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Rewrite Datastore.get_server_verify_keys 

Rewrite this so that it doesn't hammer the database.
This commit is contained in:
Richard van der Hoff 2019-04-08 14:51:07 +01:00
parent 0084309cd2
commit 18b69be00f
3 changed files with 113 additions and 52 deletions
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38
synapse/crypto/keyring.py
View File

@ -301,13 +301,12 @@ class Keyring(object):
# complete this VerifyKeyRequest.
result_keys = results.get(server_name, {})
for key_id in verify_request.key_ids:
if key_id in result_keys:
key = result_keys.get(key_id)
if key:
with PreserveLoggingContext():
verify_request.deferred.callback((
server_name,
key_id,
result_keys[key_id],
))
verify_request.deferred.callback(
(server_name, key_id, key)
)
break
else:
# The else block is only reached if the loop above
@ -341,27 +340,24 @@ class Keyring(object):
@defer.inlineCallbacks
def get_keys_from_store(self, server_name_and_key_ids):
"""
Args:
server_name_and_key_ids (list[(str, iterable[str])]):
server_name_and_key_ids (iterable(Tuple[str, iterable[str]]):
list of (server_name, iterable[key_id]) tuples to fetch keys for
Returns:
Deferred: resolves to dict[str, dict[str, VerifyKey]]: map from
Deferred: resolves to dict[str, dict[str, VerifyKey|None]]: map from
server_name -> key_id -> VerifyKey
"""
res = yield logcontext.make_deferred_yieldable(defer.gatherResults(
[
run_in_background(
self.store.get_server_verify_keys,
server_name, key_ids,
).addCallback(lambda ks, server: (server, ks), server_name)
for server_name, key_ids in server_name_and_key_ids
],
consumeErrors=True,
).addErrback(unwrapFirstError))
defer.returnValue(dict(res))
keys_to_fetch = (
(server_name, key_id)
for server_name, key_ids in server_name_and_key_ids
for key_id in key_ids
)
res = yield self.store.get_server_verify_keys(keys_to_fetch)
keys = {}
for (server_name, key_id), key in res.items():
keys.setdefault(server_name, {})[key_id] = key
defer.returnValue(keys)
@defer.inlineCallbacks
def get_keys_from_perspectives(self, server_name_and_key_ids):

74
synapse/storage/keys.py
View File

@ -1,5 +1,6 @@
# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
# Copyright 2019 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.
@ -13,15 +14,15 @@
# See the License for the specific language governing permissions and
# limitations under the License.
import itertools
import logging
import six
from signedjson.key import decode_verify_key_bytes
from twisted.internet import defer
from synapse.util.caches.descriptors import cachedInlineCallbacks
from synapse.util import batch_iter
from synapse.util.caches.descriptors import cached, cachedList
from ._base import SQLBaseStore
@ -38,36 +39,50 @@ else:
class KeyStore(SQLBaseStore):
"""Persistence for signature verification keys
"""
@cachedInlineCallbacks()
def _get_server_verify_key(self, server_name, key_id):
verify_key_bytes = yield self._simple_select_one_onecol(
table="server_signature_keys",
keyvalues={"server_name": server_name, "key_id": key_id},
retcol="verify_key",
desc="_get_server_verify_key",
allow_none=True,
)
if verify_key_bytes:
defer.returnValue(decode_verify_key_bytes(key_id, bytes(verify_key_bytes)))
@cached()
def _get_server_verify_key(self, server_name_and_key_id):
raise NotImplementedError()
@defer.inlineCallbacks
def get_server_verify_keys(self, server_name, key_ids):
"""Retrieve the NACL verification key for a given server for the given
key_ids
@cachedList(
cached_method_name="_get_server_verify_key", list_name="server_name_and_key_ids"
)
def get_server_verify_keys(self, server_name_and_key_ids):
"""
Args:
server_name (str): The name of the server.
key_ids (iterable[str]): key_ids to try and look up.
server_name_and_key_ids (iterable[Tuple[str, str]]):
iterable of (server_name, key-id) tuples to fetch keys for
Returns:
Deferred: resolves to dict[str, VerifyKey]: map from
key_id to verification key.
Deferred: resolves to dict[Tuple[str, str], VerifyKey|None]:
map from (server_name, key_id) -> VerifyKey, or None if the key is
unknown
"""
keys = {}
for key_id in key_ids:
key = yield self._get_server_verify_key(server_name, key_id)
if key:
keys[key_id] = key
defer.returnValue(keys)
def _get_keys(txn, batch):
"""Processes a batch of keys to fetch, and adds the result to `keys`."""
# batch_iter always returns tuples so it's safe to do len(batch)
sql = (
"SELECT server_name, key_id, verify_key FROM server_signature_keys "
"WHERE 1=0"
) + " OR (server_name=? AND key_id=?)" * len(batch)
txn.execute(sql, tuple(itertools.chain.from_iterable(batch)))
for row in txn:
server_name, key_id, key_bytes = row
keys[(server_name, key_id)] = decode_verify_key_bytes(
key_id, bytes(key_bytes)
)
def _txn(txn):
for batch in batch_iter(server_name_and_key_ids, 50):
_get_keys(txn, batch)
return keys
return self.runInteraction("get_server_verify_keys", _txn)
def store_server_verify_key(
self, server_name, from_server, time_now_ms, verify_key
@ -93,8 +108,11 @@ class KeyStore(SQLBaseStore):
"verify_key": db_binary_type(verify_key.encode()),
},
)
# invalidate takes a tuple corresponding to the params of
# _get_server_verify_key. _get_server_verify_key only takes one
# param, which is itself the 2-tuple (server_name, key_id).
txn.call_after(
self._get_server_verify_key.invalidate, (server_name, key_id)
self._get_server_verify_key.invalidate, ((server_name, key_id),)
)
return self.runInteraction("store_server_verify_key", _txn)

