controller

package
v0.0.3 Latest Latest
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 Go to latest Published: Oct 5, 2017 License: Apache-2.0 Imports: 21 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	// BurstReplicas is the maximum amount of requests in a row for CRUD operations on resources by controllers,
	// to avoid unintentional DoS
	BurstReplicas uint = 250
)
View Source 
const (
	// If a watch drops a delete event for a pod, it'll take this long
	// before a dormant controller waiting for those packets is woken up anyway. It is
	// specifically targeted at the case where some problem prevents an update
	// of expectations, without it the controller could stay asleep forever. This should
	// be set based on the expected latency of watch events.
	//
	// Currently a controller can service (create *and* observe the watch events for said
	// creation) about 10 pods a second, so it takes about 1 min to service
	// 500 pods. Just creation is limited to 20qps, and watching happens with ~10-30s
	// latency/pod at the scale of 3000 pods over 100 nodes.
	ExpectationsTimeout = 5 * time.Minute
)

Variables

View Source 
var ExpKeyFunc = func(obj interface{}) (string, error) {
	if e, ok := obj.(*ControlleeExpectations); ok {
		return e.key, nil
	}
	return "", fmt.Errorf("Could not find key for obj %#v", obj)
}

ExpKeyFunc to parse out the key from a ControlleeExpectation

View Source 
var (
	KeyFunc = cache.DeletionHandlingMetaNamespaceKeyFunc
)
View Source 
var UIDSetKeyFunc = func(obj interface{}) (string, error) {
	if u, ok := obj.(*UIDSet); ok {
		return u.key, nil
	}
	return "", fmt.Errorf("Could not find key for obj %#v", obj)
}

UIDSetKeyFunc to parse out the key from a UIDSet.

View Source 
var UpdateTaintBackoff = wait.Backoff{
	Steps:    5,
	Duration: 100 * time.Millisecond,
	Jitter:   1.0,
}

Functions

func Dequeue 

func Dequeue(s cache.Store, w workqueue.RateLimitingInterface, dispatch ControllerDispatch) bool

func HandlePanic 

func HandlePanic()

func NewListWatchFromClient 

func NewListWatchFromClient(c cache.Getter, resource string, namespace string, fieldSelector fields.Selector, labelSelector labels.Selector) *cache.ListWatch

NewListWatchFromClient creates a new ListWatch from the specified client, resource, namespace and field selector.

func NewResourceEventHandlerFuncsForFunc 

func NewResourceEventHandlerFuncsForFunc(f func(interface{})) cache.ResourceEventHandlerFuncs

func NewResourceEventHandlerFuncsForWorkqueue 

func NewResourceEventHandlerFuncsForWorkqueue(queue workqueue.RateLimitingInterface) cache.ResourceEventHandlerFuncs

func NoResyncPeriodFunc 

func NoResyncPeriodFunc() time.Duration

Returns 0 for resyncPeriod in case resyncing is not needed.

func VirtualMachineKey 

func VirtualMachineKey(vm *v1.VirtualMachine) string

func VirtualMachineKeys 

func VirtualMachineKeys(vms []v1.VirtualMachine) []string

Types

type ControlleeExpectations 

type ControlleeExpectations struct {
	// contains filtered or unexported fields
}

ControlleeExpectations track controllee creates/deletes.

func (*ControlleeExpectations) Add 

func (e *ControlleeExpectations) Add(add, del int64)

Add increments the add and del counters.

func (*ControlleeExpectations) Fulfilled 

func (e *ControlleeExpectations) Fulfilled() bool

Fulfilled returns true if this expectation has been fulfilled.

func (*ControlleeExpectations) GetExpectations 

func (e *ControlleeExpectations) GetExpectations() (int64, int64)

GetExpectations returns the add and del expectations of the controllee.

type Controller 

type Controller struct {
	// contains filtered or unexported fields
}

func NewController 

func NewController(lw cache.ListerWatcher, queue workqueue.RateLimitingInterface, objType runtime.Object, dispatch ControllerDispatch) (cache.Store, *Controller)

func NewControllerFromInformer 

func NewControllerFromInformer(indexer cache.Store, informer cache.Controller, queue workqueue.RateLimitingInterface, dispatch ControllerDispatch) (cache.Store, *Controller)

func (*Controller) Run 

func (c *Controller) Run(threadiness int, stopCh chan struct{})

func (*Controller) ShutDownQueue 

func (c *Controller) ShutDownQueue()

Shut down the embedded queue. After the shutdown was issued, all items already in the queue will be processed but no new items will be accepted. It is possible to wait via #WaitUntilDone() until the last item was processed.

func (*Controller) StartInformer 

func (c *Controller) StartInformer(stopCh chan struct{})

func (*Controller) WaitForSync 

func (c *Controller) WaitForSync(stopCh chan struct{})

type ControllerDispatch 

type ControllerDispatch interface {
	Execute(cache.Store, workqueue.RateLimitingInterface, interface{})
}

type ControllerExpectations 

type ControllerExpectations struct {
	cache.Store
}

ControllerExpectations is a cache mapping controllers to what they expect to see before being woken up for a sync.

func NewControllerExpectations 

func NewControllerExpectations() *ControllerExpectations

NewControllerExpectations returns a store for ControllerExpectations.

func (*ControllerExpectations) CreationObserved 

func (r *ControllerExpectations) CreationObserved(controllerKey string)

CreationObserved atomically decrements the `add` expectation count of the given controller.

func (*ControllerExpectations) DeleteExpectations 

func (r *ControllerExpectations) DeleteExpectations(controllerKey string)

DeleteExpectations deletes the expectations of the given controller from the TTLStore.

