summary refs log tree commit diff
path: root/synapse/federation/send_queue.py
blob: ed2b03fad452c661fe07b3545a9b33b6b13f85e1 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
# -*- 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.

"""A federation sender that forwards things to be sent across replication to
a worker process.

It assumes there is a single worker process feeding off of it.

Each row in the replication stream consists of a type and some json, where the
types indicate whether they are presence, or edus, etc.

Ephemeral or non-event data are queued up in-memory. When the worker requests
updates since a particular point, all in-memory data since before that point is
dropped. We also expire things in the queue after 5 minutes, to ensure that a
dead worker doesn't cause the queues to grow limitlessly.

Events are replicated via a separate events stream.
"""

from .units import Edu

from synapse.util.metrics import Measure
import synapse.metrics

from blist import sorteddict
import ujson


metrics = synapse.metrics.get_metrics_for(__name__)


PRESENCE_TYPE = "p"
KEYED_EDU_TYPE = "k"
EDU_TYPE = "e"
FAILURE_TYPE = "f"
DEVICE_MESSAGE_TYPE = "d"


class FederationRemoteSendQueue(object):
    """A drop in replacement for TransactionQueue"""

    def __init__(self, hs):
        self.server_name = hs.hostname
        self.clock = hs.get_clock()

        self.presence_map = {}
        self.presence_changed = sorteddict()

        self.keyed_edu = {}
        self.keyed_edu_changed = sorteddict()

        self.edus = sorteddict()

        self.failures = sorteddict()

        self.device_messages = sorteddict()

        self.pos = 1
        self.pos_time = sorteddict()

        # EVERYTHING IS SAD. In particular, python only makes new scopes when
        # we make a new function, so we need to make a new function so the inner
        # lambda binds to the queue rather than to the name of the queue which
        # changes. ARGH.
        def register(name, queue):
            metrics.register_callback(
                queue_name + "_size",
                lambda: len(queue),
            )

        for queue_name in [
            "presence_map", "presence_changed", "keyed_edu", "keyed_edu_changed",
            "edus", "failures", "device_messages", "pos_time",
        ]:
            register(queue_name, getattr(self, queue_name))

        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):
        """Clear the queues for anything older than N minutes"""

        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):
        """Clear all the queues from before a given position"""
        with Measure(self.clock, "send_queue._clear"):
            # 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(
                user_id for uids in self.presence_changed.values() for _, user_id in uids
            )

            to_del = [
                user_id for user_id in self.presence_map if user_id not in user_ids
            ]
            for user_id in 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]

            # Delete things out of device map
            keys = self.device_messages.keys()
            i = keys.bisect_left(position_to_delete)
            for key in keys[:i]:
                del self.device_messages[key]

    def notify_new_events(self, current_id):
        """As per TransactionQueue"""
        # We don't need to replicate this as it gets sent down a different
        # stream.
        pass

    def send_edu(self, destination, edu_type, content, key=None):
        """As per TransactionQueue"""
        pos = self._next_pos()

        edu = Edu(
            origin=self.server_name,
            destination=destination,
            edu_type=edu_type,
            content=content,
        )

        if key:
            assert isinstance(key, tuple)
            self.keyed_edu[(destination, key)] = edu
            self.keyed_edu_changed[pos] = (destination, key)
        else:
            self.edus[pos] = edu

    def send_presence(self, destination, states):
        """As per TransactionQueue"""
        pos = self._next_pos()

        self.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):
        """As per TransactionQueue"""
        pos = self._next_pos()

        self.failures[pos] = (destination, str(failure))

    def send_device_messages(self, destination):
        """As per TransactionQueue"""
        pos = self._next_pos()
        self.device_messages[pos] = destination

    def get_current_token(self):
        return self.pos - 1

    def get_replication_rows(self, token, limit):
        # TODO: Handle limit.

        # To handle restarts where we wrap around
        if token > self.pos:
            token = -1

        rows = []

        # There should be only one reader, so lets delete everything its
        # acknowledged its seen.
        self._clear_queue_before_pos(token)

        # Fetch changed presence
        keys = self.presence_changed.keys()
        i = keys.bisect_right(token)
        dest_user_ids = set(
            (pos, dest_user_id)
            for pos in keys[i:]
            for dest_user_id in self.presence_changed[pos]
        )

        for (key, (dest, user_id)) in dest_user_ids:
            rows.append((key, PRESENCE_TYPE, ujson.dumps({
                "destination": dest,
                "state": self.presence_map[user_id].as_dict(),
            })))

        # 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, (destination, edu_key)) in keyed_edus:
            rows.append(
                (pos, KEYED_EDU_TYPE, ujson.dumps({
                    "key": edu_key,
                    "edu": self.keyed_edu[(destination, edu_key)].get_internal_dict(),
                }))
            )

        # 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_TYPE, ujson.dumps(edu.get_internal_dict())))

        # 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, FAILURE_TYPE, ujson.dumps({
                "destination": destination,
                "failure": failure,
            })))

        # Fetch changed device messages
        keys = self.device_messages.keys()
        i = keys.bisect_right(token)
        device_messages = set((k, self.device_messages[k]) for k in keys[i:])

        for (pos, destination) in device_messages:
            rows.append((pos, DEVICE_MESSAGE_TYPE, ujson.dumps({
                "destination": destination,
            })))

        # Sort rows based on pos
        rows.sort()

        return rows