119 lines
3.5 KiB
PHP
119 lines
3.5 KiB
PHP
<?php
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/**
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* StatusNet - the distributed open-source microblogging tool
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* Copyright (C) 2011, StatusNet, Inc.
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*
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* A notice stream that filters its upstream content
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*
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* PHP version 5
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @category Stream
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @copyright 2011 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
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* @link http://status.net/
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*/
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if (!defined('STATUSNET')) {
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// This check helps protect against security problems;
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// your code file can't be executed directly from the web.
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exit(1);
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}
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/**
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* A class for presenting a filtered notice stream based on an upstream stream
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*
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* @category Stream
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @copyright 2011 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
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* @link http://status.net/
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*/
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abstract class FilteringNoticeStream extends NoticeStream
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{
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protected $upstream;
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function __construct(NoticeStream $upstream)
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{
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$this->upstream = $upstream;
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}
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/**
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* @return boolean true if we allow it, false if we deny it
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*/
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abstract protected function filter(Notice $notice);
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function getNoticeIds($offset, $limit, $since_id, $max_id)
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{
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// "offset" is virtual; we have to get a lot
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$total = $offset + $limit;
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$filtered = array();
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$startAt = 0;
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$askFor = $total;
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// Keep going till we have $total notices in $notices array,
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// or we get nothing from upstream.
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$results = null;
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$round = 0;
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do {
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$raw = $this->upstream->getNotices($startAt, $askFor, $since_id, $max_id);
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$results = $raw->N;
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if ($results == 0) {
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break;
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}
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$notices = $raw->fetchAll();
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$this->prefill($notices);
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foreach ($notices as $notice) {
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if ($this->filter($notice)) {
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$filtered[] = $notice->id;
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if (count($filtered) >= $total) {
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break;
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}
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}
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}
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// XXX: make these smarter; factor hit rate into $askFor
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$startAt += $askFor;
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$hits = count($filtered);
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$lastAsk = $askFor;
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if ($hits === 0) {
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$askFor = max(min(2 * $askFor, NOTICES_PER_PAGE * 50), NOTICES_PER_PAGE);
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} else {
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$askFor = max(min(intval(ceil(($total - $hits)*$startAt/$hits)), NOTICES_PER_PAGE * 50), NOTICES_PER_PAGE);
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}
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$round++;
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} while (count($filtered) < $total && $results >= $lastAsk);
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return array_slice(array_values($filtered), $offset, $limit);
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}
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function prefill($notices)
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{
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return;
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}
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}
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