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<?php
/*
* This file is part of Mustache.php.
*
* (c) 2010-2017 Justin Hileman
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
/**
* A Mustache Stream Logger.
*
* The Stream Logger wraps a file resource instance (such as a stream) or a
* stream URL. All log messages over the threshold level will be appended to
* this stream.
*
* Hint: Try `php://stderr` for your stream URL.
*/
class Mustache_Logger_StreamLogger extends Mustache_Logger_AbstractLogger
{
protected static $levels = array(
self::DEBUG => 100,
self::INFO => 200,
self::NOTICE => 250,
self::WARNING => 300,
self::ERROR => 400,
self::CRITICAL => 500,
self::ALERT => 550,
self::EMERGENCY => 600,
);
protected $level;
protected $stream = null;
protected $url = null;
/**
* @throws InvalidArgumentException if the logging level is unknown
*
* @param resource|string $stream Resource instance or URL
* @param int $level The minimum logging level at which this handler will be triggered
*/
public function __construct($stream, $level = Mustache_Logger::ERROR)
{
$this->setLevel($level);
if (is_resource($stream)) {
$this->stream = $stream;
} else {
$this->url = $stream;
}
}
/**
* Close stream resources.
*/
public function __destruct()
{
if (is_resource($this->stream)) {
fclose($this->stream);
}
}
/**
* Set the minimum logging level.
*
* @throws Mustache_Exception_InvalidArgumentException if the logging level is unknown
*
* @param int $level The minimum logging level which will be written
*/
public function setLevel($level)
{
if (!array_key_exists($level, self::$levels)) {
throw new Mustache_Exception_InvalidArgumentException(sprintf('Unexpected logging level: %s', $level));
}
$this->level = $level;
}
/**
* Get the current minimum logging level.
*
* @return int
*/
public function getLevel()
{
return $this->level;
}
/**
* Logs with an arbitrary level.
*
* @throws Mustache_Exception_InvalidArgumentException if the logging level is unknown
*
* @param mixed $level
* @param string $message
* @param array $context
*/
public function log($level, $message, array $context = array())
{
if (!array_key_exists($level, self::$levels)) {
throw new Mustache_Exception_InvalidArgumentException(sprintf('Unexpected logging level: %s', $level));
}
if (self::$levels[$level] >= self::$levels[$this->level]) {
$this->writeLog($level, $message, $context);
}
}
/**
* Write a record to the log.
*
* @throws Mustache_Exception_LogicException If neither a stream resource nor url is present
* @throws Mustache_Exception_RuntimeException If the stream url cannot be opened
*
* @param int $level The logging level
* @param string $message The log message
* @param array $context The log context
*/
protected function writeLog($level, $message, array $context = array())
{
if (!is_resource($this->stream)) {
if (!isset($this->url)) {
throw new Mustache_Exception_LogicException('Missing stream url, the stream can not be opened. This may be caused by a premature call to close().');
}
$this->stream = fopen($this->url, 'a');
if (!is_resource($this->stream)) {
// @codeCoverageIgnoreStart
throw new Mustache_Exception_RuntimeException(sprintf('The stream or file "%s" could not be opened.', $this->url));
// @codeCoverageIgnoreEnd
}
}
fwrite($this->stream, self::formatLine($level, $message, $context));
}
/**
* Gets the name of the logging level.
*
* @throws InvalidArgumentException if the logging level is unknown
*
* @param int $level
*
* @return string
*/
protected static function getLevelName($level)
{
return strtoupper($level);
}
/**
* Format a log line for output.
*
* @param int $level The logging level
* @param string $message The log message
* @param array $context The log context
*
* @return string
*/
protected static function formatLine($level, $message, array $context = array())
{
return sprintf(
"%s: %s\n",
self::getLevelName($level),
self::interpolateMessage($message, $context)
);
}
/**
* Interpolate context values into the message placeholders.
*
* @param string $message
* @param array $context
*
* @return string
*/
protected static function interpolateMessage($message, array $context = array())
{
if (strpos($message, '{') === false) {
return $message;
}
// build a replacement array with braces around the context keys
$replace = array();
foreach ($context as $key => $val) {
$replace['{' . $key . '}'] = $val;
}
// interpolate replacement values into the the message and return
return strtr($message, $replace);
}
}