diff --git a/changelog.d/7326.misc b/changelog.d/7326.misc
new file mode 100644
index 0000000000..676f285377
--- /dev/null
+++ b/changelog.d/7326.misc
@@ -0,0 +1 @@
+Move catchup of replication streams logic to worker.
diff --git a/synapse/replication/tcp/commands.py b/synapse/replication/tcp/commands.py
index 5002efe6a0..f26aee83cb 100644
--- a/synapse/replication/tcp/commands.py
+++ b/synapse/replication/tcp/commands.py
@@ -462,7 +462,7 @@ def parse_command_from_line(line: str) -> Command:
Line should already be stripped of whitespace and be checked if blank.
"""
- idx = line.index(" ")
+ idx = line.find(" ")
if idx >= 0:
cmd_name = line[:idx]
rest_of_line = line[idx + 1 :]
diff --git a/tests/replication/tcp/test_commands.py b/tests/replication/tcp/test_commands.py
new file mode 100644
index 0000000000..3cbcb513cc
--- /dev/null
+++ b/tests/replication/tcp/test_commands.py
@@ -0,0 +1,42 @@
+# -*- coding: utf-8 -*-
+# Copyright 2020 The Matrix.org Foundation C.I.C.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+from synapse.replication.tcp.commands import (
+ RdataCommand,
+ ReplicateCommand,
+ parse_command_from_line,
+)
+
+from tests.unittest import TestCase
+
+
+class ParseCommandTestCase(TestCase):
+ def test_parse_one_word_command(self):
+ line = "REPLICATE"
+ cmd = parse_command_from_line(line)
+ self.assertIsInstance(cmd, ReplicateCommand)
+
+ def test_parse_rdata(self):
+ line = 'RDATA events 6287863 ["ev", ["$eventid", "!roomid", "type", null, null, null]]'
+ cmd = parse_command_from_line(line)
+ self.assertIsInstance(cmd, RdataCommand)
+ self.assertEqual(cmd.stream_name, "events")
+ self.assertEqual(cmd.token, 6287863)
+
+ def test_parse_rdata_batch(self):
+ line = 'RDATA presence batch ["@foo:example.com", "online"]'
+ cmd = parse_command_from_line(line)
+ self.assertIsInstance(cmd, RdataCommand)
+ self.assertEqual(cmd.stream_name, "presence")
+ self.assertIsNone(cmd.token)
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