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# -*- coding: utf-8 -*-
# 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 os
from distutils.util import strtobool
import six
from synapse.util.caches import intern_dict
from synapse.util.frozenutils import freeze
# Whether we should use frozen_dict in FrozenEvent. Using frozen_dicts prevents
# bugs where we accidentally share e.g. signature dicts. However, converting a
# dict to frozen_dicts is expensive.
#
# NOTE: This is overridden by the configuration by the Synapse worker apps, but
# for the sake of tests, it is set here while it cannot be configured on the
# homeserver object itself.
USE_FROZEN_DICTS = strtobool(os.environ.get("SYNAPSE_USE_FROZEN_DICTS", "0"))
class _EventInternalMetadata(object):
def __init__(self, internal_metadata_dict):
self.__dict__ = dict(internal_metadata_dict)
def get_dict(self):
return dict(self.__dict__)
def is_outlier(self):
return getattr(self, "outlier", False)
def is_invite_from_remote(self):
return getattr(self, "invite_from_remote", False)
def get_send_on_behalf_of(self):
"""Whether this server should send the event on behalf of another server.
This is used by the federation "send_join" API to forward the initial join
event for a server in the room.
returns a str with the name of the server this event is sent on behalf of.
"""
return getattr(self, "send_on_behalf_of", None)
def _event_dict_property(key):
# We want to be able to use hasattr with the event dict properties.
# However, (on python3) hasattr expects AttributeError to be raised. Hence,
# we need to transform the KeyError into an AttributeError
def getter(self):
try:
return self._event_dict[key]
except KeyError:
raise AttributeError(key)
def setter(self, v):
try:
self._event_dict[key] = v
except KeyError:
raise AttributeError(key)
def delete(self):
try:
del self._event_dict[key]
except KeyError:
raise AttributeError(key)
return property(
getter,
setter,
delete,
)
class EventBase(object):
def __init__(self, event_dict, signatures={}, unsigned={},
internal_metadata_dict={}, rejected_reason=None):
self.signatures = signatures
self.unsigned = unsigned
self.rejected_reason = rejected_reason
self._event_dict = event_dict
self.internal_metadata = _EventInternalMetadata(
internal_metadata_dict
)
auth_events = _event_dict_property("auth_events")
depth = _event_dict_property("depth")
content = _event_dict_property("content")
hashes = _event_dict_property("hashes")
origin = _event_dict_property("origin")
origin_server_ts = _event_dict_property("origin_server_ts")
prev_events = _event_dict_property("prev_events")
prev_state = _event_dict_property("prev_state")
redacts = _event_dict_property("redacts")
room_id = _event_dict_property("room_id")
sender = _event_dict_property("sender")
user_id = _event_dict_property("sender")
@property
def membership(self):
return self.content["membership"]
def is_state(self):
return hasattr(self, "state_key") and self.state_key is not None
def get_dict(self):
d = dict(self._event_dict)
d.update({
"signatures": self.signatures,
"unsigned": dict(self.unsigned),
})
return d
def get(self, key, default=None):
return self._event_dict.get(key, default)
def get_internal_metadata_dict(self):
return self.internal_metadata.get_dict()
def get_pdu_json(self, time_now=None):
pdu_json = self.get_dict()
if time_now is not None and "age_ts" in pdu_json["unsigned"]:
age = time_now - pdu_json["unsigned"]["age_ts"]
pdu_json.setdefault("unsigned", {})["age"] = int(age)
del pdu_json["unsigned"]["age_ts"]
# This may be a frozen event
pdu_json["unsigned"].pop("redacted_because", None)
return pdu_json
def __set__(self, instance, value):
raise AttributeError("Unrecognized attribute %s" % (instance,))
def __getitem__(self, field):
return self._event_dict[field]
def __contains__(self, field):
return field in self._event_dict
def items(self):
return list(self._event_dict.items())
def keys(self):
return six.iterkeys(self._event_dict)
class FrozenEvent(EventBase):
def __init__(self, event_dict, internal_metadata_dict={}, rejected_reason=None):
event_dict = dict(event_dict)
# Signatures is a dict of dicts, and this is faster than doing a
# copy.deepcopy
signatures = {
name: {sig_id: sig for sig_id, sig in sigs.items()}
for name, sigs in event_dict.pop("signatures", {}).items()
}
unsigned = dict(event_dict.pop("unsigned", {}))
# We intern these strings because they turn up a lot (especially when
# caching).
event_dict = intern_dict(event_dict)
if USE_FROZEN_DICTS:
frozen_dict = freeze(event_dict)
else:
frozen_dict = event_dict
self.event_id = event_dict["event_id"]
self.type = event_dict["type"]
if "state_key" in event_dict:
self.state_key = event_dict["state_key"]
super(FrozenEvent, self).__init__(
frozen_dict,
signatures=signatures,
unsigned=unsigned,
internal_metadata_dict=internal_metadata_dict,
rejected_reason=rejected_reason,
)
@staticmethod
def from_event(event):
e = FrozenEvent(
event.get_pdu_json()
)
e.internal_metadata = event.internal_metadata
return e
def __str__(self):
return self.__repr__()
def __repr__(self):
return "<FrozenEvent event_id='%s', type='%s', state_key='%s'>" % (
self.get("event_id", None),
self.get("type", None),
self.get("state_key", None),
)
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