Work in progress: starting on new TwitterDaemon using the Site Streams API -- code...

diff --git a/plugins/TwitterBridge/daemons/twitterdaemon.php b/plugins/TwitterBridge/daemons/twitterdaemon.php
new file mode 100644 (file)
index 0000000..f97f317
--- /dev/null
+++ b/plugins/TwitterBridge/daemons/twitterdaemon.php
@@ -0,0 +1,327 @@
+#!/usr/bin/env php
+<?php
+/*
+ * StatusNet - the distributed open-source microblogging tool
+ * Copyright (C) 2008-2010, 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/>.
+ */
+
+define('INSTALLDIR', realpath(dirname(__FILE__) . '/..'));
+
+$shortoptions = 'fi::a';
+$longoptions = array('id::', 'foreground', 'all');
+
+$helptext = <<<END_OF_XMPP_HELP
+Daemon script for receiving new notices from Twitter users.
+
+    -i --id           Identity (default none)
+    -a --all          Handle Twitter for all local sites
+                      (requires Stomp queue handler, status_network setup)
+    -f --foreground   Stay in the foreground (default background)
+
+END_OF_XMPP_HELP;
+
+require_once INSTALLDIR.'/scripts/commandline.inc';
+
+require_once INSTALLDIR . '/lib/jabber.php';
+
+class TwitterDaemon extends SpawningDaemon
+{
+    protected $allsites = false;
+
+    function __construct($id=null, $daemonize=true, $threads=1, $allsites=false)
+    {
+        if ($threads != 1) {
+            // This should never happen. :)
+            throw new Exception("TwitterDaemon must run single-threaded");
+        }
+        parent::__construct($id, $daemonize, $threads);
+        $this->allsites = $allsites;
+    }
+
+    function runThread()
+    {
+        common_log(LOG_INFO, 'Waiting to listen to Twitter and queues');
+
+        $master = new TwitterMaster($this->get_id(), $this->processManager());
+        $master->init($this->allsites);
+        $master->service();
+
+        common_log(LOG_INFO, 'terminating normally');
+
+        return $master->respawn ? self::EXIT_RESTART : self::EXIT_SHUTDOWN;
+    }
+
+}
+
+class TwitterMaster extends IoMaster
+{
+    protected $processManager;
+
+    function __construct($id, $processManager)
+    {
+        parent::__construct($id);
+        $this->processManager = $processManager;
+    }
+
+    /**
+     * Initialize IoManagers for the currently configured site
+     * which are appropriate to this instance.
+     */
+    function initManagers()
+    {
+        if (common_config('twitter', 'enabled')) {
+            $qm = QueueManager::get();
+            $qm->setActiveGroup('twitter');
+            $this->instantiate($qm);
+            $this->instantiate(TwitterManager::get());
+            $this->instantiate($this->processManager);
+        }
+    }
+}
+
+
+class TwitterManager extends IoManager
+{
+    // Recommended resource limits from http://dev.twitter.com/pages/site_streams
+    const MAX_STREAMS = 1000;
+    const USERS_PER_STREAM = 100;
+    const STREAMS_PER_SECOND = 20;
+
+    protected $twitterStreams;
+    protected $twitterUsers;
+
+    function __construct()
+    {
+    }
+
+    /**
+     * Pull the site's active Twitter-importing users and start spawning
+     * some data streams for them!
+     *
+     * @fixme check their last-id and check whether we'll need to do a manual pull.
+     * @fixme abstract out the fetching so we can work over multiple sites.
+     */
+    function initStreams()
+    {
+        // Pull Twitter user IDs for all users we want to pull data for
+        $flink = new Foreign_link();
+        $flink->service = TWITTER_SERVICE;
+        // @fixme probably should do the bitfield check in a whereAdd but it's ugly :D
+        $flink->find();
+
+        $userIds = array();
+        while ($flink->fetch()) {
+            if (($flink->noticesync & FOREIGN_NOTICE_RECV) ==
+                FOREIGN_NOTICE_RECV) {
+                $userIds[] = $flink->foreign_id;
+
+                if (count($userIds) >= self::USERS_PER_STREAM) {
+                    $this->spawnStream($userIds);
+                    $userIds = array();
+                }
+            }
+        }
+
+        if (count($userIds)) {
+            $this->spawnStream($userIds);
+        }
+    }
+
+    /**
+     * Prepare a Site Stream connection for the given chunk of users.
+     * The actual connection will be opened later.
+     *
+     * @param $users array of Twitter-side user IDs
+     */
+    function spawnStream($users)
+    {
+        $stream = $this->initSiteStream();
+        $stream->followUsers($userIds);
+
+        // Slip the stream reader into our list of active streams.
