Ethers.js: Discussion: Using ethers.js with truffle

[subramanianv]

Any pointers on using ethers.js with truffle ?

[ricmoo]

Still highly experimental, but try out my npm package ethers-cli. It replaces much of truffle, and has a TestRPC included along with the ethers hook-ups to make it all work.

I hope to get the documentation up week after next, but until then it will be a lot of poking around source code to figure it out.

I'll post the Firefly sticker code tomorrow which uses it for testing, building and deploying.

[subramanianv]

Thanks ! Ethers.js is awesome and clean to use !

[pkieltyka]

yes ethers.js is a huge contribution to the community. Thank you @ricmoo - ethers-cli is great too.

The community needs a standard interface for ethereum web client, so users can converge on tooling. Ie. the ruby rack for ethereum, but for clients.

[robertmagier]

I installed ethers and ethers-cli and still getting Error: Cannot find module 'ethers' in truffle. Hard to figure out what to do. It doesn't make any sense. I am coming back to web3

[ricmoo]

@robertmagier

How were you attempting to use ethers? I just tried truffle out and was able to just use:

var ethers = require('ethers');

Can you provide an example project which does not work?

[mrwillis]

Just to be clear, can I use truffle ABI files with ethers.js? Here are some lines I'm piecing together right now in a truffle test file (I'm using the experimental ABI):

const { providers, Contract } = require('ethers');
const registryAbi = require('../build/contracts/Registry.json');
const web3Provider = new providers.Web3Provider(web3.currentProvider);
const signer = web3Provider.getSigner(accounts[0]);
const registry = Registry.deployed();
const registryWrapper = new Contract(Registry.address, registryAbi.abi, signer);

Am I on the right track here? I tried just sending in registryAbi instead of registryAbi.abi but I got abi.forEach is not defined.

Thanks

[ricmoo]

Can you paste and example of what the ABI looks like here? It should work, since it is just the Solidity ABI format.

[mrwillis]

Here's a snippet. Everything seems to be OK so far.

