Questions tagged [truffle]

Questions regarding the implementation and use of the Truffle development and testing environment.

566 questions with no upvoted or accepted answers
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Deploying on Rinkeby with Truffle using infura

If I want to use HDWalletProvider to deploy my contract on a specific address, what should I do? rinkeby: { provider: () => { return new HDWalletProvider("Mnemnoic", "https://ropsten.infura....
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1answer
41 views

Why is gasestimate coming as “infinite” when I'm trying to return a dynamic array in solidity?

I understand, that as the list grows it is going to cost infinite gas. I'm making a temp array in memory of size of our dynamic array at present size and then returning that array. But does that make ...
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126 views

Unable to run test cases truffle

I am using truffle tests for my smart contract.I guess there is no problem with contracts because I can compile and deploy them in Remix. I can also run truffle migrate --reset successfully, and it ...
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2answers
707 views

How to test contract with multiple accounts / addresses in truffle?

I want to test my truffle contract with multiple msg.sender addresses. Like "the first user sell token, the second user buys this token". For one address I simply write something like contract.buy....
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219 views

External js file not getting load in Truffle test

I'm writing up test cases for my smart contract. Here is the folder structure: - bin - build - contracts - mytestfile.sol - modules - mymodule.js - test - mytestfile.js truffle.js I want ...
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1answer
24 views

In up gradable design pattern how to set the allowed contracts or owner during deployment of smart contracts

Functional Background: Contracts for upgradable design pattern: ProofDB.sol : contract to store the data. Proof.sol : contract that contains the business logic. Registry.sol: contract that ...
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1answer
80 views

Error using web3.js from OpenZeppelin

Please, i need help. I am using truffle to test a smart contract. I run "truffle develop", then "migrate". The contract has been stored in the network. Then I run the command "test". An error occurred:...
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2answers
275 views

How to download or access ('web3/lib/web3/event.js');

The following test script requires('web3/lib/web3/event.js'); const SolidityEvent = require('web3/lib/web3/event.js'); function decodeLogs (logs, contract, address) { return logs.map(log => { ...
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2answers
104 views

Solidity: uint parameter not being set properly

Testing my contract locally with truffle. I have a function with the signature: function purchase(address buyer, address seller, bytes16 bookId, uint tokens) public onlyOwner returns(bool success) ...
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2answers
140 views

when to use MyContract.deployed()?

I was going through truffle-contract docs and came across this function MyContract.deployed() As mentioned in docs this function create an instance of contract abstraction(abi) representing the ...
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61 views

Truffle migrate fails with geth

When I run "truffle migrate" I wait for few seconds than the geth node fall down and I got this truffle error : "Error encountered, bailing. Network state unknown. Review successful transactions ...
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1answer
311 views

Sending string as address to smartcontract

I have trouble sending an address to a deployed contract, my function looks like this: function addNote(uint _value, address _owner) public { ... } and when I'm sending the parameters: contract....
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1answer
153 views

why i get a lot of errors when i use truffle?

Seems that i have a lot of lost dependencies for example installing sha3 errors: > node-gyp rebuild C:\Windows\system32\node_modules\sha3>if not defined npm_config_node_gyp (node " C:\Program ...
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1answer
442 views

truffle migrate cause “Error: insufficient funds for gas * price + value truffle migrate”

When I run "truffle migrate" to deploy contract to geth, I got this error: "Error: insufficient funds for gas * price + value truffle migrate". this is the genesis block of my private chain: { "...
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1answer
112 views

Why does triggering a send on a contract method work, while call doesn't?

