def configure_homestead_header(vm, **header_params): validate_header_params_for_configuration(header_params) with vm.block.header.build_changeset(**header_params) as changeset: if 'timestamp' in header_params and changeset.block_number > 0: parent_header = get_parent_header(changeset.build_rlp(), vm.chaindb) changeset.difficulty = compute_homestead_difficulty( parent_header, header_params['timestamp'], ) # In geth the modification of the state in the DAO fork block is performed # before any transactions are applied, so doing it here is the closest we # get to that. Another alternative would be to do it in Block.mine(), but # there we'd need to manually instantiate the State and update # header.state_root after we're done. if vm.support_dao_fork and changeset.block_number == vm.dao_fork_block_number: state = vm.state for account in dao_drain_list: account = decode_hex(account) balance = state.account_db.get_balance(account) state.account_db.delta_balance(dao_refund_contract, balance) state.account_db.set_balance(account, 0) # Persist the changes to the database state.account_db.persist() # Update state_root manually changeset.state_root = state.state_root header = changeset.commit() return header
def configure_frontier_header(vm: "FrontierVM", **header_params: Any) -> BlockHeader: validate_header_params_for_configuration(header_params) with vm.get_header().build_changeset(**header_params) as changeset: if 'timestamp' in header_params and vm.get_header().block_number > 0: parent_header = get_parent_header(changeset.build_rlp(), vm.chaindb) changeset.difficulty = compute_frontier_difficulty( parent_header, header_params['timestamp'], ) header = changeset.commit() return header
def configure_fhe_header(vm, **header_params): validate_header_params_for_configuration(header_params) with vm.block.header.build_changeset(**header_params) as changeset: if 'timestamp' in header_params and vm.block.header.block_number > 0: parent_header = get_parent_header(changeset.build_rlp(), vm.chaindb) changeset.difficulty = compute_fhe_difficulty( parent_header, header_params['timestamp'], ) header = changeset.commit() return header
def configure_header(difficulty_fn: Callable[[BlockHeader, int], int], vm: BaseVM, **header_params: Any) -> BlockHeader: validate_header_params_for_configuration(header_params) with vm.block.header.build_changeset(**header_params) as changeset: if 'timestamp' in header_params and changeset.block_number > 0: parent_header = get_parent_header(changeset.build_rlp(), vm.chaindb) changeset.difficulty = difficulty_fn( parent_header, header_params['timestamp'], ) header = changeset.commit() return header