Module @libp2p/peer-collections

We can't use PeerIds as collection keys because collection keys are compared using same-value-zero equality, so this is just a group of collections that stringifies PeerIds before storing them.

PeerIds cache stringified versions of themselves so this should be a cheap operation.

Tracked versions are also available which report their current size to the libp2p Metrics collector.

Example: Peer lists

import { peerList } from '@libp2p/peer-collections'
import { peerIdFromPrivateKey } from '@libp2p/peer-id'
import { generateKeyPair } from '@libp2p/crypto/keys'

const peerId = peerIdFromPrivateKey(await generateKeyPair('Ed25519'))

const list = peerList()
list.push(peerId)

Example: Tracked peer lists

import { trackedPeerList } from '@libp2p/peer-collections'
import { peerIdFromPrivateKey } from '@libp2p/peer-id'
import { generateKeyPair } from '@libp2p/crypto/keys'
import { createLibp2p } from 'libp2p'

const libp2p = await createLibp2p()
const peerId = peerIdFromPrivateKey(await generateKeyPair('Ed25519'))

const list = trackedPeerList({ name: 'my_metric_name', metrics: libp2p.metrics })
list.push(peerId)

Example: Peer maps

import { peerMap } from '@libp2p/peer-collections'
import { peerIdFromPrivateKey } from '@libp2p/peer-id'
import { generateKeyPair } from '@libp2p/crypto/keys'

const peerId = peerIdFromPrivateKey(await generateKeyPair('Ed25519'))

const map = peerMap<string>()
map.set(peerId, 'value')

Example: Tracked peer maps

import { trackedPeerMap } from '@libp2p/peer-collections'
import { createLibp2p } from 'libp2p'
import { peerIdFromPrivateKey } from '@libp2p/peer-id'
import { generateKeyPair } from '@libp2p/crypto/keys'

const libp2p = await createLibp2p()
const peerId = peerIdFromPrivateKey(await generateKeyPair('Ed25519'))

const map = trackedPeerMap({ name: 'my_metric_name', metrics: libp2p.metrics })
map.set(peerId, 'value')

Example: Peer sets

import { peerSet } from '@libp2p/peer-collections'
import { peerIdFromPrivateKey } from '@libp2p/peer-id'
import { generateKeyPair } from '@libp2p/crypto/keys'

const peerId = peerIdFromPrivateKey(await generateKeyPair('Ed25519'))

const set = peerSet()
set.add(peerId)

Example: Tracked peer sets

import { trackedPeerSet } from '@libp2p/peer-collections'
import { createLibp2p } from 'libp2p'
import { peerIdFromPrivateKey } from '@libp2p/peer-id'
import { generateKeyPair } from '@libp2p/crypto/keys'

const libp2p = await createLibp2p()
const peerId = peerIdFromPrivateKey(await generateKeyPair('Ed25519'))

const set = trackedPeerSet({ name: 'my_metric_name', metrics: libp2p.metrics })
set.add(peerId)

Example: Peer filters

import { peerFilter } from '@libp2p/peer-collections'
import { peerIdFromPrivateKey } from '@libp2p/peer-id'
import { generateKeyPair } from '@libp2p/crypto/keys'

const peerId = peerIdFromPrivateKey(await generateKeyPair('Ed25519'))

const filter = peerFilter(1024)
filter.has(peerId) // false
filter.add(peerId)
filter.has(peerId) // true