eosio-history-demux v0.1.1

eosio-history-demux

Demux is a backend infrastructure pattern for sourcing blockchain events to deterministically update queryable datastores and trigger side effects. (https://github.com/EOSIO/demux-js)

This library provides efficient implementation of demux pattern using History API.

Install

$ npm install eosio-history-demux

Example

const { createClient, createReducer } = require('eosio-history-demux')

const httpEndpoint = 'https://api.eos.miami'

const client = createClient(httpEndpoint)

const reducer = createReducer({
    client,
    contractName: 'eosio.msig',
    fromAction: 0, // number of action in history (optional)
    batchSize: 64, // number of actions per request (optional)
    handlers: {
      // actions are processed sequentially, therefore handlers can depend on data indexed by previous handler
      'propose': async (transaction) => console.log(`new proposal at action #${transaction.account_action_seq}`),
      'approve': async (transaction) => console.log(`new approval at action #${transaction.account_action_seq}`)
    }
})