php的zookeeper擴展安裝及使用

 

ZooKeeper是一個分布式的，開放源碼的分布式應用程序協調服務，是Google的Chubby一個開源的實現，是Hadoop和Hbase的重要組件。它是一個為分布式應用提供一致性服務的軟件，提供的功能包括：配置維護、域名服務、分布式同步、組服務等。

ZooKeeper的目標就是封裝好復雜易出錯的關鍵服務，將簡單易用的接口和性能高效、功能穩定的系統提供給用戶。

要在php中使用zookeeper，先要安裝php zookeeper擴展，要安裝php zookeeper擴展，得先安裝zookeeper

1、安裝zookeeper

在這里面下載最新版的穩定版

http://mirror.bit.edu.cn/apache/zookeeper/stable/

cd /download

wget http://mirror.bit.edu.cn/apache/zookeeper/stable/zookeeper-3.4.12.tar.gz //這個是已經安裝好的工具，下面我們還需要自己編譯安裝一下，因為后面安裝php的擴展時用得到

tar -zxvf zookeeper-3.4.12.tar.gz

cd zookeeper-3.4.12/src/c/

./configure --prefix=/usr/local/zookeeper  //指定一下安裝目錄

make && make install

就這樣安裝完了

2、安裝php zookeeper的擴展  在 http://pecl.php.net/package/zookeeper中找

cd /download

wget http://pecl.php.net/get/zookeeper-0.6.2.tgz

tar -zxvf zookeeper-0.6.2.tgz

 cd zookeeper-0.6.2

./configure --with-libzookeeper-dir=/usr/local/zookeeper //要指定依賴

make && make install

配置php.ini

extension="/usr/local/Cellar/php/7.2.6/pecl/20170718/zookeeper.so"

重啟php-fpm即可

3、啟動zookeeper前要安裝jdk  已經安裝的可以忽略

在http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html里面下載

然后傻瓜式安裝，這里不說了

4、啟動zookeeper

cd /download/zookeeper-3.4.12/bin

 ./zkServer.sh start

./zkCli.sh -server 127.0.0.1:2181

cli方式開啟

注意：

如果報錯：

cd ../conf

cp zoo_sample.cfg zoo.cfg

復制一下文件

5、php代碼測試

測試代碼1、

1.  
   <?php
2.  
   /**
3.  
   *
4.  
   */
5.  
   class zookeeperDemo
6.  
   {
7.  
   private $zookeeper;
8.  
   function __construct($address)
9.  
   {
10.  
    $this->zookeeper = new Zookeeper($address);
11.  
    }
12.  
    /*
13.  
    * get
14.  
    */
15.  
    public function get($path)
16.  
    {
17.  
    if (!$this->zookeeper->exists($path)) {
18.  
    return null;
19.  
    }
20.  
    return $this->zookeeper->get($path);
21.  
    }
22.  
     
23.  
    public function getChildren($path) {
24.  
    if (strlen($path) > 1 && preg_match('@/$@', $path)) {
25.  
    // remove trailing /
26.  
    $path = substr($path, 0, -1);
27.  
    }
28.  
    return $this->zookeeper->getChildren($path);
29.  
    }
30.  
    /*
31.  
    * set 值
32.  
    *
33.  
    *
34.  
    */
35.  
    public function set($path, $value)
36.  
    {
37.  
    if (!$this->zookeeper->exists($path)) {
38.  
    //創建節點
39.  
    $this->makePath($path);
40.  
    } else {
41.  
    $this->zookeeper->set($path,$value);
42.  
    }
43.  
     
