anonymousland-synapse/synapse/handlers/e2e_keys.py
Mark Haines 949c2c5435 Add a timeout parameter for end2end key queries.
Add a timeout parameter for controlling how long synapse will wait
for responses from remote servers. For servers that fail include how
they failed to make it easier to debug.

Fetch keys from different servers in parallel rather than in series.

Set the default timeout to 10s.
2016-09-12 18:17:09 +01:00

162 lines
5.6 KiB
Python

# -*- coding: utf-8 -*-
# Copyright 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 json
import logging
from twisted.internet import defer
from synapse.api.errors import SynapseError, CodeMessageException
from synapse.types import get_domain_from_id
from synapse.util.logcontext import preserve_fn, preserve_context_over_deferred
logger = logging.getLogger(__name__)
class E2eKeysHandler(object):
def __init__(self, hs):
self.store = hs.get_datastore()
self.federation = hs.get_replication_layer()
self.is_mine_id = hs.is_mine_id
# doesn't really work as part of the generic query API, because the
# query request requires an object POST, but we abuse the
# "query handler" interface.
self.federation.register_query_handler(
"client_keys", self.on_federation_query_client_keys
)
@defer.inlineCallbacks
def query_devices(self, query_body, timeout):
""" Handle a device key query from a client
{
"device_keys": {
"<user_id>": ["<device_id>"]
}
}
->
{
"device_keys": {
"<user_id>": {
"<device_id>": {
...
}
}
}
}
"""
device_keys_query = query_body.get("device_keys", {})
# separate users by domain.
# make a map from domain to user_id to device_ids
local_query = {}
remote_queries = {}
for user_id, device_ids in device_keys_query.items():
if self.is_mine_id(user_id):
local_query[user_id] = device_ids
else:
domain = get_domain_from_id(user_id)
remote_queries.setdefault(domain, {})[user_id] = device_ids
# do the queries
failures = {}
results = {}
if local_query:
local_result = yield self.query_local_devices(local_query)
for user_id, keys in local_result.items():
if user_id in local_query:
results[user_id] = keys
@defer.inlineCallbacks
def do_remote_query(destination):
destination_query = remote_queries[destination]
try:
remote_result = yield self.federation.query_client_keys(
destination,
{"device_keys": destination_query},
timeout=timeout
)
for user_id, keys in remote_result["device_keys"].items():
if user_id in destination_query:
results[user_id] = keys
except CodeMessageException as e:
failures[destination] = {
"status": e.code, "message": e.message
}
yield preserve_context_over_deferred(defer.gatherResults([
preserve_fn(do_remote_query)(destination)
for destination in remote_queries
]))
defer.returnValue((200, {
"device_keys": results, "failures": failures,
}))
@defer.inlineCallbacks
def query_local_devices(self, query):
"""Get E2E device keys for local users
Args:
query (dict[string, list[string]|None): map from user_id to a list
of devices to query (None for all devices)
Returns:
defer.Deferred: (resolves to dict[string, dict[string, dict]]):
map from user_id -> device_id -> device details
"""
local_query = []
result_dict = {}
for user_id, device_ids in query.items():
if not self.is_mine_id(user_id):
logger.warning("Request for keys for non-local user %s",
user_id)
raise SynapseError(400, "Not a user here")
if not device_ids:
local_query.append((user_id, None))
else:
for device_id in device_ids:
local_query.append((user_id, device_id))
# make sure that each queried user appears in the result dict
result_dict[user_id] = {}
results = yield self.store.get_e2e_device_keys(local_query)
# Build the result structure, un-jsonify the results, and add the
# "unsigned" section
for user_id, device_keys in results.items():
for device_id, device_info in device_keys.items():
r = json.loads(device_info["key_json"])
r["unsigned"] = {}
display_name = device_info["device_display_name"]
if display_name is not None:
r["unsigned"]["device_display_name"] = display_name
result_dict[user_id][device_id] = r
defer.returnValue(result_dict)
@defer.inlineCallbacks
def on_federation_query_client_keys(self, query_body):
""" Handle a device key query from a federated server
"""
device_keys_query = query_body.get("device_keys", {})
res = yield self.query_local_devices(device_keys_query)
defer.returnValue({"device_keys": res})