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constants.go
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constants.go
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package zk
import (
"errors"
)
const (
protocolVersion = 0
DefaultPort = 2181
)
const (
opNotify = 0
opCreate = 1
opDelete = 2
opExists = 3
opGetData = 4
opSetData = 5
opGetAcl = 6
opSetAcl = 7
opGetChildren = 8
opSync = 9
opPing = 11
opGetChildren2 = 12
opCheck = 13
opMulti = 14
opClose = -11
opSetAuth = 100
opSetWatches = 101
// Not in protocol, used internally
opWatcherEvent = -2
)
const (
EventNodeCreated = EventType(1)
EventNodeDeleted = EventType(2)
EventNodeDataChanged = EventType(3)
EventNodeChildrenChanged = EventType(4)
EventSession = EventType(-1)
EventNotWatching = EventType(-2)
)
var (
eventNames = map[EventType]string{
EventNodeCreated: "EventNodeCreated",
EventNodeDeleted: "EventNodeDeleted",
EventNodeDataChanged: "EventNodeDataChanged",
EventNodeChildrenChanged: "EventNodeChildrenChanged",
EventSession: "EventSession",
EventNotWatching: "EventNotWatching",
}
)
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)
// StateAuthFailed = State(-113)
StateConnected = State(100)
StateHasSession = State(101)
)
const (
FlagEphemeral = 1
FlagSequence = 2
)
var (
stateNames = map[State]string{
StateUnknown: "StateUnknown",
StateDisconnected: "StateDisconnected",
StateSyncConnected: "StateSyncConnected",
StateConnectedReadOnly: "StateConnectedReadOnly",
StateSaslAuthenticated: "StateSaslAuthenticated",
StateExpired: "StateExpired",
StateAuthFailed: "StateAuthFailed",
StateConnecting: "StateConnecting",
StateConnected: "StateConnected",
StateHasSession: "StateHasSession",
}
)
type State int32
func (s State) String() string {
if name := stateNames[s]; name != "" {
return name
}
return "Unknown"
}
type ErrCode int32
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")
// ErrInvalidCallback = errors.New("zk: invalid callback specified")
errCodeToError = map[ErrCode]error{
0: nil,
errAPIError: ErrAPIError,
errNoNode: ErrNoNode,
errNoAuth: ErrNoAuth,
errBadVersion: ErrBadVersion,
errNoChildrenForEphemerals: ErrNoChildrenForEphemerals,
errNodeExists: ErrNodeExists,
errNotEmpty: ErrNotEmpty,
errSessionExpired: ErrSessionExpired,
// errInvalidCallback: ErrInvalidCallback,
errInvalidAcl: ErrInvalidACL,
errAuthFailed: ErrAuthFailed,
errClosing: ErrClosing,
errNothing: ErrNothing,
errSessionMoved: ErrSessionMoved,
}
)
func (e ErrCode) toError() error {
if err, ok := errCodeToError[e]; ok {
return err
}
return ErrUnknown
}
const (
errOk = 0
// System and server-side errors
errSystemError = -1
errRuntimeInconsistency = -2
errDataInconsistency = -3
errConnectionLoss = -4
errMarshallingError = -5
errUnimplemented = -6
errOperationTimeout = -7
errBadArguments = -8
errInvalidState = -9
// API errors
errAPIError = ErrCode(-100)
errNoNode = ErrCode(-101) // *
errNoAuth = ErrCode(-102)
errBadVersion = ErrCode(-103) // *
errNoChildrenForEphemerals = ErrCode(-108)
errNodeExists = ErrCode(-110) // *
errNotEmpty = ErrCode(-111)
errSessionExpired = ErrCode(-112)
errInvalidCallback = ErrCode(-113)
errInvalidAcl = ErrCode(-114)
errAuthFailed = ErrCode(-115)
errClosing = ErrCode(-116)
errNothing = ErrCode(-117)
errSessionMoved = ErrCode(-118)
)
// Constants for ACL permissions
const (
PermRead = 1 << iota
PermWrite
PermCreate
PermDelete
PermAdmin
PermAll = 0x1f
)
var (
emptyPassword = []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
opNames = map[int32]string{
opNotify: "notify",
opCreate: "create",
opDelete: "delete",
opExists: "exists",
opGetData: "getData",
opSetData: "setData",
opGetAcl: "getACL",
opSetAcl: "setACL",
opGetChildren: "getChildren",
opSync: "sync",
opPing: "ping",
opGetChildren2: "getChildren2",
opCheck: "check",
opMulti: "multi",
opClose: "close",
opSetAuth: "setAuth",
opSetWatches: "setWatches",
opWatcherEvent: "watcherEvent",
}
)
type EventType int32
func (t EventType) String() string {
if name := eventNames[t]; name != "" {
return name
}
return "Unknown"
}
// Mode is used to build custom server modes (leader|follower|standalone).
type Mode uint8
func (m Mode) String() string {
if name := modeNames[m]; name != "" {
return name
}
return "unknown"
}
const (
ModeUnknown Mode = iota
ModeLeader Mode = iota
ModeFollower Mode = iota
ModeStandalone Mode = iota
)
var (
modeNames = map[Mode]string{
ModeLeader: "leader",
ModeFollower: "follower",
ModeStandalone: "standalone",
}
)