44.  
    }
45.  
    /*
46.  
    * 創建路徑
47.  
    */
48.  
    private function makePath($path, $value='')
49.  
    {
50.  
    $parts = explode( '/', $path);
51.  
    $parts = array_filter($parts); //過濾空值
52.  
    $subPath = '';
53.  
    while (count($parts) > 1) {
54.  
    $subPath .= '/' . array_shift($parts);//數組第一個元素彈出數組
55.  
    if (!$this->zookeeper->exists($subpath)) {
56.  
    $this->makeNode($subPath, $value);
57.  
    }
58.  
    }
59.  
    }
60.  
    /*
61.  
    * 創建節點
62.  
    *
63.  
    */
64.  
    private function makeNode($path, $value, array $params = array())
65.  
    {
66.  
    if (empty($params)) {
67.  
    $params = [
68.  
    [
69.  
    'perms' => Zookeeper::PERM_ALL,
70.  
    'scheme' => 'world',
71.  
    'id' => 'anyone'
72.  
    ]
73.  
    ];
74.  
    }
75.  
    return $this->zookeeper->create($path, $value, $params);
76.  
    }
77.  
    /*
78.  
    * 刪除
79.  
    **/
80.  
    public function deleteNode($path)
81.  
    {
82.  
    if (!$this->zookeeper->exists($path)) {
83.  
    return null;
84.  
    } else {
85.  
    return $this->zookeeper->delete($path);
86.  
    }
87.  
    }
88.  
     
89.  
    }
90.  
    $zk = new zookeeperDemo('localhost:2181');
91.  
    //var_dump($zk->get('/zookeeper'));
92.  
    var_dump($zk->getChildren( '/foo'));
93.  
    //var_dump($zk->deleteNode("/foo"));
94.  
     
95.  
    ?>

測試代碼2、

1.  
   <?php
2.  
   /**
3.  
   * PHP Zookeeper
4.  
   *
5.  
   * PHP Version 5.3
6.  
   *
7.  
   * The PHP License, version 3.01
8.  
   *
9.  
   * @category Libraries
10.  
    * @package PHP-Zookeeper
11.  
    * @author Lorenzo Alberton <[e-mail]>
12.  
    * @copyright 2012 PHP Group
13.  
    * @license http://www.php.net/license The PHP License, version 3.01
14.  
    * @link https://github.com/andreiz/php-zookeeper
15.  
    */
16.  
    /**
17.  
    * Example interaction with the PHP Zookeeper extension
18.  
    *
19.  
    * @category Libraries
20.  
    * @package PHP-Zookeeper
21.  
    * @author Lorenzo Alberton <[e-mail]>
22.  
    * @copyright 2012 PHP Group
23.  
    * @license http://www.php.net/license The PHP License, version 3.01
24.  
    * @link https://github.com/andreiz/php-zookeeper
25.  
    */
26.  
    class Zookeeper_Example
27.  
    {
28.  
    /**
29.  
    * @var Zookeeper
30.  
    */
31.  
    private $zookeeper;
32.  
    /**
33.  
    * @var Callback container
34.  
    */
35.  
    private $callback = array();
36.  
    /**
37.  
    * Constructor
38.  
    *
39.  
    * @param string $address CSV list of host:port values (e.g. "host1:2181,host2:2181")
40.  
    */
41.  
    public function __construct($address) {
42.  
    $this->zookeeper = new Zookeeper($address);
43.  
    }
44.  
    /**
45.  
    * Set a node to a value. If the node doesn't exist yet, it is created.
46.  
    * Existing values of the node are overwritten
47.  
    *
48.  
    * @param string $path The path to the node
49.  
    * @param mixed $value The new value for the node
50.  
    *
51.  
    * @return mixed previous value if set, or null
52.  
    */
53.  
    public function set($path, $value) {
54.  
    if (!$this->zookeeper->exists($path)) {
55.  
    $this->makePath($path);
56.  
    $this->makeNode($path, $value);
57.  
    } else {
58.  
    $this->zookeeper->set($path, $value);
59.  
    }
60.  
    }
61.  
    /**
62.  
    * Equivalent of "mkdir -p" on ZooKeeper
63.  
    *
64.  
    * @param string $path The path to the node
65.  
    * @param string $value The value to assign to each new node along the path
66.  
    *
67.  
    * @return bool
68.  
    */
69.  
    public function makePath($path, $value = '') {
70.  
    $parts = explode( '/', $path);
71.  
    $parts = array_filter($parts);
72.  
    $subpath = '';
73.  
    while (count($parts) > 1) {
74.  
    $subpath .= '/' . array_shift($parts);
75.  
    if (!$this->zookeeper->exists($subpath)) {
76.  
    $this->makeNode($subpath, $value);
77.  
    }
78.  
    }
79.  
    }
80.  
    /**
81.  
    * Create a node on ZooKeeper at the given path
82.  
    *
83.  
    * @param string $path The path to the node
84.  
    * @param string $value The value to assign to the new node
85.  
    * @param array $params Optional parameters for the Zookeeper node.
86.  
    * By default, a public node is created
87.  
    *
88.  
    * @return string the path to the newly created node or null on failure
89.  
    */
90.  
    public function makeNode($path, $value, array $params = array()) {
91.  
    if (empty($params)) {
92.  
    $params = array(
93.  
    array(
94.  
    'perms' => Zookeeper::PERM_ALL,
95.  
    'scheme' => 'world',
96.  
    'id' => 'anyone',
97.  
    )
98.  
    );
99.  
    }
100.  
     return $this->zookeeper->create($path, $value, $params);
101.  
     }
102.  
     /**
103.  
     * Get the value for the node
104.  
     *
105.  
     * @param string $path the path to the node
106.  
     *
107.  
     * @return string|null
108.  
     */
109.  
     public function get($path) {
110.  
     if (!$this->zookeeper->exists($path)) {
111.  
     return null;
112.  
     }
113.  
     return $this->zookeeper->get($path);
114.  
     }
115.  
     /**
116.  
     * List the children of the given path, i.e. the name of the directories
117.  
     * within the current node, if any
118.  
     *
119.  
     * @param string $path the path to the node
120.  
     *
121.  
     * @return array the subpaths within the given node
122.  
     */
123.  
     public function getChildren($path) {
124.  
     if (strlen($path) > 1 && preg_match('@/$@', $path)) {
125.  
     // remove trailing /
126.  
     $path = substr($path, 0, -1);
127.  
     }
128.  
     return $this->zookeeper->getChildren($path);
129.  
     }
130.  
      
