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✏️ Editing: OverflowHandler.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\Handler;

use Monolog\Level;
use Monolog\Formatter\FormatterInterface;
use Monolog\LogRecord;

/**
 * Handler to only pass log messages when a certain threshold of number of messages is reached.
 *
 * This can be useful in cases of processing a batch of data, but you're for example only interested
 * in case it fails catastrophically instead of a warning for 1 or 2 events. Worse things can happen, right?
 *
 * Usage example:
 *
 * ```
 *   $log = new Logger('application');
 *   $handler = new SomeHandler(...)
 *
 *   // Pass all warnings to the handler when more than 10 & all error messages when more then 5
 *   $overflow = new OverflowHandler($handler, [Level::Warning->value => 10, Level::Error->value => 5]);
 *
 *   $log->pushHandler($overflow);
 *```
 *
 * @author Kris Buist <krisbuist@gmail.com>
 */
class OverflowHandler extends AbstractHandler implements FormattableHandlerInterface
{
    private HandlerInterface $handler;

/** @var array<int, int> */
    private array $thresholdMap = [];

/**
     * Buffer of all messages passed to the handler before the threshold was reached
     *
     * @var mixed[][]
     */
    private array $buffer = [];

/**
     * @param array<int, int> $thresholdMap Dictionary of log level value => threshold
     */
    public function __construct(
        HandlerInterface $handler,
        array $thresholdMap = [],
        $level = Level::Debug,
        bool $bubble = true
    ) {
        $this->handler = $handler;
        foreach ($thresholdMap as $thresholdLevel => $threshold) {
            $this->thresholdMap[$thresholdLevel] = $threshold;
        }
        parent::__construct($level, $bubble);
    }

/**
     * Handles a record.
     *
     * All records may be passed to this method, and the handler should discard
     * those that it does not want to handle.
     *
     * The return value of this function controls the bubbling process of the handler stack.
     * Unless the bubbling is interrupted (by returning true), the Logger class will keep on
     * calling further handlers in the stack with a given log record.
     *
     * @inheritDoc
     */
    public function handle(LogRecord $record): bool
    {
        if ($record->level->isLowerThan($this->level)) {
            return false;
        }

$level = $record->level->value;

if (!isset($this->thresholdMap[$level])) {
            $this->thresholdMap[$level] = 0;
        }

if ($this->thresholdMap[$level] > 0) {
            // The overflow threshold is not yet reached, so we're buffering the record and lowering the threshold by 1
            $this->thresholdMap[$level]--;
            $this->buffer[$level][] = $record;

return false === $this->bubble;
        }

if ($this->thresholdMap[$level] === 0) {
            // This current message is breaking the threshold. Flush the buffer and continue handling the current record
            foreach ($this->buffer[$level] ?? [] as $buffered) {
                $this->handler->handle($buffered);
            }
            $this->thresholdMap[$level]--;
            unset($this->buffer[$level]);
        }

$this->handler->handle($record);

return false === $this->bubble;
    }

/**
     * @inheritDoc
     */
    public function setFormatter(FormatterInterface $formatter): HandlerInterface
    {
        if ($this->handler instanceof FormattableHandlerInterface) {
            $this->handler->setFormatter($formatter);

return $this;
        }

throw new \UnexpectedValueException('The nested handler of type '.\get_class($this->handler).' does not support formatters.');
    }

/**
     * @inheritDoc
     */
    public function getFormatter(): FormatterInterface
    {
        if ($this->handler instanceof FormattableHandlerInterface) {
            return $this->handler->getFormatter();
        }

throw new \UnexpectedValueException('The nested handler of type '.\get_class($this->handler).' does not support formatters.');
    }
}

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