feat: eip-7251

crates/ethereum/evm/src/execute.rs

@@ -11,7 +11,10 @@ use reth_evm::{
         BatchExecutor, BlockExecutionError, BlockExecutionInput, BlockExecutionOutput,
         BlockExecutorProvider, BlockValidationError, Executor, ProviderError,
     },
-    system_calls::{apply_beacon_root_contract_call, apply_withdrawal_requests_contract_call},
+    system_calls::{
+        apply_beacon_root_contract_call, apply_consolidation_requests_contract_call,
+        apply_withdrawal_requests_contract_call,
+    },
     ConfigureEvm,
 };
 use reth_execution_types::ExecutionOutcome;
@@ -223,7 +226,11 @@ where
             let withdrawal_requests =
                 apply_withdrawal_requests_contract_call(&self.evm_config, &mut evm)?;
 
-            [deposit_requests, withdrawal_requests].concat()
+            // Collect all EIP-7251 requests
+            let consolidation_requests =
+                apply_consolidation_requests_contract_call(&self.evm_config, &mut evm)?;
+
+            [deposit_requests, withdrawal_requests, consolidation_requests].concat()
         } else {
             vec![]
         };

crates/evm/execution-errors/src/lib.rs

@@ -98,6 +98,14 @@ pub enum BlockValidationError {
         /// The error message.
         message: String,
     },
+    /// EVM error during consolidation requests contract call [EIP-7251]
+    ///
+    /// [EIP-7251]: https://eips.ethereum.org/EIPS/eip-7251
+    #[error("failed to apply consolidation requests contract call: {message}")]
+    ConsolidationRequestsContractCall {
+        /// The error message.
+        message: String,
+    },
     /// Error when decoding deposit requests from receipts [EIP-6110]
     ///
     /// [EIP-6110]: https://eips.ethereum.org/EIPS/eip-6110

crates/evm/src/system_calls.rs

@@ -4,6 +4,7 @@ use crate::ConfigureEvm;
 use alloy_eips::{
     eip4788::BEACON_ROOTS_ADDRESS,
     eip7002::{WithdrawalRequest, WITHDRAWAL_REQUEST_PREDEPLOY_ADDRESS},
+    eip7251::{ConsolidationRequest, CONSOLIDATION_REQUEST_PREDEPLOY_ADDRESS},
 };
 use reth_chainspec::{ChainSpec, EthereumHardforks};
 use reth_execution_errors::{BlockExecutionError, BlockValidationError};
@@ -264,3 +265,138 @@ where
 
