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Runner.php

<?php
/*
 * Copyright 2014 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

namespace Google\Task;

use Google\Service\Exception as GoogleServiceException;
use Google\Task\Exception as GoogleTaskException;

/**
 * A task runner with exponential backoff support.
 *
 * @see https://developers.google.com/drive/web/handle-errors#implementing_exponential_backoff
 */
class Runner
{
    const TASK_RETRY_NEVER = 0;
    const TASK_RETRY_ONCE = 1;
    const TASK_RETRY_ALWAYS = -1;

/**
     * @var integer $maxDelay The max time (in seconds) to wait before a retry.
     */
    private $maxDelay = 60;

/**
     * @var integer $delay The previous delay from which the next is calculated.
     */
    private $delay = 1;

/**
     * @var integer $factor The base number for the exponential back off.
     */
    private $factor = 2;

/**
     * @var float $jitter A random number between -$jitter and $jitter will be
     * added to $factor on each iteration to allow for a better distribution of
     * retries.
     */
    private $jitter = 0.5;

/**
     * @var integer $attempts The number of attempts that have been tried so far.
     */
    private $attempts = 0;

/**
     * @var integer $maxAttempts The max number of attempts allowed.
     */
    private $maxAttempts = 1;

/**
     * @var callable $action The task to run and possibly retry.
     */
    private $action;

/**
     * @var array $arguments The task arguments.
     */
    private $arguments;

/**
     * @var array $retryMap Map of errors with retry counts.
     */
    protected $retryMap = [
        '500' => self::TASK_RETRY_ALWAYS,
        '503' => self::TASK_RETRY_ALWAYS,
        'rateLimitExceeded' => self::TASK_RETRY_ALWAYS,
        'userRateLimitExceeded' => self::TASK_RETRY_ALWAYS,
        6  => self::TASK_RETRY_ALWAYS,  // CURLE_COULDNT_RESOLVE_HOST
        7  => self::TASK_RETRY_ALWAYS,  // CURLE_COULDNT_CONNECT
        28 => self::TASK_RETRY_ALWAYS,  // CURLE_OPERATION_TIMEOUTED
        35 => self::TASK_RETRY_ALWAYS,  // CURLE_SSL_CONNECT_ERROR
        52 => self::TASK_RETRY_ALWAYS,  // CURLE_GOT_NOTHING
        'lighthouseError' => self::TASK_RETRY_NEVER
    ];

/**
     * Creates a new task runner with exponential backoff support.
     *
     * @param array $config The task runner config
     * @param string $name The name of the current task (used for logging)
     * @param callable $action The task to run and possibly retry
     * @param array $arguments The task arguments
     * @throws \Google\Task\Exception when misconfigured
     */
    // @phpstan-ignore-next-line
    public function __construct(
        $config,
        $name,
        $action,
        array $arguments = []
    ) {
        if (isset($config['initial_delay'])) {
            if ($config['initial_delay'] < 0) {
                throw new GoogleTaskException(
                    'Task configuration `initial_delay` must not be negative.'
                );
            }

$this->delay = $config['initial_delay'];
        }

if (isset($config['max_delay'])) {
            if ($config['max_delay'] <= 0) {
                throw new GoogleTaskException(
                    'Task configuration `max_delay` must be greater than 0.'
                );
            }

$this->maxDelay = $config['max_delay'];
        }

if (isset($config['factor'])) {
            if ($config['factor'] <= 0) {
                throw new GoogleTaskException(
                    'Task configuration `factor` must be greater than 0.'
                );
            }

$this->factor = $config['factor'];
        }

if (isset($config['jitter'])) {
            if ($config['jitter'] <= 0) {
                throw new GoogleTaskException(
                    'Task configuration `jitter` must be greater than 0.'
                );
            }

$this->jitter = $config['jitter'];
        }

if (isset($config['retries'])) {
            if ($config['retries'] < 0) {
                throw new GoogleTaskException(
                    'Task configuration `retries` must not be negative.'
                );
            }
            $this->maxAttempts += $config['retries'];
        }

if (!is_callable($action)) {
            throw new GoogleTaskException(
                'Task argument `$action` must be a valid callable.'
            );
        }

$this->action = $action;
        $this->arguments = $arguments;
    }

/**
     * Checks if a retry can be attempted.
     *
     * @return boolean
     */
    public function canAttempt()
    {
        return $this->attempts < $this->maxAttempts;
    }

/**
     * Runs the task and (if applicable) automatically retries when errors occur.
     *
     * @return mixed
     * @throws \Google\Service\Exception on failure when no retries are available.
     */
    public function run()
    {
        while ($this->attempt()) {
            try {
                return call_user_func_array($this->action, $this->arguments);
            } catch (GoogleServiceException $exception) {
                $allowedRetries = $this->allowedRetries(
                    $exception->getCode(),
                    $exception->getErrors()
                );

if (!$this->canAttempt() || !$allowedRetries) {
                    throw $exception;
                }

if ($allowedRetries > 0) {
                    $this->maxAttempts = min(
                        $this->maxAttempts,
                        $this->attempts + $allowedRetries
                    );
                }
            }
        }
    }

/**
     * Runs a task once, if possible. This is useful for bypassing the `run()`
     * loop.
     *
     * NOTE: If this is not the first attempt, this function will sleep in
     * accordance to the backoff configurations before running the task.
     *
     * @return boolean
     */
    public function attempt()
    {
        if (!$this->canAttempt()) {
            return false;
        }

if ($this->attempts > 0) {
            $this->backOff();
        }

$this->attempts++;

return true;
    }

/**
     * Sleeps in accordance to the backoff configurations.
     */
    private function backOff()
    {
        $delay = $this->getDelay();

usleep((int) ($delay * 1000000));
    }

/**
     * Gets the delay (in seconds) for the current backoff period.
     *
     * @return int
     */
    private function getDelay()
    {
        $jitter = $this->getJitter();
        $factor = $this->attempts > 1 ? $this->factor + $jitter : 1 + abs($jitter);

return $this->delay = min($this->maxDelay, $this->delay * $factor);
    }

/**
     * Gets the current jitter (random number between -$this->jitter and
     * $this->jitter).
     *
     * @return float
     */
    private function getJitter()
    {
        return $this->jitter * 2 * mt_rand() / mt_getrandmax() - $this->jitter;
    }

/**
     * Gets the number of times the associated task can be retried.
     *
     * NOTE: -1 is returned if the task can be retried indefinitely
     *
     * @return integer
     */
    public function allowedRetries($code, $errors = [])
    {
        if (isset($this->retryMap[$code])) {
            return $this->retryMap[$code];
        }

if (
            !empty($errors) &&
            isset($errors[0]['reason'], $this->retryMap[$errors[0]['reason']])
        ) {
            return $this->retryMap[$errors[0]['reason']];
        }

return 0;
    }

public function setRetryMap($retryMap)
    {
        $this->retryMap = $retryMap;
    }
}

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	dataewom/dataewom	0755	2023-12-23 08:39:39
..	dir	-	dataewom/dataewom	0755	2023-12-23 08:39:39
Composer.php	text/x-php	3.68 KB	dataewom/dataewom	0644	2023-04-07 12:29:48
Exception.php	text/x-php	712 B	dataewom/dataewom	0644	2023-04-07 12:29:48
Retryable.php	text/x-php	751 B	dataewom/dataewom	0644	2023-04-07 12:29:48
Runner.php	text/x-php	8.03 KB	dataewom/dataewom	0644	2023-04-07 12:29:48

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