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authorEric Eastwood <erice@element.io>2022-07-20 15:58:51 -0500
committerGitHub <noreply@github.com>2022-07-20 15:58:51 -0500
commit0f971ca68e808dd16f53f5594a6b33b7bddcc9a9 (patch)
tree07e68c0a7bc2d05cc6f6ac2e8905d069bff40872 /changelog.d
parentValidate federation destinations and log an error if server name is invalid. ... (diff)
downloadsynapse-0f971ca68e808dd16f53f5594a6b33b7bddcc9a9.tar.xz
Update `get_pdu` to return the original, pristine `EventBase` (#13320)
Update `get_pdu` to return the untouched, pristine `EventBase` as it was originally seen over federation (no metadata added). Previously, we returned the same `event` reference that we stored in the cache which downstream code modified in place and added metadata like setting it as an `outlier`  and essentially poisoned our cache. Now we always return a copy of the `event` so the original can stay pristine in our cache and re-used for the next cache call.

Split out from https://github.com/matrix-org/synapse/pull/13205

As discussed at:

 - https://github.com/matrix-org/synapse/pull/13205#discussion_r918365746
 - https://github.com/matrix-org/synapse/pull/13205#discussion_r918366125

Related to https://github.com/matrix-org/synapse/issues/12584. This PR doesn't fix that issue because it hits [`get_event` which exists from the local database before it tries to `get_pdu`](https://github.com/matrix-org/synapse/blob/7864f33e286dec22368dc0b11c06eebb1462a51e/synapse/federation/federation_client.py#L581-L594).
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+Fix `FederationClient.get_pdu()` returning events from the cache as `outliers` instead of original events we saw over federation.