summary refs log tree commit diff
path: root/synapse/replication/tcp/streams/_base.py
blob: 1e92d52165e57f5fde41e9a891ecf6a6e9362fdd (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
# -*- coding: utf-8 -*-
# Copyright 2017 Vector Creations Ltd
# Copyright 2019 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 heapq
import logging
from collections import namedtuple
from typing import (
    TYPE_CHECKING,
    Any,
    Awaitable,
    Callable,
    List,
    Optional,
    Tuple,
    TypeVar,
)

import attr

from synapse.replication.http.streams import ReplicationGetStreamUpdates

if TYPE_CHECKING:
    import synapse.server

logger = logging.getLogger(__name__)

# the number of rows to request from an update_function.
_STREAM_UPDATE_TARGET_ROW_COUNT = 100


# Some type aliases to make things a bit easier.

# A stream position token
Token = int

# The type of a stream update row, after JSON deserialisation, but before
# parsing with Stream.parse_row (which turns it into a `ROW_TYPE`). Normally it's
# just a row from a database query, though this is dependent on the stream in question.
#
StreamRow = TypeVar("StreamRow", bound=Tuple)

# The type returned by the update_function of a stream, as well as get_updates(),
# get_updates_since, etc.
#
# It consists of a triplet `(updates, new_last_token, limited)`, where:
#   * `updates` is a list of `(token, row)` entries.
#   * `new_last_token` is the new position in stream.
#   * `limited` is whether there are more updates to fetch.
#
StreamUpdateResult = Tuple[List[Tuple[Token, StreamRow]], Token, bool]

# The type of an update_function for a stream
#
# The arguments are:
#
#  * instance_name: the writer of the stream
#  * from_token: the previous stream token: the starting point for fetching the
#    updates
#  * to_token: the new stream token: the point to get updates up to
#  * target_row_count: a target for the number of rows to be returned.
#
# The update_function is expected to return up to _approximately_ target_row_count rows.
# If there are more updates available, it should set `limited` in the result, and
# it will be called again to get the next batch.
#
UpdateFunction = Callable[[str, Token, Token, int], Awaitable[StreamUpdateResult]]


class Stream(object):
    """Base class for the streams.

    Provides a `get_updates()` function that returns new updates since the last
    time it was called.
    """

    NAME = None  # type: str  # The name of the stream
    # The type of the row. Used by the default impl of parse_row.
    ROW_TYPE = None  # type: Any

    @classmethod
    def parse_row(cls, row: StreamRow):
        """Parse a row received over replication

        By default, assumes that the row data is an array object and passes its contents
        to the constructor of the ROW_TYPE for this stream.

        Args:
            row: row data from the incoming RDATA command, after json decoding

        Returns:
            ROW_TYPE object for this stream
        """
        return cls.ROW_TYPE(*row)

    def __init__(
        self,
        local_instance_name: str,
        current_token_function: Callable[[str], Token],
        update_function: UpdateFunction,
    ):
        """Instantiate a Stream

        `current_token_function` and `update_function` are callbacks which
        should be implemented by subclasses.

        `current_token_function` takes an instance name, which is a writer to
        the stream, and returns the position in the stream of the writer (as
        viewed from the current process). On the writer process this is where
        the writer has successfully written up to, whereas on other processes
        this is the position which we have received updates up to over
        replication. (Note that most streams have a single writer and so their
        implementations ignore the instance name passed in).

        `update_function` is called to get updates for this stream between a
        pair of stream tokens. See the `UpdateFunction` type definition for more
        info.

        Args:
            local_instance_name: The instance name of the current process
            current_token_function: callback to get the current token, as above
            update_function: callback go get stream updates, as above
        """
        self.local_instance_name = local_instance_name
        self.current_token = current_token_function
        self.update_function = update_function

        # The token from which we last asked for updates
        self.last_token = self.current_token(self.local_instance_name)

    def discard_updates_and_advance(self):
        """Called when the stream should advance but the updates would be discarded,
        e.g. when there are no currently connected workers.
        """
        self.last_token = self.current_token(self.local_instance_name)

    async def get_updates(self) -> StreamUpdateResult:
        """Gets all updates since the last time this function was called (or
        since the stream was constructed if it hadn't been called before).

