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authorErik Johnston <erik@matrix.org>2017-11-07 13:32:35 +0000
committerErik Johnston <erik@matrix.org>2017-11-07 13:32:35 +0000
commit76c9af193cb46337cd1e618b46508d7f0ee912e7 (patch)
tree769917ca0abb14e2cab4dd979e397dd10bebe0a7 /synapse/groups
parentMerge branch 'master' of github.com:matrix-org/synapse into develop (diff)
downloadsynapse-76c9af193cb46337cd1e618b46508d7f0ee912e7.tar.xz
Revert "Merge branch 'master' of github.com:matrix-org/synapse into develop"
This reverts commit f9b255cd62fe724e16b2222f6af623b2d39282ab, reversing
changes made to 1bd654dabde776bbb7ee365c115b307cd6a110b8.
Diffstat (limited to '')
-rw-r--r--synapse/groups/attestations.py11
1 files changed, 10 insertions, 1 deletions
diff --git a/synapse/groups/attestations.py b/synapse/groups/attestations.py
index 784af9cbcf..1fb709e6c3 100644
--- a/synapse/groups/attestations.py
+++ b/synapse/groups/attestations.py
@@ -53,6 +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
 
@@ -101,10 +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)