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authorPatrick Cloke <clokep@users.noreply.github.com>2023-04-20 12:30:32 -0400
committerGitHub <noreply@github.com>2023-04-20 12:30:32 -0400
commit5e024a0645733a816dc0da21a034dd70b053f2be (patch)
treea57b7295fcba41e7bc73301532867ee72e661b49 /docs/message_retention_policies.md
parentMerge branch 'release-v1.82' into develop (diff)
downloadsynapse-5e024a0645733a816dc0da21a034dd70b053f2be.tar.xz
Modify StoreKeyFetcher to read from server_keys_json. (#15417)
Before this change:

* `PerspectivesKeyFetcher` and `ServerKeyFetcher` write to `server_keys_json`.
* `PerspectivesKeyFetcher` also writes to `server_signature_keys`.
* `StoreKeyFetcher` reads from `server_signature_keys`.

After this change:

* `PerspectivesKeyFetcher` and `ServerKeyFetcher` write to `server_keys_json`.
* `PerspectivesKeyFetcher` also writes to `server_signature_keys`.
* `StoreKeyFetcher` reads from `server_keys_json`.

This results in `StoreKeyFetcher` now using the results from `ServerKeyFetcher`
in addition to those from `PerspectivesKeyFetcher`, i.e. keys which are directly
fetched from a server will now be pulled from the database instead of refetched.

An additional minor change is included to avoid creating a `PerspectivesKeyFetcher`
(and checking it) if no `trusted_key_servers` are configured.

The overall impact of this should be better usage of cached results:

* If a server has no trusted key servers configured then it should reduce how often keys
  are fetched.
* if a server's trusted key server does not have a requested server's keys cached then it
  should reduce how often keys are directly fetched.
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