fix eip2718 bug

- fixes bug in rlp decoder of Receipt
- fixes bug in rlp decoder of Transaction
- refactor rlpEncode for AccessListTx in eth/common/transaction.nim

eth/common/eth_types.nim

@@ -369,7 +369,10 @@ proc read*(rlp: var Rlp, T: type Transaction): T =
   else:
     let bytes = rlp.read(Blob)
     var rr = rlpFromBytes(bytes)
-    assert(rr.read(int) == 1)
+    let txType = rr.read(int)
+    if txType != 1:
+      raise newException(UnsupportedRlpError,
+        "TxType expect 1 got " & $txType)
     result = Transaction(
       txType: AccessListTxType,
       accessListTx: rr.read(AccessListTx)
@@ -427,7 +430,10 @@ proc read*(rlp: var Rlp, T: type Receipt): T =
   else:
     let bytes = rlp.read(Blob)
     var rr = rlpFromBytes(bytes)
-    assert(rr.read(int) == 1)
+    let recType = rr.read(int)
+    if recType != 1:
+      raise newException(UnsupportedRlpError,
+        "TxType expect 1 got " & $recType)
     result = Receipt(
       receiptType: AccessListReceiptType,
       accessListReceipt: rr.read(AccessListReceipt)

eth/common/transaction.nim

@@ -87,11 +87,7 @@ func rlpEncodeEIP155*(tx: LegacyTx): auto =
     S: 0.u256
     ))
 
-func txHashNoSignature*(tx: LegacyTx): Hash256 =
+func rlpEncode*(tx: AccessListTx): auto =
-  # Hash transaction without signature
-  return keccak256.digest(if tx.V >= EIP155_CHAIN_ID_OFFSET: tx.rlpEncodeEIP155 else: tx.rlpEncode)
-
-func txHashNoSignature*(tx: AccessListTx): Hash256 =
   let unsignedTx = AccessListUnsignedTx(
     chainId: tx.chainId,
     nonce: tx.nonce,
@@ -106,8 +102,14 @@ func txHashNoSignature*(tx: AccessListTx): Hash256 =
   var rw = initRlpWriter()
   rw.append(1)
   rw.append(unsignedTx)
-  let rlpBytes = rlp.encode(rw.finish())
+  rlp.encode(rw.finish())
-  return keccak256.digest(rlpBytes)
+
+func txHashNoSignature*(tx: LegacyTx): Hash256 =
+  # Hash transaction without signature
+  keccak256.digest(if tx.V >= EIP155_CHAIN_ID_OFFSET: tx.rlpEncodeEIP155 else: tx.rlpEncode)
+
+func txHashNoSignature*(tx: AccessListTx): Hash256 =
+  keccak256.digest(tx.rlpEncode)
 
 func txHashNoSignature*(tx: Transaction): Hash256 =
   if tx.txType == LegacyTxType: