diff options
Diffstat (limited to 'synapse')
| -rw-r--r-- | synapse/rest/client/transactions.py | 98 | ||||
| -rw-r--r-- | synapse/rest/client/v1/base.py | 5 | ||||
| -rw-r--r-- | synapse/rest/client/v1/room.py | 90 | ||||
| -rw-r--r-- | synapse/rest/client/v1/transactions.py | 97 | ||||
| -rw-r--r-- | synapse/rest/client/v2_alpha/sendtodevice.py | 17 | ||||
| -rw-r--r-- | synapse/util/__init__.py | 10 |
6 files changed, 133 insertions, 184 deletions
diff --git a/synapse/rest/client/transactions.py b/synapse/rest/client/transactions.py new file mode 100644 index 0000000000..351170edbc --- /dev/null +++ b/synapse/rest/client/transactions.py @@ -0,0 +1,98 @@ +# -*- coding: utf-8 -*- +# 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 logic for storing HTTP PUT transactions. This is used +to ensure idempotency when performing PUTs using the REST API.""" +import logging + +from synapse.api.auth import get_access_token_from_request +from synapse.util.async import ObservableDeferred + +logger = logging.getLogger(__name__) + + +def get_transaction_key(request): + """A helper function which returns a transaction key that can be used + with TransactionCache for idempotent requests. + + Idempotency is based on the returned key being the same for separate + requests to the same endpoint. The key is formed from the HTTP request + path and the access_token for the requesting user. + + Args: + request (twisted.web.http.Request): The incoming request. Must + contain an access_token. + Returns: + str: A transaction key + """ + token = get_access_token_from_request(request) + return request.path + "/" + token + + +CLEANUP_PERIOD_MS = 1000 * 60 * 30 # 30 mins + + +class HttpTransactionCache(object): + + def __init__(self, clock): + self.clock = clock + self.transactions = { + # $txn_key: (ObservableDeferred<(res_code, res_json_body)>, timestamp) + } + # Try to clean entries every 30 mins. This means entries will exist + # for at *LEAST* 30 mins, and at *MOST* 60 mins. + self.cleaner = self.clock.looping_call(self._cleanup, CLEANUP_PERIOD_MS) + + def fetch_or_execute_request(self, request, fn, *args, **kwargs): + """A helper function for fetch_or_execute which extracts + a transaction key from the given request. + + See: + fetch_or_execute + """ + return self.fetch_or_execute( + get_transaction_key(request), fn, *args, **kwargs + ) + + def fetch_or_execute(self, txn_key, fn, *args, **kwargs): + """Fetches the response for this transaction, or executes the given function + to produce a response for this transaction. + + Args: + txn_key (str): A key to ensure idempotency should fetch_or_execute be + called again at a later point in time. + fn (function): A function which returns a tuple of + (response_code, response_dict). + *args: Arguments to pass to fn. + **kwargs: Keyword arguments to pass to fn. + Returns: + Deferred which resolves to a tuple of (response_code, response_dict). + """ + try: + return self.transactions[txn_key][0].observe() + except (KeyError, IndexError): + pass # execute the function instead. + + deferred = fn(*args, **kwargs) + observable = ObservableDeferred(deferred) + self.transactions[txn_key] = (observable, self.clock.time_msec()) + return observable.observe() + + def _cleanup(self): + now = self.clock.time_msec() + for key in self.transactions.keys(): + ts = self.transactions[key][1] + if now > (ts + CLEANUP_PERIOD_MS): # after cleanup period + del self.transactions[key] diff --git a/synapse/rest/client/v1/base.py b/synapse/rest/client/v1/base.py index c2a8447860..c7aa0bbf59 100644 --- a/synapse/rest/client/v1/base.py +++ b/synapse/rest/client/v1/base.py @@ -18,7 +18,8 @@ from synapse.http.servlet import RestServlet from synapse.api.urls import CLIENT_PREFIX -from .transactions import HttpTransactionStore +from synapse.rest.client.transactions