php-beanstalkd消息队列类分享

<?php
namespace Common\Business;
/**
 * beanstalk: A minimalistic PHP beanstalk client.
 *
 * Copyright (c) 2009-2015 David Persson
 *
 * Distributed under the terms of the MIT License.
 * Redistributions of files must retain the above copyright notice.
 */

use RuntimeException;

/**
 * An interface to the beanstalk queue service. Implements the beanstalk
 * protocol spec 1.9. Where appropriate the documentation from the protocol
 * has been added to the docblocks in this class.
 *
 * @link https://github.com/kr/beanstalkd/blob/master/doc/protocol.txt
 */
class BeanStalk {

	/**
	 * Minimum priority value which can be assigned to a job. The minimum
	 * priority value is also the _highest priority_ a job can have.
	 *
	 * @var integer
	 */
	const MIN_PRIORITY = 0;

	/**
	 * Maximum priority value which can be assigned to a job. The maximum
	 * priority value is also the _lowest priority_ a job can have.
	 *
	 * @var integer
	 */
	const MAX_PRIORITY = 4294967295;

	/**
	 * Holds a boolean indicating whether a connection to the server is
	 * currently established or not.
	 *
	 * @var boolean
	 */
	public $connected = false;

	/**
	 * Holds configuration values.
	 *
	 * @var array
	 */
	protected $_config = [];

	/**
	 * The current connection resource handle (if any).
	 *
	 * @var resource
	 */
	protected $_connection;

	/**
	 * Constructor.
	 *
	 * @param array $config An array of configuration values:
	 *        - `‘persistent‘`  Whether to make the connection persistent or
	 *                          not, defaults to `true` as the FAQ recommends
	 *                          persistent connections.
	 *        - `‘host‘`        The beanstalk server hostname or IP address to
	 *                          connect to, defaults to `127.0.0.1`.
	 *        - `‘port‘`        The port of the server to connect to, defaults
	 *                          to `11300`.
	 *        - `‘timeout‘`     Timeout in seconds when establishing the
	 *                          connection, defaults to `1`.
	 *        - `‘logger‘`      An instance of a PSR-3 compatible logger.
	 *
	 * @link https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-3-logger-interface.md
	 * @return void
	 */
	public function __construct(array $config = []) {
		$defaults = [
			‘persistent‘ => true,
			‘host‘ => ‘127.0.0.1‘,
			‘port‘ => 11300,
			‘timeout‘ => 1,
			‘logger‘ => null
		];
		$this->_config = $config + $defaults;
	}

	/**
	 * Destructor, disconnects from the server.
	 *
	 * @return void
	 */
	public function __destruct() {
		$this->disconnect();
	}

	/**
	 * Initiates a socket connection to the beanstalk server. The resulting
	 * stream will not have any timeout set on it. Which means it can wait
	 * an unlimited amount of time until a packet becomes available. This
	 * is required for doing blocking reads.
	 *
	 * @see \Beanstalk\Client::$_connection
	 * @see \Beanstalk\Client::reserve()
	 * @return boolean `true` if the connection was established, `false` otherwise.
	 */
	public function connect() {
		if (isset($this->_connection)) {
			$this->disconnect();
		}
        $errNum = ‘‘;
        $errStr = ‘‘;
		$function = $this->_config[‘persistent‘] ? ‘pfsockopen‘ : ‘fsockopen‘;
		$params = [$this->_config[‘host‘], $this->_config[‘port‘], &$errNum, &$errStr];

		if ($this->_config[‘timeout‘]) {
			$params[] = $this->_config[‘timeout‘];
		}
		$this->_connection = @call_user_func_array($function, $params);

		if (!empty($errNum) || !empty($errStr)) {
			$this->_error("{$errNum}: {$errStr}");
		}

		$this->connected = is_resource($this->_connection);

		if ($this->connected) {
			stream_set_timeout($this->_connection, -1);
		}
		return $this->connected;
	}

