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<?php
/**
* @file
* Logging classes for the database layer.
*/
/**
* Database query logger.
*
* We log queries in a separate object rather than in the connection object
* because we want to be able to see all queries sent to a given database, not
* database target. If we logged the queries in each connection object we
* would not be able to track what queries went to which target.
*
* Every connection has one and only one logging object on it for all targets
* and logging keys.
*/
class DatabaseLog {
/**
* Cache of logged queries. This will only be used if the query logger is enabled.
*
* The structure for the logging array is as follows:
*
* array(
* $logging_key = array(
* array(query => '', args => array(), caller => '', target => '', time => 0),
* array(query => '', args => array(), caller => '', target => '', time => 0),
* ),
* );
*
* @var array
*/
protected $queryLog = array();
/**
* The connection key for which this object is logging.
*
* @var string
*/
protected $connectionKey = 'default';
/**
* Constructor.
*
* @param $key
* The database connection key for which to enable logging.
*/
public function __construct($key = 'default') {
$this->connectionKey = $key;
}
/**
* Begin logging queries to the specified connection and logging key.
*
* If the specified logging key is already running this method does nothing.
*
* @param $logging_key
* The identification key for this log request. By specifying different
* logging keys we are able to start and stop multiple logging runs
* simultaneously without them colliding.
*/
public function start($logging_key) {
if (empty($this->queryLog[$logging_key])) {
$this->clear($logging_key);
}
}
/**
* Retrieve the query log for the specified logging key so far.
*
* @param $logging_key
* The logging key to fetch.
* @return
* An indexed array of all query records for this logging key.
*/
public function get($logging_key) {
return $this->queryLog[$logging_key];
}
/**
* Empty the query log for the specified logging key.
*
* This method does not stop logging, it simply clears the log. To stop
* logging, use the end() method.
*
* @param $logging_key
* The logging key to empty.
*/
public function clear($logging_key) {
$this->queryLog[$logging_key] = array();
}
/**
* Stop logging for the specified logging key.
*
* @param $logging_key
* The logging key to stop.
*/
public function end($logging_key) {
unset($this->queryLog[$logging_key]);
}
/**
* Log a query to all active logging keys.
*
* @param $statement
* The prepared statement object to log.
* @param $args
* The arguments passed to the statement object.
* @param $time
* The time in milliseconds the query took to execute.
*/
public function log(DatabaseStatementInterface $statement, $args, $time) {
foreach (array_keys($this->queryLog) as $key) {
$this->queryLog[$key][] = array(
'query' => $statement->getQueryString(),
'args' => $args,
'target' => $statement->dbh->getTarget(),
'caller' => $this->findCaller(),
'time' => $time,
);
}
}
/**
* Determine the routine that called this query.
*
* We define "the routine that called this query" as the first entry in
* the call stack that is not inside includes/database and does have a file
* (which excludes call_user_func_array(), anonymous functions and similar).
* That makes the climbing logic very simple, and handles the variable stack
* depth caused by the query builders.
*
* @link http://www.php.net/debug_backtrace
* @return
* This method returns a stack trace entry similar to that generated by
* debug_backtrace(). However, it flattens the trace entry and the trace
* entry before it so that we get the function and args of the function that
* called into the database system, not the function and args of the
* database call itself.
*/
public function findCaller() {
$stack = debug_backtrace();
$stack_count = count($stack);
for ($i = 0; $i < $stack_count; ++$i) {
if (!empty($stack[$i]['file']) && strpos($stack[$i]['file'], 'includes' . DIRECTORY_SEPARATOR . 'database') === FALSE) {
$stack[$i] += array('args' => array());
return array(
'file' => $stack[$i]['file'],
'line' => $stack[$i]['line'],
'function' => $stack[$i + 1]['function'],
'class' => isset($stack[$i + 1]['class']) ? $stack[$i + 1]['class'] : NULL,
'type' => isset($stack[$i + 1]['type']) ? $stack[$i + 1]['type'] : NULL,
'args' => $stack[$i + 1]['args'],
);
}
}
}
}
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