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5d3850b038
There are a couple of things we need to be careful of here: 1. The current python code does no validation when loading from the DB, so we need to be careful to ignore such errors (at least on jki.re there are some old events with internal metadata fields of the wrong type). 2. We want to be memory efficient, as we often have many hundreds of thousands of events in the cache at a time. --------- Co-authored-by: Quentin Gliech <quenting@element.io>
559 lines
18 KiB
Python
559 lines
18 KiB
Python
#
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# This file is licensed under the Affero General Public License (AGPL) version 3.
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#
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# Copyright (C) 2023 New Vector, Ltd
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# See the GNU Affero General Public License for more details:
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# <https://www.gnu.org/licenses/agpl-3.0.html>.
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#
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# Originally licensed under the Apache License, Version 2.0:
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# <http://www.apache.org/licenses/LICENSE-2.0>.
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#
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# [This file includes modifications made by New Vector Limited]
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#
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#
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import abc
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import collections.abc
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import os
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from typing import (
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TYPE_CHECKING,
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Any,
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Dict,
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Generic,
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Iterable,
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List,
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Optional,
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Tuple,
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Type,
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TypeVar,
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Union,
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overload,
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)
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import attr
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from typing_extensions import Literal
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from unpaddedbase64 import encode_base64
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from synapse.api.constants import RelationTypes
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from synapse.api.room_versions import EventFormatVersions, RoomVersion, RoomVersions
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from synapse.synapse_rust.events import EventInternalMetadata
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from synapse.types import JsonDict, StrCollection
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from synapse.util.caches import intern_dict
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from synapse.util.frozenutils import freeze
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from synapse.util.stringutils import strtobool
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if TYPE_CHECKING:
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from synapse.events.builder import EventBuilder
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# Whether we should use frozen_dict in FrozenEvent. Using frozen_dicts prevents
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# bugs where we accidentally share e.g. signature dicts. However, converting a
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# dict to frozen_dicts is expensive.
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#
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# NOTE: This is overridden by the configuration by the Synapse worker apps, but
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# for the sake of tests, it is set here while it cannot be configured on the
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# homeserver object itself.
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USE_FROZEN_DICTS = strtobool(os.environ.get("SYNAPSE_USE_FROZEN_DICTS", "0"))
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T = TypeVar("T")
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# DictProperty (and DefaultDictProperty) require the classes they're used with to
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# have a _dict property to pull properties from.
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#
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# TODO _DictPropertyInstance should not include EventBuilder but due to
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# https://github.com/python/mypy/issues/5570 it thinks the DictProperty and
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# DefaultDictProperty get applied to EventBuilder when it is in a Union with
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# EventBase. This is the least invasive hack to get mypy to comply.
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#
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# Note that DictProperty/DefaultDictProperty cannot actually be used with
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# EventBuilder as it lacks a _dict property.
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_DictPropertyInstance = Union["EventBase", "EventBuilder"]
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class DictProperty(Generic[T]):
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"""An object property which delegates to the `_dict` within its parent object."""
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__slots__ = ["key"]
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def __init__(self, key: str):
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self.key = key
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@overload
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def __get__(
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self,
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instance: Literal[None],
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owner: Optional[Type[_DictPropertyInstance]] = None,
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) -> "DictProperty":
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...
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@overload
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def __get__(
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self,
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instance: _DictPropertyInstance,
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owner: Optional[Type[_DictPropertyInstance]] = None,
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) -> T:
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...
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def __get__(
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self,
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instance: Optional[_DictPropertyInstance],
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owner: Optional[Type[_DictPropertyInstance]] = None,
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) -> Union[T, "DictProperty"]:
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# if the property is accessed as a class property rather than an instance
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# property, return the property itself rather than the value
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if instance is None:
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return self
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try:
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assert isinstance(instance, EventBase)
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return instance._dict[self.key]
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except KeyError as e1:
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# We want this to look like a regular attribute error (mostly so that
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# hasattr() works correctly), so we convert the KeyError into an
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# AttributeError.
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#
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# To exclude the KeyError from the traceback, we explicitly
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# 'raise from e1.__context__' (which is better than 'raise from None',
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# because that would omit any *earlier* exceptions).
