nimbus-eth1/src/vm_state_transactions.nim

import
  strformat, tables,
  logging, constants, errors, computation, transaction, types, vm_state, "block", db / db_chain, utils / [state, header]

method executeTransaction(vmState: var BaseVMState, transaction: BaseTransaction): (BaseComputation, Header) =
  # Execute the transaction in the vm
  raise newException(ValueError, "Must be implemented by subclasses")


method addTransaction*(vmState: var BaseVMState, transaction: BaseTransaction, computation: BaseComputation, b: Block): (Block, Table[string, string]) =
  # Add a transaction to the given block and
  # return `trieData` to store the transaction data in chaindb in VM layer
  # Update the bloomFilter, transaction trie and receipt trie roots, bloom_filter,
  # bloom, and usedGas of the block
  # transaction: the executed transaction
  # computation: the Computation object with executed result
  # block: the Block which the transaction is added in
  # var receipt = vmState.makeReceipt(transaction, computation)
  # vmState.add_receipt(receipt)

  # block.transactions.append(transaction)

  #       # Get trie roots and changed key-values.
  #       tx_root_hash, tx_kv_nodes = make_trie_root_and_nodes(block.transactions)
  #       receipt_root_hash, receipt_kv_nodes = make_trie_root_and_nodes(self.receipts)

  #       trie_data = merge(tx_kv_nodes, receipt_kv_nodes)

  #       block.bloom_filter |= receipt.bloom

  #       block.header.transaction_root = tx_root_hash
  #       block.header.receipt_root = receipt_root_hash
  #       block.header.bloom = int(block.bloom_filter)
  #       block.header.gas_used = receipt.gas_used

  #       return block, trie_data
  result = (b, initTable[string, string]())

method applyTransaction*(
    vmState: var BaseVMState,
    transaction: BaseTransaction,
    b: Block,
    isStateless: bool): (BaseComputation, Block, Table[string, string]) =
  # Apply transaction to the given block
  # transaction: the transaction need to be applied
  # b: the block which the transaction applies on
  # isStateless: if isStateless, call vmState.addTransaction to set block
  
  if isStateless:
    var ourBlock = b # deepcopy
    vmState.blockHeader = b.header
    var (computation, blockHeader) = vmState.executeTransaction(transaction)

    ourBlock.header = blockHeader
    var trieData: Table[string, string]
    (ourBlock, trieData) = vmState.addTransaction(transaction, computation, ourBlock)

    result = (computation, ourBlock, trieData)
  else:
    var (computation, blockHeader) = vmState.executeTransaction(transaction)
    return (computation, nil, initTable[string, string]())