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synapse-old/synapse/federation/transport/client.py

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# Copyright 2014-2022 The Matrix.org Foundation C.I.C.
# Copyright 2020 Sorunome
#
# 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 logging
import urllib
from typing import (
TYPE_CHECKING,
Any,
Callable,
Collection,
Dict,
Generator,
Iterable,
List,
Mapping,
Optional,
Tuple,
Union,
)
import attr
import ijson
from synapse.api.constants import Direction, Membership
from synapse.api.errors import Codes, HttpResponseException, SynapseError
from synapse.api.room_versions import RoomVersion
from synapse.api.urls import (
FEDERATION_UNSTABLE_PREFIX,
FEDERATION_V1_PREFIX,
FEDERATION_V2_PREFIX,
)
from synapse.events import EventBase, make_event_from_dict
from synapse.federation.units import Transaction
from synapse.http.matrixfederationclient import ByteParser, LegacyJsonSendParser
from synapse.http.types import QueryParams
from synapse.types import JsonDict
from synapse.util import ExceptionBundle
if TYPE_CHECKING:
from synapse.app.homeserver import HomeServer
logger = logging.getLogger(__name__)
class TransportLayerClient:
"""Sends federation HTTP requests to other servers"""
def __init__(self, hs: "HomeServer"):
self.client = hs.get_federation_http_client()
self._faster_joins_enabled = hs.config.experimental.faster_joins_enabled
self._is_mine_server_name = hs.is_mine_server_name
async def get_room_state_ids(
self, destination: str, room_id: str, event_id: str
) -> JsonDict:
"""Requests the IDs of all state for a given room at the given event.
Args:
destination: The host name of the remote homeserver we want
to get the state from.
room_id: the room we want the state of
event_id: The event we want the context at.
Returns:
Results in a dict received from the remote homeserver.
"""
logger.debug("get_room_state_ids dest=%s, room=%s", destination, room_id)
path = _create_v1_path("/state_ids/%s", room_id)
return await self.client.get_json(
destination,
path=path,
args={"event_id": event_id},
try_trailing_slash_on_400=True,
)
async def get_room_state(
self, room_version: RoomVersion, destination: str, room_id: str, event_id: str
) -> "StateRequestResponse":
"""Requests the full state for a given room at the given event.
Args:
room_version: the version of the room (required to build the event objects)
destination: The host name of the remote homeserver we want
to get the state from.
room_id: the room we want the state of
event_id: The event we want the context at.
Returns:
Results in a dict received from the remote homeserver.
"""
path = _create_v1_path("/state/%s", room_id)
return await self.client.get_json(
destination,
path=path,
args={"event_id": event_id},
# This can take a looooooong time for large rooms. Give this a generous
# timeout of 10 minutes to avoid the partial state resync timing out early
# and trying a bunch of servers who haven't seen our join yet.
timeout=600_000,
parser=_StateParser(room_version),
)
async def get_event(
self, destination: str, event_id: str, timeout: Optional[int] = None
) -> JsonDict:
"""Requests the pdu with give id and origin from the given server.
Args:
destination: The host name of the remote homeserver we want
to get the state from.
event_id: The id of the event being requested.
timeout: How long to try (in ms) the destination for before
giving up. None indicates no timeout.
Returns:
Results in a dict received from the remote homeserver.
"""
logger.debug("get_pdu dest=%s, event_id=%s", destination, event_id)
path = _create_v1_path("/event/%s", event_id)
return await self.client.get_json(
destination, path=path, timeout=timeout, try_trailing_slash_on_400=True
)
async def backfill(
self, destination: str, room_id: str, event_tuples: Collection[str], limit: int
) -> Optional[Union[JsonDict, list]]:
"""Requests `limit` previous PDUs in a given context before list of
PDUs.
Args:
destination
room_id
event_tuples:
Must be a Collection that is falsy when empty.
(Iterable is not enough here!)
limit
Returns:
Results in a dict received from the remote homeserver.
"""
logger.debug(
"backfill dest=%s, room_id=%s, event_tuples=%r, limit=%s",
destination,
room_id,
event_tuples,
str(limit),
)
if not event_tuples:
# TODO: raise?
return None
path = _create_v1_path("/backfill/%s", room_id)
args = {"v": event_tuples, "limit": [str(limit)]}
return await self.client.get_json(
destination, path=path, args=args, try_trailing_slash_on_400=True
)
async def timestamp_to_event(
self, destination: str, room_id: str, timestamp: int, direction: Direction
) -> Union[JsonDict, List]:
"""
Calls a remote federating server at `destination` asking for their
closest event to the given timestamp in the given direction.
