// insert anchor prefix
if (is_object($anchor)) {
$context['text'] .= $anchor->get_prefix();
}
// main url
if ($item['main_url']) {
$context['text'] .= '<p>' . sprintf(i18n::s('Main URL: %s'), Skin::build_link($item['main_url'], NULL, 'external')) . "</p>\n";
}
// no feed url
if (!$item['feed_url']) {
Logger::error(i18n::s('No feed url has been configured for this server profile.'));
} else {
// display the feed URL
$context['text'] .= '<p>' . sprintf(i18n::s('Feed URL: %s'), Skin::build_link($item['feed_url'], NULL, 'external')) . "</p>\n";
// fetch news from the provided link
if (!($news = Feeds::get_remote_news_from($item['feed_url'])) || !is_array($news)) {
$context['text'] .= '<p>' . i18n::s('Nothing to read from this feed.') . "</p>\n";
} else {
// statistics
$context['text'] .= '<p>' . sprintf(i18n::s('%d elements have been read'), count($news)) . "</p>\n";
// list banned hosts
$banned_pattern = Servers::get_banned_pattern();
// where links should be anchored
$reference = '';
if (is_object($anchor)) {
$reference = $anchor->get_reference();
}
// process retrieved links
$context['text'] .= '<ul>' . "\n";
foreach ($news as $item) {
// debug
/**
* get news from remote servers
*
* This function queries remote sources and populate the table of links based on fetched news.
*
* On tick, the including hook calls [code]Feeds::tick_hook()[/code].
* See [script]control/scan.php[/script] for a more complete description of hooks.
*
* The function browses the database to locate servers acting as feeders, and read the URLs to use.
*
* A round-robin algorithm is implemented, meaning that servers are polled in sequence throughout successive ticks.
* At most 1 feed is parsed on each tick, to limit impact when the "poor-man" cron mechanism is used,
* which is the default setting.
*
* XML feeds are fetched and parsed according to their type.
* At the moment YACS is able to process RSS and slashdot feeds.
* Link records are created or updated in the database saving as much of possible of provided data.
* Item data is reflected in Link, Title, and Description fields.
* Channel data is used to populate the Source field.
* Stamping information is based on feeding date, and channel title.
* Also, the edit action 'link:feed' marks links that are collected from feeders.
* The anchor field is set to the category assigned in the server profile.
*
* At the end of the feeding process, the database is purged from oldest links according to the limit
* defined in parameters/feeds.include.php, set through feeds/configure.php.
* See Links::purge_old_news().
*
* @param boolean if set to true, fetch news on each call; else use normal period of time
* @return a string to be displayed in resulting page, if any
*
* @see control/scan.php
* @see feeds/configure.php
*/
public static function tick_hook($forced = FALSE)
{
global $context;
// load librairies only once
include_once $context['path_to_root'] . 'links/links.php';
include_once $context['path_to_root'] . 'servers/servers.php';
include_once $context['path_to_root'] . 'shared/values.php';
// feeds.tick
// get feeding parameters
Safe::load('parameters/feeds.include.php');
// delay between feeds - minimum is 5 minutes
if (!isset($context['minutes_between_feeds']) || $context['minutes_between_feeds'] < 5) {
$context['minutes_between_feeds'] = 5;
}
// do not wait for the end of a feeding cycle
if ($forced) {
$threshold = gmstrftime('%Y-%m-%d %H:%M:%S');
} else {
$threshold = gmstrftime('%Y-%m-%d %H:%M:%S', time() - $context['minutes_between_feeds'] * 60);
}
// get a batch of feeders
if (!($feeders = Servers::list_for_feed(0, 1, 'feed'))) {
return 'feeds/feeds.php: no feed has been defined' . BR;
}
// remember start time
$start_time = get_micro_time();
// list banned tokens
$banned_pattern = Servers::get_banned_pattern();
// browse each feed
$count = 0;
foreach ($feeders as $server_id => $attributes) {
// get specific feed parameters
list($feed_url, $feed_title, $anchor, $stamp) = $attributes;
// skip servers processed recently
if ($stamp > $threshold) {
continue;
}
// flag this record to enable round-robin even on error
Servers::stamp($server_id);
// fetch news from the provided link
if (!($news = Feeds::get_remote_news_from($feed_url)) || !is_array($news)) {
continue;
}
// no anchor has been defined for this feed
if (!$anchor) {
// create a default section if necessary
if (!($anchor = Sections::lookup('external_news'))) {
$fields = array();
$fields['nick_name'] = 'external_news';
$fields['create_date'] = gmstrftime('%Y-%m-%d %H:%M:%S', time());
$fields['edit_date'] = gmstrftime('%Y-%m-%d %H:%M:%S', time());
$fields['index_map'] = 'N';
$fields['locked'] = 'Y';
// no direct contributions
$fields['rank'] = 40000;
// at the end of the list
$fields['title'] = i18n::c('External News');
$fields['description'] = i18n::c('Received from feeding servers');
if (!($fields['id'] = Sections::post($fields))) {
Logger::remember('feeds/feeds.php: Impossible to add a section.');
return;
}
$anchor = 'section:' . $fields['id'];
}
}
// process retrieved links
$links = 0;
foreach ($news as $item) {
// link has to be valid
if (!isset($item['link']) || !($item['title'] . $item['description'])) {
if (isset($context['debug_feeds']) && $context['debug_feeds'] == 'Y') {
Logger::remember('feeds/feeds.php: feed item is invalid', $item, 'debug');
}
continue;
}
// skip banned servers
if ($banned_pattern && preg_match($banned_pattern, $item['link'])) {
if (isset($context['debug_feeds']) && $context['debug_feeds'] == 'Y') {
Logger::remember('feeds/feeds.php: feed host has been banned', $item['link'], 'debug');
}
continue;
}
// one link processed
$links++;
// link description
$fields = array();
$fields['anchor'] = $anchor;
$fields['link_url'] = $item['link'];
$fields['title'] = $item['title'];
$fields['description'] = $item['description'];
if ($item['category']) {
$fields['description'] .= ' (' . $item['category'] . ')';
}
$fields['edit_name'] = $feed_title;
$fields['edit_address'] = $feed_url;
$fields['edit_action'] = 'link:feed';
if ($item['pubDate']) {
$fields['edit_date'] = gmstrftime('%Y-%m-%d %H:%M:%S', strtotime($item['pubDate']));
}
// update links that already exist in the database
if (Links::have($item['link'], $anchor, $fields)) {
continue;
}
// save link in the database
if (!Links::post($fields)) {
Logger::remember('feeds/feeds.php: Impossible to save feed link: ' . Logger::error_pop());
}
}
// one feed has been processed
$count += 1;
// remember tick date
Values::set('feeds.tick.' . $feed_url, $links);
}
// cap the number of links used for news
if (!isset($context['maximum_news']) || !$context['maximum_news']) {
$context['maximum_news'] = 1000;
}
if ($context['maximum_news'] > 10) {
include_once $context['path_to_root'] . 'links/links.php';
Links::purge_old_news($context['maximum_news']);
}
// compute execution time
$time = round(get_micro_time() - $start_time, 2);
// report on work achieved
if ($count > 1) {
return 'feeds/feeds.php: ' . $count . ' feeds have been processed (' . $time . ' seconds)' . BR;
} elseif ($count == 1) {
return 'feeds/feeds.php: 1 feed has been processed (' . $time . ' seconds)' . BR;
} else {
return 'feeds/feeds.php: nothing to do (' . $time . ' seconds)' . BR;
}
}