diff options
| -rw-r--r-- | synapse/storage/end_to_end_keys.py | 59 |
1 files changed, 50 insertions, 9 deletions
diff --git a/synapse/storage/end_to_end_keys.py b/synapse/storage/end_to_end_keys.py index 58bde65b6c..7cbc1470fd 100644 --- a/synapse/storage/end_to_end_keys.py +++ b/synapse/storage/end_to_end_keys.py @@ -14,6 +14,8 @@ # limitations under the License. from twisted.internet import defer +from synapse.api.errors import SynapseError + from canonicaljson import encode_canonical_json import ujson as json @@ -120,24 +122,63 @@ class EndToEndKeyStore(SQLBaseStore): return result + @defer.inlineCallbacks def add_e2e_one_time_keys(self, user_id, device_id, time_now, key_list): + """Insert some new one time keys for a device. + + Checks if any of the keys are already inserted, if they are then check + if they match. If they don't then we raise an error. + """ + + # First we check if we have already persisted any of the keys. + rows = yield self._simple_select_many_batch( + table="e2e_one_time_keys_json", + column="key_id", + iterable=[key_id for _, key_id, _ in key_list], + retcols=("algorithm", "key_id", "key_json",), + keyvalues={ + "user_id": user_id, + "device_id": device_id, + }, + desc="add_e2e_one_time_keys_check", + ) + + existing_key_map = { + (row["algorithm"], row["key_id"]): row["key_json"] for row in rows + } + + new_keys = [] # Keys that we need to insert + for algorithm, key_id, json_bytes in key_list: + ex_bytes = existing_key_map.get((algorithm, key_id), None) + if ex_bytes: + if json_bytes != ex_bytes: + raise SynapseError( + 400, "One time key with key_id %r already exists" % (key_id,) + ) + else: + new_keys.append((algorithm, key_id, json_bytes)) + def _add_e2e_one_time_keys(txn): - for (algorithm, key_id, json_bytes) in key_list: - self._simple_upsert_txn( - txn, table="e2e_one_time_keys_json", - keyvalues={ + # We are protected from race between lookup and insertion due to + # a unique constraint. If there is a race of two calls to + # `add_e2e_one_time_keys` then they'll conflict and we will only + # insert one set. + self._simple_insert_many_txn( + txn, table="e2e_one_time_keys_json", + values=[ + { "user_id": user_id, "device_id": device_id, "algorithm": algorithm, "key_id": key_id, - }, - values={ "ts_added_ms": time_now, "key_json": json_bytes, } - ) - return self.runInteraction( - "add_e2e_one_time_keys", _add_e2e_one_time_keys + for algorithm, key_id, json_bytes in new_keys + ], + ) + yield self.runInteraction( + "add_e2e_one_time_keys_insert", _add_e2e_one_time_keys ) def count_e2e_one_time_keys(self, user_id, device_id): |