feat: added Transaction conversion from consensus for rpc (#529)

closes #528

---------

Co-authored-by: Matthias Seitz <matthias.seitz@outlook.de>

Author: Soubhik-10

crates/rpc-types/src/transaction.rs

@@ -1,10 +1,10 @@
 //! Optimism specific types related to transactions.
 
-use alloy_consensus::{Transaction as _, Typed2718};
+use alloy_consensus::{Transaction as _, Typed2718, transaction::Recovered};
 use alloy_eips::{eip2930::AccessList, eip7702::SignedAuthorization};
 use alloy_primitives::{Address, B256, BlockHash, Bytes, ChainId, TxKind, U256};
 use alloy_serde::OtherFields;
-use op_alloy_consensus::OpTxEnvelope;
+use op_alloy_consensus::{OpTxEnvelope, transaction::OpTransactionInfo};
 use serde::{Deserialize, Serialize};
 
 mod request;
@@ -29,6 +29,38 @@ pub struct Transaction {
     pub deposit_receipt_version: Option<u64>,
 }
 
+impl Transaction {
+    /// Returns a rpc [`Transaction`] with a [`OpTransactionInfo`] and
+    /// [`Recovered<OpTxEnvelope>`] as input.
+    pub fn from_transaction(tx: Recovered<OpTxEnvelope>, tx_info: OpTransactionInfo) -> Self {
+        let base_fee = tx_info.inner.base_fee;
+        let effective_gas_price = if tx.is_deposit() {
+            // For deposits, we must always set the `gasPrice` field to 0 in rpc
+            // deposit tx don't have a gas price field, but serde of `Transaction` will take care of
+            // it
+            0
+        } else {
+            base_fee
+                .map(|base_fee| {
+                    tx.effective_tip_per_gas(base_fee).unwrap_or_default() + base_fee as u128
+                })
+                .unwrap_or_else(|| tx.max_fee_per_gas())
+        };
+
+        Self {
+            inner: alloy_rpc_types_eth::Transaction {
+                inner: tx,
+                block_hash: tx_info.inner.block_hash,
+                block_number: tx_info.inner.block_number,
+                transaction_index: tx_info.inner.index,
+                effective_gas_price: Some(effective_gas_price),
+            },
+            deposit_nonce: tx_info.deposit_meta.deposit_nonce,
+            deposit_receipt_version: tx_info.deposit_meta.deposit_receipt_version,
+        }
+    }
+}
+
 impl Typed2718 for Transaction {
     fn ty(&self) -> u8 {
         self.inner.ty()