zk

package
v0.0.0-...-57b3726 Latest Latest
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This package is not in the latest version of its module.

 Go to latest Published: Dec 16, 2014 License: BSD-3-Clause Imports: 21 Imported by: 4

Documentation

Index

Constants

View Source 
const (
	EventNodeCreated         = EventType(1)
	EventNodeDeleted         = EventType(2)
	EventNodeDataChanged     = EventType(3)
	EventNodeChildrenChanged = EventType(4)

	EventSession     = EventType(-1)
	EventNotWatching = EventType(-2)
)
View Source 
const (
	StateUnknown           = State(-1)
	StateDisconnected      = State(0)
	StateConnecting        = State(1)
	StateSyncConnected     = State(3)
	StateAuthFailed        = State(4)
	StateConnectedReadOnly = State(5)
	StateSaslAuthenticated = State(6)
	StateExpired           = State(-112)

	StateConnected  = State(100)
	StateHasSession = State(101)
)
View Source 
const (
	FlagEphemeral = 1
	FlagSequence  = 2
)
View Source 
const (
	PermRead = 1 << iota
	PermWrite
	PermCreate
	PermDelete
	PermAdmin
	PermAll = 0x1f
)

Constants for ACL permissions

View Source 
const (
	DefaultServerTickTime                 = 2000
	DefaultServerInitLimit                = 10
	DefaultServerSyncLimit                = 5
	DefaultServerAutoPurgeSnapRetainCount = 3
	DefaultPeerPort                       = 2888
	DefaultLeaderElectionPort             = 3888
)
View Source 
const (
	DefaultPort = 2181
)

Variables

View Source 
var (
	ErrConnectionClosed        = errors.New("zk: connection closed")
	ErrUnknown                 = errors.New("zk: unknown error")
	ErrAPIError                = errors.New("zk: api error")
	ErrNoNode                  = errors.New("zk: node does not exist")
	ErrNoAuth                  = errors.New("zk: not authenticated")
	ErrBadVersion              = errors.New("zk: version conflict")
	ErrNoChildrenForEphemerals = errors.New("zk: ephemeral nodes may not have children")
	ErrNodeExists              = errors.New("zk: node already exists")
	ErrNotEmpty                = errors.New("zk: node has children")
	ErrSessionExpired          = errors.New("zk: session has been expired by the server")
	ErrInvalidACL              = errors.New("zk: invalid ACL specified")
	ErrAuthFailed              = errors.New("zk: client authentication failed")
	ErrClosing                 = errors.New("zk: zookeeper is closing")
	ErrNothing                 = errors.New("zk: no server responsees to process")
	ErrSessionMoved            = errors.New("zk: session moved to another server, so operation is ignored")
	ErrRequestTimeout          = errors.New("zk: request timed out")
)
View Source 
var (
	ErrDeadlock    = errors.New("zk: trying to acquire a lock twice")
	ErrNotLocked   = errors.New("zk: not locked")
	ErrLockTimeout = errors.New("zk: timeout trying to acquire lock")
)
View Source 
var (
	ErrUnhandledFieldType = errors.New("zk: unhandled field type")
	ErrPtrExpected        = errors.New("zk: encode/decode expect a non-nil pointer to struct")
	ErrShortBuffer        = errors.New("zk: buffer too small")
)
View Source 
var ErrNoServer = errors.New("zk: could not connect to a server")

Functions

func StartTracer 

func StartTracer(listenAddr, serverAddr string)

Types

type ACL 

type ACL struct {
	Perms  int32
	Scheme string
	ID     string
}

func AuthACL 

func AuthACL(perms int32) []ACL

AuthACL produces an ACL list containing a single ACL which uses the provided permissions, with the scheme "auth", and ID "", which is used by ZooKeeper to represent any authenticated user.

func DigestACL 

func DigestACL(perms int32, user, password string) []ACL

func WorldACL 

func WorldACL(perms int32) []ACL

WorldACL produces an ACL list containing a single ACL which uses the provided permissions, with the scheme "world", and ID "anyone", which is used by ZooKeeper to represent any user at all.

type CheckVersionRequest 

type CheckVersionRequest PathVersionRequest

type Conn 

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

func Connect 

func Connect(servers []string, recvTimeout time.Duration) (*Conn, <-chan Event, error)

func ConnectWithDialer 

func ConnectWithDialer(servers []string, recvTimeout time.Duration, dialer Dialer) (*Conn, <-chan Event, error)

func (*Conn) AddAuth 

func (c *Conn) AddAuth(scheme string, auth []byte) error

func (*Conn) Children 

func (c *Conn) Children(path string) ([]string, *Stat, error)

func (*Conn) ChildrenW 

func (c *Conn) ChildrenW(path string) ([]string, *Stat, <-chan Event, error)

func (*Conn) Close 

func (c *Conn) Close()

func (*Conn) Create 

func (c *Conn) Create(path string, data []byte, flags int32, acl []ACL) (string, error)

func (*Conn) CreateProtectedEphemeralSequential 

func (c *Conn) CreateProtectedEphemeralSequential(path string, data []byte, acl []ACL) (string, error)

CreateProtectedEphemeralSequential fixes a race condition if the server crashes after it creates the node. On reconnect the session may still be valid so the ephemeral node still exists. Therefore, on reconnect we need to check if a node with a GUID generated on create exists.

func (*Conn) Delete 

func (c *Conn) Delete(path string, version int32) error

func (*Conn) Exists 

func (c *Conn) Exists(path string) (bool, *Stat, error)

func (*Conn) ExistsW 

func (c *Conn) ExistsW(path string) (bool, *Stat, <-chan Event, error)

func (*Conn) Get 

func (c *Conn) Get(path string) ([]byte, *Stat, error)

func (*Conn) GetACL 

func (c *Conn) GetACL(path string) ([]ACL, *Stat, error)

func (*Conn) GetW 

func (c *Conn) GetW(path string) ([]byte, *Stat, <-chan Event, error)

