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class-wc-eval-math.php000064400000032221151542601540010650 0ustar00<?php

use Automattic\Jetpack\Constants;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

if ( ! class_exists( 'WC_Eval_Math', false ) ) {
	/**
	 * Class WC_Eval_Math. Supports basic math only (removed eval function).
	 *
	 * Based on EvalMath by Miles Kaufman Copyright (C) 2005 Miles Kaufmann http://www.twmagic.com/.
	 */
	class WC_Eval_Math {

		/**
		 * Last error.
		 *
		 * @var string
		 */
		public static $last_error = null;

		/**
		 * Variables (and constants).
		 *
		 * @var array
		 */
		public static $v = array( 'e' => 2.71, 'pi' => 3.14 );

		/**
		 * User-defined functions.
		 *
		 * @var array
		 */
		public static $f = array();

		/**
		 * Constants.
		 *
		 * @var array
		 */
		public static $vb = array( 'e', 'pi' );

		/**
		 * Built-in functions.
		 *
		 * @var array
		 */
		public static $fb = array();

		/**
		 * Evaluate maths string.
		 *
		 * @param string  $expr
		 * @return mixed
		 */
		public static function evaluate( $expr ) {
			self::$last_error = null;
			$expr = trim( $expr );
			if ( substr( $expr, -1, 1 ) == ';' ) {
				$expr = substr( $expr, 0, strlen( $expr ) -1 ); // strip semicolons at the end
			}
			// ===============
			// is it a variable assignment?
			if ( preg_match( '/^\s*([a-z]\w*)\s*=\s*(.+)$/', $expr, $matches ) ) {
				if ( in_array( $matches[1], self::$vb ) ) { // make sure we're not assigning to a constant
					return self::trigger( "cannot assign to constant '$matches[1]'" );
				}
				if ( ( $tmp = self::pfx( self::nfx( $matches[2] ) ) ) === false ) {
					return false; // get the result and make sure it's good
				}
				self::$v[ $matches[1] ] = $tmp; // if so, stick it in the variable array
				return self::$v[ $matches[1] ]; // and return the resulting value
				// ===============
				// is it a function assignment?
			} elseif ( preg_match( '/^\s*([a-z]\w*)\s*\(\s*([a-z]\w*(?:\s*,\s*[a-z]\w*)*)\s*\)\s*=\s*(.+)$/', $expr, $matches ) ) {
				$fnn = $matches[1]; // get the function name
				if ( in_array( $matches[1], self::$fb ) ) { // make sure it isn't built in
					return self::trigger( "cannot redefine built-in function '$matches[1]()'" );
				}
				$args = explode( ",", preg_replace( "/\s+/", "", $matches[2] ) ); // get the arguments
				if ( ( $stack = self::nfx( $matches[3] ) ) === false ) {
					return false; // see if it can be converted to postfix
				}
				$stack_size = count( $stack );
				for ( $i = 0; $i < $stack_size; $i++ ) { // freeze the state of the non-argument variables
					$token = $stack[ $i ];
					if ( preg_match( '/^[a-z]\w*$/', $token ) and ! in_array( $token, $args ) ) {
						if ( array_key_exists( $token, self::$v ) ) {
							$stack[ $i ] = self::$v[ $token ];
						} else {
							return self::trigger( "undefined variable '$token' in function definition" );
						}
					}
				}
				self::$f[ $fnn ] = array( 'args' => $args, 'func' => $stack );
				return true;
				// ===============
			} else {
				return self::pfx( self::nfx( $expr ) ); // straight up evaluation, woo
			}
		}

		/**
		 * Convert infix to postfix notation.
		 *
		 * @param  string $expr
		 *
		 * @return array|string
		 */
		private static function nfx( $expr ) {

			$index = 0;
			$stack = new WC_Eval_Math_Stack;
			$output = array(); // postfix form of expression, to be passed to pfx()
			$expr = trim( $expr );

			$ops   = array( '+', '-', '*', '/', '^', '_' );
			$ops_r = array( '+' => 0, '-' => 0, '*' => 0, '/' => 0, '^' => 1 ); // right-associative operator?
			$ops_p = array( '+' => 0, '-' => 0, '*' => 1, '/' => 1, '_' => 1, '^' => 2 ); // operator precedence

