mirror of
https://github.com/fluencelabs/js-libp2p
synced 2025-03-16 15:40:49 +00:00
refactor: examples/discovery-mechanisms (#498)
* refactor: examples-discovery-mechanisms * chore: apply suggestions from code review Co-Authored-By: Jacob Heun <jacobheun@gmail.com> * chore: suggestion interval Co-Authored-By: Jacob Heun <jacobheun@gmail.com> * chore: add peer connected event Co-authored-by: Jacob Heun <jacobheun@gmail.com>
This commit is contained in:
parent
ba4681b312
commit
efc96c2f19
@ -1,14 +1,11 @@
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/* eslint-disable no-console */
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'use strict'
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const libp2p = require('../../')
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const Libp2p = require('../../')
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const TCP = require('libp2p-tcp')
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const Mplex = require('libp2p-mplex')
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const SECIO = require('libp2p-secio')
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const PeerInfo = require('peer-info')
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const Bootstrap = require('libp2p-bootstrap')
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const waterfall = require('async/waterfall')
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const defaultsDeep = require('@nodeutils/defaults-deep')
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// Find this list at: https://github.com/ipfs/js-ipfs/blob/master/src/core/runtime/config-nodejs.json
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const bootstrapers = [
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@ -23,51 +20,35 @@ const bootstrapers = [
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'/ip4/104.236.151.122/tcp/4001/p2p/QmSoLju6m7xTh3DuokvT3886QRYqxAzb1kShaanJgW36yx'
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]
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class MyBundle extends libp2p {
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constructor (_options) {
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const defaults = {
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modules: {
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transport: [ TCP ],
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streamMuxer: [ Mplex ],
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connEncryption: [ SECIO ],
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peerDiscovery: [ Bootstrap ]
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},
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config: {
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peerDiscovery: {
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autoDial: true,
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bootstrap: {
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interval: 20e3,
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enabled: true,
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list: bootstrapers
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}
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;(async () => {
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const node = await Libp2p.create({
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modules: {
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transport: [TCP],
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streamMuxer: [Mplex],
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connEncryption: [SECIO],
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peerDiscovery: [Bootstrap]
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},
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config: {
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peerDiscovery: {
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bootstrap: {
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interval: 60e3,
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enabled: true,
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list: bootstrapers
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}
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}
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}
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})
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super(defaultsDeep(_options, defaults))
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}
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}
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node.peerInfo.multiaddrs.add('/ip4/0.0.0.0/tcp/0')
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let node
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waterfall([
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(cb) => PeerInfo.create(cb),
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(peerInfo, cb) => {
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peerInfo.multiaddrs.add('/ip4/0.0.0.0/tcp/0')
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node = new MyBundle({
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peerInfo
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})
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node.start(cb)
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}
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], (err) => {
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if (err) { throw err }
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node.on('peer:connect', (peer) => {
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console.log('Connection established to:', peer.id.toB58String()) // Emitted when a peer has been found
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})
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node.on('peer:discovery', (peer) => {
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// No need to dial, autoDial is on
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console.log('Discovered:', peer.id.toB58String())
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})
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node.on('peer:connect', (peer) => {
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console.log('Connection established to:', peer.id.toB58String())
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})
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})
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await node.start()
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})();
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@ -1,63 +1,45 @@
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/* eslint-disable no-console */
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'use strict'
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const libp2p = require('../../')
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const Libp2p = require('../../')
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const TCP = require('libp2p-tcp')
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const Mplex = require('libp2p-mplex')
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const SECIO = require('libp2p-secio')
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const PeerInfo = require('peer-info')
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const MulticastDNS = require('libp2p-mdns')
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const waterfall = require('async/waterfall')
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const parallel = require('async/parallel')
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const defaultsDeep = require('@nodeutils/defaults-deep')
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class MyBundle extends libp2p {
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constructor (_options) {
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const defaults = {
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modules: {
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transport: [ TCP ],
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streamMuxer: [ Mplex ],
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connEncryption: [ SECIO ],
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peerDiscovery: [ MulticastDNS ]
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},
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config: {
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peerDiscovery: {
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mdns: {
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interval: 20e3,
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enabled: true
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}
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const createNode = async () => {
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const node = await Libp2p.create({
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modules: {
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transport: [TCP],
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streamMuxer: [Mplex],
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connEncryption: [SECIO],
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peerDiscovery: [MulticastDNS]
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},
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config: {
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peerDiscovery: {
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mdns: {
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interval: 20e3,
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enabled: true
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}
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}
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}
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})
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node.peerInfo.multiaddrs.add('/ip4/0.0.0.0/tcp/0')
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super(defaultsDeep(_options, defaults))
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}
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return node
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}
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function createNode (callback) {
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let node
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waterfall([
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(cb) => PeerInfo.create(cb),
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(peerInfo, cb) => {
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peerInfo.multiaddrs.add('/ip4/0.0.0.0/tcp/0')
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node = new MyBundle({
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peerInfo
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})
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node.start(cb)
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}
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], (err) => callback(err, node))
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}
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parallel([
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(cb) => createNode(cb),
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(cb) => createNode(cb)
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], (err, nodes) => {
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if (err) { throw err }
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const node1 = nodes[0]
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const node2 = nodes[1]
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;(async () => {
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const [node1, node2] = await Promise.all([
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createNode(),
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createNode()
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])
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node1.on('peer:discovery', (peer) => console.log('Discovered:', peer.id.toB58String()))
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node2.on('peer:discovery', (peer) => console.log('Discovered:', peer.id.toB58String()))
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})
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await Promise.all([
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node1.start(),
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node2.start()
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])
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})();
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@ -10,36 +10,32 @@ These mechanisms save configuration and enable a node to operate without any exp
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For this demo, we will connect to IPFS default bootstrapper nodes and so, we will need to support the same set of features those nodes have, that are: TCP, mplex and SECIO. You can see the complete example at [1.js](./1.js).
