Some quick fixes for Shanghai support in Fluffy (#1541)

- Remove failing on withdrawalsRoot to allow Shanghai BlockHeader.
Still need to add real checks in block header / body validation.
- Add withdrawals array to Block object for JSON-RPC API

fluffy/network/history/history_network.nim

@@ -159,8 +159,8 @@ func validateBlockHeaderBytes*(
   if header.excessDataGas.isSome:
     return err("EIP-4844 not yet implemented")
 
-  if header.withdrawalsRoot.isSome:
-    return err("Withdrawals not yet implemented")
+  # TODO: Verify timestamp with Shanghai timestamp to if isSome()
+  # TODO 2: Verify block number with merge block to check ommerhash
 
   if not (header.blockHash() == hash):
     err("Block header hash does not match")
@@ -171,6 +171,7 @@ proc validateBlockBody(
     body: BlockBodySSZ, txsRoot, ommersHash: KeccakHash):
     Result[void, string] =
   ## Validate the block body against the txRoot amd ommersHash from the header.
+  # TODO: should be checked for hash for empty uncles after merge block
   let calculatedOmmersHash = keccakHash(body.uncles.asSeq())
   if calculatedOmmersHash != ommersHash:
     return err("Invalid ommers hash")
@@ -179,6 +180,8 @@ proc validateBlockBody(
   if calculatedTxsRoot != txsRoot:
     return err("Invalid transactions root")
 
+  # TODO: Add root check for withdrawals after Shanghai
+
   ok()
 
 proc validateBlockBodyBytes*(

nimbus/rpc/rpc_types.nim

@@ -74,6 +74,7 @@ type
     baseFeePerGas*: Option[HexQuantityStr]
     transactions*: seq[JsonNode]    # list of transaction objects, or 32 Bytes transaction hashes depending on the last given parameter.
     uncles*: seq[Hash256]           # list of uncle hashes.
+    withdrawals*: seq[WithdrawalObject] # list of validator withdrawals
 
   TransactionObject* = object       # A transaction object, or null when no transaction was found:
     # Returned to user
@@ -92,6 +93,12 @@ type
     r*: HexQuantityStr                # 32 Bytes - ECDSA signature r
     s*: HexQuantityStr                # 32 Bytes - ECDSA signature s
 
+  WithdrawalObject* = object
+    index*: HexQuantityStr
+    validatorIndex*: HexQuantityStr
+    address*: EthAddress
+    amount*: HexQuantityStr
+
   FilterLog* = object
     # Returned to user
     removed*: bool                        # true when the log was removed, due to a chain reorganization. false if its a valid log.