			$expecting_op = false; // we use this in syntax-checking the expression
			// and determining when a - is a negation
			if ( preg_match( "/[^\w\s+*^\/()\.,-]/", $expr, $matches ) ) { // make sure the characters are all good
				return self::trigger( "illegal character '{$matches[0]}'" );
			}

			while ( 1 ) { // 1 Infinite Loop ;)
				$op = substr( $expr, $index, 1 ); // get the first character at the current index
				// find out if we're currently at the beginning of a number/variable/function/parenthesis/operand
				$ex = preg_match( '/^([A-Za-z]\w*\(?|\d+(?:\.\d*)?|\.\d+|\()/', substr( $expr, $index ), $match );
				// ===============
				if ( '-' === $op and ! $expecting_op ) { // is it a negation instead of a minus?
					$stack->push( '_' ); // put a negation on the stack
					$index++;
				} elseif ( '_' === $op ) { // we have to explicitly deny this, because it's legal on the stack
					return self::trigger( "illegal character '_'" ); // but not in the input expression
					// ===============
				} elseif ( ( in_array( $op, $ops ) or $ex ) and $expecting_op ) { // are we putting an operator on the stack?
					if ( $ex ) { // are we expecting an operator but have a number/variable/function/opening parenthesis?
						$op = '*';
						$index--; // it's an implicit multiplication
					}
					// heart of the algorithm:
					while ( $stack->count > 0 and ( $o2 = $stack->last() ) and in_array( $o2, $ops ) and ( $ops_r[ $op ] ? $ops_p[ $op ] < $ops_p[ $o2 ] : $ops_p[ $op ] <= $ops_p[ $o2 ] ) ) {
						$output[] = $stack->pop(); // pop stuff off the stack into the output
					}
					// many thanks: https://en.wikipedia.org/wiki/Reverse_Polish_notation#The_algorithm_in_detail
					$stack->push( $op ); // finally put OUR operator onto the stack
					$index++;
					$expecting_op = false;
					// ===============
				} elseif ( ')' === $op && $expecting_op ) { // ready to close a parenthesis?
					while ( ( $o2 = $stack->pop() ) != '(' ) { // pop off the stack back to the last (
						if ( is_null( $o2 ) ) {
							return self::trigger( "unexpected ')'" );
						} else {
							$output[] = $o2;
						}
					}
					if ( preg_match( "/^([A-Za-z]\w*)\($/", $stack->last( 2 ), $matches ) ) { // did we just close a function?
						$fnn = $matches[1]; // get the function name
						$arg_count = $stack->pop(); // see how many arguments there were (cleverly stored on the stack, thank you)
						$output[] = $stack->pop(); // pop the function and push onto the output
						if ( in_array( $fnn, self::$fb ) ) { // check the argument count
							if ( $arg_count > 1 ) {
								return self::trigger( "too many arguments ($arg_count given, 1 expected)" );
							}
						} elseif ( array_key_exists( $fnn, self::$f ) ) {
							if ( count( self::$f[ $fnn ]['args'] ) != $arg_count ) {
								return self::trigger( "wrong number of arguments ($arg_count given, " . count( self::$f[ $fnn ]['args'] ) . " expected)" );
							}
						} else { // did we somehow push a non-function on the stack? this should never happen
							return self::trigger( "internal error" );
						}
					}
					$index++;
					// ===============
				} elseif ( ',' === $op and $expecting_op ) { // did we just finish a function argument?
					while ( ( $o2 = $stack->pop() ) != '(' ) {
						if ( is_null( $o2 ) ) {
							return self::trigger( "unexpected ','" ); // oops, never had a (
						} else {
							$output[] = $o2; // pop the argument expression stuff and push onto the output
						}
					}
					// make sure there was a function
					if ( ! preg_match( "/^([A-Za-z]\w*)\($/", $stack->last( 2 ), $matches ) ) {
						return self::trigger( "unexpected ','" );
					}
					$stack->push( $stack->pop() + 1 ); // increment the argument count
					$stack->push( '(' ); // put the ( back on, we'll need to pop back to it again
					$index++;
					$expecting_op = false;
					// ===============
				} elseif ( '(' === $op and ! $expecting_op ) {
					$stack->push( '(' ); // that was easy
					$index++;
					// ===============
				} elseif ( $ex and ! $expecting_op ) { // do we now have a function/variable/number?
					$expecting_op = true;
					$val = $match[1];
					if ( preg_match( "/^([A-Za-z]\w*)\($/", $val, $matches ) ) { // may be func, or variable w/ implicit multiplication against parentheses...
						if ( in_array( $matches[1], self::$fb ) or array_key_exists( $matches[1], self::$f ) ) { // it's a func
							$stack->push( $val );
							$stack->push( 1 );
							$stack->push( '(' );
							$expecting_op = false;
						} else { // it's a var w/ implicit multiplication
							$val = $matches[1];
							$output[] = $val;
						}
					} else { // it's a plain old var or num
						$output[] = $val;
					}
					$index += strlen( $val );
					// ===============
				} elseif ( ')' === $op ) { // miscellaneous error checking
					return self::trigger( "unexpected ')'" );
				} elseif ( in_array( $op, $ops ) and ! $expecting_op ) {
					return self::trigger( "unexpected operator '$op'" );
				} else { // I don't even want to know what you did to get here
					return self::trigger( "an unexpected error occurred" );
				}
				if ( strlen( $expr ) == $index ) {
					if ( in_array( $op, $ops ) ) { // did we end with an operator? bad.
						return self::trigger( "operator '$op' lacks operand" );
					} else {
						break;
					}
				}
				while ( substr( $expr, $index, 1 ) == ' ' ) { // step the index past whitespace (pretty much turns whitespace
					$index++;                             // into implicit multiplication if no operator is there)
				}
			}
			while ( ! is_null( $op = $stack->pop() ) ) { // pop everything off the stack and push onto output
				if ( '(' === $op ) {
					return self::trigger( "expecting ')'" ); // if there are (s on the stack, ()s were unbalanced
				}
				$output[] = $op;
			}
			return $output;
		}

