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Documentation

Index

• Constants
• type K8SSink
  • func (s *K8SSink) Delete(key string) error
  • func (s *K8SSink) Informer() cache.SharedIndexInformer
  • func (s *K8SSink) Run(ch <-chan struct{})
  • func (s *K8SSink) SetServices(svcs map[string]string)
  • func (s *K8SSink) Upsert(key string, raw interface{}) error
• type Sink
• type Source
  • func (s *Source) Run(ctx context.Context)
• type TestSink
  • func (s *TestSink) SetServices(raw map[string]string)

Constants

const (
	// K8SQuietPeriod is the time to wait for no service changes before syncing.
	K8SQuietPeriod = 1 * time.Second

	// K8SMaxPeriod is the maximum time to wait before forcing a sync, even
	// if there are active changes going on.
	K8SMaxPeriod = 5 * time.Second
)

Types

type K8SSink

type K8SSink struct {
	Client    kubernetes.Interface // Client is the K8S API client
	Namespace string               // Namespace is the namespace to sync to
	Log       hclog.Logger         // Logger

	// SyncPeriod is the duration to wait between registering or deregistering
	// services in Kubernetes. This can be fairly short since no work will be
	// done if there are no changes.
	SyncPeriod time.Duration
	// contains filtered or unexported fields
}

K8SSink is a Sink implementation that registers services with Kubernetes.

K8SSink also implements controller.Resource and is meant to run as a K8S controller that watches services. This is the primary way that the sink should be run.

func (*K8SSink) Delete

func (s *K8SSink) Delete(key string) error

Delete implements the controller.Resource interface.

func (*K8SSink) Informer

func (s *K8SSink) Informer() cache.SharedIndexInformer

Informer implements the controller.Resource interface. It tells Kubernetes that we want to watch for changes to Services.

func (*K8SSink) Run

func (s *K8SSink) Run(ch <-chan struct{})

Run implements the controller.Backgrounder interface.

func (*K8SSink) SetServices

func (s *K8SSink) SetServices(svcs map[string]string)

SetServices implements Sink

func (*K8SSink) Upsert

func (s *K8SSink) Upsert(key string, raw interface{}) error

Upsert implements the controller.Resource interface.

type Sink

type Sink interface {
	// SetServices is called with the services that should be created.
	// The key is the service name and the destination is the external DNS
	// entry to point to.
	SetServices(map[string]string)
}

Sink is the destination where services are registered.

While in practice we only have one sink (K8S), the interface abstraction makes it easy and possible to test the Source in isolation.

type Source

type Source struct {
	Client       *api.Client  // Consul API client
	Domain       string       // Consul DNS domain
	Sink         Sink         // Sink is the sink to update with services
	Prefix       string       // Prefix is a prefix to prepend to services
	Log          hclog.Logger // Logger
	ConsulK8STag string       // The tag value for services registered
}

Source is the source for the sync that watches Consul services and updates a Sink whenever the set of services to register changes.

func (*Source) Run

func (s *Source) Run(ctx context.Context)

Run is the long-running runloop for watching Consul services and updating the Sink.

type TestSink

type TestSink struct {
	sync.Mutex
	Services map[string]string
}

TestSink implements Sink for tests by just storing the services. Reading/writing the services should be done only while the lock is held.

func (*TestSink) SetServices

func (s *TestSink) SetServices(raw map[string]string)