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* @author Jon Parise
* @since Horde 1.3
* @package Log
*/
class Log
{
private const DEFAULT_TIME_FORMAT = 'M d H:i:s';
/**
* Indicates whether or not the log can been opened / connected.
*/
protected bool $opened = false;
/**
* Instance-specific unique identification number.
*/
protected string $id = '0';
/**
* The label that uniquely identifies this set of log messages.
*/
protected string $ident = '';
/**
* The default priority to use when logging an event.
*/
protected int $priority = PEAR_LOG_INFO;
/**
* The bitmask of allowed log levels.
*/
protected int $mask = PEAR_LOG_ALL;
/**
* Holds all Log_observer objects that wish to be notified of new messages.
*/
protected array $listeners = [];
/**
* Starting depth to use when walking a backtrace in search of the
* function that invoked the log system.
*/
protected int $backtrace_depth = 0;
/**
* Maps canonical format keys to position arguments for use in building
* "line format" strings.
*/
protected array $formatMap = [
'%{timestamp}' => '%1$s',
'%{ident}' => '%2$s',
'%{priority}' => '%3$s',
'%{message}' => '%4$s',
'%{file}' => '%5$s',
'%{line}' => '%6$s',
'%{function}' => '%7$s',
'%{class}' => '%8$s',
'%\{' => '%%{',
];
public function __construct()
{
}
/**
* Attempts to return a concrete Log instance of type $handler.
*
* @param string $handler The type of concrete Log subclass to return.
* Attempt to dynamically include the code for
* this subclass. Currently, valid values are
* 'console', 'syslog', 'sql', 'file', and 'mcal'.
*
* @param string $name The name of the actually log file, table, or
* other specific store to use. Defaults to an
* empty string, with which the subclass will
* attempt to do something intelligent.
*
* @param string $ident The identity reported to the log system.
*
* @param array $conf A hash containing any additional configuration
* information that a subclass might need.
*
* @param int $level Log messages up to and including this level.
*
* @return object Log The newly created concrete Log instance, or
* null on an error.
* @since Log 1.0
*/
public static function factory(
string $handler,
string $name = '',
string $ident = '',
array $conf = [],
int $level = PEAR_LOG_DEBUG
): ?Log {
$handler = strtolower($handler);
$class = 'Log_' . $handler;
$classfile = 'Log/' . $handler . '.php';
/*
* Attempt to include our version of the named class, but don't treat
* a failure as fatal. The caller may have already included their own
* version of the named class.
*/
if (!class_exists($class, false)) {
include_once $classfile;
}
/* If the class exists, return a new instance of it. */
if (class_exists($class, false)) {
$obj = new $class($name, $ident, $conf, $level);
return $obj;
}
$null = null;
return $null;
}
/**
* Attempts to return a reference to a concrete Log instance of type
* $handler, only creating a new instance if no log instance with the same
* parameters currently exists.
*
* You should use this if there are multiple places you might create a
* logger, you don't want to create multiple loggers, and you don't want to
* check for the existance of one each time. The singleton pattern does all
* the checking work for you.
*
* You MUST call this method with the $var = &Log::singleton() syntax.
* Without the ampersand (&) in front of the method name, you will not get
* a reference, you will get a copy.
*
* @param string $handler The type of concrete Log subclass to return.
* Attempt to dynamically include the code for
* this subclass. Currently, valid values are
* 'console', 'syslog', 'sql', 'file', and 'mcal'.
*
* @param string $name The name of the actually log file, table, or
* other specific store to use. Defaults to an
* empty string, with which the subclass will
* attempt to do something intelligent.
*
* @param string $ident The identity reported to the log system.
*
* @param array $conf A hash containing any additional configuration
* information that a subclass might need.
*
* @param int $level Log messages up to and including this level.
*
* @return object Log The newly created concrete Log instance, or
* null on an error.
