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index.node.js
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index.node.js
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'use strict'
/* eslint-env mocha */
const chai = require('chai')
chai.use(require('dirty-chai'))
const defer = require('p-defer')
const mergeOptions = require('merge-options')
const Bootstrap = require('libp2p-bootstrap')
const crypto = require('libp2p-crypto')
const KadDht = require('libp2p-kad-dht')
const MulticastDNS = require('libp2p-mdns')
const multiaddr = require('multiaddr')
const Libp2p = require('../../src')
const baseOptions = require('../utils/base-options')
const { createPeerInfo } = require('../utils/creators/peer')
describe('peer discovery scenarios', () => {
let peerInfo, remotePeerInfo1, remotePeerInfo2
let libp2p
before(async () => {
[peerInfo, remotePeerInfo1, remotePeerInfo2] = await createPeerInfo({ number: 3 })
peerInfo.multiaddrs.add(multiaddr('/ip4/127.0.0.1/tcp/0'))
remotePeerInfo1.multiaddrs.add(multiaddr('/ip4/127.0.0.1/tcp/0'))
remotePeerInfo2.multiaddrs.add(multiaddr('/ip4/127.0.0.1/tcp/0'))
})
afterEach(async () => {
libp2p && await libp2p.stop()
})
it('bootstrap should discover all peers in the list', async () => {
const deferred = defer()
const bootstrappers = [
...remotePeerInfo1.multiaddrs.toArray().map((ma) => `${ma}/p2p/${remotePeerInfo1.id.toB58String()}`),
...remotePeerInfo2.multiaddrs.toArray().map((ma) => `${ma}/p2p/${remotePeerInfo2.id.toB58String()}`)
]
libp2p = new Libp2p(mergeOptions(baseOptions, {
peerInfo,
modules: {
peerDiscovery: [Bootstrap]
},
config: {
peerDiscovery: {
autoDial: false,
bootstrap: {
enabled: true,
list: bootstrappers
}
}
}
}))
const expectedPeers = new Set([
remotePeerInfo1.id.toB58String(),
remotePeerInfo2.id.toB58String()
])
libp2p.on('peer:discovery', (peerInfo) => {
expectedPeers.delete(peerInfo.id.toB58String())
if (expectedPeers.size === 0) {
libp2p.removeAllListeners('peer:discovery')
deferred.resolve()
}
})
await libp2p.start()
return deferred.promise
})
it('MulticastDNS should discover all peers on the local network', async () => {
const deferred = defer()
const getConfig = (peerInfo) => mergeOptions(baseOptions, {
peerInfo,
modules: {
peerDiscovery: [MulticastDNS]
},
config: {
peerDiscovery: {
autoDial: false,
mdns: {
enabled: true,
interval: 200, // discover quickly
// use a random tag to prevent CI collision
serviceTag: crypto.randomBytes(10).toString('hex')
}
}
}
})
libp2p = new Libp2p(getConfig(peerInfo))
const remoteLibp2p1 = new Libp2p(getConfig(remotePeerInfo1))
const remoteLibp2p2 = new Libp2p(getConfig(remotePeerInfo2))
const expectedPeers = new Set([
remotePeerInfo1.id.toB58String(),
remotePeerInfo2.id.toB58String()
])
libp2p.on('peer:discovery', (peerInfo) => {
expectedPeers.delete(peerInfo.id.toB58String())
if (expectedPeers.size === 0) {
libp2p.removeAllListeners('peer:discovery')
deferred.resolve()
}
})
await Promise.all([
remoteLibp2p1.start(),
remoteLibp2p2.start(),
libp2p.start()
])
await deferred.promise
await remoteLibp2p1.stop()
await remoteLibp2p2.stop()
})
it('kad-dht should discover other peers', async () => {
const deferred = defer()
const getConfig = (peerInfo) => mergeOptions(baseOptions, {
peerInfo,
modules: {
dht: KadDht
},
config: {
peerDiscovery: {
autoDial: false
},
dht: {
randomWalk: {
enabled: true,
delay: 1000, // start the first query quickly
interval: 10000,
timeout: 1000
},
enabled: true
}
}
})
libp2p = new Libp2p(getConfig(peerInfo))
const remoteLibp2p1 = new Libp2p(getConfig(remotePeerInfo1))
const remoteLibp2p2 = new Libp2p(getConfig(remotePeerInfo2))
libp2p.on('peer:discovery', (peerInfo) => {
if (peerInfo.id.toB58String() === remotePeerInfo2.id.toB58String()) {
libp2p.removeAllListeners('peer:discovery')
deferred.resolve()
}
})
await Promise.all([
remoteLibp2p1.start(),
remoteLibp2p2.start()
])
// Topology:
// A -> B
// C -> B
await Promise.all([
libp2p.dial(remotePeerInfo1),
remoteLibp2p2.dial(remotePeerInfo1)
])
libp2p.start()
await deferred.promise
return Promise.all([
remoteLibp2p1.stop(),
remoteLibp2p2.stop()
])
})
})