diff options
34 files changed, 148 insertions, 60 deletions
diff --git a/CHANGES.rst b/CHANGES.rst index a7ed49e105..bac78d3c1c 100644 --- a/CHANGES.rst +++ b/CHANGES.rst @@ -1,11 +1,69 @@ -Unreleased -========== +Changes in synapse v0.27.0-rc2 (2018-03-19) +=========================================== + +Pulls in v0.26.1 + +Bug fixes: + +* Fix bug introduced in v0.27.0-rc1 that causes much increased memory usage in state cache (PR #3005) + + +Changes in synapse v0.26.1 (2018-03-15) +======================================= + +Bug fixes: + +* Fix bug where an invalid event caused server to stop functioning correctly, + due to parsing and serializing bugs in ujson library (PR #3008) + -synctl no longer starts the main synapse when using ``-a`` option with workers. -A new worker file should be added with ``worker_app: synapse.app.homeserver``. +Changes in synapse v0.27.0-rc1 (2018-03-14) +=========================================== + +The common case for running Synapse is not to run separate workers, but for those that do, be aware that synctl no longer starts the main synapse when using ``-a`` option with workers. A new worker file should be added with ``worker_app: synapse.app.homeserver``. This release also begins the process of renaming a number of the metrics reported to prometheus. See `docs/metrics-howto.rst <docs/metrics-howto.rst#block-and-response-metrics-renamed-for-0-27-0>`_. +Note that the v0.28.0 release will remove the deprecated metric names. + +Features: + +* Add ability for ASes to override message send time (PR #2754) +* Add support for custom storage providers for media repository (PR #2867, #2777, #2783, #2789, #2791, #2804, #2812, #2814, #2857, #2868, #2767) +* Add purge API features, see `docs/admin_api/purge_history_api.rst <docs/admin_api/purge_history_api.rst>`_ for full details (PR #2858, #2867, #2882, #2946, #2962, #2943) +* Add support for whitelisting 3PIDs that users can register. (PR #2813) +* Add ``/room/{id}/event/{id}`` API (PR #2766) +* Add an admin API to get all the media in a room (PR #2818) Thanks to @turt2live! +* Add ``federation_domain_whitelist`` option (PR #2820, #2821) + + +Changes: + +* Continue to factor out processing from main process and into worker processes. See updated `docs/workers.rst <docs/metrics-howto.rst>`_ (PR #2892 - #2904, #2913, #2920 - #2926, #2947, #2847, #2854, #2872, #2873, #2874, #2928, #2929, #2934, #2856, #2976 - #2984, #2987 - #2989, #2991 - #2993, #2995, #2784) +* Ensure state cache is used when persisting events (PR #2864, #2871, #2802, #2835, #2836, #2841, #2842, #2849) +* Change the default config to bind on both IPv4 and IPv6 on all platforms (PR #2435) Thanks to @silkeh! +* No longer require a specific version of saml2 (PR #2695) Thanks to @okurz! +* Remove ``verbosity``/``log_file`` from generated config (PR #2755) +* Add and improve metrics and logging (PR #2770, #2778, #2785, #2786, #2787, #2793, #2794, #2795, #2809, #2810, #2833, #2834, #2844, #2965, #2927, #2975, #2790, #2796, #2838) +* When using synctl with workers, don't start the main synapse automatically (PR #2774) +* Minor performance improvements (PR #2773, #2792) +* Use a connection pool for non-federation outbound connections (PR #2817) +* Make it possible to run unit tests against postgres (PR #2829) +* Update pynacl dependency to 1.2.1 or higher (PR #2888) Thanks to @bachp! +* Remove ability for AS users to call /events and /sync (PR #2948) +* Use bcrypt.checkpw (PR #2949) Thanks to @krombel! + +Bug fixes: + +* Fix broken ``ldap_config`` config option (PR #2683) Thanks to @seckrv! +* Fix error message when user is not allowed to unban (PR #2761) Thanks to @turt2live! +* Fix publicised groups GET API (singular) over federation (PR #2772) +* Fix user directory when using ``user_directory_search_all_users`` config option (PR #2803, #2831) +* Fix error on ``/publicRooms`` when no rooms exist (PR #2827) +* Fix bug in quarantine_media (PR #2837) +* Fix url_previews when no Content-Type is returned from URL (PR #2845) +* Fix rare race in sync API when joining room (PR #2944) +* Fix slow event search, switch back from GIST to GIN