forked from GNUsocial/gnu-social
229 lines
7.5 KiB
PHP
229 lines
7.5 KiB
PHP
<?php
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/*
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* StatusNet - the distributed open-source microblogging tool
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* Copyright (C) 2010, StatusNet, Inc.
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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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if (!defined('STATUSNET')) {
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exit(1);
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}
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/**
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* Prepare PuSH and Salmon distributions for an outgoing message.
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*
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* @package OStatusPlugin
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* @author Brion Vibber <brion@status.net>
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*/
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class OStatusQueueHandler extends QueueHandler
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{
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// If we have more than this many subscribing sites on a single feed,
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// break up the PuSH distribution into smaller batches which will be
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// rolled into the queue progressively. This reduces disruption to
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// other, shorter activities being enqueued while we work.
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const MAX_UNBATCHED = 50;
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// Each batch (a 'hubprep' entry) will have this many items.
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// Selected to provide a balance between queue packet size
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// and number of batches that will end up getting processed.
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// For 20,000 target sites, 1000 should work acceptably.
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const BATCH_SIZE = 1000;
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function transport()
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{
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return 'ostatus';
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}
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function handle($notice)
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{
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assert($notice instanceof Notice);
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$this->notice = $notice;
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$this->user = User::staticGet($notice->profile_id);
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$this->pushUser();
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foreach ($notice->getGroups() as $group) {
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$oprofile = Ostatus_profile::staticGet('group_id', $group->id);
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if ($oprofile) {
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$this->pingReply($oprofile);
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} else {
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$this->pushGroup($group->id);
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}
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}
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foreach ($notice->getReplies() as $profile_id) {
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$oprofile = Ostatus_profile::staticGet('profile_id', $profile_id);
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if ($oprofile) {
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$this->pingReply($oprofile);
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}
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}
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if (!empty($this->notice->reply_to)) {
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$replyTo = Notice::staticGet('id', $this->notice->reply_to);
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if (!empty($replyTo)) {
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foreach($replyTo->getReplies() as $profile_id) {
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$oprofile = Ostatus_profile::staticGet('profile_id', $profile_id);
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if ($oprofile) {
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$this->pingReply($oprofile);
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}
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}
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}
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}
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return true;
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}
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function pushUser()
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{
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if ($this->user) {
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// For local posts, ping the PuSH hub to update their feed.
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// http://identi.ca/api/statuses/user_timeline/1.atom
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$feed = common_local_url('ApiTimelineUser',
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array('id' => $this->user->id,
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'format' => 'atom'));
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$this->pushFeed($feed, array($this, 'userFeedForNotice'));
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}
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}
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function pushGroup($group_id)
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{
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// For a local group, ping the PuSH hub to update its feed.
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// Updates may come from either a local or a remote user.
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$feed = common_local_url('ApiTimelineGroup',
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array('id' => $group_id,
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'format' => 'atom'));
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$this->pushFeed($feed, array($this, 'groupFeedForNotice'), $group_id);
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}
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function pingReply($oprofile)
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{
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if ($this->user) {
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// For local posts, send a Salmon ping to the mentioned
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// remote user or group.
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// @fixme as an optimization we can skip this if the
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// remote profile is subscribed to the author.
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$oprofile->notifyDeferred($this->notice, $this->user);
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}
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}
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/**
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* @param string $feed URI to the feed
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* @param callable $callback function to generate Atom feed update if needed
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* any additional params are passed to the callback.
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*/
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function pushFeed($feed, $callback)
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{
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$hub = common_config('ostatus', 'hub');
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if ($hub) {
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$this->pushFeedExternal($feed, $hub);
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}
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$sub = new HubSub();
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$sub->topic = $feed;
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if ($sub->find()) {
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$args = array_slice(func_get_args(), 2);
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$atom = call_user_func_array($callback, $args);
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$this->pushFeedInternal($atom, $sub);
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} else {
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common_log(LOG_INFO, "No PuSH subscribers for $feed");
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}
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return true;
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}
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/**
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* Ping external hub about this update.
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* The hub will pull the feed and check for new items later.
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* Not guaranteed safe in an environment with database replication.
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*
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* @param string $feed feed topic URI
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* @param string $hub PuSH hub URI
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* @fixme can consolidate pings for user & group posts
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*/
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function pushFeedExternal($feed, $hub)
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{
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$client = new HTTPClient();
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try {
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$data = array('hub.mode' => 'publish',
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'hub.url' => $feed);
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$response = $client->post($hub, array(), $data);
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if ($response->getStatus() == 204) {
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common_log(LOG_INFO, "PuSH ping to hub $hub for $feed ok");
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return true;
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} else {
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common_log(LOG_ERR, "PuSH ping to hub $hub for $feed failed with HTTP " .
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$response->getStatus() . ': ' .
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$response->getBody());
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}
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} catch (Exception $e) {
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common_log(LOG_ERR, "PuSH ping to hub $hub for $feed failed: " . $e->getMessage());
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return false;
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}
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}
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/**
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* Queue up direct feed update pushes to subscribers on our internal hub.
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* If there are a large number of subscriber sites, intermediate bulk
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* distribution triggers may be queued.
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*
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* @param string $atom update feed, containing only new/changed items
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* @param HubSub $sub open query of subscribers
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*/
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function pushFeedInternal($atom, $sub)
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{
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common_log(LOG_INFO, "Preparing $sub->N PuSH distribution(s) for $sub->topic");
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$n = 0;
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$batch = array();
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while ($sub->fetch()) {
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$n++;
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if ($n < self::MAX_UNBATCHED) {
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$sub->distribute($atom);
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} else {
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$batch[] = $sub->callback;
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if (count($batch) >= self::BATCH_SIZE) {
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$sub->bulkDistribute($atom, $batch);
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$batch = array();
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}
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}
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}
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if (count($batch) >= 0) {
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$sub->bulkDistribute($atom, $batch);
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}
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}
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/**
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* Build a single-item version of the sending user's Atom feed.
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* @return string
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*/
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function userFeedForNotice()
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{
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$atom = new AtomUserNoticeFeed($this->user);
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$atom->addEntryFromNotice($this->notice);
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$feed = $atom->getString();
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return $feed;
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}
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function groupFeedForNotice($group_id)
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{
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$group = User_group::staticGet('id', $group_id);
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$atom = new AtomGroupNoticeFeed($group);
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$atom->addEntryFromNotice($this->notice);
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$feed = $atom->getString();
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return $feed;
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}
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}
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