Questions tagged [truffle]

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

569 questions with no upvoted or accepted answers
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After compiling contract, there is no build directory inside project directory?

After writing 'truffle compile' in terminal , it just give the message i.e. compiling your contracts...and exit, no build directory is formed in Project directory. What is the issue?
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18 views

Metamask browser apps reusing Truffle tests?

After reading the documentation about metamask (https://github.com/trufflesuite/trufflesuite.com/blob/master/src/docs/truffle/getting-started/truffle-with-metamask.md) is not clear to me whether it's ...
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88 views

Web3 & Solidity - Automatically read ABI and Create Contract

Is there a way to automatically create a new Solidity Contract - from within a web3 JS file using the .json file created in a project's build folder after each compile? I have already figured out how ...
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2answers
558 views

Default getter and setter for mapping in solidity

In my smart contract I've public mapping as mapping (uint=>User) public users where User is a Struct, so is there any way to get the values of this mapping using default getter. For Example : If ...
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106 views

How to use multiple app.js in truffle project?

I'm new to blockchain and currently developing small application for educational purpose using solidity. I am using truffle framework and stuck at a point. currently there is only one app.js file in ...
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1answer
801 views

Truffle console error “Error: Returned error: VM Exception while processing transaction: revert”

I compiled and migrated my solidity codes of erc20 token to development networks on truffle, and use it on truffle console. truffle(development)> let instance = await XToken.deployed() truffle(...
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64 views

HTTP query create request error for oraclize

I have tried to deploy a sample contract having oraclizer query using truffle+ethereum bridge+solidity. First ethereum bridge made up and got OAR address which is used in sample contract in ...
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2answers
234 views

Solidity & truffle: get elements from strings array

i'm glad to follow this forum, it is very helpful. I'm using truffle to develop contracts and i just found that dynamic arrays are not yet suported, for that reason i was using string arrays with a ...
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24 views

Is it possible to write to a file from a truffle console?

I am running some tests on my smart contracts and I need to gather a bunch of data to process in a spreadsheet. Is it possible to write to a file from the console?
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1answer
109 views

Invalid JSON Response while connecting DApp, Metamask and Backend

I am getting some error(picture below) while trying to connect DApp with a backend. One day ago, everything worked fine, now I got an error: "basic auth failure". Contracts are deployed on Ropsten ...
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126 views

Revert on ERC20.transferFrom

I am getting Error: Returned error: VM Exception while processing transaction: revert when testing MyContract.deposit() Here are simplified versions of my code to highlight where the issue is ...
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274 views

Truffle migrate not working with 2_deploy_contracts.js

I have made a sample contract using Truffle's pet-shop. I have also added the 2_deploy_contracts.js file. I have changed the solidity version and also the constructor() public {} to comply with the ...
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108 views

truffle cant find function from contract made with address and abi

So I have a factory contract "RestaurantFactory" which i migrate, this contract creates another contract "Restaurant", after deploying the RestaurantFactory and calling createRestaurant() I receive an ...
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45 views

Issue with truffle migrate

I'm trying to migrate a simple contract on the ganache blockchain.But when I type 'truffle migrate' command in the terminal.It freezes for some time and then command execution stops without showing ...
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0answers
111 views

unable to deploy contract on rinkeby network

I am trying to deploy my contract to rinkeby test network but unable to do so here is my contract code. pragma solidity ^0.4.17; contract Inbox { string public message; function Inbox(string ...
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70 views

Web3 vs. web3.js

Experienced iOS developer here - but very new to Ethereum Smart Contract development. I'm trying to figure out why the web3 version that gets loaded by MetaMask into my browsers when I run my app (...
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1answer
787 views

Specify different solc compiler for different files in truffle?

