Questions tagged [truffle]
Questions regarding the implementation and use of the Truffle development and testing environment.
2,179
questions
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3 views
Does every solidity contract need to be migrated individually in truffle?
I have a .sol file with an ERC20 token and 3 "contracts" (The token interface, safemath and TestToken). In my migrations folder, do I need to do a separate migration file for each of the ...
0
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0answers
9 views
Truffle - deploy and interact with a contract locally from a script
I have created a contract, wrote a migration and a test. When I run truffle test the contract is deployed locally and then the tests are run against it. All is working fine.
I also added a function to ...
0
votes
1answer
10 views
Truffle re-deploy unchanged contracts on every migrate
On every truffle migrate truffle deploy contracts even if they are not changed.
although it doesn't re-compile
Truffle v5.0.5
0
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1answer
18 views
Truffle test. Convert '0x0000000000000000' to zero. Assert it doesn't exist [duplicate]
I am writing a truffle javascript test and I need to test if a key in a mapping was deleted. After deleting it, its values are equal to '0x0000000...' . How can I test in a truffle javascript test ...
0
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1answer
34 views
How to test abstract contracts using truffle?
Is it possible to test abstract contract using truffle? If yes, how I can to do it?
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0answers
13 views
Why am I receiving the error when running “npm run start” for the client folder inside the truffle react box? [closed]
I am getting the following error when I run npm run start for the clients folder inside the truffle react box. Here's the error:-
There might be a problem with the project dependency tree.
It is ...
1
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0answers
17 views
Truffle test: how to get the block number of deployed contract?
In my test I would like to get the block or block number of when the contract was deployed.
const instance = await MyContract.deployed()
const contractDeploymentBlockNumber = await instance.?
0
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0answers
19 views
Truffle console is hanging on function call
I have a contract deployed to ropsten. It has a function called enter:
function enter() public payable {
assert(msg.value == MINIMUM);
assert(OPEN == true);
players.push(...
0
votes
1answer
39 views
How to deploy kyber network proxy locally and test with truffle?
I am trying to deploy a proxy from Kyber Network for local development. So far I have pulled down the workshop repo and I have successfully deployed all the contracts successfully. I have the ...
0
votes
1answer
23 views
Questions about Truffle console and Truffle develop
When I inputted truffle console, it showed the error:
ā via-issuer-master truffle console --network interaction
truffle(interaction)> var cash = aw
/usr/local/lib/node_modules/truffle/build/...
1
vote
1answer
19 views
Get deployed contract dynamically in node JS
I am using Node JS and ethereum smart-contract. Every time contract gets deployed new addresses generated.
Is there a way that node JS always gets an updated address of a contract? Any API so that I ...
0
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0answers
20 views
Ganache stuck when loading truffle project
I am not sure what can be wrong. When I try to load a truffle project (by adding the truffle-config.js file to the workspace config), ganache gets stuck at the loading icon and I get this lines at the ...
0
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1answer
16 views
DeclarationError: Uninitialized storage pointer. Struct error when running truffle tests
I've seen other similar questions but they don't explain why this error happens and/or they are case specific questions. So, I have this code:
pragma solidity >=0.4.22 <0.7.0;
contract ...
0
votes
1answer
16 views
Truffle cant deploy contract with reverting constructor
I'm developing a dapp with the truffle suite and now I'm running into a problem.
Everything is working locally in the ganache instance.
My contract should disallow direct payments to the contract, so ...
0
votes
1answer
22 views
Reproducing a Ganache Server across multiple computers
There are multiple developers on the team and it seems as though we all want to be working on a specific test network with specific public and private keys with a specific number of users who all have ...
0
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1answer
24 views
call a contract function which creates a new contract in web3.js makes an error VM Exception while processing transaction: revert
At first I'm developing with truffle v5.1.34, Node v10.16.0, Web3 v1.2.4
To make it simple, I have a Two contracts, DApp and User
What i'm doing is call a DApp contract function which creates a new ...
0
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0answers
14 views
Failed to use truffle develop
When I successfully compiled and deployed contracts using Truffle and ganache-cli, I typed truffle develop to get into the truffle(develop)>, and then typed let instance = await Factory.deployed(), ...
