gnu-social/lib/useractivitystream.php

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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/>.
*/
/**
* Class for activity streams
*
* Includes objects like notices, subscriptions and from plugins.
*
* We extend atomusernoticefeed since it does some nice setup for us.
*
*/
class UserActivityStream extends AtomUserNoticeFeed
{
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public $activities = array();
public $after = null;
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const OUTPUT_STRING = 1;
const OUTPUT_RAW = 2;
public $outputMode = self::OUTPUT_STRING;
/**
*
* @param User $user
* @param boolean $indent
* @param boolean $outputMode: UserActivityStream::OUTPUT_STRING to return a string,
* or UserActivityStream::OUTPUT_RAW to go to raw output.
* Raw output mode will attempt to stream, keeping less
* data in memory but will leave $this->activities incomplete.
*/
function __construct($user, $indent = true, $outputMode = UserActivityStream::OUTPUT_STRING, $after = null)
{
parent::__construct($user, null, $indent);
$this->outputMode = $outputMode;
if ($this->outputMode == self::OUTPUT_STRING) {
// String buffering? Grab all the notices now.
$notices = $this->getNotices();
} elseif ($this->outputMode == self::OUTPUT_RAW) {
// Raw output... need to restructure from the stringer init.
$this->xw = new XMLWriter();
$this->xw->openURI('php://output');
if(is_null($indent)) {
$indent = common_config('site', 'indent');
}
$this->xw->setIndent($indent);
// We'll fetch notices later.
$notices = array();
} else {
throw new Exception('Invalid outputMode provided to ' . __METHOD__);
}
$this->after = $after;
// Assume that everything but notices is feasible
// to pull at once and work with in memory...
$subscriptions = $this->getSubscriptions();
$subscribers = $this->getSubscribers();
$groups = $this->getGroups();
$objs = array_merge($subscriptions, $subscribers, $groups, $notices);
Event::handle('AppendUserActivityStreamObjects', array($this, &$objs));
$subscriptions = null;
$subscribers = null;
$groups = null;
unset($subscriptions);
unset($subscribers);
unset($groups);
// Sort by create date
usort($objs, 'UserActivityStream::compareObject');
// We'll keep these around for later, and interleave them into
// the output stream with the user's notices.
$this->objs = $objs;
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}
/**
* Interleave the pre-sorted objects with the user's
* notices, all in reverse chron order.
*/
function renderEntries($format=Feed::ATOM, $handle=null)
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{
$haveOne = false;
$end = time() + 1;
foreach ($this->objs as $obj) {
set_time_limit(10);
try {
$act = $obj->asActivity();
} catch (Exception $e) {
common_log(LOG_ERR, $e->getMessage());
continue;
}
$start = $act->time;
if ($this->outputMode == self::OUTPUT_RAW && $start != $end) {
// In raw mode, we haven't pre-fetched notices.
// Grab the chunks of notices between other activities.
try {
$notices = $this->getNoticesBetween($start, $end);
foreach ($notices as $noticeAct) {
try {
$nact = $noticeAct->asActivity($this->user->getProfile());
if ($format == Feed::ATOM) {
$nact->outputTo($this, false, false);
} else {
if ($haveOne) {
fwrite($handle, ",");
}
fwrite($handle, json_encode($nact->asArray()));
$haveOne = true;
}
} catch (Exception $e) {
common_log(LOG_ERR, $e->getMessage());
continue;
}
$nact = null;
unset($nact);
}
} catch (Exception $e) {
common_log(LOG_ERR, $e->getMessage());
}
}
$notices = null;
unset($notices);
try {
if ($format == Feed::ATOM) {
// Only show the author sub-element if it's different from default user
$act->outputTo($this, false, ($act->actor->id != $this->user->getUri()));
} else {
if ($haveOne) {
fwrite($handle, ",");
}
fwrite($handle, json_encode($act->asArray()));
$haveOne = true;
}
} catch (Exception $e) {
common_log(LOG_ERR, $e->getMessage());
}
$act = null;
unset($act);
$end = $start;
}
if ($this->outputMode == self::OUTPUT_RAW) {
// Grab anything after the last pre-sorted activity.