        Returns:
            A triplet `(updates, new_last_token, limited)`, where `updates` is
            a list of `(token, row)` entries, `new_last_token` is the new
            position in stream, and `limited` is whether there are more updates
            to fetch.
        """
        current_token = self.current_token(self.local_instance_name)
        updates, current_token, limited = await self.get_updates_since(
            self.local_instance_name, self.last_token, current_token
        )
        self.last_token = current_token

        return updates, current_token, limited

    async def get_updates_since(
        self, instance_name: str, from_token: Token, upto_token: Token
    ) -> StreamUpdateResult:
        """Like get_updates except allows specifying from when we should
        stream updates

        Returns:
            A triplet `(updates, new_last_token, limited)`, where `updates` is
            a list of `(token, row)` entries, `new_last_token` is the new
            position in stream, and `limited` is whether there are more updates
            to fetch.
        """

        from_token = int(from_token)

        if from_token == upto_token:
            return [], upto_token, False

        updates, upto_token, limited = await self.update_function(
            instance_name, from_token, upto_token, _STREAM_UPDATE_TARGET_ROW_COUNT,
        )
        return updates, upto_token, limited


def current_token_without_instance(
    current_token: Callable[[], int]
) -> Callable[[str], int]:
    """Takes a current token callback function for a single writer stream
    that doesn't take an instance name parameter and wraps it in a function that
    does accept an instance name parameter but ignores it.
    """
    return lambda instance_name: current_token()


def make_http_update_function(hs, stream_name: str) -> UpdateFunction:
    """Makes a suitable function for use as an `update_function` that queries
    the master process for updates.
    """

    client = ReplicationGetStreamUpdates.make_client(hs)

    async def update_function(
        instance_name: str, from_token: int, upto_token: int, limit: int
    ) -> StreamUpdateResult:
        result = await client(
            instance_name=instance_name,
            stream_name=stream_name,
            from_token=from_token,
            upto_token=upto_token,
        )
        return result["updates"], result["upto_token"], result["limited"]

    return update_function


class BackfillStream(Stream):
    """We fetched some old events and either we had never seen that event before
    or it went from being an outlier to not.
    """

    BackfillStreamRow = namedtuple(
        "BackfillStreamRow",
        (
            "event_id",  # str
            "room_id",  # str
            "type",  # str
            "state_key",  # str, optional
            "redacts",  # str, optional
            "relates_to",  # str, optional
        ),
    )

    NAME = "backfill"
    ROW_TYPE = BackfillStreamRow

    def __init__(self, hs):
        store = hs.get_datastore()
        super().__init__(
            hs.get_instance_name(),
            current_token_without_instance(store.get_current_backfill_token),
            store.get_all_new_backfill_event_rows,
        )


class PresenceStream(Stream):
    PresenceStreamRow = namedtuple(
        "PresenceStreamRow",
        (
            "user_id",  # str
            "state",  # str
            "last_active_ts",  # int
            "last_federation_update_ts",  # int
            "last_user_sync_ts",  # int
            "status_msg",  # str
            "currently_active",  # bool
        ),
    )

    NAME = "presence"
    ROW_TYPE = PresenceStreamRow

    def __init__(self, hs):
        store = hs.get_datastore()

        if hs.config.worker_app is None:
            # on the master, query the presence handler
            presence_handler = hs.get_presence_handler()
            update_function = presence_handler.get_all_presence_updates
        else:
            # Query master process
            update_function = make_http_update_function(hs, self.NAME)

        super().__init__(
            hs.get_instance_name(),
            current_token_without_instance(store.get_current_presence_token),
            update_function,
        )


class TypingStream(Stream):
    TypingStreamRow = namedtuple(
        "TypingStreamRow", ("room_id", "user_ids")  # str  # list(str)
    )

