fix!: remove autodialer (#2639)

The autodialer is a feature from an older time when the DHT was less reliable and we didn't have things like the random walk component.

There's not a lot of benefit in opening connections to any old peer, instead protocols now have better ways of targetting the kind of peers they require.

Actively dialing peers harms platforms where connections are extremely expensive such as react-native so this feature has been removed.

Closes #2621
Fixes #2418

BREAKING CHANGE: the autodialer has been removed as well as the corresponding config keys

---------

Co-authored-by: Russell Dempsey <1173416+SgtPooki@users.noreply.github.com>

Author: achingbrain

doc/CONFIGURATION.md

@@ -626,8 +626,7 @@ const node = await createLibp2p({
     noise()
   ],
   connectionManager: {
-    maxConnections: Infinity,
-    minConnections: 0
+    maxConnections: Infinity
   }
 })
 ```

doc/LIMITS.md

@@ -38,12 +38,6 @@ const node = await createLibp2p({
      */
     maxConnections: 100,
 
-    /**
-     * If the number of open connections goes below this number, the node
-     * will try to connect to randomly selected peers from the peer store
-     */
-    minConnections: 50,
-
     /**
      * How many connections can be open but not yet upgraded
      */

interop/test/fixtures/get-libp2p.ts

@@ -25,9 +25,6 @@ const IP = process.env.ip ?? '0.0.0.0'
 export async function getLibp2p (): Promise<Libp2p<{ ping: PingService }>> {
   const options: Libp2pOptions<{ ping: PingService, identify: Identify }> = {
     start: true,
-    connectionManager: {
-      minConnections: 0
-    },
     connectionGater: {
       denyDialMultiaddr: async () => false
     },

packages/integration-tests/.aegir.js

@@ -24,8 +24,7 @@ export default {
       const peerId = await createEd25519PeerId()
       const libp2p = await createLibp2p({
         connectionManager: {
-          inboundConnectionThreshold: Infinity,
-          minConnections: 0
+          inboundConnectionThreshold: Infinity
         },
         addresses: {
           listen: [

packages/integration-tests/test/bootstrap.spec.ts

@@ -2,8 +2,11 @@
 
 import { bootstrap } from '@libp2p/bootstrap'
 import { TypedEventEmitter, peerDiscoverySymbol } from '@libp2p/interface'
+import { mplex } from '@libp2p/mplex'
 import { createEd25519PeerId } from '@libp2p/peer-id-factory'
+import { plaintext } from '@libp2p/plaintext'
 import { webSockets } from '@libp2p/websockets'
+import * as Filter from '@libp2p/websockets/filters'
 import { multiaddr } from '@multiformats/multiaddr'
 import { expect } from 'aegir/chai'
 import { createLibp2p } from 'libp2p'
@@ -103,4 +106,52 @@ describe('bootstrap', () => {
 
     return deferred.promise
   })
+
+  it('bootstrap should dial all peers in the list', async () => {
+    const deferred = defer()
+
+    const bootstrappers = [
+      `${process.env.RELAY_MULTIADDR}`
+    ]
+
+    libp2p = await createLibp2p({
+      connectionEncryption: [
+        plaintext()
+      ],
+      transports: [
+        webSockets({
+          filter: Filter.all
+        })
+      ],
+      streamMuxers: [
+        mplex()
+      ],
+      peerDiscovery: [
+        bootstrap({
+          list: bootstrappers
+        })
+      ],
+      connectionGater: {
+        denyDialMultiaddr: () => false
+      }
+    })
+
+    const expectedPeers = new Set(
+      bootstrappers.map(ma => multiaddr(ma).getPeerId())
+    )
+
+    libp2p.addEventListener('connection:open', (evt) => {
+      const { remotePeer } = evt.detail
+
+      expectedPeers.delete(remotePeer.toString())