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0answers
14 views
unable to see the first address using web3.eth.getAddress()
I tried to see all address using
web3.eth.getAccounts()
It's run perfectly. Next I tried to see the first address using
web3.eth.getAccounts().then(function(accounts) {return accounts[0]})
It's also ...
0
votes
1answer
37 views
Transaction underpriced at 5000000 gas but overpriced at 10000000
I've been developing a smart contract for a while on the Ropsten network using the Truffle framework, quite successfully. My truffle-config.js looks like this:
const path = require("path");
...
1
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0answers
27 views
Is Truffle test useful?
Hi there I came across "Truffle test". As a developer I feel like it's better to test code on remix for unit testing rather than wasting time on writing truffle test in javascript. What do ...
0
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0answers
31 views
Testing using Truffle unbox: Assert.equal error
I ran the pet shop project. It uses "truffle unbox". The petshop project at:
Petshop project using Assert.equal without any error
is able to execute Assert.equal command but when I am using ...
0
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0answers
38 views
How to debug this metamsk error ? - Error: [ethjs-rpc] rpc error with payload:
I have a DApp integrated with metamask and ganache, front-end built on react. I am getting this error when I interact with the smart contract from front-end, contract send calls. Smart contract ...
0
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0answers
23 views
ERR_SSL_PROTOCOL_ERROR while connecting private blockchain
I'm working with private blockchain, and facing some issue with SSL configuration.
The system has two components:
The private blockchain that is configured on the VM.
The web application that ...
0
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0answers
32 views
Problem with Assert.equal
I am compiling the code available at using "truffle test":
https://michalzalecki.com/ethereum-test-driven-introduction-to-solidity/
pragma solidity 0.5.16;
import "truffle/Assert.sol&...
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0answers
29 views
What does an Ethereum Client do?
I've developed Smart Contracts using Solidity, and then created a front end for them using Web3js. I used Truffle to to get them to communicate. That's how I tried out a couple of Proof of Concepts. I ...
0
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0answers
19 views
Compile error. Fallback function error
I use pragma 0.6.2. I am trying copile in truffle code which contain this lines:
fallback() external payable{}
I an getting error:
The payable fallback function is defined here.
fallback() external ...
0
votes
1answer
30 views
Solidity ^0.6.10 returnBalance() returns “VM Exception while processing transaction: invalid opcode”
I am using Ganache and Truffle console. I compile and migrate the following contract:
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.10;
contract EthReceiver {
address payable private owner;...
0
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0answers
16 views
Is there a way to get revert message by my client?
I have a smart contract with this simple function:
function addUser( string memory _username, string memory _nome, string memory _cognome, string memory _email) public isOwner() {
require(bytes(...
0
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0answers
23 views
Is there a tool to add SafeMath to production code?
There are a lot of tools to prepare JavaScript/CSS code for production, e.g. to minimize, to convert ES8 code to ES5. Is there a tool to automatically apply SafeMath library to a .sol file?
The ...
0
votes
1answer
41 views
Compilation Error
Hi guys I got this error when I try to compile using truffle develop.
truffle(develop)> compile
Compiling your contracts...
Compiling ./contracts/StarNotary.sol
/mnt/d/Blockchain/...
0
votes
1answer
24 views
Error: while migrating Event: invalid address (arg=“benificiaryAddress”, coderType=“address”, value=undefined) [closed]
let Event = artifacts.require("./Event.sol");
const field= {
nameOfEvent : "Music",
ticketCount : 100,
ticketCharge :10000,
durationInMinute :1200
}
module....
0
votes
1answer
53 views
I am getting Error: Project ID is required deploying to ropsten in truffle
I am getting the following error:
Error: PollingBlockTracker -
encountered an error while attempting to update latest block:
Error: project ID is required
at C:\Users\myuser\Code Projects\sdfsd\...
0
votes
1answer
144 views
Swap ether to tokens on Uniswap V2 Router 02 fails
I am trying to buy DAI tokens from my smart contract using IUniswapV2Router02
contract BuyExample{
IUniswapV2Router02 usi = IUniswapV2Router02(...
0
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0answers
15 views
Setting up a desktop wallet with a private network on geth
Disclosures:
I've never set up a wallet before, and am new to geth.
