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<?php
/**
* Piwik - free/libre analytics platform
*
* @link http://piwik.org
* @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
*/
namespace Piwik;
use Piwik\Container\StaticContainer;
use Piwik\Db;
use Piwik\Log\DatabaseBackend;
use Piwik\Log\FileBackend;
use Piwik\Log\ScreenBackend;
/**
* Logging utility class.
*
* Log entries are made with a message and log level. The logging utility will tag each
* log entry with the name of the plugin that's doing the logging. If no plugin is found,
* the name of the current class is used.
*
* You can log messages using one of the public static functions (eg, 'error', 'warning',
* 'info', etc.). Messages logged with the **error** level will **always** be logged to
* the screen, regardless of whether the [log] log_writer config option includes the
* screen writer.
*
* Currently, Piwik supports the following logging backends:
*
* - **screen**: logging to the screen
* - **file**: logging to a file
* - **database**: logging to Piwik's MySQL database
*
* ### Logging configuration
*
* The logging utility can be configured by manipulating the INI config options in the
* `[log]` section.
*
* The following configuration options can be set:
*
* - `log_writers[]`: This is an array of log writer IDs. The three log writers provided
* by Piwik core are **file**, **screen** and **database**. You can
* get more by installing plugins. The default value is **screen**.
* - `log_level`: The current log level. Can be **ERROR**, **WARN**, **INFO**, **DEBUG**,
* or **VERBOSE**. Log entries made with a log level that is as or more
* severe than the current log level will be outputted. Others will be
* ignored. The default level is **WARN**.
* - `log_only_when_cli`: 0 or 1. If 1, logging is only enabled when Piwik is executed
* in the command line (for example, by the core:archive command
* script). Default: 0.
* - `log_only_when_debug_parameter`: 0 or 1. If 1, logging is only enabled when the
* `debug` query parameter is 1. Default: 0.
* - `logger_file_path`: For the file log writer, specifies the path to the log file
* to log to or a path to a directory to store logs in. If a
* directory, the file name is piwik.log. Can be relative to
* Piwik's root dir or an absolute path. Defaults to **tmp/logs**.
*
* ### Custom message formatting
*
* If you'd like to format log messages differently for different backends, you can use
* one of the `'Log.format...Message'` events.
*
* These events are fired when an object is logged. You can create your own custom class
* containing the information to log and listen to these events to format it correctly for
* different backends.
*
* If you don't care about the backend when formatting an object, implement a `__toString()`
* in the custom class.
*
* ### Custom log writers
*
* New logging backends can be added via the {@hook Log.getAvailableWriters}` event. A log
* writer is just a callback that accepts log entry information (such as the message,
* level, etc.), so any backend could conceivably be used (including existing PSR3
* backends).
*
* ### Examples
*
* **Basic logging**
*
* Log::error("This log message will end up on the screen and in a file.")
* Log::verbose("This log message uses %s params, but %s will only be called if the"
* . " configured log level includes %s.", "sprintf", "sprintf", "verbose");
*
* **Logging objects**
*
* class MyDebugInfo
* {
* // ...
*
* public function __toString()
* {
* return // ...
* }
* }
*
* try {
* $myThirdPartyServiceClient->doSomething();
* } catch (Exception $unexpectedError) {
* $debugInfo = new MyDebugInfo($unexpectedError, $myThirdPartyServiceClient);
* Log::debug($debugInfo);
* }
*/
class Log extends Singleton
{
// log levels
const NONE = 0;
const ERROR = 1;
const WARN = 2;
const INFO = 3;
const DEBUG = 4;
const VERBOSE = 5;
// config option names
const LOG_LEVEL_CONFIG_OPTION = 'log_level';
const LOG_WRITERS_CONFIG_OPTION = 'log_writers';
const LOGGER_FILE_PATH_CONFIG_OPTION = 'logger_file_path';
const STRING_MESSAGE_FORMAT_OPTION = 'string_message_format';
const FORMAT_FILE_MESSAGE_EVENT = 'Log.formatFileMessage';
const FORMAT_SCREEN_MESSAGE_EVENT = 'Log.formatScreenMessage';
const FORMAT_DATABASE_MESSAGE_EVENT = 'Log.formatDatabaseMessage';
const GET_AVAILABLE_WRITERS_EVENT = 'Log.getAvailableWriters';
/**
* Singleton instance.
