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Factor out `MultiWriter` token from `RoomStreamToken` (#16427)

This commit is contained in:
Erik Johnston 2023-10-05 12:46:28 +03:00 committed by GitHub
parent ab9c1e8f39
commit 009b47badf
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9 changed files with 115 additions and 61 deletions
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1
changelog.d/16427.misc Normal file
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@ -0,0 +1 @@
Factor out `MultiWriter` token from `RoomStreamToken`.

4
synapse/handlers/admin.py
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@ -171,8 +171,8 @@ class AdminHandler:
else:
stream_ordering = room.stream_ordering
from_key = RoomStreamToken(0, 0)
to_key = RoomStreamToken(None, stream_ordering)
from_key = RoomStreamToken(topological=0, stream=0)
to_key = RoomStreamToken(stream=stream_ordering)
# Events that we've processed in this room
written_events: Set[str] = set()

3
synapse/handlers/initial_sync.py
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@ -192,8 +192,7 @@ class InitialSyncHandler:
)
elif event.membership == Membership.LEAVE:
room_end_token = RoomStreamToken(
None,
event.stream_ordering,
stream=event.stream_ordering,
)
deferred_room_state = run_in_background(
self._state_storage_controller.get_state_for_events,

2
synapse/handlers/room.py
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@ -1708,7 +1708,7 @@ class RoomEventSource(EventSource[RoomStreamToken, EventBase]):
if from_key.topological:
logger.warning("Stream has topological part!!!! %r", from_key)
from_key = RoomStreamToken(None, from_key.stream)
from_key = RoomStreamToken(stream=from_key.stream)
app_service = self.store.get_app_service_by_user_id(user.to_string())
if app_service:

2
synapse/handlers/sync.py
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@ -2333,7 +2333,7 @@ class SyncHandler:
continue
leave_token = now_token.copy_and_replace(
StreamKeyType.ROOM, RoomStreamToken(None, event.stream_ordering)
StreamKeyType.ROOM, RoomStreamToken(stream=event.stream_ordering)
)
room_entries.append(
RoomSyncResultBuilder(

2
synapse/rest/admin/__init__.py
View File

@ -146,7 +146,7 @@ class PurgeHistoryRestServlet(RestServlet):
# RoomStreamToken expects [int] not Optional[int]
assert event.internal_metadata.stream_ordering is not None
room_token = RoomStreamToken(
event.depth, event.internal_metadata.stream_ordering
topological=event.depth, stream=event.internal_metadata.stream_ordering
)
token = await room_token.to_string(self.store)

22
synapse/storage/databases/main/stream.py
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@ -266,7 +266,7 @@ def generate_next_token(
# when we are going backwards so we subtract one from the
# stream part.
last_stream_ordering -= 1
return RoomStreamToken(last_topo_ordering, last_stream_ordering)
return RoomStreamToken(topological=last_topo_ordering, stream=last_stream_ordering)
def _make_generic_sql_bound(
@ -558,7 +558,7 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
if p > min_pos
}
return RoomStreamToken(None, min_pos, immutabledict(positions))
return RoomStreamToken(stream=min_pos, instance_map=immutabledict(positions))
async def get_room_events_stream_for_rooms(
self,
@ -708,7 +708,7 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
ret.reverse()
if rows:
key = RoomStreamToken(None, min(r.stream_ordering for r in rows))
key = RoomStreamToken(stream=min(r.stream_ordering for r in rows))
else:
# Assume we didn't get anything because there was nothing to
# get.
@ -969,7 +969,7 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
topo = await self.db_pool.runInteraction(
"_get_max_topological_txn", self._get_max_topological_txn, room_id
)
return RoomStreamToken(topo, stream_ordering)
return RoomStreamToken(topological=topo, stream=stream_ordering)
@overload
def get_stream_id_for_event_txn(
@ -1033,7 +1033,9 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
retcols=("stream_ordering", "topological_ordering"),
desc="get_topological_token_for_event",
)
return RoomStreamToken(row["topological_ordering"], row["stream_ordering"])
return RoomStreamToken(
topological=row["topological_ordering"], stream=row["stream_ordering"]
)
async def get_current_topological_token(self, room_id: str, stream_key: int) -> int:
"""Gets the topological token in a room after or at the given stream
@ -1114,8 +1116,8 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
else:
topo = None
internal = event.internal_metadata
internal.before = RoomStreamToken(topo, stream - 1)
internal.after = RoomStreamToken(topo, stream)
internal.before = RoomStreamToken(topological=topo, stream=stream - 1)
internal.after = RoomStreamToken(topological=topo, stream=stream)
internal.order = (int(topo) if topo else 0, int(stream))
async def get_events_around(
@ -1191,11 +1193,13 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
# Paginating backwards includes the event at the token, but paginating
# forward doesn't.
before_token = RoomStreamToken(
results["topological_ordering"] - 1, results["stream_ordering"]
topological=results["topological_ordering"] - 1,
stream=results["stream_ordering"],
)
after_token = RoomStreamToken(
results["topological_ordering"], results["stream_ordering"]
topological=results["topological_ordering"],
stream=results["stream_ordering"],
)
rows, start_token = self._paginate_room_events_txn(