	/**
	 * Closes the connection to the beanstalk server by first signaling
	 * that we want to quit then actually closing the socket connection.
	 *
	 * @return boolean `true` if diconnecting was successful.
	 */
	public function disconnect() {
		if (!is_resource($this->_connection)) {
			$this->connected = false;
		} else {
			$this->_write(‘quit‘);
			$this->connected = !fclose($this->_connection);

			if (!$this->connected) {
				$this->_connection = null;
			}
		}
		return !$this->connected;
	}

	/**
	 * Pushes an error message to the logger, when one is configured.
	 *
	 * @param string $message The error message.
	 * @return void
	 */
	protected function _error($message) {
		if ($this->_config[‘logger‘]) {
			$this->_config[‘logger‘]->error($message);
		}
	}

	public function errors()
	{
		return $this->_config[‘logger‘];
	}
	/**
	 * Writes a packet to the socket. Prior to writing to the socket will
	 * check for availability of the connection.
	 *
	 * @param string $data
	 * @return integer|boolean number of written bytes or `false` on error.
	 */
	protected function _write($data) {
		if (!$this->connected) {
			$message = ‘No connecting found while writing data to socket.‘;
			throw new RuntimeException($message);
		}

		$data .= "\r\n";
		return fwrite($this->_connection, $data, strlen($data));
	}

	/**
	 * Reads a packet from the socket. Prior to reading from the socket
	 * will check for availability of the connection.
	 *
	 * @param integer $length Number of bytes to read.
	 * @return string|boolean Data or `false` on error.
	 */
	protected function _read($length = null) {
		if (!$this->connected) {
			$message = ‘No connection found while reading data from socket.‘;
			throw new RuntimeException($message);
		}
		if ($length) {
			if (feof($this->_connection)) {
				return false;
			}
			$data = stream_get_contents($this->_connection, $length + 2);
			$meta = stream_get_meta_data($this->_connection);

			if ($meta[‘timed_out‘]) {
				$message = ‘Connection timed out while reading data from socket.‘;
				throw new RuntimeException($message);
			}
			$packet = rtrim($data, "\r\n");
		} else {
			$packet = stream_get_line($this->_connection, 16384, "\r\n");
		}
		return $packet;
	}

	/* Producer Commands */

	/**
	 * The `put` command is for any process that wants to insert a job into the queue.
	 *
	 * @param integer $pri Jobs with smaller priority values will be scheduled
	 *        before jobs with larger priorities. The most urgent priority is
	 *        0; the least urgent priority is 4294967295.
	 * @param integer $delay Seconds to wait before putting the job in the
	 *        ready queue.  The job will be in the "delayed" state during this time.
	 * @param integer $ttr Time to run - Number of seconds to allow a worker to
	 *        run this job.  The minimum ttr is 1.
	 * @param string $data The job body.
	 * @return integer|boolean `false` on error otherwise an integer indicating
	 *         the job id.
	 */
	public function put($pri, $delay, $ttr, $data) {
		$this->_write(sprintf("put %d %d %d %d\r\n%s", $pri, $delay, $ttr, strlen($data), $data));
		$status = strtok($this->_read(), ‘ ‘);

		switch ($status) {
			case ‘INSERTED‘:
			case ‘BURIED‘:
				return (integer) strtok(‘ ‘); // job id
			case ‘EXPECTED_CRLF‘:
			case ‘JOB_TOO_BIG‘:
			default:
				$this->_error($status);
				return false;
		}
	}

	/**
	 * The `use` command is for producers. Subsequent put commands will put
	 * jobs into the tube specified by this command. If no use command has
	 * been issued, jobs will be put into the tube named `default`.
	 *
	 * @param string $tube A name at most 200 bytes. It specifies the tube to
	 *        use. If the tube does not exist, it will be created.
	 * @return string|boolean `false` on error otherwise the name of the tube.
	 */
	public function useTube($tube) {
		$this->_write(sprintf(‘use %s‘, $tube));
		$status = strtok($this->_read(), ‘ ‘);

		switch ($status) {
			case ‘USING‘:
				return strtok(‘ ‘);
			default:
				$this->_error($status);
				return false;
		}
	}

