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Merge pull request #215 from matrix-org/erikj/cache_varargs_interface 

Change Cache to not use *args in its interface
This commit is contained in:
Erik Johnston 2015-08-10 13:47:45 +01:00
parent 06218ab125 86eaaa885b
commit 8c3a62b5c7
12 changed files with 73 additions and 72 deletions
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4
synapse/storage/__init__.py
View File

@ -99,7 +99,7 @@ class DataStore(RoomMemberStore, RoomStore,
key = (user.to_string(), access_token, device_id, ip)
try:
last_seen = self.client_ip_last_seen.get(*key)
last_seen = self.client_ip_last_seen.get(key)
except KeyError:
last_seen = None
@ -107,7 +107,7 @@ class DataStore(RoomMemberStore, RoomStore,
if last_seen is not None and (now - last_seen) < LAST_SEEN_GRANULARITY:
defer.returnValue(None)
self.client_ip_last_seen.prefill(*key + (now,))
self.client_ip_last_seen.prefill(key, now)
# It's safe not to lock here: a) no unique constraint,
# b) LAST_SEEN_GRANULARITY makes concurrent updates incredibly unlikely

67
synapse/storage/_base.py
View File

@ -57,6 +57,9 @@ cache_counter = metrics.register_cache(
)
_CacheSentinel = object()
class Cache(object):
def __init__(self, name, max_entries=1000, keylen=1, lru=True):
@ -83,45 +86,42 @@ class Cache(object):
"Cache objects can only be accessed from the main thread"
)
def get(self, *keyargs):
if len(keyargs) != self.keylen:
raise ValueError("Expected a key to have %d items", self.keylen)
if keyargs in self.cache:
def get(self, key, default=_CacheSentinel):
val = self.cache.get(key, _CacheSentinel)
if val is not _CacheSentinel:
cache_counter.inc_hits(self.name)
return self.cache[keyargs]
return val
cache_counter.inc_misses(self.name)
raise KeyError()
def update(self, sequence, *args):
if default is _CacheSentinel:
raise KeyError()
else:
return default
def update(self, sequence, key, value):
self.check_thread()
if self.sequence == sequence:
# Only update the cache if the caches sequence number matches the
# number that the cache had before the SELECT was started (SYN-369)
self.prefill(*args)
def prefill(self, *args): # because I can't *keyargs, value
keyargs = args[:-1]
value = args[-1]
if len(keyargs) != self.keylen:
raise ValueError("Expected a key to have %d items", self.keylen)
self.prefill(key, value)
def prefill(self, key, value):
if self.max_entries is not None:
while len(self.cache) >= self.max_entries:
self.cache.popitem(last=False)
self.cache[keyargs] = value
self.cache[key] = value
def invalidate(self, *keyargs):
def invalidate(self, key):
self.check_thread()
if len(keyargs) != self.keylen:
raise ValueError("Expected a key to have %d items", self.keylen)
if not isinstance(key, tuple):
raise ValueError("keyargs must be a tuple.")
# Increment the sequence number so that any SELECT statements that
# raced with the INSERT don't update the cache (SYN-369)
self.sequence += 1
self.cache.pop(keyargs, None)
self.cache.pop(key, None)
def invalidate_all(self):
self.check_thread()
@ -168,20 +168,21 @@ class CacheDescriptor(object):
% (orig.__name__,)
)
def __get__(self, obj, objtype=None):
cache = Cache(
self.cache = Cache(
name=self.orig.__name__,
max_entries=self.max_entries,
keylen=self.num_args,
lru=self.lru,
)
def __get__(self, obj, objtype=None):
@functools.wraps(self.orig)
def wrapped(*args, **kwargs):
arg_dict = inspect.getcallargs(self.orig, obj, *args, **kwargs)
keyargs = [arg_dict[arg_nm] for arg_nm in self.arg_names]
cache_key = tuple(arg_dict[arg_nm] for arg_nm in self.arg_names)
try:
cached_result_d = cache.get(*keyargs)
cached_result_d = self.cache.get(cache_key)
observer = cached_result_d.observe()
if DEBUG_CACHES:
@ -191,7 +192,7 @@ class CacheDescriptor(object):
if actual_result != cached_result:
logger.error(
"Stale cache entry %s%r: cached: %r, actual %r",
self.orig.__name__, keyargs,
self.orig.__name__, cache_key,
cached_result, actual_result,
)
raise ValueError("Stale cache entry")
@ -203,7 +204,7 @@ class CacheDescriptor(object):
# Get the sequence number of the cache before reading from the
# database so that we can tell if the cache is invalidated
# while the SELECT is executing (SYN-369)
sequence = cache.sequence
sequence = self.cache.sequence
ret = defer.maybeDeferred(
self.function_to_call,
@ -211,19 +212,19 @@ class CacheDescriptor(object):
)
def onErr(f):
cache.invalidate(*keyargs)
self.cache.invalidate(cache_key)
return f
ret.addErrback(onErr)
ret = ObservableDeferred(ret, consumeErrors=False)
cache.update(sequence, *(keyargs + [ret]))
ret = ObservableDeferred(ret, consumeErrors=True)
self.cache.update(sequence, cache_key, ret)
return ret.observe()
wrapped.invalidate = cache.invalidate
wrapped.invalidate_all = cache.invalidate_all
wrapped.prefill = cache.prefill
wrapped.invalidate = self.cache.invalidate
wrapped.invalidate_all = self.cache.invalidate_all
wrapped.prefill = self.cache.prefill
obj.__dict__[self.orig.__name__] = wrapped

