zoo

Documentation

Overview

Zookeeper-based mesos-master leaderhip detection. Implements support for optional detector.AllMasters interface.

Index

• type ChildWatcher
• type Client
• type Connector
• type ErrorHandler
• type Factory
• type MasterDetector
  • func NewMasterDetector(zkurls string) (*MasterDetector, error)
  • func (md *MasterDetector) Cancel()
  • func (md *MasterDetector) Detect(f detector.MasterChanged) (err error)
  • func (md *MasterDetector) Done() <-chan struct{}
• type MockConnector
  • func NewMockConnector() *MockConnector
  • func (conn *MockConnector) Children(path string) ([]string, *zk.Stat, error)
  • func (conn *MockConnector) ChildrenW(path string) ([]string, *zk.Stat, <-chan zk.Event, error)
  • func (conn *MockConnector) Close()
  • func (conn *MockConnector) Get(path string) ([]byte, *zk.Stat, error)
• type MockMasterDetector
  • func NewMockMasterDetector(zkurls string) (*MockMasterDetector, error)
  • func (m *MockMasterDetector) ScheduleConnEvent(s zk.State)
  • func (m *MockMasterDetector) ScheduleSessEvent(t zk.EventType)
  • func (m *MockMasterDetector) Start()

Types

type ChildWatcher

type ChildWatcher func(*Client, string)

interface for handling watcher event when zk.EventNodeChildrenChanged.

type Client

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

type Connector

type Connector interface {
	Close()
	Children(string) ([]string, *zk.Stat, error)
	ChildrenW(string) ([]string, *zk.Stat, <-chan zk.Event, error)
	Get(string) ([]byte, *zk.Stat, error)
}

Connector Interface to facade zk.Conn type since github.com/samuel/go-zookeeper/zk does not provide an interface for the zk.Conn object, this allows for mocking and easier testing.

type ErrorHandler

type ErrorHandler func(*Client, error)

interface for handling errors (session and watch related).

type Factory

type Factory interface {
	// contains filtered or unexported methods
}

Factory is an adapter to trap the creation of zk.Conn instances since the official zk API does not expose an interface for zk.Conn.

type MasterDetector

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

Detector uses ZooKeeper to detect new leading master.

func NewMasterDetector

func NewMasterDetector(zkurls string) (*MasterDetector, error)

Internal constructor function

func (*MasterDetector) Cancel

func (md *MasterDetector) Cancel()

func (*MasterDetector) Detect

func (md *MasterDetector) Detect(f detector.MasterChanged) (err error)

the first call to Detect will kickstart a connection to zookeeper. a nil change listener may be spec'd, result of which is a detector that will still listen for master changes and record leaderhip changes internally but no listener would be notified. Detect may be called more than once, and each time the spec'd listener will be added to the list of those receiving notifications.

func (*MasterDetector) Done

func (md *MasterDetector) Done() <-chan struct{}

returns a chan that, when closed, indicates termination of the detector

type MockConnector

type MockConnector struct {
	mock.Mock
}

Impersontates a zk.Connection It implements interface Connector

func NewMockConnector

func NewMockConnector() *MockConnector

func (*MockConnector) Children

func (conn *MockConnector) Children(path string) ([]string, *zk.Stat, error)

func (*MockConnector) ChildrenW

func (conn *MockConnector) ChildrenW(path string) ([]string, *zk.Stat, <-chan zk.Event, error)

func (*MockConnector) Close

func (conn *MockConnector) Close()

func (*MockConnector) Get

func (conn *MockConnector) Get(path string) ([]byte, *zk.Stat, error)

type MockMasterDetector

type MockMasterDetector struct {
	*MasterDetector
	// contains filtered or unexported fields
}

func NewMockMasterDetector

func NewMockMasterDetector(zkurls string) (*MockMasterDetector, error)

func (*MockMasterDetector) ScheduleConnEvent

func (m *MockMasterDetector) ScheduleConnEvent(s zk.State)

func (*MockMasterDetector) ScheduleSessEvent

func (m *MockMasterDetector) ScheduleSessEvent(t zk.EventType)

func (*MockMasterDetector) Start

func (m *MockMasterDetector) Start()