diff options
Diffstat (limited to '')
| -rw-r--r-- | synapse/crypto/keyring.py | 64 | ||||
| -rw-r--r-- | tests/crypto/test_keyring.py | 74 |
2 files changed, 110 insertions, 28 deletions
diff --git a/synapse/crypto/keyring.py b/synapse/crypto/keyring.py index 1bb27edc0f..51851d04e5 100644 --- a/synapse/crypto/keyring.py +++ b/synapse/crypto/keyring.py @@ -1,5 +1,6 @@ # -*- coding: utf-8 -*- # Copyright 2014-2016 OpenMarket Ltd +# Copyright 2017 New Vector Ltd. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. @@ -15,10 +16,9 @@ from synapse.crypto.keyclient import fetch_server_key from synapse.api.errors import SynapseError, Codes -from synapse.util import unwrapFirstError -from synapse.util.async import ObservableDeferred +from synapse.util import unwrapFirstError, logcontext from synapse.util.logcontext import ( - preserve_context_over_deferred, preserve_context_over_fn, PreserveLoggingContext, + preserve_context_over_fn, PreserveLoggingContext, preserve_fn ) from synapse.util.metrics import Measure @@ -74,6 +74,11 @@ class Keyring(object): self.perspective_servers = self.config.perspectives self.hs = hs + # map from server name to Deferred. Has an entry for each server with + # an ongoing key download; the Deferred completes once the download + # completes. + # + # These are regular, logcontext-agnostic Deferreds. self.key_downloads = {} def verify_json_for_server(self, server_name, json_object): @@ -82,7 +87,7 @@ class Keyring(object): )[0] def verify_json_objects_for_server(self, server_and_json): - """Bulk verfies signatures of json objects, bulk fetching keys as + """Bulk verifies signatures of json objects, bulk fetching keys as necessary. Args: @@ -212,7 +217,13 @@ class Keyring(object): Args: server_names (list): list of server_names we want to lookup server_to_deferred (dict): server_name to deferred which gets - resolved once we've finished looking up keys for that server + resolved once we've finished looking up keys for that server. + The Deferreds should be regular twisted ones which call their + callbacks with no logcontext. + + Returns: a Deferred which resolves once all key lookups for the given + servers have completed. Follows the synapse rules of logcontext + preservation. """ while True: wait_on = [ @@ -226,15 +237,13 @@ class Keyring(object): else: break - for server_name, deferred in server_to_deferred.items(): - d = ObservableDeferred(preserve_context_over_deferred(deferred)) - self.key_downloads[server_name] = d - - def rm(r, server_name): - self.key_downloads.pop(server_name, None) - return r + def rm(r, server_name_): + self.key_downloads.pop(server_name_, None) + return r - d.addBoth(rm, server_name) + for server_name, deferred in server_to_deferred.items(): + self.key_downloads[server_name] = deferred + deferred.addBoth(rm, server_name) def get_server_verify_keys(self, verify_requests): """Tries to find at least one key for each verify request @@ -333,7 +342,7 @@ class Keyring(object): Deferred: resolves to dict[str, dict[str, VerifyKey]]: map from server_name -> key_id -> VerifyKey """ - res = yield preserve_context_over_deferred(defer.gatherResults( + res = yield logcontext.make_deferred_yieldable(defer.gatherResults( [ preserve_fn(self.store.get_server_verify_keys)( server_name, key_ids @@ -341,7 +350,7 @@ class Keyring(object): for server_name, key_ids in server_name_and_key_ids ], consumeErrors=True, - )).addErrback(unwrapFirstError) + ).addErrback(unwrapFirstError)) defer.returnValue(dict(res)) @@ -362,13 +371,13 @@ class Keyring(object): ) defer.returnValue({}) - results = yield preserve_context_over_deferred(defer.gatherResults( + results = yield logcontext.make_deferred_yieldable(defer.gatherResults( [ preserve_fn(get_key)(p_name, p_keys) for p_name, p_keys in self.perspective_servers.items() ], consumeErrors=True, - )).addErrback(unwrapFirstError) + ).addErrback(unwrapFirstError)) union_of_keys = {} for result in results: @@ -402,13 +411,13 @@ class Keyring(object): defer.returnValue(keys) - results = yield preserve_context_over_deferred(defer.gatherResults( + results = yield logcontext.make_deferred_yieldable(defer.gatherResults( [ preserve_fn(get_key)(server_name, key_ids) for server_name, key_ids in server_name_and_key_ids ], consumeErrors=True, - )).addErrback(unwrapFirstError) + ).addErrback(unwrapFirstError)) merged = {} for result in results: @@ -485,7 +494,7 @@ class Keyring(object): for server_name, response_keys in processed_response.items(): keys.setdefault(server_name, {}).update(response_keys) - yield preserve_context_over_deferred(defer.gatherResults( + yield logcontext.make_deferred_yieldable(defer.gatherResults( [ preserve_fn(self.store_keys)( server_name=server_name, @@ -495,7 +504,7 @@ class Keyring(object): for server_name, response_keys in keys.items() ], consumeErrors=True - )).addErrback(unwrapFirstError) + ).addErrback(unwrapFirstError)) defer.returnValue(keys) @@ -543,7 +552,7 @@ class Keyring(object): keys.update(response_keys) - yield preserve_context_over_deferred(defer.gatherResults( + yield logcontext.make_deferred_yieldable(defer.gatherResults( [ preserve_fn(self.store_keys)( server_name=key_server_name, @@ -553,7 +562,7 @@ class Keyring(object): for key_server_name, verify_keys in keys.items() ], consumeErrors=True - )).addErrback(unwrapFirstError) + ).addErrback(unwrapFirstError)) defer.returnValue(keys) @@ -619,7 +628,7 @@ class Keyring(object): response_keys.update(verify_keys) response_keys.update(old_verify_keys) - yield preserve_context_over_deferred(defer.gatherResults( + yield logcontext.make_deferred_yieldable(defer.gatherResults( [ preserve_fn(self.store.store_server_keys_json)( server_name=server_name, @@ -632,7 +641,7 @@ class Keyring(object): for key_id in updated_key_ids ], consumeErrors=True, - )).addErrback(unwrapFirstError) + ).addErrback(unwrapFirstError)) results[server_name] = response_keys @@ -710,7 +719,6 @@ class Keyring(object): defer.returnValue(verify_keys) - @defer.inlineCallbacks def store_keys(self, server_name, from_server, verify_keys): """Store a collection of verify keys for a given server Args: @@ -721,7 +729,7 @@ class Keyring(object): A deferred that completes when the keys are stored. """ # TODO(markjh): Store whether the keys have expired. - yield preserve_context_over_deferred(defer.gatherResults( + return logcontext.make_deferred_yieldable(defer.gatherResults( [ preserve_fn(self.store.store_server_verify_key)( server_name, server_name, key.time_added, key @@ -729,4 +737,4 @@ class Keyring(object): for key_id, key in verify_keys.items() ], consumeErrors=True, - )).addErrback(unwrapFirstError) + ).addErrback(unwrapFirstError)) diff --git a/tests/crypto/test_keyring.py b/tests/crypto/test_keyring.py new file mode 100644 index 0000000000..da2c9e44e7 --- /dev/null +++ b/tests/crypto/test_keyring.py @@ -0,0 +1,74 @@ +# -*- coding: utf-8 -*- +# Copyright 2017 New Vector 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 synapse.crypto import keyring +from synapse.util.logcontext import LoggingContext +from tests import utils, unittest +from twisted.internet import defer + + +class KeyringTestCase(unittest.TestCase): + @defer.inlineCallbacks + def setUp(self): + self.hs = yield utils.setup_test_homeserver(handlers=None) + + @defer.inlineCallbacks + def test_wait_for_previous_lookups(self): + sentinel_context = LoggingContext.current_context() + + kr = keyring.Keyring(self.hs) + + def check_context(_, expected): + self.assertEquals( + LoggingContext.current_context().test_key, expected + ) + + lookup_1_deferred = defer.Deferred() + lookup_2_deferred = defer.Deferred() + + with LoggingContext("one") as context_one: + context_one.test_key = "one" + + wait_1_deferred = kr.wait_for_previous_lookups( + ["server1"], + {"server1": lookup_1_deferred}, + ) + + # there were no previous lookups, so the deferred should be ready + self.assertTrue(wait_1_deferred.called) + # ... so we should have preserved the LoggingContext. + self.assertIs(LoggingContext.current_context(), context_one) + wait_1_deferred.addBoth(check_context, "one") + + with LoggingContext("two") as context_two: + context_two.test_key = "two" + + # set off another wait. It should block because the first lookup + # hasn't yet completed. + wait_2_deferred = kr.wait_for_previous_lookups( + ["server1"], + {"server1": lookup_2_deferred}, + ) + self.assertFalse(wait_2_deferred.called) + # ... so we should have reset the LoggingContext. + self.assertIs(LoggingContext.current_context(), sentinel_context) + wait_2_deferred.addBoth(check_context, "two") + + # let the first lookup complete (in the sentinel context) + lookup_1_deferred.callback(None) + + # now the second wait should complete and restore our + # loggingcontext. + yield wait_2_deferred |