Questions tagged [brownie]
Brownie is a Python-based development and testing framework for smart contracts targeting the Ethereum Virtual Machine.
387
questions
1
vote
1
answer
64
views
How to handle two solidity events with asyncio python
Im trying to get every Swap event happens on Uniswap and Sushiswap using python and do stuff based on these Swaps i know how to do it but with one exchange, it means that only one event in time .
from ...
- 298
0
votes
1
answer
340
views
UniswapV2Router02 swapExactTokensForTokens deadline
im trying to swap some DAI with USDC Using UniswapV2Router02 function swapExactTokensForTokens() with brownie and python by unlocking a DAI token holder account and im getting this error :
...
- 298
2
votes
1
answer
99
views
How to dump/access contract storage in Brownie console?
In Brownie console, for a deployed contract, public contract attributes can be accessed with contract.nameOfAttribute(). This does not work for private attributes - how can one access private ...
- 31
0
votes
1
answer
87
views
Accessing private data on a blockchain address using Brownie
I'm trying to practice on the private data exploit on ethereum and was wondering if there is a function like web3.eth.getStorageAt() implemented in brownie which would allow me to access the storage ...
- 17
0
votes
0
answers
261
views
Flashloan with DyDx on mainnet-fork
I forked the Ethereum mainnet with the ganache-cli using this command below :
ganache-cli -f https://eth-mainnet.g.alchemy.com/v2/GsxpURWipc2UTubeBm3Mf-WdEyioVdwV -u ...
- 298
0
votes
0
answers
84
views
error: "VirtualMachineError: revert"
I am watching free codecamp's blockchain course by PatrickAlphaC. In the lottery lesson I have this problem:
in the lottery.sol file I use AggregatorV3Interface to get eth/usd price and use it to ...
0
votes
2
answers
339
views
ImportError: cannot import name 'LinkToken' from 'brownie'
I am working with the tutorial by freecodecamp.org and have the following error: ImportError: cannot import name 'LinkToken' from 'brownie
It is also not able to import VRFCoordinatorMock which I am ...
0
votes
2
answers
181
views
Development Network - Multiple Transactions Same Block - Brownie
I'm trying to setup a test, where multiple transactions interacting with a contract are mined in the same block (from different accounts). However, the default behavior is to mine a block at each ...
0
votes
0
answers
34
views
eth-brownie: swapAVAXForExactTokens fail to perform a basic swap
I wrote a simple python program whose aim is to swap the native token of the underlying chain, e.g., ETH, AVAX, for other tokens.
In this case, my account holds 5+ AVAX and I am trying to do the ...
0
votes
0
answers
72
views
How do we get to know the gas fee of a transaction on Ethereum Blockchain with Brownie
I was recently searching for a way using which I can calculate the gas fee for a transaction in Brownie Ethereum development environment.
- 1
0
votes
1
answer
77
views
Can't seem to filter uniswap transactions?
The following code doesn't print any transactions. What am I missing?
def main():
uni_v3_router = Web3.toChecksumAddress('0x68b3465833fb72a70ecdf485e0e4c7bd8665fc45')
event_filter = w3.eth.filter({...
- 135
0
votes
1
answer
60
views
See Balances on mainnet-fork?
I'm currently watching my first smart contracts tutorial by freecodecamp and it works fine but, I have one question:
How can I check the balance of my mainnet-fork account(s)? When I work with Rinkeby ...
0
votes
0
answers
12
views
can we use brownie and solidity together, like for framework brownie and for smart contract solidity
I have to create an application using blockchain so while deciding on the tool I got this doubt
0
votes
0
answers
14
views
How to utilize brownie given-strategy testing function. As the website coding specs, it throws error
Here is my example code, but the pytest.mark.parametrize works well.
And the given strategy emits error hereinafter.
- 1
0
votes
2
answers
59
views
How to link deployed library to contract in brownie?
As far as I know, brownie automatically links the library to contract. Is there a way to do this manually?
I have bunch of contracts in different projects where some use library and some don't. So I ...
- 1,434
1
vote
1
answer
181
views
How to calculate AAVE yield on chain
I’m working on a project which involves tracking and withdrawing AAVE yield on chain while maintaining the original deposit balance. I’m confused as to how to accurately calculate AAVE yield at a ...
- 13
0
votes
1
answer
84
views
Withdrawn ETH gets sent as internal transaction to black hole address
I'm trying to withdraw from this contract after funding it. After funding it, i checked the balance on goerli etherscan and there was goerliETH in it that i sent but i noticed that once i called ...
