so we can return them
+		ctrl := c
+		go func() {
+			if err := ctrl.Start(cm.internalStop); err != nil {
+				cm.errSignal.SignalError(err)
+			}
+			// we use %T here because we don't have a good stand-in for "name",
+			// and the full runnable might not serialize (mutexes, etc)
+			log.V(1).Info("leader-election runnable finished", "runnable type", fmt.Sprintf("%T", ctrl))
+		}()
+	}
+
+	cm.startedLeader = true
+}
+
+func (cm *controllerManager) waitForCache() {
+	if cm.started {
+		return
+	}
+
+	// Start the Cache. Allow the function to start the cache to be mocked out for testing
+	if cm.startCache == nil {
+		cm.startCache = cm.cache.Start
+	}
+	go func() {
+		if err := cm.startCache(cm.internalStop); err != nil {
+			cm.errSignal.SignalError(err)
+		}
+	}()
+
+	// Wait for the caches to sync.
+	// TODO(community): Check the return value and write a test
+	cm.cache.WaitForCacheSync(cm.internalStop)
+	cm.started = true
+}
+
+func (cm *controllerManager) startLeaderElection() (err error) {
+	l, err := leaderelection.NewLeaderElector(leaderelection.LeaderElectionConfig{
+		Lock:          cm.resourceLock,
+		LeaseDuration: cm.leaseDuration,
+		RenewDeadline: cm.renewDeadline,
+		RetryPeriod:   cm.retryPeriod,
+		Callbacks: leaderelection.LeaderCallbacks{
+			OnStartedLeading: func(_ context.Context) {
+				close(cm.elected)
+				cm.startLeaderElectionRunnables()
+			},
+			OnStoppedLeading: func() {
+				// Most implementations of leader election log.Fatal() here.
+				// Since Start is wrapped in log.Fatal when called, we can just return
+				// an error here which will cause the program to exit.
+				cm.errSignal.SignalError(fmt.Errorf("leader election lost"))
+			},
+		},
+	})
+	if err != nil {
+		return err
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	go func() {
+		select {
+		case <-cm.internalStop:
+			cancel()
+		case <-ctx.Done():
+		}
+	}()
+
+	// Start the leader elector process
+	go l.Run(ctx)
+	return nil
+}
+
+func (cm *controllerManager) Elected() <-chan struct{} {
+	return cm.elected
+}