GetW returns the contents of a znode and sets a watch

func (*Conn) Multi 

func (c *Conn) Multi(ops MultiOps) error

func (*Conn) NewLock 

func (c *Conn) NewLock(path string, acl []ACL) Locker

func (*Conn) Reconnect 

func (c *Conn) Reconnect() error

Reconnect closes the underlying network connection to zookeeper This will trigger both the send and recv loops to exit and requests to flush and then we will automatically attempt to reconnect

func (*Conn) Set 

func (c *Conn) Set(path string, data []byte, version int32) (*Stat, error)

func (*Conn) SetACL 

func (c *Conn) SetACL(path string, acl []ACL, version int32) (*Stat, error)

func (*Conn) State 

func (c *Conn) State() State

func (*Conn) Sync 

func (c *Conn) Sync(path string) (string, error)

func (*Conn) UpdateAddrs 

func (c *Conn) UpdateAddrs(addrs []string) error

type CreateRequest 

type CreateRequest struct {
	Path  string
	Data  []byte
	Acl   []ACL
	Flags int32
}

type DeleteRequest 

type DeleteRequest PathVersionRequest

type Dialer 

type Dialer func(network, address string, timeout time.Duration) (net.Conn, error)

type ErrCode 

type ErrCode int32

type ErrMissingServerConfigField 

type ErrMissingServerConfigField string

func (ErrMissingServerConfigField) Error 

func (e ErrMissingServerConfigField) Error() string

type Event 

type Event struct {
	Type  EventType
	State State
	Path  string // For non-session events, the path of the watched node.
	Err   error
}

type EventType 

type EventType int32

func (EventType) String 

func (t EventType) String() string

type Lock 

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

func NewLock 

func NewLock(c *Conn, path string, acl []ACL) *Lock

func (*Lock) Lock 

func (l *Lock) Lock() error

Lock attempts to acquire a lock. Uses the recipe http://zookeeper.apache.org/doc/trunk/recipes.html#sc_recipes_Locks. Timeout achieved by first creating the lock node and then waiting X secs. If lock not yet acquired it will delete and then return. Does not account for initial request taking too long

func (*Lock) SetTTL 

func (l *Lock) SetTTL(d time.Duration)

SetTTL sets the max time that the lock should live for

func (*Lock) SetTimeout 

func (l *Lock) SetTimeout(d time.Duration)

SetTimeout sets the time we will wait to acquire the lock, bail out if time is exceeded

func (*Lock) Unlock 

func (l *Lock) Unlock() error

type Locker 

type Locker interface {
	Lock() error
	Unlock() error
	SetTTL(time.Duration)
	SetTimeout(time.Duration)
}

type MultiOps 

type MultiOps struct {
	Create  []CreateRequest
	Delete  []DeleteRequest
	SetData []SetDataRequest
	Check   []CheckVersionRequest
}

type PathVersionRequest 

type PathVersionRequest struct {
	Path    string
	Version int32
}

type Server 

type Server struct {
	JarPath    string
	ConfigPath string
	// contains filtered or unexported fields
}

func (*Server) Start 

func (srv *Server) Start() error

func (*Server) Stop 

func (srv *Server) Stop() error

type ServerConfig 

type ServerConfig struct {
	TickTime                 int    // Number of milliseconds of each tick
	InitLimit                int    // Number of ticks that the initial synchronization phase can take
	SyncLimit                int    // Number of ticks that can pass between sending a request and getting an acknowledgement
	DataDir                  string // Direcrory where the snapshot is stored
	ClientPort               int    // Port at which clients will connect
	AutoPurgeSnapRetainCount int    // Number of snapshots to retain in dataDir
	AutoPurgePurgeInterval   int    // Purge task internal in hours (0 to disable auto purge)
	Servers                  []ServerConfigServer
}

func (ServerConfig) Marshall 

func (sc ServerConfig) Marshall(w io.Writer) error

type ServerConfigServer 

type ServerConfigServer struct {
	ID                 int
	Host               string
	PeerPort           int
	LeaderElectionPort int
}

type SetDataRequest 

type SetDataRequest struct {
	Path    string
	Data    []byte
	Version int32
}

type Stat 

type Stat struct {
	Czxid          int64 // The zxid of the change that caused this znode to be created.
	Mzxid          int64 // The zxid of the change that last modified this znode.
	Ctime          int64 // The time in milliseconds from epoch when this znode was created.
	Mtime          int64 // The time in milliseconds from epoch when this znode was last modified.
	Version        int32 // The number of changes to the data of this znode.
	Cversion       int32 // The number of changes to the children of this znode.
	Aversion       int32 // The number of changes to the ACL of this znode.
	EphemeralOwner int64 // The session id of the owner of this znode if the znode is an ephemeral node. If it is not an ephemeral node, it will be zero.
	DataLength     int32 // The length of the data field of this znode.
	NumChildren    int32 // The number of children of this znode.
	Pzxid          int64 // last modified children
}

type State 

type State int32

func (State) String 

func (s State) String() string

type TestCluster 

type TestCluster struct {
	Path    string
	Servers []TestServer
}

func StartTestCluster 

func StartTestCluster(size int) (*TestCluster, error)

func (*TestCluster) Connect 

func (ts *TestCluster) Connect(idx int) (*Conn, error)

func (*TestCluster) ConnectAll 

func (ts *TestCluster) ConnectAll() (*Conn, error)

func (*TestCluster) Stop 

func (ts *TestCluster) Stop() error

type TestServer 

type TestServer struct {
	Port int
	Path string
	Srv  *Server
}

Source Files

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