summary refs log tree commit diff
path: root/synapse/storage/databases/main/appservice.py
blob: abea4383c74299286da789dd4236e8f7887f6f92 (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
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
# Copyright 2015, 2016 OpenMarket Ltd
# Copyright 2018 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 re
from typing import TYPE_CHECKING, List, Optional, Pattern, Tuple

from synapse.appservice import (
    ApplicationService,
    ApplicationServiceState,
    AppServiceTransaction,
    TransactionOneTimeKeyCounts,
    TransactionUnusedFallbackKeys,
)
from synapse.config.appservice import load_appservices
from synapse.events import EventBase
from synapse.storage._base import db_to_json
from synapse.storage.database import DatabasePool, LoggingDatabaseConnection
from synapse.storage.databases.main.events_worker import EventsWorkerStore
from synapse.storage.databases.main.roommember import RoomMemberWorkerStore
from synapse.types import JsonDict
from synapse.util import json_encoder
from synapse.util.caches.descriptors import _CacheContext, cached

if TYPE_CHECKING:
    from synapse.server import HomeServer

logger = logging.getLogger(__name__)


def _make_exclusive_regex(
    services_cache: List[ApplicationService],
) -> Optional[Pattern]:
    # We precompile a regex constructed from all the regexes that the AS's
    # have registered for exclusive users.
    exclusive_user_regexes = [
        regex.pattern
        for service in services_cache
        for regex in service.get_exclusive_user_regexes()
    ]
    if exclusive_user_regexes:
        exclusive_user_regex = "|".join("(" + r + ")" for r in exclusive_user_regexes)
        exclusive_user_pattern: Optional[Pattern] = re.compile(exclusive_user_regex)
    else:
        # We handle this case specially otherwise the constructed regex
        # will always match
        exclusive_user_pattern = None

    return exclusive_user_pattern


class ApplicationServiceWorkerStore(RoomMemberWorkerStore):
    def __init__(
        self,
        database: DatabasePool,
        db_conn: LoggingDatabaseConnection,
        hs: "HomeServer",
    ):
        self.services_cache = load_appservices(
            hs.hostname, hs.config.appservice.app_service_config_files
        )
        self.exclusive_user_regex = _make_exclusive_regex(self.services_cache)

        super().__init__(database, db_conn, hs)

    def get_app_services(self):
        return self.services_cache

    def get_if_app_services_interested_in_user(self, user_id: str) -> bool:
        """Check if the user is one associated with an app service (exclusively)"""
        if self.exclusive_user_regex:
            return bool(self.exclusive_user_regex.match(user_id))
        else:
            return False

    def get_app_service_by_user_id(self, user_id: str) -> Optional[ApplicationService]:
        """Retrieve an application service from their user ID.

        All application services have associated with them a particular user ID.
        There is no distinguishing feature on the user ID which indicates it
        represents an application service. This function allows you to map from
        a user ID to an application service.

        Args:
            user_id: The user ID to see if it is an application service.
        Returns:
            The application service or None.
        """
        for service in self.services_cache:
            if service.sender == user_id:
                return service
        return None

    def get_app_service_by_token(self, token: str) -> Optional[ApplicationService]:
        """Get the application service with the given appservice token.

        Args:
            token: The application service token.
        Returns:
            The application service or None.
        """
        for service in self.services_cache:
            if service.token == token:
                return service
        return None

    def get_app_service_by_id(self, as_id: str) -> Optional[ApplicationService]:
        """Get the application service with the given appservice ID.

        Args:
            as_id: The application service ID.
        Returns:
            The application service or None.
        """
        for service in self.services_cache:
            if service.id == as_id:
                return service
        return None

    @cached(iterable=True, cache_context=True)
    async def get_app_service_users_in_room(
        self,
        room_id: str,
        app_service: "ApplicationService",
        cache_context: _CacheContext,
    ) -> List[str]:
        users_in_room = await self.get_users_in_room(
            room_id, on_invalidate=cache_context.invalidate
        )
        return list(filter(app_service.is_interested_in_user, users_in_room))


class ApplicationServiceStore(ApplicationServiceWorkerStore):
    # This is currently empty due to there not being any AS storage functions
    # that can't be run on the workers. Since this may change in future, and
    # to keep consistency with the other stores, we keep this empty class for
    # now.
    pass


class ApplicationServiceTransactionWorkerStore(
    ApplicationServiceWorkerStore, EventsWorkerStore
):
    async def get_appservices_by_state(
        self, state: ApplicationServiceState
    ) -> List[ApplicationService]:
        """Get a list of application services based on their state.

        Args:
            state: The state to filter on.
        Returns:
            A list of ApplicationServices, which may be empty.
        """
        results = await self.db_pool.simple_select_list(
            "application_services_state", {"state": state.value}, ["as_id"]
        )
        # NB: This assumes this class is linked with ApplicationServiceStore
        as_list = self.get_app_services()
        services = []

        for res in results:
            for service in as_list:
                if service.id == res["as_id"]:
                    services.append(service)
        return services

    async def get_appservice_state(
        self, service: ApplicationService
    ) -> Optional[ApplicationServiceState]:
        """Get the application service state.