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#
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raise AttributeError(
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"'%s' has no '%s' property" % (type(instance), self.key)
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) from e1.__context__
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def __set__(self, instance: _DictPropertyInstance, v: T) -> None:
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assert isinstance(instance, EventBase)
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instance._dict[self.key] = v
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def __delete__(self, instance: _DictPropertyInstance) -> None:
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assert isinstance(instance, EventBase)
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try:
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del instance._dict[self.key]
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except KeyError as e1:
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raise AttributeError(
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"'%s' has no '%s' property" % (type(instance), self.key)
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) from e1.__context__
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class DefaultDictProperty(DictProperty, Generic[T]):
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"""An extension of DictProperty which provides a default if the property is
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not present in the parent's _dict.
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Note that this means that hasattr() on the property always returns True.
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"""
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__slots__ = ["default"]
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def __init__(self, key: str, default: T):
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super().__init__(key)
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self.default = default
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@overload
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def __get__(
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self,
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instance: Literal[None],
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owner: Optional[Type[_DictPropertyInstance]] = None,
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) -> "DefaultDictProperty":
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...
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@overload
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def __get__(
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self,
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instance: _DictPropertyInstance,
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owner: Optional[Type[_DictPropertyInstance]] = None,
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) -> T:
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...
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def __get__(
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self,
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instance: Optional[_DictPropertyInstance],
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owner: Optional[Type[_DictPropertyInstance]] = None,
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) -> Union[T, "DefaultDictProperty"]:
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if instance is None:
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return self
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assert isinstance(instance, EventBase)
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return instance._dict.get(self.key, self.default)
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class EventBase(metaclass=abc.ABCMeta):
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@property
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@abc.abstractmethod
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def format_version(self) -> int:
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"""The EventFormatVersion implemented by this event"""
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...
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def __init__(
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self,
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event_dict: JsonDict,
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room_version: RoomVersion,
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signatures: Dict[str, Dict[str, str]],
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unsigned: JsonDict,
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internal_metadata_dict: JsonDict,
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rejected_reason: Optional[str],
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):
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assert room_version.event_format == self.format_version
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self.room_version = room_version
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self.signatures = signatures
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self.unsigned = unsigned
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self.rejected_reason = rejected_reason
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self._dict = event_dict
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self.internal_metadata = EventInternalMetadata(internal_metadata_dict)
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depth: DictProperty[int] = DictProperty("depth")
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content: DictProperty[JsonDict] = DictProperty("content")
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hashes: DictProperty[Dict[str, str]] = DictProperty("hashes")
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origin: DictProperty[str] = DictProperty("origin")
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origin_server_ts: DictProperty[int] = DictProperty("origin_server_ts")
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room_id: DictProperty[str] = DictProperty("room_id")
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sender: DictProperty[str] = DictProperty("sender")
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# TODO state_key should be Optional[str]. This is generally asserted in Synapse
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# by calling is_state() first (which ensures it is not None), but it is hard (not possible?)
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# to properly annotate that calling is_state() asserts that state_key exists
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# and is non-None. It would be better to replace such direct references with
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# get_state_key() (and a check for None).
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state_key: DictProperty[str] = DictProperty("state_key")
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type: DictProperty[str] = DictProperty("type")
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user_id: DictProperty[str] = DictProperty("sender")
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@property
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def event_id(self) -> str:
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raise NotImplementedError()
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@property
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def membership(self) -> str:
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return self.content["membership"]
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@property
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def redacts(self) -> Optional[str]:
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"""MSC2176 moved the redacts field into the content."""
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if self.room_version.updated_redaction_rules:
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return self.content.get("redacts")
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return self.get("redacts")
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def is_state(self) -> bool:
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return self.get_state_key() is not None
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def get_state_key(self) -> Optional[str]:
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"""Get the state key of this event, or None if it's not a state event"""
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return self._dict.get("state_key")
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def get_dict(self) -> JsonDict:
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d = dict(self._dict)
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d.update({"signatures": self.signatures, "unsigned": dict(self.unsigned)})
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return d
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def get(self, key: str, default: Optional[Any] = None) -> Any:
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return self._dict.get(key, default)
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def get_internal_metadata_dict(self) -> JsonDict:
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return self.internal_metadata.get_dict()
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def get_pdu_json(self, time_now: Optional[int] = None) -> JsonDict:
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pdu_json = self.get_dict()
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if time_now is not None and "age_ts" in pdu_json["unsigned"]:
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age = time_now - pdu_json["unsigned"]["age_ts"]
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pdu_json.setdefault("unsigned", {})["age"] = int(age)
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del pdu_json["unsigned"]["age_ts"]
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# This may be a frozen event
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pdu_json["unsigned"].pop("redacted_because", None)
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return pdu_json
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def get_templated_pdu_json(self) -> JsonDict:
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"""
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Return a JSON object suitable for a templated event, as used in the
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make_{join,leave,knock} workflow.