4
synapse/storage/directory.py
View File

@ -104,7 +104,7 @@ class DirectoryStore(SQLBaseStore):
},
desc="create_room_alias_association",
)
self.get_aliases_for_room.invalidate(room_id)
self.get_aliases_for_room.invalidate((room_id,))
@defer.inlineCallbacks
def delete_room_alias(self, room_alias):
@ -114,7 +114,7 @@ class DirectoryStore(SQLBaseStore):
room_alias,
)
self.get_aliases_for_room.invalidate(room_id)
self.get_aliases_for_room.invalidate((room_id,))
defer.returnValue(room_id)
def _delete_room_alias_txn(self, txn, room_alias):

4
synapse/storage/event_federation.py
View File

@ -362,7 +362,7 @@ class EventFederationStore(SQLBaseStore):
for room_id in events_by_room:
txn.call_after(
self.get_latest_event_ids_in_room.invalidate, room_id
self.get_latest_event_ids_in_room.invalidate, (room_id,)
)
def get_backfill_events(self, room_id, event_list, limit):
@ -505,4 +505,4 @@ class EventFederationStore(SQLBaseStore):
query = "DELETE FROM event_forward_extremities WHERE room_id = ?"
txn.execute(query, (room_id,))
txn.call_after(self.get_latest_event_ids_in_room.invalidate, room_id)
txn.call_after(self.get_latest_event_ids_in_room.invalidate, (room_id,))

