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contract.py
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contract.py
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import copy
from typing import (
TYPE_CHECKING,
Any,
Callable,
Dict,
Iterable,
List,
Optional,
Sequence,
Type,
cast,
)
from eth_typing import (
ABI,
ChecksumAddress,
)
from eth_utils import (
combomethod,
get_abi_input_names,
get_all_function_abis,
)
from eth_utils.toolz import (
partial,
)
from hexbytes import (
HexBytes,
)
from web3._utils.abi import (
fallback_func_abi_exists,
receive_func_abi_exists,
)
from web3._utils.abi_element_identifiers import (
FallbackFn,
ReceiveFn,
)
from web3._utils.compat import (
Self,
)
from web3._utils.contracts import (
parse_block_identifier,
)
from web3._utils.datatypes import (
PropertyCheckingFactory,
)
from web3._utils.events import (
EventFilterBuilder,
get_event_data,
)
from web3._utils.filters import (
LogFilter,
)
from web3._utils.normalizers import (
normalize_abi,
normalize_address,
normalize_bytecode,
)
from web3._utils.transactions import (
fill_transaction_defaults,
)
from web3.contract.base_contract import (
BaseContract,
BaseContractCaller,
BaseContractConstructor,
BaseContractEvent,
BaseContractEvents,
BaseContractFunction,
BaseContractFunctions,
NonExistentFallbackFunction,
NonExistentReceiveFunction,
)
from web3.contract.utils import (
build_transaction_for_function,
call_contract_function,
estimate_gas_for_function,
find_functions_by_identifier,
get_function_by_identifier,
transact_with_contract_function,
)
from web3.exceptions import (
ABIFunctionNotFound,
NoABIFound,
NoABIFunctionsFound,
Web3AttributeError,
Web3TypeError,
Web3ValidationError,
Web3ValueError,
)
from web3.types import (
BlockIdentifier,
EventData,
StateOverride,
TxParams,
)
if TYPE_CHECKING:
from ens import ENS # noqa: F401
from web3 import Web3 # noqa: F401
class ContractEvent(BaseContractEvent):
# mypy types
w3: "Web3"
@combomethod
def get_logs(
self,
argument_filters: Optional[Dict[str, Any]] = None,
from_block: Optional[BlockIdentifier] = None,
to_block: Optional[BlockIdentifier] = None,
block_hash: Optional[HexBytes] = None,
) -> Iterable[EventData]:
"""
Get events for this contract instance using eth_getLogs API.
This is a stateless method, as opposed to create_filter.
It can be safely called against nodes which do not provide
eth_newFilter API, like Infura nodes.
If there are many events,
like ``Transfer`` events for a popular token,
the Ethereum node might be overloaded and timeout
on the underlying JSON-RPC call.
Example - how to get all ERC-20 token transactions
for the latest 10 blocks:
.. code-block:: python
from = max(my_contract.web3.eth.block_number - 10, 1)
to = my_contract.web3.eth.block_number
events = my_contract.events.Transfer.get_logs(from_block=from, to_block=to)
for e in events:
print(e["args"]["from"],
e["args"]["to"],
e["args"]["value"])
The returned processed log values will look like:
.. code-block:: python
(
AttributeDict({
'args': AttributeDict({}),
'event': 'LogNoArguments',
'logIndex': 0,
'transactionIndex': 0,
'transactionHash': HexBytes('...'),
'address': '0xF2E246BB76DF876Cef8b38ae84130F4F55De395b',
'blockHash': HexBytes('...'),
'blockNumber': 3
}),
AttributeDict(...),
...
)
See also: :func:`web3.middleware.filter.LocalFilterMiddleware`.
:param argument_filters: Filter by argument values. Indexed arguments are
filtered by the node while non-indexed arguments are filtered by the library.
:param from_block: block number or "latest", defaults to "latest"
:param to_block: block number or "latest". Defaults to "latest"
:param block_hash: block hash. block_hash cannot be set at the
same time as ``from_block`` or ``to_block``
:yield: Tuple of :class:`AttributeDict` instances
"""
event_abi = self._get_event_abi()
# validate ``argument_filters`` if present
if argument_filters is not None:
event_arg_names = get_abi_input_names(event_abi)
if not all(arg in event_arg_names for arg in argument_filters.keys()):
raise Web3ValidationError(
"When filtering by argument names, all argument names must be "
"present in the contract's event ABI."
