<?php

namespace Monolog\Handler;

use Monolog\Logger;
use Rollbar\RollbarLogger;
use Throwable;

/**
 * Sends errors to Rollbar
 *
 * If the context data contains a `payload` key, that is used as an array
 * of payload options to RollbarLogger's log method.
 *
 * Rollbar's context info will contain the context + extra keys from the log record
 * merged, and then on top of that a few keys:
 *
 *  - level (rollbar level name)
 *  - monolog_level (monolog level name, raw level, as rollbar only has 5 but monolog 8)
 *  - channel
 *  - datetime (unix timestamp)
 *
 * @author Paul Statezny <paulstatezny@gmail.com>
 */
class RollbarHandler extends AbstractProcessingHandler
{
    /** @var RollbarLogger */
    protected $rollbarLogger;

    /** @var string[] */
    protected $levelMap = [
        Logger::DEBUG     => 'debug',
        Logger::INFO      => 'info',
        Logger::NOTICE    => 'info',
        Logger::WARNING   => 'warning',
        Logger::ERROR     => 'error',
        Logger::CRITICAL  => 'critical',
        Logger::ALERT     => 'critical',
        Logger::EMERGENCY => 'critical',
    ];

    /**
     * Records whether any log records have been added since the last flush of the rollbar notifier
     *
     * @var bool
     */
    private $hasRecords = false;

    /** @var bool */
    protected $initialized = false;

    /**
     * @param RollbarLogger $rollbarLogger RollbarLogger object constructed with valid token
     */
    public function __construct(RollbarLogger $rollbarLogger, $level = Logger::ERROR, bool $bubble = true)
    {
        $this->rollbarLogger = $rollbarLogger;

        parent::__construct($level, $bubble);
    }

    /**
     * {@inheritDoc}
     */
    protected function write(array $record): void
    {
        if (!$this->initialized) {
            // __destructor() doesn't get called on Fatal errors
            register_shutdown_function(array($this, 'close'));
            $this->initialized = true;
        }

        $context = $record['context'];
        $context = array_merge($context, $record['extra'], [
            'level' => $this->levelMap[$record['level']],
            'monolog_level' => $record['level_name'],
            'channel' => $record['channel'],
            'datetime' => $record['datetime']->format('U'),
        ]);

        if (isset($context['exception']) && $context['exception'] instanceof Throwable) {
            $exception = $context['exception'];
            unset($context['exception']);
            $toLog = $exception;
        } else {
            $toLog = $record['message'];
        }

        // @phpstan-ignore-next-line
        $this->rollbarLogger->log($context['level'], $toLog, $context);

        $this->hasRecords = true;
    }

    public function flush(): void
    {
        if ($this->hasRecords) {
            $this->rollbarLogger->flush();
            $this->hasRecords = false;
        }
    }

    /**
     * {@inheritDoc}
     */
    public function close(): void
    {
        $this->flush();
    }

    /**
     * {@inheritDoc}
     */
    public function reset()
    {
        $this->flush();

        parent::reset();
    }
}
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