		/**
		 * Evaluate postfix notation.
		 *
		 * @param  mixed $tokens
		 * @param  array $vars
		 *
		 * @return mixed
		 */
		private static function pfx( $tokens, $vars = array() ) {
			if ( false == $tokens ) {
				return false;
			}
			$stack = new WC_Eval_Math_Stack;

			foreach ( $tokens as $token ) { // nice and easy
				// if the token is a binary operator, pop two values off the stack, do the operation, and push the result back on
				if ( in_array( $token, array( '+', '-', '*', '/', '^' ) ) ) {
					if ( is_null( $op2 = $stack->pop() ) ) {
						return self::trigger( "internal error" );
					}
					if ( is_null( $op1 = $stack->pop() ) ) {
						return self::trigger( "internal error" );
					}
					switch ( $token ) {
						case '+':
							$stack->push( $op1 + $op2 );
							break;
						case '-':
							$stack->push( $op1 - $op2 );
							break;
						case '*':
							$stack->push( $op1 * $op2 );
							break;
						case '/':
							if ( 0 == $op2 ) {
								return self::trigger( 'division by zero' );
							}
							$stack->push( $op1 / $op2 );
							break;
						case '^':
							$stack->push( pow( $op1, $op2 ) );
							break;
					}
					// if the token is a unary operator, pop one value off the stack, do the operation, and push it back on
				} elseif ( '_' === $token ) {
					$stack->push( -1 * $stack->pop() );
					// if the token is a function, pop arguments off the stack, hand them to the function, and push the result back on
				} elseif ( ! preg_match( "/^([a-z]\w*)\($/", $token, $matches ) ) {
					if ( is_numeric( $token ) ) {
						$stack->push( $token );
					} elseif ( array_key_exists( $token, self::$v ) ) {
						$stack->push( self::$v[ $token ] );
					} elseif ( array_key_exists( $token, $vars ) ) {
						$stack->push( $vars[ $token ] );
					} else {
						return self::trigger( "undefined variable '$token'" );
					}
				}
			}
			// when we're out of tokens, the stack should have a single element, the final result
			if ( 1 != $stack->count ) {
				return self::trigger( "internal error" );
			}
			return $stack->pop();
		}