I'm still somewhat new to web development and solidity, so do correct any of my misunderstandings. I've been working with web3 on the front end, but now I'm trying to set up a server side web3 ...
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0answers
57 views

How to find module in truffle pack

I am trying to run a JS test script with truffles but I can not seem to find the right place to store the assertRevert file so that the module can be found by the script when I try to run the test. ...
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0answers
180 views

Cannot read property '2' of null ERROR during truffle compilation

Here is the source code. pragma solidity ^0.4.24; import"./SafeMath.sol"; contract erc20 { function totalSupply() public view returns (uint256); function balanceOf(address who) public view ...
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1answer
130 views

Error npm installing consensys diligence takehome bignumber util

``` /sudo npm install Password: Unhandled rejection Error: Command failed: /usr/local/bin/git clone --depth=1 -q -b master https://github.com/debris/bignumber.js.git /Users/quantum/.npm/_cacache/tmp/...
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1answer
457 views

Truffle compiling error

I having the error below when I tried compile the contract. Should I downgrade the truffle version? If yes, which version because I couldn't find the appropriate version for sol 0.4.18. Thanks ...
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1answer
45 views

Is it necessary to fetch the history from toBlock to fromBlock by giving the non zero block number?

I have one event inside my solidity smart contract and in web application I am fetching the values using "contractInstance.Transferred({}, {fromBlock: 0, toBlock: 'latest'}).get". When I changes the ...
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33 views

Ger transaction details from the variable declared in smart contract

I have written smart contract in which I have declared one variable like uint256[] public UserIdList. And I am adding 3 userids while migrating that contract. Now, I am doing the mapping of user id ...
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0answers
84 views

Truffle error during migration

I am getting an error when I run : truffle migrate --network production Error Running migration: 1_initial_migration.js Deploying Migrations... ... ...
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0answers
39 views

Can the result of a call trigger the execution of a transaction?

Supposing I have a transaction (A) = a call (B) + other storage operations (C). Executing A, beeing a transaction, I have to pay the gasUsed by B and C. Beeing B an expensive call and since I need the ...
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1answer
335 views

Error when testing smart contract - use truffle and solidity

I'm executing a example in this link. https://truffleframework.com/tutorials/pet-shop While testing testing with file "TestAdoption.sol", I have encountered the error "Source truffle / Assert.sol not ...
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0answers
34 views

How to .endSale from a contract?

I am writing a smart contract for a token sale. How can I endSale destroy contract and transfer remaining tokens and accumulated ethers from the sale to admin wallet ( using truffle commands)? I ...
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1answer
250 views

How to deploy smart contract to main ethereum network

I am tring to deploy our ERC20 token in main net it gives an error Error: exceeds block gas limit. First I download or sync whole blockchain using geth command ( geth --syncmode "fast" --rpc --rpcapi ...
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0answers
103 views

Unable to deploy contract on Ropsten network

When I try to migrate contract to Ropsten Network (truffle migrate --network ropsten) it keeps migrating the contract on the net with id 4447 unless Ropsten is the only network configured in truffle....
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1answer
316 views

Contract not using Upgraded Proxy Contracts

There's 2 contracts A and B, A imports B, where B is a library that can be upgraded. To achieve this, I tried replacing B with a proxy contract and a delegate contract. We now have contracts Foo, ...
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1answer
111 views

Transaction reverted when testing requires/asserts in non void functions

im trying to test the requires of a Smart Contract using just solidity according to this article: http://truffleframework.com/tutorials/testing-for-throws-in-solidity-tests This is the contract, the ...
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1answer
70 views

Solidity Test - which are the variables and keywords over here

Can anyone help me in understanding what is happening over here? I understand that the contract name is TestAdoption, but after that - what is the first word "Adoption"? The second word "adoption". I ...
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1answer
257 views

SenTransaction can't send Ether to a contract address

I am using openzeppelin, Ganache and truffle, here's a very simple smart contract for fundraising: pragma solidity 0.4.24; import 'openzeppelin-solidity/contracts/crowdsale/Crowdsale.sol'; contract ...
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0answers
414 views

Ubuntu 16.04: Truffle: command not found

I installed the truffle on my Ubuntu machine and it installed successfully but when i am trying to execute truffle commands it is saying; truffle: command not found I tried the solution mentioned in ...
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2answers
153 views