131.  
     /**
132.  
     * Delete the node if it does not have any children
133.  
     *
134.  
     * @param string $path the path to the node
135.  
     *
136.  
     * @return true if node is deleted else null
137.  
     */
138.  
      
139.  
     public function deleteNode($path)
140.  
     {
141.  
     if(!$this->zookeeper->exists($path))
142.  
     {
143.  
     return null;
144.  
     }
145.  
     else
146.  
     {
147.  
     return $this->zookeeper->delete($path);
148.  
     }
149.  
     }
150.  
      
151.  
     /**
152.  
     * Wath a given path
153.  
     * @param string $path the path to node
154.  
     * @param callable $callback callback function
155.  
     * @return string|null
156.  
     */
157.  
     public function watch($path, $callback)
158.  
     {
159.  
     if (!is_callable($callback)) {
160.  
     return null;
161.  
     }
162.  
      
163.  
     if ($this->zookeeper->exists($path)) {
164.  
     if (!isset($this->callback[$path])) {
165.  
     $this->callback[$path] = array();
166.  
     }
167.  
     if (!in_array($callback, $this->callback[$path])) {
168.  
     $this->callback[$path][] = $callback;
169.  
     return $this->zookeeper->get($path, array($this, 'watchCallback'));
170.  
     }
171.  
     }
172.  
     }
173.  
      
174.  
     /**
175.  
     * Wath event callback warper
176.  
     * @param int $event_type
177.  
     * @param int $stat
178.  
     * @param string $path
179.  
     * @return the return of the callback or null
180.  
     */
181.  
     public function watchCallback($event_type, $stat, $path)
182.  
     {
183.  
     if (!isset($this->callback[$path])) {
184.  
     return null;
185.  
     }
186.  
      