    NAME = "typing"
    ROW_TYPE = TypingStreamRow

    def __init__(self, hs):
        typing_handler = hs.get_typing_handler()

        writer_instance = hs.config.worker.writers.typing
        if writer_instance == hs.get_instance_name():
            # On the writer, query the typing handler
            update_function = typing_handler.get_all_typing_updates
        else:
            # Query the typing writer process
            update_function = make_http_update_function(hs, self.NAME)

        super().__init__(
            hs.get_instance_name(),
            current_token_without_instance(typing_handler.get_current_token),
            update_function,
        )


class ReceiptsStream(Stream):
    ReceiptsStreamRow = namedtuple(
        "ReceiptsStreamRow",
        (
            "room_id",  # str
            "receipt_type",  # str
            "user_id",  # str
            "event_id",  # str
            "data",  # dict
        ),
    )

    NAME = "receipts"
    ROW_TYPE = ReceiptsStreamRow

    def __init__(self, hs):
        store = hs.get_datastore()
        super().__init__(
            hs.get_instance_name(),
            current_token_without_instance(store.get_max_receipt_stream_id),
            store.get_all_updated_receipts,
        )


class PushRulesStream(Stream):
    """A user has changed their push rules
    """

    PushRulesStreamRow = namedtuple("PushRulesStreamRow", ("user_id",))  # str

    NAME = "push_rules"
    ROW_TYPE = PushRulesStreamRow

    def __init__(self, hs):
        self.store = hs.get_datastore()

        super(PushRulesStream, self).__init__(
            hs.get_instance_name(),
            self._current_token,
            self.store.get_all_push_rule_updates,
        )

    def _current_token(self, instance_name: str) -> int:
        push_rules_token, _ = self.store.get_push_rules_stream_token()
        return push_rules_token


class PushersStream(Stream):
    """A user has added/changed/removed a pusher
    """

    PushersStreamRow = namedtuple(
        "PushersStreamRow",
        ("user_id", "app_id", "pushkey", "deleted"),  # str  # str  # str  # bool
    )

    NAME = "pushers"
    ROW_TYPE = PushersStreamRow

    def __init__(self, hs):
        store = hs.get_datastore()

        super().__init__(
            hs.get_instance_name(),
            current_token_without_instance(store.get_pushers_stream_token),
            store.get_all_updated_pushers_rows,
        )


class CachesStream(Stream):
    """A cache was invalidated on the master and no other stream would invalidate
    the cache on the workers
    """

    @attr.s
    class CachesStreamRow:
        """Stream to inform workers they should invalidate their cache.

        Attributes:
            cache_func: Name of the cached function.
            keys: The entry in the cache to invalidate. If None then will
                invalidate all.
            invalidation_ts: Timestamp of when the invalidation took place.
        """

        cache_func = attr.ib(type=str)
        keys = attr.ib(type=Optional[List[Any]])
        invalidation_ts = attr.ib(type=int)

    NAME = "caches"
    ROW_TYPE = CachesStreamRow

    def __init__(self, hs):
        store = hs.get_datastore()
        super().__init__(
            hs.get_instance_name(),
            store.get_cache_stream_token_for_writer,
            store.get_all_updated_caches,
        )


class PublicRoomsStream(Stream):
    """The public rooms list changed
    """

    PublicRoomsStreamRow = namedtuple(
        "PublicRoomsStreamRow",
        (
            "room_id",  # str
            "visibility",  # str
            "appservice_id",  # str, optional
            "network_id",  # str, optional
        ),
    )

    NAME = "public_rooms"
    ROW_TYPE = PublicRoomsStreamRow

    def __init__(self, hs):
        store = hs.get_datastore()
        super().__init__(
            hs.get_instance_name(),
            current_token_without_instance(store.get_current_public_room_stream_id),
            store.get_all_new_public_rooms,
        )


class DeviceListsStream(Stream):
    """Either a user has updated their devices or a remote server needs to be
    told about a device update.
    """

    @attr.s
    class DeviceListsStreamRow:
        entity = attr.ib(type=str)

    NAME = "device_lists"
    ROW_TYPE = DeviceListsStreamRow

    def __init__(self, hs):
        store = hs.get_datastore()
        super().__init__(
            hs.get_instance_name(),
            current_token_without_instance(store.get_device_stream_token),
            store.get_all_device_list_changes_for_remotes,
        )


class ToDeviceStream(Stream):
    """New to_device messages for a client
    """