vendor/sigs.k8s.io/controller-runtime/pkg/manager/manager.go

@@ -0,0 +1,443 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package manager
+
+import (
+	"fmt"
+	"net"
+	"net/http"
+	"time"
+
+	"github.com/go-logr/logr"
+
+	"k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/client-go/kubernetes/scheme"
+	"k8s.io/client-go/rest"
+	"k8s.io/client-go/tools/leaderelection/resourcelock"
+	"k8s.io/client-go/tools/record"
+	"sigs.k8s.io/controller-runtime/pkg/cache"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	"sigs.k8s.io/controller-runtime/pkg/client/apiutil"
+	"sigs.k8s.io/controller-runtime/pkg/healthz"
+	internalrecorder "sigs.k8s.io/controller-runtime/pkg/internal/recorder"
+	"sigs.k8s.io/controller-runtime/pkg/leaderelection"
+	"sigs.k8s.io/controller-runtime/pkg/metrics"
+	"sigs.k8s.io/controller-runtime/pkg/recorder"
+	"sigs.k8s.io/controller-runtime/pkg/webhook"
+)
+
+// Manager initializes shared dependencies such as Caches and Clients, and provides them to Runnables.
+// A Manager is required to create Controllers.
+type Manager interface {
+	// Add will set requested dependencies on the component, and cause the component to be
+	// started when Start is called.  Add will inject any dependencies for which the argument
+	// implements the inject interface - e.g. inject.Client.
+	// Depending on if a Runnable implements LeaderElectionRunnable interface, a Runnable can be run in either
+	// non-leaderelection mode (always running) or leader election mode (managed by leader election if enabled).
+	Add(Runnable) error
+
+	// Elected is closed when this manager is elected leader of a group of
+	// managers, either because it won a leader election or because no leader
+	// election was configured.
+	Elected() <-chan struct{}
+
+	// SetFields will set any dependencies on an object for which the object has implemented the inject
+	// interface - e.g. inject.Client.
+	SetFields(interface{}) error
+
+	// AddMetricsExtraHandler adds an extra handler served on path to the http server that serves metrics.
+	// Might be useful to register some diagnostic endpoints e.g. pprof. Note that these endpoints meant to be
+	// sensitive and shouldn't be exposed publicly.
+	// If the simple path -> handler mapping offered here is not enough, a new http server/listener should be added as
+	// Runnable to the manager via Add method.
+	AddMetricsExtraHandler(path string, handler http.Handler) error
+
+	// AddHealthzCheck allows you to add Healthz checker
+	AddHealthzCheck(name string, check healthz.Checker) error
+
+	// AddReadyzCheck allows you to add Readyz checker
+	AddReadyzCheck(name string, check healthz.Checker) error
+
+	// Start starts all registered Controllers and blocks until the Stop channel is closed.
+	// Returns an error if there is an error starting any controller.
+	Start(<-chan struct{}) error
+
+	// GetConfig returns an initialized Config
+	GetConfig() *rest.Config
+
+	// GetScheme returns an initialized Scheme
+	GetScheme() *runtime.Scheme
+
+	// GetClient returns a client configured with the Config. This client may
+	// not be a fully "direct" client -- it may read from a cache, for
+	// instance.  See Options.NewClient for more information on how the default
+	// implementation works.
+	GetClient() client.Client
+
+	// GetFieldIndexer returns a client.FieldIndexer configured with the client
+	GetFieldIndexer() client.FieldIndexer
+
+	// GetCache returns a cache.Cache
+	GetCache() cache.Cache
+
+	// GetEventRecorderFor returns a new EventRecorder for the provided name
+	GetEventRecorderFor(name string) record.EventRecorder
+
+	// GetRESTMapper returns a RESTMapper
+	GetRESTMapper() meta.RESTMapper
+
+	// GetAPIReader returns a reader that will be configured to use the API server.
+	// This should be used sparingly and only when the client does not fit your
+	// use case.
+	GetAPIReader() client.Reader
+
+	// GetWebhookServer returns a webhook.Server
+	GetWebhookServer() *webhook.Server
+}
+
+// Options are the arguments for creating a new Manager
+type Options struct {
+	// Scheme is the scheme used to resolve runtime.Objects to GroupVersionKinds / Resources
+	// Defaults to the kubernetes/client-go scheme.Scheme, but it's almost always better
+	// idea to pass your own scheme in.  See the documentation in pkg/scheme for more information.
+	Scheme *runtime.Scheme
+
+	// MapperProvider provides the rest mapper used to map go types to Kubernetes APIs
+	MapperProvider func(c *rest.Config) (meta.RESTMapper, error)
+
+	// SyncPeriod determines the minimum frequency at which watched resources are
+	// reconciled. A lower period will correct entropy more quickly, but reduce
+	// responsiveness to change if there are many watched resources. Change this
+	// value only if you know what you are doing. Defaults to 10 hours if unset.
+	// there will a 10 percent jitter between the SyncPeriod of all controllers
+	// so that all controllers will not send list requests simultaneously.
+	SyncPeriod *time.Duration
+
+	// LeaderElection determines whether or not to use leader election when
+	// starting the manager.
+	LeaderElection bool
+
+	// LeaderElectionNamespace determines the namespace in which the leader
+	// election configmap will be created.
+	LeaderElectionNamespace string
+
+	// LeaderElectionID determines the name of the configmap that leader election
+	// will use for holding the leader lock.
