gnosis.eth

• class EthereumClient (ethereum_node_url: str): Class to connect and do operations with a ethereum node. Uses web3 and raw rpc calls for things not supported in web3. Only http/https urls are suppored for the node url.

EthereumClient has some utils that improve a lot performance using Ethereum nodes, like the possibility of doing batch_calls (a single request making read-only calls to multiple contracts):

from gnosis.eth import EthereumClient
from gnosis.eth.contracts import get_erc721_contract
ethereum_client = EthereumClient(ETHEREUM_NODE_URL)
erc721_contract = get_erc721_contract(self.w3, token_address)
name, symbol = ethereum_client.batch_call([
                    erc721_contract.functions.name(),
                    erc721_contract.functions.symbol(),
                ])

If you want to use the underlying web3.py library:

from gnosis.eth import EthereumClient
ethereum_client = EthereumClient(ETHEREUM_NODE_URL)
ethereum_client.w3.eth.get_block(57)

gnosis.eth.constants

• NULL_ADDRESS (0x000...0): Solidity address(0).

• SENTINEL_ADDRESS (0x000...1): Used for Gnosis Safe’s linked lists (modules, owners…).

• Maximum an minimum values for R, S and V in ethereum signatures.

gnosis.eth.oracles

Price oracles for Uniswap, UniswapV2, Kyber, SushiSwap, Aave, Balancer, Curve, Mooniswap, Yearn… Example:

from gnosis.eth import EthereumClient
from gnosis.eth.oracles import UniswapV2Oracle
ethereum_client = EthereumClient(ETHEREUM_NODE_URL)
uniswap_oracle = UniswapV2Oracle(ethereum_client)
gno_token_mainnet_address = '0x6810e776880C02933D47DB1b9fc05908e5386b96'
weth_token_mainnet_address = '0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2'
price = uniswap_oracle.get_price(gno_token_mainnet_address, uniswap_oracle.weth_address)

gnosis.eth.utils

Contains utils for ethereum operations:

• get_eth_address_with_key() -> Tuple[str, bytes]: Returns a tuple of a valid public ethereum checksumed address with the private key.

• mk_contract_address_2(from_: Union[str, bytes], salt: Union[str, bytes], init_code: [str, bytes]) -> str: Calculates the address of a new contract created using the new CREATE2 opcode.