Args:
destination: Domain name of the remote homeserver
room_id: Room to fetch the event from
timestamp: The point in time (inclusive) we should navigate from in
the given direction to find the closest event.
direction: indicates whether we should navigate forward
or backward from the given timestamp to find the closest event.
Returns:
Response dict received from the remote homeserver.
Raises:
Various exceptions when the request fails
"""
path = _create_v1_path(
"/timestamp_to_event/%s",
room_id,
)
args = {"ts": [str(timestamp)], "dir": [direction.value]}
remote_response = await self.client.get_json(
destination, path=path, args=args, try_trailing_slash_on_400=True
)
return remote_response
async def send_transaction(
self,
transaction: Transaction,
json_data_callback: Optional[Callable[[], JsonDict]] = None,
) -> JsonDict:
"""Sends the given Transaction to its destination
Args:
transaction
Returns:
Succeeds when we get a 2xx HTTP response. The result
will be the decoded JSON body.
Fails with ``HTTPRequestException`` if we get an HTTP response
code >= 300.
Fails with ``NotRetryingDestination`` if we are not yet ready
to retry this server.
Fails with ``FederationDeniedError`` if this destination
is not on our federation whitelist
"""
logger.debug(
"send_data dest=%s, txid=%s",
transaction.destination,
transaction.transaction_id,
)
if self._is_mine_server_name(transaction.destination):
raise RuntimeError("Transport layer cannot send to itself!")
# FIXME: This is only used by the tests. The actual json sent is
# generated by the json_data_callback.
json_data = transaction.get_dict()
path = _create_v1_path("/send/%s", transaction.transaction_id)
return await self.client.put_json(
transaction.destination,
path=path,
data=json_data,
json_data_callback=json_data_callback,
long_retries=True,
backoff_on_404=True, # If we get a 404 the other side has gone
try_trailing_slash_on_400=True,
)
async def make_query(
self,
destination: str,
query_type: str,
args: QueryParams,
retry_on_dns_fail: bool,
ignore_backoff: bool = False,
prefix: str = FEDERATION_V1_PREFIX,
) -> JsonDict:
path = _create_path(prefix, "/query/%s", query_type)
return await self.client.get_json(
destination=destination,
path=path,
args=args,
retry_on_dns_fail=retry_on_dns_fail,
timeout=10000,
ignore_backoff=ignore_backoff,
)
async def make_membership_event(
self,
destination: str,
room_id: str,
user_id: str,
membership: str,
params: Optional[Mapping[str, Union[str, Iterable[str]]]],
) -> JsonDict:
"""Asks a remote server to build and sign us a membership event
Note that this does not append any events to any graphs.
Args:
destination: address of remote homeserver
room_id: room to join/leave
user_id: user to be joined/left
membership: one of join/leave
params: Query parameters to include in the request.
Returns:
Succeeds when we get a 2xx HTTP response. The result
will be the decoded JSON body (ie, the new event).
Fails with ``HTTPRequestException`` if we get an HTTP response
code >= 300.
Fails with ``NotRetryingDestination`` if we are not yet ready
to retry this server.
Fails with ``FederationDeniedError`` if the remote destination
is not in our federation whitelist
"""
valid_memberships = {Membership.JOIN, Membership.LEAVE, Membership.KNOCK}
if membership not in valid_memberships:
raise RuntimeError(
"make_membership_event called with membership='%s', must be one of %s"
% (membership, ",".join(valid_memberships))
)
path = _create_v1_path("/make_%s/%s/%s", membership, room_id, user_id)
ignore_backoff = False
retry_on_dns_fail = False
if membership == Membership.LEAVE:
