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<?php declare(strict_types=1);
/*
* This file is part of the Monolog package.
*
* (c) Jordi Boggiano <j.boggiano@seld.be>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Monolog;
use DateTimeZone;
use Monolog\Handler\HandlerInterface;
use Psr\Log\LoggerInterface;
use Psr\Log\InvalidArgumentException;
use Psr\Log\LogLevel;
use Throwable;
use Stringable;
/**
* Monolog log channel
*
* It contains a stack of Handlers and a stack of Processors,
* and uses them to store records that are added to it.
*
* @author Jordi Boggiano <j.boggiano@seld.be>
*
* @phpstan-type Level Logger::DEBUG|Logger::INFO|Logger::NOTICE|Logger::WARNING|Logger::ERROR|Logger::CRITICAL|Logger::ALERT|Logger::EMERGENCY
* @phpstan-type LevelName 'DEBUG'|'INFO'|'NOTICE'|'WARNING'|'ERROR'|'CRITICAL'|'ALERT'|'EMERGENCY'
* @phpstan-type Record array{message: string, context: mixed[], level: Level, level_name: LevelName, channel: string, datetime: \DateTimeImmutable, extra: mixed[]}
*/
class Logger implements LoggerInterface, ResettableInterface
{
/**
* Detailed debug information
*/
public const DEBUG = 100;
/**
* Interesting events
*
* Examples: User logs in, SQL logs.
*/
public const INFO = 200;
/**
* Uncommon events
*/
public const NOTICE = 250;
/**
* Exceptional occurrences that are not errors
*
* Examples: Use of deprecated APIs, poor use of an API,
* undesirable things that are not necessarily wrong.
*/
public const WARNING = 300;
/**
* Runtime errors
*/
public const ERROR = 400;
/**
* Critical conditions
*
* Example: Application component unavailable, unexpected exception.
*/
public const CRITICAL = 500;
/**
* Action must be taken immediately
*
* Example: Entire website down, database unavailable, etc.
* This should trigger the SMS alerts and wake you up.
*/
public const ALERT = 550;
/**
* Urgent alert.
*/
public const EMERGENCY = 600;
/**
* Monolog API version
*
* This is only bumped when API breaks are done and should
* follow the major version of the library
*
* @var int
*/
public const API = 2;
/**
* This is a static variable and not a constant to serve as an extension point for custom levels
*
* @var array<int, string> $levels Logging levels with the levels as key
*
* @phpstan-var array<Level, LevelName> $levels Logging levels with the levels as key
*/
protected static $levels = [
self::DEBUG => 'DEBUG',
self::INFO => 'INFO',
self::NOTICE => 'NOTICE',
self::WARNING => 'WARNING',
self::ERROR => 'ERROR',
self::CRITICAL => 'CRITICAL',
self::ALERT => 'ALERT',
self::EMERGENCY => 'EMERGENCY',
];
/**
* Mapping between levels numbers defined in RFC 5424 and Monolog ones
*
* @phpstan-var array<int, Level> $rfc_5424_levels
*/
private const RFC_5424_LEVELS = [
7 => self::DEBUG,
6 => self::INFO,
5 => self::NOTICE,
4 => self::WARNING,
3 => self::ERROR,
2 => self::CRITICAL,
1 => self::ALERT,
0 => self::EMERGENCY,
];
/**
* @var string
*/
protected $name;
/**
* The handler stack
*
* @var HandlerInterface[]
*/
protected $handlers;
/**
* Processors that will process all log records
*
* To process records of a single handler instead, add the processor on that specific handler
*
* @var callable[]
*/
protected $processors;
/**
* @var bool
*/
protected $microsecondTimestamps = true;
/**
* @var DateTimeZone
*/
protected $timezone;
/**
* @var callable|null
*/
protected $exceptionHandler;
/**
* @var int Keeps track of depth to prevent infinite logging loops
*/
private $logDepth = 0;
/**
* @var bool Whether to detect infinite logging loops
*
* This can be disabled via {@see useLoggingLoopDetection} if you have async handlers that do not play well with this
*/
private $detectCycles = true;
/**
* @psalm-param array<callable(array): array> $processors
*
* @param string $name The logging channel, a simple descriptive name that is attached to all log records
* @param HandlerInterface[] $handlers Optional stack of handlers, the first one in the array is called first, etc.