    ToDeviceStreamRow = namedtuple("ToDeviceStreamRow", ("entity",))  # str

    NAME = "to_device"
    ROW_TYPE = ToDeviceStreamRow

    def __init__(self, hs):
        store = hs.get_datastore()
        super().__init__(
            hs.get_instance_name(),
            current_token_without_instance(store.get_to_device_stream_token),
            store.get_all_new_device_messages,
        )


class TagAccountDataStream(Stream):
    """Someone added/removed a tag for a room
    """

    TagAccountDataStreamRow = namedtuple(
        "TagAccountDataStreamRow", ("user_id", "room_id", "data")  # str  # str  # dict
    )

    NAME = "tag_account_data"
    ROW_TYPE = TagAccountDataStreamRow

    def __init__(self, hs):
        store = hs.get_datastore()
        super().__init__(
            hs.get_instance_name(),
            current_token_without_instance(store.get_max_account_data_stream_id),
            store.get_all_updated_tags,
        )


class AccountDataStream(Stream):
    """Global or per room account data was changed
    """

    AccountDataStreamRow = namedtuple(
        "AccountDataStream",
        ("user_id", "room_id", "data_type"),  # str  # Optional[str]  # str
    )

    NAME = "account_data"
    ROW_TYPE = AccountDataStreamRow

    def __init__(self, hs: "synapse.server.HomeServer"):
        self.store = hs.get_datastore()
        super().__init__(
            hs.get_instance_name(),
            current_token_without_instance(self.store.get_max_account_data_stream_id),
            self._update_function,
        )

    async def _update_function(
        self, instance_name: str, from_token: int, to_token: int, limit: int
    ) -> StreamUpdateResult:
        limited = False
        global_results = await self.store.get_updated_global_account_data(
            from_token, to_token, limit
        )

        # if the global results hit the limit, we'll need to limit the room results to
        # the same stream token.
        if len(global_results) >= limit:
            to_token = global_results[-1][0]
            limited = True

        room_results = await self.store.get_updated_room_account_data(
            from_token, to_token, limit
        )

        # likewise, if the room results hit the limit, limit the global results to
        # the same stream token.
        if len(room_results) >= limit:
            to_token = room_results[-1][0]
            limited = True

        # convert the global results to the right format, and limit them to the to_token
        # at the same time
        global_rows = (
            (stream_id, (user_id, None, account_data_type))
            for stream_id, user_id, account_data_type in global_results
            if stream_id <= to_token
        )

        # we know that the room_results are already limited to `to_token` so no need
        # for a check on `stream_id` here.
        room_rows = (
            (stream_id, (user_id, room_id, account_data_type))
            for stream_id, user_id, room_id, account_data_type in room_results
        )

        # We need to return a sorted list, so merge them together.
        #
        # Note: We order only by the stream ID to work around a bug where the
        # same stream ID could appear in both `global_rows` and `room_rows`,
        # leading to a comparison between the data tuples. The comparison could
        # fail due to attempting to compare the `room_id` which results in a
        # `TypeError` from comparing a `str` vs `None`.
        updates = list(heapq.merge(room_rows, global_rows, key=lambda row: row[0]))
        return updates, to_token, limited


class GroupServerStream(Stream):
    GroupsStreamRow = namedtuple(
        "GroupsStreamRow",
        ("group_id", "user_id", "type", "content"),  # str  # str  # str  # dict
    )

    NAME = "groups"
    ROW_TYPE = GroupsStreamRow

    def __init__(self, hs):
        store = hs.get_datastore()
        super().__init__(
            hs.get_instance_name(),
            current_token_without_instance(store.get_group_stream_token),
            store.get_all_groups_changes,
        )


class UserSignatureStream(Stream):
    """A user has signed their own device with their user-signing key
    """

    UserSignatureStreamRow = namedtuple("UserSignatureStreamRow", ("user_id"))  # str

    NAME = "user_signature"
    ROW_TYPE = UserSignatureStreamRow

    def __init__(self, hs):
        store = hs.get_datastore()
        super().__init__(
            hs.get_instance_name(),
            current_token_without_instance(store.get_device_stream_token),
            store.get_all_user_signature_changes_for_remotes,
        )