)
_filter_params = self._get_event_filter_params(
event_abi, argument_filters, from_block, to_block, block_hash
)
# call JSON-RPC API
logs = self.w3.eth.get_logs(_filter_params)
# convert raw binary data to Python proxy objects as described by ABI:
all_event_logs = tuple(
get_event_data(self.w3.codec, event_abi, entry) for entry in logs
)
filtered_logs = self._process_get_logs_argument_filters(
event_abi,
all_event_logs,
argument_filters,
)
sorted_logs = sorted(filtered_logs, key=lambda e: e["logIndex"])
sorted_logs = sorted(sorted_logs, key=lambda e: e["blockNumber"])
return sorted_logs
@combomethod
def create_filter(
self,
*, # PEP 3102
argument_filters: Optional[Dict[str, Any]] = None,
from_block: Optional[BlockIdentifier] = None,
to_block: BlockIdentifier = "latest",
address: Optional[ChecksumAddress] = None,
topics: Optional[Sequence[Any]] = None,
) -> LogFilter:
"""
Create filter object that tracks logs emitted by this contract event.
"""
filter_builder = EventFilterBuilder(self._get_event_abi(), self.w3.codec)
self._set_up_filter_builder(
argument_filters,
from_block,
to_block,
address,
topics,
filter_builder,
)
log_filter = filter_builder.deploy(self.w3)
log_filter.log_entry_formatter = get_event_data(
self.w3.codec, self._get_event_abi()
)
log_filter.builder = filter_builder
return log_filter
@combomethod
def build_filter(self) -> EventFilterBuilder:
builder = EventFilterBuilder(
self._get_event_abi(),
self.w3.codec,
formatter=get_event_data(self.w3.codec, self._get_event_abi()),
)
builder.address = self.address
return builder
class ContractEvents(BaseContractEvents):
def __init__(
self, abi: ABI, w3: "Web3", address: Optional[ChecksumAddress] = None
) -> None:
super().__init__(abi, w3, ContractEvent, address)
class ContractFunction(BaseContractFunction):
# mypy types
w3: "Web3"
def __call__(self, *args: Any, **kwargs: Any) -> "ContractFunction":
clone = copy.copy(self)
if args is None:
clone.args = tuple()
else:
clone.args = args
if kwargs is None:
clone.kwargs = {}
else:
clone.kwargs = kwargs
clone._set_function_info()
return clone
@classmethod
def factory(cls, class_name: str, **kwargs: Any) -> Self:
return PropertyCheckingFactory(class_name, (cls,), kwargs)(kwargs.get("abi"))
def call(
self,
transaction: Optional[TxParams] = None,
block_identifier: BlockIdentifier = None,
state_override: Optional[StateOverride] = None,
ccip_read_enabled: Optional[bool] = None,
) -> Any:
"""
Execute a contract function call using the `eth_call` interface.
This method prepares a ``Caller`` object that exposes the contract
functions and public variables as callable Python functions.