        Args:
            service: The service whose state to set.
        Returns:
            An ApplicationServiceState or none.
        """
        result = await self.db_pool.simple_select_one(
            "application_services_state",
            {"as_id": service.id},
            ["state"],
            allow_none=True,
            desc="get_appservice_state",
        )
        if result:
            return ApplicationServiceState(result.get("state"))
        return None

    async def set_appservice_state(
        self, service: ApplicationService, state: ApplicationServiceState
    ) -> None:
        """Set the application service state.

        Args:
            service: The service whose state to set.
            state: The connectivity state to apply.
        """
        await self.db_pool.simple_upsert(
            "application_services_state", {"as_id": service.id}, {"state": state.value}
        )

    async def create_appservice_txn(
        self,
        service: ApplicationService,
        events: List[EventBase],
        ephemeral: List[JsonDict],
        to_device_messages: List[JsonDict],
        one_time_key_counts: TransactionOneTimeKeyCounts,
        unused_fallback_keys: TransactionUnusedFallbackKeys,
    ) -> AppServiceTransaction:
        """Atomically creates a new transaction for this application service
        with the given list of events. Ephemeral events are NOT persisted to the
        database and are not resent if a transaction is retried.

        Args:
            service: The service who the transaction is for.
            events: A list of persistent events to put in the transaction.
            ephemeral: A list of ephemeral events to put in the transaction.
            to_device_messages: A list of to-device messages to put in the transaction.
            one_time_key_counts: Counts of remaining one-time keys for relevant
                appservice devices in the transaction.
            unused_fallback_keys: Lists of unused fallback keys for relevant
                appservice devices in the transaction.

        Returns:
            A new transaction.
        """

        def _create_appservice_txn(txn):
            # work out new txn id (highest txn id for this service += 1)
            # The highest id may be the last one sent (in which case it is last_txn)
            # or it may be the highest in the txns list (which are waiting to be/are
            # being sent)
            last_txn_id = self._get_last_txn(txn, service.id)

            txn.execute(
                "SELECT MAX(txn_id) FROM application_services_txns WHERE as_id=?",
                (service.id,),
            )
            highest_txn_id = txn.fetchone()[0]
            if highest_txn_id is None:
                highest_txn_id = 0

            new_txn_id = max(highest_txn_id, last_txn_id) + 1

            # Insert new txn into txn table
            event_ids = json_encoder.encode([e.event_id for e in events])
            txn.execute(
                "INSERT INTO application_services_txns(as_id, txn_id, event_ids) "
                "VALUES(?,?,?)",
                (service.id, new_txn_id, event_ids),
            )
            return AppServiceTransaction(
                service=service,
                id=new_txn_id,
                events=events,
                ephemeral=ephemeral,
                to_device_messages=to_device_messages,
                one_time_key_counts=one_time_key_counts,
                unused_fallback_keys=unused_fallback_keys,
            )

        return await self.db_pool.runInteraction(
            "create_appservice_txn", _create_appservice_txn
        )

    async def complete_appservice_txn(
        self, txn_id: int, service: ApplicationService
    ) -> None:
        """Completes an application service transaction.

        Args:
            txn_id: The transaction ID being completed.
            service: The application service which was sent this transaction.
        """
        txn_id = int(txn_id)

        def _complete_appservice_txn(txn):
            # Debugging query: Make sure the txn being completed is EXACTLY +1 from
            # what was there before. If it isn't, we've got problems (e.g. the AS
            # has probably missed some events), so whine loudly but still continue,
            # since it shouldn't fail completion of the transaction.
            last_txn_id = self._get_last_txn(txn, service.id)
            if (last_txn_id + 1) != txn_id:
                logger.error(
                    "appservice: Completing a transaction which has an ID > 1 from "
                    "the last ID sent to this AS. We've either dropped events or "
                    "sent it to the AS out of order. FIX ME. last_txn=%s "
                    "completing_txn=%s service_id=%s",
                    last_txn_id,
                    txn_id,
                    service.id,
                )

            # Set current txn_id for AS to 'txn_id'
            self.db_pool.simple_upsert_txn(
                txn,
                "application_services_state",
                {"as_id": service.id},
                {"last_txn": txn_id},
            )

            # Delete txn
            self.db_pool.simple_delete_txn(
                txn,
                "application_services_txns",
                {"txn_id": txn_id, "as_id": service.id},
            )

        await self.db_pool.runInteraction(
            "complete_appservice_txn", _complete_appservice_txn
        )

    async def get_oldest_unsent_txn(
        self, service: ApplicationService
    ) -> Optional[AppServiceTransaction]:
        """Get the oldest transaction which has not been sent for this service.

