fix!: remove protocols from PeerInfo (#2166)

A [PeerInfo](https://docs.libp2p.io/concepts/fundamentals/peers/#peer-info)
is a libp2p object that combines a PeerID and some Multiaddrs.

We also add a list of protocols. This was a mistake because protocols are
exchanged during Identify but the PeerInfo object is used for peer discovery.

This is evident because we set the protocol list to an empty array everywhere.

PeerInfo is useful for exchanging peer data with other nodes, if we need a
more fleshed-out peer representation we'd use the `Peer` interface from
the peer store.

BREAKING CHANGE: the `.protocols` property has been removed from the `PeerInfo` interface

Author: achingbrain

packages/interface-compliance-tests/src/mocks/peer-discovery.ts

@@ -49,8 +49,7 @@ export class MockDiscovery extends TypedEventEmitter<PeerDiscoveryEvents> implem
           this.safeDispatchEvent<PeerInfo>('peer', {
             detail: {
               id: peerId,
-              multiaddrs: [multiaddr('/ip4/127.0.0.1/tcp/8000')],
-              protocols: []
+              multiaddrs: [multiaddr('/ip4/127.0.0.1/tcp/8000')]
             }
           })
         }, this.options.discoveryDelay ?? 1000)

packages/interface/src/peer-info/index.ts

@@ -1,8 +1,20 @@
 import type { PeerId } from '../peer-id/index.js'
 import type { Multiaddr } from '@multiformats/multiaddr'
 
+/**
+ * A `PeerInfo` is a lightweight object that represents a remote peer, it can be
+ * obtained from peer discovery mechanisms, HTTP RPC endpoints, etc.
+ *
+ * @see https://docs.libp2p.io/concepts/fundamentals/peers/#peer-info
+ */
 export interface PeerInfo {
+  /**
+   * The identifier of the remote peer
+   */
   id: PeerId
+
+  /**
+   * The multiaddrs a peer is listening on
+   */
   multiaddrs: Multiaddr[]
-  protocols: string[]
 }

packages/kad-dht/src/content-routing/index.ts

@@ -64,8 +64,7 @@ export class ContentRouting {
     const msg = new Message(MESSAGE_TYPE.ADD_PROVIDER, key.multihash.bytes, 0)
     msg.providerPeers = [{
       id: this.components.peerId,
-      multiaddrs,
-      protocols: []
+      multiaddrs
     }]
 
     let sent = 0
@@ -140,8 +139,7 @@ export class ContentRouting {
 
           providers.push({
             id: peerId,
-            multiaddrs: peer.addresses.map(({ multiaddr }) => multiaddr),
-            protocols: peer.protocols
+            multiaddrs: peer.addresses.map(({ multiaddr }) => multiaddr)
           })
         } catch (err: any) {
           if (err.code !== 'ERR_NOT_FOUND') {

packages/kad-dht/src/kad-dht.ts

@@ -218,7 +218,7 @@ export class DefaultKadDHT extends TypedEventEmitter<PeerDiscoveryEvents> implem
   }
 
   async onPeerConnect (peerData: PeerInfo): Promise<void> {
-    this.log('peer %p connected with protocols', peerData.id, peerData.protocols)
+    this.log('peer %p connected', peerData.id)
 
     if (this.lan) {
       peerData = removePublicAddresses(peerData)

packages/kad-dht/src/message/index.ts

@@ -104,7 +104,6 @@ function fromPbPeer (peer: PBMessage.Peer): PeerInfo {
 
   return {
     id: peerIdFromBytes(peer.id),
-    multiaddrs: (peer.addrs ?? []).map((a) => multiaddr(a)),
-    protocols: []
+    multiaddrs: (peer.addrs ?? []).map((a) => multiaddr(a))
   }
 }

packages/kad-dht/src/peer-routing/index.ts

@@ -85,8 +85,7 @@ export class PeerRouting {
 
       return {
         id: peerData.id,
-        multiaddrs: peerData.addresses.map((address) => address.multiaddr),
-        protocols: []
+        multiaddrs: peerData.addresses.map((address) => address.multiaddr)
       }
     }
 