+	LeaderElectionID string
+
+	// LeaseDuration is the duration that non-leader candidates will
+	// wait to force acquire leadership. This is measured against time of
+	// last observed ack. Default is 15 seconds.
+	LeaseDuration *time.Duration
+	// RenewDeadline is the duration that the acting master will retry
+	// refreshing leadership before giving up. Default is 10 seconds.
+	RenewDeadline *time.Duration
+	// RetryPeriod is the duration the LeaderElector clients should wait
+	// between tries of actions. Default is 2 seconds.
+	RetryPeriod *time.Duration
+
+	// Namespace if specified restricts the manager's cache to watch objects in
+	// the desired namespace Defaults to all namespaces
+	//
+	// Note: If a namespace is specified, controllers can still Watch for a
+	// cluster-scoped resource (e.g Node).  For namespaced resources the cache
+	// will only hold objects from the desired namespace.
+	Namespace string
+
+	// MetricsBindAddress is the TCP address that the controller should bind to
+	// for serving prometheus metrics.
+	// It can be set to "0" to disable the metrics serving.
+	MetricsBindAddress string
+
+	// HealthProbeBindAddress is the TCP address that the controller should bind to
+	// for serving health probes
+	HealthProbeBindAddress string
+
+	// Readiness probe endpoint name, defaults to "readyz"
+	ReadinessEndpointName string
+
+	// Liveness probe endpoint name, defaults to "healthz"
+	LivenessEndpointName string
+
+	// Port is the port that the webhook server serves at.
+	// It is used to set webhook.Server.Port.
+	Port int
+	// Host is the hostname that the webhook server binds to.
+	// It is used to set webhook.Server.Host.
+	Host string
+
+	// CertDir is the directory that contains the server key and certificate.
+	// if not set, webhook server would look up the server key and certificate in
+	// {TempDir}/k8s-webhook-server/serving-certs. The server key and certificate
+	// must be named tls.key and tls.crt, respectively.
+	CertDir string
+	// Functions to all for a user to customize the values that will be injected.
+
+	// NewCache is the function that will create the cache to be used
+	// by the manager. If not set this will use the default new cache function.
+	NewCache cache.NewCacheFunc
+
+	// NewClient will create the client to be used by the manager.
+	// If not set this will create the default DelegatingClient that will
+	// use the cache for reads and the client for writes.
+	NewClient NewClientFunc
+
+	// DryRunClient specifies whether the client should be configured to enforce
+	// dryRun mode.
+	DryRunClient bool
+
+	// EventBroadcaster records Events emitted by the manager and sends them to the Kubernetes API
+	// Use this to customize the event correlator and spam filter
+	EventBroadcaster record.EventBroadcaster
+
+	// Dependency injection for testing
+	newRecorderProvider    func(config *rest.Config, scheme *runtime.Scheme, logger logr.Logger, broadcaster record.EventBroadcaster) (recorder.Provider, error)
+	newResourceLock        func(config *rest.Config, recorderProvider recorder.Provider, options leaderelection.Options) (resourcelock.Interface, error)
+	newMetricsListener     func(addr string) (net.Listener, error)
+	newHealthProbeListener func(addr string) (net.Listener, error)
+}
+
+// NewClientFunc allows a user to define how to create a client
+type NewClientFunc func(cache cache.Cache, config *rest.Config, options client.Options) (client.Client, error)
+
+// Runnable allows a component to be started.
+// It's very important that Start blocks until
+// it's done running.
+type Runnable interface {
+	// Start starts running the component.  The component will stop running
+	// when the channel is closed.  Start blocks until the channel is closed or
+	// an error occurs.
+	Start(<-chan struct{}) error
+}
+
+// RunnableFunc implements Runnable using a function.
+// It's very important that the given function block
+// until it's done running.
+type RunnableFunc func(<-chan struct{}) error
+
+// Start implements Runnable
+func (r RunnableFunc) Start(s <-chan struct{}) error {
+	return r(s)
+}
+
+// LeaderElectionRunnable knows if a Runnable needs to be run in the leader election mode.
+type LeaderElectionRunnable interface {
+	// NeedLeaderElection returns true if the Runnable needs to be run in the leader election mode.
+	// e.g. controllers need to be run in leader election mode, while webhook server doesn't.
+	NeedLeaderElection() bool
+}
+
+// New returns a new Manager for creating Controllers.
+func New(config *rest.Config, options Options) (Manager, error) {
+	// Initialize a rest.config if none was specified
+	if config == nil {
+		return nil, fmt.Errorf("must specify Config")
+	}
+
+	// Set default values for options fields
+	options = setOptionsDefaults(options)
+
+	// Create the mapper provider
+	mapper, err := options.MapperProvider(config)
+	if err != nil {
+		log.Error(err, "Failed to get API Group-Resources")
+		return nil, err
+	}
+
+	// Create the cache for the cached read client and registering informers
+	cache, err := options.NewCache(config, cache.Options{Scheme: options.Scheme, Mapper: mapper, Resync: options.SyncPeriod, Namespace: options.Namespace})
+	if err != nil {
+		return nil, err
+	}
+
+	apiReader, err := client.New(config, client.Options{Scheme: options.Scheme, Mapper: mapper})
+	if err != nil {
+		return nil, err
+	}
+
