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<?php
/*
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2010, StatusNet, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* Prepare PuSH and Salmon distributions for an outgoing message.
*
* @package OStatusPlugin
* @author Brion Vibber <brion@status.net>
*/
class OStatusQueueHandler extends QueueHandler
{
// If we have more than this many subscribing sites on a single feed,
// break up the PuSH distribution into smaller batches which will be
// rolled into the queue progressively. This reduces disruption to
// other, shorter activities being enqueued while we work.
const MAX_UNBATCHED = 50;
// Each batch (a 'hubprep' entry) will have this many items.
// Selected to provide a balance between queue packet size
// and number of batches that will end up getting processed.
// For 20,000 target sites, 1000 should work acceptably.
const BATCH_SIZE = 1000;
function transport()
{
return 'ostatus';
}
function handle($notice)
{
assert($notice instanceof Notice);
$this->notice = $notice;
$this->user = User::staticGet($notice->profile_id);
$this->pushUser();
foreach ($notice->getGroups() as $group) {
$oprofile = Ostatus_profile::staticGet('group_id', $group->id);
if ($oprofile) {
$this->pingReply($oprofile);
} else {
$this->pushGroup($group->id);
}
}
foreach ($notice->getReplies() as $profile_id) {
$oprofile = Ostatus_profile::staticGet('profile_id', $profile_id);
if ($oprofile) {
$this->pingReply($oprofile);
}
}
return true;
}
function pushUser()
{
if ($this->user) {
// For local posts, ping the PuSH hub to update their feed.
// http://identi.ca/api/statuses/user_timeline/1.atom
$feed = common_local_url('ApiTimelineUser',
array('id' => $this->user->id,
'format' => 'atom'));
$this->pushFeed($feed, array($this, 'userFeedForNotice'));
}
}
function pushGroup($group_id)
{
// For a local group, ping the PuSH hub to update its feed.
// Updates may come from either a local or a remote user.
$feed = common_local_url('ApiTimelineGroup',
array('id' => $group_id,
'format' => 'atom'));
$this->pushFeed($feed, array($this, 'groupFeedForNotice'), $group_id);
}
function pingReply($oprofile)
{
if ($this->user) {
// For local posts, send a Salmon ping to the mentioned
// remote user or group.
// @fixme as an optimization we can skip this if the
// remote profile is subscribed to the author.
$oprofile->notifyDeferred($this->notice, $this->user);
}
}
/**
* @param string $feed URI to the feed
* @param callable $callback function to generate Atom feed update if needed
* any additional params are passed to the callback.
*/
function pushFeed($feed, $callback)
{
$hub = common_config('ostatus', 'hub');
if ($hub) {
$this->pushFeedExternal($feed, $hub);
}
$sub = new HubSub();
$sub->topic = $feed;
if ($sub->find()) {
$args = array_slice(func_get_args(), 2);
$atom = call_user_func_array($callback, $args);
$this->pushFeedInternal($atom, $sub);
} else {
common_log(LOG_INFO, "No PuSH subscribers for $feed");
}
return true;
}
/**
* Ping external hub about this update.
* The hub will pull the feed and check for new items later.
* Not guaranteed safe in an environment with database replication.
*
* @param string $feed feed topic URI
* @param string $hub PuSH hub URI
* @fixme can consolidate pings for user & group posts
*/
function pushFeedExternal($feed, $hub)
{
$client = new HTTPClient();
try {
$data = array('hub.mode' => 'publish',
'hub.url' => $feed);
$response = $client->post($hub, array(), $data);
if ($response->getStatus() == 204) {
common_log(LOG_INFO, "PuSH ping to hub $hub for $feed ok");
return true;
} else {
common_log(LOG_ERR, "PuSH ping to hub $hub for $feed failed with HTTP " .
$response->getStatus() . ': ' .
$response->getBody());
}
} catch (Exception $e) {
common_log(LOG_ERR, "PuSH ping to hub $hub for $feed failed: " . $e->getMessage());
return false;
}
}
/**
* Queue up direct feed update pushes to subscribers on our internal hub.
* If there are a large number of subscriber sites, intermediate bulk
* distribution triggers may be queued.
*
* @param string $atom update feed, containing only new/changed items
* @param HubSub $sub open query of subscribers
*/
function pushFeedInternal($atom, $sub)
{
common_log(LOG_INFO, "Preparing $sub->N PuSH distribution(s) for $sub->topic");
$n = 0;
$batch = array();
while ($sub->fetch()) {
$n++;
if ($n < self::MAX_UNBATCHED) {
$sub->distribute($atom);
} else {
$batch[] = $sub->callback;
if (count($batch) >= self::BATCH_SIZE) {
$sub->bulkDistribute($atom, $batch);
$batch = array();
}
}
}
if (count($batch) >= 0) {
$sub->bulkDistribute($atom, $batch);
}
}
/**
* Build a single-item version of the sending user's Atom feed.
* @return string
*/
function userFeedForNotice()
{
$atom = new AtomUserNoticeFeed($this->user);
$atom->addEntryFromNotice($this->notice);
$feed = $atom->getString();
return $feed;
}
function groupFeedForNotice($group_id)
{
$group = User_group::staticGet('id', $group_id);
$atom = new AtomGroupNoticeFeed($group);
$atom->addEntryFromNotice($this->notice);
$feed = $atom->getString();
return $feed;
}
}
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