     Ok(withdrawal_requests)
 }
+
+/// Apply the [EIP-7251](https://eips.ethereum.org/EIPS/eip-7251) post block contract call.
+///
+/// This constructs a new [Evm] with the given DB, and environment
+/// ([`CfgEnvWithHandlerCfg`] and [`BlockEnv`]) to execute the post block contract call.
+///
+/// This uses [`apply_consolidation_requests_contract_call`] to ultimately calculate the
+/// [requests](Request).
+pub fn post_block_consolidation_requests_contract_call<EvmConfig, DB>(
+    evm_config: &EvmConfig,
+    db: &mut DB,
+    initialized_cfg: &CfgEnvWithHandlerCfg,
+    initialized_block_env: &BlockEnv,
+) -> Result<Vec<Request>, BlockExecutionError>
+where
+    DB: Database + DatabaseCommit,
+    DB::Error: std::fmt::Display,
+    EvmConfig: ConfigureEvm,
+{
+    // apply post-block EIP-7251 contract call
+    let mut evm_post_block = Evm::builder()
+        .with_db(db)
+        .with_env_with_handler_cfg(EnvWithHandlerCfg::new_with_cfg_env(
+            initialized_cfg.clone(),
+            initialized_block_env.clone(),
+            Default::default(),
+        ))
+        .build();
+
+    // initialize a block from the env, because the post block call needs the block itself
+    apply_consolidation_requests_contract_call::<EvmConfig, _, _>(evm_config, &mut evm_post_block)
+}
+
+/// Applies the post-block call to the EIP-7251 consolidation requests contract.
+///
+/// If Prague is not active at the given timestamp, then this is a no-op, and an empty vector is
+/// returned. Otherwise, the consolidation requests are returned.
+#[inline]
+pub fn apply_consolidation_requests_contract_call<EvmConfig, EXT, DB>(
+    evm_config: &EvmConfig,
+    evm: &mut Evm<'_, EXT, DB>,
+) -> Result<Vec<Request>, BlockExecutionError>
+where
+    DB: Database + DatabaseCommit,
+    DB::Error: core::fmt::Display,
+    EvmConfig: ConfigureEvm,
+{
+    // get previous env
+    let previous_env = Box::new(evm.context.env().clone());
+
+    // Fill transaction environment with the EIP-7251 consolidation requests contract message data.
+    //
+    // This requirement for the consolidation requests contract call defined by
+    // [EIP-7251](https://eips.ethereum.org/EIPS/eip-7251) is:
+    //
+    // At the end of processing any execution block where block.timestamp >= FORK_TIMESTAMP (i.e.
+    // after processing all transactions and after performing the block body requests validations)
+    // clienst software MUST [..] call the contract as `SYSTEM_ADDRESS` and empty input data to
+    // trigger the system subroutine execute.
+    evm_config.fill_tx_env_system_contract_call(
+        &mut evm.context.evm.env,
+        alloy_eips::eip7002::SYSTEM_ADDRESS,
+        CONSOLIDATION_REQUEST_PREDEPLOY_ADDRESS,
+        Bytes::new(),
+    );
+
+    let ResultAndState { result, mut state } = match evm.transact() {
+        Ok(res) => res,
+        Err(e) => {
+            evm.context.evm.env = previous_env;
+            return Err(BlockValidationError::ConsolidationRequestsContractCall {
+                message: format!("execution failed: {e}"),
+            }
+            .into())
+        }
+    };
+
+    // cleanup the state
+    state.remove(&alloy_eips::eip7002::SYSTEM_ADDRESS);
+    state.remove(&evm.block().coinbase);
+    evm.context.evm.db.commit(state);
+
+    // re-set the previous env
+    evm.context.evm.env = previous_env;
+
+    let mut data = match result {
+        ExecutionResult::Success { output, .. } => Ok(output.into_data()),
+        ExecutionResult::Revert { output, .. } => {
+            Err(BlockValidationError::ConsolidationRequestsContractCall {
+                message: format!("execution reverted: {output}"),
+            })
+        }
+        ExecutionResult::Halt { reason, .. } => {
+            Err(BlockValidationError::ConsolidationRequestsContractCall {
+                message: format!("execution halted: {reason:?}"),
+            })
+        }
+    }?;
+
+    // Consolidations are encoded as a series of consolidation requests, each with the following
+    // format:
+    //
+    // +------+--------+---------------+
+    // | addr | pubkey | target pubkey |
+    // +------+--------+---------------+
+    //    20      48        48
+
+    const CONSOLIDATION_REQUEST_SIZE: usize = 20 + 48 + 48;
+    let mut consolidation_requests = Vec::with_capacity(data.len() / CONSOLIDATION_REQUEST_SIZE);
+    while data.has_remaining() {
+        if data.remaining() < CONSOLIDATION_REQUEST_SIZE {
+            return Err(BlockValidationError::ConsolidationRequestsContractCall {
+                message: "invalid consolidation request length".to_string(),
+            }
+            .into())
+        }
+
+        let mut source_address = Address::ZERO;
+        data.copy_to_slice(source_address.as_mut_slice());
+
+        let mut source_pubkey = FixedBytes::<48>::ZERO;
+        data.copy_to_slice(source_pubkey.as_mut_slice());
+
+        let mut target_pubkey = FixedBytes::<48>::ZERO;
+        data.copy_to_slice(target_pubkey.as_mut_slice());
+
+        consolidation_requests.push(Request::ConsolidationRequest(ConsolidationRequest {
+            source_address,
+            source_pubkey,
+            target_pubkey,
+        }));
+    }
+
+    Ok(consolidation_requests)
+}