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@openzeppelin/contract-loader

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    @openzeppelin/contract-loader

Load contract ABIs from built artifacts and return contract objects


Version published
Weekly downloads
13K
decreased by-4.16%
Maintainers
3
Install size
306 kB
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Weekly downloads
 

Changelog

Source

0.6.3 (2021-08-20)

  • Remove default gas price, for compatibility with the London hard fork.

Readme

Source

OpenZeppelin Contract Loader

Docs NPM Package Build Status

Load contract objects from built artifacts or ABIs. Includes support for both web3-eth-contract and @truffle/contract objects.

const { setupLoader } = require('@openzeppelin/contract-loader');
const loader = setupLoader({ provider: new Web3('http://localhost:8545') }).web3;

const address = '0xCfEB869F69431e42cdB54A4F4f105C19C080A601';
const erc20 = loader.fromArtifact('ERC20', address);

const totalSupply = await token.methods.totalSupply().call();

Overview

Installation

npm install @openzeppelin/contract-loader

You may also need to install web3-eth-contract or @truffle/contract, depending on which abstractions you want to be able to load.

Contract Loader requires access to the filesystem to read contract ABIs. Because of this, it will not work in a browser-based Dapp.

Usage

Create a loader object:

const { setupLoader } = require('@openzeppelin/contract-loader');

const loader = setupLoader({
  provider,      // either a web3 provider or a web3 instance
  defaultSender, // optional
  defaultGas,    // optional, defaults to 8 million
});

Load web3 contracts:

const ERC20 = loader.web3.fromArtifact('ERC20');

// Deploy contract
const token = await ERC20.deploy().send();

// Send transactions and query state
const balance = await token.methods.balanceOf(sender).call();
await token.methods.transfer(receiver, balance).send({ from: sender });

Load Truffle contracts:

const ERC20 = loader.truffle.fromArtifact('ERC20');

// Deploy contract
const token = await ERC20.new();

// Send transactions and query state
const balance = await token.balanceOf(sender);
await token.transfer(receiver, balance, { from: sender });

Learn More

  • For detailed usage information, take a look at the API Reference.

License

MIT.

Keywords

FAQs

Last updated on 20 Aug 2021

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