mirror of
https://git.anonymousland.org/anonymousland/synapse.git
synced 2024-09-06 19:02:07 +00:00
Merge pull request #1624 from matrix-org/kegan/idempotent-requests
Store Promise<Response> instead of Response for HTTP API transactions
This commit is contained in:
commit
9355a5c42b
98
synapse/rest/client/transactions.py
Normal file
98
synapse/rest/client/transactions.py
Normal file
@ -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]
|
@ -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())
|
||||
|
@ -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):
|
||||
|
@ -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
|
@ -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)
|
||||
|
||||
|
||||
|
@ -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
|
||||
|
69
tests/rest/client/test_transactions.py
Normal file
69
tests/rest/client/test_transactions.py
Normal file
@ -0,0 +1,69 @@
|
||||
from synapse.rest.client.transactions import HttpTransactionCache
|
||||
from synapse.rest.client.transactions import CLEANUP_PERIOD_MS
|
||||
from twisted.internet import defer
|
||||
from mock import Mock, call
|
||||
from tests import unittest
|
||||
from tests.utils import MockClock
|
||||
|
||||
|
||||
class HttpTransactionCacheTestCase(unittest.TestCase):
|
||||
|
||||
def setUp(self):
|
||||
self.clock = MockClock()
|
||||
self.cache = HttpTransactionCache(self.clock)
|
||||
|
||||
self.mock_http_response = (200, "GOOD JOB!")
|
||||
self.mock_key = "foo"
|
||||
|
||||
@defer.inlineCallbacks
|
||||
def test_executes_given_function(self):
|
||||
cb = Mock(
|
||||
return_value=defer.succeed(self.mock_http_response)
|
||||
)
|
||||
res = yield self.cache.fetch_or_execute(
|
||||
self.mock_key, cb, "some_arg", keyword="arg"
|
||||
)
|
||||
cb.assert_called_once_with("some_arg", keyword="arg")
|
||||
self.assertEqual(res, self.mock_http_response)
|
||||
|
||||
@defer.inlineCallbacks
|
||||
def test_deduplicates_based_on_key(self):
|
||||
cb = Mock(
|
||||
return_value=defer.succeed(self.mock_http_response)
|
||||
)
|
||||
for i in range(3): # invoke multiple times
|
||||
res = yield self.cache.fetch_or_execute(
|
||||
self.mock_key, cb, "some_arg", keyword="arg", changing_args=i
|
||||
)
|
||||
self.assertEqual(res, self.mock_http_response)
|
||||
# expect only a single call to do the work
|
||||
cb.assert_called_once_with("some_arg", keyword="arg", changing_args=0)
|
||||
|
||||
@defer.inlineCallbacks
|
||||
def test_cleans_up(self):
|
||||
cb = Mock(
|
||||
return_value=defer.succeed(self.mock_http_response)
|
||||
)
|
||||
yield self.cache.fetch_or_execute(
|
||||
self.mock_key, cb, "an arg"
|
||||
)
|
||||
# should NOT have cleaned up yet
|
||||
self.clock.advance_time_msec(CLEANUP_PERIOD_MS / 2)
|
||||
|
||||
yield self.cache.fetch_or_execute(
|
||||
self.mock_key, cb, "an arg"
|
||||
)
|
||||
# still using cache
|
||||
cb.assert_called_once_with("an arg")
|
||||
|
||||
self.clock.advance_time_msec(CLEANUP_PERIOD_MS)
|
||||
|
||||
yield self.cache.fetch_or_execute(
|
||||
self.mock_key, cb, "an arg"
|
||||
)
|
||||
# no longer using cache
|
||||
self.assertEqual(cb.call_count, 2)
|
||||
self.assertEqual(
|
||||
cb.call_args_list,
|
||||
[call("an arg",), call("an arg",)]
|
||||
)
|
Loading…
Reference in New Issue
Block a user