How is gas price too low corrected (truffle deploy)?

truffle.js module.exports = { networks: { development: { host: "127.0.0.1", port: 8540, network_id: "*", gas: 4600000, gasPrice: 4000000 // Match any network id } ...
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1answer
151 views

How to solve eth_getFilterChanges looping when deploying with truffle (parity)?

I am using truffle migrate and I get some kind of loop which just endlessly prints out eth_getFilterChanges. How can this be solved? I have used this truffle.js module.exports = { networks: { ...
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1answer
615 views

How to deploy a contract to parity using truffle?

I get this when trying to deploy to parity - Writing artifacts to ./build/contracts Invalid JSON RPC response: "Provided Host header is not whitelisted.\n" I am new to using truffle with ...
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1answer
47 views

Gas amount to store a contract?

i'm trying to run truffle migrate and it gives me always this error. Error: The contract code couldn't be stored, please check your gas amount. MBP-de-Alicia-2:smartContracts alicialombarte$ truffle ...
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0answers
70 views

Why account balance can decrease when gasPrice is 0 and msg.value is 0?

It also spends pretty large amount, which doesn't seem to be related to gasUsed Contract: pragma solidity ^0.4.24; contract Test { bool i; function hello() public { i = true; } }...
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0answers
58 views

Truffle contract compilation from STDIN or something like this

My contracts have some methods that used only for testing i.e. exposes some internal contract data and I do not want to deploy it to live network. for now Solidity does not supports C-style ...
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1answer
120 views

web3 js send ether not broadcasting on main net

I am using folowing code sample to send ether between 2 of my own accounts, both have enough funds: "use strict"; var Web3 = require('web3'); var Tx = require('ethereumjs-tx'); // Show Web3 where it ...
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0answers
92 views

not able to fetch bool value from contract using truffe

Index.html: <input id="txtUser" type="text" placeholder="Enter user name" /> <button id="btnAuthenticate" onclick="App.Authenticate()">Authenticate</button> contract: function ...
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1answer
1k views

Truffle Error : VM Exception while processing transaction: revert

I am trying to call following function of smart contract from App.js: function addCandidate(bytes32 _name, bytes32 _party) public{ //require(msg.sender == votingAdmin); //if(msg.sender != ...
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2answers
650 views

Error: VM Exception while processing transaction: revert: When trying to migrate a truffles initialised contract?

I'm trying to migrate/deploy a multi-signature contract through truffles, I am receiving "Error: VM Exception while processing transaction: revert" when the contract starts to migrate/deploy. ...
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0answers
43 views

Return remaining ether for user: user lost too much ethers

I writing a smart contract using Truffle and testing for that. I current meet this problem: I send 0.5 ether to smart contract. After that, contract get 0.0016 ether. (tested) Then transfer again ...
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2answers
103 views

Fetch the last state of particular asset for particular date

I have one smart contract, in which I am doing mapping of machine id and user id mentioned as below: mapping(bytes32 => uint256) public machineAllocs; machineAllocs[machineId] = userId; Now, I am ...
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0answers
660 views

Truffle Test Sell Event Assertion Error

When I test my selling event in truffle.So, the following error comes:- The solidity code is :- event Sell(address _buyer, uint256 _amount); // Buy token function buyTokens(uint256 _numberOfTokens) ...
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0answers
293 views

Local geth node for Ropsten keeps crashing and lost data

I am creating a local geth node participating in Ropsten to test my smart contract with other smart contracts such as ENS and Oraclize. Somehow I keep running into problem of geth crashing and losing ...
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2answers
672 views

How to access Truffle deployed contracts with app's javascript code?

I have some smart contracts deployed with Truffle on the local Ganache network, but I don't know how to access it with the app's javascript in order to make function calls to the contract. How would I ...
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0answers
361 views

How to use MetaMask Web3 with Truffle promises

My project uses the react truffle box, and I use the getWeb3 method that comes with it. After calling that method, I store the web3 object on Redux's state tree via the action creator storeWeb3. ...
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1answer
204 views

which wallet is usable with ganache test-rpc?

I tried metamask, but unable to send ether between accounts because metamask is trying to estimate gas and gets stuck :( myetherwallet doesn't save my seed so I need to enter it all the time
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0answers
207 views

Invalid op code from truffle console

I'm following this tutorial for a simple contract. https://blog.zeppelin.solutions/the-hitchhikers-guide-to-smart-contracts-in-ethereum-848f08001f05 After running testrpc, compiled with truffle ...