*
* @var Log
*/
private static $instance;
/**
* The current logging level. Everything of equal or greater priority will be logged.
* Everything else will be ignored.
*
* @var int
*/
private $currentLogLevel = self::WARN;
/**
* The array of callbacks executed when logging to a file. Each callback writes a log
* message to a logging backend.
*
* @var array
*/
private $writers = array();
/**
* The log message format string that turns a tag name, date-time and message into
* one string to log.
*
* @var string
*/
private $logMessageFormat;
/**
* If we're logging to a file, this is the path to the file to log to.
*
* @var string
*/
private $logToFilePath;
/**
* True if we're currently setup to log to a screen, false if otherwise.
*
* @var bool
*/
private $loggingToScreen;
public static function getInstance()
{
if (self::$instance === null) {
self::$instance = StaticContainer::getContainer()->get(__CLASS__);
}
return self::$instance;
}
public static function unsetInstance()
{
self::$instance = null;
}
public static function setSingletonInstance($instance)
{
self::$instance = $instance;
}
/**
* @param string $logMessageFormat
* @param string $logToFilePath
* @param int $logLevel
*/
public function __construct($logMessageFormat, $logToFilePath, $logLevel)
{
$this->logMessageFormat = $logMessageFormat;
$this->logToFilePath = $logToFilePath;
$this->currentLogLevel = $logLevel;
}
/**
* Logs a message using the ERROR log level.
*
* _Note: Messages logged with the ERROR level are always logged to the screen in addition
* to configured writers._
*
* @param string $message The log message. This can be a sprintf format string.
* @param ... mixed Optional sprintf params.
* @api
*/
public static function error($message /* ... */)
{
self::logMessage(self::ERROR, $message, array_slice(func_get_args(), 1));
}
/**
* Logs a message using the WARNING log level.
*
* @param string $message The log message. This can be a sprintf format string.
* @param ... mixed Optional sprintf params.
* @api
*/
public static function warning($message /* ... */)
{
self::logMessage(self::WARN, $message, array_slice(func_get_args(), 1));
}
/**
* Logs a message using the INFO log level.
*
* @param string $message The log message. This can be a sprintf format string.
* @param ... mixed Optional sprintf params.
* @api
*/
public static function info($message /* ... */)
{
self::logMessage(self::INFO, $message, array_slice(func_get_args(), 1));
}
/**
* Logs a message using the DEBUG log level.
*
* @param string $message The log message. This can be a sprintf format string.
* @param ... mixed Optional sprintf params.
* @api
*/
public static function debug($message /* ... */)
{
self::logMessage(self::DEBUG, $message, array_slice(func_get_args(), 1));
}
/**
* Logs a message using the VERBOSE log level.
*
* @param string $message The log message. This can be a sprintf format string.
* @param ... mixed Optional sprintf params.
* @api
*/
public static function verbose($message /* ... */)
{
self::logMessage(self::VERBOSE, $message, array_slice(func_get_args(), 1));
}
/**
* Creates log message combining logging info including a log level, tag name,
* date time, and caller-provided log message. The log message can be set through
* the `[log] string_message_format` INI config option. By default it will
* create log messages like:
*
* **LEVEL [tag:datetime] log message**
*
* @param int $level
* @param string $tag
* @param string $datetime
* @param string $message
* @return string
*/
public function formatMessage($level, $tag, $datetime, $message)
{
return str_replace(
array("%tag%", "%message%", "%datetime%", "%level%"),
array($tag, trim($message), $datetime, $this->getStringLevel($level)),
$this->logMessageFormat
);
}
public function addLogWriter($writerName)
{
if (array_key_exists($writerName, $this->writers)) {
return;
}
$availableWritersByName = $this->getAvailableWriters();
if (empty($availableWritersByName[$writerName])) {
return;
}
$this->writers[$writerName] = $availableWritersByName[$writerName];
}
private function getAvailableWriters()
{
$writers = array();
/**
* This event is called when the Log instance is created. Plugins can use this event to
* make new logging writers available.