import HttpTransactionCache + import re import logging @@ -59,4 +60,4 @@ class ClientV1RestServlet(RestServlet): self.hs = hs self.builder_factory = hs.get_event_builder_factory() self.auth = hs.get_v1auth() - self.txns = HttpTransactionStore() + self.txns = HttpTransactionCache(hs.get_clock()) diff --git a/synapse/rest/client/v1/room.py b/synapse/rest/client/v1/room.py index 010fbc7c32..3fb1f2deb3 100644 --- a/synapse/rest/client/v1/room.py +++ b/synapse/rest/client/v1/room.py @@ -53,19 +53,10 @@ class RoomCreateRestServlet(ClientV1RestServlet): client_path_patterns("/createRoom(?:/.*)?$"), self.on_OPTIONS) - @defer.inlineCallbacks def on_PUT(self, request, txn_id): - try: - defer.returnValue( - self.txns.get_client_transaction(request, txn_id) - ) - except KeyError: - pass - - response = yield self.on_POST(request) - - self.txns.store_client_transaction(request, txn_id, response) - defer.returnValue(response) + return self.txns.fetch_or_execute_request( + request, self.on_POST, request + ) @defer.inlineCallbacks def on_POST(self, request): @@ -214,19 +205,10 @@ class RoomSendEventRestServlet(ClientV1RestServlet): def on_GET(self, request, room_id, event_type, txn_id): return (200, "Not implemented") - @defer.inlineCallbacks def on_PUT(self, request, room_id, event_type, txn_id): - try: - defer.returnValue( - self.txns.get_client_transaction(request, txn_id) - ) - except KeyError: - pass - - response = yield self.on_POST(request, room_id, event_type, txn_id) - - self.txns.store_client_transaction(request, txn_id, response) - defer.returnValue(response) + return self.txns.fetch_or_execute_request( + request, self.on_POST, request, room_id, event_type, txn_id + ) # TODO: Needs unit testing for room ID + alias joins @@ -283,19 +265,10 @@ class JoinRoomAliasServlet(ClientV1RestServlet): defer.returnValue((200, {"room_id": room_id})) - @defer.inlineCallbacks def on_PUT(self, request, room_identifier, txn_id): - try: - defer.returnValue( - self.txns.get_client_transaction(request, txn_id) - ) - except KeyError: - pass - - response = yield self.on_POST(request, room_identifier, txn_id) - - self.txns.store_client_transaction(request, txn_id, response) - defer.returnValue(response) + return self.txns.fetch_or_execute_request( + request, self.on_POST, request, room_identifier, txn_id + ) # TODO: Needs unit testing @@ -537,22 +510,11 @@ class RoomForgetRestServlet(ClientV1RestServlet): defer.returnValue((200, {})) - @defer.inlineCallbacks def on_PUT(self, request, room_id, txn_id): - try: - defer.returnValue( - self.txns.get_client_transaction(request, txn_id) - ) - except KeyError: - pass - - response = yield self.on_POST( - request, room_id, txn_id + return self.txns.fetch_or_execute_request( + request, self.on_POST, request, room_id, txn_id ) - self.txns.store_client_transaction(request, txn_id, response) - defer.returnValue(response) - # TODO: Needs unit testing class RoomMembershipRestServlet(ClientV1RestServlet): @@ -623,22 +585,11 @@ class RoomMembershipRestServlet(ClientV1RestServlet): return False return True - @defer.inlineCallbacks def on_PUT(self, request, room_id, membership_action, txn_id): - try: - defer.returnValue( - self.txns.get_client_transaction(request, txn_id) - ) - except KeyError: - pass - - response = yield self.on_POST( - request, room_id, membership_action, txn_id + return self.txns.fetch_or_execute_request( + request, self.on_POST, request, room_id, membership_action, txn_id ) - self.txns.store_client_transaction(request, txn_id, response) - defer.returnValue(response) - class RoomRedactEventRestServlet(ClientV1RestServlet): def __init__(self, hs): @@ -669,19 +620,10 @@ class RoomRedactEventRestServlet(ClientV1RestServlet): defer.returnValue((200, {"event_id": event.event_id})) - @defer.inlineCallbacks def