463 lines
15 KiB
PHP
463 lines
15 KiB
PHP
<?php
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// $Id$
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/**
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* @file
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* Batch processing API for processes to run in multiple HTTP requests.
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*
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* Please note that batches are usually invoked by form submissions, which is
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* why the core interaction functions of the batch processing API live in
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* form.inc.
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*
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* @see form.inc
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* @see batch_set()
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* @see batch_process()
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* @see batch_get()
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*/
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/**
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* State-based dispatcher for the batch processing page.
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*
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* @see _batch_shutdown()
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*/
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function _batch_page() {
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$batch = &batch_get();
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if (!isset($_REQUEST['id'])) {
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return FALSE;
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}
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// Retrieve the current state of batch from db.
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$batch = db_query("SELECT batch FROM {batch} WHERE bid = :bid AND token = :token", array(
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':bid' => $_REQUEST['id'],
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':token' => drupal_get_token($_REQUEST['id']))
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)->fetchField();
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if (!$batch) {
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drupal_set_message(t('No active batch.'), 'error');
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drupal_goto();
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}
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$batch = unserialize($batch);
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// Register database update for the end of processing.
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register_shutdown_function('_batch_shutdown');
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// Add batch-specific CSS.
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foreach ($batch['sets'] as $batch_set) {
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foreach ($batch_set['css'] as $css) {
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drupal_add_css($css);
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}
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}
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$op = isset($_REQUEST['op']) ? $_REQUEST['op'] : '';
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$output = NULL;
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switch ($op) {
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case 'start':
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$output = _batch_start();
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break;
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case 'do':
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// JavaScript-based progress page callback.
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_batch_do();
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break;
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case 'do_nojs':
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// Non-JavaScript-based progress page.
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$output = _batch_progress_page_nojs();
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break;
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case 'finished':
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$output = _batch_finished();
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break;
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}
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return $output;
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}
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/**
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* Initialize the batch processing.
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*
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* JavaScript-enabled clients are identified by the 'has_js' cookie set in
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* drupal.js. If no JavaScript-enabled page has been visited during the current
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* user's browser session, the non-JavaScript version is returned.
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*/
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function _batch_start() {
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if (isset($_COOKIE['has_js']) && $_COOKIE['has_js']) {
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return _batch_progress_page_js();
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}
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else {
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return _batch_progress_page_nojs();
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}
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}
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/**
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* Output a batch processing page with JavaScript support.
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*
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* This initializes the batch and error messages. Note that in JavaScript-based
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* processing, the batch processing page is displayed only once and updated via
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* AHAH requests, so only the first batch set gets to define the page title.
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* Titles specified by subsequent batch sets are not displayed.
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*
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* @see batch_set()
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* @see _batch_do()
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*/
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function _batch_progress_page_js() {
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$batch = batch_get();
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$current_set = _batch_current_set();
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drupal_set_title($current_set['title'], PASS_THROUGH);
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$js_setting = array(
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'batch' => array(
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'errorMessage' => $current_set['error_message'] . '<br />' . $batch['error_message'],
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'initMessage' => $current_set['init_message'],
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'uri' => url($batch['url'], array('query' => array('id' => $batch['id']))),
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),
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);
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drupal_add_js($js_setting, 'setting');
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drupal_add_js('misc/progress.js', array('cache' => FALSE));
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drupal_add_js('misc/batch.js', array('cache' => FALSE));
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return '<div id="progress"></div>';
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}
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/**
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* Do one pass of execution in JavaScript-mode and return progress to the browser.
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*
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* @see _batch_progress_page_js()
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* @see _batch_process()
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*/
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function _batch_do() {
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// HTTP POST required.
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if ($_SERVER['REQUEST_METHOD'] != 'POST') {
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drupal_set_message(t('HTTP POST is required.'), 'error');
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drupal_set_title(t('Error'));
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return '';
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}
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// Perform actual processing.
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list($percentage, $message) = _batch_process();
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drupal_json(array('status' => TRUE, 'percentage' => $percentage, 'message' => $message));
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}
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/**
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* Output a batch processing page without JavaScript support.
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*
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* @see _batch_process()
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*/
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function _batch_progress_page_nojs() {
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$batch = &batch_get();
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$current_set = _batch_current_set();
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drupal_set_title($current_set['title'], PASS_THROUGH);
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$new_op = 'do_nojs';
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if (!isset($batch['running'])) {
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// This is the first page so we return some output immediately.
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$percentage = 0;
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$message = $current_set['init_message'];
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$batch['running'] = TRUE;
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}
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else {
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// This is one of the later requests; do some processing first.
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// Error handling: if PHP dies due to a fatal error (e.g. a nonexistent
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// function), it will output whatever is in the output buffer, followed by
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// the error message.
