php-monolog/src/Monolog/Logger.php

<?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 Closure;
use DateTimeZone;
use Monolog\Handler\HandlerInterface;
use Monolog\Processor\ProcessorInterface;
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>
 */
class Logger implements LoggerInterface, ResettableInterface
{
    /**
     * Detailed debug information
     *
     * @deprecated Use \Monolog\Level::Debug
     */
    public const DEBUG = 100;

    /**
     * Interesting events
     *
     * Examples: User logs in, SQL logs.
     *
     * @deprecated Use \Monolog\Level::Info
     */
    public const INFO = 200;

    /**
     * Uncommon events
     *
     * @deprecated Use \Monolog\Level::Notice
     */
    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.
     *
     * @deprecated Use \Monolog\Level::Warning
     */
    public const WARNING = 300;

    /**
     * Runtime errors
     *
     * @deprecated Use \Monolog\Level::Error
     */
    public const ERROR = 400;

    /**
     * Critical conditions
     *
     * Example: Application component unavailable, unexpected exception.
     *
     * @deprecated Use \Monolog\Level::Critical
     */
    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.
     *
     * @deprecated Use \Monolog\Level::Alert
     */
    public const ALERT = 550;

    /**
     * Urgent alert.
     *
     * @deprecated Use \Monolog\Level::Emergency
     */
    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
     */
    public const API = 3;

    protected string $name;

    /**
     * The handler stack
     *
     * @var list<HandlerInterface>
     */
    protected array $handlers;

    /**
     * Processors that will process all log records
     *
     * To process records of a single handler instead, add the processor on that specific handler
     *
     * @var array<(callable(LogRecord): LogRecord)|ProcessorInterface>
     */
    protected array $processors;

    protected bool $microsecondTimestamps = true;

    protected DateTimeZone $timezone;

    protected Closure|null $exceptionHandler = null;

    /**
     * @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
     *
     * @phpstan-param array<(callable(LogRecord): LogRecord)|ProcessorInterface> $processors
     */
    public function __construct(string $name, array $handlers = [], array $processors = [], DateTimeZone|null $timezone = null)
    {
        $this->name = $name;
        $this->setHandlers($handlers);
        $this->processors = $processors;
        $this->timezone = $timezone ?? new DateTimeZone(date_default_timezone_get());
    }

    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 (0 === \count($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 list<HandlerInterface> $handlers
     */
    public function setHandlers(array $handlers): self
    {
        $this->handlers = [];
        foreach (array_reverse($handlers) as $handler) {
            $this->pushHandler($handler);
        }

        return $this;
    }

    /**
     * @return list<HandlerInterface>
     */
    public function getHandlers(): array
    {
        return $this->handlers;
    }

    /**
     * Adds a processor on to the stack.
     *
     * @phpstan-param ProcessorInterface|(callable(LogRecord): LogRecord) $callback
     */
    public function pushProcessor(ProcessorInterface|callable $callback): self
    {
        array_unshift($this->processors, $callback);

        return $this;
    }

    /**
     * Removes the processor on top of the stack and returns it.
     *
     * @phpstan-return ProcessorInterface|(callable(LogRecord): LogRecord)
     * @throws \LogicException If empty processor stack
     */
    public function popProcessor(): callable
    {
        if (0 === \count($this->processors)) {
            throw new \LogicException('You tried to pop from an empty processor stack.');
        }

        return array_shift($this->processors);
    }

    /**
     * @return callable[]
     * @phpstan-return array<ProcessorInterface|(callable(LogRecord): LogRecord)>
     */
    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;
    }

    /**
     * Adds a log record.
     *
     * @param  int     $level   The logging level
     * @param  string  $message The log message
     * @param  mixed[] $context The log context
     * @return bool    Whether the record has been processed
     *
     * @phpstan-param value-of<Level::VALUES>|Level $level
     */
    public function addRecord(int|Level $level, string $message, array $context = []): bool
    {
        $recordInitialized = count($this->processors) === 0;

