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Merge pull request #5333 from matrix-org/rav/server_keys/09_improve_notary_server

Fixes for the key-notary server
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Richard van der Hoff 2019-06-04 11:48:18 +01:00 committed by GitHub
commit cb683d3e3c
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4 changed files with 66 additions and 40 deletions

1
changelog.d/5333.bugfix Normal file
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@ -0,0 +1 @@
Fix various problems which made the signing-key notary server time out for some requests.

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@ -46,6 +46,7 @@ from synapse.api.errors import (
)
from synapse.storage.keys import FetchKeyResult
from synapse.util import logcontext, unwrapFirstError
from synapse.util.async_helpers import yieldable_gather_results
from synapse.util.logcontext import (
LoggingContext,
PreserveLoggingContext,
@ -169,7 +170,12 @@ class Keyring(object):
)
)
logger.debug("Verifying for %s with key_ids %s", server_name, key_ids)
logger.debug(
"Verifying for %s with key_ids %s, min_validity %i",
server_name,
key_ids,
validity_time,
)
# add the key request to the queue, but don't start it off yet.
verify_request = VerifyKeyRequest(
@ -744,34 +750,50 @@ class ServerKeyFetcher(BaseV2KeyFetcher):
self.clock = hs.get_clock()
self.client = hs.get_http_client()
@defer.inlineCallbacks
def get_keys(self, keys_to_fetch):
"""see KeyFetcher.get_keys"""
# TODO make this more resilient
results = yield logcontext.make_deferred_yieldable(
defer.gatherResults(
[
run_in_background(
self.get_server_verify_key_v2_direct,
server_name,
server_keys.keys(),
)
for server_name, server_keys in keys_to_fetch.items()
],
consumeErrors=True,
).addErrback(unwrapFirstError)
)
"""
Args:
keys_to_fetch (dict[str, iterable[str]]):
the keys to be fetched. server_name -> key_ids
merged = {}
for result in results:
merged.update(result)
Returns:
Deferred[dict[str, dict[str, synapse.storage.keys.FetchKeyResult|None]]]:
map from server_name -> key_id -> FetchKeyResult
"""
defer.returnValue(
{server_name: keys for server_name, keys in merged.items() if keys}
results = {}
@defer.inlineCallbacks
def get_key(key_to_fetch_item):
server_name, key_ids = key_to_fetch_item
try:
keys = yield self.get_server_verify_key_v2_direct(server_name, key_ids)
results[server_name] = keys
except KeyLookupError as e:
logger.warning(
"Error looking up keys %s from %s: %s", key_ids, server_name, e
)
except Exception:
logger.exception("Error getting keys %s from %s", key_ids, server_name)
return yieldable_gather_results(get_key, keys_to_fetch.items()).addCallback(
lambda _: results
)
@defer.inlineCallbacks
def get_server_verify_key_v2_direct(self, server_name, key_ids):
"""
Args:
server_name (str):
key_ids (iterable[str]):
Returns:
Deferred[dict[str, FetchKeyResult]]: map from key ID to lookup result
Raises:
KeyLookupError if there was a problem making the lookup
"""
keys = {} # type: dict[str, FetchKeyResult]
for requested_key_id in key_ids:
@ -786,6 +808,19 @@ class ServerKeyFetcher(BaseV2KeyFetcher):
path="/_matrix/key/v2/server/"
+ urllib.parse.quote(requested_key_id),
ignore_backoff=True,
# we only give the remote server 10s to respond. It should be an
# easy request to handle, so if it doesn't reply within 10s, it's
# probably not going to.
#
# Furthermore, when we are acting as a notary server, we cannot
# wait all day for all of the origin servers, as the requesting
# server will otherwise time out before we can respond.
#
# (Note that get_json may make 4 attempts, so this can still take
# almost 45 seconds to fetch the headers, plus up to another 60s to
# read the response).
timeout=10000,
)
except (NotRetryingDestination, RequestSendFailed) as e:
raise_from(KeyLookupError("Failed to connect to remote server"), e)
@ -810,7 +845,7 @@ class ServerKeyFetcher(BaseV2KeyFetcher):
)
keys.update(response_keys)
defer.returnValue({server_name: keys})
defer.returnValue(keys)
@defer.inlineCallbacks

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@ -20,7 +20,7 @@ from twisted.web.resource import Resource
from twisted.web.server import NOT_DONE_YET
from synapse.api.errors import Codes, SynapseError
from synapse.crypto.keyring import KeyLookupError, ServerKeyFetcher
from synapse.crypto.keyring import ServerKeyFetcher
from synapse.http.server import respond_with_json_bytes, wrap_json_request_handler
from synapse.http.servlet import parse_integer, parse_json_object_from_request
@ -215,15 +215,7 @@ class RemoteKey(Resource):
json_results.add(bytes(result["key_json"]))
if cache_misses and query_remote_on_cache_miss:
for server_name, key_ids in cache_misses.items():
try:
yield self.fetcher.get_server_verify_key_v2_direct(
server_name, key_ids
)
except KeyLookupError as e:
logger.info("Failed to fetch key: %s", e)
except Exception:
logger.exception("Failed to get key for %r", server_name)
yield self.fetcher.get_keys(cache_misses)
yield self.query_keys(
request, query, query_remote_on_cache_miss=False
)

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@ -25,11 +25,7 @@ from twisted.internet import defer
from synapse.api.errors import SynapseError
from synapse.crypto import keyring
from synapse.crypto.keyring import (
KeyLookupError,
PerspectivesKeyFetcher,
ServerKeyFetcher,
)
from synapse.crypto.keyring import PerspectivesKeyFetcher, ServerKeyFetcher
from synapse.storage.keys import FetchKeyResult
from synapse.util import logcontext
from synapse.util.logcontext import LoggingContext
@ -364,9 +360,11 @@ class ServerKeyFetcherTestCase(unittest.HomeserverTestCase):
bytes(res["key_json"]), canonicaljson.encode_canonical_json(response)
)
# change the server name: it should cause a rejection
# change the server name: the result should be ignored
response["server_name"] = "OTHER_SERVER"
self.get_failure(fetcher.get_keys(keys_to_fetch), KeyLookupError)
keys = self.get_success(fetcher.get_keys(keys_to_fetch))
self.assertEqual(keys, {})
class PerspectivesKeyFetcherTestCase(unittest.HomeserverTestCase):