@@ -226,8 +225,7 @@ export class PeerRouting {
           from: this.components.peerId,
           peer: {
             id: peerId,
-            multiaddrs: peer.addresses.map(({ multiaddr }) => multiaddr),
-            protocols: peer.protocols
+            multiaddrs: peer.addresses.map(({ multiaddr }) => multiaddr)
           }
         }, options)
       } catch (err: any) {
@@ -296,8 +294,7 @@ export class PeerRouting {
 
         output.push({
           id: peerId,
-          multiaddrs: peer.addresses.map(({ multiaddr }) => multiaddr),
-          protocols: peer.protocols
+          multiaddrs: peer.addresses.map(({ multiaddr }) => multiaddr)
         })
       } catch (err: any) {
         if (err.code !== 'ERR_NOT_FOUND') {

packages/kad-dht/src/rpc/handlers/find-node.ts

@@ -48,8 +48,7 @@ export class FindNodeHandler implements DHTMessageHandler {
     if (uint8ArrayEquals(this.components.peerId.toBytes(), msg.key)) {
       closer = [{
         id: this.components.peerId,
-        multiaddrs: this.components.addressManager.getAddresses().map(ma => ma.decapsulateCode(protocols('p2p').code)),
-        protocols: []
+        multiaddrs: this.components.addressManager.getAddresses().map(ma => ma.decapsulateCode(protocols('p2p').code))
       }]
     } else {
       closer = await this.peerRouting.getCloserPeersOffline(msg.key, peerId)

packages/kad-dht/src/rpc/handlers/get-providers.ts

@@ -86,8 +86,7 @@ export class GetProvidersHandler implements DHTMessageHandler {
 
         const peerAfterFilter = addrFilter({
           id: peerId,
-          multiaddrs: peer.addresses.map(({ multiaddr }) => multiaddr),
-          protocols: peer.protocols
+          multiaddrs: peer.addresses.map(({ multiaddr }) => multiaddr)
         })
 
         if (peerAfterFilter.multiaddrs.length > 0) {

packages/kad-dht/test/kad-utils.spec.ts

@@ -73,7 +73,7 @@ describe('kad utils', () => {
         multiaddr('/dns4/localhost/tcp/4001')
       ]
 
-      const peerInfo = utils.removePrivateAddresses({ id, multiaddrs, protocols: [] })
+      const peerInfo = utils.removePrivateAddresses({ id, multiaddrs })
       expect(peerInfo.multiaddrs.map((ma) => ma.toString()))
         .to.eql(['/dns4/example.com/tcp/4001', '/ip4/1.1.1.1/tcp/4001'])
     })
@@ -90,7 +90,7 @@ describe('kad utils', () => {
         multiaddr('/dns4/localhost/tcp/4001')
       ]
 
-      const peerInfo = utils.removePublicAddresses({ id, multiaddrs, protocols: [] })
+      const peerInfo = utils.removePublicAddresses({ id, multiaddrs })
       expect(peerInfo.multiaddrs.map((ma) => ma.toString()))
         .to.eql(['/ip4/192.168.0.1/tcp/4001', '/dns4/localhost/tcp/4001'])
     })

packages/kad-dht/test/query-self.spec.ts

@@ -78,8 +78,7 @@ describe('Query Self', () => {
         from: remotePeer,
         peer: {
           id: remotePeer,
-          multiaddrs: [],
-          protocols: []
+          multiaddrs: []
         }
       })
     }())
@@ -110,8 +109,7 @@ describe('Query Self', () => {
         from: remotePeer,
         peer: {
           id: remotePeer,
-          multiaddrs: [],
-          protocols: []
+          multiaddrs: []
         }
       })
     }())

packages/kad-dht/test/query.spec.ts

@@ -534,8 +534,7 @@ describe('QueryManager', () => {
         messageType: MESSAGE_TYPE.GET_VALUE,
         closer: [{
           id: peers[2],
-          multiaddrs: [],
-          protocols: []
+          multiaddrs: []
         }]
       })
     }

packages/kad-dht/test/rpc/handlers/add-provider.spec.ts

@@ -68,12 +68,10 @@ describe('rpc - handlers - AddProvider', () => {
 
     msg.providerPeers = [{
       id: peerIds[0],
-      multiaddrs: [ma1],
-      protocols: []
+      multiaddrs: [ma1]
     }, {
       id: peerIds[1],
-      multiaddrs: [ma2],
-      protocols: []
+      multiaddrs: [ma2]
     }]
 
     await handler.handle(peerIds[0], msg)

packages/kad-dht/test/rpc/handlers/find-node.spec.ts

@@ -71,8 +71,7 @@ describe('rpc - handlers - FindNode', () => {
           multiaddr('/ip4/127.0.0.1/tcp/4002'),
           multiaddr('/ip4/192.168.1.5/tcp/4002'),
           multiaddr('/ip4/221.4.67.0/tcp/4002')
-        ],
-        protocols: []
+        ]
       }])
 
     const response = await handler.handle(sourcePeer, msg)
@@ -109,8 +108,7 @@ describe('rpc - handlers - FindNode', () => {
           multiaddr('/ip4/127.0.0.1/tcp/4002'),
           multiaddr('/ip4/192.168.1.5/tcp/4002'),
           multiaddr('/ip4/221.4.67.0/tcp/4002')
-        ],
-        protocols: []
+        ]
       }])
 