I am using truffle, and have a number of x.sol files in the contracts directory, different files require different versions of the compiler - how do i deal with that? I think i SHOULD be able to do ...
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207 views

“SyntaxError: Unexpected token” on truffle develop

Once I run truffle develop this is the error I am getting. /usr/local/lib/node_modules/truffle/build/cli.bundled.js:33499 Config.search = (options = {}, filename) => { ^ ...
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22 views

Truffle Deployment

I have created a DAPP using Truffle & Ganache. It is working fine in development server after running the following command. $ganache-cli Deploy the contract. $truffle migrate --reset Run the ...
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1answer
375 views

truffle migrate does not return anything

I am following the tutorial from Truffle to create a "pet shop" contract. I can follow everything until he tells me to truffle migrate. Here is the contract: pragma solidity ^0.5.0; contract ...
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72 views

VM error in Truffle

Running the code below returns a vm error: Error: Returned error: VM Exception while processing transaction: revert at Object.ErrorResponse (node_modules/truffle/build/webpack:/~/web3-eth/~/web3-...
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0answers
9 views

Truffle Console detecting a single key press as multiple key presses

So I have installed truffle using: npm install truffle -g, now when running the truffle console some of the key presses are being detected as two key presses for example, pressing up to load the last ...
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160 views

TypeError: web3_eth_personal__WEBPACK_IMPORTED_MODULE_0___default.a is not a constructor

I have an application using truffle and webpack. When I run npm run server ( server's definition in package.json is : "server": "concurrently 'webpack --mode development --watch' 'wait-on build/...
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1answer
306 views

Unhandled Rejection (Error): invalid string value (arg=“x”, coderType=“string”, value=5)

Using Truffle unbox react to unbox a boilerplate. received the following error from running npm run start Changes: Addition of "memory" parameters in the simpleStorage.sol Changed unit to string in ...
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1answer
52 views

Execution gas cost

I use web3 and truffle to get info about my testnet transactions. There are few fields about gas used per transaction, such as: gasPrice, gas, gasUsed. But how to get field 'execution cost'?
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115 views

Web3 Contract Constructor Error

Currently getting this error in my Browser's Console: My current set up is as follows: Truffle v5.0.3 (core: 5.0.3) Solidity - 0.5.0 (solc-js) Node v8.9.4 Here's my code - and note that I'm using ....
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54 views

How do I solve this error involving web3 and webpack in my truflle-react box based project?

The project is a truffle-react trufflebox, a bounties creating and solving application. It uses Truffle v5.0.1. This is the home page. Below is the page that displays when you click on the 'Become a ...
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0answers
171 views

How to call contract method from specific address and private key without Metamask check

Good morning, I need to known how call contract method in javascript from specific address(and relative private key) without the check of Metamask. I explain better. This is an example of js code, ...
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19 views

Research Papers related to Mythril, Truffle and ReMix

I have found research papers related to most of the testing tools like Oyente, Gasper, MadMax, Securify and so on but I can't find research papers related to Mythril, Truffle and Remix. Are these ...
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212 views

Transferring ether balance from contract balance to winner,not working

here is my Solidity snippet: function deliverPrizes(address payable winner) public onlyOwner{ winner.transfer(address(this).balance); } This is what I wrote on truffle console: dCoders....
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2answers
61 views

find the bytecode of a contract during compilation

Is there a solution to recover the complete bytecode (init + runtime) of a contract imported in solidity. For example "bytes code = getBytecode (Escrow.sol)" and this would be replaced by bytecode ...
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620 views

FATAL ERROR: Rebalance Allocation failed - process out of memory

So while running truffle compile for my contracts on AWS Ubuntu server I got the following error: <--- Last few GCs ---> [17055:0x3985730] 11958 ms: Scavenge 511.7 (553.4) -> 506.9 (553.4) ...
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1answer
418 views

Build failed SyntaxError: Unexpected token: name (length)

I setup truffle unbox react-auth and add few libraries as shown in my package.json below. I have no problem running npm run start but failed to compile npm run build with the following error: ...
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196 views

How to `truffle migrate` to private permissioned network?