	/**
	 * Pause a tube delaying any new job in it being reserved for a given time.
	 *
	 * @param string $tube The name of the tube to pause.
	 * @param integer $delay Number of seconds to wait before reserving any more
	 *        jobs from the queue.
	 * @return boolean `false` on error otherwise `true`.
	 */
	public function pauseTube($tube, $delay) {
		$this->_write(sprintf(‘pause-tube %s %d‘, $tube, $delay));
		$status = strtok($this->_read(), ‘ ‘);

		switch ($status) {
			case ‘PAUSED‘:
				return true;
			case ‘NOT_FOUND‘:
			default:
				$this->_error($status);
				return false;
		}
	}

	/* Worker Commands */

	/**
	 * Reserve a job (with a timeout).
	 *
	 * @param integer $timeout If given specifies number of seconds to wait for
	 *        a job. `0` returns immediately.
	 * @return array|false `false` on error otherwise an array holding job id
	 *         and body.
	 */
	public function reserve($timeout = null) {
		if (isset($timeout)) {
			$this->_write(sprintf(‘reserve-with-timeout %d‘, $timeout));
		} else {
			$this->_write(‘reserve‘);
		}
		$status = strtok($this->_read(), ‘ ‘);

		switch ($status) {
			case ‘RESERVED‘:
				return [
					‘id‘ => (integer) strtok(‘ ‘),
					‘body‘ => $this->_read((integer) strtok(‘ ‘))
				];
			case ‘DEADLINE_SOON‘:
			case ‘TIMED_OUT‘:
			default:
				$this->_error($status);
				return false;
		}
	}

	/**
	 * Removes a job from the server entirely.
	 *
	 * @param integer $id The id of the job.
	 * @return boolean `false` on error, `true` on success.
	 */
	public function delete($id) {
		$this->_write(sprintf(‘delete %d‘, $id));
		$status = $this->_read();

		switch ($status) {
			case ‘DELETED‘:
				return true;
			case ‘NOT_FOUND‘:
			default:
				$this->_error($status);
				return false;
		}
	}

	/**
	 * Puts a reserved job back into the ready queue.
	 *
	 * @param integer $id The id of the job.
	 * @param integer $pri Priority to assign to the job.
	 * @param integer $delay Number of seconds to wait before putting the job in the ready queue.
	 * @return boolean `false` on error, `true` on success.
	 */
	public function release($id, $pri, $delay) {
		$this->_write(sprintf(‘release %d %d %d‘, $id, $pri, $delay));
		$status = $this->_read();

		switch ($status) {
			case ‘RELEASED‘:
			case ‘BURIED‘:
				return true;
			case ‘NOT_FOUND‘:
			default:
				$this->_error($status);
				return false;
		}
	}

	/**
	 * Puts a job into the `buried` state Buried jobs are put into a FIFO
	 * linked list and will not be touched until a client kicks them.
	 *
	 * @param integer $id The id of the job.
	 * @param integer $pri *New* priority to assign to the job.
	 * @return boolean `false` on error, `true` on success.
	 */
	public function bury($id, $pri) {
		$this->_write(sprintf(‘bury %d %d‘, $id, $pri));
		$status = $this->_read();

		switch ($status) {
			case ‘BURIED‘:
				return true;
			case ‘NOT_FOUND‘:
			default:
				$this->_error($status);
				return false;
		}
	}

