summary refs log tree commit diff
path: root/synapse/push/httppusher.py
blob: cc266a820762a6813b23c2d2a24c9e62ac676ee2 (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
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
# -*- coding: utf-8 -*-
# Copyright 2015, 2016 OpenMarket Ltd
# Copyright 2017 New Vector 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

import six

from prometheus_client import Counter

from twisted.internet import defer
from twisted.internet.error import AlreadyCalled, AlreadyCancelled

from synapse.logging import opentracing
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.push import PusherConfigException

from . import push_rule_evaluator, push_tools

if six.PY3:
    long = int

logger = logging.getLogger(__name__)

http_push_processed_counter = Counter(
    "synapse_http_httppusher_http_pushes_processed",
    "Number of push notifications successfully sent",
)

http_push_failed_counter = Counter(
    "synapse_http_httppusher_http_pushes_failed",
    "Number of push notifications which failed",
)

http_badges_processed_counter = Counter(
    "synapse_http_httppusher_badge_updates_processed",
    "Number of badge updates successfully sent",
)

http_badges_failed_counter = Counter(
    "synapse_http_httppusher_badge_updates_failed",
    "Number of badge updates which failed",
)


class HttpPusher(object):
    INITIAL_BACKOFF_SEC = 1  # in seconds because that's what Twisted takes
    MAX_BACKOFF_SEC = 60 * 60

    # This one's in ms because we compare it against the clock
    GIVE_UP_AFTER_MS = 24 * 60 * 60 * 1000

    def __init__(self, hs, pusherdict):
        self.hs = hs
        self.store = self.hs.get_datastore()
        self.storage = self.hs.get_storage()
        self.clock = self.hs.get_clock()
        self.state_handler = self.hs.get_state_handler()
        self.user_id = pusherdict["user_name"]
        self.app_id = pusherdict["app_id"]
        self.app_display_name = pusherdict["app_display_name"]
        self.device_display_name = pusherdict["device_display_name"]
        self.pushkey = pusherdict["pushkey"]
        self.pushkey_ts = pusherdict["ts"]
        self.data = pusherdict["data"]
        self.last_stream_ordering = pusherdict["last_stream_ordering"]
        self.backoff_delay = HttpPusher.INITIAL_BACKOFF_SEC
        self.failing_since = pusherdict["failing_since"]
        self.timed_call = None
        self._is_processing = False

        # This is the highest stream ordering we know it's safe to process.
        # When new events arrive, we'll be given a window of new events: we
        # should honour this rather than just looking for anything higher
        # because of potential out-of-order event serialisation. This starts
        # off as None though as we don't know any better.
        self.max_stream_ordering = None

        if "data" not in pusherdict:
            raise PusherConfigException("No 'data' key for HTTP pusher")
        self.data = pusherdict["data"]

        self.name = "%s/%s/%s" % (
            pusherdict["user_name"],
            pusherdict["app_id"],
            pusherdict["pushkey"],
        )

        if self.data is None:
            raise PusherConfigException("data can not be null for HTTP pusher")

        if "url" not in self.data:
            raise PusherConfigException("'url' required in data for HTTP pusher")
        self.url = self.data["url"]
        self.http_client = hs.get_proxied_http_client()
        self.data_minus_url = {}
        self.data_minus_url.update(self.data)
        del self.data_minus_url["url"]

    def on_started(self, should_check_for_notifs):
        """Called when this pusher has been started.

        Args:
            should_check_for_notifs (bool): Whether we should immediately
                check for push to send. Set to False only if it's known there
                is nothing to send
        """
        if should_check_for_notifs:
            self._start_processing()

    def on_new_notifications(self, min_stream_ordering, max_stream_ordering):
        self.max_stream_ordering = max(
            max_stream_ordering, self.max_stream_ordering or 0
        )
        self._start_processing()

    def on_new_receipts(self, min_stream_id, max_stream_id):
        # Note that the min here shouldn't be relied upon to be accurate.

