Deploy Smarts Contracts with imports by a local compiler

Smart Contracts Developer Wanted
,
1

Hi there.
I'm trying to create, compile and deploy smart contracts from an Angular project and I'm using a smart contract which import OpenZeppelin smart contracts like ( @openzeppelin/contracts/token/ERC20/ERC20.sol, @openzeppelin/contracts/security/Pausable.sol or @openzeppelin/contracts/access/Ownable.sol). But, for compile it I have to pass the smart contract as a string parameter between " `` " to the compiler . Because of that if I pass the smart contract incluiding the imports the compiler doesn't find it, even having the openzeppelin folder in the node modules of the Angular project.

I don't know if I explained it well enough to understand the problem, but if I did and someone can help me, I would really appreciate it.

I also attach the file where I pass the smart contract to the compiler in case it helps:

import { Component } from '@angular/core';
import { solidityCompiler, getCompilerVersions } from '@agnostico/browser-solidity-compiler';

@Component({
  selector: 'app-root',
  templateUrl: 'app.component.html',
  styleUrls: ['app.component.css']
})

export class AppComponent {

  version: string = 'soljson-v0.8.19+commit.7dd6d404.js'

  constructor() {
  }

  ngOnInit() {

    (async () => {
      let result = await this.compiler();
      console.log("RESULT: \n" + JSON.stringify(result));
    })();
  }

  /*async getVersions() {
    let resultVersions = await getCompilerVersions();
    console.log("Result1 " + JSON.stringify(resultVersions));
  }*/

  async compiler() {
    let compilerResponse = await solidityCompiler({
      version: `https://binaries.soliditylang.org/bin/${this.version}`,

      contractBody: 
      `// SPDX-License-Identifier: MIT
      pragma solidity ^0.8.9;

      import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
      import "@openzeppelin/contracts/security/Pausable.sol";
      import "@openzeppelin/contracts/access/Ownable.sol";

      contract KHCoin is ERC20, Pausable, Ownable {
        
          constructor() ERC20("KHCoin", "KHC") {
              _mint(msg.sender, 10000 * 10 ** decimals());
          }


          function mint(address to, uint256 amount) public onlyOwner {
              _mint(to, amount);
          }


          function burn(uint256 amount) public onlyOwner {
              _burn(_msgSender(), amount);
          }


          function burnFrom(address account, uint256 amount) public onlyOwner {
              _burn(account, amount);
          }


          function pause() public onlyOwner {
              _pause();
          }


          function unpause() public onlyOwner {
              _unpause();
          }


          function _beforeTokenTransfer(address from, address to, uint256 amount)
              internal
              whenNotPaused
              override
          {
              super._beforeTokenTransfer(from, to, amount);
          }
      }`
    });

    return compilerResponse;
  }
}

Thanks a million :slight_smile:

2

Indeed, the example on their GitHub repository does not included any import statement as part of the source code being tested:

    `
    contract C { 
      function f() public { } 
    }

    contract D {
      function g() public { }
    }
    `

So perhaps they do not support this (a bit weird, but who knows).
Try to flatten the source code before pasting it into your script...

4

First of all thanks for your answer. Yes, I saw that part of the github repository and tried to flatten it with remix, but I don't know if it kept giving me an error because of the length, I'm going to try to flatten it manually, which will take me a long time but maybe it's profitable.

Thanks again

1 Like
5

have you resolved the issues? If not, I can help you.

6

I think I did. I flatterned the smart contract and It's working, but idk if it's the optimal solution.