From 1587b5a0339d485c8b078024269a5d888ac5e652 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Fri, 4 Nov 2016 15:35:25 +0000
Subject: Add initial cut of federation send queue

---
 synapse/federation/send_queue.py | 174 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 174 insertions(+)
 create mode 100644 synapse/federation/send_queue.py

diff --git a/synapse/federation/send_queue.py b/synapse/federation/send_queue.py
new file mode 100644
index 0000000000..3d3c3d98ff
--- /dev/null
+++ b/synapse/federation/send_queue.py
@@ -0,0 +1,174 @@
+# -*- coding: utf-8 -*-
+# Copyright 2014-2016 OpenMarket Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+from blist import sorteddict
+
+
+class FederationRemoteSendQueue(object):
+    def __init__(self, hs):
+        self.clock = hs.get_clock()
+
+        # TODO: Add metrics for size of lists below
+
+        self.presence_map = {}
+        self.presence_changed = sorteddict()
+
+        self.keyed_edu = {}
+        self.keyed_edu_changed = sorteddict()
+
+        self.edus = sorteddict()
+
+        self.failures = sorteddict()
+
+        self.pos = 1
+        self.pos_time = sorteddict()
+
+        self.clock.looping_call(self._clear_queue, 30 * 1000)
+
+    def _next_pos(self):
+        pos = self.pos
+        self.pos += 1
+        self.pos_time[self.clock.time_msec()] = pos
+        return pos
+
+    def _clear_queue(self):
+        # TODO measure this function time.
+
+        FIVE_MINUTES_AGO = 5 * 60 * 1000
+        now = self.clock.time_msec()
+
+        keys = self.pos_time.keys()
+        time = keys.bisect_left(now - FIVE_MINUTES_AGO)
+        if not keys[:time]:
+            return
+
+        position_to_delete = max(keys[:time])
+        for key in keys[:time]:
+            del self.pos_time[key]
+
+        self._clear_queue_before_pos(position_to_delete)
+
+    def _clear_queue_before_pos(self, position_to_delete):
+        # Delete things out of presence maps
+        keys = self.presence_changed.keys()
+        i = keys.bisect_left(position_to_delete)
+        for key in keys[:i]:
+            del self.presence_changed[key]
+
+        user_ids = set()
+        for _, states in self.presence_changed.values():
+            user_ids.update(s.user_id for s in user_ids)
+
+        to_del = [user_id for user_id in self.presence_map if user_id not in user_ids]
+        for user_id in self.to_del:
+            del self.presence_map[user_id]
+
+        # Delete things out of keyed edus
+        keys = self.keyed_edu_changed.keys()
+        i = keys.bisect_left(position_to_delete)
+        for key in keys[:i]:
+            del self.keyed_edu_changed[key]
+
+        live_keys = set()
+        for edu_key in self.keyed_edu_changed.values():
+            live_keys.add(edu_key)
+
+        to_del = [edu_key for edu_key in self.keyed_edu if edu_key not in live_keys]
+        for edu_key in to_del:
+            del self.keyed_edu[edu_key]
+
+        # Delete things out of edu map
+        keys = self.edus.keys()
+        i = keys.bisect_left(position_to_delete)
+        for key in keys[:i]:
+            del self.edus[key]
+
+        # Delete things out of failure map
+        keys = self.failures.keys()
+        i = keys.bisect_left(position_to_delete)
+        for key in keys[:i]:
+            del self.failures[key]
+
+    def send_edu(self, edu, key=None):
+        pos = self._next_pos()
+
+        if key:
+            self.keyed_edu[(edu.destination, key)] = edu
+            self.keyed_edu_changed[pos] = (edu.destination, key)
+        else:
+            self.edus[pos] = edu
+
+    def send_presence(self, destination, states):
+        pos = self._next_pos()
+
+        self.presence_map.presence_map.update({
+            state.user_id: state
+            for state in states
+        })
+
+        self.presence_changed[pos] = (destination, [
+            state.user_id for state in states
+        ])
+
+    def send_failure(self, failure, destination):
+        pos = self._next_pos()
+
+        self.failures[pos] = (destination, failure)
+
+    def notify_new_device_message(self, destination):
+        # TODO
+        pass
+
+    def get_replication_rows(self, token):
+        rows = []
+
+        # Fetch changed presence
+        keys = self.presence_changed.keys()
+        i = keys.bisect_right(token)
+        dest_user_ids = set((k, self.presence_changed[k]) for k in keys[i:])
+
+        for (key, (dest, user_ids)) in dest_user_ids:
+            for user_id in user_ids:
+                rows.append((key, dest, "p", self.presence_map[user_id]))
+
+        # Fetch changes keyed edus
+        keys = self.keyed_edu_changed.keys()
+        i = keys.bisect_right(token)
+        keyed_edus = set((k, self.keyed_edu_changed[k]) for k in keys[i:])
+
+        for (pos, edu_key) in keyed_edus:
+            rows.append((pos, edu_key, "k", self.keyed_edu[edu_key]))
+
+        # Fetch changed edus
+        keys = self.edus.keys()
+        i = keys.bisect_right(token)
+        edus = set((k, self.edus[k]) for k in keys[i:])
+
+        for (pos, edu) in edus:
+            rows.append((pos, edu.destination, "e", edu))
+
+        # Fetch changed failures
+        keys = self.failures.keys()
+        i = keys.bisect_right(token)
+        failures = set((k, self.failures[k]) for k in keys[i:])
+
+        for (pos, (destination, failure)) in failures:
+            rows.append((pos, destination, "f", failure))
+
+        # Sort rows based on pos
+        rows.sort()
+
+        return rows
-- 
cgit 1.4.1