+	writeObj, err := options.NewClient(cache, config, client.Options{Scheme: options.Scheme, Mapper: mapper})
+	if err != nil {
+		return nil, err
+	}
+
+	if options.DryRunClient {
+		writeObj = client.NewDryRunClient(writeObj)
+	}
+
+	// Create the recorder provider to inject event recorders for the components.
+	// TODO(directxman12): the log for the event provider should have a context (name, tags, etc) specific
+	// to the particular controller that it's being injected into, rather than a generic one like is here.
+	recorderProvider, err := options.newRecorderProvider(config, options.Scheme, log.WithName("events"), options.EventBroadcaster)
+	if err != nil {
+		return nil, err
+	}
+
+	// Create the resource lock to enable leader election)
+	resourceLock, err := options.newResourceLock(config, recorderProvider, leaderelection.Options{
+		LeaderElection:          options.LeaderElection,
+		LeaderElectionID:        options.LeaderElectionID,
+		LeaderElectionNamespace: options.LeaderElectionNamespace,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	// Create the metrics listener. This will throw an error if the metrics bind
+	// address is invalid or already in use.
+	metricsListener, err := options.newMetricsListener(options.MetricsBindAddress)
+	if err != nil {
+		return nil, err
+	}
+
+	// By default we have no extra endpoints to expose on metrics http server.
+	metricsExtraHandlers := make(map[string]http.Handler)
+
+	// Create health probes listener. This will throw an error if the bind
+	// address is invalid or already in use.
+	healthProbeListener, err := options.newHealthProbeListener(options.HealthProbeBindAddress)
+	if err != nil {
+		return nil, err
+	}
+
+	stop := make(chan struct{})
+
+	return &controllerManager{
+		config:                config,
+		scheme:                options.Scheme,
+		cache:                 cache,
+		fieldIndexes:          cache,
+		client:                writeObj,
+		apiReader:             apiReader,
+		recorderProvider:      recorderProvider,
+		resourceLock:          resourceLock,
+		mapper:                mapper,
+		metricsListener:       metricsListener,
+		metricsExtraHandlers:  metricsExtraHandlers,
+		internalStop:          stop,
+		internalStopper:       stop,
+		elected:               make(chan struct{}),
+		port:                  options.Port,
+		host:                  options.Host,
+		certDir:               options.CertDir,
+		leaseDuration:         *options.LeaseDuration,
+		renewDeadline:         *options.RenewDeadline,
+		retryPeriod:           *options.RetryPeriod,
+		healthProbeListener:   healthProbeListener,
+		readinessEndpointName: options.ReadinessEndpointName,
+		livenessEndpointName:  options.LivenessEndpointName,
+	}, nil
+}
+
+// defaultNewClient creates the default caching client
+func defaultNewClient(cache cache.Cache, config *rest.Config, options client.Options) (client.Client, error) {
+	// Create the Client for Write operations.
+	c, err := client.New(config, options)
+	if err != nil {
+		return nil, err
+	}
+
+	return &client.DelegatingClient{
+		Reader: &client.DelegatingReader{
+			CacheReader:  cache,
+			ClientReader: c,
+		},
+		Writer:       c,
+		StatusClient: c,
+	}, nil
+}
+
+// defaultHealthProbeListener creates the default health probes listener bound to the given address
+func defaultHealthProbeListener(addr string) (net.Listener, error) {
+	if addr == "" || addr == "0" {
+		return nil, nil
+	}
+
+	ln, err := net.Listen("tcp", addr)
+	if err != nil {
+		return nil, fmt.Errorf("error listening on %s: %v", addr, err)
+	}
+	return ln, nil
+}
+
+// setOptionsDefaults set default values for Options fields
+func setOptionsDefaults(options Options) Options {
+	// Use the Kubernetes client-go scheme if none is specified
+	if options.Scheme == nil {
+		options.Scheme = scheme.Scheme
+	}
+
+	if options.MapperProvider == nil {
+		options.MapperProvider = func(c *rest.Config) (meta.RESTMapper, error) {
+			return apiutil.NewDynamicRESTMapper(c)
+		}
+	}
+
+	// Allow newClient to be mocked
+	if options.NewClient == nil {
+		options.NewClient = defaultNewClient
+	}
+
+	// Allow newCache to be mocked
+	if options.NewCache == nil {
+		options.NewCache = cache.New
+	}
+
+	// Allow newRecorderProvider to be mocked
+	if options.newRecorderProvider == nil {
+		options.newRecorderProvider = internalrecorder.NewProvider
+	}
+
+	// Allow newResourceLock to be mocked
+	if options.newResourceLock == nil {
+		options.newResourceLock = leaderelection.NewResourceLock
+	}
+
+	if options.newMetricsListener == nil {
+		options.newMetricsListener = metrics.NewListener
+	}
+	leaseDuration, renewDeadline, retryPeriod := defaultLeaseDuration, defaultRenewDeadline, defaultRetryPeriod
+	if options.LeaseDuration == nil {
+		options.LeaseDuration = &leaseDuration
+	}
+
+	if options.RenewDeadline == nil {
+		options.RenewDeadline = &renewDeadline
+	}
+
+	if options.RetryPeriod == nil {
+		options.RetryPeriod = &retryPeriod
+	}
+
+	if options.EventBroadcaster == nil {
+		options.EventBroadcaster = record.NewBroadcaster()
+	}
+
+	if options.ReadinessEndpointName == "" {
+		options.ReadinessEndpointName = defaultReadinessEndpoint
+	}
+
+	if options.LivenessEndpointName == "" {
+		options.LivenessEndpointName = defaultLivenessEndpoint
+	}
+
+	if options.newHealthProbeListener == nil {
+		options.newHealthProbeListener = defaultHealthProbeListener
+	}
+
+	return options
+}

