Merge branch 'erikj/attestation_jitter' of github.com:matrix-org/synapse into develop

This commit is contained in:
Erik Johnston 2017-10-27 15:09:05 +01:00
commit 6980c4557e
1 changed files with 11 additions and 1 deletions

View File

@ -36,6 +36,7 @@ An attestsation is a signed blob of json that looks like:
"""
import logging
import random
from twisted.internet import defer
@ -52,6 +53,11 @@ logger = logging.getLogger(__name__)
# Default validity duration for new attestations we create
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
UPDATE_ATTESTATION_TIME_MS = 1 * 24 * 60 * 60 * 1000
@ -100,10 +106,14 @@ class GroupAttestationSigning(object):
"""Create an attestation for the group_id and user_id with default
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({
"group_id": group_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)