* @since Log 1.0
*/
public static function singleton(
string $handler,
string $name = '',
string $ident = '',
array $conf = [],
int $level = PEAR_LOG_DEBUG
): ?Log {
static $instances;
if (!isset($instances)) $instances = [];
$signature = serialize([$handler, $name, $ident, $conf, $level]);
if (!isset($instances[$signature])) {
$instances[$signature] = Log::factory($handler, $name, $ident,
$conf, $level);
}
return $instances[$signature];
}
/**
* Abstract implementation of the open() method.
* @since Log 1.0
*/
public function open(): bool
{
return false;
}
/**
* Abstract implementation of the close() method.
* @since Log 1.0
*/
public function close(): bool
{
return false;
}
/**
* Abstract implementation of the flush() method.
* @since Log 1.8.2
*/
public function flush(): bool
{
return false;
}
/**
* Abstract implementation of the log() method.
* @since Log 1.0
*/
public function log($message, ?int $priority = null): bool
{
return false;
}
/**
* A convenience function for logging a emergency event. It will log a
* message at the PEAR_LOG_EMERG log level.
*
* @param mixed $message String or object containing the message
* to log.
*
* @return boolean True if the message was successfully logged.
*
* @since Log 1.7.0
*/
public function emerg($message): bool
{
return $this->log($message, PEAR_LOG_EMERG);
}
/**
* A convenience function for logging an alert event. It will log a
* message at the PEAR_LOG_ALERT log level.
*
* @param mixed $message String or object containing the message
* to log.
*
* @return boolean True if the message was successfully logged.
*
* @since Log 1.7.0
*/
public function alert($message): bool
{
return $this->log($message, PEAR_LOG_ALERT);
}
/**
* A convenience function for logging a critical event. It will log a
* message at the PEAR_LOG_CRIT log level.
*
* @param mixed $message String or object containing the message
* to log.
*
* @return boolean True if the message was successfully logged.
*
* @since Log 1.7.0
*/
public function crit($message): bool
{
return $this->log($message, PEAR_LOG_CRIT);
}
/**
* A convenience function for logging a error event. It will log a
* message at the PEAR_LOG_ERR log level.
*
* @param mixed $message String or object containing the message
* to log.
*
* @return boolean True if the message was successfully logged.
*
* @since Log 1.7.0
*/
public function err($message): bool
{
return $this->log($message, PEAR_LOG_ERR);
}
/**
* A convenience function for logging a warning event. It will log a
* message at the PEAR_LOG_WARNING log level.
*
* @param mixed $message String or object containing the message
* to log.
*
* @return boolean True if the message was successfully logged.
*
* @since Log 1.7.0
*/
public function warning($message): bool
{
return $this->log($message, PEAR_LOG_WARNING);
}
/**
* A convenience function for logging a notice event. It will log a
* message at the PEAR_LOG_NOTICE log level.
*
* @param mixed $message String or object containing the message
* to log.
*
* @return boolean True if the message was successfully logged.
*
* @since Log 1.7.0
*/
public function notice($message): bool
{
return $this->log($message, PEAR_LOG_NOTICE);
}
/**
* A convenience function for logging a information event. It will log a
* message at the PEAR_LOG_INFO log level.
*
* @param mixed $message String or object containing the message
* to log.
*
* @return boolean True if the message was successfully logged.
*
* @since Log 1.7.0
*/
public function info($message): bool
{
return $this->log($message, PEAR_LOG_INFO);
}
/**
* A convenience function for logging a debug event. It will log a
* message at the PEAR_LOG_DEBUG log level.
*
* @param mixed $message String or object containing the message
* to log.
*
* @return boolean True if the message was successfully logged.
*
* @since Log 1.7.0
*/
public function debug($message): bool
{
return $this->log($message, PEAR_LOG_DEBUG);
}
/**
* Returns the string representation of the message data.
*
* If $message is an object, _extractMessage() will attempt to extract
* the message text using a known method (such as a PEAR_Error object's
* getMessage() method). If a known method, cannot be found, the
* serialized representation of the object will be returned.
*
* If the message data is already a string, it will be returned unchanged.
