File lib/session_memcached.php

1:	<?php
2:
3:	/**
4:	* Session handling
5:	* @package framework
6:	* @subpackage session
7:	*/
8:
9:	/**
10:	* This session class uses a memcached to manage session data. It does not
11:	* use PHP session handlers at all and is a completely indenpendant session system.
12:	*/
13:	class Hm_Memcached_Session extends Hm_DB_Session {
14:
15:	/* session key */
16:	public $session_key = '';
17:
18:	/* memcached connection */
19:	public $conn;
20:
21:	/* default session lifetime */
22:	public $cache_lifetime = 86400;
23:
24:	/**
25:	* Start the session. This could be an existing session or a new login
26:	* @param object $request request details
27:	* @return void
28:	*/
29:	public function start($request, $existing_session = false) {
30:	$this->db_start($request);
31:	}
32:
33:	/**
34:	* save data on session start
35:	* @return boolean\|integer\|array
36:	*/
37:	public function insert_session_row() {
38:	return $this->save_data();
39:	}
40:
41:	/**
42:	* update memcache with current data
43:	* @return boolean\|integer\|array
44:	*/
45:	public function save_data() {
46:	$enc_data = $this->ciphertext($this->data);
47:	return $this->conn->set($this->session_key, $enc_data, $this->cache_lifetime);
48:	}
49:
50:	/**
51:	* End a session after a page request is complete. This only closes the session and
52:	* does not destroy it
53:	* @return void
54:	*/
55:	public function end() {
56:	if ($this->active && !$this->session_closed) {
57:	$this->save_data();
58:	$this->conn->close();
59:	}
60:	$this->active = false;
61:	}
62:
63:	/**
64:	* Close a session early, but don't destroy it
65:	* @return void
66:	*/
67:	public function close_early() {
68:	$this->session_closed = true;
69:	$this->save_data();
70:	$this->conn->close();
71:	}
72:
73:	/**
74:	* Destroy a session for good
75:	* @param object $request request details
76:	* @return void
77:	*/
78:	public function destroy($request) {
79:	if (Hm_Functions::function_exists('delete_uploaded_files')) {
80:	delete_uploaded_files($this);
81:	}
82:	$this->conn->del($this->session_key);
83:	$this->delete_cookie($request, $this->cname);
84:	$this->delete_cookie($request, 'hm_id');
85:	$this->session_closed = true;
86:	$this->conn->close();
87:	$this->active = false;
88:	Hm_Request_Key::load($this, $request, false);
89:	}
90:
91:	/**
92:	* @return boolean
93:	*/
94:	public function connect() {
95:	$this->conn = new Hm_Memcached($this->site_config);
96:	return $this->conn->is_active();
97:	}
98:
99:	/**
100:	* Get session data from the DB
101:	* @param string $key session key
102:	* @return mixed array results or false on failure
103:	*/
104:	public function get_session_data($key) {
105:	return $this->plaintext($this->conn->get($key));
106:	}
107:	}
108:

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