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"""
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# By using _dict directly we don't pull in signatures/unsigned.
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template_json = dict(self._dict)
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# The hashes (similar to the signature) need to be recalculated by the
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# joining/leaving/knocking server after (potentially) modifying the
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# event.
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template_json.pop("hashes")
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return template_json
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def __getitem__(self, field: str) -> Optional[Any]:
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return self._dict[field]
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def __contains__(self, field: str) -> bool:
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return field in self._dict
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def items(self) -> List[Tuple[str, Optional[Any]]]:
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return list(self._dict.items())
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def keys(self) -> Iterable[str]:
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return self._dict.keys()
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def prev_event_ids(self) -> List[str]:
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"""Returns the list of prev event IDs. The order matches the order
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specified in the event, though there is no meaning to it.
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Returns:
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The list of event IDs of this event's prev_events
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"""
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return [e for e, _ in self._dict["prev_events"]]
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def auth_event_ids(self) -> StrCollection:
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"""Returns the list of auth event IDs. The order matches the order
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specified in the event, though there is no meaning to it.
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Returns:
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The list of event IDs of this event's auth_events
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"""
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return [e for e, _ in self._dict["auth_events"]]
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def freeze(self) -> None:
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"""'Freeze' the event dict, so it cannot be modified by accident"""
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# this will be a no-op if the event dict is already frozen.
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self._dict = freeze(self._dict)
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def __str__(self) -> str:
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return self.__repr__()
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def __repr__(self) -> str:
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rejection = f"REJECTED={self.rejected_reason}, " if self.rejected_reason else ""
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return (
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f"<{self.__class__.__name__} "
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f"{rejection}"
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f"event_id={self.event_id}, "
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f"type={self.get('type')}, "
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f"state_key={self.get('state_key')}, "
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f"outlier={self.internal_metadata.is_outlier()}"
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">"
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)
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class FrozenEvent(EventBase):
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format_version = EventFormatVersions.ROOM_V1_V2 # All events of this type are V1
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def __init__(
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self,
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event_dict: JsonDict,
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room_version: RoomVersion,
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internal_metadata_dict: Optional[JsonDict] = None,
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rejected_reason: Optional[str] = None,
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):
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internal_metadata_dict = internal_metadata_dict or {}
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event_dict = dict(event_dict)
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# Signatures is a dict of dicts, and this is faster than doing a
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# copy.deepcopy
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signatures = {
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name: dict(sigs.items())
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for name, sigs in event_dict.pop("signatures", {}).items()
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}
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unsigned = dict(event_dict.pop("unsigned", {}))
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# We intern these strings because they turn up a lot (especially when
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# caching).
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event_dict = intern_dict(event_dict)
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if USE_FROZEN_DICTS:
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frozen_dict = freeze(event_dict)
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else:
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frozen_dict = event_dict
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self._event_id = event_dict["event_id"]
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super().__init__(
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frozen_dict,
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room_version=room_version,
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signatures=signatures,
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unsigned=unsigned,
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internal_metadata_dict=internal_metadata_dict,
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rejected_reason=rejected_reason,
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)
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@property
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def event_id(self) -> str:
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return self._event_id
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class FrozenEventV2(EventBase):
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format_version = EventFormatVersions.ROOM_V3 # All events of this type are V2
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def __init__(
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self,
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event_dict: JsonDict,
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room_version: RoomVersion,
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internal_metadata_dict: Optional[JsonDict] = None,
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rejected_reason: Optional[str] = None,
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):
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internal_metadata_dict = internal_metadata_dict or {}
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event_dict = dict(event_dict)
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# Signatures is a dict of dicts, and this is faster than doing a
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# copy.deepcopy
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signatures = {
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name: dict(sigs.items())
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for name, sigs in event_dict.pop("signatures", {}).items()
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}
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assert "event_id" not in event_dict
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unsigned = dict(event_dict.pop("unsigned", {}))
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# We intern these strings because they turn up a lot (especially when
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# caching).