0
votes
1
answer
142
views
Adding subscription address to chainlink vrf v2 inside of the contract
So I'm writing this lottery smart contract which is pretty straight forward, and since I want to test this on the goerli test net, I want to be able to add the contract as a subscriber to my VRF every ...
- 17
0
votes
1
answer
55
views
Why does my transaction reverts when funding a VRFCoordinatorV2 subscription locally?
I've been following the documentation on docs.chain.link: https://docs.chain.link/docs/vrf/v2/examples/programmatic-subscription/
in order to have a programmatic way to handle a subscription. To fund ...
0
votes
1
answer
653
views
Gas estimation failed: execution reverted on goerli with brownie
I'm trying to test an onlyOwner function on goerli testnet which's expected to be passed with pytest.raises(exceptions.VirtualMachineError) but it keeps getting below error. I added priority_fee and ...
- 11
0
votes
0
answers
78
views
Brownie Eth - Changing networks does not change the network.chain.id
I am trying to programatically deploy a Smart Contract via Brownie to multiple test networks.
The following code works, however when I switch networks the network.chain.id renames the same as the ...
0
votes
0
answers
54
views
Forking a Mainnet is showing `Unable to launch local RPC client` error
while running the command brownie console --network mainnet-fork I am getting the following error:
RPCProcessError: Unable to launch local RPC client.
Command: ganache-cli
URI: http://127.0.0.1:8545
...
- 45
0
votes
0
answers
119
views
Decode input data using Python Brownie
I'm trying to decode the input data from this transaction (https://etherscan.io/tx/0x7dc7cfbc3e4eebdcbc766fa9b34923fbca20d1ad9615ceeb69337bc627dbffd4) using Brownie.
What I did so far:
tx_hash='...
- 5
1
vote
2
answers
404
views
How to do `abi.encodeWithSignature` in Python and eth-brownie
I want to encode data using abi.encodeWithSignature in Python, and send the output from this into a contract function parameter. Now the problem is I can't figure out how should I do it.
The function ...
- 45
0
votes
0
answers
69
views
How To Make Delegate Call in eth-brownie
I want to make a delegate call in eth-brownie and encode the data using abi.encodeWithSignature but I am not able to figure out a way to do it. There is a proxy contract and implementation contract. ...
- 45
0
votes
0
answers
23
views
I am able to compile my solidity file in brownie, but while deploying, it is generating the following error: Please help. Thanks in advance
Launching 'ganache-cli.cmd --chain.vmErrorsOnRPCResponse true --wallet.totalAccounts 10 --hardfork istanbul --miner.blockGasLimit 12000000 --wallet.mnemonic brownie --server.port 8545'...
File "...
0
votes
0
answers
82
views
How to send Ether to a payable function in Brownie
I have a payable external function with parameter and I want to call this function in brownie and send some ether. How should call it in brownie? The function is given below:
function air(address ...
- 45
0
votes
0
answers
235
views
Contract verification fails with standard-json-input having linked libraries
I have a simple library and contract using that library as follows:
CNTestLib.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;
library CNTestLib {
function doStuff() public {
}
}
...
- 1
1
vote
0
answers
21
views
ValueError(f"Dotenv specified in config but not found at path: {env_path}")
I am trying to run this contract but I get the following error:
(base) elly@elly-Lenovo-G50-80:~/demos/web3_py_simple_storage/brownie_fund_me$ brownie run scripts/deploy.py
Brownie v1.19.1 - Python ...
- 13
0
votes
1
answer
109
views
TypeError: string indices must be integers
Hello there I'm currently following this tutorial https://www.youtube.com/watch?v=M576WGiDBdQ by Patrick Collins. I have a problem when I try to deploy the script:
(base) elly@elly-Lenovo-G50-80:~/...
- 13
0
votes
0
answers
30
views
GCP VM startup script cannot install brownie
I am trying to install brownie on a GCP VM instance running ubuntu 18.04 LTS minimal.
My startup script is the following:
apt-get update -y &&
apt-get upgrade -y &&
apt-get install ...
- 171
1
vote
1
answer
124
views
Encode tuple with brownie
I am trying to encode a struct as bytes with brownie and then pass the bytes as an argument to a smart contract.
contract C {
struct S {
uint256 a;
uint256 b;
}
function f(bytes memory ...
- 13
0
votes
0
answers
64
views
How do I access the public variables of a contract that is initialized in another contract in brownie test
Basically I have two contracts and one test file. Contract A is initialized in Contract B. Now I want to access the public variable of Contract A through the deployed Contract B in Brownie. The ...
- 45
1
vote
0
answers
61
views
Eth-brownie related problem- Error trying to deploy a contract
I’ve run into the following error while deploying a script. The script runs fine until the encode_and_supply function is called.