*
* A logging writer is a callback with the following signature:
*
* function (int $level, string $tag, string $datetime, string $message)
*
* `$level` is the log level to use, `$tag` is the log tag used, `$datetime` is the date time
* of the logging call and `$message` is the formatted log message.
*
* Logging writers must be associated by name in the array passed to event handlers. The
* name specified can be used in Piwik's INI configuration.
*
* **Example**
*
* public function getAvailableWriters(&$writers) {
* $writers['myloggername'] = function ($level, $tag, $datetime, $message) {
* // ...
* };
* }
*
* // 'myloggername' can now be used in the log_writers config option.
*
* @param array $writers Array mapping writer names with logging writers.
*/
Piwik::postEvent(self::GET_AVAILABLE_WRITERS_EVENT, array(&$writers));
$writers['file'] = new FileBackend($this->logMessageFormat, $this->logToFilePath);
$writers['screen'] = new ScreenBackend($this->logMessageFormat);
$writers['database'] = new DatabaseBackend($this->logMessageFormat);
return $writers;
}
public function setLogLevel($logLevel)
{
$this->currentLogLevel = $logLevel;
}
public function getLogLevel()
{
return $this->currentLogLevel;
}
private function doLog($level, $message, $sprintfParams = array())
{
if (!$this->shouldLoggerLog($level)) {
return;
}
$datetime = date("Y-m-d H:i:s");
if (is_string($message)
&& !empty($sprintfParams)
) {
// handle array sprintf parameters
foreach ($sprintfParams as &$param) {
if (is_array($param)) {
$param = json_encode($param);
}
}
$message = vsprintf($message, $sprintfParams);
}
if (version_compare(phpversion(), '5.3.6', '>=')) {
$backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS | DEBUG_BACKTRACE_PROVIDE_OBJECT);
} else {
$backtrace = debug_backtrace();
}
$tag = Plugin::getPluginNameFromBacktrace($backtrace);
// if we can't determine the plugin, use the name of the calling class
if ($tag == false) {
$tag = $this->getClassNameThatIsLogging($backtrace);
}
$this->writeMessage($level, $tag, $datetime, $message);
}
private function writeMessage($level, $tag, $datetime, $message)
{
foreach ($this->writers as $writer) {
call_user_func($writer, $level, $tag, $datetime, $message, $this);
}
if ($level == self::ERROR) {
$writers = $this->getAvailableWriters();
/** @var ScreenBackend $screenBackend */
$screenBackend = $writers['screen'];
$message = $screenBackend->getMessageFormattedScreen($level, $tag, $datetime, $message, $this);
$this->writeErrorToStandardErrorOutput($message);
if (!isset($this->writers['screen'])) {
echo $message;
}
}
}
private static function logMessage($level, $message, $sprintfParams)
{
self::getInstance()->doLog($level, $message, $sprintfParams);
}
private function shouldLoggerLog($level)
{
return $level <= $this->currentLogLevel;
}
private function getStringLevel($level)
{
static $levelToName = array(
self::NONE => 'NONE',
self::ERROR => 'ERROR',
self::WARN => 'WARN',
self::INFO => 'INFO',
self::DEBUG => 'DEBUG',
self::VERBOSE => 'VERBOSE'
);
return $levelToName[$level];
}
private function getClassNameThatIsLogging($backtrace)
{
foreach ($backtrace as $tracepoint) {
if (isset($tracepoint['class'])
&& $tracepoint['class'] != "Piwik\\Log"
&& $tracepoint['class'] != "Piwik\\Piwik"
&& $tracepoint['class'] != "Piwik\\CronArchive"
) {
return $tracepoint['class'];
}
}
return false;
}
/**
* @param $message
*/
private function writeErrorToStandardErrorOutput($message)
{
if (defined('PIWIK_TEST_MODE')) {
// do not log on stderr during tests (prevent display of errors in CI output)
return;
}
$fe = fopen('php://stderr', 'w');
fwrite($fe, $message);
}
}
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