132
synapse/types/__init__.py
View File

@ -61,6 +61,8 @@ from synapse.util.cancellation import cancellable
from synapse.util.stringutils import parse_and_validate_server_name
if TYPE_CHECKING:
from typing_extensions import Self
from synapse.appservice.api import ApplicationService
from synapse.storage.databases.main import DataStore, PurgeEventsStore
from synapse.storage.databases.main.appservice import ApplicationServiceWorkerStore
@ -437,7 +439,78 @@ def map_username_to_mxid_localpart(
@attr.s(frozen=True, slots=True, order=False)
class RoomStreamToken:
class AbstractMultiWriterStreamToken(metaclass=abc.ABCMeta):
"""An abstract stream token class for streams that supports multiple
writers.
This works by keeping track of the stream position of each writer,
represented by a default `stream` attribute and a map of instance name to
stream position of any writers that are ahead of the default stream
position.
"""
stream: int = attr.ib(validator=attr.validators.instance_of(int), kw_only=True)
instance_map: "immutabledict[str, int]" = attr.ib(
factory=immutabledict,
validator=attr.validators.deep_mapping(
key_validator=attr.validators.instance_of(str),
value_validator=attr.validators.instance_of(int),
mapping_validator=attr.validators.instance_of(immutabledict),
),
kw_only=True,
)
@classmethod
@abc.abstractmethod
async def parse(cls, store: "DataStore", string: str) -> "Self":
"""Parse the string representation of the token."""
...
@abc.abstractmethod
async def to_string(self, store: "DataStore") -> str:
"""Serialize the token into its string representation."""
...
def copy_and_advance(self, other: "Self") -> "Self":
"""Return a new token such that if an event is after both this token and
the other token, then its after the returned token too.
"""
max_stream = max(self.stream, other.stream)
instance_map = {
instance: max(
self.instance_map.get(instance, self.stream),
other.instance_map.get(instance, other.stream),
)
for instance in set(self.instance_map).union(other.instance_map)
}
return attr.evolve(
self, stream=max_stream, instance_map=immutabledict(instance_map)
)
def get_max_stream_pos(self) -> int:
"""Get the maximum stream position referenced in this token.
The corresponding "min" position is, by definition just `self.stream`.
This is used to handle tokens that have non-empty `instance_map`, and so
reference stream positions after the `self.stream` position.
"""
return max(self.instance_map.values(), default=self.stream)
def get_stream_pos_for_instance(self, instance_name: str) -> int:
"""Get the stream position that the given writer was at at this token."""
# If we don't have an entry for the instance we can assume that it was
# at `self.stream`.
return self.instance_map.get(instance_name, self.stream)
@attr.s(frozen=True, slots=True, order=False)
class RoomStreamToken(AbstractMultiWriterStreamToken):
"""Tokens are positions between events. The token "s1" comes after event 1.
s0 s1
@ -514,16 +587,8 @@ class RoomStreamToken:
topological: Optional[int] = attr.ib(
validator=attr.validators.optional(attr.validators.instance_of(int)),
)
stream: int = attr.ib(validator=attr.validators.instance_of(int))
instance_map: "immutabledict[str, int]" = attr.ib(
factory=immutabledict,
validator=attr.validators.deep_mapping(
key_validator=attr.validators.instance_of(str),
value_validator=attr.validators.instance_of(int),
mapping_validator=attr.validators.instance_of(immutabledict),
),
kw_only=True,
default=None,
)
def __attrs_post_init__(self) -> None:
@ -583,17 +648,7 @@ class RoomStreamToken:
if self.topological or other.topological:
raise Exception("Can't advance topological tokens")
max_stream = max(self.stream, other.stream)
instance_map = {
instance: max(
self.instance_map.get(instance, self.stream),
other.instance_map.get(instance, other.stream),
)
for instance in set(self.instance_map).union(other.instance_map)
}
return RoomStreamToken(None, max_stream, immutabledict(instance_map))
return super().copy_and_advance(other)
def as_historical_tuple(self) -> Tuple[int, int]:
"""Returns a tuple of `(topological, stream)` for historical tokens.
@ -619,16 +674,6 @@ class RoomStreamToken:
# at `self.stream`.
return self.instance_map.get(instance_name, self.stream)
def get_max_stream_pos(self) -> int:
"""Get the maximum stream position referenced in this token.
The corresponding "min" position is, by definition just `self.stream`.
This is used to handle tokens that have non-empty `instance_map`, and so
reference stream positions after the `self.stream` position.
"""
return max(self.instance_map.values(), default=self.stream)
async def to_string(self, store: "DataStore") -> str:
if self.topological is not None:
return "t%d-%d" % (self.topological, self.stream)
@ -838,23 +883,28 @@ class StreamToken:
return getattr(self, key.value)
StreamToken.START = StreamToken(RoomStreamToken(None, 0), 0, 0, 0, 0, 0, 0, 0, 0, 0)
StreamToken.START = StreamToken(RoomStreamToken(stream=0), 0, 0, 0, 0, 0, 0, 0, 0, 0)
@attr.s(slots=True, frozen=True, auto_attribs=True)
class PersistedEventPosition:
class PersistedPosition:
"""Position of a newly persisted row with instance that persisted it."""
instance_name: str
stream: int
def persisted_after(self, token: AbstractMultiWriterStreamToken) -> bool:
return token.get_stream_pos_for_instance(self.instance_name) < self.stream
@attr.s(slots=True, frozen=True, auto_attribs=True)
class PersistedEventPosition(PersistedPosition):
"""Position of a newly persisted event with instance that persisted it.
This can be used to test whether the event is persisted before or after a
RoomStreamToken.
"""
instance_name: str
stream: int
def persisted_after(self, token: RoomStreamToken) -> bool:
return token.get_stream_pos_for_instance(self.instance_name) < self.stream
def to_room_stream_token(self) -> RoomStreamToken:
"""Converts the position to a room stream token such that events
persisted in the same room after this position will be after the
@ -865,7 +915,7 @@ class PersistedEventPosition:
"""
# Doing the naive thing satisfies the desired properties described in
# the docstring.
return RoomStreamToken(None, self.stream)
return RoomStreamToken(stream=self.stream)
@attr.s(slots=True, frozen=True, auto_attribs=True)