        Args:
            service: The app service to get the oldest txn.
        Returns:
            An AppServiceTransaction or None.
        """

        def _get_oldest_unsent_txn(txn):
            # Monotonically increasing txn ids, so just select the smallest
            # one in the txns table (we delete them when they are sent)
            txn.execute(
                "SELECT * FROM application_services_txns WHERE as_id=?"
                " ORDER BY txn_id ASC LIMIT 1",
                (service.id,),
            )
            rows = self.db_pool.cursor_to_dict(txn)
            if not rows:
                return None

            entry = rows[0]

            return entry

        entry = await self.db_pool.runInteraction(
            "get_oldest_unsent_appservice_txn", _get_oldest_unsent_txn
        )

        if not entry:
            return None

        event_ids = db_to_json(entry["event_ids"])

        events = await self.get_events_as_list(event_ids)

        # TODO: to-device messages, one-time key counts and unused fallback keys
        #       are not yet populated for catch-up transactions.
        #       We likely want to populate those for reliability.
        return AppServiceTransaction(
            service=service,
            id=entry["txn_id"],
            events=events,
            ephemeral=[],
            to_device_messages=[],
            one_time_key_counts={},
            unused_fallback_keys={},
        )

    def _get_last_txn(self, txn, service_id: Optional[str]) -> int:
        txn.execute(
            "SELECT last_txn FROM application_services_state WHERE as_id=?",
            (service_id,),
        )
        last_txn_id = txn.fetchone()
        if last_txn_id is None or last_txn_id[0] is None:  # no row exists
            return 0
        else:
            return int(last_txn_id[0])  # select 'last_txn' col

    async def set_appservice_last_pos(self, pos: int) -> None:
        def set_appservice_last_pos_txn(txn):
            txn.execute(
                "UPDATE appservice_stream_position SET stream_ordering = ?", (pos,)
            )

        await self.db_pool.runInteraction(
            "set_appservice_last_pos", set_appservice_last_pos_txn
        )

    async def get_new_events_for_appservice(
        self, current_id: int, limit: int
    ) -> Tuple[int, List[EventBase]]:
        """Get all new events for an appservice"""

        def get_new_events_for_appservice_txn(txn):
            sql = (
                "SELECT e.stream_ordering, e.event_id"
                " FROM events AS e"
                " WHERE"
                " (SELECT stream_ordering FROM appservice_stream_position)"
                "     < e.stream_ordering"
                " AND e.stream_ordering <= ?"
                " ORDER BY e.stream_ordering ASC"
                " LIMIT ?"
            )

            txn.execute(sql, (current_id, limit))
            rows = txn.fetchall()

            upper_bound = current_id
            if len(rows) == limit:
                upper_bound = rows[-1][0]

            return upper_bound, [row[1] for row in rows]

        upper_bound, event_ids = await self.db_pool.runInteraction(
            "get_new_events_for_appservice", get_new_events_for_appservice_txn
        )

        events = await self.get_events_as_list(event_ids, get_prev_content=True)

        return upper_bound, events

    async def get_type_stream_id_for_appservice(
        self, service: ApplicationService, type: str
    ) -> int:
        if type not in ("read_receipt", "presence", "to_device"):
            raise ValueError(
                "Expected type to be a valid application stream id type, got %s"
                % (type,)
            )

        def get_type_stream_id_for_appservice_txn(txn):
            stream_id_type = "%s_stream_id" % type
            txn.execute(
                # We do NOT want to escape `stream_id_type`.
                "SELECT %s FROM application_services_state WHERE as_id=?"
                % stream_id_type,
                (service.id,),
            )
            last_stream_id = txn.fetchone()
            if last_stream_id is None or last_stream_id[0] is None:  # no row exists
                # Stream tokens always start from 1, to avoid foot guns around `0` being falsey.
                return 1
            else:
                return int(last_stream_id[0])

        return await self.db_pool.runInteraction(
            "get_type_stream_id_for_appservice", get_type_stream_id_for_appservice_txn
        )

    async def set_appservice_stream_type_pos(
        self, service: ApplicationService, stream_type: str, pos: Optional[int]
    ) -> None:
        if stream_type not in ("read_receipt", "presence", "to_device"):
            raise ValueError(
                "Expected type to be a valid application stream id type, got %s"
                % (stream_type,)
            )

        def set_appservice_stream_type_pos_txn(txn):
            stream_id_type = "%s_stream_id" % stream_type
            txn.execute(
                "UPDATE application_services_state SET %s = ? WHERE as_id=?"
                % stream_id_type,
                (pos, service.id),
            )

        await self.db_pool.runInteraction(
            "set_appservice_stream_type_pos", set_appservice_stream_type_pos_txn
        )


class ApplicationServiceTransactionStore(ApplicationServiceTransactionWorkerStore):
    # This is currently empty due to there not being any AS storage functions
    # that can't be run on the workers. Since this may change in future, and
    # to keep consistency with the other stores, we keep this empty class for
    # now.
    pass