def fulfill(self, contract: ContractInstance, args: dict,
res: int) -> None:
keypair = Keypair.create_from_private_key(
private_key=self.credentials["private_key"],
public_key=self.credentials["public_key"],
)
# Estimate gas fee
predicted_gas = contract.read(
keypair,
"simple_callback",
args={
"request_id": args["request_id"],
"callback_addr": args["from"],
"result": {
"Numeric": res
},
},
)
logger.debug(
f"[[bold]{self.name}[/]] Estimating gas fee: {predicted_gas.gas_consumed}"
)
# Execute call
receipt = contract.exec(
keypair,
"simple_callback",
args={
"request_id": args["request_id"],
"callback_addr": args["from"],
"result": {
"Numeric": res
},
},
gas_limit=predicted_gas.gas_consumed * 2,
)
logger.info(
f"[[bold]{self.name}[/]] Callback substrate receipt: {receipt}")
if receipt.is_succes:
# Log the callback completed events
for contract_event in receipt.contract_events:
logger.info(
f"[[bold]{self.name}[/]] Contract callback events {contract_event.name} {contract_event.docs}: {contract_event.value}"
)
else:
raise Exception(
f"[[bold]{self.name}[/]] Contract fulfill request {args} unsuccessful {receipt.error_message}"
)
# Read back the result
result = contract.read(keypair,
"oracle_results",
args={"request_id": args["request_id"]})
logger.info(
f"[[bold]{self.name}[/]] Reading the value from contract after the callback {result}",
)
def create_contract_from_address(
self,
address: str,
substrate: SubstrateInterface = None) -> ContractInstance:
"""Given the `address` return a ContractInstance of the contract using the
`self.metadata_file` metadata.
Args:
address (str): contract address to create contract from
Returns:
ContractInstance: instance of the contract on the address.
"""
if not substrate:
substrate = self.get_connection()
return ContractInstance.create_from_address(
contract_address=address,
metadata_file=self.metadata_file,
substrate=substrate,
)
)
exit()
keypair = Keypair.create_from_uri('//Alice')
# Check if contract is on chain
contract_info = substrate.query(
"Contracts",
"ContractInfoOf",
params=['5DS85d9YE5KHqoffuYpLHwL3XNjJPQKc7ftrxdqS7S282gkK'])
if contract_info:
# Create contract instance from deterministic address
contract = ContractInstance.create_from_address(
contract_address="5DS85d9YE5KHqoffuYpLHwL3XNjJPQKc7ftrxdqS7S282gkK",
metadata_file=os.path.join(os.path.dirname(__file__), 'assets',
'erc20.json'),
substrate=substrate)
else:
# Upload WASM code
code = ContractCode.create_from_contract_files(
metadata_file=os.path.join(os.path.dirname(__file__), 'assets',
'erc20.json'),
wasm_file=os.path.join(os.path.dirname(__file__), 'assets',
'erc20.wasm'),
substrate=substrate)
receipt = code.upload_wasm(keypair)
if receipt.is_succes:
keypair = Keypair.create_from_uri('//Alice')
contract_address = "5FbuqfZwkNjadtaCfhAwMb5ZQ4Bi2iF5m4AnibhAR987Jra5"
# Check if contract is on chain
contract_info = substrate.query("Contracts", "ContractInfoOf",
[contract_address])
if contract_info.value:
print(f'Found contract on chain: {contract_info.value}')
# Create contract instance from deterministic address
contract = ContractInstance.create_from_address(
contract_address=contract_address,
metadata_file=os.path.join(os.path.dirname(__file__), 'assets',
'flipper.json'),
substrate=substrate)
else:
# Upload WASM code
code = ContractCode.create_from_contract_files(
metadata_file=os.path.join(os.path.dirname(__file__), 'assets',
'flipper.json'),
wasm_file=os.path.join(os.path.dirname(__file__), 'assets',
'flipper.wasm'),
substrate=substrate)
# Deploy contract
print('Deploy contract...')
contract = code.deploy(keypair=keypair,