@parity/api

@parity/api

Parity.js is a thin, fast, Promise-based wrapper around the Ethereum APIs.

installation

Install the package with npm install --save @parity/api

usage

initialisation

// import the actual Api class
import Api from '@parity/api';

// do the setup
const provider = new Api.Provider.Http('http://localhost:8545');
const api = new Api(provider);

making calls

perform a call

api.eth.coinbase().then(coinbase => {
  console.log(`The coinbase is ${coinbase}`);
});

multiple promises

Promise.all([api.eth.coinbase(), api.net.listening()]).then(
  ([coinbase, listening]) => {
    // do stuff here
  }
);

chaining promises

api.eth
  .newFilter({...})
  .then((filterId) => api.eth.getFilterChanges(filterId))
  .then((changes) => {
    console.log(changes);
  });

contracts

attach contract

const abi = [{ name: 'callMe', inputs: [{ type: 'bool', ...}, { type: 'string', ...}]}, ...abi...];
const address = '0x123456...9abc';
const contract = api.newContract(abi, address);

find & call a function

contract.instance.callMe
  .call({ gas: 21000 }, [true, 'someString']) // or estimateGas or postTransaction
  .then(result => {
    console.log(`the result was ${result}`);
  });

apis

APIs implement the calls as exposed in the Ethcore JSON Ethereum RPC definitions. Mapping follows the naming conventions of the originals, i.e. eth_call becomes eth.call, personal_accounts becomes personal.accounts, etc.

public node

For operation within a public node, the following peerDependencies needs to be added (this functionality will be moved shortly) -