19
synapse/storage/events.py
View File

@ -162,8 +162,8 @@ class EventsStore(SQLBaseStore):
if current_state:
txn.call_after(self.get_current_state_for_key.invalidate_all)
txn.call_after(self.get_rooms_for_user.invalidate_all)
txn.call_after(self.get_users_in_room.invalidate, event.room_id)
txn.call_after(self.get_joined_hosts_for_room.invalidate, event.room_id)
txn.call_after(self.get_users_in_room.invalidate, (event.room_id,))
txn.call_after(self.get_joined_hosts_for_room.invalidate, (event.room_id,))
txn.call_after(self.get_room_name_and_aliases, event.room_id)
self._simple_delete_txn(
@ -430,13 +430,13 @@ class EventsStore(SQLBaseStore):
if not context.rejected:
txn.call_after(
self.get_current_state_for_key.invalidate,
event.room_id, event.type, event.state_key
(event.room_id, event.type, event.state_key,)
)
if event.type in [EventTypes.Name, EventTypes.Aliases]:
txn.call_after(
self.get_room_name_and_aliases.invalidate,
event.room_id
(event.room_id,)
)
self._simple_upsert_txn(
@ -567,8 +567,9 @@ class EventsStore(SQLBaseStore):
def _invalidate_get_event_cache(self, event_id):
for check_redacted in (False, True):
for get_prev_content in (False, True):
self._get_event_cache.invalidate(event_id, check_redacted,
get_prev_content)
self._get_event_cache.invalidate(
(event_id, check_redacted, get_prev_content)
)
def _get_event_txn(self, txn, event_id, check_redacted=True,
get_prev_content=False, allow_rejected=False):
@ -589,7 +590,7 @@ class EventsStore(SQLBaseStore):
for event_id in events:
try:
ret = self._get_event_cache.get(
event_id, check_redacted, get_prev_content
(event_id, check_redacted, get_prev_content,)
)
if allow_rejected or not ret.rejected_reason:
@ -822,7 +823,7 @@ class EventsStore(SQLBaseStore):
ev.unsigned["prev_content"] = prev.get_dict()["content"]
self._get_event_cache.prefill(
ev.event_id, check_redacted, get_prev_content, ev
(ev.event_id, check_redacted, get_prev_content), ev
)
defer.returnValue(ev)
@ -879,7 +880,7 @@ class EventsStore(SQLBaseStore):
ev.unsigned["prev_content"] = prev.get_dict()["content"]
self._get_event_cache.prefill(
ev.event_id, check_redacted, get_prev_content, ev
(ev.event_id, check_redacted, get_prev_content), ev
)
return ev

2
synapse/storage/keys.py
View File

@ -131,7 +131,7 @@ class KeyStore(SQLBaseStore):
desc="store_server_verify_key",
)
self.get_all_server_verify_keys.invalidate(server_name)
self.get_all_server_verify_keys.invalidate((server_name,))
def store_server_keys_json(self, server_name, key_id, from_server,
ts_now_ms, ts_expires_ms, key_json_bytes):

4
synapse/storage/presence.py
View File

@ -98,7 +98,7 @@ class PresenceStore(SQLBaseStore):
updatevalues={"accepted": True},
desc="set_presence_list_accepted",
)
self.get_presence_list_accepted.invalidate(observer_localpart)
self.get_presence_list_accepted.invalidate((observer_localpart,))
defer.returnValue(result)
def get_presence_list(self, observer_localpart, accepted=None):
@ -133,4 +133,4 @@ class PresenceStore(SQLBaseStore):
"observed_user_id": observed_userid},
desc="del_presence_list",
)
self.get_presence_list_accepted.invalidate(observer_localpart)
self.get_presence_list_accepted.invalidate((observer_localpart,))