*
* @param mixed $message The original message data. This may be a
* string or any object.
*
* @return string The string representation of the message.
*
*/
protected function extractMessage($message): string
{
/*
* If we've been given an object, attempt to extract the message using
* a known method. If we can't find such a method, default to the
* "human-readable" version of the object.
*
* We also use the human-readable format for arrays.
*/
if (is_object($message)) {
if (method_exists($message, 'getmessage')) {
$message = (string)$message->getMessage();
} else if (method_exists($message, 'tostring')) {
$message = $message->toString();
} else if (method_exists($message, '__tostring')) {
$message = (string)$message;
} else {
$message = var_export($message, true);
}
} else if (is_array($message)) {
if (isset($message['message'])) {
if (is_scalar($message['message'])) {
$message = (string)$message['message'];
} else {
$message = var_export($message['message'], true);
}
} else {
$message = var_export($message, true);
}
} else if (is_bool($message) || $message === NULL) {
$message = var_export($message, true);
} else {
$message = (string)$message;
}
/* Otherwise, we assume the message is a string. */
return $message;
}
/**
* Using debug_backtrace(), returns the file, line, and enclosing function
* name of the source code context from which log() was invoked.
*
* @param int $depth The initial number of frames we should step
* back into the trace.
*
* @return array Array containing four strings: the filename, the line,
* the function name, and the class name from which log()
* was called.
*
* @since Log 1.9.4
*/
private function getBacktraceVars(int $depth): array
{
/* Start by generating a backtrace from the current call (here). */
$bt = debug_backtrace();
/* Store some handy shortcuts to our previous frames. */
$bt0 = $bt[$depth] ?? null;
$bt1 = $bt[$depth + 1] ?? null;
/*
* If we were ultimately invoked by the composite handler, we need to
* increase our depth one additional level to compensate.
*/
$class = $bt1['class'] ?? null;
if ($class !== null && strcasecmp($class, 'Log_composite') == 0) {
$depth++;
$bt0 = $bt[$depth] ?? null;
$bt1 = $bt[$depth + 1] ?? null;
$class = $bt1['class'] ?? null;
}
/*
* We're interested in the frame which invoked the log() function, so
* we need to walk back some number of frames into the backtrace. The
* $depth parameter tells us where to start looking. We go one step
* further back to find the name of the encapsulating function from
* which log() was called.
*/
$file = isset($bt0) ? $bt0['file'] : null;
$line = isset($bt0) ? $bt0['line'] : 0;
$func = isset($bt1) ? $bt1['function'] : null;
/*
* However, if log() was called from one of our "shortcut" functions,
* we're going to need to go back an additional step.
*/
if (in_array($func, ['emerg', 'alert', 'crit', 'err', 'warning', 'notice', 'info', 'debug'])) {
$bt2 = $bt[$depth + 2] ?? null;
$file = is_array($bt1) ? $bt1['file'] : null;
$line = is_array($bt1) ? $bt1['line'] : 0;
$func = is_array($bt2) ? $bt2['function'] : null;
$class = $bt2['class'] ?? null;
}
/*
* If we couldn't extract a function name (perhaps because we were
* executed from the "main" context), provide a default value.
*/
if ($func === null) {
$func = '(none)';
}
/* Return a 4-tuple containing (file, line, function, class). */
return [$file, $line, $func, $class];
}
/**
* Sets the starting depth to use when walking a backtrace in search of
* the function that invoked the log system. This is used on conjunction
* with the 'file', 'line', 'function', and 'class' formatters.
*
* @param int $depth The new backtrace depth.
*
* @since Log 1.12.7
*/
public function setBacktraceDepth(int $depth): void
{
$this->backtrace_depth = $depth;
}
/**
* Produces a formatted log line based on a format string and a set of
* variables representing the current log record and state.
*
* @return string Formatted log string.
*
* @since Log 1.9.4
*/
protected function format(string $format, string $timestamp, int $priority, string $message): string
{
/*
* If the format string references any of the backtrace-driven
* variables (%5 %6,%7,%8), generate the backtrace and fetch them.
