493 lines
19 KiB
Python
493 lines
19 KiB
Python
# 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.
|
|
from abc import ABC, abstractmethod
|
|
from typing import TYPE_CHECKING, List, Optional, Tuple
|
|
|
|
import attr
|
|
from frozendict import frozendict
|
|
|
|
from synapse.appservice import ApplicationService
|
|
from synapse.events import EventBase
|
|
from synapse.types import JsonDict, StateMap
|
|
|
|
if TYPE_CHECKING:
|
|
from synapse.storage.controllers import StorageControllers
|
|
from synapse.storage.databases import StateGroupDataStore
|
|
from synapse.storage.databases.main import DataStore
|
|
from synapse.types.state import StateFilter
|
|
|
|
|
|
class UnpersistedEventContextBase(ABC):
|
|
"""
|
|
This is a base class for EventContext and UnpersistedEventContext, objects which
|
|
hold information relevant to storing an associated event. Note that an
|
|
UnpersistedEventContexts must be converted into an EventContext before it is
|
|
suitable to send to the db with its associated event.
|
|
|
|
Attributes:
|
|
_storage: storage controllers for interfacing with the database
|
|
app_service: If the associated event is being sent by a (local) application service, that
|
|
app service.
|
|
"""
|
|
|
|
def __init__(self, storage_controller: "StorageControllers"):
|
|
self._storage: "StorageControllers" = storage_controller
|
|
self.app_service: Optional[ApplicationService] = None
|
|
|
|
@abstractmethod
|
|
async def persist(
|
|
self,
|
|
event: EventBase,
|
|
) -> "EventContext":
|
|
"""
|
|
A method to convert an UnpersistedEventContext to an EventContext, suitable for
|
|
sending to the database with the associated event.
|
|
"""
|
|
pass
|
|
|
|
@abstractmethod
|
|
async def get_prev_state_ids(
|
|
self, state_filter: Optional["StateFilter"] = None
|
|
) -> StateMap[str]:
|
|
"""
|
|
Gets the room state at the event (ie not including the event if the event is a
|
|
state event).
|
|
|
|
Args:
|
|
state_filter: specifies the type of state event to fetch from DB, example:
|
|
EventTypes.JoinRules
|
|
"""
|
|
pass
|
|
|
|
|
|
@attr.s(slots=True, auto_attribs=True)
|
|
class EventContext(UnpersistedEventContextBase):
|
|
"""
|
|
Holds information relevant to persisting an event
|
|
|
|
Attributes:
|
|
rejected: A rejection reason if the event was rejected, else None
|
|
|
|
_state_group: The ID of the state group for this event. Note that state events
|
|
are persisted with a state group which includes the new event, so this is
|
|
effectively the state *after* the event in question.
|
|
|
|
For a *rejected* state event, where the state of the rejected event is
|
|
ignored, this state_group should never make it into the
|
|
event_to_state_groups table. Indeed, inspecting this value for a rejected
|
|
state event is almost certainly incorrect.
|
|
|
|
For an outlier, where we don't have the state at the event, this will be
|
|
None.
|
|
|
|
Note that this is a private attribute: it should be accessed via
|
|
the ``state_group`` property.
|
|
|
|
state_group_before_event: The ID of the state group representing the state
|
|
of the room before this event.
|
|
|
|
If this is a non-state event, this will be the same as ``state_group``. If
|
|
it's a state event, it will be the same as ``prev_group``.
|
|
|
|
If ``state_group`` is None (ie, the event is an outlier),
|
|
``state_group_before_event`` will always also be ``None``.
|
|
|
|
state_delta_due_to_event: If `state_group` and `state_group_before_event` are not None
|
|
then this is the delta of the state between the two groups.
|
|
|
|
prev_group: If it is known, ``state_group``'s prev_group. Note that this being
|
|
None does not necessarily mean that ``state_group`` does not have
|
|
a prev_group!
|
|
|
|
If the event is a state event, this is normally the same as
|
|
``state_group_before_event``.
|
|
|
|
If ``state_group`` is None (ie, the event is an outlier), ``prev_group``
|
|
will always also be ``None``.
|
|
|
|
Note that this *not* (necessarily) the state group associated with
|
|
``_prev_state_ids``.
|
|
|
|
delta_ids: If ``prev_group`` is not None, the state delta between ``prev_group``
|
|
and ``state_group``.
|
|
|
|
partial_state: if True, we may be storing this event with a temporary,
|
|
incomplete state.