try {
if (!empty($this->after)) {
$notices = $this->getNoticesBetween($this->after, $end);
} else {
$notices = $this->getNoticesBetween(0, $end);
}
foreach ($notices as $noticeAct) {
try {
$nact = $noticeAct->asActivity($this->user->getProfile());
if ($format == Feed::ATOM) {
$nact->outputTo($this, false, false);
} else {
if ($haveOne) {
fwrite($handle, ",");
}
fwrite($handle, json_encode($nact->asArray()));
$haveOne = true;
}
} catch (Exception $e) {
common_log(LOG_ERR, $e->getMessage());
continue;
}
}
} catch (Exception $e) {
common_log(LOG_ERR, $e->getMessage());
}
}
if (empty($this->after) || strtotime($this->user->created) > $this->after) {
// We always add the registration activity at the end, even if
// they have older activities (from restored backups) in their stream.
try {
$ract = $this->user->registrationActivity();
if ($format == Feed::ATOM) {
$ract->outputTo($this, false, false);
} else {
if ($haveOne) {
fwrite($handle, ",");
}
fwrite($handle, json_encode($ract->asArray()));
$haveOne = true;
}
} catch (Exception $e) {
common_log(LOG_ERR, $e->getMessage());
}
}
}
function compareObject($a, $b)
{
$ac = strtotime((empty($a->created)) ? $a->modified : $a->created);
$bc = strtotime((empty($b->created)) ? $b->modified : $b->created);
return (($ac == $bc) ? 0 : (($ac < $bc) ? 1 : -1));
}
function getSubscriptions()
{
$subs = array();
$sub = new Subscription();
$sub->subscriber = $this->user->id;
if (!empty($this->after)) {
$sub->whereAdd("created > '" . common_sql_date($this->after) . "'");
}
if ($sub->find()) {
while ($sub->fetch()) {
if ($sub->subscribed != $this->user->id) {
$subs[] = clone($sub);
}
}
}
return $subs;
}
function getSubscribers()
{
$subs = array();
$sub = new Subscription();
$sub->subscribed = $this->user->id;
if (!empty($this->after)) {
$sub->whereAdd("created > '" . common_sql_date($this->after) . "'");
}
if ($sub->find()) {
while ($sub->fetch()) {
if ($sub->subscriber != $this->user->id) {
$subs[] = clone($sub);
}
}
}
return $subs;
}
/**
*
* @param int $start unix timestamp for earliest
* @param int $end unix timestamp for latest
* @return array of Notice objects
*/
function getNoticesBetween($start=0, $end=0)
{
$notices = array();
$notice = new Notice();
$notice->profile_id = $this->user->id;
// Only stuff after $this->after
if (!empty($this->after)) {
if ($start) {
$start = max($start, $this->after);
}
if ($end) {
$end = max($end, $this->after);
}
}
if ($start) {
$tsstart = common_sql_date($start);
$notice->whereAdd("created >= '$tsstart'");
}
if ($end) {
$tsend = common_sql_date($end);
$notice->whereAdd("created < '$tsend'");
}
$notice->orderBy('created DESC');
if ($notice->find()) {
while ($notice->fetch()) {
$notices[] = clone($notice);
}
}
return $notices;
}
function getNotices()
{
if (!empty($this->after)) {
return $this->getNoticesBetween($this->after);
} else {
return $this->getNoticesBetween();
}
}
function getGroups()
{
$groups = array();
$gm = new Group_member();
$gm->profile_id = $this->user->id;
if (!empty($this->after)) {
$gm->whereAdd("created > '" . common_sql_date($this->after) . "'");
}
if ($gm->find()) {
while ($gm->fetch()) {
$groups[] = clone($gm);
}
}
return $groups;
}
function createdAfter($item) {
$created = strtotime((empty($item->created)) ? $item->modified : $item->created);
return ($created >= $this->after);
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}
function writeJSON($handle)
{
require_once INSTALLDIR.'/lib/activitystreamjsondocument.php';
fwrite($handle, '{"items": [');
$this->renderEntries(Feed::JSON, $handle);
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fwrite($handle, ']}');
}
}