* @param callable[] $processors Optional array of processors
* @param DateTimeZone|null $timezone Optional timezone, if not provided date_default_timezone_get() will be used
*/
public function __construct(string $name, array $handlers = [], array $processors = [], ?DateTimeZone $timezone = null)
{
$this->name = $name;
$this->setHandlers($handlers);
$this->processors = $processors;
$this->timezone = $timezone ?: new DateTimeZone(date_default_timezone_get() ?: 'UTC');
}
public function getName(): string
{
return $this->name;
}
/**
* Return a new cloned instance with the name changed
*/
public function withName(string $name): self
{
$new = clone $this;
$new->name = $name;
return $new;
}
/**
* Pushes a handler on to the stack.
*/
public function pushHandler(HandlerInterface $handler): self
{
array_unshift($this->handlers, $handler);
return $this;
}
/**
* Pops a handler from the stack
*
* @throws \LogicException If empty handler stack
*/
public function popHandler(): HandlerInterface
{
if (!$this->handlers) {
throw new \LogicException('You tried to pop from an empty handler stack.');
}
return array_shift($this->handlers);
}
/**
* Set handlers, replacing all existing ones.
*
* If a map is passed, keys will be ignored.
*
* @param HandlerInterface[] $handlers
*/
public function setHandlers(array $handlers): self
{
$this->handlers = [];
foreach (array_reverse($handlers) as $handler) {
$this->pushHandler($handler);
}
return $this;
}
/**
* @return HandlerInterface[]
*/
public function getHandlers(): array
{
return $this->handlers;
}
/**
* Adds a processor on to the stack.
*/
public function pushProcessor(callable $callback): self
{
array_unshift($this->processors, $callback);
return $this;
}
/**
* Removes the processor on top of the stack and returns it.
*
* @throws \LogicException If empty processor stack
* @return callable
*/
public function popProcessor(): callable
{
if (!$this->processors) {
throw new \LogicException('You tried to pop from an empty processor stack.');
}
return array_shift($this->processors);
}
/**
* @return callable[]
*/
public function getProcessors(): array
{
return $this->processors;
}
/**
* Control the use of microsecond resolution timestamps in the 'datetime'
* member of new records.
*
* As of PHP7.1 microseconds are always included by the engine, so
* there is no performance penalty and Monolog 2 enabled microseconds
* by default. This function lets you disable them though in case you want
* to suppress microseconds from the output.
*
* @param bool $micro True to use microtime() to create timestamps
*/
public function useMicrosecondTimestamps(bool $micro): self
{
$this->microsecondTimestamps = $micro;
return $this;
}
public function useLoggingLoopDetection(bool $detectCycles): self
{
$this->detectCycles = $detectCycles;
return $this;
}
/**
* Adds a log record.
*
* @param int $level The logging level (a Monolog or RFC 5424 level)
* @param string $message The log message
* @param mixed[] $context The log context
* @param DateTimeImmutable $datetime Optional log date to log into the past or future
* @return bool Whether the record has been processed
*
* @phpstan-param Level $level
*/
public function addRecord(int $level, string $message, array $context = [], DateTimeImmutable $datetime = null): bool
{
if (isset(self::RFC_5424_LEVELS[$level])) {
$level = self::RFC_5424_LEVELS[$level];
}
if ($this->detectCycles) {
$this->logDepth += 1;
}
if ($this->logDepth === 3) {
$this->warning('A possible infinite logging loop was detected and aborted. It appears some of your handler code is triggering logging, see the previous log record for a hint as to what may be the cause.');
return false;
} elseif ($this->logDepth >= 5) { // log depth 4 is let through so we can log the warning above
return false;
}
try {
$record = null;
foreach ($this->handlers as $handler) {
if (null === $record) {
// skip creating the record as long as no handler is going to handle it
if (!$handler->isHandling(['level' => $level])) {
continue;
}
$levelName = static::getLevelName($level);
$record = [
'message' => $message,
'context' => $context,
'level' => $level,
'level_name' => $levelName,
'channel' => $this->name,
'datetime' => $datetime ?? new DateTimeImmutable($this->microsecondTimestamps, $this->timezone),
'extra' => [],
];
try {
foreach ($this->processors as $processor) {
$record = $processor($record);
}
} catch (Throwable $e) {
$this->handleException($e, $record);
return true;
}
}
// once the record exists, send it to all handlers as long as the bubbling chain is not interrupted
try {
if (true === $handler->handle($record)) {
break;
}
} catch (Throwable $e) {
$this->handleException($e, $record);
return true;
}
}
} finally {
if ($this->detectCycles) {
$this->logDepth--;
}
}
return null !== $record;
}
/**
* Ends a log cycle and frees all resources used by handlers.