*/
if (preg_match('/%[5678]/', $format)) {
/* Plus 2 to account for our internal function calls. */
$d = $this->backtrace_depth + 2;
[$file, $line, $func, $class] = $this->getBacktraceVars($d);
}
/*
* Build the formatted string. We use the sprintf() function's
* "argument swapping" capability to dynamically select and position
* the variables which will ultimately appear in the log string.
*/
return sprintf($format,
$timestamp,
$this->ident,
$this->priorityToString($priority),
$message,
$file ?? '',
$line ?? '',
$func ?? '',
$class ?? '');
}
/**
* Returns the string representation of a PEAR_LOG_* integer constant.
*
* @param int $priority A PEAR_LOG_* integer constant.
*
* @return string The string representation of $level.
*
* @since Log 1.0
*/
public function priorityToString(int $priority): string
{
$levels = [
PEAR_LOG_EMERG => 'emergency',
PEAR_LOG_ALERT => 'alert',
PEAR_LOG_CRIT => 'critical',
PEAR_LOG_ERR => 'error',
PEAR_LOG_WARNING => 'warning',
PEAR_LOG_NOTICE => 'notice',
PEAR_LOG_INFO => 'info',
PEAR_LOG_DEBUG => 'debug',
];
return $levels[$priority];
}
/**
* Returns the the PEAR_LOG_* integer constant for the given string
* representation of a priority name. This function performs a
* case-insensitive search.
*
* @param string $name String containing a priority name.
*
* @return int The PEAR_LOG_* integer contstant corresponding
* the the specified priority name.
*
* @since Log 1.9.0
*/
public function stringToPriority(string $name): int
{
$levels = [
'emergency' => PEAR_LOG_EMERG,
'alert' => PEAR_LOG_ALERT,
'critical' => PEAR_LOG_CRIT,
'error' => PEAR_LOG_ERR,
'warning' => PEAR_LOG_WARNING,
'notice' => PEAR_LOG_NOTICE,
'info' => PEAR_LOG_INFO,
'debug' => PEAR_LOG_DEBUG
];
return $levels[strtolower($name)];
}
/**
* Calculate the log mask for the given priority.
*
* This method may be called statically.
*
* @param integer $priority The priority whose mask will be calculated.
*
* @return integer The calculated log mask.
*
* @since Log 1.7.0
*/
public static function MASK(int $priority): int
{
return (1 << $priority);
}
/**
* Calculate the log mask for all priorities greater than or equal to the
* given priority. In other words, $priority will be the lowest priority
* matched by the resulting mask.
*
* This method may be called statically.
*
* @param integer $priority The minimum priority covered by this mask.
*
* @return integer The resulting log mask.
*
* @since Log 1.9.4
*/
public static function MIN(int $priority): int
{
return PEAR_LOG_ALL ^ ((1 << $priority) - 1);
}
/**
* Calculate the log mask for all priorities less than or equal to the
* given priority. In other words, $priority will be the highests priority
* matched by the resulting mask.
*
* This method may be called statically.
*
* @param integer $priority The maximum priority covered by this mask.
*
* @return integer The resulting log mask.
*
* @since Log 1.9.4
*/
public static function MAX(int $priority): int
{
return ((1 << ($priority + 1)) - 1);
}
/**
* Set and return the level mask for the current Log instance.
*
* @param integer $mask A bitwise mask of log levels.
*
* @return integer The current level mask.
*
* @since Log 1.7.0
*/
public function setMask(int $mask): int
{
$this->mask = $mask;
return $this->mask;
}
/**
* Returns the current level mask.
*
* @return integer The current level mask.
*
* @since Log 1.7.0
*/
public function getMask(): int
{
return $this->mask;
}
/**
* Check if the given priority is included in the current level mask.
*
* @param integer $priority The priority to check.
*
* @return boolean True if the given priority is included in the current
* log mask.
