def tester():
genesis_params = PyEVMBackend._generate_genesis_params(
overrides={'gas_limit': 7 * 10**6})
pyevm_backend = PyEVMBackend(genesis_parameters=genesis_params)
pyevm_backend.reset_to_genesis(genesis_params=genesis_params,
num_accounts=10)
return EthereumTester(backend=pyevm_backend, auto_mine_transactions=True)
def _get_pyevm_test_backend() -> PyEVMBackend:
try:
# TODO: Consider packaged support of --dev mode with testerchain
from tests.constants import PYEVM_GAS_LIMIT, NUMBER_OF_ETH_TEST_ACCOUNTS
except ImportError:
raise DevelopmentInstallationRequired(importable_name='tests.constants')
# Initialize
genesis_params = PyEVMBackend._generate_genesis_params(overrides={'gas_limit': PYEVM_GAS_LIMIT})
pyevm_backend = PyEVMBackend(genesis_parameters=genesis_params)
pyevm_backend.reset_to_genesis(genesis_params=genesis_params, num_accounts=NUMBER_OF_ETH_TEST_ACCOUNTS)
return pyevm_backend
def add_provider(self,
provider: Union[IPCProvider, WebsocketProvider, HTTPProvider, EthereumTester] = None,
provider_uri: str = None,
timeout: int = None) -> None:
if not provider_uri and not provider:
raise self.NoProvider("No URI or provider instances supplied.")
if provider_uri and not provider:
uri_breakdown = urlparse(provider_uri)
# PyEVM
if uri_breakdown.scheme == 'tester':
if uri_breakdown.netloc == 'pyevm':
from nucypher.utilities.sandbox.constants import PYEVM_GAS_LIMIT, NUMBER_OF_ETH_TEST_ACCOUNTS
# Initialize
genesis_params = PyEVMBackend._generate_genesis_params(overrides={'gas_limit': PYEVM_GAS_LIMIT})
pyevm_backend = PyEVMBackend(genesis_parameters=genesis_params)
pyevm_backend.reset_to_genesis(genesis_params=genesis_params, num_accounts=NUMBER_OF_ETH_TEST_ACCOUNTS)
# Test provider entry-point
eth_tester = EthereumTester(backend=pyevm_backend, auto_mine_transactions=True)
provider = EthereumTesterProvider(ethereum_tester=eth_tester)
elif uri_breakdown.netloc == 'geth':
# TODO: Hardcoded geth - dev IPC provider - for now
provider = IPCProvider(ipc_path='/tmp/geth.ipc', timeout=timeout)
else:
raise ValueError("{} is an invalid or unsupported blockchain provider URI".format(provider_uri))
# IPC
elif uri_breakdown.scheme == 'ipc':
provider = IPCProvider(ipc_path=uri_breakdown.path, timeout=timeout)
# Websocket
elif uri_breakdown.scheme == 'ws':
provider = WebsocketProvider(endpoint_uri=provider_uri)
# HTTP
elif uri_breakdown.scheme in ('http', 'https'):
provider = HTTPProvider(endpoint_uri=provider_uri)
else:
raise self.InterfaceError("'{}' is not a supported provider protocol".format(uri_breakdown.scheme))
self.__provider = provider
def _get_tester_pyevm(provider_uri):
# https://web3py.readthedocs.io/en/latest/providers.html#httpprovider
from nucypher.utilities.sandbox.constants import PYEVM_GAS_LIMIT, NUMBER_OF_ETH_TEST_ACCOUNTS
# Initialize
genesis_params = PyEVMBackend._generate_genesis_params(
overrides={'gas_limit': PYEVM_GAS_LIMIT})
pyevm_backend = PyEVMBackend(genesis_parameters=genesis_params)
pyevm_backend.reset_to_genesis(genesis_params=genesis_params,
num_accounts=NUMBER_OF_ETH_TEST_ACCOUNTS)
# Test provider entry-point
eth_tester = EthereumTester(backend=pyevm_backend,
auto_mine_transactions=True)
provider = EthereumTesterProvider(ethereum_tester=eth_tester)
return provider