+        // We'll manage its actual connection on the next go-around.
+        $this->streams[] = $stream;
+
+        // Record the user->stream mappings; this makes it easier for us to know
+        // later if we need to kill something.
+        foreach ($userIds as $id) {
+            $this->users[$id] = $stream;
+        }
+    }
+
+    /**
+     * Initialize a generic site streams connection object.
+     * All our connections will look like this, then we'll add users to them.
+     *
+     * @return TwitterStreamReader
+     */
+    function initSiteStream()
+    {
+        $auth = $this->siteStreamAuth();
+        $stream = new TwitterSiteStream($auth);
+
+        // Add our event handler callbacks. Whee!
+        $this->setupEvents($stream);
+        return $stream;
+    }
+
+    /**
+     * Fetch the Twitter OAuth credentials to use to connect to the Site Streams API.
+     *
+     * This will use the locally-stored credentials for the applictation's owner account
+     * from the site configuration. These should be configured through the administration
+     * panels or manually in the config file.
+     *
+     * Will throw an exception if no credentials can be found -- but beware that invalid
+     * credentials won't cause breakage until later.
+     *
+     * @return TwitterOAuthClient
+     */
+    function siteStreamAuth()
+    {
+        $token = common_config('twitter', 'stream_token');
+        $secret = common_config('twitter', 'stream_secret');
+        if (empty($token) || empty($secret)) {
+            throw new ServerException('Twitter site streams have not been correctly configured. Configure the app owner account via the admin panel.');
+        }
+        return new TwitterOAuthClient($token, $secret);
+    }
+
+    /**
+     * Collect the sockets for all active connections for i/o monitoring.
+     *
+     * @return array of resources
+     */
+    function getSockets()
+    {
+        $sockets = array();
+        foreach ($this->streams as $stream) {
+            foreach ($stream->getSockets() as $socket) {
+                $sockets[] = $socket;
+            }
+        }
+        return $streams;
+    }
+
+    /**
+     * We're ready to process input from one of our data sources! Woooooo!
+     * @fixme is there an easier way to map from socket back to owning module? :(
+     *
+     * @param resource $socket
+     * @return boolean success
+     */
+    function handleInput($socket)
+    {
+        foreach ($this->streams as $stream) {
+            foreach ($stream->getSockets() as $aSocket) {
+                if ($socket === $aSocket) {
+                    $stream->handleInput($socket);
+                }
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Start the system up!
+     * @fixme do some rate-limiting on the stream setup
+     * @fixme do some sensible backoff on failure etc
+     */
+    function start()
+    {
+        $this->initStreams();
+        foreach ($this->streams as $stream) {
+            $stream->connect();
+        }
+        return true;
+    }
+
+    function finish()
+    {
+        foreach ($this->streams as $index => $stream) {
+            $stream->close();
+            unset($this->streams[$index]);
+        }
+        return true;
+    }
+
+    public static function get()
+    {
+        throw new Exception('not a singleton');
+    }
+
+    /**
+     * Set up event handlers on the streaming interface.
+     *
+     * @fixme add more event types as we add handling for them
+     */
+    protected function setupEvents(TwitterStream $stream)
+    {
+        $handlers = array(
+            'status',
+        );
+        foreach ($handlers as $event) {
+            $stream->hookEvent($event, array($this, 'onTwitter' . ucfirst($event)));
+        }
+    }
+
+    /**
+     * Event callback notifying that a user has a new message in their home timeline.
+     *
+     * @param object $data JSON data: Twitter status update
+     */
+    protected function onTwitterStatus($data, $context)
+    {
+        $importer = new TwitterImport();
+        $notice = $importer->importStatus($data);
+        if ($notice) {
+            $user = $this->getTwitterUser($context);
+            Inbox::insertNotice($user->id, $notice->id);
+        }
+    }
+
+    /**
+     * @fixme what about handling multiple sites?
+     */
+    function getTwitterUser($context)
+    {
+        if ($context->source != 'sitestream') {
+            throw new ServerException("Unexpected stream source");
+        }
+        $flink = Foreign_link::getByForeignID(TWITTER_SERVICE, $context->for_user);
+        if ($flink) {
+            return $flink->getUser();
+        } else {
+            throw new ServerException("No local user for this Twitter ID");
+        }
+    }
+}
+
+
+if (have_option('i', 'id')) {
+    $id = get_option_value('i', 'id');
+} else if (count($args) > 0) {
+    $id = $args[0];
+} else {
+    $id = null;
+}
+
+$foreground = have_option('f', 'foreground');
+$all = have_option('a') || have_option('--all');
+
+$daemon = new TwitterDaemon($id, !$foreground, 1, $all);
+
+$daemon->runOnce();