on_PUT(self, request, room_id, event_id, txn_id): - try: - defer.returnValue( - self.txns.get_client_transaction(request, txn_id) - ) - except KeyError: - pass - - response = yield self.on_POST(request, room_id, event_id, txn_id) - - self.txns.store_client_transaction(request, txn_id, response) - defer.returnValue(response) + return self.txns.fetch_or_execute_request( + request, self.on_POST, request, room_id, event_id, txn_id + ) class RoomTypingRestServlet(ClientV1RestServlet): diff --git a/synapse/rest/client/v1/transactions.py b/synapse/rest/client/v1/transactions.py deleted file mode 100644 index 2f2c9d0881..0000000000 --- a/synapse/rest/client/v1/transactions.py +++ /dev/null @@ -1,97 +0,0 @@ -# -*- coding: utf-8 -*- -# 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 logic for storing HTTP PUT transactions. This is used -to ensure idempotency when performing PUTs using the REST API.""" -import logging - -from synapse.api.auth import get_access_token_from_request - -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 TxnId: %s", txn_id) - (last_txn_id, response) = self.transactions[key] - if txn_id == last_txn_id: - logger.info("get_response: Returning a response for %s", txn_id) - 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 TxnId: %s", 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 = get_access_token_from_request(request) - path_without_txn_id = request.path.rsplit("/", 1)[0] - return path_without_txn_id + "/" + token diff --git a/synapse/rest/client/v2_alpha/sendtodevice.py b/synapse/rest/client/v2_alpha/sendtodevice.py index 5975164b37..ac660669f3 100644 --- a/synapse/rest/client/v2_alpha/sendtodevice.py +++ b/synapse/rest/client/v2_alpha/sendtodevice.py @@ -19,7 +19,7 @@ from twisted.internet import defer from synapse.http import servlet from synapse.http.servlet import parse_json_object_from_request -from synapse.rest.client.v1.transactions import HttpTransactionStore +from synapse.rest.client.transactions import HttpTransactionCache from ._base import client_v2_patterns @@ -40,18 +40,16 @@ class SendToDeviceRestServlet(servlet.RestServlet): super(SendToDeviceRestServlet, self).__init__() self.hs = hs self.auth = hs.get_auth() - self.txns = HttpTransactionStore() + self.txns = HttpTransactionCache(hs.get_clock()) self.device_message_handler = hs.get_device_message_handler() - @defer.inlineCallbacks def on_PUT(self, request, message_type, txn_id): - try: - defer.returnValue( - self.txns.get_client_transaction(request, txn_id) - ) - except KeyError: - pass + return self.txns.fetch_or_execute_request( + request, self._put, request, message_type, txn_id + ) + @defer.inlineCallbacks + def _put(self, request, message_type, txn_id): requester = yield self.auth.get_user_by_req(request) content = parse_json_object_from_request(request) @@ -63,7 +61,6 @@ class SendToDeviceRestServlet(servlet.RestServlet): ) response = (200, {}) - self.txns.store_client_transaction(request, txn_id, response) defer.returnValue(response) diff --git a/synapse/util/__init__.py b/synapse/util/__init__.py index 2b3f0bef3c..c05b9450be 100644 --- a/synapse/util/__init__.py +++ b/synapse/util/__init__.py @@ -34,7 +34,7 @@ class Clock(object): """A small utility that obtains current time-of-day so that time may be mocked during unit-tests. - TODO(paul): Also move the sleep() functionallity into it + TODO(paul): Also move the sleep() functionality into it """ def time(self): @@ -46,6 +46,14 @@ class Clock(object): return int(self.time() * 1000) def looping_call(self, f, msec): + """Call a function repeatedly. + + Waits `msec` initially before calling `f` for the first time. + + Args: + f(function): The function to call repeatedly. + msec(float): How long to wait between calls in milliseconds. + """ l = task.LoopingCall(f) l.start(msec / 1000.0, now=False) return l |