# we particularly want to do our best to send leave events. The
# problem is that if it fails, we won't retry it later, so if the
# remote server was just having a momentary blip, the room will be
# out of sync.
ignore_backoff = True
retry_on_dns_fail = True
return await self.client.get_json(
destination=destination,
path=path,
args=params,
retry_on_dns_fail=retry_on_dns_fail,
timeout=20000,
ignore_backoff=ignore_backoff,
)
async def send_join_v1(
self,
room_version: RoomVersion,
destination: str,
room_id: str,
event_id: str,
content: JsonDict,
) -> "SendJoinResponse":
path = _create_v1_path("/send_join/%s/%s", room_id, event_id)
return await self.client.put_json(
destination=destination,
path=path,
data=content,
parser=SendJoinParser(room_version, v1_api=True),
)
async def send_join_v2(
self,
room_version: RoomVersion,
destination: str,
room_id: str,
event_id: str,
content: JsonDict,
omit_members: bool,
) -> "SendJoinResponse":
path = _create_v2_path("/send_join/%s/%s", room_id, event_id)
query_params: Dict[str, str] = {}
if self._faster_joins_enabled:
# lazy-load state on join
query_params["org.matrix.msc3706.partial_state"] = (
"true" if omit_members else "false"
)
query_params["omit_members"] = "true" if omit_members else "false"
return await self.client.put_json(
destination=destination,
path=path,
args=query_params,
data=content,
parser=SendJoinParser(room_version, v1_api=False),
)
async def send_leave_v1(
self, destination: str, room_id: str, event_id: str, content: JsonDict
) -> Tuple[int, JsonDict]:
path = _create_v1_path("/send_leave/%s/%s", room_id, event_id)
return await self.client.put_json(
destination=destination,
path=path,
data=content,
# we want to do our best to send this through. The problem is
# that if it fails, we won't retry it later, so if the remote
# server was just having a momentary blip, the room will be out of
# sync.
ignore_backoff=True,
parser=LegacyJsonSendParser(),
)
async def send_leave_v2(
self, destination: str, room_id: str, event_id: str, content: JsonDict
) -> JsonDict:
path = _create_v2_path("/send_leave/%s/%s", room_id, event_id)
return await self.client.put_json(
destination=destination,
path=path,
data=content,
# we want to do our best to send this through. The problem is
# that if it fails, we won't retry it later, so if the remote
# server was just having a momentary blip, the room will be out of
# sync.
ignore_backoff=True,
)
async def send_knock_v1(
self,
destination: str,
room_id: str,
event_id: str,
content: JsonDict,
) -> JsonDict:
"""
Sends a signed knock membership event to a remote server. This is the second
step for knocking after make_knock.
Args:
destination: The remote homeserver.
room_id: The ID of the room to knock on.
event_id: The ID of the knock membership event that we're sending.
content: The knock membership event that we're sending. Note that this is not the
`content` field of the membership event, but the entire signed membership event
itself represented as a JSON dict.
Returns:
The remote homeserver can optionally return some state from the room. The response
dictionary is in the form:
{"knock_state_events": [<state event dict>, ...]}
The list of state events may be empty.
"""
path = _create_v1_path("/send_knock/%s/%s", room_id, event_id)
return await self.client.put_json(
destination=destination, path=path, data=content
)
async def send_invite_v1(
self, destination: str, room_id: str, event_id: str, content: JsonDict
) -> Tuple[int, JsonDict]:
path = _create_v1_path("/invite/%s/%s", room_id, event_id)
return await self.client.put_json(
destination=destination,
path=path,
data=content,
ignore_backoff=True,
parser=LegacyJsonSendParser(),
)
async def send_invite_v2(
self, destination: str, room_id: str, event_id: str, content: JsonDict
) -> JsonDict:
path = _create_v2_path("/invite/%s/%s", room_id, event_id)
return await self.client.put_json(
destination=destination, path=path, data=content, ignore_backoff=True
)
async def get_public_rooms(
self,
remote_server: str,
limit: Optional[int] = None,
since_token: Optional[str] = None,
search_filter: Optional[Dict] = None,
include_all_networks: bool = False,
third_party_instance_id: Optional[str] = None,
) -> JsonDict:
"""Get the list of public rooms from a remote homeserver
See synapse.federation.federation_client.FederationClient.get_public_rooms for
more information.