187.  
     foreach ($this->callback[$path] as $callback) {
188.  
     $this->zookeeper->get($path, array($this, 'watchCallback'));
189.  
     return call_user_func($callback);
190.  
     }
191.  
     }
192.  
      
193.  
     /**
194.  
     * Delete watch callback on a node, delete all callback when $callback is null
195.  
     * @param string $path
196.  
     * @param callable $callback
197.  
     * @return boolean|NULL
198.  
     */
199.  
     public function cancelWatch($path, $callback = null)
200.  
     {
201.  
     if (isset($this->callback[$path])) {
202.  
     if (empty($callback)) {
203.  
     unset($this->callback[$path]);
204.  
     $this->zookeeper->get($path); //reset the callback
205.  
     return true;
206.  
     } else {
207.  
     $key = array_search($callback, $this->callback[$path]);
208.  
     if ($key !== false) {
209.  
     unset($this->callback[$path][$key]);
210.  
     return true;
211.  
     } else {
212.  
     return null;
213.  
     }
214.  
     }
215.  
     } else {
216.  
     return null;
217.  
     }
218.  
     }
219.  
     }
220.  
     $zk = new Zookeeper_Example('localhost:2181');
221.  
     // var_dump($zk->get('/'));
222.  
     // var_dump($zk->getChildren('/'));
223.  
     // var_dump($zk->set('/test', 'abc'));
224.  
     // var_dump($zk->get('/test'));
225.  
     // var_dump($zk->getChildren('/'));
226.  
     // var_dump($zk->set('/foo/001', 'bar1'));
227.  
     // var_dump($zk->set('/foo/002', 'bar2'));
228.  
     // var_dump($zk->get('/'));
229.  
     // var_dump($zk->getChildren('/'));
230.  
     // var_dump($zk->getChildren('/foo'));
231.  
      
232.  
     //watch example 一旦/test節點的值被改變，就會調用一次callback
233.  
     function callback() {
234.  
     echo "in watch callback\n";
235.  
     }
236.  
     //$zk->set('/test', 1);
237.  
     $ret = $zk->watch( '/test', 'callback');
238.  
     //$zk->set('/test', 2);//在終端執行
239.  
     while (true) {
240.  
     sleep( 1);
241.  
     }
242.  
      
243.  
     /*
244.  
     class ZookeeperDemo extends Zookeeper {
245.  
      
246.  
     public function watcher( $i, $type, $key ) {
247.  
     echo "Insider Watcher\n";
248.  
      
249.  
     // Watcher gets consumed so we need to set a new one
250.  
      
251.  
     //ZooKeeper提供了可以綁定在znode的監視器。如果監視器發現znode發生變化，該service會立即通知所有相關的客戶端。這就是PH//P腳本如何知道變化的。Zookeeper::get方法的第二個參數是回調函數。當觸發事件時，監視器會被消費掉，所以我們需要在回調函
252.  
     //數中再次設置監視器。
253.  
      
254.  
     $this->get( '/test', array($this, 'watcher' ) );
255.  
      
256.  
     }
257.  
      
258.  
     }
259.  
      
260.  
     $zoo = new ZookeeperDemo('127.0.0.1:2181');
261.  
     $zoo->get( '/test', array($zoo, 'watcher' ) );
262.  
      
263.  
     while( true ) {
264.  
     echo '.';
265.  
     sleep(2);
266.  
     }
267.  
     */
268.  
     /*
269.  
      
270.  
     // $zc = new Zookeeper();
271.  
      
272.  
     // $zc->connect('127.0.0.1:2181');
273.  
      
274.  
     // var_dump($zc->get('/zookeeper'));
275.  
      
276.  
     // exit;
277.  
     */
278.  
      
279.  
     ?>

代碼參考鏈接：

https://github.com/php-zookeeper/php-zookeeper/blob/master/examples/Zookeeper_Example.php