	/**
	 * Allows a worker to request more time to work on a job.
	 *
	 * @param integer $id The id of the job.
	 * @return boolean `false` on error, `true` on success.
	 */
	public function touch($id) {
		$this->_write(sprintf(‘touch %d‘, $id));
		$status = $this->_read();

		switch ($status) {
			case ‘TOUCHED‘:
				return true;
			case ‘NOT_TOUCHED‘:
			default:
				$this->_error($status);
				return false;
		}
	}

	/**
	 * Adds the named tube to the watch list for the current connection.
	 *
	 * @param string $tube Name of tube to watch.
	 * @return integer|boolean `false` on error otherwise number of tubes in watch list.
	 */
	public function watch($tube) {
		$this->_write(sprintf(‘watch %s‘, $tube));
		$status = strtok($this->_read(), ‘ ‘);

		switch ($status) {
			case ‘WATCHING‘:
				return (integer) strtok(‘ ‘);
			default:
				$this->_error($status);
				return false;
		}
	}

	/**
	 * Remove the named tube from the watch list.
	 *
	 * @param string $tube Name of tube to ignore.
	 * @return integer|boolean `false` on error otherwise number of tubes in watch list.
	 */
	public function ignore($tube) {
		$this->_write(sprintf(‘ignore %s‘, $tube));
		$status = strtok($this->_read(), ‘ ‘);

		switch ($status) {
			case ‘WATCHING‘:
				return (integer) strtok(‘ ‘);
			case ‘NOT_IGNORED‘:
			default:
				$this->_error($status);
				return false;
		}
	}

	/* Other Commands */

	/**
	 * Inspect a job by its id.
	 *
	 * @param integer $id The id of the job.
	 * @return string|boolean `false` on error otherwise the body of the job.
	 */
	public function peek($id) {
		$this->_write(sprintf(‘peek %d‘, $id));
		return $this->_peekRead();
	}

	/**
	 * Inspect the next ready job.
	 *
	 * @return string|boolean `false` on error otherwise the body of the job.
	 */
	public function peekReady() {
		$this->_write(‘peek-ready‘);
		return $this->_peekRead();
	}

	/**
	 * Inspect the job with the shortest delay left.
	 *
	 * @return string|boolean `false` on error otherwise the body of the job.
	 */
	public function peekDelayed() {
		$this->_write(‘peek-delayed‘);
		return $this->_peekRead();
	}

	/**
	 * Inspect the next job in the list of buried jobs.
	 *
	 * @return string|boolean `false` on error otherwise the body of the job.
	 */
	public function peekBuried() {
		$this->_write(‘peek-buried‘);
		return $this->_peekRead();
	}

	/**
	 * Handles response for all peek methods.
	 *
	 * @return string|boolean `false` on error otherwise the body of the job.
	 */
	protected function _peekRead() {
		$status = strtok($this->_read(), ‘ ‘);

		switch ($status) {
			case ‘FOUND‘:
				return [
					‘id‘ => (integer) strtok(‘ ‘),
					‘body‘ => $this->_read((integer) strtok(‘ ‘))
				];
			case ‘NOT_FOUND‘:
			default:
				$this->_error($status);
				return false;
		}
	}

	/**
	 * Moves jobs into the ready queue (applies to the current tube).
	 *
	 * If there are buried jobs those get kicked only otherwise delayed
	 * jobs get kicked.
	 *
	 * @param integer $bound Upper bound on the number of jobs to kick.
	 * @return integer|boolean False on error otherwise number of jobs kicked.
	 */
	public function kick($bound) {
		$this->_write(sprintf(‘kick %d‘, $bound));
		$status = strtok($this->_read(), ‘ ‘);

		switch ($status) {
			case ‘KICKED‘:
				return (integer) strtok(‘ ‘);
			default:
				$this->_error($status);
				return false;
		}
	}