8
tests/handlers/test_appservice.py
View File

@ -86,7 +86,7 @@ class AppServiceHandlerTestCase(unittest.TestCase):
[event],
]
)
self.handler.notify_interested_services(RoomStreamToken(None, 1))
self.handler.notify_interested_services(RoomStreamToken(stream=1))
self.mock_scheduler.enqueue_for_appservice.assert_called_once_with(
interested_service, events=[event]
@ -107,7 +107,7 @@ class AppServiceHandlerTestCase(unittest.TestCase):
]
)
self.mock_store.get_events_as_list = AsyncMock(side_effect=[[event]])
self.handler.notify_interested_services(RoomStreamToken(None, 0))
self.handler.notify_interested_services(RoomStreamToken(stream=0))
self.mock_as_api.query_user.assert_called_once_with(services[0], user_id)
@ -126,7 +126,7 @@ class AppServiceHandlerTestCase(unittest.TestCase):
]
)
self.handler.notify_interested_services(RoomStreamToken(None, 0))
self.handler.notify_interested_services(RoomStreamToken(stream=0))
self.assertFalse(
self.mock_as_api.query_user.called,
@ -441,7 +441,7 @@ class ApplicationServicesHandlerSendEventsTestCase(unittest.HomeserverTestCase):
self.get_success(
self.hs.get_application_service_handler()._notify_interested_services(
RoomStreamToken(
None, self.hs.get_application_service_handler().current_max
stream=self.hs.get_application_service_handler().current_max
)
)
)