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First, we create our libp2p bundle.
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First, we create our libp2p node.
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```JavaScript
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const Bootstrap = require('libp2p-railing')
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class MyBundle extends libp2p {
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constructor (peerInfo) {
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const defaults = {
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modules: {
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transport: [ TCP ],
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streamMuxer: [ Mplex ],
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connEncryption: [ SECIO ],
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peerDiscovery: [ Bootstrap ]
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},
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config: {
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peerDiscovery: {
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bootstrap: {
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interval: 2000,
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enabled: true,
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list: bootstrapers
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}
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}
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const Libp2p = require('libp2p')
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const Bootstrap = require('libp2p-bootstrap')
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const node = Libp2p.create({
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modules: {
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transport: [ TCP ],
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streamMuxer: [ Mplex ],
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connEncryption: [ SECIO ],
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peerDiscovery: [ Bootstrap ]
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},
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config: {
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peerDiscovery: {
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bootstrap: {
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interval: 60e3,
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enabled: true,
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list: bootstrapers
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}
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}
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super(defaultsDeep(_options, defaults))
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}
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}
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})
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```
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In this bundle, we use a `bootstrappers` array listing peers to connect _on boot_. Here is the list used by js-ipfs and go-ipfs.
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In this configuration, we use a `bootstrappers` array listing peers to connect _on boot_. Here is the list used by js-ipfs and go-ipfs.
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```JavaScript
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const bootstrapers = [
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@ -58,34 +54,37 @@ const bootstrapers = [
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Now, once we create and start the node, we can listen for events such as `peer:discovery` and `peer:connect`, these events tell us when we found a peer, independently of the discovery mechanism used and when we actually dialed to that peer.
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```JavaScript
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let node
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waterfall([
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(cb) => PeerInfo.create(cb),
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(peerInfo, cb) => {
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peerInfo.multiaddrs.add('/ip4/0.0.0.0/tcp/0')
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node = new MyBundle({
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peerInfo
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})
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node.start(cb)
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const node = await Libp2p.create({
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peerInfo,
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modules: {
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transport: [ TCP ],
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streamMuxer: [ Mplex ],
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connEncryption: [ SECIO ],
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peerDiscovery: [ Bootstrap ]
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},
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config: {
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peerDiscovery: {
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bootstrap: {
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interval: 60e3,
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enabled: true,
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list: bootstrapers
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}
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}
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}
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], (err) => {
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if (err) { throw err }
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// Emitted when a peer has been found
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node.on('peer:discovery', (peer) => {
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console.log('Discovered:', peer.id.toB58String())
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// Note how we need to dial, even if just to warm up the Connection (by not
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// picking any protocol) in order to get a full Connection. The Peer Discovery
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// doesn't make any decisions for you.
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node.dial(peer, () => {})
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})
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// Once the dial is complete, this event is emitted.
