diff --git a/synapse/federation/transport/client.py b/synapse/federation/transport/client.py
new file mode 100644
index 0000000000..8b137e7128
--- /dev/null
+++ b/synapse/federation/transport/client.py
@@ -0,0 +1,221 @@
+# -*- coding: utf-8 -*-
+# Copyright 2014, 2015 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.
+
+from twisted.internet import defer
+
+from synapse.api.urls import FEDERATION_PREFIX as PREFIX
+from synapse.util.logutils import log_function
+
+import logging
+
+
+logger = logging.getLogger(__name__)
+
+
+class TransportLayerClient(object):
+ """Sends federation HTTP requests to other servers"""
+
+ @log_function
+ def get_room_state(self, destination, room_id, event_id):
+ """ Requests all state for a given room from the given server at the
+ given event.
+
+ Args:
+ destination (str): The host name of the remote home server we want
+ to get the state from.
+ context (str): The name of the context we want the state of
+ event_id (str): The event we want the context at.
+
+ Returns:
+ Deferred: Results in a dict received from the remote homeserver.
+ """
+ logger.debug("get_room_state dest=%s, room=%s",
+ destination, room_id)
+
+ path = PREFIX + "/state/%s/" % room_id
+ return self.client.get_json(
+ destination, path=path, args={"event_id": event_id},
+ )
+
+ @log_function
+ def get_event(self, destination, event_id):
+ """ Requests the pdu with give id and origin from the given server.
+
+ Args:
+ destination (str): The host name of the remote home server we want
+ to get the state from.
+ event_id (str): The id of the event being requested.
+
+ Returns:
+ Deferred: Results in a dict received from the remote homeserver.
+ """
+ logger.debug("get_pdu dest=%s, event_id=%s",
+ destination, event_id)
+
+ path = PREFIX + "/event/%s/" % (event_id, )
+ return self.client.get_json(destination, path=path)
+
+ @log_function
+ def backfill(self, destination, room_id, event_tuples, limit):
+ """ Requests `limit` previous PDUs in a given context before list of
+ PDUs.
+
+ Args:
+ dest (str)
+ room_id (str)
+ event_tuples (list)
+ limt (int)
+
+ Returns:
+ Deferred: Results in a dict received from the remote homeserver.
+ """
+ logger.debug(
+ "backfill dest=%s, room_id=%s, event_tuples=%s, limit=%s",
+ destination, room_id, repr(event_tuples), str(limit)
+ )
+
+ if not event_tuples:
+ # TODO: raise?
+ return
+
+ path = PREFIX + "/backfill/%s/" % (room_id,)
+
+ args = {
+ "v": event_tuples,
+ "limit": [str(limit)],
+ }
+
+ return self.client.get_json(
+ destination,
+ path=path,
+ args=args,
+ )
+
+ @defer.inlineCallbacks
+ @log_function
+ def send_transaction(self, transaction, json_data_callback=None):
+ """ Sends the given Transaction to its destination
+
+ Args:
+ transaction (Transaction)
+
+ Returns:
+ Deferred: Results of the deferred is a tuple in the form of
+ (response_code, response_body) where the response_body is a
+ python dict decoded from json
+ """
+ logger.debug(
+ "send_data dest=%s, txid=%s",
+ transaction.destination, transaction.transaction_id
+ )
+
+ if transaction.destination == self.server_name:
+ 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()
+
+ response = yield self.client.put_json(
+ transaction.destination,
+ path=PREFIX + "/send/%s/" % transaction.transaction_id,
+ data=json_data,
+ json_data_callback=json_data_callback,
+ )
+
+ logger.debug(
+ "send_data dest=%s, txid=%s, got response: 200",
+ transaction.destination, transaction.transaction_id,
+ )
+
+ defer.returnValue(response)
+
+ @defer.inlineCallbacks
+ @log_function
+ def make_query(self, destination, query_type, args, retry_on_dns_fail):
+ path = PREFIX + "/query/%s" % query_type
+
+ content = yield self.client.get_json(
+ destination=destination,
+ path=path,
+ args=args,
+ retry_on_dns_fail=retry_on_dns_fail,
+ )
+
+ defer.returnValue(content)
+
+ @defer.inlineCallbacks
+ @log_function
+ def make_join(self, destination, room_id, user_id, retry_on_dns_fail=True):
+ path = PREFIX + "/make_join/%s/%s" % (room_id, user_id)
+
+ content = yield self.client.get_json(
+ destination=destination,
+ path=path,
+ retry_on_dns_fail=retry_on_dns_fail,
+ )
+
+ defer.returnValue(content)
+
+ @defer.inlineCallbacks
+ @log_function
+ def send_join(self, destination, room_id, event_id, content):
+ path = PREFIX + "/send_join/%s/%s" % (room_id, event_id)
+
+ response = yield self.client.put_json(
+ destination=destination,
+ path=path,
+ data=content,
+ )
+
+ defer.returnValue(response)
+
+ @defer.inlineCallbacks
+ @log_function
+ def send_invite(self, destination, room_id, event_id, content):
+ path = PREFIX + "/invite/%s/%s" % (room_id, event_id)
+
+ response = yield self.client.put_json(
+ destination=destination,
+ path=path,
+ data=content,
+ )
+
+ defer.returnValue(response)
+
+ @defer.inlineCallbacks
+ @log_function
+ def get_event_auth(self, destination, room_id, event_id):
+ path = PREFIX + "/event_auth/%s/%s" % (room_id, event_id)
+
+ content = yield self.client.get_json(
+ destination=destination,
+ path=path,
+ )
+
+ defer.returnValue(content)
+
+ @defer.inlineCallbacks
+ @log_function
+ def send_query_auth(self, destination, room_id, event_id, content):
+ path = PREFIX + "/query_auth/%s/%s" % (room_id, event_id)
+
+ content = yield self.client.post_json(
+ destination=destination,
+ path=path,
+ data=content,
+ )
+
+ defer.returnValue(content)
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