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Expose execution block hash calculation (#4326)

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## Proposed Changes

This is a light refactor of the execution layer's block hash calculation logic making it easier to use externally. e.g. in `eleel` (https://github.com/sigp/eleel/pull/18).

A static method is preferable to a method because the calculation doesn't actually need any data from `self`, and callers may want to compute block hashes without constructing an `ExecutionLayer` (`eleel` only constructs a simpler `Engine` struct).
This commit is contained in:
Michael Sproul 2023-06-02 03:17:37 +00:00
parent 6c769ed86c
commit 04386cfabb
1 changed files with 19 additions and 6 deletions
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25
beacon_node/execution_layer/src/block_hash.rs
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@ -12,12 +12,13 @@ use types::{
};
impl<T: EthSpec> ExecutionLayer<T> {
/// Verify `payload.block_hash` locally within Lighthouse.
/// Calculate the block hash of an execution block.
///
/// No remote calls to the execution client will be made, so this is quite a cheap check.
pub fn verify_payload_block_hash(&self, payload: ExecutionPayloadRef<T>) -> Result<(), Error> {
let _timer = metrics::start_timer(&metrics::EXECUTION_LAYER_VERIFY_BLOCK_HASH);
/// Return `(block_hash, transactions_root)`, where `transactions_root` is the root of the RLP
/// transactions.
pub fn calculate_execution_block_hash(
payload: ExecutionPayloadRef<T>,
) -> (ExecutionBlockHash, Hash256) {
// Calculate the transactions root.
// We're currently using a deprecated Parity library for this. We should move to a
// better alternative when one appears, possibly following Reth.
@ -46,7 +47,19 @@ impl<T: EthSpec> ExecutionLayer<T> {
// Hash the RLP encoding of the block header.
let rlp_block_header = rlp_encode_block_header(&exec_block_header);
let header_hash = ExecutionBlockHash::from_root(keccak256(&rlp_block_header));
(
ExecutionBlockHash::from_root(keccak256(&rlp_block_header)),
rlp_transactions_root,
)
}
/// Verify `payload.block_hash` locally within Lighthouse.
///
/// No remote calls to the execution client will be made, so this is quite a cheap check.
pub fn verify_payload_block_hash(&self, payload: ExecutionPayloadRef<T>) -> Result<(), Error> {
let _timer = metrics::start_timer(&metrics::EXECUTION_LAYER_VERIFY_BLOCK_HASH);
let (header_hash, rlp_transactions_root) = Self::calculate_execution_block_hash(payload);
if header_hash != payload.block_hash() {
return Err(Error::BlockHashMismatch {