move 'age' into 'meta' subdict so that it is clearer that it is not part of the signed data

synapse/federation/replication.py

@@ -295,6 +295,10 @@ class ReplicationLayer(object):
         transaction = Transaction(**transaction_data)
 
         for p in transaction.pdus:
+            if "meta" in p:
+                meta = p["meta"]
+                if "age" in meta:
+                    p["age"] = meta["age"]
             if "age" in p:
                 p["age_ts"] = int(self._clock.time_msec()) - int(p["age"])
                 del p["age"]
@@ -414,14 +418,16 @@ class ReplicationLayer(object):
         transmission.
         """
         pdus = [p.get_dict() for p in pdu_list]
+        time_now = self._clock.time_msec()
         for p in pdus:
-            if "age_ts" in pdus:
-                p["age"] = int(self.clock.time_msec()) - p["age_ts"]
-
+            if "age_ts" in p:
+                age = time_now - p["age_ts"]
+                p.setdefault("meta", {})["age"] = int(age)
+                del p["age_ts"]
         return Transaction(
             origin=self.server_name,
             pdus=pdus,
-            ts=int(self._clock.time_msec()),
+            ts=int(time_now),
             destination=None,
         )
 
@@ -589,7 +595,7 @@ class _TransactionQueue(object):
             logger.debug("TX [%s] Persisting transaction...", destination)
 
             transaction = Transaction.create_new(
-                ts=self._clock.time_msec(),
+                ts=int(self._clock.time_msec()),
                 transaction_id=str(self._next_txn_id),
                 origin=self.server_name,
                 destination=destination,
@@ -614,7 +620,9 @@ class _TransactionQueue(object):
                 if "pdus" in data:
                     for p in data["pdus"]:
                         if "age_ts" in p:
-                            p["age"] = now - int(p["age_ts"])
+                            meta = p.setdefault("meta", {})
+                            meta["age"] = now - int(p["age_ts"])
+                            del p["age_ts"]
                 return data
 
             code, response = yield self.transport_layer.send_transaction(

synapse/federation/units.py

@@ -68,11 +68,11 @@ class Pdu(JsonEncodedObject):
         "signatures",
         "is_state",  # Below this are keys valid only for State Pdus.
         "state_key",
-        "power_level",
         "prev_state_id",
         "prev_state_origin",
         "required_power_level",
         "user_id",
+        "meta"
     ]
 
     internal_keys = [
@@ -124,6 +124,10 @@ class Pdu(JsonEncodedObject):
         if pdu_tuple:
             d = copy.copy(pdu_tuple.pdu_entry._asdict())
 
+            for k in d.keys():
+                if d[k] is None:
+                    del d[k]
+
             d["content"] = json.loads(d["content_json"])
             del d["content_json"]