Allow configuring a 'read-only' connection to the homeserver #4145
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This adds a wrapper to
HomeserverConnectionwhich prevents any 'write' operation to be performed on the connection.This is to help rolling out MAS with a simple way to rollback in case of issues.
A better version of this would give feedback on those operations, detect 'read-only' mode and update the UI accordingly. I might do this in another PR.
I also refactored the
HomeserverConnectiontrait to remove the generic error type (because we always usedanyhow::Errorfor now), and also made it so that we always carry anArc<dyn HomeserverConnection>instead of aBox<dyn HomeserverConnection>that is created on the fly