16
synapse/storage/push_rule.py
View File

@ -151,11 +151,11 @@ class PushRuleStore(SQLBaseStore):
txn.execute(sql, (user_name, priority_class, new_rule_priority))
txn.call_after(
self.get_push_rules_for_user.invalidate, user_name
self.get_push_rules_for_user.invalidate, (user_name,)
)
txn.call_after(
self.get_push_rules_enabled_for_user.invalidate, user_name
self.get_push_rules_enabled_for_user.invalidate, (user_name,)
)
self._simple_insert_txn(
@ -187,10 +187,10 @@ class PushRuleStore(SQLBaseStore):
new_rule['priority'] = new_prio
txn.call_after(
self.get_push_rules_for_user.invalidate, user_name
self.get_push_rules_for_user.invalidate, (user_name,)
)
txn.call_after(
self.get_push_rules_enabled_for_user.invalidate, user_name
self.get_push_rules_enabled_for_user.invalidate, (user_name,)
)
self._simple_insert_txn(
@ -216,8 +216,8 @@ class PushRuleStore(SQLBaseStore):
desc="delete_push_rule",
)
self.get_push_rules_for_user.invalidate(user_name)
self.get_push_rules_enabled_for_user.invalidate(user_name)
self.get_push_rules_for_user.invalidate((user_name,))
self.get_push_rules_enabled_for_user.invalidate((user_name,))
@defer.inlineCallbacks
def set_push_rule_enabled(self, user_name, rule_id, enabled):
@ -238,10 +238,10 @@ class PushRuleStore(SQLBaseStore):
{'id': new_id},
)
txn.call_after(
self.get_push_rules_for_user.invalidate, user_name
self.get_push_rules_for_user.invalidate, (user_name,)
)
txn.call_after(
self.get_push_rules_enabled_for_user.invalidate, user_name
self.get_push_rules_enabled_for_user.invalidate, (user_name,)
)

2
synapse/storage/registration.py
View File

@ -131,7 +131,7 @@ class RegistrationStore(SQLBaseStore):
user_id
)
for r in rows:
self.get_user_by_token.invalidate(r)
self.get_user_by_token.invalidate((r,))
@cached()
def get_user_by_token(self, token):

6
synapse/storage/roommember.py
View File

@ -54,9 +54,9 @@ class RoomMemberStore(SQLBaseStore):
)
for event in events:
txn.call_after(self.get_rooms_for_user.invalidate, event.state_key)
txn.call_after(self.get_joined_hosts_for_room.invalidate, event.room_id)
txn.call_after(self.get_users_in_room.invalidate, event.room_id)
txn.call_after(self.get_rooms_for_user.invalidate, (event.state_key,))
txn.call_after(self.get_joined_hosts_for_room.invalidate, (event.room_id,))
txn.call_after(self.get_users_in_room.invalidate, (event.room_id,))
def get_room_member(self, user_id, room_id):
"""Retrieve the current state of a room member.

3
synapse/storage/state.py
View File

@ -13,7 +13,7 @@
# See the License for the specific language governing permissions and
# limitations under the License.
from ._base import SQLBaseStore, cached, cachedInlineCallbacks
from ._base import SQLBaseStore, cachedInlineCallbacks
from twisted.internet import defer
@ -91,7 +91,6 @@ class StateStore(SQLBaseStore):
defer.returnValue(dict(state_list))
@cached(num_args=1)
def _fetch_events_for_group(self, key, events):
return self._get_events(
events, get_prev_content=False

12
tests/storage/test__base.py
View File

@ -42,12 +42,12 @@ class CacheTestCase(unittest.TestCase):
self.assertEquals(self.cache.get("foo"), 123)
def test_invalidate(self):
self.cache.prefill("foo", 123)
self.cache.invalidate("foo")
self.cache.prefill(("foo",), 123)
self.cache.invalidate(("foo",))
failed = False
try:
self.cache.get("foo")
self.cache.get(("foo",))
except KeyError:
failed = True
@ -141,7 +141,7 @@ class CacheDecoratorTestCase(unittest.TestCase):
self.assertEquals(callcount[0], 1)
a.func.invalidate("foo")
a.func.invalidate(("foo",))
yield a.func("foo")
@ -153,7 +153,7 @@ class CacheDecoratorTestCase(unittest.TestCase):
def func(self, key):
return key
A().func.invalidate("what")
A().func.invalidate(("what",))
@defer.inlineCallbacks
def test_max_entries(self):
@ -193,7 +193,7 @@ class CacheDecoratorTestCase(unittest.TestCase):
a = A()
a.func.prefill("foo", ObservableDeferred(d))
a.func.prefill(("foo",), ObservableDeferred(d))
self.assertEquals(a.func("foo").result, d.result)
self.assertEquals(callcount[0], 0)