fix: scale withdrawals amount to gwei (#371)

Author: Nashtare

trace_decoder/src/decoding.rs

@@ -30,7 +30,7 @@ use crate::{
         OtherBlockData, TrieRootHash, TxnIdx, EMPTY_ACCOUNT_BYTES_RLPED,
         ZERO_STORAGE_SLOT_VAL_RLPED,
     },
-    utils::{hash, optional_field, optional_field_hex, update_val_if_some},
+    utils::{eth_to_gwei, hash, optional_field, optional_field_hex, update_val_if_some},
 };
 
 /// Stores the result of parsing tries. Returns a [TraceParsingError] upon
@@ -563,8 +563,13 @@ impl ProcessedBlockTrace {
     fn add_withdrawals_to_txns(
         txn_ir: &mut [GenerationInputs],
         final_trie_state: &mut PartialTrieState,
-        withdrawals: Vec<(Address, U256)>,
+        mut withdrawals: Vec<(Address, U256)>,
     ) -> TraceParsingResult<()> {
+        // Scale withdrawals amounts.
+        for (_addr, amt) in withdrawals.iter_mut() {
+            *amt = eth_to_gwei(*amt)
+        }
+
         let withdrawals_with_hashed_addrs_iter = || {
             withdrawals
                 .iter()

trace_decoder/src/utils.rs

@@ -1,4 +1,4 @@
-use ethereum_types::H256;
+use ethereum_types::{H256, U256};
 use keccak_hash::keccak;
 use log::trace;
 use mpt_trie::{
@@ -8,6 +8,11 @@ use mpt_trie::{
 
 use crate::types::HashedStorageAddr;
 
+pub(crate) fn eth_to_gwei(eth: U256) -> U256 {
+    // 1 ether = 10^9 gwei.
+    eth * U256::from(10).pow(9.into())
+}
+
 pub(crate) fn hash(bytes: &[u8]) -> H256 {
     H256::from(keccak(bytes).0)
 }