|
|
"""
|
|
|
|
_storage: "StorageControllers"
|
|
rejected: Optional[str] = None
|
|
_state_group: Optional[int] = None
|
|
state_group_before_event: Optional[int] = None
|
|
_state_delta_due_to_event: Optional[StateMap[str]] = None
|
|
prev_group: Optional[int] = None
|
|
delta_ids: Optional[StateMap[str]] = None
|
|
app_service: Optional[ApplicationService] = None
|
|
|
|
partial_state: bool = False
|
|
|
|
@staticmethod
|
|
def with_state(
|
|
storage: "StorageControllers",
|
|
state_group: Optional[int],
|
|
state_group_before_event: Optional[int],
|
|
state_delta_due_to_event: Optional[StateMap[str]],
|
|
partial_state: bool,
|
|
prev_group: Optional[int] = None,
|
|
delta_ids: Optional[StateMap[str]] = None,
|
|
) -> "EventContext":
|
|
return EventContext(
|
|
storage=storage,
|
|
state_group=state_group,
|
|
state_group_before_event=state_group_before_event,
|
|
state_delta_due_to_event=state_delta_due_to_event,
|
|
prev_group=prev_group,
|
|
delta_ids=delta_ids,
|
|
partial_state=partial_state,
|
|
)
|
|
|
|
@staticmethod
|
|
def for_outlier(
|
|
storage: "StorageControllers",
|
|
) -> "EventContext":
|
|
"""Return an EventContext instance suitable for persisting an outlier event"""
|
|
return EventContext(storage=storage)
|
|
|
|
async def persist(self, event: EventBase) -> "EventContext":
|
|
return self
|
|
|
|
async def serialize(self, event: EventBase, store: "DataStore") -> JsonDict:
|
|
"""Converts self to a type that can be serialized as JSON, and then
|
|
deserialized by `deserialize`
|
|
|
|
Args:
|
|
event: The event that this context relates to
|
|
|
|
Returns:
|
|
The serialized event.
|
|
"""
|
|
|
|
return {
|
|
"state_group": self._state_group,
|
|
"state_group_before_event": self.state_group_before_event,
|
|
"rejected": self.rejected,
|
|
"prev_group": self.prev_group,
|
|
"state_delta_due_to_event": _encode_state_dict(
|
|
self._state_delta_due_to_event
|
|
),
|
|
"delta_ids": _encode_state_dict(self.delta_ids),
|
|
"app_service_id": self.app_service.id if self.app_service else None,
|
|
"partial_state": self.partial_state,
|
|
}
|
|
|
|
@staticmethod
|
|
def deserialize(storage: "StorageControllers", input: JsonDict) -> "EventContext":
|
|
"""Converts a dict that was produced by `serialize` back into a
|
|
EventContext.
|
|
|
|
Args:
|
|
storage: Used to convert AS ID to AS object and fetch state.
|
|
input: A dict produced by `serialize`
|
|
|
|
Returns:
|
|
The event context.
|
|
"""
|
|
context = EventContext(
|
|
# We use the state_group and prev_state_id stuff to pull the
|
|
# current_state_ids out of the DB and construct prev_state_ids.
|
|
storage=storage,
|
|
state_group=input["state_group"],
|
|
state_group_before_event=input["state_group_before_event"],
|
|
prev_group=input["prev_group"],
|
|
state_delta_due_to_event=_decode_state_dict(
|
|
input["state_delta_due_to_event"]
|
|
),
|
|
delta_ids=_decode_state_dict(input["delta_ids"]),
|
|
rejected=input["rejected"],
|
|
partial_state=input.get("partial_state", False),
|
|
)
|
|
|
|
app_service_id = input["app_service_id"]
|
|
if app_service_id:
|
|
context.app_service = storage.main.get_app_service_by_id(app_service_id)
|
|
|
|
return context
|
|
|
|
@property
|
|
def state_group(self) -> Optional[int]:
|
|
"""The ID of the state group for this event.
|
|
|
|
Note that state events are persisted with a state group which includes the new
|
|
event, so this is effectively the state *after* the event in question.
|
|
|
|
For an outlier, where we don't have the state at the event, this will be None.
|
|
|
|
It is an error to access this for a rejected event, since rejected state should
|
|
not make it into the room state. Accessing this property will raise an exception
|
|
if ``rejected`` is set.
|
|
"""
|
|
if self.rejected:
|
|
raise RuntimeError("Attempt to access state_group of rejected event")
|
|
|
|
return self._state_group
|
|
|
|
async def get_current_state_ids(
|
|
self, state_filter: Optional["StateFilter"] = None
|
|
) -> Optional[StateMap[str]]:
|
|
"""
|
|
Gets the room state map, including this event - ie, the state in ``state_group``
|
|
|
|
It is an error to access this for a rejected event, since rejected state should
|
|
not make it into the room state. This method will raise an exception if
|
|
``rejected`` is set.
|
|
|
|
Arg:
|
|
state_filter: specifies the type of state event to fetch from DB, example: EventTypes.JoinRules
|
|
|
|
Returns:
|
|
Returns None if state_group is None, which happens when the associated
|
|
event is an outlier.
