Matrix-Mirrors/anonymousland-synapse
1
0
Fork 0
mirror of https://git.anonymousland.org/anonymousland/synapse.git synced 2024-12-26 08:29:24 -05:00
Code Issues Packages Projects Releases Wiki Activity

Add jitter to validity period of attestations

Browse Source 
This helps ensure that the renewals of attestations are spread out more
evenly.
This commit is contained in:
Erik Johnston 2017-10-27 11:57:27 +01:00
parent f009df23ec
commit ca571b0ec3
1 changed files with 12 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
synapse/groups/attestations.py
View File

@ -13,6 +13,8 @@
# See the License for the specific language governing permissions and # See the License for the specific language governing permissions and
# limitations under the License. # limitations under the License.
import random
from twisted.internet import defer from twisted.internet import defer
from synapse.api.errors import SynapseError from synapse.api.errors import SynapseError
@ -25,6 +27,11 @@ from signedjson.sign import sign_json
# Default validity duration for new attestations we create # Default validity duration for new attestations we create
DEFAULT_ATTESTATION_LENGTH_MS = 3 * 24 * 60 * 60 * 1000 DEFAULT_ATTESTATION_LENGTH_MS = 3 * 24 * 60 * 60 * 1000
# We add some jitter to the validity duration of attestations so that if we
# add lots of users at once we don't need to renew them all at once.
# The jitter is a multiplier picked randomly between the first and second number
DEFAULT_ATTESTATION_JITTER = (0.9, 1.3)
# Start trying to update our attestations when they come this close to expiring # Start trying to update our attestations when they come this close to expiring
UPDATE_ATTESTATION_TIME_MS = 1 * 24 * 60 * 60 * 1000 UPDATE_ATTESTATION_TIME_MS = 1 * 24 * 60 * 60 * 1000
@ -73,10 +80,14 @@ class GroupAttestationSigning(object):
"""Create an attestation for the group_id and user_id with default """Create an attestation for the group_id and user_id with default
validity length. validity length.
""" """
validity_period = DEFAULT_ATTESTATION_LENGTH_MS
validity_period *= random.uniform(*DEFAULT_ATTESTATION_JITTER)
valid_until_ms = int(self.clock.time_msec() + validity_period)
return sign_json({ return sign_json({
"group_id": group_id, "group_id": group_id,
"user_id": user_id, "user_id": user_id,
"valid_until_ms": self.clock.time_msec() + DEFAULT_ATTESTATION_LENGTH_MS, "valid_until_ms": valid_until_ms,
}, self.server_name, self.signing_key) }, self.server_name, self.signing_key)