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client.go
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client.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package gxzookeeper
import (
"path"
"strings"
"sync"
"sync/atomic"
"time"
)
import (
"github.com/dubbogo/go-zookeeper/zk"
perrors "github.com/pkg/errors"
)
const (
SLASH = "/"
)
var (
zkClientPool zookeeperClientPool
clientPoolOnce sync.Once
// ErrNilZkClientConn no conn error
ErrNilZkClientConn = perrors.New("Zookeeper Client{conn} is nil")
ErrStatIsNil = perrors.New("Stat of the node is nil")
)
// ZookeeperClient represents zookeeper Client Configuration
type ZookeeperClient struct {
name string
ZkAddrs []string
sync.RWMutex // for conn
Conn *zk.Conn
activeNumber uint32
Timeout time.Duration
Wait sync.WaitGroup
valid uint32
share bool
initialized uint32
reconnectCh chan struct{}
eventRegistry map[string][]chan zk.Event
eventRegistryLock sync.RWMutex
zkEventHandler ZkEventHandler
Session <-chan zk.Event
}
type zookeeperClientPool struct {
sync.Mutex
zkClient map[string]*ZookeeperClient
}
// ZkEventHandler interface
type ZkEventHandler interface {
HandleZkEvent(z *ZookeeperClient)
}
// DefaultHandler is default handler for zk event
type DefaultHandler struct{}
// StateToString will transfer zk state to string
func StateToString(state zk.State) string {
switch state {
case zk.StateDisconnected:
return "zookeeper disconnected"
case zk.StateConnecting:
return "zookeeper connecting"
case zk.StateAuthFailed:
return "zookeeper auth failed"
case zk.StateConnectedReadOnly:
return "zookeeper connect readonly"
case zk.StateSaslAuthenticated:
return "zookeeper sasl authenticated"
case zk.StateExpired:
return "zookeeper connection expired"
case zk.StateConnected:
return "zookeeper connected"
case zk.StateHasSession:
return "zookeeper has Session"
case zk.StateUnknown:
return "zookeeper unknown state"
default:
return state.String()
}
}
func initZookeeperClientPool() {
zkClientPool.zkClient = make(map[string]*ZookeeperClient)
}
// NewZookeeperClient will create a ZookeeperClient
func NewZookeeperClient(name string, zkAddrs []string, share bool, opts ...zkClientOption) (*ZookeeperClient, error) {
if !share {
return newClient(name, zkAddrs, share, opts...)
}
clientPoolOnce.Do(initZookeeperClientPool)
zkClientPool.Lock()
defer zkClientPool.Unlock()
if zkClient, ok := zkClientPool.zkClient[name]; ok {
zkClient.activeNumber++
return zkClient, nil
}
newZkClient, err := newClient(name, zkAddrs, share, opts...)
if err != nil {
return nil, err
}
zkClientPool.zkClient[name] = newZkClient
return newZkClient, nil
}
func newClient(name string, zkAddrs []string, share bool, opts ...zkClientOption) (*ZookeeperClient, error) {
newZkClient := &ZookeeperClient{
name: name,
ZkAddrs: zkAddrs,
activeNumber: 0,
share: share,
reconnectCh: make(chan struct{}),
eventRegistry: make(map[string][]chan zk.Event),
Session: make(<-chan zk.Event),
zkEventHandler: &DefaultHandler{},
}
for _, opt := range opts {
opt(newZkClient)
}
err := newZkClient.createZookeeperConn()
if err != nil {
return nil, err
}
newZkClient.activeNumber++
return newZkClient, nil
}
// nolint
func (z *ZookeeperClient) createZookeeperConn() error {
var err error
// connect to zookeeper
z.Conn, z.Session, err = zk.Connect(z.ZkAddrs, z.Timeout)
if err != nil {
return err
}
atomic.StoreUint32(&z.valid, 1)
go z.zkEventHandler.HandleZkEvent(z)
return nil
}
// WithTestCluster sets test cluster for zk Client
func WithTestCluster(ts *zk.TestCluster) Option {
return func(opt *options) {
opt.Ts = ts
}
}
// NewMockZookeeperClient returns a mock Client instance
func NewMockZookeeperClient(name string, timeout time.Duration, opts ...Option) (*zk.TestCluster, *ZookeeperClient, <-chan zk.Event, error) {
var (
err error
z *ZookeeperClient
ts *zk.TestCluster
)
z = &ZookeeperClient{
name: name,
ZkAddrs: []string{},
Timeout: timeout,
share: false,
reconnectCh: make(chan struct{}),
eventRegistry: make(map[string][]chan zk.Event),
Session: make(<-chan zk.Event),
zkEventHandler: &DefaultHandler{},
}
option := &options{}
for _, opt := range opts {
opt(option)
}
// connect to zookeeper
if option.Ts != nil {