Reading a public ``owner`` address variable example:
.. code-block:: python
ContractFactory = w3.eth.contract(
abi=wallet_contract_definition["abi"]
)
# Not a real contract address
contract = ContractFactory("0x2f70d3d26829e412A602E83FE8EeBF80255AEeA5")
# Read "owner" public variable
addr = contract.functions.owner().call()
:param transaction: Dictionary of transaction info for web3 interface
:param block_identifier: TODO
:param state_override TODO
:param ccip_read_enabled TODO
:return: ``Caller`` object that has contract public functions
and variables exposed as Python methods
"""
call_transaction = self._get_call_txparams(transaction)
block_id = parse_block_identifier(self.w3, block_identifier)
return call_contract_function(
self.w3,
self.address,
self._return_data_normalizers,
self.abi_element_identifier,
call_transaction,
block_id,
self.contract_abi,
self.abi,
state_override,
ccip_read_enabled,
self.decode_tuples,
*self.args,
**self.kwargs,
)
def transact(self, transaction: Optional[TxParams] = None) -> HexBytes:
setup_transaction = self._transact(transaction)
return transact_with_contract_function(
self.address,
self.w3,
self.abi_element_identifier,
setup_transaction,
self.contract_abi,
self.abi,
*self.args,
**self.kwargs,
)
def estimate_gas(
self,
transaction: Optional[TxParams] = None,
block_identifier: Optional[BlockIdentifier] = None,
state_override: Optional[StateOverride] = None,
) -> int:
setup_transaction = self._estimate_gas(transaction)
return estimate_gas_for_function(
self.address,
self.w3,
self.abi_element_identifier,
setup_transaction,
self.contract_abi,
self.abi,
block_identifier,
state_override,
*self.args,
**self.kwargs,
)
def build_transaction(self, transaction: Optional[TxParams] = None) -> TxParams:
built_transaction = self._build_transaction(transaction)
return build_transaction_for_function(
self.address,
self.w3,
self.abi_element_identifier,
built_transaction,
self.contract_abi,
self.abi,
*self.args,
**self.kwargs,
)
@staticmethod
def get_fallback_function(
abi: ABI,
w3: "Web3",
address: Optional[ChecksumAddress] = None,
) -> "ContractFunction":
if abi and fallback_func_abi_exists(abi):
return ContractFunction.factory(
"fallback",
w3=w3,
contract_abi=abi,
address=address,
abi_element_identifier=FallbackFn,
)()
return cast(ContractFunction, NonExistentFallbackFunction())
@staticmethod
def get_receive_function(
abi: ABI,
w3: "Web3",
address: Optional[ChecksumAddress] = None,
) -> "ContractFunction":
if abi and receive_func_abi_exists(abi):
return ContractFunction.factory(
"receive",
w3=w3,
contract_abi=abi,
address=address,
abi_element_identifier=ReceiveFn,
)()
return cast(ContractFunction, NonExistentReceiveFunction())
class ContractFunctions(BaseContractFunctions):
def __init__(
self,
abi: ABI,
w3: "Web3",
address: Optional[ChecksumAddress] = None,
decode_tuples: Optional[bool] = False,
) -> None:
super().__init__(abi, w3, ContractFunction, address, decode_tuples)
def __getattr__(self, function_name: str) -> "ContractFunction":
if self.abi is None:
raise NoABIFound(
"There is no ABI found for this contract.",
)
if "_functions" not in self.__dict__:
raise NoABIFunctionsFound(
"The abi for this contract contains no function definitions. ",
"Are you sure you provided the correct contract abi?",
)
elif function_name not in self.__dict__["_functions"]:
raise ABIFunctionNotFound(
f"The function '{function_name}' was not found in this contract's abi.",
" Are you sure you provided the correct contract abi?",
)
else:
return super().__getattribute__(function_name)
class Contract(BaseContract):
# mypy types
w3: "Web3"
functions: ContractFunctions = None
caller: "ContractCaller" = None
# Instance of :class:`ContractEvents` presenting available Event ABIs
events: ContractEvents = None
def __init__(self, address: Optional[ChecksumAddress] = None) -> None:
"""
Create a new smart contract proxy object.
:param address: Contract address as 0x hex string
"""
_w3 = self.w3
if _w3 is None:
raise Web3AttributeError(
"The `Contract` class has not been initialized. Please use the "
"`web3.contract` interface to create your contract class."
)
if address:
self.address = normalize_address(cast("ENS", _w3.ens), address)
if not self.address:
raise Web3TypeError(
"The address argument is required to instantiate a contract."
