Node.js libp2p mDNS discovery implementation for peer discovery
$ npm i @libp2p/mdnsimport { mdns } from '@libp2p/mdns'
const options = {
peerDiscovery: [
mdns()
]
}
async function start () {
const libp2p = await createLibp2p(options)
libp2p.on('peer:discovery', function (peerId) {
console.log('found peer: ', peerId.toB58String())
})
await libp2p.start()
}- options
peerName- Peer name to announce (should not be peeer id), default random stringmultiaddrs- multiaddrs to announcebroadcast- (true/false) announce our presence through mDNS, defaultfalseinterval- query interval, default 10 * 1000 (10 seconds)serviceTag- name of the service announce , default 'ipfs.local`
A query is sent to discover the IPFS nodes on the local network
{
type: 'query',
questions: [ { name: 'ipfs.local', type: 'PTR' } ]
}When a query is detected, each IPFS node sends an answer about itself
[ { name: 'ipfs.local',
type: 'PTR',
class: 'IN',
ttl: 120,
data: 'QmNPubsDWATVngE3d5WDSNe7eVrFLuk38qb9t6vdLnu2aK.ipfs.local' },
{ name: 'QmNPubsDWATVngE3d5WDSNe7eVrFLuk38qb9t6vdLnu2aK.ipfs.local',
type: 'SRV',
class: 'IN',
ttl: 120,
data:
{ priority: 10,
weight: 1,
port: '20002',
target: 'LAPTOP-G5LJ7VN9' } },
{ name: 'QmNPubsDWATVngE3d5WDSNe7eVrFLuk38qb9t6vdLnu2aK.ipfs.local',
type: 'TXT',
class: 'IN',
ttl: 120,
data: ['QmNPubsDWATVngE3d5WDSNe7eVrFLuk38qb9t6vdLnu2aK'] },
{ name: 'LAPTOP-G5LJ7VN9',
type: 'A',
class: 'IN',
ttl: 120,
data: '127.0.0.1' },
{ name: 'LAPTOP-G5LJ7VN9',
type: 'AAAA',
class: 'IN',
ttl: 120,
data: '::1' } ]Licensed under either of
- Apache 2.0, (LICENSE-APACHE / http://www.apache.org/licenses/LICENSE-2.0)
- MIT (LICENSE-MIT / http://opensource.org/licenses/MIT)
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.
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