File "brownie/_cli/run.py", line 51, in main
...
- 11
0
votes
0
answers
176
views
brownie.exceptions.RPCRequestError: Encountered a ReadTimeout while requesting `debug_traceTransaction`. The local RPC client has likely crashed
I am testing a contract that requires interaction with other contracts, after writing the contracts and deploying when I send the initial transaction it successfully sends the transaction but the test ...
- 1
1
vote
0
answers
55
views
Setting runs in solc options at brownie-config.yaml
My goal is to set the runs key of solc to the value of 100 inside the brownie-config.yaml file. I have found two different solutions and I would like to know what is the difference between the two in ...
- 288
0
votes
0
answers
15
views
How to write the function in Brownie respect to the same function of Smart Contract?
I want to run this solidity line function ( fulfillByteAndUint ) :
[![Solidity][1]][1]
from my Brownie frame work , but I don’t know how to define variables in the Parentheses , could you tell me ...
- 7
0
votes
1
answer
182
views
Brownie Error cannot find contract/file
Hello I was starting to write some solidity code with brownie as eth-environment, I tried to compile the code and the import statement is showing en error -
ParserError: Source "@smartcontractkit/...
0
votes
1
answer
57
views
How to fix "Cannot import Lottery from brownie"?
Ran the code as shown and my constructor is public but I keep getting "Cannot import Lottery from brownie" as the error. The Lottery.sol code is below;
// SPDX-License-Identifier: MIT
...
1
vote
0
answers
81
views
Brownie Compile Unicode Decode Error
I am trying to compile this smart contract (fluxAggregator) to setup a Flux-Monitor within VS Code using brownie:
Windows 10, Brownie v1.19.0, Python v3.9.13, Node.JS v16.14.2, NPM v8.13.1
Within the ...
- 171
0
votes
0
answers
49
views
Is it possible to use a custom web3.py middleware with brownie?
I'm trying to use a custom web3.py middleware with brownie to handle the transaction signing and transmission myself.
- 101
1
vote
1
answer
231
views
Getting the address of a contract before its deployed with brownie
While working with the lens protocol contracts I saw that they were able to precompute the address of a contract using hardhat with the following code
import { hexlify, keccak256, RLP } from 'ethers/...
0
votes
0
answers
79
views
eth-brownie works from shell but module not found when called in python script (vscode)
I have eth brownie globally installed but when trying to call a script that imports brownie I get:
Traceback (most recent call last):
File "...", line 3, in <module>
from brownie ...
- 1
0
votes
1
answer
486
views
I am creating random accounts on brownie using accounts.add, are the account address "mine" even in the polygon-testnet?
I am creating random accounts on brownie using accounts.add, are the account address "mine" even in the polygon-testnet? if so, how does brownie know that address is a new address. Also how ...
1
vote
1
answer
57
views
Brownie doesnt compile but says it did
if i run brownie compile i get INFO: Could not find files for the given pattern(s). Brownie v1.19.0 - Python development framework for Ethereum
Project has been compiled. Build artifacts saved at C:\...
0
votes
0
answers
187
views
Encountering "HTTPError: 400 Client Error: Bad Request" when running "brownie test --network polygon-mumbai"
I am trying to do integration testing using brownie and Alchemy on Polygon testnet. However, when I run "brownie test --network polygon-mumbai", I get:
HTTPError: 400 Client Error: Bad ...
- 13
0
votes
0
answers
34
views
eth-brownie install fails on Ubuntu 20.04 due to cytoolz
python 3.8
ubuntu 20.04
install fails due to cytoolz
Tried various online solutions like using pipx and pip to install cython cytoolz before installing eth-brownie, but no luck
Running cytoolz-0.11.2/...
0
votes
1
answer
52
views
Adding dependencies with '@' in version for brownie project
I am trying to add superfluid-finance/protocol-monorepo@ethereum_contracts@v1.3.0 into my brownie project.
brownie-config.yaml:
dependencies:
- superfluid-finance/protocol-monorepo@...
- 13
0
votes
0
answers
33
views
Issue publishing and verifying contracts to Etherscan with brownie, KeyError: 'local' #1579
Environment information
brownie Version: 1.16.4
ganache-cli Version: 6.12.2
solc Version: 0.8.14-fixed
Python Version: 3.9.9
OS: osx
What was wrong?
I'm trying to publish a contract to Rinkeby ...
- 171
1
vote
3
answers
1k
views
How to "flatten" imported contracts
I am trying to publish contracts on etherscan on an already deployed address. How would I "flatten" these imported files;
import "@openzeppelin/contracts/access/Ownable.sol";
...
- 171