	/**
	 * This is a variant of the kick command that operates with a single
	 * job identified by its job id. If the given job id exists and is in a
	 * buried or delayed state, it will be moved to the ready queue of the
	 * the same tube where it currently belongs.
	 *
	 * @param integer $id The job id.
	 * @return boolean `false` on error `true` otherwise.
	 */
	public function kickJob($id) {
		$this->_write(sprintf(‘kick-job %d‘, $id));
		$status = strtok($this->_read(), ‘ ‘);

		switch ($status) {
			case ‘KICKED‘:
				return true;
			case ‘NOT_FOUND‘:
			default:
				$this->_error($status);
				return false;
		}
	}

	/* Stats Commands */

	/**
	 * Gives statistical information about the specified job if it exists.
	 *
	 * @param integer $id The job id.
	 * @return string|boolean `false` on error otherwise a string with a yaml formatted dictionary.
	 */
	public function statsJob($id) {
		$this->_write(sprintf(‘stats-job %d‘, $id));
		return $this->_statsRead();
	}

	/**
	 * Gives statistical information about the specified tube if it exists.
	 *
	 * @param string $tube Name of the tube.
	 * @return string|boolean `false` on error otherwise a string with a yaml formatted dictionary.
	 */
	public function statsTube($tube) {
		$this->_write(sprintf(‘stats-tube %s‘, $tube));
		return $this->_statsRead();
	}

	/**
	 * Gives statistical information about the system as a whole.
	 *
	 * @return string|boolean `false` on error otherwise a string with a yaml formatted dictionary.
	 */
	public function stats() {
		$this->_write(‘stats‘);
		return $this->_statsRead();
	}

	/**
	 * Returns a list of all existing tubes.
	 *
	 * @return string|boolean `false` on error otherwise a string with a yaml formatted list.
	 */
	public function listTubes() {
		$this->_write(‘list-tubes‘);
		return $this->_statsRead();
	}

	/**
	 * Returns the tube currently being used by the producer.
	 *
	 * @return string|boolean `false` on error otherwise a string with the name of the tube.
	 */
	public function listTubeUsed() {
		$this->_write(‘list-tube-used‘);
		$status = strtok($this->_read(), ‘ ‘);

		switch ($status) {
			case ‘USING‘:
				return strtok(‘ ‘);
			default:
				$this->_error($status);
				return false;
		}
	}

	/**
	 * Returns a list of tubes currently being watched by the worker.
	 *
	 * @return string|boolean `false` on error otherwise a string with a yaml formatted list.
	 */
	public function listTubesWatched() {
		$this->_write(‘list-tubes-watched‘);
		return $this->_statsRead();
	}

	/**
	 * Handles responses for all stat methods.
	 *
	 * @param boolean $decode Whether to decode data before returning it or not. Default is `true`.
	 * @return array|string|boolean `false` on error otherwise statistical data.
	 */
	protected function _statsRead($decode = true) {
		$status = strtok($this->_read(), ‘ ‘);

		switch ($status) {
			case ‘OK‘:
				$data = $this->_read((integer) strtok(‘ ‘));
				return $decode ? $this->_decode($data) : $data;
			default:
				$this->_error($status);
				return false;
		}
	}

	/**
	 * Decodes YAML data. This is a super naive decoder which just works on
	 * a subset of YAML which is commonly returned by beanstalk.
	 *
	 * @param string $data The data in YAML format, can be either a list or a dictionary.
	 * @return array An (associative) array of the converted data.
	 */
	protected function _decode($data) {
		$data = array_slice(explode("\n", $data), 1);
		$result = [];

		foreach ($data as $key => $value) {
			if ($value[0] === ‘-‘) {
				$value = ltrim($value, ‘- ‘);
			} elseif (strpos($value, ‘:‘) !== false) {
				list($key, $value) = explode(‘:‘, $value);
				$value = ltrim($value, ‘ ‘);
			}
			if (is_numeric($value)) {
				$value = (integer) $value == $value ? (integer) $value : (float) $value;
			}
			$result[$key] = $value;
		}
		return $result;
	}
}

?>