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event_dict = intern_dict(event_dict)
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if USE_FROZEN_DICTS:
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frozen_dict = freeze(event_dict)
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else:
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frozen_dict = event_dict
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self._event_id: Optional[str] = None
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super().__init__(
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frozen_dict,
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room_version=room_version,
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signatures=signatures,
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unsigned=unsigned,
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internal_metadata_dict=internal_metadata_dict,
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rejected_reason=rejected_reason,
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)
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@property
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def event_id(self) -> str:
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# We have to import this here as otherwise we get an import loop which
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# is hard to break.
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from synapse.crypto.event_signing import compute_event_reference_hash
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if self._event_id:
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return self._event_id
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self._event_id = "$" + encode_base64(compute_event_reference_hash(self)[1])
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return self._event_id
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def prev_event_ids(self) -> List[str]:
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"""Returns the list of prev event IDs. The order matches the order
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specified in the event, though there is no meaning to it.
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Returns:
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The list of event IDs of this event's prev_events
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"""
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return self._dict["prev_events"]
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def auth_event_ids(self) -> StrCollection:
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"""Returns the list of auth event IDs. The order matches the order
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specified in the event, though there is no meaning to it.
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Returns:
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The list of event IDs of this event's auth_events
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"""
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return self._dict["auth_events"]
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class FrozenEventV3(FrozenEventV2):
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"""FrozenEventV3, which differs from FrozenEventV2 only in the event_id format"""
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format_version = EventFormatVersions.ROOM_V4_PLUS # All events of this type are V3
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@property
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def event_id(self) -> str:
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# We have to import this here as otherwise we get an import loop which
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# is hard to break.
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from synapse.crypto.event_signing import compute_event_reference_hash
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if self._event_id:
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return self._event_id
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self._event_id = "$" + encode_base64(
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compute_event_reference_hash(self)[1], urlsafe=True
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)
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return self._event_id
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def _event_type_from_format_version(
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format_version: int,
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) -> Type[Union[FrozenEvent, FrozenEventV2, FrozenEventV3]]:
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"""Returns the python type to use to construct an Event object for the
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given event format version.
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Args:
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format_version: The event format version
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Returns:
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A type that can be initialized as per the initializer of `FrozenEvent`
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"""
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if format_version == EventFormatVersions.ROOM_V1_V2:
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return FrozenEvent
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elif format_version == EventFormatVersions.ROOM_V3:
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return FrozenEventV2
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elif format_version == EventFormatVersions.ROOM_V4_PLUS:
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return FrozenEventV3
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else:
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raise Exception("No event format %r" % (format_version,))
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def make_event_from_dict(
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event_dict: JsonDict,
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room_version: RoomVersion = RoomVersions.V1,
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internal_metadata_dict: Optional[JsonDict] = None,
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rejected_reason: Optional[str] = None,
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) -> EventBase:
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"""Construct an EventBase from the given event dict"""
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event_type = _event_type_from_format_version(room_version.event_format)
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return event_type(
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event_dict, room_version, internal_metadata_dict or {}, rejected_reason
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)
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@attr.s(slots=True, frozen=True, auto_attribs=True)
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class _EventRelation:
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# The target event of the relation.
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parent_id: str
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# The relation type.
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rel_type: str
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# The aggregation key. Will be None if the rel_type is not m.annotation or is
|
|
# not a string.
|
|
aggregation_key: Optional[str]
|
|
|
|
|
|
def relation_from_event(event: EventBase) -> Optional[_EventRelation]:
|
|
"""
|
|
Attempt to parse relation information an event.
|
|
|
|
Returns:
|
|
The event relation information, if it is valid. None, otherwise.
|
|
"""
|
|
relation = event.content.get("m.relates_to")
|
|
if not relation or not isinstance(relation, collections.abc.Mapping):
|
|
# No relation information.
|
|
return None
|
|
|
|
# Relations must have a type and parent event ID.
|
|
rel_type = relation.get("rel_type")
|
|
if not isinstance(rel_type, str):
|
|
return None
|
|
|
|
parent_id = relation.get("event_id")
|
|
if not isinstance(parent_id, str):
|
|
return None
|
|
|
|
# Annotations have a key field.
|
|
aggregation_key = None
|
|
if rel_type == RelationTypes.ANNOTATION:
|
|
aggregation_key = relation.get("key")
|
|
if not isinstance(aggregation_key, str):
|
|
aggregation_key = None
|
|
|
|
return _EventRelation(parent_id, rel_type, aggregation_key)
|