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Avoid Panic When Fetching Info Before Bridge is Initialized (#504)

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* Allow bridge pallet to return no finalized headers

* Update Runtime APIs to optionally return best finalized header

* Update relay to handle optional best finalized headers

* Fix Clippy lints

* Return a dummy header instead of an Option

* Remove Option from runtime Apis

* Remove support for handling optional finalized headers in relay
This commit is contained in:
Hernando Castano
2020-11-19 10:20:23 -05:00
committed by Bastian Köcher
parent 595523106e
commit e91cab68d4
3 changed files with 32 additions and 8 deletions
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bridges/relays/substrate/src/headers_target.rs
+5 -6
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@@ -91,13 +91,12 @@ where
let decoded_response: Vec<(P::Number, P::Hash)> =
Decode::decode(&mut &encoded_response.0[..]).map_err(SubstrateError::ResponseParseFailed)?;
const WARNING_MSG: &str = "Parsed an empty list of headers, we should always have at least
one. Has the bridge pallet been initialized yet?";
let best_header = decoded_response
// If we parse an empty list of headers it means that bridge pallet has not been initalized
// yet. Otherwise we expect to always have at least one header.
decoded_response
.last()
.ok_or_else(|| SubstrateError::ResponseParseFailed(WARNING_MSG.into()))?;
let best_header_id = HeaderId(best_header.0, best_header.1);
Ok(best_header_id)
.ok_or(SubstrateError::UninitializedBridgePallet)
.map(|(num, hash)| HeaderId(*num, *hash))
}
async fn is_known_header(&self, id: HeaderIdOf<P>) -> Result<(HeaderIdOf<P>, bool), Self::Error> {