"""
if search_filter:
# this uses MSC2197 (Search Filtering over Federation)
path = _create_v1_path("/publicRooms")
data: Dict[str, Any] = {
"include_all_networks": "true" if include_all_networks else "false"
}
if third_party_instance_id:
data["third_party_instance_id"] = third_party_instance_id
if limit:
data["limit"] = limit
if since_token:
data["since"] = since_token
data["filter"] = search_filter
try:
response = await self.client.post_json(
destination=remote_server, path=path, data=data, ignore_backoff=True
)
except HttpResponseException as e:
if e.code == 403:
raise SynapseError(
403,
"You are not allowed to view the public rooms list of %s"
% (remote_server,),
errcode=Codes.FORBIDDEN,
)
raise
else:
path = _create_v1_path("/publicRooms")
args: Dict[str, Union[str, Iterable[str]]] = {
"include_all_networks": "true" if include_all_networks else "false"
}
if third_party_instance_id:
args["third_party_instance_id"] = (third_party_instance_id,)
if limit:
args["limit"] = [str(limit)]
if since_token:
args["since"] = [since_token]
try:
response = await self.client.get_json(
destination=remote_server, path=path, args=args, ignore_backoff=True
)
except HttpResponseException as e:
if e.code == 403:
raise SynapseError(
403,
"You are not allowed to view the public rooms list of %s"
% (remote_server,),
errcode=Codes.FORBIDDEN,
)
raise
return response
async def exchange_third_party_invite(
self, destination: str, room_id: str, event_dict: JsonDict
) -> JsonDict:
path = _create_v1_path("/exchange_third_party_invite/%s", room_id)
return await self.client.put_json(
destination=destination, path=path, data=event_dict
)
async def get_event_auth(
self, destination: str, room_id: str, event_id: str
) -> JsonDict:
path = _create_v1_path("/event_auth/%s/%s", room_id, event_id)
return await self.client.get_json(destination=destination, path=path)
async def query_client_keys(
self, destination: str, query_content: JsonDict, timeout: int
) -> JsonDict:
"""Query the device keys for a list of user ids hosted on a remote
server.
Request:
{
"device_keys": {
"<user_id>": ["<device_id>"]
}
}
Response:
{
"device_keys": {
"<user_id>": {
"<device_id>": {...}
}
},
"master_key": {
"<user_id>": {...}
}
},
"self_signing_key": {
"<user_id>": {...}
}
}
Args:
destination: The server to query.
query_content: The user ids to query.
Returns:
A dict containing device and cross-signing keys.
"""
path = _create_v1_path("/user/keys/query")
return await self.client.post_json(
destination=destination, path=path, data=query_content, timeout=timeout
)
async def query_user_devices(
self, destination: str, user_id: str, timeout: int
) -> JsonDict:
"""Query the devices for a user id hosted on a remote server.
Response:
{
"stream_id": "...",
"devices": [ { ... } ],
"master_key": {
"user_id": "<user_id>",
"usage": [...],
"keys": {...},
"signatures": {
"<user_id>": {...}
}
},
"self_signing_key": {
"user_id": "<user_id>",
"usage": [...],
"keys": {...},
"signatures": {
"<user_id>": {...}
}
}
}
Args:
destination: The server to query.
query_content: The user ids to query.
Returns:
A dict containing device and cross-signing keys.
"""
path = _create_v1_path("/user/devices/%s", user_id)
return await self.client.get_json(
destination=destination, path=path, timeout=timeout
)
async def claim_client_keys(
self, destination: str, query_content: JsonDict, timeout: Optional[int]
) -> JsonDict:
"""Claim one-time keys for a list of devices hosted on a remote server.
Request:
{
"one_time_keys": {
"<user_id>": {
"<device_id>": "<algorithm>"
}
}
}
Response:
{
"one_time_keys": {
"<user_id>": {
"<device_id>": {
"<algorithm>:<key_id>": <OTK JSON>
}
}
}
}
Args:
destination: The server to query.
query_content: The user ids to query.
Returns:
A dict containing the one-time keys.
"""
path = _create_v1_path("/user/keys/claim")
return await self.client.post_json(
destination=destination,
path=path,
data={"one_time_keys": query_content},
timeout=timeout,
)
async def claim_client_keys_unstable(
self, destination: str, query_content: JsonDict, timeout: Optional[int]
) -> JsonDict:
"""Claim one-time keys for a list of devices hosted on a remote server.
Request:
{
"one_time_keys": {
"<user_id>": {
"<device_id>": {"<algorithm>": <count>}
}
}
}
Response:
{
"one_time_keys": {
"<user_id>": {
"<device_id>": {
"<algorithm>:<key_id>": <OTK JSON>
}
}
}
}
Args:
destination: The server to query.
query_content: The user ids to query.
Returns:
A dict containing the one-time keys.