indexes (PR #2769, #2848) Changes in synapse v0.26.0 (2018-01-05) diff --git a/README.rst b/README.rst index 76fe2e4139..ef27b92ddd 100644 --- a/README.rst +++ b/README.rst @@ -354,6 +354,10 @@ https://matrix.org/docs/projects/try-matrix-now.html (or build your own with one Fedora ------ +Synapse is in the Fedora repositories as ``matrix-synapse``:: + + sudo dnf install matrix-synapse + Oleg Girko provides Fedora RPMs at https://obs.infoserver.lv/project/monitor/matrix-synapse @@ -890,6 +894,17 @@ This should end with a 'PASSED' result:: PASSED (successes=143) +Running the Integration Tests +============================= + +Synapse is accompanied by `SyTest <https://github.com/matrix-org/sytest>`_, +a Matrix homeserver integration testing suite, which uses HTTP requests to +access the API as a Matrix client would. It is able to run Synapse directly from +the source tree, so installation of the server is not required. + +Testing with SyTest is recommended for verifying that changes related to the +Client-Server API are functioning correctly. See the `installation instructions +<https://github.com/matrix-org/sytest#installing>`_ for details. Building Internal API Documentation =================================== diff --git a/docs/admin_api/purge_history_api.rst b/docs/admin_api/purge_history_api.rst index ea2922da5c..2da833c827 100644 --- a/docs/admin_api/purge_history_api.rst +++ b/docs/admin_api/purge_history_api.rst @@ -16,9 +16,11 @@ including an ``access_token`` of a server admin. By default, events sent by local users are not deleted, as they may represent the only copies of this content in existence. (Events sent by remote users are -deleted, and room state data before the cutoff is always removed). +deleted.) -To delete local events as well, set ``delete_local_events`` in the body: +Room state data (such as joins, leaves, topic) is always preserved. + +To delete local message events as well, set ``delete_local_events`` in the body: .. code:: json diff --git a/docs/workers.rst b/docs/workers.rst index dee04bbf3e..80f8d2181a 100644 --- a/docs/workers.rst +++ b/docs/workers.rst @@ -230,7 +230,7 @@ file. For example:: ``synapse.app.event_creator`` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -Handles non-state event creation. It can handle REST endpoints matching: +Handles non-state event creation. It can handle REST endpoints matching:: ^/_matrix/client/(api/v1|r0|unstable)/rooms/.*/send diff --git a/synapse/__init__.py b/synapse/__init__.py index ef8853bd24..71b409ba8b 100644 --- a/synapse/__init__.py +++ b/synapse/__init__.py @@ -16,4 +16,4 @@ """ This is a reference implementation of a Matrix home server. """ -__version__ = "0.26.0" +__version__ = "0.27.0-rc2" diff --git a/synapse/api/filtering.py b/synapse/api/filtering.py index 83206348e5..db43219d24 100644 --- a/synapse/api/filtering.py +++ b/synapse/api/filtering.py @@ -17,7 +17,7 @@ from synapse.storage.presence import UserPresenceState from synapse.types import UserID, RoomID from twisted.internet import defer -import ujson as json +import simplejson as json import jsonschema from jsonschema import FormatChecker diff --git a/synapse/config/registration.py b/synapse/config/registration.py index 336959094b..c5384b3ad4 100644 --- a/synapse/config/registration.py +++ b/synapse/config/registration.py @@ -77,7 +77,9 @@ class RegistrationConfig(Config): # Set the number of bcrypt rounds used to generate password hash. # Larger numbers increase the work factor needed to generate the hash. - # The default number of rounds is 12. + # The default number is 12 (which equates to 2^12 rounds). + # N.B. that increasing this will exponentially increase the time required + # to register or login - e.g. 24 => 2^24 rounds which will take >20 mins. bcrypt_rounds: 12 # Allows users to register as guests without a password/email/etc, and diff --git a/synapse/handlers/e2e_keys.py b/synapse/handlers/e2e_keys.py index 31b1ece13e..80b359b2e7 100644 --- a/synapse/handlers/e2e_keys.py +++ b/synapse/handlers/e2e_keys.py @@ -13,7 +13,7 @@ # See the License for the specific language governing permissions and # limitations