builder: gracefully handle unsupported forks

Author: ralexstokes

mev-build-rs/src/auctioneer/service.rs

@@ -83,7 +83,7 @@ fn prepare_submission(
             blobs_bundle: to_blobs_bundle(payload.sidecars())?,
             signature,
         }),
-        other => unreachable!("fork {other} is not reachable from this type"),
+        fork => return Err(Error::UnsupportedFork(fork)),
     };
     Ok(submission)
 }

mev-build-rs/src/compat.rs

@@ -3,7 +3,7 @@ use ethereum_consensus::{
     crypto::{KzgCommitment, KzgProof},
     primitives::{Bytes32, ExecutionAddress},
     ssz::prelude::{ByteList, ByteVector, SimpleSerializeError, U256},
-    Error as ConsensusError, Fork,
+    Fork,
 };
 use mev_rs::types::{BlobsBundle, ExecutionPayload};
 use reth::primitives::{Address, BlobTransactionSidecar, Bloom, SealedBlock, B256};
@@ -69,7 +69,7 @@ pub fn to_execution_payload(value: &SealedBlock, fork: Fork) -> Result<Execution
             };
             Ok(ExecutionPayload::Deneb(payload))
         }
-        fork => Err(Error::Consensus(ConsensusError::UnsupportedFork(fork))),
+        fork => Err(Error::UnsupportedFork(fork)),
     }
 }
 

mev-build-rs/src/error.rs

@@ -1,10 +1,12 @@
 use alloy_signer_wallet::WalletError;
-use ethereum_consensus::Error as ConsensusError;
+use ethereum_consensus::{Error as ConsensusError, Fork};
 use reth::payload::error::PayloadBuilderError;
 use thiserror::Error;
 
 #[derive(Error, Debug)]
 pub enum Error {
+    #[error("fork {0} is not supported for this operation")]
+    UnsupportedFork(Fork),
     #[error(transparent)]
     Consensus(#[from] ConsensusError),
     #[error(transparent)]