feat: ipns over dht

Author: vasco-santos

package.json

@@ -127,10 +127,10 @@
     "joi": "^13.4.0",
     "joi-browser": "^13.4.0",
     "joi-multiaddr": "^3.0.0",
-    "libp2p": "~0.24.0",
+    "libp2p": "~0.24.1",
     "libp2p-bootstrap": "~0.9.3",
     "libp2p-crypto": "~0.14.1",
-    "libp2p-kad-dht": "~0.11.1",
+    "libp2p-kad-dht": "~0.12.1",
     "libp2p-keychain": "~0.3.3",
     "libp2p-mdns": "~0.12.0",
     "libp2p-mplex": "~0.8.4",

src/core/components/libp2p.js

@@ -3,6 +3,7 @@
 const promisify = require('promisify-es6')
 const get = require('lodash/get')
 const defaultsDeep = require('@nodeutils/defaults-deep')
+const ipnsUtils = require('../ipns/routing/utils')
 
 module.exports = function libp2p (self) {
   return {
@@ -16,6 +17,7 @@ module.exports = function libp2p (self) {
 
         const defaultBundle = (opts) => {
           const libp2pDefaults = {
+            datastore: opts.datastore,
             peerInfo: opts.peerInfo,
             peerBook: opts.peerBook,
             config: {
@@ -43,6 +45,14 @@ module.exports = function libp2p (self) {
                     get(opts.config, 'relay.hop.active', false))
                 }
               },
+              dht: {
+                validators: {
+                  ipns: ipnsUtils.validator
+                },
+                selectors: {
+                  ipns: ipnsUtils.selector
+                }
+              },
               EXPERIMENTAL: {
                 dht: get(opts.options, 'EXPERIMENTAL.dht', false),
                 pubsub: get(opts.options, 'EXPERIMENTAL.pubsub', false)
@@ -72,6 +82,7 @@ module.exports = function libp2p (self) {
         self._libp2pNode = libp2pBundle({
           options: self._options,
           config: config,
+          datastore: self._repo.datastore,
           peerInfo: self._peerInfo,
           peerBook: self._peerInfoBook
         })

src/core/components/start.js

@@ -54,10 +54,14 @@ module.exports = (self) => {
           ipnsStores.push(pubsubDs)
         }
 
-        // NOTE: IPNS routing is being replaced by the local repo datastore while the IPNS over DHT is not ready
-        // When DHT is added, if local option enabled, should receive offlineDatastore as well
-        const offlineDatastore = new OfflineDatastore(self._repo)
-        ipnsStores.push(offlineDatastore)
+        // DHT should be added as routing if we are not running with local flag
+        // TODO: Need to change this logic once DHT is enabled by default, for now fallback to Offline datastore
+        if (get(self._options, 'EXPERIMENTAL.dht', false) && !self._options.local) {
+          ipnsStores.push(self._libp2pNode.dht)
+        } else {
+          const offlineDatastore = new OfflineDatastore(self._repo)
+          ipnsStores.push(offlineDatastore)
+        }
 
         // Create ipns routing with a set of datastores
         const routing = new TieredDatastore(ipnsStores)

src/core/ipns/publisher.js

@@ -56,7 +56,6 @@ class IpnsPublisher {
       log.error(errMsg)
       return callback(errcode(new Error(errMsg), 'ERR_INVALID_PEER_ID'))
     }
-
     const publicKey = peerId._pubKey
 
     ipns.embedPublicKey(publicKey, record, (err, embedPublicKeyRecord) => {
@@ -162,45 +161,55 @@ class IpnsPublisher {
     const checkRouting = !(options.checkRouting === false)
 
     this._repo.datastore.get(ipns.getLocalKey(peerId.id), (err, dsVal) => {
-      let result
-
       if (err) {
         if (err.code !== 'ERR_NOT_FOUND') {
           const errMsg = `unexpected error getting the ipns record ${peerId.id} from datastore`
 
           log.error(errMsg)
           return callback(errcode(new Error(errMsg), 'ERR_UNEXPECTED_DATASTORE_RESPONSE'))
-        } else {
-          if (!checkRouting) {
+        }
+
+        if (!checkRouting) {
+          return callback(null, null)
+        }
+
+        // Try to get from routing
+        let keys
+        try {
+          keys = ipns.getIdKeys(peerId.toBytes())
+        } catch (err) {
+          log.error(err)
+          return callback(err)
+        }
+
+        this._routing.get(keys.routingKey, (err, res) => {
+          if (err) {
+            log(`error when determining the last published IPNS record for ${peerId.id}`)
             return callback(null, null)
-          } else {
-            // TODO ROUTING - get from DHT
-            return callback(new Error('not implemented yet'))
           }
-        }
-      }
 