*
* Closing a Handler means flushing all buffers and freeing any open resources/handles.
* Handlers that have been closed should be able to accept log records again and re-open
* themselves on demand, but this may not always be possible depending on implementation.
*
* This is useful at the end of a request and will be called automatically on every handler
* when they get destructed.
*/
public function close(): void
{
foreach ($this->handlers as $handler) {
$handler->close();
}
}
/**
* Ends a log cycle and resets all handlers and processors to their initial state.
*
* Resetting a Handler or a Processor means flushing/cleaning all buffers, resetting internal
* state, and getting it back to a state in which it can receive log records again.
*
* This is useful in case you want to avoid logs leaking between two requests or jobs when you
* have a long running process like a worker or an application server serving multiple requests
* in one process.
*/
public function reset(): void
{
foreach ($this->handlers as $handler) {
if ($handler instanceof ResettableInterface) {
$handler->reset();
}
}
foreach ($this->processors as $processor) {
if ($processor instanceof ResettableInterface) {
$processor->reset();
}
}
}
/**
* Gets all supported logging levels.
*
* @return array<string, int> Assoc array with human-readable level names => level codes.
* @phpstan-return array<LevelName, Level>
*/
public static function getLevels(): array
{
return array_flip(static::$levels);
}
/**
* Gets the name of the logging level.
*
* @throws \Psr\Log\InvalidArgumentException If level is not defined
*
* @phpstan-param Level $level
* @phpstan-return LevelName
*/
public static function getLevelName(int $level): string
{
if (!isset(static::$levels[$level])) {
throw new InvalidArgumentException('Level "'.$level.'" is not defined, use one of: '.implode(', ', array_keys(static::$levels)));
}
return static::$levels[$level];
}
/**
* Converts PSR-3 levels to Monolog ones if necessary
*
* @param string|int $level Level number (monolog) or name (PSR-3)
* @throws \Psr\Log\InvalidArgumentException If level is not defined
*
* @phpstan-param Level|LevelName|LogLevel::* $level
* @phpstan-return Level
*/
public static function toMonologLevel($level): int
{
if (is_string($level)) {
if (is_numeric($level)) {
/** @phpstan-ignore-next-line */
return intval($level);
}
// Contains chars of all log levels and avoids using strtoupper() which may have
// strange results depending on locale (for example, "i" will become "İ" in Turkish locale)
$upper = strtr($level, 'abcdefgilmnortuwy', 'ABCDEFGILMNORTUWY');
if (defined(__CLASS__.'::'.$upper)) {
return constant(__CLASS__ . '::' . $upper);
}
throw new InvalidArgumentException('Level "'.$level.'" is not defined, use one of: '.implode(', ', array_keys(static::$levels) + static::$levels));
}
if (!is_int($level)) {
throw new InvalidArgumentException('Level "'.var_export($level, true).'" is not defined, use one of: '.implode(', ', array_keys(static::$levels) + static::$levels));
}
return $level;
}
/**
* Checks whether the Logger has a handler that listens on the given level
*
* @phpstan-param Level $level
*/
public function isHandling(int $level): bool
{
$record = [
'level' => $level,
];
foreach ($this->handlers as $handler) {
if ($handler->isHandling($record)) {
return true;
}
}
return false;
}
/**
* Set a custom exception handler that will be called if adding a new record fails
*
* The callable will receive an exception object and the record that failed to be logged
*/
public function setExceptionHandler(?callable $callback): self
{
$this->exceptionHandler = $callback;
return $this;
}
public function getExceptionHandler(): ?callable
{
return $this->exceptionHandler;
}
/**
* Adds a log record at an arbitrary level.