I am running a private permissioned network and would like to use Truffle v5.0.1 for deployment. I use it according to the documentation: Compile my project with truffle compile so that the ./build ...
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128 views

Invalid opcode on estimateGas 'code': -32000

this is my contract : pragma solidity >=0.4.21 <0.6.0; contract CloudProject { uint public nbCandidates = 0; uint public nbBureau = 0; uint public nPartiPouvoir = 0; ...
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1answer
311 views

web3 Uncaught TypeError: Cannot read property 'createBox' of undefined

i'm trying to create simple application by using solidity 5.0.0 , Truffle v5.0.0 and web3 web3@1.0.0-beta.34. but i've gotten Uncaught TypeError: Cannot read property 'createBox' of undefined. ...
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1answer
374 views

Truffle Migrate Error: Could not find built Migrations contract: Unexpected token in JSON at position 0

Running truffle migrate with valid contract code started causing this error for me: Writing artifacts to ./build/contracts Using network 'development'. Error: Could not find built Migrations ...
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1answer
165 views

Solidity: How are multiple return values returned?

Working in truffle with TDD testing and am getting some errors when evaluating the return values of some functions. If a function is returning multiple values in Solidity, how are they presented? Is ...
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2answers
77 views

(Truffle) how to call finalize() function after finishing crowdsale

I would like to call token.transferOwnership(msg.sender) after finishing timed crowdsale. So, I inherited FinalizableCrowdsale contract, then override finalization() function to call transferOwnership ...
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1answer
37 views

Truffle Exec Return Events

I have set up a JavaScript file that takes in my contract and executes the various functions and then returns the correct events. The file runs through 'truffle exec'. I am using the following line ...
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1answer
38 views

InterfaceImp constract defined success,but interface function called failed

I'm trying to call a interface function for testing, but it can't work. Here is my test contract: pragma solidity ^0.4.24; interface InterfaceTest{ function testInterface() external pure ...
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1answer
237 views

Truffle migrate code with library, interface and contract

Suppose that I have a token contract as follow. How can i write the new migration.js file in truffle to deploy the contract? TestCoin.sol import "openzeppelin-solidity/contracts/math/SafeMath.sol"; ...
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378 views

Truffle-contract error on deployed contract

Playing around with the gnosis multisig, using truffle-contract to interact with already deployed MultiSigWallet using truffle migrate. Contents of the file I am trying to run: var contract = ...
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1answer
68 views

Truffle console no compile or init options

While using truffle.cmd console I tried to use the compile option, or even init. These options are not available, so I cannot compile using console. truffle(development)> .help .break Sometimes ...
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1answer
44 views

Problem watching events without invoke functions in the Smart Contract

I have an event which is sent each time when a contract is deployed. It is launched in the constructor. I have a Dapp where I want to watch this event to send a tx each time that a smart contract is ...
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1answer
338 views

Error: Cannot find module 'ethereumjs-wallet'

A truffle test needs ethereumjs-wallet const wallet = require('ethereumjs-wallet'); I tried npm install ethereumjs-wallet and even npm uninstall ethereumjs-wallet npm install --save ethereumjs-...
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2answers
79 views

promise chaining in test.js file

it("should throw an exception if you try to buy an article that does not exist", function() { return ChainList.deployed().then(function(instance) { chainListInstance = instance; ...
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2answers
157 views

Intracting with dapp using frontend truffle petbox

App = { web3Provider: null, contracts: {}, account: '0x0', init: function() { // Load pets. return App.initWeb3(); }, initWeb3: function() { if (typeof web3 !== 'undefined') {...
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0answers
158 views

Setup Parity PoA network compatible with truffle framework deployment mechanizm

The question from the title kind of wraps around the real problem but it is actually what I'm having trouble making work. I'm trying to setup production PoA network so using all the flags made for ...
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2answers
624 views

Running solidity-coverage with truffle gives error: can not find 'coverageEnv/migrations'

Running solidity-coverage gives the following error: $npm run coverage ... Writing artifacts to ./build/contracts Launched testrpc on port 8555 Running: node --max-old-space-size=4096 ../...