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ob_start();
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$fallback = $current_set['error_message'] . '<br />' . $batch['error_message'];
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$fallback = theme('maintenance_page', $fallback, FALSE, FALSE);
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// We strip the end of the page using a marker in the template, so any
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// additional HTML output by PHP shows up inside the page rather than below
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// it. While this causes invalid HTML, the same would be true if we didn't,
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// as content is not allowed to appear after </html> anyway.
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list($fallback) = explode('<!--partial-->', $fallback);
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print $fallback;
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// Perform actual processing.
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list($percentage, $message) = _batch_process($batch);
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if ($percentage == 100) {
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$new_op = 'finished';
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}
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// PHP did not die; remove the fallback output.
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ob_end_clean();
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}
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$url = url($batch['url'], array('query' => array('id' => $batch['id'], 'op' => $new_op)));
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drupal_add_html_head('<meta http-equiv="Refresh" content="0; URL=' . $url . '">');
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return theme('progress_bar', $percentage, $message);
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}
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/**
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* Process sets in a batch.
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*
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* If the batch was marked for progressive execution (default), this executes as
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* many operations in batch sets until an execution time of 1 second has been
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* exceeded. It will continue with the next operation of the same batch set in
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* the next request.
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*
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* @return
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* An array containing a completion value (in percent) and a status message.
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*/
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function _batch_process() {
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$batch = &batch_get();
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$current_set = &_batch_current_set();
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// Indicate that this batch set needs to be initialized.
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$set_changed = TRUE;
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// If this batch was marked for progressive execution (e.g. forms submitted by
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// drupal_form_submit()), initialize a timer to determine whether we need to
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// proceed with the same batch phase when a processing time of 1 second has
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// been exceeded.
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if ($batch['progressive']) {
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timer_start('batch_processing');
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}
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while (!$current_set['success']) {
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// If this is the first time we iterate this batch set in the current
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// request, we check if it requires an additional file for functions
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// definitions.
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if ($set_changed && isset($current_set['file']) && is_file($current_set['file'])) {
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include_once DRUPAL_ROOT . '/' . $current_set['file'];
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}
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$task_message = '';
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// We assume a single pass operation and set the completion level to 1 by
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// default.
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$finished = 1;
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if ((list($function, $args) = reset($current_set['operations'])) && function_exists($function)) {
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// Build the 'context' array, execute the function call, and retrieve the
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// user message.
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$batch_context = array(
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'sandbox' => &$current_set['sandbox'],
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'results' => &$current_set['results'],
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'finished' => &$finished,
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'message' => &$task_message,
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);
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// Process the current operation.
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call_user_func_array($function, array_merge($args, array(&$batch_context)));
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}
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if ($finished == 1) {
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// Make sure this step is not counted twice when computing $current.
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$finished = 0;
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// Remove the processed operation and clear the sandbox.
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array_shift($current_set['operations']);
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$current_set['sandbox'] = array();
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}
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// When all operations in the current batch set are completed, browse
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// through the remaining sets until we find a set that contains operations.
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// Note that _batch_next_set() executes stored form submit handlers in
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// remaining batch sets, which can add new sets to the batch.
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$set_changed = FALSE;
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$old_set = $current_set;
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while (empty($current_set['operations']) && ($current_set['success'] = TRUE) && _batch_next_set()) {
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$current_set = &_batch_current_set();
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$set_changed = TRUE;
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}
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// At this point, either $current_set contains operations that need to be
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// processed or all sets have been completed.
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// If we are in progressive mode, break processing after 1 second.
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if ($batch['progressive'] && timer_read('batch_processing') > 1000) {
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// Record elapsed wall clock time.
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$current_set['elapsed'] = round((microtime(TRUE) - $current_set['start']) * 1000, 2);
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break;
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}
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}
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if ($batch['progressive']) {
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// Gather progress information.
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// Reporting 100% progress will cause the whole batch to be considered
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// processed. If processing was paused right after moving to a new set,
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// we have to use the info from the new (unprocessed) set.
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if ($set_changed && isset($current_set['operations'])) {
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// Processing will continue with a fresh batch set.
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$remaining = count($current_set['operations']);
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$total = $current_set['total'];
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$progress_message = $current_set['init_message'];
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$task_message = '';
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}
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else {
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// Processing will continue with the current batch set.
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$remaining = count($old_set['operations']);
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$total = $old_set['total'];
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$progress_message = $old_set['progress_message'];
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}
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$current = $total - $remaining + $finished;
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$percentage = _batch_api_percentage($total, $current);
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$elapsed = $current_set['elapsed'];
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// Estimate remaining with percentage in floating format.
