summary refs log tree commit diff
path: root/synapse/storage/databases/main/transactions.py
blob: ba79e19f7fe8301911524075af6d302bf55ceab7 (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
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
# 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.

import logging
from enum import Enum
from typing import TYPE_CHECKING, Iterable, List, Optional, Tuple, cast

import attr
from canonicaljson import encode_canonical_json

from synapse.metrics.background_process_metrics import wrap_as_background_process
from synapse.storage._base import db_to_json
from synapse.storage.database import (
    DatabasePool,
    LoggingDatabaseConnection,
    LoggingTransaction,
)
from synapse.storage.databases.main.cache import CacheInvalidationWorkerStore
from synapse.types import JsonDict
from synapse.util.caches.descriptors import cached

if TYPE_CHECKING:
    from synapse.server import HomeServer

db_binary_type = memoryview

logger = logging.getLogger(__name__)


class DestinationSortOrder(Enum):
    """Enum to define the sorting method used when returning destinations."""

    DESTINATION = "destination"
    RETRY_LAST_TS = "retry_last_ts"
    RETTRY_INTERVAL = "retry_interval"
    FAILURE_TS = "failure_ts"
    LAST_SUCCESSFUL_STREAM_ORDERING = "last_successful_stream_ordering"


@attr.s(slots=True, frozen=True, auto_attribs=True)
class DestinationRetryTimings:
    """The current destination retry timing info for a remote server."""

    # The first time we tried and failed to reach the remote server, in ms.
    failure_ts: int

    # The last time we tried and failed to reach the remote server, in ms.
    retry_last_ts: int

    # How long since the last time we tried to reach the remote server before
    # trying again, in ms.
    retry_interval: int


class TransactionWorkerStore(CacheInvalidationWorkerStore):
    def __init__(
        self,
        database: DatabasePool,
        db_conn: LoggingDatabaseConnection,
        hs: "HomeServer",
    ):
        super().__init__(database, db_conn, hs)

        if hs.config.worker.run_background_tasks:
            self._clock.looping_call(self._cleanup_transactions, 30 * 60 * 1000)

    @wrap_as_background_process("cleanup_transactions")
    async def _cleanup_transactions(self) -> None:
        now = self._clock.time_msec()
        month_ago = now - 30 * 24 * 60 * 60 * 1000

        def _cleanup_transactions_txn(txn: LoggingTransaction) -> None:
            txn.execute("DELETE FROM received_transactions WHERE ts < ?", (month_ago,))

        await self.db_pool.runInteraction(
            "_cleanup_transactions", _cleanup_transactions_txn
        )

    async def get_received_txn_response(
        self, transaction_id: str, origin: str
    ) -> Optional[Tuple[int, JsonDict]]:
        """For an incoming transaction from a given origin, check if we have
        already responded to it. If so, return the response code and response
        body (as a dict).

        Args:
            transaction_id
            origin

        Returns:
            None if we have not previously responded to this transaction or a
            2-tuple of (int, dict)
        """

        return await self.db_pool.runInteraction(
            "get_received_txn_response",
            self._get_received_txn_response,
            transaction_id,
            origin,
        )

    def _get_received_txn_response(
        self, txn: LoggingTransaction, transaction_id: str, origin: str
    ) -> Optional[Tuple[int, JsonDict]]:
        result = self.db_pool.simple_select_one_txn(
            txn,
            table="received_transactions",
            keyvalues={"transaction_id": transaction_id, "origin": origin},
            retcols=(
                "transaction_id",
                "origin",
                "ts",
                "response_code",
                "response_json",
                "has_been_referenced",
            ),
            allow_none=True,
        )

        if result and result["response_code"]:
            return result["response_code"], db_to_json(result["response_json"])

        else:
            return None

    async def set_received_txn_response(
        self, transaction_id: str, origin: str, code: int, response_dict: JsonDict
    ) -> None:
        """Persist the response we returned for an incoming transaction, and
        should return for subsequent transactions with the same transaction_id
        and origin.

        Args:
            transaction_id: The incoming transaction ID.
            origin: The origin server.
            code: The response code.
            response_dict: The response, to be encoded into JSON.
        """

        await self.db_pool.simple_upsert(
            table="received_transactions",
            keyvalues={
                "transaction_id": transaction_id,
                "origin": origin,
            },
            values={},
            insertion_values={
                "response_code": code,
                "response_json": db_binary_type(encode_canonical_json(response_dict)),
                "ts": self._clock.time_msec(),
            },
            desc="set_received_txn_response",
        )

    @cached(max_entries=10000)
    async def get_destination_retry_timings(
        self,
        destination: str,
    ) -> Optional[DestinationRetryTimings]:
        """Gets the current retry timings (if any) for a given destination.

