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Add a way to fetch the relay state proof #4612

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Add a way to fetch the relay state proof #4612

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e2a5d10
Add a way to fetch the relay state proof
girazoki May 28, 2024
bb429f9
remove ;
girazoki May 28, 2024
6d5b5f3
one more comma
girazoki May 28, 2024
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20 changes: 20 additions & 0 deletions cumulus/pallets/parachain-system/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1694,12 +1694,23 @@ pub trait RelaychainStateProvider {
/// **NOTE**: This is not guaranteed to return monotonically increasing relay parents.
fn current_relay_chain_state() -> RelayChainState;

/// May be called by any runtime module to obtain the current state proof for well known keys.
///
fn current_relay_state_proof() -> Option<sp_trie::StorageProof>;

/// Utility function only to be used in benchmarking scenarios, to be implemented optionally,
/// else a noop.
///
/// It allows for setting a custom RelayChainState.
#[cfg(feature = "runtime-benchmarks")]
fn set_current_relay_chain_state(_state: RelayChainState) {}

/// Utility function only to be used in benchmarking scenarios, to be implemented optionally,
/// else a noop.
///
/// It allows for setting a custom StorageProof.
#[cfg(feature = "runtime-benchmarks")]
fn set_current_relay_state_proof(_proof: sp_trie::StorageProof) {}
}

/// Implements [`BlockNumberProvider`] that returns relay chain block number fetched from validation
Expand Down Expand Up @@ -1757,6 +1768,10 @@ impl<T: Config> RelaychainStateProvider for RelaychainDataProvider<T> {
.unwrap_or_default()
}

fn current_relay_state_proof() -> Option<sp_trie::StorageProof> {
RelayStateProof::<T>::get()
}

#[cfg(feature = "runtime-benchmarks")]
fn set_current_relay_chain_state(state: RelayChainState) {
let mut validation_data = ValidationData::<T>::get().unwrap_or_else(||
Expand All @@ -1771,4 +1786,9 @@ impl<T: Config> RelaychainStateProvider for RelaychainDataProvider<T> {
validation_data.relay_parent_storage_root = state.state_root;
ValidationData::<T>::put(validation_data)
}

#[cfg(feature = "runtime-benchmarks")]
fn set_current_relay_state_proof(proof: sp_trie::StorageProof) {
RelayStateProof::<T>::put(proof)
}
}
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