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Enable cancellation of GET /members and GET /state requests #12708

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merged 6 commits into from
May 11, 2022
Merged

Enable cancellation of GET /members and GET /state requests #12708

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8465334
Allow `@cancellable` to be used on methods whose names have suffixes
May 6, 2022
1b90a82
Enable cancellation of `GET /rooms/<room_id>/members` requests
May 6, 2022
5b301d8
Enable cancellation of `GET /rooms/<room_id>/state` requests
May 6, 2022
7acab57
Enable cancellation of `GET /rooms/<room_id>/state/<event_type>/*` re…
May 6, 2022
05e6b68
Add newsfile
May 11, 2022
f24217d
Improve variable name (thanks dmr!)
May 11, 2022
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4 changes: 3 additions & 1 deletion synapse/http/server.py
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Original file line number Diff line number Diff line change
Expand Up @@ -139,7 +139,9 @@ class SomeServlet(RestServlet):
async def on_GET(self, request: SynapseRequest) -> ...:
...
"""
if method.__name__ not in _cancellable_method_names:
if method.__name__ not in _cancellable_method_names and not any(
method.__name__.startswith(name) for name in _cancellable_method_names
):
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For any string x, x.startswith(x). So I think this could be

    if not any(
        method.__name__.startswith(prefix) for prefix in _cancellable_method_names
    ):

but having written that out, I'm not sure if it's clearer.

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Note to self: this is used later when we decorate on_GET_no_state_key.

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My thinking was: the string-in-set test is much faster (O(len(str)) and would succeed for almost every method we would use the decorator on. The prefix test is a lot slower (O(n len(str))), since it has to trawl through the list, and only applies to on_GET_no_state_key.

Not that any of this matters, since it's all startup cost.

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Renaming name to prefix in the generator is a good idea though!

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That's fair. Glad you agree on prefix; I was a bit confused by all the names flying around.

raise ValueError(
"@cancellable decorator can only be applied to servlet methods."
)
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