		/**
		 * Trigger an error, but nicely, if need be.
		 *
		 * @param  string $msg
		 *
		 * @return bool
		 */
		private static function trigger( $msg ) {
			self::$last_error = $msg;
			if ( ! Constants::is_true( 'DOING_AJAX' ) && Constants::is_true( 'WP_DEBUG' ) ) {
				echo "\nError found in:";
				self::debugPrintCallingFunction();
				trigger_error( $msg, E_USER_WARNING );
			}
			return false;
		}

		/**
		 * Prints the file name, function name, and
		 * line number which called your function
		 * (not this function, then one that  called
		 * it to begin with)
		 */
		private static function debugPrintCallingFunction() {
			$file = 'n/a';
			$func = 'n/a';
			$line = 'n/a';
			$debugTrace = debug_backtrace();
			if ( isset( $debugTrace[1] ) ) {
				$file = $debugTrace[1]['file'] ? $debugTrace[1]['file'] : 'n/a';
				$line = $debugTrace[1]['line'] ? $debugTrace[1]['line'] : 'n/a';
			}
			if ( isset( $debugTrace[2] ) ) {
				$func = $debugTrace[2]['function'] ? $debugTrace[2]['function'] : 'n/a';
			}
			echo "\n$file, $func, $line\n";
		}
	}

	/**
	 * Class WC_Eval_Math_Stack.
	 */
	class WC_Eval_Math_Stack {

		/**
		 * Stack array.
		 *
		 * @var array
		 */
		public $stack = array();

		/**
		 * Stack counter.
		 *
		 * @var integer
		 */
		public $count = 0;

		/**
		 * Push value into stack.
		 *
		 * @param  mixed $val
		 */
		public function push( $val ) {
			$this->stack[ $this->count ] = $val;
			$this->count++;
		}

		/**
		 * Pop value from stack.
		 *
		 * @return mixed
		 */
		public function pop() {
			if ( $this->count > 0 ) {
				$this->count--;
				return $this->stack[ $this->count ];
			}
			return null;
		}

		/**
		 * Get last value from stack.
		 *
		 * @param  int $n
		 *
		 * @return mixed
		 */
		public function last( $n=1 ) {
			$key = $this->count - $n;
			return array_key_exists( $key, $this->stack ) ? $this->stack[ $key ] : null;
		}
	}
}
wp-async-request.php000064400000005244151542601540010514 0ustar00<?php
/**
 * WP Async Request
 *
 * @package WP-Background-Processing
 */

defined( 'ABSPATH' ) || exit;

/**
 * Abstract WP_Async_Request class.
 */
abstract class WP_Async_Request {

	/**
	 * Prefix
	 *
	 * (default value: 'wp')
	 *
	 * @var string
	 * @access protected
	 */
	protected $prefix = 'wp';

	/**
	 * Action
	 *
	 * (default value: 'async_request')
	 *
	 * @var string
	 * @access protected
	 */
	protected $action = 'async_request';

	/**
	 * Identifier
	 *
	 * @var mixed
	 * @access protected
	 */
	protected $identifier;

	/**
	 * Data
	 *
	 * (default value: array())
	 *
	 * @var array
	 * @access protected
	 */
	protected $data = array();

	/**
	 * Initiate new async request
	 */
	public function __construct() {
		$this->identifier = $this->prefix . '_' . $this->action;

		add_action( 'wp_ajax_' . $this->identifier, array( $this, 'maybe_handle' ) );
		add_action( 'wp_ajax_nopriv_' . $this->identifier, array( $this, 'maybe_handle' ) );
	}

	/**
	 * Set data used during the request
	 *
	 * @param array $data Data.
	 *
	 * @return $this
	 */
	public function data( $data ) {
		$this->data = $data;

		return $this;
	}

	/**
	 * Dispatch the async request
	 *
	 * @return array|WP_Error
	 */
	public function dispatch() {
		$url  = add_query_arg( $this->get_query_args(), $this->get_query_url() );
		$args = $this->get_post_args();

		return wp_remote_post( esc_url_raw( $url ), $args );
	}

	/**
	 * Get query args
	 *
	 * @return array
	 */
	protected function get_query_args() {
		if ( property_exists( $this, 'query_args' ) ) {
			return $this->query_args;
		}

		return array(
			'action' => $this->identifier,
			'nonce'  => wp_create_nonce( $this->identifier ),
		);
	}