        Args:
            destination (str)

        Returns:
            None if not retrying
            Otherwise a dict for the retry scheme
        """

        result = await self.db_pool.runInteraction(
            "get_destination_retry_timings",
            self._get_destination_retry_timings,
            destination,
        )

        return result

    def _get_destination_retry_timings(
        self, txn: LoggingTransaction, destination: str
    ) -> Optional[DestinationRetryTimings]:
        result = self.db_pool.simple_select_one_txn(
            txn,
            table="destinations",
            keyvalues={"destination": destination},
            retcols=("failure_ts", "retry_last_ts", "retry_interval"),
            allow_none=True,
        )

        # check we have a row and retry_last_ts is not null or zero
        # (retry_last_ts can't be negative)
        if result and result["retry_last_ts"]:
            return DestinationRetryTimings(**result)
        else:
            return None

    async def set_destination_retry_timings(
        self,
        destination: str,
        failure_ts: Optional[int],
        retry_last_ts: int,
        retry_interval: int,
    ) -> None:
        """Sets the current retry timings for a given destination.
        Both timings should be zero if retrying is no longer occurring.

        Args:
            destination
            failure_ts: when the server started failing (ms since epoch)
            retry_last_ts: time of last retry attempt in unix epoch ms
            retry_interval: how long until next retry in ms
        """

        if self.database_engine.can_native_upsert:
            await self.db_pool.runInteraction(
                "set_destination_retry_timings",
                self._set_destination_retry_timings_native,
                destination,
                failure_ts,
                retry_last_ts,
                retry_interval,
                db_autocommit=True,  # Safe as its a single upsert
            )
        else:
            await self.db_pool.runInteraction(
                "set_destination_retry_timings",
                self._set_destination_retry_timings_emulated,
                destination,
                failure_ts,
                retry_last_ts,
                retry_interval,
            )

    def _set_destination_retry_timings_native(
        self,
        txn: LoggingTransaction,
        destination: str,
        failure_ts: Optional[int],
        retry_last_ts: int,
        retry_interval: int,
    ) -> None:
        assert self.database_engine.can_native_upsert

        # Upsert retry time interval if retry_interval is zero (i.e. we're
        # resetting it) or greater than the existing retry interval.
        #
        # WARNING: This is executed in autocommit, so we shouldn't add any more
        # SQL calls in here (without being very careful).
        sql = """
            INSERT INTO destinations (
                destination, failure_ts, retry_last_ts, retry_interval
            )
                VALUES (?, ?, ?, ?)
            ON CONFLICT (destination) DO UPDATE SET
                    failure_ts = EXCLUDED.failure_ts,
                    retry_last_ts = EXCLUDED.retry_last_ts,
                    retry_interval = EXCLUDED.retry_interval
                WHERE
                    EXCLUDED.retry_interval = 0
                    OR destinations.retry_interval IS NULL
                    OR destinations.retry_interval < EXCLUDED.retry_interval
        """

        txn.execute(sql, (destination, failure_ts, retry_last_ts, retry_interval))

        self._invalidate_cache_and_stream(
            txn, self.get_destination_retry_timings, (destination,)
        )

    def _set_destination_retry_timings_emulated(
        self,
        txn: LoggingTransaction,
        destination: str,
        failure_ts: Optional[int],
        retry_last_ts: int,
        retry_interval: int,
    ) -> None:
        self.database_engine.lock_table(txn, "destinations")

