def apply_fixture_block_to_chain(
block_fixture: Dict[str, Any],
chain: BaseChain,
perform_validation: bool = True
) -> Tuple[BaseBlock, BaseBlock, BaseBlock]:
"""
:return: (premined_block, mined_block, rlp_encoded_mined_block)
"""
# The block to import may be in a different block-class-range than the
# chain's current one, so we use the block number specified in the
# fixture to look up the correct block class.
if 'blockHeader' in block_fixture:
block_number = block_fixture['blockHeader']['number']
block_class = chain.get_vm_class_for_block_number(
block_number).get_block_class()
else:
block_class = chain.get_vm().get_block_class()
block = rlp.decode(block_fixture['rlp'], sedes=block_class)
mined_block, _, _ = chain.import_block(
block, perform_validation=perform_validation)
rlp_encoded_mined_block = rlp.encode(mined_block, sedes=block_class)
return (block, mined_block, rlp_encoded_mined_block)
def dict_to_spoof_transaction(
chain: BaseChain, header: BlockHeader,
transaction_dict: Dict[str, Any]) -> SpoofTransaction:
"""
Convert dicts used in calls & gas estimates into a spoof transaction
"""
txn_dict = normalize_transaction_dict(transaction_dict)
sender = txn_dict.get('from', ZERO_ADDRESS)
if 'nonce' in txn_dict:
nonce = txn_dict['nonce']
else:
vm = chain.get_vm(header)
nonce = vm.state.account_db.get_nonce(sender)
gas_price = txn_dict.get('gasPrice', 0)
gas = txn_dict.get('gas', header.gas_limit)
unsigned = chain.get_vm_class(header).create_unsigned_transaction(
nonce=nonce,
gas_price=gas_price,
gas=gas,
to=txn_dict['to'],
value=txn_dict['value'],
data=txn_dict['data'],
)
return SpoofTransaction(unsigned, from_=sender)
def account_db_at_block(chain: BaseChain,
at_block: Union[str, int],
read_only: bool=True) ->BaseAccountDB:
at_header = get_header(chain, at_block)
vm = chain.get_vm(at_header)
return vm.state.account_db