        # We could check the receipts are actually m.read receipts here,
        # but currently that's the only type of receipt anyway...
        run_as_background_process("http_pusher.on_new_receipts", self._update_badge)

    @defer.inlineCallbacks
    def _update_badge(self):
        badge = yield push_tools.get_badge_count(self.hs.get_datastore(), self.user_id)
        yield self._send_badge(badge)

    def on_timer(self):
        self._start_processing()

    def on_stop(self):
        if self.timed_call:
            try:
                self.timed_call.cancel()
            except (AlreadyCalled, AlreadyCancelled):
                pass
            self.timed_call = None

    def _start_processing(self):
        if self._is_processing:
            return

        run_as_background_process("httppush.process", self._process)

    @defer.inlineCallbacks
    def _process(self):
        # we should never get here if we are already processing
        assert not self._is_processing

        try:
            self._is_processing = True
            # if the max ordering changes while we're running _unsafe_process,
            # call it again, and so on until we've caught up.
            while True:
                starting_max_ordering = self.max_stream_ordering
                try:
                    yield self._unsafe_process()
                except Exception:
                    logger.exception("Exception processing notifs")
                if self.max_stream_ordering == starting_max_ordering:
                    break
        finally:
            self._is_processing = False

    @defer.inlineCallbacks
    def _unsafe_process(self):
        """
        Looks for unset notifications and dispatch them, in order
        Never call this directly: use _process which will only allow this to
        run once per pusher.
        """

        fn = self.store.get_unread_push_actions_for_user_in_range_for_http
        unprocessed = yield fn(
            self.user_id, self.last_stream_ordering, self.max_stream_ordering
        )

        logger.info(
            "Processing %i unprocessed push actions for %s starting at "
            "stream_ordering %s",
            len(unprocessed),
            self.name,
            self.last_stream_ordering,
        )

        for push_action in unprocessed:
            with opentracing.start_active_span(
                "http-push",
                tags={
                    "authenticated_entity": self.user_id,
                    "event_id": push_action["event_id"],
                    "app_id": self.app_id,
                    "app_display_name": self.app_display_name,
                },
            ):
                processed = yield self._process_one(push_action)

            if processed:
                http_push_processed_counter.inc()
                self.backoff_delay = HttpPusher.INITIAL_BACKOFF_SEC
                self.last_stream_ordering = push_action["stream_ordering"]
                pusher_still_exists = yield self.store.update_pusher_last_stream_ordering_and_success(
                    self.app_id,
                    self.pushkey,
                    self.user_id,
                    self.last_stream_ordering,
                    self.clock.time_msec(),
                )
                if not pusher_still_exists:
                    # The pusher has been deleted while we were processing, so
                    # lets just stop and return.
                    self.on_stop()
                    return

                if self.failing_since:
                    self.failing_since = None
                    yield self.store.update_pusher_failing_since(
                        self.app_id, self.pushkey, self.user_id, self.failing_since
                    )
            else:
                http_push_failed_counter.inc()
                if not self.failing_since:
                    self.failing_since = self.clock.time_msec()
                    yield self.store.update_pusher_failing_since(
                        self.app_id, self.pushkey, self.user_id, self.failing_since
                    )

                if (
                    self.failing_since
                    and self.failing_since
                    < self.clock.time_msec() - HttpPusher.GIVE_UP_AFTER_MS
                ):
                    # we really only give up so that if the URL gets
                    # fixed, we don't suddenly deliver a load
                    # of old notifications.
                    logger.warning(
                        "Giving up on a notification to user %s, pushkey %s",
                        self.user_id,
                        self.pushkey,
                    )
                    self.backoff_delay = HttpPusher.INITIAL_BACKOFF_SEC
                    self.last_stream_ordering = push_action["stream_ordering"]
                    pusher_still_exists = yield self.store.update_pusher_last_stream_ordering(
                        self.app_id,
                        self.pushkey,
                        self.user_id,
                        self.last_stream_ordering,
                    )
                    if not pusher_still_exists:
                        # The pusher has been deleted while we were processing, so
                        # lets just stop and return.
                        self.on_stop()
                        return

                    self.failing_since = None
                    yield self.store.update_pusher_failing_since(
                        self.app_id, self.pushkey, self.user_id, self.failing_since
                    )
                else:
                    logger.info("Push failed: delaying for %ds", self.backoff_delay)
                    self.timed_call = self.hs.get_reactor().callLater(
                        self.backoff_delay, self.on_timer
                    )
                    self.backoff_delay = min(
                        self.backoff_delay * 2, self.MAX_BACKOFF_SEC
                    )
                    break

    @defer.inlineCallbacks
    def _process_one(self, push_action):
        if "notify" not in push_action["actions"]:
            return True

        tweaks = push_rule_evaluator.tweaks_for_actions(push_action["actions"])
        badge = yield push_tools.get_badge_count(self.hs.get_datastore(), self.user_id)

        event = yield self.store.get_event(push_action["event_id"], allow_none=True)
        if event is None:
            return True  # It's been redacted
        rejected = yield self.dispatch_push(event, tweaks, badge)
        if rejected is False:
            return False

        if isinstance(rejected, list) or isinstance(rejected, tuple):
            for pk in rejected:
                if pk != self.pushkey:
                    # for sanity, we only remove the pushkey if it
                    # was the one we actually sent...
                    logger.warning(
                        ("Ignoring rejected pushkey %s because we didn't send it"), pk,
                    )
                else:
                    logger.info("Pushkey %s was rejected: removing", pk)
                    yield self.hs.remove_pusher(self.app_id, pk, self.user_id)
        return True

    @defer.inlineCallbacks
    def _build_notification_dict(self, event, tweaks, badge):
        if self.data.get("format") == "event_id_only":
            d = {
                "notification": {
                    "event_id": event.event_id,
                    "room_id": event.room_id,
                    "counts": {"unread": badge},
                    "devices": [
                        {
                            "app_id": self.app_id,
                            "pushkey": self.pushkey,
                            "pushkey_ts": long(self.pushkey_ts / 1000),
                            "data": self.data_minus_url,
                        }
                    ],
                }
            }
            return d

        ctx = yield push_tools.get_context_for_event(
            self.storage, self.state_handler, event, self.user_id
        )

        d = {
            "notification": {
                "id": event.event_id,  # deprecated: remove soon
                "event_id": event.event_id,
                "room_id": event.room_id,
                "type": event.type,
                "sender": event.user_id,
                "counts": {  # -- we don't mark messages as read yet so
                    # we have no way of knowing
                    # Just set the badge to 1 until we have read receipts
                    "unread": badge,
                    # 'missed_calls': 2
                },
                "devices": [
                    {
                        "app_id": self.app_id,
                        "pushkey": self.pushkey,
                        "pushkey_ts": long(self.pushkey_ts / 1000),
                        "data": self.data_minus_url,
                        "tweaks": tweaks,
                    }
                ],
            }
        }
        if event.type == "m.room.member" and event.is_state():
            d["notification"]["membership"] = event.content["membership"]
            d["notification"]["user_is_target"] = event.state_key == self.user_id
        if self.hs.config.push_include_content and event.content:
            d["notification"]["content"] = event.content

        # We no longer send aliases separately, instead, we send the human
        # readable name of the room, which may be an alias.
        if "sender_display_name" in ctx and len(ctx["sender_display_name"]) > 0:
            d["notification"]["sender_display_name"] = ctx["sender_display_name"]
        if "name" in ctx and len(ctx["name"]) > 0:
            d["notification"]["room_name"] = ctx["name"]

        return d

    @defer.inlineCallbacks
    def dispatch_push(self, event, tweaks, badge):
        notification_dict = yield self._build_notification_dict(event, tweaks, badge)
        if not notification_dict:
            return []
        try:
            logger.info("SENDING PUSH EVENT to %s: %s", self.url, notification_dict)
            resp = yield self.http_client.post_json_get_json(
                self.url, notification_dict
            )
        except Exception as e:
            logger.warning(
                "Failed to push event %s to %s: %s %s",
                event.event_id,
                self.name,
                type(e),
                e,
            )
            return False
        rejected = []
        if "rejected" in resp:
            rejected = resp["rejected"]
        return rejected

    @defer.inlineCallbacks
    def _send_badge(self, badge):
        """
        Args:
            badge (int): number of unread messages
        """
        logger.debug("Sending updated badge count %d to %s", badge, self.name)
        d = {
            "notification": {
                "id": "",
                "type": None,
                "sender": "",
                "counts": {"unread": badge},
                "devices": [
                    {
                        "app_id": self.app_id,
                        "pushkey": self.pushkey,
                        "pushkey_ts": long(self.pushkey_ts / 1000),
                        "data": self.data_minus_url,
                    }
                ],
            }
        }
        try:
            yield self.http_client.post_json_get_json(self.url, d)
            http_badges_processed_counter.inc()
        except Exception as e:
            logger.warning(
                "Failed to send badge count to %s: %s %s", self.name, type(e), e
            )
            http_badges_failed_counter.inc()