-      if (Buffer.isBuffer(dsVal)) {
-        result = dsVal
+          // unmarshal data
+          this._unmarshalData(res, callback)
+        })
       } else {
-        const errMsg = `found ipns record that we couldn't convert to a value`
-
-        log.error(errMsg)
-        return callback(errcode(new Error(errMsg), 'ERR_INVALID_IPNS_RECORD'))
+        // unmarshal data
+        this._unmarshalData(dsVal, callback)
       }
+    })
+  }
 
-      // unmarshal data
-      try {
-        result = ipns.unmarshal(dsVal)
-      } catch (err) {
-        const errMsg = `found ipns record that we couldn't convert to a value`
+  _unmarshalData (data, callback) {
+    let result
+    try {
+      result = ipns.unmarshal(data)
+    } catch (err) {
+      const errMsg = `found ipns record that we couldn't convert to a value`
 
-        log.error(errMsg)
-        return callback(null, null)
-      }
+      log.error(errMsg)
+      return callback(null, null)
+    }
 
-      callback(null, result)
-    })
+    callback(null, result)
   }
 
   _updateOrCreateRecord (privKey, value, validity, peerId, callback) {
@@ -212,7 +221,7 @@ class IpnsPublisher {
     }
 
     const getPublishedOptions = {
-      checkRouting: false // TODO ROUTING - change to true
+      checkRouting: true
     }
 
     this._getPublished(peerId, getPublishedOptions, (err, record) => {

src/core/ipns/resolver.js

@@ -1,8 +1,10 @@
 'use strict'
 
 const ipns = require('ipns')
+const crypto = require('libp2p-crypto')
 const PeerId = require('peer-id')
 const errcode = require('err-code')
+const parallel = require('async/parallel')
 
 const debug = require('debug')
 const log = debug('jsipfs:ipns:resolver')
@@ -96,13 +98,14 @@ class IpnsResolver {
       return callback(err)
     }
 
-    const { routingKey } = ipns.getIdKeys(peerId.toBytes())
+    const { routingKey, routingPubKey } = ipns.getIdKeys(peerId.toBytes())
 
-    // TODO DHT - get public key from routing?
-    // https://github.com/ipfs/go-ipfs/blob/master/namesys/routing.go#L70
-    // https://github.com/libp2p/go-libp2p-routing/blob/master/routing.go#L99
-
-    this._routing.get(routingKey.toBuffer(), (err, res) => {
+    parallel([
+      // Name should be the hash of a public key retrievable from ipfs.
+      // We retrieve public key to add it to the PeerId, as the IPNS record may not have it.
+      (cb) => this._routing.get(routingPubKey.toBuffer(), cb),
+      (cb) => this._routing.get(routingKey.toBuffer(), cb)
+    ], (err, res) => {
       if (err) {
         if (err.code !== 'ERR_NOT_FOUND') {
           const errMsg = `unexpected error getting the ipns record ${peerId.id}`
@@ -116,9 +119,21 @@ class IpnsResolver {
         return callback(errcode(new Error(errMsg), 'ERR_NO_RECORD_FOUND'))
       }
 
+      // Public key
+      try {
+        // Insert it into the peer id public key, to be validated by IPNS validator
+        peerId.pubKey = crypto.keys.unmarshalPublicKey(res[0])
+      } catch (err) {
+        const errMsg = `found public key record that we couldn't convert to a value`
+
+        log.error(errMsg)
+        return callback(errcode(new Error(errMsg), 'ERR_INVALID_PUB_KEY_RECEIVED'))
+      }
+
+      // IPNS entry
       let ipnsEntry
       try {
-        ipnsEntry = ipns.unmarshal(res)
+        ipnsEntry = ipns.unmarshal(res[1])
       } catch (err) {
         const errMsg = `found ipns record that we couldn't convert to a value`
 

src/core/ipns/routing/utils.js

@@ -1,9 +1,16 @@
 'use strict'
 
 const multibase = require('multibase')
+const ipns = require('ipns')
 
-module.exports.encodeBase32 = (buf) => {
-  const m = multibase.encode('base32', buf).slice(1) // slice off multibase codec
+module.exports = {
+  encodeBase32: (buf) => {
+    const m = multibase.encode('base32', buf).slice(1) // slice off multibase codec
 
-  return m.toString().toUpperCase() // should be uppercase for interop with go
+    return m.toString().toUpperCase() // should be uppercase for interop with go
+  },
+  validator: {
+    func: (key, record, cb) => ipns.validator.validate(record, key, cb)
+  },
+  selector: (k, records) => ipns.validator.select(records[0], records[1])
 }