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-rw-r--r--plugins/OStatus/lib/hubprepqueuehandler.php87
1 files changed, 87 insertions, 0 deletions
diff --git a/plugins/OStatus/lib/hubprepqueuehandler.php b/plugins/OStatus/lib/hubprepqueuehandler.php
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index 000000000..0d585938f
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+++ b/plugins/OStatus/lib/hubprepqueuehandler.php
@@ -0,0 +1,87 @@
+<?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/>.
+ */
+
+/**
+ * When we have a large batch of PuSH consumers, we break the data set
+ * into smaller chunks. Enqueue final destinations...
+ *
+ * @package Hub
+ * @author Brion Vibber <brion@status.net>
+ */
+class HubPrepQueueHandler extends QueueHandler
+{
+ // Enqueue this many low-level distributions before re-queueing the rest
+ // of the batch to be processed later. Helps to keep latency down for other
+ // things happening during a particularly long OStatus delivery session.
+ //
+ // [Could probably ditch this if we had working message delivery priorities
+ // for queueing, but this isn't supported in ActiveMQ 5.3.]
+ const ROLLING_BATCH = 20;
+
+ function transport()
+ {
+ return 'hubprep';
+ }
+
+ function handle($data)
+ {
+ $topic = $data['topic'];
+ $atom = $data['atom'];
+ $pushCallbacks = $data['pushCallbacks'];
+
+ assert(is_string($atom));
+ assert(is_string($topic));
+ assert(is_array($pushCallbacks));
+
+ // Set up distribution for the first n subscribing sites...
+ // If we encounter an uncatchable error, queue handling should
+ // automatically re-run the batch, which could lead to some dupe
+ // distributions.
+ //
+ // Worst case is if one of these hubprep entries dies too many
+ // times and gets dropped; the rest of the batch won't get processed.
+ try {
+ $n = 0;
+ while (count($pushCallbacks) && $n < self::ROLLING_BATCH) {
+ $n++;
+ $callback = array_shift($pushCallbacks);
+ $sub = HubSub::staticGet($topic, $callback);
+ if (!$sub) {
+ common_log(LOG_ERR, "Skipping PuSH delivery for deleted(?) consumer $callback on $topic");
+ continue;
+ }
+
+ $sub->distribute($atom);
+ }
+ } catch (Exception $e) {
+ common_log(LOG_ERR, "Exception during PuSH batch out: " .
+ $e->getMessage() .
+ " prepping $topic to $callback");
+ }
+
+ // And re-queue the rest of the batch!
+ if (count($pushCallbacks) > 0) {
+ $sub = new HubSub();
+ $sub->topic = $topic;
+ $sub->bulkDistribute($atom, $pushCallbacks);
+ }
+
+ return true;
+ }
+}