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$estimate = $elapsed * ($total - $current) / $current;
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$values = array(
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'@remaining' => $remaining,
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'@total' => $total,
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'@current' => floor($current),
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'@percentage' => $percentage,
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'@elapsed' => format_interval($elapsed / 1000),
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'@estimate' => format_interval($estimate / 1000),
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);
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$message = strtr($progress_message, $values);
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if (!empty($message)) {
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$message .= '<br />';
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}
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if (!empty($task_message)) {
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$message .= $task_message;
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}
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return array($percentage, $message);
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}
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else {
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// If we are not in progressive mode, the entire batch has been processed.
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return _batch_finished();
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}
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}
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/**
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* Helper function for _batch_process(): returns the formatted percentage.
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*
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* @param $total
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* The total number of operations.
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* @param $current
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* The number of the current operation.
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* @return
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* The properly formatted percentage, as a string. We output percentages
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* using the correct number of decimal places so that we never print "100%"
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* until we are finished, but we also never print more decimal places than
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* are meaningful.
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*/
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function _batch_api_percentage($total, $current) {
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if (!$total || $total == $current) {
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// If $total doesn't evaluate as true or is equal to the current set, then
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// we're finished, and we can return "100".
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$percentage = "100";
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}
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else {
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// We add a new digit at 200, 2000, etc. (since, for example, 199/200
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// would round up to 100% if we didn't).
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$decimal_places = max(0, floor(log10($total / 2.0)) - 1);
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$percentage = sprintf('%01.' . $decimal_places . 'f', round($current / $total * 100, $decimal_places));
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}
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return $percentage;
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}
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/**
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* Return the batch set being currently processed.
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*/
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function &_batch_current_set() {
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$batch = &batch_get();
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return $batch['sets'][$batch['current_set']];
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}
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/**
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* Retrieve the next set in a batch.
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*
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* If there is a subsequent set in this batch, assign it as the new set to
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* process and execute its form submit handler (if defined), which may add
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* further sets to this batch.
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*
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* @return
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* TRUE if a subsequent set was found in the batch.
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*/
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function _batch_next_set() {
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$batch = &batch_get();
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if (isset($batch['sets'][$batch['current_set'] + 1])) {
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$batch['current_set']++;
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$current_set = &_batch_current_set();
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if (isset($current_set['form_submit']) && ($function = $current_set['form_submit']) && function_exists($function)) {
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// We use our stored copies of $form and $form_state to account for
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// possible alterations by previous form submit handlers.
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$function($batch['form'], $batch['form_state']);
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}
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return TRUE;
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}
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}
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/**
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* End the batch processing.
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*
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* Call the 'finished' callback of each batch set to allow custom handling of
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* the results and resolve page redirection.
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*/
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function _batch_finished() {
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$batch = &batch_get();
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// Execute the 'finished' callbacks for each batch set, if defined.
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foreach ($batch['sets'] as $key => $batch_set) {
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if (isset($batch_set['finished'])) {
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// Check if the set requires an additional file for function definitions.
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if (isset($batch_set['file']) && is_file($batch_set['file'])) {
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include_once DRUPAL_ROOT . '/' . $batch_set['file'];
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}
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if (function_exists($batch_set['finished'])) {
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// Format the elapsed time when batch complete.
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$batch_set['finished']($batch_set['success'], $batch_set['results'], $batch_set['operations'], format_interval($batch_set['elapsed'] / 1000));
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}
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}
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}
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// Clean up the batch table and unset the static $batch variable.
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if ($batch['progressive']) {
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db_delete('batch')
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->condition('bid', $batch['id'])
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->execute();
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}
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$_batch = $batch;
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$batch = NULL;
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// Redirect if needed.
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if ($_batch['progressive']) {
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// Revert the 'destination' that was saved in batch_process().
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if (isset($_batch['destination'])) {
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$_REQUEST['destination'] = $_batch['destination'];
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}
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// Determine the target path to redirect to.
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if (isset($_batch['form_state']['redirect'])) {
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$redirect = $_batch['form_state']['redirect'];
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}
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elseif (isset($_batch['redirect'])) {
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$redirect = $_batch['redirect'];
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}
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else {
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$redirect = $_batch['source_page'];
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}
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// Use drupal_redirect_form() to handle the redirection logic.
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$form = isset($batch['form']) ? $batch['form'] : array();
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if (empty($_batch['form_state']['rebuild']) && empty($_batch['form_state']['storage'])) {
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drupal_redirect_form($form, $redirect);
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}
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// We get here if $form['#redirect'] was FALSE, or if the form is a
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// multi-step form. We save the final $form_state value to be retrieved
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// by drupal_get_form(), and redirect to the originating page.
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drupal_set_session('batch_form_state', $_batch['form_state']);
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drupal_goto($_batch['source_page']);
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}
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}
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/**
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* Shutdown function; store the current batch data for the next request.
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*/
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function _batch_shutdown() {
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if ($batch = batch_get()) {
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db_update('batch')
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->fields(array('batch' => serialize($batch)))
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->condition('bid', $batch['id'])
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->execute();
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}
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}
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