53
tests/storage/test_keys.py
View File

@ -15,6 +15,8 @@
import signedjson.key
from twisted.internet.defer import Deferred
import tests.unittest
KEY_1 = signedjson.key.decode_verify_key_base64(
@ -35,10 +37,55 @@ class KeyStoreTestCase(tests.unittest.HomeserverTestCase):
self.get_success(d)
d = store.get_server_verify_keys(
"server1", ["ed25519:key1", "ed25519:key2", "ed25519:key3"]
[
("server1", "ed25519:key1"),
("server1", "ed25519:key2"),
("server1", "ed25519:key3"),
]
)
res = self.get_success(d)
self.assertEqual(len(res.keys()), 3)
self.assertEqual(res[("server1", "ed25519:key1")].version, "key1")
self.assertEqual(res[("server1", "ed25519:key2")].version, "key2")
# non-existent result gives None
self.assertIsNone(res[("server1", "ed25519:key3")])
def test_cache(self):
"""Check that updates correctly invalidate the cache."""
store = self.hs.get_datastore()
key_id_1 = "ed25519:key1"
key_id_2 = "ed25519:key2"
d = store.store_server_verify_key("srv1", "from_server", 0, KEY_1)
self.get_success(d)
d = store.store_server_verify_key("srv1", "from_server", 0, KEY_2)
self.get_success(d)
d = store.get_server_verify_keys([("srv1", key_id_1), ("srv1", key_id_2)])
res = self.get_success(d)
self.assertEqual(len(res.keys()), 2)
self.assertEqual(res["ed25519:key1"].version, "key1")
self.assertEqual(res["ed25519:key2"].version, "key2")
self.assertEqual(res[("srv1", key_id_1)], KEY_1)
self.assertEqual(res[("srv1", key_id_2)], KEY_2)
# we should be able to look up the same thing again without a db hit
res = store.get_server_verify_keys([("srv1", key_id_1)])
if isinstance(res, Deferred):
res = self.successResultOf(res)
self.assertEqual(len(res.keys()), 1)
self.assertEqual(res[("srv1", key_id_1)], KEY_1)
new_key_2 = signedjson.key.get_verify_key(
signedjson.key.generate_signing_key("key2")
)
d = store.store_server_verify_key("srv1", "from_server", 10, new_key_2)
self.get_success(d)
d = store.get_server_verify_keys([("srv1", key_id_1), ("srv1", key_id_2)])
res = self.get_success(d)
self.assertEqual(len(res.keys()), 2)
self.assertEqual(res[("srv1", key_id_1)], KEY_1)
self.assertEqual(res[("srv1", key_id_2)], new_key_2)