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# -*- coding: utf-8 -*-
# Copyright 2015, 2016 OpenMarket 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.
import synapse.metrics
from lrucache import LruCache
import os
CACHE_SIZE_FACTOR = float(os.environ.get("SYNAPSE_CACHE_FACTOR", 0.1))
DEBUG_CACHES = False
metrics = synapse.metrics.get_metrics_for("synapse.util.caches")
caches_by_name = {}
cache_counter = metrics.register_cache(
"cache",
lambda: {(name,): len(caches_by_name[name]) for name in caches_by_name.keys()},
labels=["name"],
)
_string_cache = LruCache(int(5000 * CACHE_SIZE_FACTOR))
caches_by_name["string_cache"] = _string_cache
KNOWN_KEYS = {
key: key for key in
(
"auth_events",
"content",
"depth",
"event_id",
"hashes",
"origin",
"origin_server_ts",
"prev_events",
"room_id",
"sender",
"signatures",
"state_key",
"type",
"unsigned",
"user_id",
)
}
def intern_string(string):
"""Takes a (potentially) unicode string and interns using custom cache
"""
return _string_cache.setdefault(string, string)
def intern_dict(dictionary):
"""Takes a dictionary and interns well known keys and their values
"""
return _intern_known_values({
_intern_key(key): value for key, value in dictionary.items()
})
def _intern_known_values(dictionary):
intern_str_keys = ("event_id", "room_id")
intern_unicode_keys = ("sender", "user_id", "type", "state_key")
for key in intern_str_keys:
val = dictionary.get(key, None)
if val is not None:
dictionary[key] = intern(val.encode('ascii'))
for key in intern_unicode_keys:
val = dictionary.get(key, None)
if val is not None:
dictionary[key] = intern_string(val)
return dictionary
def _intern_key(key):
return KNOWN_KEYS.get(key, key)
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