Ape StarkNet

Plugins for the StarkNet Ethereum L2 networks.

Dependencies

• python3 version 3.7.2 or greater, python3-dev

Installation

via pip

You can install the latest release via pip:

pip install ape-starknet

via setuptools

You can clone the repository and use setuptools for the most up-to-date version:

git clone https://github.com/ApeWorX/ape-starknet.git
cd ape-starknet
python3 setup.py install

Quick Usage

Account Management

Accounts are used to execute transactions and sign call data. Accounts are smart contracts in Starknet.

Out of the box, ape-starknet comes with development accounts. Access them like this:

from ape import accounts

container = accounts.containers["starknet"]
owner = container.test_accounts[0]

See the section below about Testing to learn more about test accounts.

However, when using a live network, you have to deploy the accounts yourself. To deploy a new account:

ape starknet accounts create <ALIAS> --network starknet:testnet

You can deploy the same account to multiple networks.

ape starknet accounts create <ALIAS> --network starknet:mainnet

See your accounts and all of their deployment addresses:

ape starknet accounts list

shows:

Alias                      - <ALIAS>
Public key                 - 0x123444444d716666dd88882bE2e99991555DE1c7
Contract address (testnet) - 0x6b7111AA4111e5B2229c3332B66696888164440A773333143333B383333a183
Contract address (mainnet) - 0x7873113A4111e5B2229c3332B66696388163440A373333143333B3833332122

Import an existing account:

ape starknet accounts import <ALIAS> --address 0x6b7111AA4111e5B2229c3332B66696888164440A773333143333B383333a183 --network starknet:testnet

You can also import an account by key-file, including a key-file you exported from your Argent-X browser wallet:

ape starknet accounts import <ALIAS> --keyfile path/to/keyfile.json

You can also delete accounts:

ape starknet accounts delete <ALIAS> --network starknet:testnet

NOTE: You don't have to specify the network if your account is only deployed to a single network.

Auto-Sign Message

While generally bad practice, sometimes it is necessary to have unlocked keyfile accounts auto-signing messages. An example would be during testnet automated deployments. To achieve this, use the set_autosign() method available on the keyfile accounts:

import keyring
from ape import accounts

# Use keyring package to store secrets
password = keyring.get_password("starknet-testnet-automations", "ci-shared-account")
testnet_account = accounts.load("starknet-testnet-account")
testnet_account.set_autosign(True, passphrase=password)

# Won't prompt for signing or unlocking
testnet_account.sign_message([123])

Declare and Deploy Contracts

In Starknet, you can declare contract types by publishing them to the chain. This allows other contracts to create instances of them using the deploy system call.

To declare a contract using ape-starknet, do the following (in a script or console):

from ape import project, networks

provider = networks.active_provider
declaration = provider.declare(project.MyContract)
print(declaration.class_hash)

Then, you can use the class hash in a deploy system call in a factory contract:

from starkware.cairo.common.alloc import alloc
from starkware.starknet.common.syscalls import deploy
from starkware.cairo.common.cairo_builtins import HashBuiltin

@external
func deploy_my_contract{
    syscall_ptr : felt*,
    pedersen_ptr : HashBuiltin*,
    range_check_ptr,
}():
    let (current_salt) = salt.read()
    let (class_hash) = ownable_class_hash.read()
    let (calldata_ptr) = alloc()
    let (contract_address) = deploy(
        class_hash=class_hash,
        contract_address_salt=current_salt,
        constructor_calldata_size=0,
        constructor_calldata=calldata_ptr,
    )
    salt.write(value=current_salt + 1)

After deploying the factory contract, you can use it to create contract instances:

from ape import Contract, networks, project

declaration = project.provider.declare(project.MyContract)

# NOTE: Assuming you have a contract named 'ContractFactory'.
factory = project.ContractFactory.deploy(declaration.class_hash)

call_result = factory.deploy_my_contract()
contract_address = networks.starknet.decode_address(call_result)
contract = Contract(contract_address, contract_type=project.MyContract.contract_type)

You can also deploy() from the declaration receipt (which uses the legacy deploy transaction):

from ape import accounts, project

declaration = project.provider.declare(project.MyContract)
receipt = declaration.deploy(1, 2, sender=accounts.load("MyAccount"))

Otherwise, you can use the legacy deploy system which works the same as Ethereum in ape except no sender is needed:

from ape import project

contract = project.MyContract.deploy()

Contract Interaction

After you have deployed your contracts, you can begin interacting with them. deploy methods return a contract instance from which you can call methods on:

from ape import project

contract = project.MyContract.deploy()

# Interact with deployed contract
receipt = contract.my_mutable_method(123)
value = contract.my_view_method()

You can access the return data from a mutable method's receipt:

receipt = contract.my_mutable_method(123)
result = receipt.return_value

Include a sender to delegate the transaction to an account contract:

from ape import accounts

account = accounts.load("my_account")
receipt = contract.my_mutable_method(123, sender=account)

NOTE: Currently, to pass in arrays as arguments, you have to also include the array size beforehand:

receipt = contract.store_my_list(3, [1, 2, 3])

Testing

Accounts

You can use starknet-devnet accounts in your tests.

import pytest
import ape


@pytest.fixture
def devnet_accounts():
    return ape.accounts.containers["starknet"].test_accounts


@pytest.fixture
def owner(devnet_accounts):
    return devnet_accounts[0]

Additionally, any accounts deployed in the local network are not saved to disk and are ephemeral.

import pytest
import ape


@pytest.fixture(scope="session")
def ephemeral_account():
    accounts = ape.accounts.containers["starknet"]
    accounts.deploy_account("ALIAS")

    # This account only exists in the devnet and is not a key-file account.
    return accounts.load("ALIAS")

Mainnet Alpha Whitelist Deployment Token

You can deploy contracts by doing:

from ape import project

my_contract = project.MyContract.deploy()

Paying Fees

Starknet fees are currently paid in ETH, which is an ERC-20 on the Starknet chain. To check your account balance (in ETH), use the balance property on the account:

from ape import accounts

acct = accounts.load("Alias")
print(acct.balance)

If your account has a positive balance, you can begin paying fees!

To pay fees, you can either manually set the max_fee kwarg on an invoke-transaction:

receipt = contract.my_mutable_method(123, max_fee=2900000000000)

NOTE: By not setting the max_fee, it will automatically get set to the value returned from the provider estimate_gas_cost() call. You do not need to call estimate_gas_cost() explicitly.

Mainnet Alpha Whitelist Deployment Token

Currently, to deploy to Alpha-Mainnet, your contract needs to be whitelisted. You can provide your WL token in a variety of ways.

Via Python code:

from ape import project

my_contract = project.MyContract.deploy(token="MY_TOKEN")

Via an Environment Variable:

export ALPHA_MAINNET_WL_DEPLOY_TOKEN="MY_TOKEN"

Or, via the --token flag when deploying an account:

ape starknet accounts create MY_ACCOUNT --token MY_TOKEN

Development

This project is in development and should be considered a beta. Things might not be in their final state and breaking changes may occur. Comments, questions, criticisms and pull requests are welcomed.

License

This project is licensed under the Apache 2.0.