	/**
	 * Get query URL
	 *
	 * @return string
	 */
	protected function get_query_url() {
		if ( property_exists( $this, 'query_url' ) ) {
			return $this->query_url;
		}

		return admin_url( 'admin-ajax.php' );
	}

	/**
	 * Get post args
	 *
	 * @return array
	 */
	protected function get_post_args() {
		if ( property_exists( $this, 'post_args' ) ) {
			return $this->post_args;
		}

		return array(
			'timeout'   => 0.01,
			'blocking'  => false,
			'body'      => $this->data,
			'cookies'   => $_COOKIE,
			'sslverify' => apply_filters( 'https_local_ssl_verify', false ),
		);
	}

	/**
	 * Maybe handle
	 *
	 * Check for correct nonce and pass to handler.
	 */
	public function maybe_handle() {
		// Don't lock up other requests while processing
		session_write_close();

		check_ajax_referer( $this->identifier, 'nonce' );

		$this->handle();

		wp_die();
	}

	/**
	 * Handle
	 *
	 * Override this method to perform any actions required
	 * during the async request.
	 */
	abstract protected function handle();

}
wp-background-process.php000064400000024263151542601540011506 0ustar00<?php // @codingStandardsIgnoreLine.
/**
 * Abstract WP_Background_Process class.
 *
 * @package WP-Background-Processing
 * @extends WP_Async_Request
 */

defined( 'ABSPATH' ) || exit;

/**
 * Abstract WP_Background_Process class.
 */
abstract class WP_Background_Process extends WP_Async_Request {

	/**
	 * Action
	 *
	 * (default value: 'background_process')
	 *
	 * @var string
	 * @access protected
	 */
	protected $action = 'background_process';

	/**
	 * Start time of current process.
	 *
	 * (default value: 0)
	 *
	 * @var int
	 * @access protected
	 */
	protected $start_time = 0;

	/**
	 * Cron_hook_identifier
	 *
	 * @var mixed
	 * @access protected
	 */
	protected $cron_hook_identifier;

	/**
	 * Cron_interval_identifier
	 *
	 * @var mixed
	 * @access protected
	 */
	protected $cron_interval_identifier;

	/**
	 * Initiate new background process
	 */
	public function __construct() {
		parent::__construct();

		$this->cron_hook_identifier     = $this->identifier . '_cron';
		$this->cron_interval_identifier = $this->identifier . '_cron_interval';

		add_action( $this->cron_hook_identifier, array( $this, 'handle_cron_healthcheck' ) );
		add_filter( 'cron_schedules', array( $this, 'schedule_cron_healthcheck' ) );
	}

	/**
	 * Dispatch
	 *
	 * @access public
	 * @return void
	 */
	public function dispatch() {
		// Schedule the cron healthcheck.
		$this->schedule_event();

		// Perform remote post.
		return parent::dispatch();
	}

	/**
	 * Push to queue
	 *
	 * @param mixed $data Data.
	 *
	 * @return $this
	 */
	public function push_to_queue( $data ) {
		$this->data[] = $data;

		return $this;
	}

	/**
	 * Save queue
	 *
	 * @return $this
	 */
	public function save() {
		$key = $this->generate_key();

		if ( ! empty( $this->data ) ) {
			update_site_option( $key, $this->data );
		}

		return $this;
	}

	/**
	 * Update queue
	 *
	 * @param string $key Key.
	 * @param array  $data Data.
	 *
	 * @return $this
	 */
	public function update( $key, $data ) {
		if ( ! empty( $data ) ) {
			update_site_option( $key, $data );
		}

		return $this;
	}

	/**
	 * Delete queue
	 *
	 * @param string $key Key.
	 *
	 * @return $this
	 */
	public function delete( $key ) {
		delete_site_option( $key );

		return $this;
	}

	/**
	 * Generate key
	 *
	 * Generates a unique key based on microtime. Queue items are
	 * given a unique key so that they can be merged upon save.
	 *
	 * @param int $length Length.
	 *
	 * @return string
	 */
	protected function generate_key( $length = 64 ) {
		$unique  = md5( microtime() . rand() );
		$prepend = $this->identifier . '_batch_';

		return substr( $prepend . $unique, 0, $length );
	}

	/**
	 * Maybe process queue
	 *
	 * Checks whether data exists within the queue and that
	 * the process is not already running.
	 */
	public function maybe_handle() {
		// Don't lock up other requests while processing
		session_write_close();

		if ( $this->is_process_running() ) {
			// Background process already running.
			wp_die();
		}

		if ( $this->is_queue_empty() ) {
			// No data to process.
			wp_die();
		}

		check_ajax_referer( $this->identifier, 'nonce' );

