refactor: dht async/await (#480)

* refactor: core async (#478)

* refactor: cleanup core

test: auto dial on startup

* fix: make hangup work properly

* chore: fix lint

* chore: apply suggestions from code review

Co-Authored-By: Vasco Santos <vasco.santos@moxy.studio>

* fix: provide libp2p dialer to the dht

* chore: use dht release

src/dht.js

@@ -1,43 +1,72 @@
 'use strict'
 
-const nextTick = require('async/nextTick')
 const errCode = require('err-code')
-const promisify = require('promisify-es6')
 
 const { messages, codes } = require('./errors')
 
-module.exports = (node) => {
+module.exports = (node, DHT, config) => {
+  const dht = new DHT({
+    dialer: node.dialer,
+    peerInfo: node.peerInfo,
+    peerStore: node.peerStore,
+    registrar: node.registrar,
+    datastore: this.datastore,
+    ...config
+  })
+
   return {
-    put: promisify((key, value, callback) => {
-      if (!node._dht) {
-        return nextTick(callback, errCode(new Error(messages.DHT_DISABLED), codes.DHT_DISABLED))
+    /**
+     * Store the given key/value pair in the DHT.
+     * @param {Buffer} key
+     * @param {Buffer} value
+     * @param {Object} [options] - put options
+     * @param {number} [options.minPeers] - minimum number of peers required to successfully put
+     * @returns {Promise<void>}
+     */
+    put: (key, value, options) => {
+      if (!node.isStarted() || !dht.isStarted) {
+        throw errCode(new Error(messages.NOT_STARTED_YET), codes.DHT_NOT_STARTED)
       }
 
-      node._dht.put(key, value, callback)
-    }),
-    get: promisify((key, options, callback) => {
-      if (typeof options === 'function') {
-        callback = options
-        options = {}
+      return dht.put(key, value, options)
+    },
+
+    /**
+     * Get the value to the given key.
+     * Times out after 1 minute by default.
+     * @param {Buffer} key
+     * @param {Object} [options] - get options
+     * @param {number} [options.timeout] - optional timeout (default: 60000)
+     * @returns {Promise<{from: PeerId, val: Buffer}>}
+     */
+    get: (key, options) => {
+      if (!node.isStarted() || !dht.isStarted) {
+        throw errCode(new Error(messages.NOT_STARTED_YET), codes.DHT_NOT_STARTED)
       }
 
-      if (!node._dht) {
-        return nextTick(callback, errCode(new Error(messages.DHT_DISABLED), codes.DHT_DISABLED))
+      return dht.get(key, options)
+    },
+
+    /**
+     * Get the `n` values to the given key without sorting.
+     * @param {Buffer} key
+     * @param {number} nVals
+     * @param {Object} [options] - get options
+     * @param {number} [options.timeout] - optional timeout (default: 60000)
+     * @returns {Promise<Array<{from: PeerId, val: Buffer}>>}
+     */
+    getMany: (key, nVals, options) => {
+      if (!node.isStarted() || !dht.isStarted) {
+        throw errCode(new Error(messages.NOT_STARTED_YET), codes.DHT_NOT_STARTED)
       }
 
-      node._dht.get(key, options, callback)
-    }),
-    getMany: promisify((key, nVals, options, callback) => {
-      if (typeof options === 'function') {
-        callback = options
-        options = {}
-      }
+      return dht.getMany(key, nVals, options)
+    },
 
-      if (!node._dht) {
-        return nextTick(callback, errCode(new Error(messages.DHT_DISABLED), codes.DHT_DISABLED))
-      }
+    _dht: dht,
 
-      node._dht.getMany(key, nVals, options, callback)
-    })
+    start: () => dht.start(),
+
+    stop: () => dht.stop()
   }
 }

src/dialer.js

@@ -8,6 +8,7 @@ const AbortController = require('abort-controller')
 const debug = require('debug')
 const log = debug('libp2p:dialer')
 log.error = debug('libp2p:dialer:error')
+const PeerId = require('peer-id')
 
 const { codes } = require('./errors')
 const {
@@ -20,15 +21,18 @@ class Dialer {
    * @constructor
    * @param {object} options
    * @param {TransportManager} options.transportManager
+   * @param {Peerstore} peerStore
    * @param {number} options.concurrency Number of max concurrent dials. Defaults to `MAX_PARALLEL_DIALS`
    * @param {number} options.timeout How long a dial attempt is allowed to take. Defaults to `DIAL_TIMEOUT`
    */
   constructor ({
     transportManager,
+    peerStore,
     concurrency = MAX_PARALLEL_DIALS,
     timeout = DIAL_TIMEOUT
   }) {
     this.transportManager = transportManager
+    this.peerStore = peerStore
     this.concurrency = concurrency
     this.timeout = timeout
     this.queue = new PQueue({ concurrency, timeout, throwOnTimeout: true })
@@ -97,18 +101,22 @@ class Dialer {
   }
 
