summary refs log tree commit diff
path: root/synapse/push/pusherpool.py
blob: 3c3262a88c53d7b1403912ce249d3b481dc36292 (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
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright 2015, 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.

import logging
from typing import TYPE_CHECKING, Dict, Union

from prometheus_client import Gauge

from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.push import PusherConfigException
from synapse.push.emailpusher import EmailPusher
from synapse.push.httppusher import HttpPusher
from synapse.push.pusher import PusherFactory
from synapse.util.async_helpers import concurrently_execute

if TYPE_CHECKING:
    from synapse.server import HomeServer


logger = logging.getLogger(__name__)


synapse_pushers = Gauge(
    "synapse_pushers", "Number of active synapse pushers", ["kind", "app_id"]
)


class PusherPool:
    """
    The pusher pool. This is responsible for dispatching notifications of new events to
    the http and email pushers.

    It provides three methods which are designed to be called by the rest of the
    application: `start`, `on_new_notifications`, and `on_new_receipts`: each of these
    delegates to each of the relevant pushers.

    Note that it is expected that each pusher will have its own 'processing' loop which
    will send out the notifications in the background, rather than blocking until the
    notifications are sent; accordingly Pusher.on_started, Pusher.on_new_notifications and
    Pusher.on_new_receipts are not expected to return awaitables.
    """

    def __init__(self, hs: "HomeServer"):
        self.hs = hs
        self.pusher_factory = PusherFactory(hs)
        self._should_start_pushers = hs.config.start_pushers
        self.store = self.hs.get_datastore()
        self.clock = self.hs.get_clock()

        # We shard the handling of push notifications by user ID.
        self._pusher_shard_config = hs.config.push.pusher_shard_config
        self._instance_name = hs.get_instance_name()

        # map from user id to app_id:pushkey to pusher
        self.pushers = {}  # type: Dict[str, Dict[str, Union[HttpPusher, EmailPusher]]]

    def start(self):
        """Starts the pushers off in a background process.
        """
        if not self._should_start_pushers:
            logger.info("Not starting pushers because they are disabled in the config")
            return
        run_as_background_process("start_pushers", self._start_pushers)

    async def add_pusher(
        self,
        user_id,
        access_token,
        kind,
        app_id,
        app_display_name,
        device_display_name,
        pushkey,
        lang,
        data,
        profile_tag="",
    ):
        """Creates a new pusher and adds it to the pool

        Returns:
            EmailPusher|HttpPusher
        """

        time_now_msec = self.clock.time_msec()

        # we try to create the pusher just to validate the config: it
        # will then get pulled out of the database,
        # recreated, added and started: this means we have only one
        # code path adding pushers.
        self.pusher_factory.create_pusher(
            {
                "id": None,
                "user_name": user_id,
                "kind": kind,
                "app_id": app_id,
                "app_display_name": app_display_name,
                "device_display_name": device_display_name,
                "pushkey": pushkey,
                "ts": time_now_msec,
                "lang": lang,
                "data": data,
                "last_stream_ordering": None,
                "last_success": None,
                "failing_since": None,
            }
        )

        # create the pusher setting last_stream_ordering to the current maximum
        # stream ordering in event_push_actions, so it will process
        # pushes from this point onwards.
        last_stream_ordering = await self.store.get_latest_push_action_stream_ordering()

        await self.store.add_pusher(
            user_id=user_id,
            access_token=access_token,
            kind=kind,
            app_id=app_id,
            app_display_name=app_display_name,
            device_display_name=device_display_name,
            pushkey=pushkey,
            pushkey_ts=time_now_msec,
            lang=lang,
            data=data,
            last_stream_ordering=last_stream_ordering,
            profile_tag=profile_tag,
        )
        pusher = await self.start_pusher_by_id(app_id, pushkey, user_id)

        return pusher

    async def remove_pushers_by_app_id_and_pushkey_not_user(
        self, app_id, pushkey, not_user_id
    ):
        to_remove = await self.store.get_pushers_by_app_id_and_pushkey(app_id, pushkey)
        for p in to_remove:
            if p["user_name"] != not_user_id:
                logger.info(
                    "Removing pusher for app id %s, pushkey %s, user %s",
                    app_id,
                    pushkey,
                    p["user_name"],
                )
                await self.remove_pusher(p["app_id"], p["pushkey"], p["user_name"])

    async def remove_pushers_by_access_token(self, user_id, access_tokens):
        """Remove the pushers for a given user corresponding to a set of
        access_tokens.