*
* This method allows for compatibility with common interfaces.
*
* @param mixed $level The log level (a Monolog, PSR-3 or RFC 5424 level)
* @param string|Stringable $message The log message
* @param mixed[] $context The log context
*
* @phpstan-param Level|LevelName|LogLevel::* $level
*/
public function log($level, $message, array $context = []): void
{
if (!is_int($level) && !is_string($level)) {
throw new \InvalidArgumentException('$level is expected to be a string or int');
}
if (isset(self::RFC_5424_LEVELS[$level])) {
$level = self::RFC_5424_LEVELS[$level];
}
$level = static::toMonologLevel($level);
$this->addRecord($level, (string) $message, $context);
}
/**
* Adds a log record at the DEBUG level.
*
* This method allows for compatibility with common interfaces.
*
* @param string|Stringable $message The log message
* @param mixed[] $context The log context
*/
public function debug($message, array $context = []): void
{
$this->addRecord(static::DEBUG, (string) $message, $context);
}
/**
* Adds a log record at the INFO level.
*
* This method allows for compatibility with common interfaces.
*
* @param string|Stringable $message The log message
* @param mixed[] $context The log context
*/
public function info($message, array $context = []): void
{
$this->addRecord(static::INFO, (string) $message, $context);
}
/**
* Adds a log record at the NOTICE level.
*
* This method allows for compatibility with common interfaces.
*
* @param string|Stringable $message The log message
* @param mixed[] $context The log context
*/
public function notice($message, array $context = []): void
{
$this->addRecord(static::NOTICE, (string) $message, $context);
}
/**
* Adds a log record at the WARNING level.
*
* This method allows for compatibility with common interfaces.
*
* @param string|Stringable $message The log message
* @param mixed[] $context The log context
*/
public function warning($message, array $context = []): void
{
$this->addRecord(static::WARNING, (string) $message, $context);
}
/**
* Adds a log record at the ERROR level.
*
* This method allows for compatibility with common interfaces.
*
* @param string|Stringable $message The log message
* @param mixed[] $context The log context
*/
public function error($message, array $context = []): void
{
$this->addRecord(static::ERROR, (string) $message, $context);
}
/**
* Adds a log record at the CRITICAL level.
*
* This method allows for compatibility with common interfaces.
*
* @param string|Stringable $message The log message
* @param mixed[] $context The log context
*/
public function critical($message, array $context = []): void
{
$this->addRecord(static::CRITICAL, (string) $message, $context);
}
/**
* Adds a log record at the ALERT level.
*
* This method allows for compatibility with common interfaces.
*
* @param string|Stringable $message The log message
* @param mixed[] $context The log context
*/
public function alert($message, array $context = []): void
{
$this->addRecord(static::ALERT, (string) $message, $context);
}
/**
* Adds a log record at the EMERGENCY level.
*
* This method allows for compatibility with common interfaces.
*
* @param string|Stringable $message The log message
* @param mixed[] $context The log context
*/
public function emergency($message, array $context = []): void
{
$this->addRecord(static::EMERGENCY, (string) $message, $context);
}
/**
* Sets the timezone to be used for the timestamp of log records.
*/
public function setTimezone(DateTimeZone $tz): self
{
$this->timezone = $tz;
return $this;
}
/**
* Returns the timezone to be used for the timestamp of log records.
*/
public function getTimezone(): DateTimeZone
{
return $this->timezone;
}
/**
* Delegates exception management to the custom exception handler,
* or throws the exception if no custom handler is set.
*
* @param array $record
* @phpstan-param Record $record
*/
protected function handleException(Throwable $e, array $record): void
{
if (!$this->exceptionHandler) {
throw $e;
}
($this->exceptionHandler)($e, $record);
}
}
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