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Fix device list update stream ids going backward (#7158)

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Occasionally we could get a federation device list update transaction which
looked like:

```
[
    {'edu_type': 'm.device_list_update', 'content': {'user_id': '@user:test', 'device_id': 'D2', 'prev_id': [], 'stream_id': 12, 'deleted': True}},
    {'edu_type': 'm.device_list_update', 'content': {'user_id': '@user:test', 'device_id': 'D1', 'prev_id': [12], 'stream_id': 11, 'deleted': True}},
    {'edu_type': 'm.device_list_update', 'content': {'user_id': '@user:test', 'device_id': 'D3', 'prev_id': [11], 'stream_id': 13, 'deleted': True}}
]
```

Having `stream_ids` which are lower than `prev_ids` looks odd. It might work
(I'm not actually sure), but in any case it doesn't seem like a reasonable
thing to expect other implementations to support.
This commit is contained in:
Richard van der Hoff 2020-04-03 10:40:22 +01:00 • committed by GitHub
parent 61bb834364
commit daa1ac89a0
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3 changed files with 15 additions and 2 deletions
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10
synapse/storage/data_stores/main/devices.py
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@ -165,7 +165,6 @@ class DeviceWorkerStore(SQLBaseStore):
# the max stream_id across each set of duplicate entries
#
# maps (user_id, device_id) -> (stream_id, opentracing_context)
# as long as their stream_id does not match that of the last row
#
# opentracing_context contains the opentracing metadata for the request
# that created the poke
@ -270,7 +269,14 @@ class DeviceWorkerStore(SQLBaseStore):
prev_id = yield self._get_last_device_update_for_remote_user(
destination, user_id, from_stream_id
)
for device_id, device in iteritems(user_devices):
# make sure we go through the devices in stream order
device_ids = sorted(
user_devices.keys(), key=lambda i: query_map[(user_id, i)][0],
)
for device_id in device_ids:
device = user_devices[device_id]
stream_id, opentracing_context = query_map[(user_id, device_id)]
result = {
"user_id": user_id,