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refactor: examples/peer-and-content-routing (#500)

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* refactor: examples-peer-and-content-routing

* chore: address review

* chore: review suggestions

Co-Authored-By: Jacob Heun <jacobheun@gmail.com>
This commit is contained in:
Vasco Santos
2019-12-18 02:37:36 +00:00
committed by Jacob Heun
parent 835a689965
commit 7b326cc525
3 changed files with 122 additions and 181 deletions
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120
examples/peer-and-content-routing/2.js
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@ -1,85 +1,61 @@
/* eslint-disable no-console */
'use strict'
const libp2p = require('../../')
const Libp2p = require('../../')
const TCP = require('libp2p-tcp')
const Mplex = require('libp2p-mplex')
const SECIO = require('libp2p-secio')
const PeerInfo = require('peer-info')
const CID = require('cids')
const KadDHT = require('libp2p-kad-dht')
const defaultsDeep = require('@nodeutils/defaults-deep')
const waterfall = require('async/waterfall')
const parallel = require('async/parallel')
class MyBundle extends libp2p {
constructor (_options) {
const defaults = {
modules: {
transport: [ TCP ],
streamMuxer: [ Mplex ],
connEncryption: [ SECIO ],
// we add the DHT module that will enable Peer and Content Routing
dht: KadDHT
},
config: {
dht: {
enabled: true,
kBucketSize: 20
}
const all = require('it-all')
const delay = require('delay')
const createNode = async () => {
const peerInfo = await PeerInfo.create()
peerInfo.multiaddrs.add('/ip4/0.0.0.0/tcp/0')
const node = await Libp2p.create({
peerInfo,
modules: {
transport: [TCP],
streamMuxer: [Mplex],
connEncryption: [SECIO],
dht: KadDHT
},
config: {
dht: {
enabled: true
}
}
super(defaultsDeep(_options, defaults))
}
}
function createNode (callback) {
let node
waterfall([
(cb) => PeerInfo.create(cb),
(peerInfo, cb) => {
peerInfo.multiaddrs.add('/ip4/0.0.0.0/tcp/0')
node = new MyBundle({
peerInfo
})
node.start(cb)
}
], (err) => callback(err, node))
}
parallel([
(cb) => createNode(cb),
(cb) => createNode(cb),
(cb) => createNode(cb)
], (err, nodes) => {
if (err) { throw err }
const node1 = nodes[0]
const node2 = nodes[1]
const node3 = nodes[2]
parallel([
(cb) => node1.dial(node2.peerInfo, cb),
(cb) => node2.dial(node3.peerInfo, cb),
// Set up of the cons might take time
(cb) => setTimeout(cb, 300)
], (err) => {
if (err) { throw err }
const cid = new CID('QmTp9VkYvnHyrqKQuFPiuZkiX9gPcqj6x5LJ1rmWuSySnL')
node1.contentRouting.provide(cid, (err) => {
if (err) { throw err }
console.log('Node %s is providing %s', node1.peerInfo.id.toB58String(), cid.toBaseEncodedString())
node3.contentRouting.findProviders(cid, 5000, (err, providers) => {
if (err) { throw err }
console.log('Found provider:', providers[0].id.toB58String())
})
})
})
})
await node.start()
return node
}
;(async () => {
const [node1, node2, node3] = await Promise.all([
createNode(),
createNode(),
createNode()
])
await Promise.all([
node1.dial(node2.peerInfo),
node2.dial(node3.peerInfo)
])
const cid = new CID('QmTp9VkYvnHyrqKQuFPiuZkiX9gPcqj6x5LJ1rmWuSySnL')
await node1.contentRouting.provide(cid)
console.log('Node %s is providing %s', node1.peerInfo.id.toB58String(), cid.toBaseEncodedString())
// wait for propagation
await delay(300)
const providers = await all(node3.contentRouting.findProviders(cid, { timeout: 3000 }))
console.log('Found provider:', providers[0].id.toB58String())
})();