Class yii\mongodb\Session

All Classes | Properties | Methods

Inheritance	yii\mongodb\Session » yii\web\MultiFieldSession
Available since extension's version	2.0
Source Code	https://github.com/yiisoft/yii2-mongodb/blob/master/Session.php

Session extends \yii\web\Session by using MongoDB as session data storage.

By default, Session stores session data in a collection named 'session' inside the default database. This collection is better to be pre-created with fields 'id' and 'expire' indexed. The collection name can be changed by setting $sessionCollection.

The following example shows how you can configure the application to use Session: Add the following to your application config under components:

'session' => [
    'class' => 'yii\mongodb\Session',
    // 'db' => 'mymongodb',
    // 'sessionCollection' => 'my_session',
]

Session extends MultiFieldSession, thus it allows saving extra fields into the $sessionCollection. Refer to MultiFieldSession for more details.

Tip: you can use MongoDB TTL index for the session garbage collection for performance saving, in this case you should set Session::gCProbability to 0.

Public Properties

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Property	Type	Description	Defined By
$db	yii\mongodb\Connection\|array\|string	The MongoDB connection object or the application component ID of the MongoDB connection.	yii\mongodb\Session
$sessionCollection	string\|array	The name of the MongoDB collection that stores the session data.	yii\mongodb\Session
$useCustomStorage	boolean	Whether to use custom storage.	yii\mongodb\Session

Public Methods

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Method	Description	Defined By
destroySession()	Session destroy handler.	yii\mongodb\Session
gcSession()	Session GC (garbage collection) handler.	yii\mongodb\Session
init()	Initializes the Session component.	yii\mongodb\Session
readSession()	Session read handler.	yii\mongodb\Session
regenerateID()	Updates the current session ID with a newly generated one.	yii\mongodb\Session
writeSession()	Session write handler.	yii\mongodb\Session

Property Details

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$db public property

The MongoDB connection object or the application component ID of the MongoDB connection. After the Session object is created, if you want to change this property, you should only assign it with a MongoDB connection object. Starting from version 2.0.2, this can also be a configuration array for creating the object.

public yii\mongodb\Connection|array|string $db = 'mongodb'

$sessionCollection public property

The name of the MongoDB collection that stores the session data. Please refer to yii\mongodb\Connection::getCollection() on how to specify this parameter. This collection is better to be pre-created with fields 'id' and 'expire' indexed.

public string|array $sessionCollection = 'session'

$useCustomStorage public property

Whether to use custom storage. This property is read-only.

public boolean $useCustomStorage = null

Method Details

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destroySession() public method

Session destroy handler.

Do not call this method directly.

public boolean destroySession ( $id )
$id	string	Session ID
return	boolean	Whether session is destroyed successfully

Source code

                public function destroySession($id)
{
    $this->db->getCollection($this->sessionCollection)->remove(
        ['id' => $id],
        ['justOne' => true]
    );
    return true;
}

gcSession() public method

Session GC (garbage collection) handler.

Do not call this method directly.

public boolean gcSession ( $maxLifetime )
$maxLifetime	integer	The number of seconds after which data will be seen as 'garbage' and cleaned up.
return	boolean	Whether session is GCed successfully

Source code

                public function gcSession($maxLifetime)
{
    $this->db->getCollection($this->sessionCollection)
        ->remove(['expire' => ['$lt' => time()]]);
    return true;
}

init() public method

Initializes the Session component.

This method will initialize the $db property to make sure it refers to a valid MongoDB connection.

public void init ( )
throws	\yii\base\InvalidConfigException	if $db is invalid.

Source code

                public function init()
{
    parent::init();
    $this->db = Instance::ensure($this->db, Connection::className());
}

readSession() public method

Session read handler.

Do not call this method directly.

public string readSession ( $id )
$id	string	Session ID
return	string	The session data

Source code

                public function readSession($id)
{
    $collection = $this->db->getCollection($this->sessionCollection);
    $condition = [
        'id' => $id,
        'expire' => ['$gt' => time()],
    ];
    if (isset($this->readCallback)) {
        $doc = $collection->findOne($condition);
        return $doc === null ? '' : $this->extractData($doc);
    }
    $doc = $collection->findOne(
        $condition,
        ['data' => 1, '_id' => 0]
    );
    return isset($doc['data']) ? $doc['data'] : '';
}

regenerateID() public method

Updates the current session ID with a newly generated one.

Please refer to http://php.net/session_regenerate_id for more details.

public void regenerateID ( $deleteOldSession = false )
$deleteOldSession	boolean	Whether to delete the old associated session file or not.

Source code

                public function regenerateID($deleteOldSession = false)
{
    $oldID = session_id();
    // if no session is started, there is nothing to regenerate
    if (empty($oldID)) {
        return;
    }
    parent::regenerateID(false);
    $newID = session_id();
    $collection = $this->db->getCollection($this->sessionCollection);
    $row = $collection->findOne(['id' => $oldID]);
    if ($row !== null) {
        if ($deleteOldSession) {
            $collection->update(['id' => $oldID], ['id' => $newID]);
        } else {
            unset($row['_id']);
            $row['id'] = $newID;
            $collection->insert($row);
        }
    } else {
        // shouldn't reach here normally
        $collection->insert($this->composeFields($newID, ''));
    }
}

writeSession() public method

Session write handler.

Do not call this method directly.

public boolean writeSession ( $id, $data )
$id	string	Session ID
$data	string	Session data
return	boolean	Whether session write is successful

Source code

                public function writeSession($id, $data)
{
    // exception must be caught in session write handler
    // http://us.php.net/manual/en/function.session-set-save-handler.php
    try {
        $this->db->getCollection($this->sessionCollection)->update(
            ['id' => $id],
            $this->composeFields($id, $data),
            ['upsert' => true]
        );
    } catch (\Exception $e) {
        $exception = ErrorHandler::convertExceptionToString($e);
        // its too late to use Yii logging here
        error_log($exception);
        echo $exception;
        return false;
    }
    return true;
}