vendor/sigs.k8s.io/controller-runtime/pkg/manager/signals/doc.go

@@ -0,0 +1,20 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Package signals contains libraries for handling signals to gracefully
+// shutdown the manager in combination with Kubernetes pod graceful termination
+// policy.
+package signals

vendor/sigs.k8s.io/controller-runtime/pkg/manager/signals/signal.go

@@ -0,0 +1,43 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package signals
+
+import (
+	"os"
+	"os/signal"
+)
+
+var onlyOneSignalHandler = make(chan struct{})
+
+// SetupSignalHandler registers for SIGTERM and SIGINT. A stop channel is returned
+// which is closed on one of these signals. If a second signal is caught, the program
+// is terminated with exit code 1.
+func SetupSignalHandler() (stopCh <-chan struct{}) {
+	close(onlyOneSignalHandler) // panics when called twice
+
+	stop := make(chan struct{})
+	c := make(chan os.Signal, 2)
+	signal.Notify(c, shutdownSignals...)
+	go func() {
+		<-c
+		close(stop)
+		<-c
+		os.Exit(1) // second signal. Exit directly.
+	}()
+
+	return stop
+}

vendor/sigs.k8s.io/controller-runtime/pkg/manager/signals/signal_posix.go

@@ -0,0 +1,26 @@
+// +build !windows
+
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package signals
+
+import (
+	"os"
+	"syscall"
+)
+
+var shutdownSignals = []os.Signal{os.Interrupt, syscall.SIGTERM}

vendor/sigs.k8s.io/controller-runtime/pkg/manager/signals/signal_windows.go

@@ -0,0 +1,23 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package signals
+
+import (
+	"os"
+)
+
+var shutdownSignals = []os.Signal{os.Interrupt}