"""
path = _create_path(FEDERATION_UNSTABLE_PREFIX, "/user/keys/claim")
return await self.client.post_json(
destination=destination,
path=path,
data={"one_time_keys": query_content},
timeout=timeout,
)
async def get_missing_events(
self,
destination: str,
room_id: str,
earliest_events: Iterable[str],
latest_events: Iterable[str],
limit: int,
min_depth: int,
timeout: int,
) -> JsonDict:
path = _create_v1_path("/get_missing_events/%s", room_id)
return await self.client.post_json(
destination=destination,
path=path,
data={
"limit": int(limit),
"min_depth": int(min_depth),
"earliest_events": earliest_events,
"latest_events": latest_events,
},
timeout=timeout,
)
async def get_room_complexity(self, destination: str, room_id: str) -> JsonDict:
"""
Args:
destination: The remote server
room_id: The room ID to ask about.
"""
path = _create_path(FEDERATION_UNSTABLE_PREFIX, "/rooms/%s/complexity", room_id)
return await self.client.get_json(destination=destination, path=path)
async def get_room_hierarchy(
self, destination: str, room_id: str, suggested_only: bool
) -> JsonDict:
"""
Args:
destination: The remote server
room_id: The room ID to ask about.
suggested_only: if True, only suggested rooms will be returned
"""
path = _create_v1_path("/hierarchy/%s", room_id)
return await self.client.get_json(
destination=destination,
path=path,
args={"suggested_only": "true" if suggested_only else "false"},
)
async def get_room_hierarchy_unstable(
self, destination: str, room_id: str, suggested_only: bool
) -> JsonDict:
"""
Args:
destination: The remote server
room_id: The room ID to ask about.
suggested_only: if True, only suggested rooms will be returned
"""
path = _create_path(
FEDERATION_UNSTABLE_PREFIX, "/org.matrix.msc2946/hierarchy/%s", room_id
)
return await self.client.get_json(
destination=destination,
path=path,
args={"suggested_only": "true" if suggested_only else "false"},
)
async def get_account_status(
self, destination: str, user_ids: List[str]
) -> JsonDict:
"""
Args:
destination: The remote server.
user_ids: The user ID(s) for which to request account status(es).
"""
path = _create_path(
FEDERATION_UNSTABLE_PREFIX, "/org.matrix.msc3720/account_status"
)
return await self.client.post_json(
destination=destination, path=path, data={"user_ids": user_ids}
)
def _create_path(federation_prefix: str, path: str, *args: str) -> str:
"""
Ensures that all args are url encoded.
"""
return federation_prefix + path % tuple(urllib.parse.quote(arg, "") for arg in args)
def _create_v1_path(path: str, *args: str) -> str:
"""Creates a path against V1 federation API from the path template and
args. Ensures that all args are url encoded.
Example:
_create_v1_path("/event/%s", event_id)
Args:
path: String template for the path
args: Args to insert into path. Each arg will be url encoded
"""
return _create_path(FEDERATION_V1_PREFIX, path, *args)
def _create_v2_path(path: str, *args: str) -> str:
"""Creates a path against V2 federation API from the path template and
args. Ensures that all args are url encoded.
Example:
_create_v2_path("/event/%s", event_id)
Args:
path: String template for the path
args: Args to insert into path. Each arg will be url encoded
"""
return _create_path(FEDERATION_V2_PREFIX, path, *args)
@attr.s(slots=True, auto_attribs=True)
class SendJoinResponse:
"""The parsed response of a `/send_join` request."""
# The list of auth events from the /send_join response.
auth_events: List[EventBase]
# The list of state from the /send_join response.
state: List[EventBase]
# The raw join event from the /send_join response.
event_dict: JsonDict
# The parsed join event from the /send_join response. This will be None if
# "event" is not included in the response.
event: Optional[EventBase] = None
# The room state is incomplete
members_omitted: bool = False
# List of servers in the room
servers_in_room: Optional[List[str]] = None
@attr.s(slots=True, auto_attribs=True)
class StateRequestResponse:
"""The parsed response of a `/state` request."""
auth_events: List[EventBase]
state: List[EventBase]
@ijson.coroutine
def _event_parser(event_dict: JsonDict) -> Generator[None, Tuple[str, Any], None]:
"""Helper function for use with `ijson.kvitems_coro` to parse key-value pairs
to add them to a given dictionary.
"""
while True:
key, value = yield
event_dict[key] = value
@ijson.coroutine
def _event_list_parser(
room_version: RoomVersion, events: List[EventBase]
) -> Generator[None, JsonDict, None]:
"""Helper function for use with `ijson.items_coro` to parse an array of
events and add them to the given list.
