User Guide

December 14, 2016 ยท View on GitHub

All information for developers using ethjs-provider-signer should consult this document.

Install

npm install --save ethjs-provider-signer

Usage

const SignerProvider = require('ethjs-provider-signer');
const sign = require('ethjs-signer').sign;
const Eth = require('ethjs-query');
const provider = new SignerProvider('https://ropsten.infura.io', {
  signTransaction: (rawTx, cb) => cb(null, sign(rawTx, '0x...privateKey...')),
});
const eth = new Eth(provider);

eth.sendTransaction({
  from: '0x407d73d8a49eeb85d32cf465507dd71d507100c1',
  gas: 300000,
  data: '0x...',
}, cb);

// results null 0x... (transaction hash)

API Design

constructor

index.js:ethjs-provider-signer

Intakes a provider URL specified as a string, and an options object where the privateKey method is specified.

Parameters

  • provider String the URL path to your local Http RPC enabled Ethereum node (e.g. http://localhost:8545) or a service node system like Infura.io (e.g. http://ropsten.infura.io).
  • options Object the options object where the signTransaction method and timeout property is specified.

Example options Object:

const options = {
  signTransaction: (rawTx, cb) => {
    if (rawTx.from === '0x...') {
      cb(null, sign(rawTx, '0x...privateKey...'));
    } else {
      cb('some error');
    }
  },
  timeout: 400,
};

Result SignerProvider Object.

const SignerProvider = require('ethjs-provider-signer');
const Eth = require('ethjs-query');
const eth = new Eth(new SignerProvider('http://ropsten.infura.io', {
  signTransaction: (rawTx, cb) => cb(null, SignerProvider.sign(rawTx, '0x...privateKey...')),
}));

eth.sendTransaction({
  from: '0x407d73d8a49eeb85d32cf465507dd71d507100c1',
  gas: 300000,
  data: '0x...',
}, cb);

// results null 0x... (transaction hash)

Browser Builds

ethjs provides production distributions for all of its modules that are ready for use in the browser right away. Simply include either dist/ethjs-provider-signer.js or dist/ethjs-provider-signer.min.js directly into an HTML file to start using this module. Note, an SignerProvider object is made available globally.

<script type="text/javascript" src="ethjs-provider-signer.min.js"></script>
<script type="text/javascript">
new SignerProvider(...);
</script>

Note, even though ethjs should have transformed and polyfilled most of the requirements to run this module across most modern browsers. You may want to look at an additional polyfill for extra support.

Use a polyfill service such as Polyfill.io to ensure complete cross-browser support: https://polyfill.io/

Webpack Figures

Hash: f8ea69e4b882307e0d88                                                         
Version: webpack 2.1.0-beta.15
Time: 144ms
                       Asset     Size  Chunks             Chunk Names
    ethjs-provider-signer.js  7.99 kB       0  [emitted]  main
ethjs-provider-signer.js.map  9.27 kB       0  [emitted]  main
   [0] ./lib/index.js 2.45 kB {0} [built]
   [3] multi main 28 bytes {0} [built]
    + 2 hidden modules

                       Asset     Size  Chunks             Chunk Names
ethjs-provider-signer.min.js  3.42 kB       0  [emitted]  main
   [0] ./lib/index.js 2.45 kB {0} [built]
       [3] 1ms -> factory:16ms building:38ms = 55ms
   [3] multi main 28 bytes {0} [built]
       factory:0ms building:1ms = 1ms
    + 2 hidden modules

Other Awesome Modules, Tools and Frameworks

  • web3.js -- the original Ethereum swiss army knife Ethereum Foundation
  • ethereumjs -- critical ethereumjs infrastructure Ethereum Foundation
  • browser-solidity -- an in browser Solidity IDE Ethereum Foundation
  • wafr -- a super simple Solidity testing framework
  • truffle -- a solidity/js dApp framework
  • embark -- a solidity/js dApp framework
  • dapple -- a solidity dApp framework
  • chaitherium -- a JS web3 unit testing framework
  • contest -- a JS testing framework for contracts

Our Relationship with Ethereum & EthereumJS

We would like to mention that we are not in any way affiliated with the Ethereum Foundation or ethereumjs. However, we love the work they do and work with them often to make Ethereum great! Our aim is to support the Ethereum ecosystem with a policy of diversity, modularity, simplicity, transparency, clarity, optimization and extensibility.

Many of our modules use code from web3.js and the ethereumjs- repositories. We thank the authors where we can in the relevant repositories. We use their code carefully, and make sure all test coverage is ported over and where possible, expanded on.