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# 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.
"""This module contains REST servlets to do with event streaming, /events."""
import logging
from typing import TYPE_CHECKING, Dict, List, Tuple, Union
from synapse.api.errors import SynapseError
from synapse.events.utils import SerializeEventConfig
from synapse.http.server import HttpServer
from synapse.http.servlet import RestServlet, parse_string
from synapse.http.site import SynapseRequest
from synapse.rest.client._base import client_patterns
from synapse.streams.config import PaginationConfig
from synapse.types import JsonDict
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
class EventStreamRestServlet(RestServlet):
PATTERNS = client_patterns("/events$", v1=True)
DEFAULT_LONGPOLL_TIME_MS = 30000
def __init__(self, hs: "HomeServer"):
super().__init__()
self.event_stream_handler = hs.get_event_stream_handler()
self.auth = hs.get_auth()
self.store = hs.get_datastores().main
async def on_GET(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
requester = await self.auth.get_user_by_req(request, allow_guest=True)
args: Dict[bytes, List[bytes]] = request.args # type: ignore
if requester.is_guest:
if b"room_id" not in args:
raise SynapseError(400, "Guest users must specify room_id param")
room_id = parse_string(request, "room_id")
pagin_config = await PaginationConfig.from_request(
self.store, request, default_limit=10
)
timeout = EventStreamRestServlet.DEFAULT_LONGPOLL_TIME_MS
if b"timeout" in args:
try:
timeout = int(args[b"timeout"][0])
except ValueError:
raise SynapseError(400, "timeout must be in milliseconds.")
as_client_event = b"raw" not in args
chunk = await self.event_stream_handler.get_stream(
requester,
pagin_config,
timeout=timeout,
as_client_event=as_client_event,
affect_presence=(not requester.is_guest),
room_id=room_id,
)
return 200, chunk
class EventRestServlet(RestServlet):
PATTERNS = client_patterns("/events/(?P<event_id>[^/]*)$", v1=True)
def __init__(self, hs: "HomeServer"):
super().__init__()
self.clock = hs.get_clock()
self.event_handler = hs.get_event_handler()
self.auth = hs.get_auth()
self._event_serializer = hs.get_event_client_serializer()
async def on_GET(
self, request: SynapseRequest, event_id: str
) -> Tuple[int, Union[str, JsonDict]]:
requester = await self.auth.get_user_by_req(request)
event = await self.event_handler.get_event(requester.user, None, event_id)
if event:
result = self._event_serializer.serialize_event(
event,
self.clock.time_msec(),
config=SerializeEventConfig(requester=requester),
)
return 200, result
else:
return 404, "Event not found."
def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
EventStreamRestServlet(hs).register(http_server)
EventRestServlet(hs).register(http_server)
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