ts = option.Ts
} else {
ts, err = zk.StartTestCluster(1, nil, nil, zk.WithRetryTimes(40))
if err != nil {
return nil, nil, nil, perrors.WithMessagef(err, "zk.StartTestCluster fail")
}
}
z.Conn, z.Session, err = ts.ConnectWithOptions(timeout)
if err != nil {
return nil, nil, nil, perrors.WithMessagef(err, "zk.Connect fail")
}
atomic.StoreUint32(&z.valid, 1)
z.activeNumber++
return ts, z, z.Session, nil
}
// HandleZkEvent handles zookeeper events
func (d *DefaultHandler) HandleZkEvent(z *ZookeeperClient) {
var (
state int
event zk.Event
)
for {
select {
case event = <-z.Session:
switch event.State {
case zk.StateDisconnected:
atomic.StoreUint32(&z.valid, 0)
case zk.StateConnected:
z.eventRegistryLock.RLock()
for path, a := range z.eventRegistry {
if strings.HasPrefix(event.Path, path) {
for _, e := range a {
e <- event
}
}
}
z.eventRegistryLock.RUnlock()
case zk.StateConnecting, zk.StateHasSession:
if state == (int)(zk.StateHasSession) {
continue
}
if event.State == zk.StateHasSession {
atomic.StoreUint32(&z.valid, 1)
//if this is the first connection, don't trigger reconnect event
if !atomic.CompareAndSwapUint32(&z.initialized, 0, 1) {
close(z.reconnectCh)
z.reconnectCh = make(chan struct{})
}
}
z.eventRegistryLock.RLock()
if a, ok := z.eventRegistry[event.Path]; ok && 0 < len(a) {
for _, e := range a {
e <- event
}
}
z.eventRegistryLock.RUnlock()
}
state = (int)(event.State)
}
}
}
// RegisterEvent registers zookeeper events
func (z *ZookeeperClient) RegisterEvent(zkPath string, event chan zk.Event) {
if zkPath == "" {
return
}
z.eventRegistryLock.Lock()
defer z.eventRegistryLock.Unlock()
a := z.eventRegistry[zkPath]
a = append(a, event)
z.eventRegistry[zkPath] = a
}
// UnregisterEvent unregisters zookeeper events
func (z *ZookeeperClient) UnregisterEvent(zkPath string, event chan zk.Event) {
if zkPath == "" {
return
}
z.eventRegistryLock.Lock()
defer z.eventRegistryLock.Unlock()
infoList, ok := z.eventRegistry[zkPath]
if !ok {
return
}
for i, e := range infoList {
if e == event {
infoList = append(infoList[:i], infoList[i+1:]...)
}
}
if len(infoList) == 0 {
delete(z.eventRegistry, zkPath)
} else {
z.eventRegistry[zkPath] = infoList
}
}
// ZkConnValid validates zookeeper connection
func (z *ZookeeperClient) ZkConnValid() bool {
if atomic.LoadUint32(&z.valid) == 1 {
return true
}
return false
}
// Create will create the node recursively, which means that if the parent node is absent,
// it will create parent node first.
// And the value for the basePath is ""
func (z *ZookeeperClient) Create(basePath string) error {
return z.CreateWithValue(basePath, []byte{})
}
// CreateWithValue will create the node recursively, which means that if the parent node is absent,
// it will create parent node first.
// basePath should start with "/"
func (z *ZookeeperClient) CreateWithValue(basePath string, value []byte) error {
conn := z.getConn()
if conn == nil {
return ErrNilZkClientConn
}
if !strings.HasPrefix(basePath, SLASH) {
basePath = SLASH + basePath
}
paths := strings.Split(basePath, SLASH)
// Check the ancestor's path
for idx := 2; idx < len(paths); idx++ {
tmpPath := strings.Join(paths[:idx], SLASH)
_, err := conn.Create(tmpPath, []byte{}, 0, zk.WorldACL(zk.PermAll))
if err != nil && err != zk.ErrNodeExists {
return perrors.WithMessagef(err, "Error while invoking zk.Create(path:%s), the reason maybe is: ", tmpPath)
}
}
_, err := conn.Create(basePath, value, 0, zk.WorldACL(zk.PermAll))
if err != nil {
return err
}
return nil
}
// CreateTempWithValue will create the node recursively, which means that if the parent node is absent,
// it will create parent node first,and set value in last child path
// If the path exist, it will update data
func (z *ZookeeperClient) CreateTempWithValue(basePath string, value []byte) error {
var (
err error
tmpPath string
)
conn := z.getConn()
if conn == nil {
return ErrNilZkClientConn
}
if !strings.HasPrefix(basePath, SLASH) {
basePath = SLASH + basePath
}
pathSlice := strings.Split(basePath, SLASH)[1:]
length := len(pathSlice)
for i, str := range pathSlice {
tmpPath = path.Join(tmpPath, SLASH, str)
// last child need be ephemeral
if i == length-1 {