        $record = new LogRecord(
            message: $message,
            context: $context,
            level: self::toMonologLevel($level),
            channel: $this->name,
            datetime: new DateTimeImmutable($this->microsecondTimestamps, $this->timezone),
            extra: [],
        );
        $handled = false;

        foreach ($this->handlers as $handler) {
            if (false === $recordInitialized) {
                // skip initializing the record as long as no handler is going to handle it
                if (!$handler->isHandling($record)) {
                    continue;
                }

                try {
                    foreach ($this->processors as $processor) {
                        $record = $processor($record);
                    }
                    $recordInitialized = true;
                } catch (Throwable $e) {
                    $this->handleException($e, $record);

                    return true;
                }
            }

            // once the record is initialized, send it to all handlers as long as the bubbling chain is not interrupted
            try {
                $handled = true;
                if (true === $handler->handle($record)) {
                    break;
                }
            } catch (Throwable $e) {
                $this->handleException($e, $record);

                return true;
            }
        }

        return $handled;
    }

    /**
     * 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();
            }
        }
    }

    /**
     * Converts PSR-3 levels to Monolog ones if necessary
     *
     * @param  int|string|Level|LevelName|LogLevel::* $level Level number (monolog) or name (PSR-3)
     * @throws \Psr\Log\InvalidArgumentException      If level is not defined
     *
     * @phpstan-param value-of<Level::VALUES>|value-of<LevelName::VALUES>|Level|LevelName|LogLevel::* $level
     */
    public static function toMonologLevel(string|int|Level|LevelName $level): Level
    {
        if ($level instanceof Level) {
            return $level;
        }

        if ($level instanceof LevelName) {
            return $level->toLevel();
        }

        if (\is_string($level)) {
            if (\is_numeric($level)) {
                $levelEnum = Level::tryFrom((int) $level);
                if ($levelEnum === null) {
                    throw new InvalidArgumentException('Level "'.$level.'" is not defined, use one of: '.implode(', ', LevelName::VALUES + Level::VALUES));
                }

                return $levelEnum;
            }

            // Contains first char 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)
            $upper = strtr(substr($level, 0, 1), 'dinweca', 'DINWECA') . strtolower(substr($level, 1));
            if (defined(Level::class.'::'.$upper)) {
                return constant(Level::class . '::' . $upper);
            }

            throw new InvalidArgumentException('Level "'.$level.'" is not defined, use one of: '.implode(', ', LevelName::VALUES + Level::VALUES));
        }

        $levelEnum = Level::tryFrom($level);
        if ($levelEnum === null) {
            throw new InvalidArgumentException('Level "'.var_export($level, true).'" is not defined, use one of: '.implode(', ', LevelName::VALUES + Level::VALUES));
        }

        return $levelEnum;
    }

    /**
     * Checks whether the Logger has a handler that listens on the given level
     *
     * @phpstan-param value-of<Level::VALUES>|value-of<LevelName::VALUES>|Level|LevelName|LogLevel::* $level
     */
    public function isHandling(int|string|LevelName|Level $level): bool
    {
        $record = new LogRecord(
            datetime: new DateTimeImmutable($this->microsecondTimestamps, $this->timezone),
            channel: $this->name,
            message: '',
            level: self::toMonologLevel($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 Closure will receive an exception object and the record that failed to be logged
     */
    public function setExceptionHandler(Closure|null $callback): self
    {
        $this->exceptionHandler = $callback;

        return $this;
    }

    public function getExceptionHandler(): Closure|null
    {
        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
     * @param string|Stringable $message The log message
     * @param mixed[]           $context The log context
     *
     * @phpstan-param Level|LevelName|LogLevel::* $level
     */
    public function log($level, string|\Stringable $message, array $context = []): void
    {
        if (!is_string($level) && !is_int($level) && !$level instanceof Level) {
            throw new \InvalidArgumentException('$level is expected to be a string, int or '.Level::class.' instance');
        }

        $level = static::toMonologLevel($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(string|\Stringable $message, array $context = []): void
    {
        $this->addRecord(Level::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(string|\Stringable $message, array $context = []): void
    {
        $this->addRecord(Level::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(string|\Stringable $message, array $context = []): void
    {
        $this->addRecord(Level::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(string|\Stringable $message, array $context = []): void
    {
        $this->addRecord(Level::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(string|\Stringable $message, array $context = []): void
    {
        $this->addRecord(Level::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(string|\Stringable $message, array $context = []): void
    {
        $this->addRecord(Level::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(string|\Stringable $message, array $context = []): void
    {
        $this->addRecord(Level::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(string|\Stringable $message, array $context = []): void
    {
        $this->addRecord(Level::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.
     */
    protected function handleException(Throwable $e, LogRecord $record): void
    {
        if (null === $this->exceptionHandler) {
            throw $e;
        }

        ($this->exceptionHandler)($e, $record);
    }
}