Chainlink 101 Course

#42

@thecil, Awesome that did it , thanks buddy. :vulcan_salute:

1 Like
#43

@thecil, Man, just when I think I’m in the clear, lol. I’m having the HDWalletProvider issue again,

I’m trying to deploy lottery contract, I’ve setup Mnemonic, RPC_Url, but error keeps popping up like last time in truffle section of pervious course.

Error: Unknown arguments format passed to new HDWalletProvider. Please check your configuration and try again
    at Object.getOptions (C:\Users\jflor\Documents\Solidity-Lottery\node_modules\@truffle\hdwallet-provider\src\constructor\getOptions.ts:143:11)      
    at new HDWalletProvider (C:\Users\jflor\Documents\Solidity-Lottery\node_modules\@truffle\hdwallet-provider\src\index.ts:68:9)
    at Object.provider (C:\Users\jflor\Documents\Solidity-Lottery\truffle-config.js:28:16)
    at Object.getProvider (C:\Users\jflor\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\provider\index.js:20:1)
    at Object.create (C:\Users\jflor\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\provider\index.js:13:1)
    at TruffleConfig.get [as provider] (C:\Users\jflor\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\config\dist\configDefaults.js:235:1)
    at Object.detect (C:\Users\jflor\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\environment\environment.js:19:1)
    at Object.run (C:\Users\jflor\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\core\lib\commands\migrate.js:201:1)
    at Command.run (C:\Users\jflor\AppData\Roaming\npm\node_modules\truffle\build\webpack:\packages\core\lib\command.js:183:1)

.env file

MNEMONIC='1c49d2330c06ba699edb3ecc24a4f674db2f1b38d7ab699a6d4936..........'
RPC_URL='https://kovan.infura.io/v3/7d82a16ccf554b9a9062...............'

2_deploy.js

const Lottery = artifacts.require('Lottery')
const {LinkToken} = require('@chainlink/contracts/truffle/v0.4/LinkToken')

module.exports = async (deployer, network, [defaultAccount]) => {
    if (!network.startsWith('kovan')){
        console.log('Currently only works with Kovan!')
        LinkToken.setProvider(deployer.provider)
    } else {
        const KOVAN_KEYHASH = '0x6c3699283bda56ad74f6b855546325b68d482e983852a7a82979cc4807b641f4'
        const KOVAN_VRF_COORDINATOR = '0xdD3782915140c8f3b190B5D67eAc6dc5760C46E9'
        const ETH_USD_PRICE_FEED = '0x9326BFA02ADD2366b30bacB125260Af641031331'
        const KOVAN_LINK_TOKEN = '0xa36085F69e2889c224210F603D836748e7dC0088'
        deployer.deploy(Lottery, ETH_USD_PRICE_FEED, KOVAN_VRF_COORDINATOR, KOVAN_LINK_TOKEN, KOVAN_KEYHASH)
        

    }

}

If you can take look for me, Im still trying to put up repository on github, but files to big.
thanks .

#44

I think it might be the hdwalletProvider version, but not that sure, check my package.json which mention the versions of my dependencies, if yours is the same?

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image543×584 8.95 KB

would be awesome if you can provide the github repo, you can use github desktop which will be easier to manage.

https://desktop.github.com/

you can check some videos on youtube on how to create a repo using github desktop, keep in mind that there is no need to upload the node_modules folder, so you can ignore it on the .gitignore file.

WARNING!!! :warning: BE SURE TO NOT UPLOAD YOUR .env FILE TO THE PUBLIC REPO, YOUR PRIV KEY COULD GET COMPROMISE! (just ensure you are also ignoring that file).

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image511×613 6.38 KB

Carlos Z

#45

@thecil, Hi Carlos, thanks for looking into this, Here is my package json,

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image1053×826 59.4 KB

I know in the video he following migrations, he talks about package json config.
Only difference is the truffle assertions.

I’ll started on that desktop github,make this easier, thanks again.

Javier

#46

@thecil, Hi Carlos, here is github link.

https://github.com/TotalingArc/Solidity-Lottery

#47

@thecil Hi Carlos, I am having a hard time compiling the contract because of tis error

Error: Truffle is currently using solc 0.6.6, but one or more of your contracts specify "pragma solidity ^0.8.0".

I believe the reason is because openzeppelin’s Ownable version has to be ^0.8.0 while the video is using ^0.6.6. I tried changing the pragma solidity and truffle-config solidity version to ^0.8.0 but it still complains as the chainlink import is using v0.6. Not too sure what my next step should be.

Appreciate your time, thanks!

1 Like
#48

Hey @jeffersonchoi, hope your well.

If you are using truffle, you might have just to change your truffle compiler version, go into your truffle.config.js, search for compiler version and change it to ^0.8.0.

Carlos Z

#49

Hi @thecil,

Thanks for the reply. I tried changing the truffle.config.js version to ^0.8.0, updated all .sol files which contains ^0.6.6 to ^0.8.0 already, but my compiler is still showing errors.

ParserError: Source file requires different compiler version (current compiler is 0.8.12+commit.f00d7308.Emscripten.clang) - note that nightly builds are considered to be strictly less than the released version
 --> @chainlink/contracts/src/v0.6/vendor/SafeMathChainlink.sol:2:1:
  |
2 | pragma solidity ^0.6.0;

I believe this is because SafeMathChainLink library is still referencing ^0.6.0, as seen from https://github.com/smartcontractkit/chainlink/blob/develop/contracts/src/v0.6/vendor/SafeMathChainlink.sol#L2.

I tried searching in 0.8 directory but was unable to see the SafeMathChainLink file.

Please advice. Thanks!

1 Like
#50

There is a very easy fix, remove the Ownable.sol library and implement your own onlyOwner modifier,

address private _owner;

constructor(...) {
      _owner = msg.sender;
}

modifier onlyOwner {
   ...
  _;
}

This will get rid of the 0.8.0 problem upon compiling