_, err = conn.Create(tmpPath, value, zk.FlagEphemeral, zk.WorldACL(zk.PermAll))
if err != nil {
return perrors.WithMessagef(err, "Error while invoking zk.Create(path:%s), the reason maybe is: ", tmpPath)
}
break
}
// we need ignore node exists error for those parent node
_, err = conn.Create(tmpPath, []byte{}, 0, zk.WorldACL(zk.PermAll))
if err != nil && err != zk.ErrNodeExists {
return perrors.WithMessagef(err, "Error while invoking zk.Create(path:%s), the reason maybe is: ", tmpPath)
}
}
return nil
}
// Delete will delete basePath
func (z *ZookeeperClient) Delete(basePath string) error {
conn := z.getConn()
if conn == nil {
return ErrNilZkClientConn
}
return perrors.WithMessagef(conn.Delete(basePath, -1), "Delete(basePath:%s)", basePath)
}
// RegisterTemp registers temporary node by @basePath and @node
func (z *ZookeeperClient) RegisterTemp(basePath string, node string) (string, error) {
zkPath := path.Join(basePath) + SLASH + node
conn := z.getConn()
if conn == nil {
return "", ErrNilZkClientConn
}
tmpPath, err := conn.Create(zkPath, []byte(""), zk.FlagEphemeral, zk.WorldACL(zk.PermAll))
if err != nil {
return zkPath, perrors.WithStack(err)
}
return tmpPath, nil
}
// RegisterTempSeq register temporary sequence node by @basePath and @data
func (z *ZookeeperClient) RegisterTempSeq(basePath string, data []byte) (string, error) {
var (
err error
tmpPath string
)
err = ErrNilZkClientConn
conn := z.getConn()
if conn != nil {
tmpPath, err = conn.Create(
path.Join(basePath)+SLASH,
data,
zk.FlagEphemeral|zk.FlagSequence,
zk.WorldACL(zk.PermAll),
)
}
if err != nil && err != zk.ErrNodeExists {
return "", perrors.WithStack(err)
}
return tmpPath, nil
}
// GetChildrenW gets children watch by @path
func (z *ZookeeperClient) GetChildrenW(path string) ([]string, <-chan zk.Event, error) {
conn := z.getConn()
if conn == nil {
return nil, nil, ErrNilZkClientConn
}
children, stat, watcher, err := conn.ChildrenW(path)
if err != nil {
return nil, nil, perrors.WithMessagef(err, "Error while invoking zk.ChildrenW(path:%s), the reason maybe is: ", path)
}
if stat == nil {
return nil, nil, perrors.WithMessagef(ErrStatIsNil, "Error while invokeing zk.ChildrenW(path:%s), the reason is: ", path)
}
return children, watcher.EvtCh, nil
}
// GetChildren gets children by @path
func (z *ZookeeperClient) GetChildren(path string) ([]string, error) {
conn := z.getConn()
if conn == nil {
return nil, ErrNilZkClientConn
}
children, stat, err := conn.Children(path)
if err != nil {
return nil, perrors.WithMessagef(err, "Error while invoking zk.Children(path:%s), the reason maybe is: ", path)
}
if stat == nil {
return nil, perrors.Errorf("Error while invokeing zk.Children(path:%s), the reason is that the stat is nil", path)
}
return children, nil
}
// ExistW to judge watch whether it exists or not by @zkPath
func (z *ZookeeperClient) ExistW(zkPath string) (<-chan zk.Event, error) {
conn := z.getConn()
if conn == nil {
return nil, ErrNilZkClientConn
}
_, _, watcher, err := conn.ExistsW(zkPath)
if err != nil {
return nil, perrors.WithMessagef(err, "zk.ExistsW(path:%s)", zkPath)
}
return watcher.EvtCh, nil
}
// GetContent gets content by @zkPath
func (z *ZookeeperClient) GetContent(zkPath string) ([]byte, *zk.Stat, error) {
return z.Conn.Get(zkPath)
}
// SetContent set content of zkPath
func (z *ZookeeperClient) SetContent(zkPath string, content []byte, version int32) (*zk.Stat, error) {
return z.Conn.Set(zkPath, content, version)
}
// getConn gets zookeeper connection safely
func (z *ZookeeperClient) getConn() *zk.Conn {
if z == nil {
return nil
}
z.RLock()
defer z.RUnlock()
return z.Conn
}
// Reconnect gets zookeeper reconnect event
func (z *ZookeeperClient) Reconnect() <-chan struct{} {
return z.reconnectCh
}
// GetEventHandler gets zookeeper event handler
func (z *ZookeeperClient) GetEventHandler() ZkEventHandler {
return z.zkEventHandler
}
func (z *ZookeeperClient) Close() {
if z.share {
zkClientPool.Lock()
defer zkClientPool.Unlock()
z.activeNumber--
if z.activeNumber == 0 {
z.Conn.Close()
delete(zkClientPool.zkClient, z.name)
}
} else {
z.Lock()
conn := z.Conn
z.activeNumber--
z.Conn = nil
z.Unlock()
if conn != nil {
conn.Close()
}
}
}