+      if (expectedPeers.size === 0) {
+        libp2p.removeEventListener('connection:open')
+        deferred.resolve()
+      }
+    })
+
+    await libp2p.start()
+
+    return deferred.promise
+  })
 })

packages/integration-tests/test/circuit-relay.node.ts

@@ -42,9 +42,6 @@ async function createClient (options: Libp2pOptions = {}): Promise<Libp2p> {
     connectionEncryption: [
       plaintext()
     ],
-    connectionManager: {
-      minConnections: 0
-    },
     services: {
       identify: identify()
     },

packages/integration-tests/test/fetch.spec.ts

@@ -11,9 +11,6 @@ async function createNode (): Promise<Libp2p<{ fetch: Fetch }>> {
   return createLibp2p(createBaseOptions({
     services: {
       fetch: fetch()
-    },
-    connectionManager: {
-      minConnections: 0
     }
   }))
 }

packages/integration-tests/test/interop.ts

@@ -135,10 +135,7 @@ async function createJsPeer (options: SpawnOptions): Promise<Daemon> {
     },
     transports: [tcp(), circuitRelayTransport()],
     streamMuxers: [],
-    connectionEncryption: [noise()],
-    connectionManager: {
-      minConnections: 0
-    }
+    connectionEncryption: [noise()]
   }
 
   if (options.noListen !== true) {

packages/integration-tests/test/peers.spec.ts

@@ -0,0 +1,59 @@
+/* eslint-env mocha */
+
+import { KEEP_ALIVE, type Libp2p } from '@libp2p/interface'
+import { expect } from 'aegir/chai'
+import { createLibp2p } from 'libp2p'
+import pWaitFor from 'p-wait-for'
+import { createBaseOptions } from './fixtures/base-options.js'
+
+describe('peers', () => {
+  let nodes: Libp2p[]
+
+  beforeEach(async () => {
+    nodes = await Promise.all([
+      createLibp2p(createBaseOptions()),
+      createLibp2p(createBaseOptions()),
+      createLibp2p(createBaseOptions())
+    ])
+  })
+
+  afterEach(async () => Promise.all(nodes.map(async n => { await n.stop() })))
+
+  it('should redial a peer tagged with KEEP_ALIVE', async () => {
+    await nodes[0].dial(nodes[1].getMultiaddrs())
+
+    expect(nodes[0].getConnections(nodes[1].peerId)).to.not.be.empty()
+
+    await nodes[0].peerStore.merge(nodes[1].peerId, {
+      tags: {
+        [KEEP_ALIVE]: {
+          value: 1
+        }
+      }
+    })
+
+    await Promise.all(
+      nodes[0].getConnections(nodes[1].peerId).map(async conn => conn.close())
+    )
+
+    await pWaitFor(async () => {
+      return nodes[0].getConnections(nodes[1].peerId).length > 0
+    }, {
+      interval: 100,
+      timeout: {
+        milliseconds: 5000,
+        message: 'Did not reconnect to peer tagged with KEEP_ALIVE'
+      }
+    })
+  })
+
+  it('should store the multiaddr for a peer after a successful dial', async () => {
+    await nodes[0].dial(nodes[1].getMultiaddrs())
+
+    expect(nodes[0].getConnections(nodes[1].peerId)).to.not.be.empty()
+
+    const peer = await nodes[0].peerStore.get(nodes[1].peerId)
+    expect(peer.addresses).to.not.be.empty()
+    expect(peer.metadata.get('last-dial-success')).to.be.ok()
+  })
+})

packages/libp2p/.aegir.js

@@ -20,8 +20,7 @@ export default {
       const peerId = await createEd25519PeerId()
       const libp2p = await createLibp2p({
         connectionManager: {
-          inboundConnectionThreshold: Infinity,
-          minConnections: 0
+          inboundConnectionThreshold: Infinity
         },
         addresses: {
           listen: [

packages/libp2p/package.json

@@ -107,6 +107,7 @@
     "merge-options": "^3.0.4",
     "multiformats": "^13.1.0",
     "p-defer": "^4.0.1",
+    "p-retry": "^6.2.0",
     "progress-events": "^1.0.0",
     "race-event": "^1.3.0",
     "race-signal": "^1.0.2",