under the License. -import ujson as json +import simplejson as json import logging from canonicaljson import encode_canonical_json diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py index 4f97c8db79..5a8ddc253e 100644 --- a/synapse/handlers/message.py +++ b/synapse/handlers/message.py @@ -38,7 +38,7 @@ from canonicaljson import encode_canonical_json import logging import random -import ujson +import simplejson logger = logging.getLogger(__name__) @@ -678,8 +678,8 @@ class EventCreationHandler(object): # Ensure that we can round trip before trying to persist in db try: - dump = ujson.dumps(unfreeze(event.content)) - ujson.loads(dump) + dump = simplejson.dumps(unfreeze(event.content)) + simplejson.loads(dump) except Exception: logger.exception("Failed to encode content: %r", event.content) raise diff --git a/synapse/http/server.py b/synapse/http/server.py index 4b567215c8..1551db239d 100644 --- a/synapse/http/server.py +++ b/synapse/http/server.py @@ -37,7 +37,7 @@ from twisted.web.util import redirectTo import collections import logging import urllib -import ujson +import simplejson logger = logging.getLogger(__name__) @@ -461,8 +461,7 @@ def respond_with_json(request, code, json_object, send_cors=False, if canonical_json or synapse.events.USE_FROZEN_DICTS: json_bytes = encode_canonical_json(json_object) else: - # ujson doesn't like frozen_dicts. - json_bytes = ujson.dumps(json_object, ensure_ascii=False) + json_bytes = simplejson.dumps(json_object) return respond_with_json_bytes( request, code, json_bytes, diff --git a/synapse/replication/tcp/commands.py b/synapse/replication/tcp/commands.py index 171227cce2..0005ad5879 100644 --- a/synapse/replication/tcp/commands.py +++ b/synapse/replication/tcp/commands.py @@ -19,7 +19,7 @@ allowed to be sent by which side. """ import logging -import ujson as json +import simplejson logger = logging.getLogger(__name__) @@ -100,14 +100,14 @@ class RdataCommand(Command): return cls( stream_name, None if token == "batch" else int(token), - json.loads(row_json) + simplejson.loads(row_json) ) def to_line(self): return " ".join(( self.stream_name, str(self.token) if self.token is not None else "batch", - json.dumps(self.row), + simplejson.dumps(self.row, namedtuple_as_object=False), )) @@ -298,10 +298,12 @@ class InvalidateCacheCommand(Command): def from_line(cls, line): cache_func, keys_json = line.split(" ", 1) - return cls(cache_func, json.loads(keys_json)) + return cls(cache_func, simplejson.loads(keys_json)) def to_line(self): - return " ".join((self.cache_func, json.dumps(self.keys))) + return " ".join(( + self.cache_func, simplejson.dumps(self.keys, namedtuple_as_object=False) + )) class UserIpCommand(Command): @@ -325,14 +327,14 @@ class UserIpCommand(Command): def from_line(cls, line): user_id, jsn = line.split(" ", 1) - access_token, ip, user_agent, device_id, last_seen = json.loads(jsn) + access_token, ip, user_agent, device_id, last_seen = simplejson.loads(jsn) return cls( user_id, access_token, ip, user_agent, device_id, last_seen ) def to_line(self): - return self.user_id + " " + json.dumps(( + return self.user_id + " " + simplejson.dumps(( self.access_token, self.ip, self.user_agent, self.device_id, self.last_seen, )) diff --git a/synapse/rest/client/v1/room.py b/synapse/rest/client/v1/room.py index f8999d64d7..70d788deea 100644 --- a/synapse/rest/client/v1/room.py +++ b/synapse/rest/client/v1/room.py @@ -30,7 +30,7 @@ from synapse.http.servlet import ( import logging import urllib -import ujson as json +import simplejson as json logger = logging.getLogger(__name__) diff --git a/synapse/rest/client/v2_alpha/sync.py b/synapse/rest/client/v2_alpha/sync.py index a0a8e4b8e4..eb91c0b293 100644 --- a/synapse/rest/client/v2_alpha/sync.py +++ b/synapse/rest/client/v2_alpha/sync.py @@ -33,7 +33,7 @@ from ._base import set_timeline_upper_limit import itertools import logging -import ujson as json +import simplejson as json logger = logging.getLogger(__name__) diff --git a/synapse/rest/media/v1/preview_url_resource.py b/synapse/rest/media/v1/preview_url_resource.py index 31fe7aa75c..0fc21540c6 100644 --- a/synapse/rest/media/v1/preview_url_resource.py +++ b/synapse/rest/media/v1/preview_url_resource.py @@ -23,7 +23,7 @@ import re import shutil import sys import traceback -import ujson as json +import simplejson as json import urlparse from twisted.web.server import NOT_DONE_YET diff --git a/synapse/storage/account_data.py b/synapse/storage/account_data.py index e70c9423e3..f83ff0454a 100644 --- a/synapse/storage/account_data.py +++ b/synapse/storage/account_data.py @@ -23,7 +23,7 @@ from synapse.util.caches.stream_change_cache import StreamChangeCache from synapse.util.caches.descriptors import cached, cachedList, cachedInlineCallbacks import abc -import ujson as json +import simplejson as json import logging logger = logging.getLogger(__name__) diff --git a/synapse/storage/background_updates.py b/synapse/storage/background_updates.py index c88759bf2c..8af325a9f5 100644 --- a/synapse/storage/background_updates.py +++ b/synapse/storage/background_updates.py @@ -19,7 +19,7 @@ from . import engines from twisted.internet import defer -import ujson as json +import simplejson as json import logging logger = logging.getLogger(__name__) diff --git a/synapse/storage/deviceinbox.py b/synapse/storage/deviceinbox.py index 548e795daf..a879e5bfc1 100644 --- a/synapse/storage/deviceinbox.py +++ b/synapse/storage/deviceinbox.py @@ -14,7 +14,7 @@ # limitations under the License. import logging -import ujson +import simplejson from twisted.internet import defer @@ -85,7 +85,7 @@ class DeviceInboxStore(BackgroundUpdateStore): ) rows = [] for destination, edu in remote_messages_by_destination.items(): - edu_json = ujson.dumps(edu) + edu_json = simplejson.dumps(edu) rows.append((destination, stream_id, now_ms, edu_json)) txn.executemany(sql, rows) @@ -177,7 +177,7 @@ class DeviceInboxStore(BackgroundUpdateStore): " WHERE user_id = ?" ) txn.execute(sql, (user_id,)) - message_json = ujson.dumps(messages_by_device["*"]) + message_json = simplejson.dumps(messages_by_device["*"]) for row in txn: # Add the message for all devices for this user on this # server. @@ -199,7 +199,7 @@ class DeviceInboxStore(BackgroundUpdateStore): # Only insert into the local inbox if the device exists on # this server device = row[0] - message_json = ujson.dumps(messages_by_device[device]) + message_json = simplejson.dumps(messages_by_device[device]) messages_json_for_user[device] = message_json if messages_json_for_user: @@ -253,7 +253,7 @@ class DeviceInboxStore(BackgroundUpdateStore): messages = [] for row in txn: stream_pos = row[0] - messages.append(ujson.loads(row[1])) + messages.append(simplejson.loads(row[1])) if len(messages) < limit: stream_pos = current_stream_id return (messages, stream_pos) @@ -389,7 +389,7 @@ class DeviceInboxStore(BackgroundUpdateStore): messages = [] for row in txn: stream_pos = row[0] - messages.append(ujson.loads(row[1])) + messages.append(simplejson.loads(row[1])) if len(messages) < limit: stream_pos = current_stream_id return (messages, stream_pos) diff --git a/synapse/storage/devices.py b/synapse/storage/devices.py index bd2effdf34..712106b83a 100644 --- a/synapse/storage/devices.py +++ b/synapse/storage/devices.py @@ -13,7 +13,7 @@ # See the License for the specific language governing permissions and # limitations under the License. import logging -import ujson as json +import simplejson as json from twisted.internet import defer diff --git a/synapse/storage/end_to_end_keys.py b/synapse/storage/end_to_end_keys.py index 2cebb203c6..ff8538ddf8 100644 --- a/synapse/storage/end_to_end_keys.py +++ b/synapse/storage/end_to_end_keys.py @@ -17,7 +17,7 @@ from twisted.internet import defer from synapse.util.caches.descriptors import cached from canonicaljson import encode_canonical_json -import ujson as json +import simplejson as json from ._base import SQLBaseStore diff --git a/synapse/storage/event_push_actions.py b/synapse/storage/event_push_actions.py index 01f8339825..e78f8d0114 100644 --- a/synapse/storage/event_push_actions.py +++ b/synapse/storage/event_push_actions.py @@ -22,7 +22,7 @@ from synapse.types import RoomStreamToken from .stream import lower_bound import logging -import ujson