diff --git a/synapse/rest/transactions.py b/synapse/rest/transactions.py
deleted file mode 100644
index d933fea18a..0000000000
--- a/synapse/rest/transactions.py
+++ /dev/null
@@ -1,95 +0,0 @@
-# -*- 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.
-
-"""This module contains logic for storing HTTP PUT transactions. This is used
-to ensure idempotency when performing PUTs using the REST API."""
-import logging
-
-logger = logging.getLogger(__name__)
-
-
-# FIXME: elsewhere we use FooStore to indicate something in the storage layer...
-class HttpTransactionStore(object):
-
- def __init__(self):
- # { key : (txn_id, response) }
- self.transactions = {}
-
- def get_response(self, key, txn_id):
- """Retrieve a response for this request.
-
- Args:
- key (str): A transaction-independent key for this request. Usually
- this is a combination of the path (without the transaction id)
- and the user's access token.
- txn_id (str): The transaction ID for this request
- Returns:
- A tuple of (HTTP response code, response content) or None.
- """
- try:
- logger.debug("get_response Key: %s TxnId: %s", key, txn_id)
- (last_txn_id, response) = self.transactions[key]
- if txn_id == last_txn_id:
- logger.info("get_response: Returning a response for %s", key)
- return response
- except KeyError:
- pass
- return None
-
- def store_response(self, key, txn_id, response):
- """Stores an HTTP response tuple.
-
- Args:
- key (str): A transaction-independent key for this request. Usually
- this is a combination of the path (without the transaction id)
- and the user's access token.
- txn_id (str): The transaction ID for this request.
- response (tuple): A tuple of (HTTP response code, response content)
- """
- logger.debug("store_response Key: %s TxnId: %s", key, txn_id)
- self.transactions[key] = (txn_id, response)
-
- def store_client_transaction(self, request, txn_id, response):
- """Stores the request/response pair of an HTTP transaction.
-
- Args:
- request (twisted.web.http.Request): The twisted HTTP request. This
- request must have the transaction ID as the last path segment.
- response (tuple): A tuple of (response code, response dict)
- txn_id (str): The transaction ID for this request.
- """
- self.store_response(self._get_key(request), txn_id, response)
-
- def get_client_transaction(self, request, txn_id):
- """Retrieves a stored response if there was one.
-
- Args:
- request (twisted.web.http.Request): The twisted HTTP request. This
- request must have the transaction ID as the last path segment.
- txn_id (str): The transaction ID for this request.
- Returns:
- The response tuple.
- Raises:
- KeyError if the transaction was not found.
- """
- response = self.get_response(self._get_key(request), txn_id)
- if response is None:
- raise KeyError("Transaction not found.")
- return response
-
- def _get_key(self, request):
- token = request.args["access_token"][0]
- path_without_txn_id = request.path.rsplit("/", 1)[0]
- return path_without_txn_id + "/" + token
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