{
  "contractName": "Registry",
  "abi": [
    {
      "constant": false,
      "inputs": [],
      "name": "renounceOwnership",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [
        {
          "name": "",
          "type": "bytes32"
        }
      ],
      "name": "markets",
      "outputs": [
        {
          "name": "",
          "type": "bool"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "owner",
      "outputs": [
        {
          "name": "",
          "type": "address"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [
        {
          "name": "",
          "type": "bytes32"
        }
      ],
      "name": "hashToMarket",
      "outputs": [
        {
          "name": "baseToken",
          "type": "address"
        },
        {
          "name": "startDate",
          "type": "uint256"
        },
        {
          "name": "expiryDate",
          "type": "uint256"
        },
        {
          "name": "referenceEntity",
          "type": "string"
        },
        {
          "name": "referenceCoin",
          "type": "string"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "_newOwner",
          "type": "address"
        }
      ],
      "name": "transferOwnership",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": true,
          "name": "startDate",
          "type": "uint256"
        },
        {
          "indexed": true,
          "name": "expiryDate",
          "type": "uint256"
        },
        {
          "indexed": true,
          "name": "referenceEntity",
          "type": "string"
        },
        {
          "indexed": false,
          "name": "marketHash",
          "type": "bytes32"
        }
      ],
      "name": "MarketRegistered",
      "type": "event"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": true,
          "name": "startDate",
          "type": "uint256"
        },
        {
          "indexed": true,
          "name": "expiryDate",
          "type": "uint256"
        },
        {
          "indexed": true,
          "name": "referenceEntity",
          "type": "string"
        },
        {
          "indexed": false,
          "name": "marketHash",
          "type": "bytes32"
        }
      ],
      "name": "MarketUnregistered",
      "type": "event"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": true,
          "name": "previousOwner",
          "type": "address"
        }
      ],
      "name": "OwnershipRenounced",
      "type": "event"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": true,
          "name": "previousOwner",
          "type": "address"
        },
        {
          "indexed": true,
          "name": "newOwner",
          "type": "address"
        }
      ],
      "name": "OwnershipTransferred",
      "type": "event"
    },
    {
      "constant": false,
      "inputs": [
        {
          "components": [
            {
              "name": "baseToken",
              "type": "address"
            },
            {
              "name": "startDate",
              "type": "uint256"
            },
            {
              "name": "expiryDate",
              "type": "uint256"
            },
            {
              "name": "referenceEntity",
              "type": "string"
            },
            {
              "name": "referenceCoin",
              "type": "string"
            }
          ],
          "name": "market",
          "type": "tuple"
        }
      ],
      "name": "registerMarket",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "components": [
            {
              "name": "baseToken",
              "type": "address"
            },
            {
              "name": "startDate",
              "type": "uint256"
            },
            {
              "name": "expiryDate",
              "type": "uint256"
            },
            {
              "name": "referenceEntity",
              "type": "string"
            },
            {
              "name": "referenceCoin",
              "type": "string"
            }
          ],
          "name": "market",
          "type": "tuple"
        }
      ],
      "name": "unregisterMarket",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [
        {
          "name": "marketHash",
          "type": "bytes32"
        }
      ],
      "name": "getMarket",
      "outputs": [
        {
          "components": [
            {
              "name": "baseToken",
              "type": "address"
            },
            {
              "name": "startDate",
              "type": "uint256"
            },
            {
              "name": "expiryDate",
              "type": "uint256"
            },
            {
              "name": "referenceEntity",
              "type": "string"
            },
            {
              "name": "referenceCoin",
              "type": "string"
            }
          ],
          "name": "",
          "type": "tuple"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    }
  ],
  "bytecode": 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  "source": "pragma solidity 0.4.24;\npragma experimental ABIEncoderV2;\npragma experimental \"v0.5.0\";\n\nimport \"./libraries/LibMarket.sol\";\nimport \"openzeppelin-solidity/contracts/ownership/Ownable.sol\";\n\n\ncontract Registry is Ownable {\n\n    using LibMarket for LibMarket.Market;\n\n    mapping(bytes32 => bool) public markets;\n    mapping(bytes32 => LibMarket.Market) public hashToMarket;\n\n    event MarketRegistered(\n        uint256 indexed startDate,\n        uint256 indexed expiryDate,\n        string indexed referenceEntity,\n        bytes32 marketHash\n    );\n\n    event MarketUnregistered(\n        uint256 indexed startDate,\n        uint256 indexed expiryDate,\n        string indexed referenceEntity,\n        bytes32 marketHash\n    );\n\n    modifier marketValid(LibMarket.Market market) {\n        market.assertMarketParamsValid();\n        _;\n    }\n\n    function registerMarket(LibMarket.Market market) public onlyOwner marketValid(market) {\n        bytes32 marketHash = market.getMarketHash();\n        markets[marketHash] = true;\n        hashToMarket[marketHash] = market;\n\n        emit MarketRegistered(\n            market.startDate,\n            market.expiryDate,\n            market.referenceEntity,\n            marketHash\n        );\n    }\n\n    function unregisterMarket(LibMarket.Market market) public onlyOwner {\n        bytes32 marketHash = market.getMarketHash();\n        markets[marketHash] = false;\n        delete hashToMarket[marketHash]; \n\n        emit MarketUnregistered(\n            market.startDate,\n            market.expiryDate,\n            market.referenceEntity,\n            marketHash\n        );\n    }\n\n    function getMarket(bytes32 marketHash) public view returns(LibMarket.Market) {\n        return hashToMarket[marketHash];\n    }\n}",
  "sourcePath": "/home/julian/Desktop/cdx/cdx-contracts/contracts/Registry.sol",
  "ast": {
    "absolutePath": "/home/julian/Desktop/cdx/cdx-contracts/contracts/Registry.sol",
    "exportedSymbols": {
      "Registry": [
        1519
      ]
    },
    "id": 1520,
    "nodeType": "SourceUnit",
    "nodes": [
      {
        "id": 1384,
        "literals": [
          "solidity",
          "0.4",
          ".24"
        ],
        "nodeType": "PragmaDirective",
        "src": "0:23:5"
      },
      {
        "id": 1385,
        "literals": [
          "experimental",
          "ABIEncoderV2"
        ],
        "nodeType": "PragmaDirective",
        "src": "24:33:5"
      },
      {
        "id": 1386,
        "literals": [
          "experimental",
          "v0.5.0"
        ],

[ricmoo]

That certainly looks fine. Can you try:

console.log(registryAbi.abi.forEach)

It should print out “[function]”.

[mrwillis]

Thanks for the help @ricmoo . Works like a charm. Hopefully my code can be instructive to those trying to integrate truffle with ethers.js.

[ricmoo]

Closing this now, but please feel free to re-open if you have any problems.

Thanks! :)

[ajit-soman]

How can i get contract address from a already deployed contract . I have only json file which was generated by truffle.
I want to use that contract address in below code.
var contract = new ethers.Contract("ADDRESS", contractAbi.abi, wallet);

I have tried to pass name of contract but it throws "ERROR: Cannot find Contract - MyToken"

[ricmoo]

I don’t use truffle myself, but there may be some property inside your contractAbi object. Maybe contractAbi.address? Did you use truffle to deploy it?

[ajit-soman]

Thanks for reply

The contract JSON file does not has any address property.

I deployed contract using truffle.

[ricmoo]

When truffle deploys a contract it must output the address somewhere... Sorry, I’m not familiar enough though to know where. Can you include the JSON?

Is this on a public network like Ropsten or mainnet? If so, you can use Etherscan to look up the address.

If it is Ganache, the UI should indicate the address.

[ajit-soman]

Is it possible to retrieve contract address from json file or is there any other way i can create a ethers.Contract object so that i can use its methods.

I have deployed contract in ropsten.
https://ropsten.etherscan.io/address/0x953ca09453c00baab0560aa8384e60b069cd7426

I have attached MyToken.zip file

MyToken.zip

[ricmoo]

In the JSON file you provided, you can access the address using:

let address = myToken.networks["3"].address;

Where the "3" is for Ropsten; for other networks you would need to specify the correct chain ID...

[ajit-soman]

Thanks a lot.

I should have searched contract ABI file with contract address.