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node.on('peer:connect', (peer) => {
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console.log('Connection established to:', peer.id.toB58String())
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})
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})
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node.peerInfo.multiaddrs.add('/ip4/0.0.0.0/tcp/0')
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node.on('peer:connect', (peer) => {
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console.log('Connection established to:', peer.id.toB58String()) // Emitted when a peer has been found
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})
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// Emitted when a peer has been found
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node.on('peer:discovery', (peer) => {
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console.log('Discovered:', peer.id.toB58String())
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})
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await node.start()
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```
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From running [1.js](./1.js), you should see the following:
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@ -101,76 +100,56 @@ Discovered: QmSoLV4Bbm51jM9C4gDYZQ9Cy3U6aXMJDAbzgu2fzaDs64
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Discovered: QmSoLer265NRgSp2LA3dPaeykiS1J6DifTC88f5uVQKNAd
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Discovered: QmSoLMeWqB7YGVLJN3pNLQpmmEk35v6wYtsMGLzSr5QBU3
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Discovered: QmSoLju6m7xTh3DuokvT3886QRYqxAzb1kShaanJgW36yx
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Connection established to: QmSoLMeWqB7YGVLJN3pNLQpmmEk35v6wYtsMGLzSr5QBU3
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Connection established to: QmSoLer265NRgSp2LA3dPaeykiS1J6DifTC88f5uVQKNAd
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Connection established to: QmSoLV4Bbm51jM9C4gDYZQ9Cy3U6aXMJDAbzgu2fzaDs64
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Connection established to: QmSoLueR4xBeUbY9WZ9xGUUxunbKWcrNFTDAadQJmocnWm
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Connection established to: QmSoLPppuBtQSGwKDZT2M73ULpjvfd3aZ6ha4oFGL1KrGM
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Connection established to: QmSoLju6m7xTh3DuokvT3886QRYqxAzb1kShaanJgW36yx
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Connection established to: QmaCpDMGvV2BGHeYERUEnRQAwe3N8SzbUtfsmvsqQLuvuJ
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Connection established to: QmSoLnSGccFuZQJzRadHn95W2CrSFmZuTdDWP8HXaHca9z
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Connection established to: QmSoLSafTMBsPKadTEgaXctDQVcqN88CNLHXMkTNwMKPnu
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```
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## 2. MulticastDNS to find other peers in the network
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For this example, we need `libp2p-mdns`, go ahead and `npm install` it. You can find the complete solution at [2.js](./2.js).
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Update your libp2p bundle to include MulticastDNS.
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Update your libp2p configuration to include MulticastDNS.
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```JavaScript
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class MyBundle extends libp2p {
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constructor (peerInfo) {
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const defaults = {
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modules: {
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transport: [ TCP ],
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streamMuxer: [ Mplex ],
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connEncryption: [ SECIO ],
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peerDiscovery: [ MulticastDNS ]
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},
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config: {
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peerDiscovery: {
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mdns: {
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// Run at 1s so we can observe more quickly, default is 10s
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interval: 1000,
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enabled: true
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}
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const Libp2p = require('libp2p')
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const MulticastDNS = require('libp2p-mdns')
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const createNode = () => {
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return Libp2p.create({
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modules: {
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transport: [ TCP ],
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streamMuxer: [ Mplex ],
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connEncryption: [ SECIO ],
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peerDiscovery: [ MulticastDNS ]
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},
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config: {
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peerDiscovery: {
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mdns: {
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interval: 20e3,
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enabled: true
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}
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}
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}
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super(defaultsDeep(_options, defaults))
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}
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})
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}
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```
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To observe it working, spawn two nodes.
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```JavaScript
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parallel([
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(cb) => createNode(cb),
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(cb) => createNode(cb)
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], (err, nodes) => {
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if (err) { throw err }
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const [node1, node2] = await Promise.all([
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createNode(),
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createNode()
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])
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const node1 = nodes[0]
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const node2 = nodes[1]
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node1.on('peer:discovery', (peer) => console.log('Discovered:', peer.id.toB58String()))
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node2.on('peer:discovery', (peer) => console.log('Discovered:', peer.id.toB58String()))
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})
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node1.on('peer:discovery', (peer) => console.log('Discovered:', peer.id.toB58String()))
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node2.on('peer:discovery', (peer) => console.log('Discovered:', peer.id.toB58String()))
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```
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If you run this example, you will see a continuous stream of each peer discovering each other.
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If you run this example, you will see the other peers being discovered.
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```bash
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> node 2.js
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Discovered: QmSSbQpuKrxkoXHm1v4Pi35hPN5hUHMZoBoawEs2Nhvi8m
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Discovered: QmRcXXhtG8vTqwVBRonKWtV4ovDoC1Fe56WYtcrw694eiJ
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Discovered: QmSSbQpuKrxkoXHm1v4Pi35hPN5hUHMZoBoawEs2Nhvi8m
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Discovered: QmRcXXhtG8vTqwVBRonKWtV4ovDoC1Fe56WYtcrw694eiJ
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Discovered: QmSSbQpuKrxkoXHm1v4Pi35hPN5hUHMZoBoawEs2Nhvi8m
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Discovered: QmRcXXhtG8vTqwVBRonKWtV4ovDoC1Fe56WYtcrw694eiJ
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```
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## 3. Where to find other Peer Discovery Mechanisms
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