"""
while True:
obj = yield
event = make_event_from_dict(obj, room_version)
events.append(event)
@ijson.coroutine
def _members_omitted_parser(response: SendJoinResponse) -> Generator[None, Any, None]:
"""Helper function for use with `ijson.items_coro`
Parses the members_omitted field in send_join responses
"""
while True:
val = yield
if not isinstance(val, bool):
raise TypeError(
"members_omitted (formerly org.matrix.msc370c.partial_state) must be a boolean"
)
response.members_omitted = val
@ijson.coroutine
def _servers_in_room_parser(response: SendJoinResponse) -> Generator[None, Any, None]:
"""Helper function for use with `ijson.items_coro`
Parses the servers_in_room field in send_join responses
"""
while True:
val = yield
if not isinstance(val, list) or any(not isinstance(x, str) for x in val):
raise TypeError("servers_in_room must be a list of strings")
response.servers_in_room = val
class SendJoinParser(ByteParser[SendJoinResponse]):
"""A parser for the response to `/send_join` requests.
Args:
room_version: The version of the room.
v1_api: Whether the response is in the v1 format.
"""
CONTENT_TYPE = "application/json"
# /send_join responses can be huge, so we override the size limit here. The response
# is parsed in a streaming manner, which helps alleviate the issue of memory
# usage a bit.
MAX_RESPONSE_SIZE = 500 * 1024 * 1024
def __init__(self, room_version: RoomVersion, v1_api: bool):
self._response = SendJoinResponse([], [], event_dict={})
self._room_version = room_version
self._coros: List[Generator[None, bytes, None]] = []
# The V1 API has the shape of `[200, {...}]`, which we handle by
# prefixing with `item.*`.
prefix = "item." if v1_api else ""
self._coros = [
ijson.items_coro(
_event_list_parser(room_version, self._response.state),
prefix + "state.item",
use_float=True,
),
ijson.items_coro(
_event_list_parser(room_version, self._response.auth_events),
prefix + "auth_chain.item",
use_float=True,
),
ijson.kvitems_coro(
_event_parser(self._response.event_dict),
prefix + "event",
use_float=True,
),
]
if not v1_api:
self._coros.append(
ijson.items_coro(
_members_omitted_parser(self._response),
"org.matrix.msc3706.partial_state",
use_float="True",
)
)
# The stable field name comes last, so it "wins" if the fields disagree
self._coros.append(
ijson.items_coro(
_members_omitted_parser(self._response),
"members_omitted",
use_float="True",
)
)
self._coros.append(
ijson.items_coro(
_servers_in_room_parser(self._response),
"org.matrix.msc3706.servers_in_room",
use_float="True",
)
)
# Again, stable field name comes last
self._coros.append(
ijson.items_coro(
_servers_in_room_parser(self._response),
"servers_in_room",
use_float="True",
)
)
def write(self, data: bytes) -> int:
for c in self._coros:
c.send(data)
return len(data)
def finish(self) -> SendJoinResponse:
_close_coros(self._coros)
if self._response.event_dict:
self._response.event = make_event_from_dict(
self._response.event_dict, self._room_version
)
return self._response
class _StateParser(ByteParser[StateRequestResponse]):
"""A parser for the response to `/state` requests.
Args:
room_version: The version of the room.
"""
CONTENT_TYPE = "application/json"
# As with /send_join, /state responses can be huge.
MAX_RESPONSE_SIZE = 500 * 1024 * 1024
def __init__(self, room_version: RoomVersion):
self._response = StateRequestResponse([], [])
self._room_version = room_version
self._coros: List[Generator[None, bytes, None]] = [
ijson.items_coro(
_event_list_parser(room_version, self._response.state),
"pdus.item",
use_float=True,
),
ijson.items_coro(
_event_list_parser(room_version, self._response.auth_events),
"auth_chain.item",
use_float=True,
),
]
def write(self, data: bytes) -> int:
for c in self._coros:
c.send(data)
return len(data)
def finish(self) -> StateRequestResponse:
_close_coros(self._coros)
return self._response
def _close_coros(coros: Iterable[Generator[None, bytes, None]]) -> None:
"""Close each of the given coroutines.
Always calls .close() on each coroutine, even if doing so raises an exception.
Any exceptions raised are aggregated into an ExceptionBundle.
:raises ExceptionBundle: if at least one coroutine fails to close.
"""
exceptions = []
for c in coros:
try:
c.close()
except Exception as e:
exceptions.append(e)
if exceptions:
# raise from the first exception so that the traceback has slightly more context
raise ExceptionBundle(
f"There were {len(exceptions)} errors closing coroutines", exceptions
) from exceptions[0]
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