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Description:

gnosispysovryn 3.2.5

Gnosis-py includes a set of libraries to work with Ethereum and Gnosis projects:

EthereumClient, a wrapper over Web3.py Web3 client including utilities to deal with ERC20/721
tokens and tracing.
Gnosis Safe classes and utilities.
Price oracles for Uniswap, Kyber…
Django serializers, models and utils.

Quick start
Just run pip install gnosis-py or add it to your requirements.txt
If you want django ethereum utils (models, serializers, filters…) you need to run
pip install gnosis-py[django]
If you have issues building coincurve maybe
you are missing some libraries

Ethereum utils

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.
generate_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.

Ethereum django (REST) utils
Django utils are available under gnosis.eth.django.
You can find a set of helpers for working with Ethereum using Django and Django Rest framework.
It includes:

gnosis.eth.django.filters: EthereumAddressFilter.
gnosis.eth.django.models: Model fields (Ethereum address, Ethereum big integer field).
gnosis.eth.django.serializers: Serializer fields (Ethereum address field, hexadecimal field).
gnosis.eth.django.validators: Ethereum related validators.
gnosis.safe.serializers: Serializers for Gnosis Safe (signature, transaction…).
All the tests are written using Django Test suite.

Contributors

Denís Graña (denis@gnosis.pm)
Giacomo Licari (giacomo.licari@gnosis.pm)
Uxío Fuentefría (uxio@gnosis.pm)