        Args:
            user_id (str): user to remove pushers for
            access_tokens (Iterable[int]): access token *ids* to remove pushers
                for
        """
        if not self._pusher_shard_config.should_handle(self._instance_name, user_id):
            return

        tokens = set(access_tokens)
        for p in await self.store.get_pushers_by_user_id(user_id):
            if p["access_token"] in tokens:
                logger.info(
                    "Removing pusher for app id %s, pushkey %s, user %s",
                    p["app_id"],
                    p["pushkey"],
                    p["user_name"],
                )
                await self.remove_pusher(p["app_id"], p["pushkey"], p["user_name"])

    async def on_new_notifications(self, min_stream_id, max_stream_id):
        if not self.pushers:
            # nothing to do here.
            return

        try:
            users_affected = await self.store.get_push_action_users_in_range(
                min_stream_id, max_stream_id
            )

            for u in users_affected:
                if u in self.pushers:
                    for p in self.pushers[u].values():
                        p.on_new_notifications(min_stream_id, max_stream_id)

        except Exception:
            logger.exception("Exception in pusher on_new_notifications")

    async def on_new_receipts(self, min_stream_id, max_stream_id, affected_room_ids):
        if not self.pushers:
            # nothing to do here.
            return

        try:
            # Need to subtract 1 from the minimum because the lower bound here
            # is not inclusive
            users_affected = await self.store.get_users_sent_receipts_between(
                min_stream_id - 1, max_stream_id
            )

            for u in users_affected:
                if u in self.pushers:
                    for p in self.pushers[u].values():
                        p.on_new_receipts(min_stream_id, max_stream_id)

        except Exception:
            logger.exception("Exception in pusher on_new_receipts")

    async def start_pusher_by_id(self, app_id, pushkey, user_id):
        """Look up the details for the given pusher, and start it

        Returns:
            EmailPusher|HttpPusher|None: The pusher started, if any
        """
        if not self._should_start_pushers:
            return

        if not self._pusher_shard_config.should_handle(self._instance_name, user_id):
            return

        resultlist = await self.store.get_pushers_by_app_id_and_pushkey(app_id, pushkey)

        pusher_dict = None
        for r in resultlist:
            if r["user_name"] == user_id:
                pusher_dict = r

        pusher = None
        if pusher_dict:
            pusher = await self._start_pusher(pusher_dict)

        return pusher

    async def _start_pushers(self) -> None:
        """Start all the pushers
        """
        pushers = await self.store.get_all_pushers()

        # Stagger starting up the pushers so we don't completely drown the
        # process on start up.
        await concurrently_execute(self._start_pusher, pushers, 10)

        logger.info("Started pushers")

    async def _start_pusher(self, pusherdict):
        """Start the given pusher

        Args:
            pusherdict (dict): dict with the values pulled from the db table

        Returns:
            EmailPusher|HttpPusher
        """
        if not self._pusher_shard_config.should_handle(
            self._instance_name, pusherdict["user_name"]
        ):
            return

        try:
            p = self.pusher_factory.create_pusher(pusherdict)
        except PusherConfigException as e:
            logger.warning(
                "Pusher incorrectly configured id=%i, user=%s, appid=%s, pushkey=%s: %s",
                pusherdict["id"],
                pusherdict.get("user_name"),
                pusherdict.get("app_id"),
                pusherdict.get("pushkey"),
                e,
            )
            return
        except Exception:
            logger.exception(
                "Couldn't start pusher id %i: caught Exception", pusherdict["id"],
            )
            return

        if not p:
            return

        appid_pushkey = "%s:%s" % (pusherdict["app_id"], pusherdict["pushkey"])

        byuser = self.pushers.setdefault(pusherdict["user_name"], {})
        if appid_pushkey in byuser:
            byuser[appid_pushkey].on_stop()
        byuser[appid_pushkey] = p

        synapse_pushers.labels(type(p).__name__, p.app_id).inc()

        # Check if there *may* be push to process. We do this as this check is a
        # lot cheaper to do than actually fetching the exact rows we need to
        # push.
        user_id = pusherdict["user_name"]
        last_stream_ordering = pusherdict["last_stream_ordering"]
        if last_stream_ordering:
            have_notifs = await self.store.get_if_maybe_push_in_range_for_user(
                user_id, last_stream_ordering
            )
        else:
            # We always want to default to starting up the pusher rather than
            # risk missing push.
            have_notifs = True

        p.on_started(have_notifs)

        return p

    async def remove_pusher(self, app_id, pushkey, user_id):
        appid_pushkey = "%s:%s" % (app_id, pushkey)

        byuser = self.pushers.get(user_id, {})

        if appid_pushkey in byuser:
            logger.info("Stopping pusher %s / %s", user_id, appid_pushkey)
            pusher = byuser.pop(appid_pushkey)
            pusher.on_stop()

            synapse_pushers.labels(type(pusher).__name__, pusher.app_id).dec()

        await self.store.delete_pusher_by_app_id_pushkey_user_id(
            app_id, pushkey, user_id
        )