*
* @since Log 1.7.0
*/
protected function isMasked(int $priority): bool
{
return (bool)(Log::MASK($priority) & $this->mask);
}
/**
* Returns the current default priority.
*
* @return integer The current default priority.
*
* @since Log 1.8.4
*/
public function getPriority(): int
{
return $this->priority;
}
/**
* Sets the default priority to the specified value.
*
* @param integer $priority The new default priority.
*
* @since Log 1.8.4
*/
public function setPriority(int $priority): void
{
$this->priority = $priority;
}
/**
* Adds a Log_observer instance to the list of observers that are listening
* for messages emitted by this Log instance.
*
* @param Log_observer $observer The Log_observer instance to attach as a
* listener.
*
* @return boolean True if the observer is successfully attached.
*
* @since Log 1.0
*/
public function attach(Log_observer $observer): bool
{
$this->listeners[$observer->getId()] = $observer;
return true;
}
/**
* Removes a Log_observer instance from the list of observers.
*
* @param Log_observer $observer The Log_observer instance to detach from
* the list of listeners.
*
* @return boolean True if the observer is successfully detached.
*
* @since Log 1.0
*/
public function detach(Log_observer $observer): bool
{
if (!isset($this->listeners[$observer->getId()])) {
return false;
}
unset($this->listeners[$observer->getId()]);
return true;
}
/**
* Informs each registered observer instance that a new message has been
* logged.
*
* @param array $event A hash describing the log event.
*
*/
protected function announce(array $event): void
{
/**
* @var Log_observer $listener
*/
foreach ($this->listeners as $listener) {
if ($event['priority'] <= $listener->getPriority()) {
$listener->notify($event);
}
}
}
/**
* Indicates whether this is a composite class.
*
* @return boolean True if this is a composite class.
*
* @since Log 1.0
*/
public function isComposite(): bool
{
return false;
}
/**
* Sets this Log instance's identification string.
*
* @param string $ident The new identification string.
*
* @since Log 1.6.3
*/
public function setIdent(string $ident): void
{
$this->ident = $ident;
}
/**
* Returns the current identification string.
*
* @return string The current Log instance's identification string.
*
* @since Log 1.6.3
*/
public function getIdent(): string
{
return $this->ident;
}
/**
* Function to format unix timestamp in specified format, which will be used in log record
* By default will be used format self::DEFAULT_TIME_FORMAT
* timeFormatter function will be used if it is set
*
* @param int $time unix timestamp
* @param string $timeFormat specified format, which will be used in log record
* @param callable|null $timeFormatter function which will be used to format time
* @return string
*/
protected function formatTime(int $time, string $timeFormat = self::DEFAULT_TIME_FORMAT, ?callable $timeFormatter = null)
{
if (!is_null($timeFormatter) && is_callable($timeFormatter)) {
return call_user_func($timeFormatter, $timeFormat, $time);
}
if (strpos($timeFormat, '%') !== false) {
trigger_error('Using strftime-style formatting is deprecated', E_USER_WARNING);
$timeFormat = $this->convertStrftimeFormatConverter($timeFormat);
}
return date($timeFormat, $time);
}
/**-
* Function to convert strftime format to format acceptable by date function
*
* @param string $timeFormat
* @return string
*/
private function convertStrftimeFormatConverter(string $timeFormat): string
{
$strf_syntax = [
'%O', '%d', '%a', '%e', '%A', '%u', '%w', '%j',
'%V',
'%B', '%m', '%b', '%-m',
'%G', '%Y', '%y',
'%P', '%p', '%l', '%I', '%H', '%M', '%S',
'%z', '%Z',
'%s',
'%x', '%X',
];
// http://php.net/manual/en/function.date.php
$date_syntax = [
'S', 'd', 'D', 'j', 'l', 'N', 'w', 'z',
'W',
'F', 'm', 'M', 'n',
'o', 'Y', 'y',
'a', 'A', 'g', 'h', 'H', 'i', 's',
'O', 'T',
'U',
'm/d/Y', 'H:i:s',
];
$pattern = array_map(
fn($s) => '/(?