ethereumjs-remote

ethereumjs-remote makes it easy to interact with contracts on the blockchain without running an Ethereum node locally. It converts your function call to a transaction, signs it locally, and sends the signed transaction to your remote provider. All calls to the remote provider are asynchronous.

Install

npm install ethereumjs-remote

Prerequisites

You need to have access to a provider of a remote node. The code has been tested with infura.

Usage

Transaction

const ethereumRemote = require('ethereumjs-remote')
 
// load the contract's ABI, e.g. from the build artifact
const contractBuildArtifact = require('./contract.json')
const contractABI = contractBuildArtifact.abi
 

ethereumRemote.sendTransaction({
  from: '0x43aaE535BE7239c576FA3D152E14b1BC03fF4818',
  privateKey: '*********************************',
  contractAddress: '0x4ab1f10b54915c7324cd4130df90945338f155ad',
  abi: contractABI,
  functionName: 'myFunction',
  functionArguments: [foo, bar],
  provider: https://ropsten.infura.io/a72PYy4LNJBs6BvlszIY
})
.then(txHash => console.log(txHash))
.catch(err => console.log(err))

Message Call

If you want to call a constant function or just want to retrieve a public state variable, then you send a message call like this:

ethereumRemote.call({
  contractAddress: '0x4ab1f10b54915c7324cd4130df90945338f155ad',
  abi: contractABI,
  functionName: 'myPublicVariable',
  functionArguments: [],
  provider: https://ropsten.infura.io/a72PYy4LNJBs6BvlszIY
})
.then(result => console.log(result))
.catch(err => console.log(err))

Documentation

Wiki