		$this->handle();

		wp_die();
	}

	/**
	 * Is queue empty
	 *
	 * @return bool
	 */
	protected function is_queue_empty() {
		global $wpdb;

		$table  = $wpdb->options;
		$column = 'option_name';

		if ( is_multisite() ) {
			$table  = $wpdb->sitemeta;
			$column = 'meta_key';
		}

		$key = $this->identifier . '_batch_%';

		$count = $wpdb->get_var( $wpdb->prepare( "
			SELECT COUNT(*)
			FROM {$table}
			WHERE {$column} LIKE %s
		", $key ) );

		return ! ( $count > 0 );
	}

	/**
	 * Is process running
	 *
	 * Check whether the current process is already running
	 * in a background process.
	 */
	protected function is_process_running() {
		if ( get_site_transient( $this->identifier . '_process_lock' ) ) {
			// Process already running.
			return true;
		}

		return false;
	}

	/**
	 * Lock process
	 *
	 * Lock the process so that multiple instances can't run simultaneously.
	 * Override if applicable, but the duration should be greater than that
	 * defined in the time_exceeded() method.
	 */
	protected function lock_process() {
		$this->start_time = time(); // Set start time of current process.

		$lock_duration = ( property_exists( $this, 'queue_lock_time' ) ) ? $this->queue_lock_time : 60; // 1 minute
		$lock_duration = apply_filters( $this->identifier . '_queue_lock_time', $lock_duration );

		set_site_transient( $this->identifier . '_process_lock', microtime(), $lock_duration );
	}

	/**
	 * Unlock process
	 *
	 * Unlock the process so that other instances can spawn.
	 *
	 * @return $this
	 */
	protected function unlock_process() {
		delete_site_transient( $this->identifier . '_process_lock' );

		return $this;
	}

	/**
	 * Get batch
	 *
	 * @return stdClass Return the first batch from the queue
	 */
	protected function get_batch() {
		global $wpdb;

		$table        = $wpdb->options;
		$column       = 'option_name';
		$key_column   = 'option_id';
		$value_column = 'option_value';

		if ( is_multisite() ) {
			$table        = $wpdb->sitemeta;
			$column       = 'meta_key';
			$key_column   = 'meta_id';
			$value_column = 'meta_value';
		}

		$key = $this->identifier . '_batch_%';

		$query = $wpdb->get_row( $wpdb->prepare( "
			SELECT *
			FROM {$table}
			WHERE {$column} LIKE %s
			ORDER BY {$key_column} ASC
			LIMIT 1
		", $key ) );

		$batch       = new stdClass();
		$batch->key  = $query->$column;
		$batch->data = maybe_unserialize( $query->$value_column );

		return $batch;
	}

	/**
	 * Handle
	 *
	 * Pass each queue item to the task handler, while remaining
	 * within server memory and time limit constraints.
	 */
	protected function handle() {
		$this->lock_process();

		do {
			$batch = $this->get_batch();

			foreach ( $batch->data as $key => $value ) {
				$task = $this->task( $value );

				if ( false !== $task ) {
					$batch->data[ $key ] = $task;
				} else {
					unset( $batch->data[ $key ] );
				}

				if ( $this->time_exceeded() || $this->memory_exceeded() ) {
					// Batch limits reached.
					break;
				}
			}

			// Update or delete current batch.
			if ( ! empty( $batch->data ) ) {
				$this->update( $batch->key, $batch->data );
			} else {
				$this->delete( $batch->key );
			}
		} while ( ! $this->time_exceeded() && ! $this->memory_exceeded() && ! $this->is_queue_empty() );

		$this->unlock_process();

