js-libp2p-gossipsub

js-libp2p-gossipsub

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 @chainsafe/libp2p-gossipsub

Usage

import { gossipsub } from '@chainsafe/libp2p-gossipsub'


const libp2p = await createLibp2p({
  // ...
  services: {
    pubsub: gossipsub(options)
  }
});

libp2p.services.pubsub.addEventListener('message', (message) => {
  console.log(`${message.detail.topic}:`, new TextDecoder().decode(message.detail.data))
})

libp2p.services.pubsub.subscribe('fruit')

libp2p.services.pubsub.publish('fruit', new TextEncoder().encode('banana'))

API

Create a gossipsub implementation

const options = {…}
const gossipsub = gossipsub(options)(libp2p)

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'))
signMessages: boolean identifying if we want to sign outgoing messages or not (default: true)
strictSigning: boolean identifying if message signing is required for incoming messages or not (default: true)
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.