        # We need to be careful here as the data may have changed from under us
        # due to a worker setting the timings.

        prev_row = self.db_pool.simple_select_one_txn(
            txn,
            table="destinations",
            keyvalues={"destination": destination},
            retcols=("failure_ts", "retry_last_ts", "retry_interval"),
            allow_none=True,
        )

        if not prev_row:
            self.db_pool.simple_insert_txn(
                txn,
                table="destinations",
                values={
                    "destination": destination,
                    "failure_ts": failure_ts,
                    "retry_last_ts": retry_last_ts,
                    "retry_interval": retry_interval,
                },
            )
        elif (
            retry_interval == 0
            or prev_row["retry_interval"] is None
            or prev_row["retry_interval"] < retry_interval
        ):
            self.db_pool.simple_update_one_txn(
                txn,
                "destinations",
                keyvalues={"destination": destination},
                updatevalues={
                    "failure_ts": failure_ts,
                    "retry_last_ts": retry_last_ts,
                    "retry_interval": retry_interval,
                },
            )

        self._invalidate_cache_and_stream(
            txn, self.get_destination_retry_timings, (destination,)
        )

    async def store_destination_rooms_entries(
        self,
        destinations: Iterable[str],
        room_id: str,
        stream_ordering: int,
    ) -> None:
        """
        Updates or creates `destination_rooms` entries in batch for a single event.

        Args:
            destinations: list of destinations
            room_id: the room_id of the event
            stream_ordering: the stream_ordering of the event
        """

        await self.db_pool.simple_upsert_many(
            table="destinations",
            key_names=("destination",),
            key_values=[(d,) for d in destinations],
            value_names=[],
            value_values=[],
            desc="store_destination_rooms_entries_dests",
        )

        rows = [(destination, room_id) for destination in destinations]
        await self.db_pool.simple_upsert_many(
            table="destination_rooms",
            key_names=("destination", "room_id"),
            key_values=rows,
            value_names=["stream_ordering"],
            value_values=[(stream_ordering,)] * len(rows),
            desc="store_destination_rooms_entries_rooms",
        )

    async def get_destination_last_successful_stream_ordering(
        self, destination: str
    ) -> Optional[int]:
        """
        Gets the stream ordering of the PDU most-recently successfully sent
        to the specified destination, or None if this information has not been
        tracked yet.

        Args:
            destination: the destination to query
        """
        return await self.db_pool.simple_select_one_onecol(
            "destinations",
            {"destination": destination},
            "last_successful_stream_ordering",
            allow_none=True,
            desc="get_last_successful_stream_ordering",
        )

    async def set_destination_last_successful_stream_ordering(
        self, destination: str, last_successful_stream_ordering: int
    ) -> None:
        """
        Marks that we have successfully sent the PDUs up to and including the
        one specified.

        Args:
            destination: the destination we have successfully sent to
            last_successful_stream_ordering: the stream_ordering of the most
                recent successfully-sent PDU
        """
        await self.db_pool.simple_upsert(
            "destinations",
            keyvalues={"destination": destination},
            values={"last_successful_stream_ordering": last_successful_stream_ordering},
            desc="set_last_successful_stream_ordering",
        )

    async def get_catch_up_room_event_ids(
        self,
        destination: str,
        last_successful_stream_ordering: int,
    ) -> List[str]:
        """
        Returns at most 50 event IDs and their corresponding stream_orderings
        that correspond to the oldest events that have not yet been sent to
        the destination.

        Args:
            destination: the destination in question
            last_successful_stream_ordering: the stream_ordering of the
                most-recently successfully-transmitted event to the destination

        Returns:
            list of event_ids
        """
        return await self.db_pool.runInteraction(
            "get_catch_up_room_event_ids",
            self._get_catch_up_room_event_ids_txn,
            destination,
            last_successful_stream_ordering,
        )

    @staticmethod
    def _get_catch_up_room_event_ids_txn(
        txn: LoggingTransaction,
        destination: str,
        last_successful_stream_ordering: int,
    ) -> List[str]:
        q = """
                SELECT event_id FROM destination_rooms
                 JOIN events USING (stream_ordering)
                WHERE destination = ?
                  AND stream_ordering > ?
                ORDER BY stream_ordering
                LIMIT 50
            """
        txn.execute(
            q,
            (destination, last_successful_stream_ordering),
        )
        event_ids = [row[0] for row in txn]
        return event_ids

    async def get_catch_up_outstanding_destinations(
        self, after_destination: Optional[str]
    ) -> List[str]:
        """
        Gets at most 25 destinations which have outstanding PDUs to be caught up,
        and are not being backed off from
        Args:
            after_destination:
                If provided, all destinations must be lexicographically greater
                than this one.

