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client.go
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client.go
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package zookeeper
import (
"path/filepath"
"strings"
"time"
"github.com/kelseyhightower/confd/log"
zk "github.com/samuel/go-zookeeper/zk"
)
// Client provides a wrapper around the zookeeper client
type Client struct {
client *zk.Conn
}
func NewZookeeperClient(machines []string) (*Client, error) {
c, _, err := zk.Connect(machines, time.Second) //*10)
if err != nil {
panic(err)
}
return &Client{c}, nil
}
func nodeWalk(prefix string, c *Client, vars map[string]string) error {
var s string
l, stat, err := c.client.Children(prefix)
if err != nil {
return err
}
if stat.NumChildren == 0 {
b, _, err := c.client.Get(prefix)
if err != nil {
return err
}
vars[prefix] = string(b)
} else {
for _, key := range l {
if prefix == "/" {
s = "/" + key
} else {
s = prefix + "/" + key
}
_, stat, err := c.client.Exists(s)
if err != nil {
return err
}
if stat.NumChildren == 0 {
b, _, err := c.client.Get(s)
if err != nil {
return err
}
vars[s] = string(b)
} else {
nodeWalk(s, c, vars)
}
}
}
return nil
}
func (c *Client) GetValues(keys []string) (map[string]string, error) {
vars := make(map[string]string)
for _, v := range keys {
v = strings.Replace(v, "/*", "", -1)
_, _, err := c.client.Exists(v)
if err != nil {
return vars, err
}
err = nodeWalk(v, c, vars)
if err != nil {
return vars, err
}
}
return vars, nil
}
type watchResponse struct {
waitIndex uint64
err error
}
func (c *Client) watch(key string, respChan chan watchResponse, cancelRoutine chan bool) {
_, _, keyEventCh, err := c.client.GetW(key)
if err != nil {
respChan <- watchResponse{0, err}
}
_, _, childEventCh, err := c.client.ChildrenW(key)
if err != nil {
respChan <- watchResponse{0, err}
}
for {
select {
case e := <-keyEventCh:
if e.Type == zk.EventNodeDataChanged {
respChan <- watchResponse{1, e.Err}
}
case e := <-childEventCh:
if e.Type == zk.EventNodeChildrenChanged {
respChan <- watchResponse{1, e.Err}
}
case <-cancelRoutine:
log.Debug("Stop watching: " + key)
// There is no way to stop GetW/ChildrenW so just quit
return
}
}
}
func (c *Client) WatchPrefix(prefix string, keys []string, waitIndex uint64, stopChan chan bool) (uint64, error) {
// return something > 0 to trigger a key retrieval from the store
if waitIndex == 0 {
return 1, nil
}
// List the childrens first
entries, err := c.GetValues([]string{prefix})
if err != nil {
return 0, err
}
respChan := make(chan watchResponse)
cancelRoutine := make(chan bool)
defer close(cancelRoutine)
//watch all subfolders for changes
watchMap := make(map[string]string)
for k, _ := range entries {
for _, v := range keys {
if strings.HasPrefix(k, v) {
for dir := filepath.Dir(k); dir != "/"; dir = filepath.Dir(dir) {
if _, ok := watchMap[dir]; !ok {
watchMap[dir] = ""
log.Debug("Watching: " + dir)
go c.watch(dir, respChan, cancelRoutine)
}
}
break
}
}
}
//watch all keys in prefix for changes
for k, _ := range entries {
for _, v := range keys {
if strings.HasPrefix(k, v) {
log.Debug("Watching: " + k)
go c.watch(k, respChan, cancelRoutine)
break
}
}
}
for {
select {
case <-stopChan:
return waitIndex, nil
case r := <-respChan:
return r.waitIndex, r.err
}
}
}