as json +import simplejson as json logger = logging.getLogger(__name__) diff --git a/synapse/storage/events.py b/synapse/storage/events.py index 3890878170..85ce6bea1a 100644 --- a/synapse/storage/events.py +++ b/synapse/storage/events.py @@ -38,7 +38,7 @@ from functools import wraps import synapse.metrics import logging -import ujson as json +import simplejson as json # these are only included to make the type annotations work from synapse.events import EventBase # noqa: F401 @@ -56,7 +56,6 @@ event_counter = metrics.register_counter( def encode_json(json_object): if USE_FROZEN_DICTS: - # ujson doesn't like frozen_dicts return encode_canonical_json(json_object) else: return json.dumps(json_object, ensure_ascii=False) diff --git a/synapse/storage/events_worker.py b/synapse/storage/events_worker.py index 86c3b48ad4..2e23dd78ba 100644 --- a/synapse/storage/events_worker.py +++ b/synapse/storage/events_worker.py @@ -28,7 +28,7 @@ from synapse.api.errors import SynapseError from collections import namedtuple import logging -import ujson as json +import simplejson as json # these are only included to make the type annotations work from synapse.events import EventBase # noqa: F401 diff --git a/synapse/storage/receipts.py b/synapse/storage/receipts.py index eac8694e0f..63997ed449 100644 --- a/synapse/storage/receipts.py +++ b/synapse/storage/receipts.py @@ -23,7 +23,7 @@ from twisted.internet import defer import abc import logging -import ujson as json +import simplejson as json logger = logging.getLogger(__name__) diff --git a/synapse/storage/room.py b/synapse/storage/room.py index 34ed84ea22..908551d6d9 100644 --- a/synapse/storage/room.py +++ b/synapse/storage/room.py @@ -22,7 +22,7 @@ from synapse.util.caches.descriptors import cached, cachedInlineCallbacks import collections import logging -import ujson as json +import simplejson as json import re logger = logging.getLogger(__name__) diff --git a/synapse/storage/roommember.py b/synapse/storage/roommember.py index 52e19e16b0..d662d1cfc0 100644 --- a/synapse/storage/roommember.py +++ b/synapse/storage/roommember.py @@ -28,7 +28,7 @@ from synapse.api.constants import Membership, EventTypes from synapse.types import get_domain_from_id import logging -import ujson as json +import simplejson as json logger = logging.getLogger(__name__) diff --git a/synapse/storage/schema/delta/25/fts.py b/synapse/storage/schema/delta/25/fts.py index 4269ac69ad..e7351c3ae6 100644 --- a/synapse/storage/schema/delta/25/fts.py +++ b/synapse/storage/schema/delta/25/fts.py @@ -17,7 +17,7 @@ import logging from synapse.storage.prepare_database import get_statements from synapse.storage.engines import PostgresEngine, Sqlite3Engine -import ujson +import simplejson logger = logging.getLogger(__name__) @@ -66,7 +66,7 @@ def run_create(cur, database_engine, *args, **kwargs): "max_stream_id_exclusive": max_stream_id + 1, "rows_inserted": 0, } - progress_json = ujson.dumps(progress) + progress_json = simplejson.dumps(progress) sql = ( "INSERT into background_updates (update_name, progress_json)" diff --git a/synapse/storage/schema/delta/27/ts.py b/synapse/storage/schema/delta/27/ts.py index 71b12a2731..6df57b5206 100644 --- a/synapse/storage/schema/delta/27/ts.py +++ b/synapse/storage/schema/delta/27/ts.py @@ -16,7 +16,7 @@ import logging from synapse.storage.prepare_database import get_statements -import ujson +import simplejson logger = logging.getLogger(__name__) @@ -45,7 +45,7 @@ def run_create(cur, database_engine, *args, **kwargs): "max_stream_id_exclusive": max_stream_id + 1, "rows_inserted": 0, } - progress_json = ujson.dumps(progress) + progress_json = simplejson.dumps(progress) sql = ( "INSERT into background_updates (update_name, progress_json)" diff --git a/synapse/storage/schema/delta/31/search_update.py b/synapse/storage/schema/delta/31/search_update.py index 470ae0c005..fe6b7d196d 100644 --- a/synapse/storage/schema/delta/31/search_update.py +++ b/synapse/storage/schema/delta/31/search_update.py @@ -16,7 +16,7 @@ from synapse.storage.engines import PostgresEngine from synapse.storage.prepare_database import get_statements import logging -import ujson +import simplejson logger = logging.getLogger(__name__) @@ -49,7 +49,7 @@ def run_create(cur, database_engine, *args, **kwargs): "rows_inserted": 0, "have_added_indexes": False, } - progress_json = ujson.dumps(progress) + progress_json = simplejson.dumps(progress) sql = ( "INSERT into background_updates (update_name, progress_json)" diff --git a/synapse/storage/schema/delta/33/event_fields.py b/synapse/storage/schema/delta/33/event_fields.py index 83066cccc9..1e002f9db2 100644 --- a/synapse/storage/schema/delta/33/event_fields.py +++ b/synapse/storage/schema/delta/33/event_fields.py @@ -15,7 +15,7 @@ from synapse.storage.prepare_database import get_statements import logging -import ujson +import simplejson logger = logging.getLogger(__name__) @@ -44,7 +44,7 @@ def run_create(cur, database_engine, *args, **kwargs): "max_stream_id_exclusive": max_stream_id + 1, "rows_inserted": 0, } - progress_json = ujson.dumps(progress) + progress_json = simplejson.dumps(progress) sql = ( "INSERT into background_updates (update_name, progress_json)" diff --git a/synapse/storage/search.py b/synapse/storage/search.py index 2755acff40..984643b057 100644 --- a/synapse/storage/search.py +++ b/synapse/storage/search.py @@ -16,7 +16,7 @@ from collections import namedtuple import logging import re -import ujson as json +import simplejson as json from twisted.internet import defer diff --git a/synapse/storage/tags.py b/synapse/storage/tags.py index fc46bf7bb3..13bff9f055 100644 --- a/synapse/storage/tags.py +++ b/synapse/storage/tags.py @@ -19,7 +19,7 @@ from synapse.storage.account_data import AccountDataWorkerStore from synapse.util.caches.descriptors import cached from twisted.internet import defer -import ujson as json +import simplejson as json import logging logger = logging.getLogger(__name__) diff --git a/synapse/storage/transactions.py b/synapse/storage/transactions.py index 8f61f7ffae..f825264ea9 100644 --- a/synapse/storage/transactions.py +++ b/synapse/storage/transactions.py @@ -23,7 +23,7 @@ from canonicaljson import encode_canonical_json from collections import namedtuple import logging -import ujson as json +import simplejson as json logger = logging.getLogger(__name__) diff --git a/synapse/util/caches/dictionary_cache.py b/synapse/util/caches/dictionary_cache.py index d4105822b3..1709e8b429 100644 --- a/synapse/util/caches/dictionary_cache.py +++ b/synapse/util/caches/dictionary_cache.py @@ -132,9 +132,13 @@ class DictionaryCache(object): self._update_or_insert(key, value, known_absent) def _update_or_insert(self, key, value, known_absent): - entry = self.cache.setdefault(key, DictionaryEntry(False, set(), {})) + # We pop and reinsert as we need to tell the cache the size may have + # changed + + entry = self.cache.pop(key, DictionaryEntry(False, set(), {})) entry.value.update(value) entry.known_absent.update(known_absent) + self.cache[key] = entry def _insert(self, key, value, known_absent): self.cache[key] = DictionaryEntry(True, known_absent, value) diff --git a/synapse/util/caches/lrucache.py b/synapse/util/caches/lrucache.py index f088dd430e..1c5a982094 100644 --- a/synapse/util/caches/lrucache.py +++ b/synapse/util/caches/lrucache.py @@ -154,14 +154,21 @@ class LruCache(object): def cache_set(key, value, callbacks=[]): node = cache.get(key, None) if node is not None: - if value != node.value: + # We sometimes store large objects, e.g. dicts, which cause + # the inequality check to take a long time. So let's only do + # the check if we have some callbacks to call. + if node.callbacks and value != node.value: for cb in node.callbacks: cb() node.callbacks.clear() - if size_callback: - cached_cache_len[0] -= size_callback(node.value) - cached_cache_len[0] += size_callback(value) + # We don't bother to protect this by value != node.value as + # generally size_callback will be cheap compared with equality + # checks. (For example, taking the size of two dicts is quicker + # than comparing them for equality.) + if size_callback: + cached_cache_len[0] -= size_callback(node.value) + cached_cache_len[0] += size_callback(value) node.callbacks.update(callbacks) |