   /**
-   * Connects to a given `PeerInfo` by dialing all of its known addresses.
+   * Connects to a given `PeerInfo` or `PeerId` by dialing all of its known addresses.
    * The dial to the first address that is successfully able to upgrade a connection
    * will be used.
    *
    * @async
-   * @param {PeerInfo} peerInfo The remote peer to dial
+   * @param {PeerInfo|PeerId} peer The remote peer to dial
    * @param {object} [options]
    * @param {AbortSignal} [options.signal] An AbortController signal
    * @returns {Promise<Connection>}
    */
-  async connectToPeer (peerInfo, options = {}) {
-    const addrs = peerInfo.multiaddrs.toArray()
+  async connectToPeer (peer, options = {}) {
+    if (PeerId.isPeerId(peer)) {
+      peer = this.peerStore.get(peer.toB58String())
+    }
+
+    const addrs = peer.multiaddrs.toArray()
     for (const addr of addrs) {
       try {
         return await this.connectToMultiaddr(addr, options)

src/errors.js

@@ -8,6 +8,7 @@ exports.messages = {
 exports.codes = {
   DHT_DISABLED: 'ERR_DHT_DISABLED',
   PUBSUB_NOT_STARTED: 'ERR_PUBSUB_NOT_STARTED',
+  DHT_NOT_STARTED: 'ERR_DHT_NOT_STARTED',
   ERR_CONNECTION_ENDED: 'ERR_CONNECTION_ENDED',
   ERR_CONNECTION_FAILED: 'ERR_CONNECTION_FAILED',
   ERR_NODE_NOT_STARTED: 'ERR_NODE_NOT_STARTED',

src/index.js

@@ -91,7 +91,8 @@ class Libp2p extends EventEmitter {
     }
 
     this.dialer = new Dialer({
-      transportManager: this.transportManager
+      transportManager: this.transportManager,
+      peerStore: this.peerStore
     })
 
     // Attach stream multiplexers
@@ -118,13 +119,8 @@ class Libp2p extends EventEmitter {
     }
 
     // dht provided components (peerRouting, contentRouting, dht)
-    if (this._config.dht.enabled) {
-      const DHT = this._modules.dht
-
-      this._dht = new DHT(this._switch, {
-        datastore: this.datastore,
-        ...this._config.dht
-      })
+    if (this._modules.dht) {
+      this._dht = dht(this, this._modules.dht, this._config.dht)
     }
 
     // start pubsub
@@ -136,7 +132,6 @@ class Libp2p extends EventEmitter {
     // peer and content routing will automatically get modules from _modules and _dht
     this.peerRouting = peerRouting(this)
     this.contentRouting = contentRouting(this)
-    this.dht = dht(this)
 
     this._peerDiscovered = this._peerDiscovered.bind(this)
   }
@@ -186,6 +181,7 @@ class Libp2p extends EventEmitter {
 
     try {
       this.pubsub && await this.pubsub.stop()
+      this._dht && await this._dht.stop()
       await this.transportManager.close()
     } catch (err) {
       if (err) {
@@ -312,6 +308,10 @@ class Libp2p extends EventEmitter {
     if (this._config.pubsub.enabled) {
       this.pubsub && this.pubsub.start()
     }
+
+    if (this._config.dht.enabled) {
+      this._dht && this._dht.start()
+    }
   }
 
   /**

src/peer-store/index.js

@@ -37,24 +37,28 @@ class PeerStore extends EventEmitter {
    * Stores the peerInfo of a new peer.
    * If already exist, its info is updated.
    * @param {PeerInfo} peerInfo
+   * @return {PeerInfo}
    */
   put (peerInfo) {
     assert(PeerInfo.isPeerInfo(peerInfo), 'peerInfo must be an instance of peer-info')
 
+    let peer
     // Already know the peer?
     if (this.peers.has(peerInfo.id.toB58String())) {
-      this.update(peerInfo)
+      peer = this.update(peerInfo)
     } else {
-      this.add(peerInfo)
+      peer = this.add(peerInfo)
 
       // Emit the new peer found
       this.emit('peer', peerInfo)
     }
+    return peer
   }
 
   /**
    * Add a new peer to the store.
    * @param {PeerInfo} peerInfo
+   * @return {PeerInfo}
    */
   add (peerInfo) {
     assert(PeerInfo.isPeerInfo(peerInfo), 'peerInfo must be an instance of peer-info')
@@ -86,11 +90,13 @@ class PeerStore extends EventEmitter {
     })
 
     this.peers.set(peerInfo.id.toB58String(), peerProxy)
+    return peerProxy
   }
 
   /**
    * Updates an already known peer.
    * @param {PeerInfo} peerInfo
+   * @return {PeerInfo}
    */
   update (peerInfo) {
     assert(PeerInfo.isPeerInfo(peerInfo), 'peerInfo must be an instance of peer-info')
@@ -148,6 +154,8 @@ class PeerStore extends EventEmitter {
     if (!recorded.id.pubKey && peerInfo.id.pubKey) {
       recorded.id.pubKey = peerInfo.id.pubKey
     }
+
+    return recorded
   }
 
   /**
@@ -165,6 +173,15 @@ class PeerStore extends EventEmitter {
     return undefined
   }
 
+  /**
+   * Has the info to the given id.
+   * @param {string} peerId b58str id
+   * @returns {boolean}
+   */
+  has (peerId) {
+    return this.peers.has(peerId)
+  }
+
   /**
    * Removes the Peer with the matching `peerId` from the PeerStore
    * @param {string} peerId b58str id