def get_network_id():
"""
Return the ethereum network id calling the `web3.version.network` method.
:return: Network id, int
"""
return int(Web3Provider.get_web3().version.network)
def _load(contract_name):
"""Retrieve the contract instance for `contract_name` that represent the smart
contract in the keeper network.
:param contract_name: str name of the solidity keeper contract without the network name.
:return: web3.eth.Contract instance
"""
assert ContractHandler.artifacts_path is not None, 'artifacts_path should be already set.'
contract_definition = ContractHandler.get_contract_dict_by_name(
contract_name, ContractHandler.artifacts_path)
abi = contract_definition['abi']
# 用truffle存在一些问题，因此采用了暴力方案
# address = Web3.toChecksumAddress(contract_definition['address'])
if contract_name == 'CDTRegistry':
address = ContractHandler.cdt_registry_address
else:
address = ContractHandler.task_market_address
contract = Web3Provider.get_web3().eth.contract(address=address,
abi=abi)
# version = contract_definition['version']
version = 0
ContractHandler._contracts[contract_name] = (contract,
ConciseContract(contract),
version)
return ContractHandler._contracts[contract_name]
def get_tx_receipt(tx_hash):
"""
Get the receipt of a tx.
:param tx_hash: hash of the transaction
:return: Tx receipt
"""
try:
Web3Provider.get_web3().eth.waitForTransactionReceipt(tx_hash,
timeout=20)
except Timeout:
logger.info('Waiting for transaction receipt timed out.')
return
except ValueError as e:
logger.error(f'Waiting for transaction receipt failed: {e}')
return
return Web3Provider.get_web3().eth.getTransactionReceipt(tx_hash)
def get_ether_balance(address):
"""
Get balance of an ethereum address.
:param address: address, bytes32
:return: balance, int
"""
return Web3Provider.get_web3().eth.getBalance(
address, block_identifier='latest')
def unlock_account(account):
"""
Unlock the account.
:param account: Account
:return:
"""
return Web3Provider.get_web3().personal.unlockAccount(
account.address, account.password)
def sign_hash(msg_hash, account):
"""
This method use `personal_sign`for signing a message. This will always prepend the
`\x19Ethereum Signed Message:\n32` prefix before signing.
:param msg_hash:
:param account: Account
:return: signature
"""
wallet = Wallet(Web3Provider.get_web3(), account.key, account.password,
account.address)
s = wallet.sign(msg_hash)
return s.signature.hex()
def ec_recover(message, signed_message):
"""
This method does not prepend the message with the prefix `\x19Ethereum Signed Message:\n32`.
The caller should add the prefix to the msg/hash before calling this if the signature was
produced for an ethereum-prefixed message.
:param message:
:param signed_message:
:return:
"""
w3 = Web3Provider.get_web3()
v, r, s = split_signature(w3, w3.toBytes(hexstr=signed_message))
signature_object = SignatureFix(vrs=(v, big_endian_to_int(r),
big_endian_to_int(s)))
return w3.eth.account.recoverHash(
message, signature=signature_object.to_hex_v_hacked())
def process_tx_receipt(tx_hash, event_instance, event_name, agreement_id=None):
"""
Wait until the tx receipt is processed.
:param tx_hash: hash of the transaction
:param event_instance: instance of ContractEvent
:param event_name: name of the event to subscribe, str
:param agreement_id: hex str
:return:
"""
if not isinstance(tx_hash, bytes):
raise TypeError(f'first argument should be bytes type, '
f'got type {type(tx_hash)} and value {tx_hash}')
if not isinstance(event_instance, ContractEvent):
raise TypeError(f'second argument should be a ContractEvent, '
f'got {event_instance} of type {type(event_instance)}')
web3 = Web3Provider.get_web3()
try:
web3.eth.waitForTransactionReceipt(tx_hash, timeout=20)
except Timeout:
logger.info(f'Waiting for {event_name} transaction receipt timed out. '
f'Cannot verify receipt and event.')
return False
receipt = web3.eth.getTransactionReceipt(tx_hash)
event_logs = event_instance.processReceipt(receipt) if receipt else None
if event_logs:
logger.info(
f'Success: got {event_name} event after fulfilling condition.')
logger.debug(
f'Success: got {event_name} event after fulfilling condition. {receipt}, '
f'::: {event_logs}')
else:
logger.debug(
f'Something is not right, cannot find the {event_name} event after calling the'
f' fulfillment condition. This is the transaction receipt {receipt}'
)
if receipt and receipt.status == 0:
logger.warning(
f'Transaction failed: tx_hash {tx_hash.hex()}, tx event {event_name}, receipt '
f'{receipt}, id {agreement_id}')
return False
return True
def __init__(self, contract_names=None):
self.network_name = Keeper.get_network_name(Keeper.get_network_id())
self.accounts = Web3Provider.get_web3().eth.accounts
self._contract_name_to_instance = {}
if contract_names:
for name in contract_names:
try:
contract = GenericContract(name)
self._contract_name_to_instance[name] = contract
setattr(self, name, contract)
except (KeyError, Exception):
pass
self.cdt_registry = CDTRegistry.get_instance()
self.task_market = TaskMarket.get_instance()
contracts = [self.cdt_registry, self.task_market]
self._contract_name_to_instance.update(
{contract.name: contract
for contract in contracts if contract})
print('Importing environment from .env...')
for line in open('.env'):
var = line.strip().split('=')
if len(var) == 2:
key, value = var[0].strip(), var[1].strip()
os.environ[key] = value
if __name__ == "__main__":
# 合约地址、abi路径设置
import_env()
artifacts_path = os.getenv('ARTIFACTS_PATH')
cdt_registry_address = os.getenv('CDT_REGISTRY_ADDRESS')
task_market_address = os.getenv('TASK_MARKET_ADDRESS')
Web3Provider.init_web3('http://localhost:8545')
ContractHandler.set_artifacts_path(os.path.expanduser(artifacts_path))
ContractHandler.set_contract_address(cdt_registry_address,
task_market_address)
keeper = Keeper.get_instance()
# 通过环境变量获取三个以太坊账户, ganache-cli的第一个账户为合约部署的系统账户
account1 = get_account(0)
account2 = get_account(1)
account3 = get_account(2)
system_account = account1
# 下面以两家企业的联合建模为例，第三方科技公司提供模型并发起任务
# data_provider1在企业1的私域，将数据秘密共享后传给企业1、2的联邦域computa_provider1、2
ipfs_client = IPFSProvider()
system_provider = SystemProvider(keeper, system_account)