|
|
|
|
Maps a (type, state_key) to the event ID of the state event matching
|
|
this tuple.
|
|
"""
|
|
if self.rejected:
|
|
raise RuntimeError("Attempt to access state_ids of rejected event")
|
|
|
|
assert self._state_delta_due_to_event is not None
|
|
|
|
prev_state_ids = await self.get_prev_state_ids(state_filter)
|
|
|
|
if self._state_delta_due_to_event:
|
|
prev_state_ids = dict(prev_state_ids)
|
|
prev_state_ids.update(self._state_delta_due_to_event)
|
|
|
|
return prev_state_ids
|
|
|
|
async def get_prev_state_ids(
|
|
self, state_filter: Optional["StateFilter"] = None
|
|
) -> StateMap[str]:
|
|
"""
|
|
Gets the room state map, excluding this event.
|
|
|
|
For a non-state event, this will be the same as get_current_state_ids().
|
|
|
|
Args:
|
|
state_filter: specifies the type of state event to fetch from DB, example: EventTypes.JoinRules
|
|
|
|
Returns:
|
|
Returns {} if state_group is None, which happens when the associated
|
|
event is an outlier.
|
|
|
|
Maps a (type, state_key) to the event ID of the state event matching
|
|
this tuple.
|
|
"""
|
|
|
|
assert self.state_group_before_event is not None
|
|
return await self._storage.state.get_state_ids_for_group(
|
|
self.state_group_before_event, state_filter
|
|
)
|
|
|
|
|
|
@attr.s(slots=True, auto_attribs=True)
|
|
class UnpersistedEventContext(UnpersistedEventContextBase):
|
|
"""
|
|
The event context holds information about the state groups for an event. It is important
|
|
to remember that an event technically has two state groups: the state group before the
|
|
event, and the state group after the event. If the event is not a state event, the state
|
|
group will not change (ie the state group before the event will be the same as the state
|
|
group after the event), but if it is a state event the state group before the event
|
|
will differ from the state group after the event.
|
|
This is a version of an EventContext before the new state group (if any) has been
|
|
computed and stored. It contains information about the state before the event (which
|
|
also may be the information after the event, if the event is not a state event). The
|
|
UnpersistedEventContext must be converted into an EventContext by calling the method
|
|
'persist' on it before it is suitable to be sent to the DB for processing.
|
|
|
|
state_group_after_event:
|
|
The state group after the event. This will always be None until it is persisted.
|
|
If the event is not a state event, this will be the same as
|
|
state_group_before_event.
|
|
|
|
state_group_before_event:
|
|
The ID of the state group representing the state of the room before this event.
|
|
|
|
state_delta_due_to_event:
|
|
If the event is a state event, then this is the delta of the state between
|
|
`state_group` and `state_group_before_event`
|
|
|
|
prev_group_for_state_group_before_event:
|
|
If it is known, ``state_group_before_event``'s previous state group.
|
|
|
|
delta_ids_to_state_group_before_event:
|
|
If ``prev_group_for_state_group_before_event`` is not None, the state delta
|
|
between ``prev_group_for_state_group_before_event`` and ``state_group_before_event``.
|
|
|
|
partial_state:
|
|
Whether the event has partial state.
|
|
|
|
state_map_before_event:
|
|
A map of the state before the event, i.e. the state at `state_group_before_event`
|
|
"""
|
|
|
|
_storage: "StorageControllers"
|
|
state_group_before_event: Optional[int]
|
|
state_group_after_event: Optional[int]
|
|
state_delta_due_to_event: Optional[dict]
|
|
prev_group_for_state_group_before_event: Optional[int]
|
|
delta_ids_to_state_group_before_event: Optional[StateMap[str]]
|
|
partial_state: bool
|
|
state_map_before_event: Optional[StateMap[str]] = None
|
|
|
|
@classmethod
|
|
async def batch_persist_unpersisted_contexts(
|
|
cls,
|
|
events_and_context: List[Tuple[EventBase, "UnpersistedEventContextBase"]],
|
|
room_id: str,
|
|
last_known_state_group: int,
|
|
datastore: "StateGroupDataStore",
|
|
) -> List[Tuple[EventBase, EventContext]]:
|
|
"""
|
|
Takes a list of events and their associated unpersisted contexts and persists
|
|
the unpersisted contexts, returning a list of events and persisted contexts.
|
|
Note that all the events must be in a linear chain (ie a <- b <- c).
