js-libp2p-gossipsub

Lead Maintainer

Cayman Nava

Table of Contents

• Specs
• Install
• Usage
• API
• Contribute
• License

Specs

Gossipsub is an implementation of pubsub based on meshsub and floodsub. You can read the specification here.

libp2p-gossipsub currently implements the v1.1 of the spec.

Install

npm install libp2p-gossipsub

Usage

const Gossipsub = require('libp2p-gossipsub')

const gsub = new Gossipsub(libp2p, options)

await gsub.start()

gsub.on('fruit', (data) => {
  console.log(data)
})
gsub.subscribe('fruit')

gsub.publish('fruit', new TextEncoder().encode('banana'))

API

Create a gossipsub implementation

const options = {…}
const gossipsub = new Gossipsub(libp2p, options)

Options is an optional object with the following key-value pairs:

• emitSelf: boolean identifying whether the node should emit to self on publish, in the event of the topic being subscribed (defaults to false).
• gossipIncoming: boolean identifying if incoming messages on a subscribed topic should be automatically gossiped (defaults to true).
• fallbackToFloodsub: boolean identifying whether the node should fallback to the floodsub protocol, if another connecting peer does not support gossipsub (defaults to true).
• floodPublish: boolean identifying if self-published messages should be sent to all peers, (defaults to true).
• doPX: boolean identifying whether PX is enabled; this should be enabled in bootstrappers and other well connected/trusted nodes (defaults to false).
• msgIdFn: a function with signature (message) => string defining the message id given a message, used internally to deduplicate gossip (defaults to (message) => message.from + message.seqno.toString('hex'))
• messageCache: optional, a customized MessageCache instance, see the implementation for the interface.
• scoreParams: optional, a customized peer score parameters Object.
• scoreThresholds: optional, a customized peer score thresholds Object.
• directPeers: optional, an array of AddrInfo of peers with which we will maintain direct connections.

For the remaining API, see https://github.com/libp2p/js-libp2p-pubsub

Contribute

This module is actively under development. Please check out the issues and submit PRs!

License

MIT © ChainSafe Systems