		// Start next batch or complete process.
		if ( ! $this->is_queue_empty() ) {
			$this->dispatch();
		} else {
			$this->complete();
		}

		wp_die();
	}

	/**
	 * Memory exceeded
	 *
	 * Ensures the batch process never exceeds 90%
	 * of the maximum WordPress memory.
	 *
	 * @return bool
	 */
	protected function memory_exceeded() {
		$memory_limit   = $this->get_memory_limit() * 0.9; // 90% of max memory
		$current_memory = memory_get_usage( true );
		$return         = false;

		if ( $current_memory >= $memory_limit ) {
			$return = true;
		}

		return apply_filters( $this->identifier . '_memory_exceeded', $return );
	}

	/**
	 * Get memory limit
	 *
	 * @return int
	 */
	protected function get_memory_limit() {
		if ( function_exists( 'ini_get' ) ) {
			$memory_limit = ini_get( 'memory_limit' );
		} else {
			// Sensible default.
			$memory_limit = '128M';
		}

		if ( ! $memory_limit || -1 === $memory_limit ) {
			// Unlimited, set to 32GB.
			$memory_limit = '32000M';
		}

		return wp_convert_hr_to_bytes( $memory_limit );
	}

	/**
	 * Time exceeded.
	 *
	 * Ensures the batch never exceeds a sensible time limit.
	 * A timeout limit of 30s is common on shared hosting.
	 *
	 * @return bool
	 */
	protected function time_exceeded() {
		$finish = $this->start_time + apply_filters( $this->identifier . '_default_time_limit', 20 ); // 20 seconds
		$return = false;

		if ( time() >= $finish ) {
			$return = true;
		}

		return apply_filters( $this->identifier . '_time_exceeded', $return );
	}

	/**
	 * Complete.
	 *
	 * Override if applicable, but ensure that the below actions are
	 * performed, or, call parent::complete().
	 */
	protected function complete() {
		// Unschedule the cron healthcheck.
		$this->clear_scheduled_event();
	}

	/**
	 * Schedule cron healthcheck
	 *
	 * @access public
	 * @param mixed $schedules Schedules.
	 * @return mixed
	 */
	public function schedule_cron_healthcheck( $schedules ) {
		$interval = apply_filters( $this->identifier . '_cron_interval', 5 );

		if ( property_exists( $this, 'cron_interval' ) ) {
			$interval = apply_filters( $this->identifier . '_cron_interval', $this->cron_interval );
		}

		// Adds every 5 minutes to the existing schedules.
		$schedules[ $this->identifier . '_cron_interval' ] = array(
			'interval' => MINUTE_IN_SECONDS * $interval,
			'display'  => sprintf( __( 'Every %d minutes', 'woocommerce' ), $interval ),
		);

		return $schedules;
	}

	/**
	 * Handle cron healthcheck
	 *
	 * Restart the background process if not already running
	 * and data exists in the queue.
	 */
	public function handle_cron_healthcheck() {
		if ( $this->is_process_running() ) {
			// Background process already running.
			exit;
		}

		if ( $this->is_queue_empty() ) {
			// No data to process.
			$this->clear_scheduled_event();
			exit;
		}

		$this->handle();

		exit;
	}

	/**
	 * Schedule event
	 */
	protected function schedule_event() {
		if ( ! wp_next_scheduled( $this->cron_hook_identifier ) ) {
			wp_schedule_event( time(), $this->cron_interval_identifier, $this->cron_hook_identifier );
		}
	}

	/**
	 * Clear scheduled event
	 */
	protected function clear_scheduled_event() {
		$timestamp = wp_next_scheduled( $this->cron_hook_identifier );

		if ( $timestamp ) {
			wp_unschedule_event( $timestamp, $this->cron_hook_identifier );
		}
	}

	/**
	 * Cancel Process
	 *
	 * Stop processing queue items, clear cronjob and delete batch.
	 *
	 */
	public function cancel_process() {
		if ( ! $this->is_queue_empty() ) {
			$batch = $this->get_batch();

			$this->delete( $batch->key );

			wp_clear_scheduled_hook( $this->cron_hook_identifier );
		}

	}

	/**
	 * Task
	 *
	 * Override this method to perform any actions required on each
	 * queue item. Return the modified item for further processing
	 * in the next pass through. Or, return false to remove the
	 * item from the queue.
	 *
	 * @param mixed $item Queue item to iterate over.
	 *
	 * @return mixed
	 */
	abstract protected function task( $item );

}