|
|
|
|
Args:
|
|
events_and_context: A list of events and their unpersisted contexts
|
|
room_id: the room_id for the events
|
|
last_known_state_group: the last persisted state group
|
|
datastore: a state datastore
|
|
"""
|
|
amended_events_and_context = await datastore.store_state_deltas_for_batched(
|
|
events_and_context, room_id, last_known_state_group
|
|
)
|
|
|
|
events_and_persisted_context = []
|
|
for event, unpersisted_context in amended_events_and_context:
|
|
if event.is_state():
|
|
context = EventContext(
|
|
storage=unpersisted_context._storage,
|
|
state_group=unpersisted_context.state_group_after_event,
|
|
state_group_before_event=unpersisted_context.state_group_before_event,
|
|
state_delta_due_to_event=unpersisted_context.state_delta_due_to_event,
|
|
partial_state=unpersisted_context.partial_state,
|
|
prev_group=unpersisted_context.state_group_before_event,
|
|
delta_ids=unpersisted_context.state_delta_due_to_event,
|
|
)
|
|
else:
|
|
context = EventContext(
|
|
storage=unpersisted_context._storage,
|
|
state_group=unpersisted_context.state_group_after_event,
|
|
state_group_before_event=unpersisted_context.state_group_before_event,
|
|
state_delta_due_to_event=unpersisted_context.state_delta_due_to_event,
|
|
partial_state=unpersisted_context.partial_state,
|
|
prev_group=unpersisted_context.prev_group_for_state_group_before_event,
|
|
delta_ids=unpersisted_context.delta_ids_to_state_group_before_event,
|
|
)
|
|
events_and_persisted_context.append((event, context))
|
|
return events_and_persisted_context
|
|
|
|
async def get_prev_state_ids(
|
|
self, state_filter: Optional["StateFilter"] = None
|
|
) -> StateMap[str]:
|
|
"""
|
|
Gets the room state map, excluding this event.
|
|
|
|
Args:
|
|
state_filter: specifies the type of state event to fetch from DB
|
|
|
|
Returns:
|
|
Maps a (type, state_key) to the event ID of the state event matching
|
|
this tuple.
|
|
"""
|
|
if self.state_map_before_event:
|
|
return self.state_map_before_event
|
|
|
|
assert self.state_group_before_event is not None
|
|
return await self._storage.state.get_state_ids_for_group(
|
|
self.state_group_before_event, state_filter
|
|
)
|
|
|
|
async def persist(self, event: EventBase) -> EventContext:
|
|
"""
|
|
Creates a full `EventContext` for the event, persisting any referenced state that
|
|
has not yet been persisted.
|
|
|
|
Args:
|
|
event: event that the EventContext is associated with.
|
|
|
|
Returns: An EventContext suitable for sending to the database with the event
|
|
for persisting
|
|
"""
|
|
assert self.partial_state is not None
|
|
|
|
# If we have a full set of state for before the event but don't have a state
|
|
# group for that state, we need to get one
|
|
if self.state_group_before_event is None:
|
|
assert self.state_map_before_event
|
|
state_group_before_event = await self._storage.state.store_state_group(
|
|
event.event_id,
|
|
event.room_id,
|
|
prev_group=self.prev_group_for_state_group_before_event,
|
|
delta_ids=self.delta_ids_to_state_group_before_event,
|
|
current_state_ids=self.state_map_before_event,
|
|
)
|
|
self.state_group_before_event = state_group_before_event
|
|
|
|
# if the event isn't a state event the state group doesn't change
|
|
if not self.state_delta_due_to_event:
|
|
state_group_after_event = self.state_group_before_event
|
|
|
|
# otherwise if it is a state event we need to get a state group for it
|
|
else:
|
|
state_group_after_event = await self._storage.state.store_state_group(
|
|
event.event_id,
|
|
event.room_id,
|
|
prev_group=self.state_group_before_event,
|
|
delta_ids=self.state_delta_due_to_event,
|
|
current_state_ids=None,
|
|
)
|
|
|
|
return EventContext.with_state(
|
|
storage=self._storage,
|
|
state_group=state_group_after_event,
|
|
state_group_before_event=self.state_group_before_event,
|
|
state_delta_due_to_event=self.state_delta_due_to_event,
|
|
partial_state=self.partial_state,
|
|
prev_group=self.state_group_before_event,
|
|
delta_ids=self.state_delta_due_to_event,
|
|
)
|
|
|
|
|
|
def _encode_state_dict(
|
|
state_dict: Optional[StateMap[str]],
|
|
) -> Optional[List[Tuple[str, str, str]]]:
|
|
"""Since dicts of (type, state_key) -> event_id cannot be serialized in
|
|
JSON we need to convert them to a form that can.
|
|
"""
|
|
if state_dict is None:
|
|
return None
|
|
|
|
return [(etype, state_key, v) for (etype, state_key), v in state_dict.items()]
|
|
|
|
|
|
def _decode_state_dict(
|
|
input: Optional[List[Tuple[str, str, str]]]
|
|
) -> Optional[StateMap[str]]:
|
|
"""Decodes a state dict encoded using `_encode_state_dict` above"""
|
|
if input is None:
|
|
return None
|
|
|
|
return frozendict({(etype, state_key): v for etype, state_key, v in input})
|