func (*ControllerExpectations) DeletionObserved 

func (r *ControllerExpectations) DeletionObserved(controllerKey string)

DeletionObserved atomically decrements the `del` expectation count of the given controller.

func (*ControllerExpectations) ExpectCreations 

func (r *ControllerExpectations) ExpectCreations(controllerKey string, adds int) error

func (*ControllerExpectations) ExpectDeletions 

func (r *ControllerExpectations) ExpectDeletions(controllerKey string, dels int) error

func (*ControllerExpectations) GetExpectations 

func (r *ControllerExpectations) GetExpectations(controllerKey string) (*ControlleeExpectations, bool, error)

GetExpectations returns the ControlleeExpectations of the given controller.

func (*ControllerExpectations) LowerExpectations 

func (r *ControllerExpectations) LowerExpectations(controllerKey string, add, del int)

Decrements the expectation counts of the given controller.

func (*ControllerExpectations) RaiseExpectations 

func (r *ControllerExpectations) RaiseExpectations(controllerKey string, add, del int)

Increments the expectation counts of the given controller.

func (*ControllerExpectations) SatisfiedExpectations 

func (r *ControllerExpectations) SatisfiedExpectations(controllerKey string) bool

SatisfiedExpectations returns true if the required adds/dels for the given controller have been observed. Add/del counts are established by the controller at sync time, and updated as controllees are observed by the controller manager.

func (*ControllerExpectations) SetExpectations 

func (r *ControllerExpectations) SetExpectations(controllerKey string, add, del int) error

SetExpectations registers new expectations for the given controller. Forgets existing expectations.

type ControllerExpectationsInterface 

type ControllerExpectationsInterface interface {
	GetExpectations(controllerKey string) (*ControlleeExpectations, bool, error)
	SatisfiedExpectations(controllerKey string) bool
	DeleteExpectations(controllerKey string)
	SetExpectations(controllerKey string, add, del int) error
	ExpectCreations(controllerKey string, adds int) error
	ExpectDeletions(controllerKey string, dels int) error
	CreationObserved(controllerKey string)
	DeletionObserved(controllerKey string)
	RaiseExpectations(controllerKey string, add, del int)
	LowerExpectations(controllerKey string, add, del int)
}

ControllerExpectationsInterface is an interface that allows users to set and wait on expectations. Only abstracted out for testing. Warning: if using KeyFunc it is not safe to use a single ControllerExpectationsInterface with different types of controllers, because the keys might conflict across types.

type ControllerFunc 

type ControllerFunc func(cache.Store, workqueue.RateLimitingInterface, interface{})

type Expectations 

type Expectations interface {
	Fulfilled() bool
}

Expectations are either fulfilled, or expire naturally.

type KubeInformerFactory 

type KubeInformerFactory interface {
	// Starts any informers that have not been started yet
	// This function is thread safe and idempotent
	Start(stopCh <-chan struct{})

	// Watches for vm objects
	VM() cache.SharedIndexInformer
	// Watches for migration objects
	Migration() cache.SharedIndexInformer

	VMReplicaSet() cache.SharedIndexInformer
	// Watches for pods related only to kubevirt
	KubeVirtPod() cache.SharedIndexInformer
}

func NewKubeInformerFactory 

func NewKubeInformerFactory(restClient *rest.RESTClient, clientSet kubecli.KubevirtClient) KubeInformerFactory

type ResyncPeriodFunc 

type ResyncPeriodFunc func() time.Duration

func StaticResyncPeriodFunc 

func StaticResyncPeriodFunc(resyncPeriod time.Duration) ResyncPeriodFunc

StaticResyncPeriodFunc returns the resync period specified

type UIDSet 

type UIDSet struct {
	sets.String
	// contains filtered or unexported fields
}

UIDSet holds a key and a set of UIDs. Used by the UIDTrackingControllerExpectations to remember which UID it has seen/still waiting for.

type UIDTrackingControllerExpectations 

type UIDTrackingControllerExpectations struct {
	ControllerExpectationsInterface
	// contains filtered or unexported fields
}

UIDTrackingControllerExpectations tracks the UID of the pods it deletes. This cache is needed over plain old expectations to safely handle graceful deletion. The desired behavior is to treat an update that sets the DeletionTimestamp on an object as a delete. To do so consistently, one needs to remember the expected deletes so they aren't double counted. TODO: Track creates as well (#22599)

func NewUIDTrackingControllerExpectations 

func NewUIDTrackingControllerExpectations(ce ControllerExpectationsInterface) *UIDTrackingControllerExpectations

NewUIDTrackingControllerExpectations returns a wrapper around ControllerExpectations that is aware of deleteKeys.

func (*UIDTrackingControllerExpectations) DeleteExpectations 

func (u *UIDTrackingControllerExpectations) DeleteExpectations(rcKey string)

DeleteExpectations deletes the UID set and invokes DeleteExpectations on the underlying ControllerExpectationsInterface.

func (*UIDTrackingControllerExpectations) DeletionObserved 

func (u *UIDTrackingControllerExpectations) DeletionObserved(rcKey, deleteKey string)

DeletionObserved records the given deleteKey as a deletion, for the given rc.

func (*UIDTrackingControllerExpectations) ExpectDeletions 

func (u *UIDTrackingControllerExpectations) ExpectDeletions(rcKey string, deletedKeys []string) error

ExpectDeletions records expectations for the given deleteKeys, against the given controller.

func (*UIDTrackingControllerExpectations) GetUIDs 

func (u *UIDTrackingControllerExpectations) GetUIDs(controllerKey string) sets.String

GetUIDs is a convenience method to avoid exposing the set of expected uids. The returned set is not thread safe, all modifications must be made holding the uidStoreLock.

Source Files

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