        Returns:
            list of up to 25 destinations with outstanding catch-up.
                These are the lexicographically first destinations which are
                lexicographically greater than after_destination (if provided).
        """
        time = self.hs.get_clock().time_msec()

        return await self.db_pool.runInteraction(
            "get_catch_up_outstanding_destinations",
            self._get_catch_up_outstanding_destinations_txn,
            time,
            after_destination,
        )

    @staticmethod
    def _get_catch_up_outstanding_destinations_txn(
        txn: LoggingTransaction, now_time_ms: int, after_destination: Optional[str]
    ) -> List[str]:
        q = """
            SELECT DISTINCT destination FROM destinations
            INNER JOIN destination_rooms USING (destination)
                WHERE
                    stream_ordering > last_successful_stream_ordering
                    AND destination > ?
                    AND (
                        retry_last_ts IS NULL OR
                        retry_last_ts + retry_interval < ?
                    )
                    ORDER BY destination
                    LIMIT 25
        """
        txn.execute(
            q,
            (
                # everything is lexicographically greater than "" so this gives
                # us the first batch of up to 25.
                after_destination or "",
                now_time_ms,
            ),
        )

        destinations = [row[0] for row in txn]
        return destinations

    async def get_destinations_paginate(
        self,
        start: int,
        limit: int,
        destination: Optional[str] = None,
        order_by: str = DestinationSortOrder.DESTINATION.value,
        direction: str = "f",
    ) -> Tuple[List[JsonDict], int]:
        """Function to retrieve a paginated list of destinations.
        This will return a json list of destinations and the
        total number of destinations matching the filter criteria.

        Args:
            start: start number to begin the query from
            limit: number of rows to retrieve
            destination: search string in destination
            order_by: the sort order of the returned list
            direction: sort ascending or descending
        Returns:
            A tuple of a list of mappings from destination to information
            and a count of total destinations.
        """

        def get_destinations_paginate_txn(
            txn: LoggingTransaction,
        ) -> Tuple[List[JsonDict], int]:
            order_by_column = DestinationSortOrder(order_by).value

            if direction == "b":
                order = "DESC"
            else:
                order = "ASC"

            args: List[object] = []
            where_statement = ""
            if destination:
                args.extend(["%" + destination.lower() + "%"])
                where_statement = "WHERE LOWER(destination) LIKE ?"

            sql_base = f"FROM destinations {where_statement} "
            sql = f"SELECT COUNT(*) as total_destinations {sql_base}"
            txn.execute(sql, args)
            count = cast(Tuple[int], txn.fetchone())[0]

            sql = f"""
                SELECT destination, retry_last_ts, retry_interval, failure_ts,
                last_successful_stream_ordering
                {sql_base}
                ORDER BY {order_by_column} {order}, destination ASC
                LIMIT ? OFFSET ?
            """
            txn.execute(sql, args + [limit, start])
            destinations = self.db_pool.cursor_to_dict(txn)
            return destinations, count

        return await self.db_pool.runInteraction(
            "get_destinations_paginate_txn", get_destinations_paginate_txn
        )

    async def get_destination_rooms_paginate(
        self, destination: str, start: int, limit: int, direction: str = "f"
    ) -> Tuple[List[JsonDict], int]:
        """Function to retrieve a paginated list of destination's rooms.
        This will return a json list of rooms and the
        total number of rooms.

        Args:
            destination: the destination to query
            start: start number to begin the query from
            limit: number of rows to retrieve
            direction: sort ascending or descending by room_id
        Returns:
            A tuple of a dict of rooms and a count of total rooms.
        """

        def get_destination_rooms_paginate_txn(
            txn: LoggingTransaction,
        ) -> Tuple[List[JsonDict], int]:

            if direction == "b":
                order = "DESC"
            else:
                order = "ASC"

            sql = """
                SELECT COUNT(*) as total_rooms
                FROM destination_rooms
                WHERE destination = ?
                """
            txn.execute(sql, [destination])
            count = cast(Tuple[int], txn.fetchone())[0]

            rooms = self.db_pool.simple_select_list_paginate_txn(
                txn=txn,
                table="destination_rooms",
                orderby="room_id",
                start=start,
                limit=limit,
                retcols=("room_id", "stream_ordering"),
                order_direction=order,
            )
            return rooms, count

        return await self.db_pool.runInteraction(
            "get_destination_rooms_paginate_txn", get_destination_rooms_paginate_txn
        )

    async def is_destination_known(self, destination: str) -> bool:
        """Check if a destination is known to the server."""
        result = await self.db_pool.simple_select_one_onecol(
            table="destinations",
            keyvalues={"destination": destination},
            retcol="1",
            allow_none=True,
            desc="is_destination_known",
        )
        return bool(result)