)
self.functions = ContractFunctions(
self.abi, _w3, self.address, decode_tuples=self.decode_tuples
)
self.caller = ContractCaller(
self.abi, _w3, self.address, decode_tuples=self.decode_tuples
)
self.events = ContractEvents(self.abi, _w3, self.address)
self.fallback = Contract.get_fallback_function(
self.abi,
_w3,
ContractFunction,
self.address,
)
self.receive = Contract.get_receive_function(
self.abi,
_w3,
ContractFunction,
self.address,
)
@classmethod
def factory(
cls, w3: "Web3", class_name: Optional[str] = None, **kwargs: Any
) -> Type[Self]:
kwargs["w3"] = w3
normalizers = {
"abi": normalize_abi,
"address": partial(normalize_address, w3.ens),
"bytecode": normalize_bytecode,
"bytecode_runtime": normalize_bytecode,
}
contract = cast(
Type[Self],
PropertyCheckingFactory(
class_name or cls.__name__,
(cls,),
kwargs,
normalizers=normalizers,
),
)
contract.functions = ContractFunctions(
contract.abi, contract.w3, decode_tuples=contract.decode_tuples
)
contract.caller = ContractCaller(
contract.abi,
contract.w3,
contract.address,
decode_tuples=contract.decode_tuples,
)
contract.events = ContractEvents(contract.abi, contract.w3)
contract.fallback = Contract.get_fallback_function(
contract.abi,
contract.w3,
ContractFunction,
)
contract.receive = Contract.get_receive_function(
contract.abi,
contract.w3,
ContractFunction,
)
return contract
@classmethod
def constructor(cls, *args: Any, **kwargs: Any) -> "ContractConstructor":
"""
:param args: The contract constructor arguments as positional arguments
:param kwargs: The contract constructor arguments as keyword arguments
:return: a contract constructor object
"""
if cls.bytecode is None:
raise Web3ValueError(
"Cannot call constructor on a contract that does not have "
"'bytecode' associated with it"
)
return ContractConstructor(cls.w3, cls.abi, cls.bytecode, *args, **kwargs)
@combomethod
def find_functions_by_identifier(
cls,
contract_abi: ABI,
w3: "Web3",
address: ChecksumAddress,
callable_check: Callable[..., Any],
) -> List["ContractFunction"]:
return cast(
List["ContractFunction"],
find_functions_by_identifier(
contract_abi, w3, address, callable_check, ContractFunction
),
)
@combomethod
def get_function_by_identifier(
cls, fns: Sequence["ContractFunction"], identifier: str
) -> "ContractFunction":
return get_function_by_identifier(fns, identifier)
class ContractCaller(BaseContractCaller):
# mypy types
w3: "Web3"
def __init__(
self,
abi: ABI,
w3: "Web3",
address: ChecksumAddress,
transaction: Optional[TxParams] = None,
block_identifier: BlockIdentifier = None,
ccip_read_enabled: Optional[bool] = None,
decode_tuples: Optional[bool] = False,
) -> None:
super().__init__(abi, w3, address, decode_tuples=decode_tuples)
if self.abi:
if transaction is None:
transaction = {}
self._functions = get_all_function_abis(self.abi)
for func in self._functions:
fn = ContractFunction.factory(
func["name"],
w3=w3,
contract_abi=self.abi,
address=self.address,
abi_element_identifier=func["name"],
decode_tuples=decode_tuples,
)
caller_method = partial(
self.call_function,
fn,
transaction=transaction,
block_identifier=block_identifier,
ccip_read_enabled=ccip_read_enabled,
)
setattr(self, func["name"], caller_method)
def __call__(
self,
transaction: Optional[TxParams] = None,
block_identifier: BlockIdentifier = None,
ccip_read_enabled: Optional[bool] = None,
) -> "ContractCaller":
if transaction is None:
transaction = {}
return type(self)(
self.abi,
self.w3,
self.address,
transaction=transaction,
block_identifier=block_identifier,
ccip_read_enabled=ccip_read_enabled,
decode_tuples=self.decode_tuples,
)
class ContractConstructor(BaseContractConstructor):
# mypy types
w3: "Web3"
@combomethod
def transact(self, transaction: Optional[TxParams] = None) -> HexBytes:
return self.w3.eth.send_transaction(self._get_transaction(transaction))
@combomethod
def build_transaction(self, transaction: Optional[TxParams] = None) -> TxParams:
"""
Build the transaction dictionary without sending
"""
built_transaction = self._build_transaction(transaction)
return fill_transaction_defaults(self.w3, built_transaction)
@combomethod
def estimate_gas(
self,
transaction: Optional[TxParams] = None,
block_identifier: Optional[BlockIdentifier] = None,
) -> int:
transaction = self._estimate_gas(transaction)
return self.w3.eth.estimate_gas(transaction, block_identifier=block_identifier)