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authorSean Quah <8349537+squahtx@users.noreply.github.com>2023-02-10 23:29:00 +0000
committerGitHub <noreply@github.com>2023-02-10 23:29:00 +0000
commitd0c713cc85f094c323b2ba3f02d8ac411a7f0705 (patch)
treec26f279f53c76ea9adb74853d11cfd264675eeb5 /synapse/handlers/room_member.py
parentSupport for MSC3758: exact_event_match push condition (#14964) (diff)
downloadsynapse-d0c713cc85f094c323b2ba3f02d8ac411a7f0705.tar.xz
Return read-only collections from `@cached` methods (#13755)
It's important that collections returned from `@cached` methods are not
modified, otherwise future retrievals from the cache will return the
modified collection.

This applies to the return values from `@cached` methods and the values
inside the dictionaries returned by `@cachedList` methods. It's not
necessary for the dictionaries returned by `@cachedList` methods
themselves to be read-only.

Signed-off-by: Sean Quah <seanq@matrix.org>
Co-authored-by: David Robertson <davidr@element.io>
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