     handler = new FindNodeHandler({
@@ -146,8 +144,7 @@ describe('rpc - handlers - FindNode', () => {
           multiaddr('/ip4/127.0.0.1/tcp/4002'),
           multiaddr('/ip4/192.168.1.5/tcp/4002'),
           multiaddr('/ip4/221.4.67.0/tcp/4002')
-        ],
-        protocols: []
+        ]
       }])
 
     const response = await handler.handle(sourcePeer, msg)

packages/kad-dht/test/rpc/handlers/get-providers.spec.ts

@@ -73,8 +73,7 @@ describe('rpc - handlers - GetProviders', () => {
         multiaddr('/ip4/127.0.0.1/tcp/4002'),
         multiaddr('/ip4/192.168.2.6/tcp/4002'),
         multiaddr('/ip4/21.31.57.23/tcp/4002')
-      ],
-      protocols: []
+      ]
     }]
 
     const provider: PeerInfo[] = [{
@@ -83,8 +82,7 @@ describe('rpc - handlers - GetProviders', () => {
         multiaddr('/ip4/127.0.0.1/tcp/4002'),
         multiaddr('/ip4/192.168.1.5/tcp/4002'),
         multiaddr('/ip4/135.4.67.0/tcp/4002')
-      ],
-      protocols: []
+      ]
     }]
 
     providers.getProviders.withArgs(v.cid).resolves([providerPeer])

packages/kad-dht/test/rpc/handlers/get-value.spec.ts

@@ -94,8 +94,7 @@ describe('rpc - handlers - GetValue', () => {
     peerRouting.getCloserPeersOffline.withArgs(key, sourcePeer)
       .resolves([{
         id: closerPeer,
-        multiaddrs: [],
-        protocols: []
+        multiaddrs: []
       }])
 
     const msg = new Message(T, key, 0)

packages/kad-dht/test/utils/test-dht.ts

@@ -94,8 +94,7 @@ export class TestDHT {
       }
 
       components.peerStore.merge(peerData.id, {
-        multiaddrs: peerData.multiaddrs,
-        protocols: peerData.protocols
+        multiaddrs: peerData.multiaddrs
       })
         .catch(err => { log.error(err) })
     })

packages/libp2p/src/libp2p.ts

@@ -96,8 +96,7 @@ export class Libp2pNode<T extends ServiceMap = Record<string, unknown>> extends
       if (evt.detail.previous == null) {
         const peerInfo: PeerInfo = {
           id: evt.detail.peer.id,
-          multiaddrs: evt.detail.peer.addresses.map(a => a.multiaddr),
-          protocols: evt.detail.peer.protocols
+          multiaddrs: evt.detail.peer.addresses.map(a => a.multiaddr)
         }
 
         components.events.safeDispatchEvent('peer:discovery', { detail: peerInfo })
@@ -380,8 +379,7 @@ export class Libp2pNode<T extends ServiceMap = Record<string, unknown>> extends
     }
 
     void this.components.peerStore.merge(peer.id, {
-      multiaddrs: peer.multiaddrs,
-      protocols: peer.protocols
+      multiaddrs: peer.multiaddrs
     })
       .catch(err => { this.#log.error(err) })
   }

packages/libp2p/test/circuit-relay/utils.ts

@@ -159,8 +159,7 @@ export class MockContentRouting implements ContentRouting {
 
     providers.push({
       id: this.peerId,
-      multiaddrs: this.addressManager.getAddresses(),
-      protocols: []
+      multiaddrs: this.addressManager.getAddresses()
     })
 
     MockContentRouting.providers.set(cid.toString(), providers)

packages/libp2p/test/content-routing/content-routing.node.ts

@@ -251,8 +251,7 @@ describe('content-routing', () => {
         id: providerPeerId,
         multiaddrs: [
           multiaddr('/ip4/123.123.123.123/tcp/49320')
-        ],
-        protocols: []
+        ]
       }
 
       if (node.services.dht == null) {

packages/peer-discovery-bootstrap/src/index.ts

@@ -134,8 +134,7 @@ class Bootstrap extends TypedEventEmitter<PeerDiscoveryEvents> implements PeerDi
 
       const peerData: PeerInfo = {
         id: peerIdFromString(peerIdStr),
-        multiaddrs: [ma],
-        protocols: []
+        multiaddrs: [ma]
       }
 
       this.list.push(peerData)

packages/peer-discovery-mdns/src/query.ts

@@ -74,8 +74,7 @@ export function gotResponse (rsp: ResponsePacket, localPeerName: string, service
 
     return {
       id: peerIdFromString(peerId),
-      multiaddrs: multiaddrs.map(addr => addr.decapsulateCode(protocols('p2p').code)),
-      protocols: []
+      multiaddrs: multiaddrs.map(addr => addr.decapsulateCode(protocols('p2p').code))
     }
   } catch (e) {
     log.error('failed to parse mdns response', e)