I'm not worried about security right now. My goal is to set up several wallets on my private chain (if possible) in order to learn ...
1
vote
1answer
94 views
Ethereum Error: Provider does not support subscriptions: HDWalletProvider
I am making a flash loan request using web3 , truffle and keep getting the error in an event listener:
The current provider doesn't support subscriptions: HDWalletProvider.
I am connecting to the ...
0
votes
0answers
43 views
Convert from 0.4.17 to 0.6.2
I made a conversion from Solidity 0.4.17 to 0.6.2 of a contract that have a MINT option.
The biggest problem here is that I am not sure if this function mint is okay (will return the correct id).
Look:...
0
votes
1answer
37 views
Sending ETH from contract to EOA
OK, I'm baffled guys. maybe it's the amount of gas the function is using up that is causing this not to work.
when I call the function:
I get the following in response but no movement of Eth from my ...
0
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0answers
30 views
Truffle console: Exception instead of transaction
I am running the tutorial at:
Medium Just Dev
pragma solidity ^0.5.0;
import './Victim.sol';
contract Attacker{
Victim public v;
uint public count;
event LogFallback(uint c, uint ...
0
votes
1answer
28 views
Truffle Migrate
What happens when there is a minor change in the smart contract and I run truffle migrate command.
Example:
//before
contract test{
function display() public returns (string){
return "...
0
votes
0answers
17 views
Truffle test stuck when testing with geth endpoint
I tried to test the truffle suite official metacoin example using truffle test. I opened a local private chain using geth with http rpc service open at localhost:8545. My truffle-config.js file is ...
0
votes
0answers
27 views
Truffle + Infura Mainnet deploy. Transactions never get mined, timing out after 750 seconds
The contract deploys on Rinkeby without a hitch, but when it comes to mainnet it is erroring out strangely. Infura's HTTP endpoint was giving me Invalid JSON RPC RESPONSE "", so I decided to ...
0
votes
0answers
27 views
'VM Exception while processing transaction: revert\n' Error Processing transaction
I have read in various posts that this error occurs when there is a problem with executing function. So I'm asking about this error in regards to the code I have written.
Please see below:
contract ...
0
votes
0answers
19 views
Truffle Console: How to suppress unwanted message
I am trying to learn truffle features by going through the following tutorial. Its generating a huge message, please guide me if its wrong or not. If its not wrong please guide me how to suppress the ...
0
votes
1answer
28 views
Truffle Console error : invalid number value. Value must be an integer, while executing commands from a tutorial
I am trying to execute commands from the following tutorial:
medium Dev Tutorial
I am getting an integer error while executing a command:
truffle(ganache)> balanceInEth = address => web3.utils....
0
votes
1answer
62 views
Error compiling OpenZeppelin 3.0 ERC20 using Truffle
I'm trying to compile this code using the Truffle command truffle compile
pragma solidity ^0.6.0;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
contract GLDToken is ERC20 {
...
0
votes
1answer
47 views
Can't unlock account while deploying contract with truffle
I am trying to set up a private blockchain with geth, using truffle to deploy a smart contract to it. My goal is to get a private blockchain running with several accounts, deploy some contracts to it ...
0
votes
0answers
24 views
Error Truffle Console: web3.fromWei is not a function
I am executing commands from a tutorial at:
JustDev Tutorial on Medium
I am executing the command:
> truffle(ganache)> balanceInEth = address =>
> web3.fromWei(getBalance(address).toString(...
0
votes
0answers
13 views
Garbage Value on Truffle console while executing the commands from a tutorial
I am following the tutorial at:
JustDev tutorial on medium
When I execute the command:
truffle(ganache)> Victim.deployed().then(contract => victim = contract)
I am getting a huge output which ...
1
vote
0answers
64 views
Solidity function calls from javascript work locally but fail on ropsten,kovan etc with Error: Returned values aren't valid, did it run Out of Gas?
I have a smart contract whose function calls works fine when called locally using javascript and ganache.
But when I deploy to ropsten and others, the calls to its functions fail with
Error: Returned ...
1
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0answers
45 views
Deploy smart contract to private network
I have been having issues deploing any smart contract to my private network.
I'm using geth 1.9.15.
Here ALL the steps that I made to get the error:
//CustomGenesis.json
{
"config": {
&...
