[Fix] Cache block requests on the gateway #3369
Merged
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This PR implements caching for block requests so they can be rate limited and matched to inbound block responses. I have also refactored some verbose branching logic to use
match
statements in the second commit. It can be dropped, if a smaller diff is preferred.I've opted to clear the outbound block request cache in the same way as the validator requests (#3254). Time-based expiry isn't necessary as the committee is bounded and the collection is cleared on peer disconnect. Inbound requests use a time-based expiry.
Fixes #3324.