fix: upgrader should not need muxers (#517)

* fix: upgrader should not need muxers

* chore: address review

* chore: apply suggestions from code review

Co-Authored-By: Jacob Heun <jacobheun@gmail.com>

Author: vasco-santos

src/upgrader.js

@@ -64,7 +64,7 @@ class Upgrader {
   async upgradeInbound (maConn) {
     let encryptedConn
     let remotePeer
-    let muxedConnection
+    let upgradedConn
     let Muxer
     let cryptoProtocol
     let setPeer
@@ -94,7 +94,11 @@ class Upgrader {
       } = await this._encryptInbound(this.localPeer, protectedConn, this.cryptos))
 
       // Multiplex the connection
-      ;({ stream: muxedConnection, Muxer } = await this._multiplexInbound(encryptedConn, this.muxers))
+      if (this.muxers.size) {
+        ({ stream: upgradedConn, Muxer } = await this._multiplexInbound(encryptedConn, this.muxers))
+      } else {
+        upgradedConn = encryptedConn
+      }
     } catch (err) {
       log.error('Failed to upgrade inbound connection', err)
       await maConn.close(err)
@@ -112,7 +116,7 @@ class Upgrader {
       cryptoProtocol,
       direction: 'inbound',
       maConn,
-      muxedConnection,
+      upgradedConn,
       Muxer,
       remotePeer
     })
@@ -134,7 +138,7 @@ class Upgrader {
 
     let encryptedConn
     let remotePeer
-    let muxedConnection
+    let upgradedConn
     let cryptoProtocol
     let Muxer
     let setPeer
@@ -164,7 +168,11 @@ class Upgrader {
       } = await this._encryptOutbound(this.localPeer, protectedConn, remotePeerId, this.cryptos))
 
       // Multiplex the connection
-      ;({ stream: muxedConnection, Muxer } = await this._multiplexOutbound(encryptedConn, this.muxers))
+      if (this.muxers.size) {
+        ({ stream: upgradedConn, Muxer } = await this._multiplexOutbound(encryptedConn, this.muxers))
+      } else {
+        upgradedConn = encryptedConn
+      }
     } catch (err) {
       log.error('Failed to upgrade outbound connection', err)
       await maConn.close(err)
@@ -182,7 +190,7 @@ class Upgrader {
       cryptoProtocol,
       direction: 'outbound',
       maConn,
-      muxedConnection,
+      upgradedConn,
       Muxer,
       remotePeer
     })
@@ -195,7 +203,7 @@ class Upgrader {
    * @param {string} cryptoProtocol The crypto protocol that was negotiated
    * @param {string} direction One of ['inbound', 'outbound']
    * @param {MultiaddrConnection} maConn The transport layer connection
-   * @param {*} muxedConnection A duplex connection returned from multiplexer selection
+   * @param {*} upgradedConn A duplex connection returned from multiplexer and/or crypto selection
    * @param {Muxer} Muxer The muxer to be used for muxing
    * @param {PeerId} remotePeer The peer the connection is with
    * @returns {Connection}
@@ -204,49 +212,52 @@ class Upgrader {
     cryptoProtocol,
     direction,
     maConn,
-    muxedConnection,
+    upgradedConn,
     Muxer,
     remotePeer
   }) {
-    // Create the muxer
-    const muxer = new Muxer({
-      // Run anytime a remote stream is created
-      onStream: async muxedStream => {
-        const mss = new Multistream.Listener(muxedStream)
+    let muxer, newStream
+
+    if (Muxer) {
+      // Create the muxer
+      muxer = new Muxer({
+        // Run anytime a remote stream is created
+        onStream: async muxedStream => {
+          const mss = new Multistream.Listener(muxedStream)
+          try {
+            const { stream, protocol } = await mss.handle(Array.from(this.protocols.keys()))
+            log('%s: incoming stream opened on %s', direction, protocol)
+            if (this.metrics) this.metrics.trackStream({ stream, remotePeer, protocol })
+            connection.addStream(stream, protocol)
+            this._onStream({ connection, stream, protocol })
+          } catch (err) {
+            log.error(err)
+          }
+        },
+        // Run anytime a stream closes
+        onStreamEnd: muxedStream => {
+          connection.removeStream(muxedStream.id)
+        }
+      })
+
+      newStream = async protocols => {
+        log('%s: starting new stream on %s', direction, protocols)
+        const muxedStream = muxer.newStream()
+        const mss = new Multistream.Dialer(muxedStream)
         try {
-          const { stream, protocol } = await mss.handle(Array.from(this.protocols.keys()))
-          log('%s: incoming stream opened on %s', direction, protocol)
+          const { stream, protocol } = await mss.select(protocols)
           if (this.metrics) this.metrics.trackStream({ stream, remotePeer, protocol })
-          connection.addStream(stream, protocol)
-          this._onStream({ connection, stream, protocol })
+          return { stream: { ...muxedStream, ...stream }, protocol }
         } catch (err) {
-          log.error(err)
+          log.error('could not create new stream', err)
+          throw errCode(err, codes.ERR_UNSUPPORTED_PROTOCOL)
         }
-      },
-      // Run anytime a stream closes
-      onStreamEnd: muxedStream => {
-        connection.removeStream(muxedStream.id)
       }
-    })
 
-    const newStream = async protocols => {
-      log('%s: starting new stream on %s', direction, protocols)
-      const muxedStream = muxer.newStream()
-      const mss = new Multistream.Dialer(muxedStream)
-      try {
-        const { stream, protocol } = await mss.select(protocols)
-        if (this.metrics) this.metrics.trackStream({ stream, remotePeer, protocol })
-        return { stream: { ...muxedStream, ...stream }, protocol }
-      } catch (err) {
-        log.error('could not create new stream', err)
-        throw errCode(err, codes.ERR_UNSUPPORTED_PROTOCOL)
-      }
+      // Pipe all data through the muxer
+      pipe(upgradedConn, muxer, upgradedConn)
     }
 
-    // Pipe all data through the muxer
-    pipe(muxedConnection, muxer, muxedConnection)
-
-    maConn.timeline.upgraded = Date.now()
     const _timeline = maConn.timeline
     maConn.timeline = new Proxy(_timeline, {
       set: (...args) => {
@@ -258,6 +269,11 @@ class Upgrader {
         return Reflect.set(...args)
       }
     })
+    maConn.timeline.upgraded = Date.now()
+
+    const errConnectionNotMultiplexed = () => {
+      throw errCode(new Error('connection is not multiplexed'), 'ERR_CONNECTION_NOT_MULTIPLEXED')
+    }
 
     // Create the connection
     const connection = new Connection({
@@ -268,11 +284,11 @@ class Upgrader {
       stat: {
         direction,
         timeline: maConn.timeline,
-        multiplexer: Muxer.multicodec,
+        multiplexer: Muxer && Muxer.multicodec,
         encryption: cryptoProtocol
       },
-      newStream,
-      getStreams: () => muxer.streams,
+      newStream: newStream || errConnectionNotMultiplexed,
+      getStreams: () => muxer ? muxer.streams : errConnectionNotMultiplexed,
       close: err => maConn.close(err)
     })
 

test/upgrading/upgrader.spec.js

@@ -116,6 +116,35 @@ describe('Upgrader', () => {
     expect(result).to.eql([hello])
   })
 
+  it('should upgrade with only crypto', async () => {
+    const { inbound, outbound } = mockMultiaddrConnPair({ addrs, remotePeer })
+
+    // No available muxers
+    const muxers = new Map()
+    sinon.stub(localUpgrader, 'muxers').value(muxers)
+    sinon.stub(remoteUpgrader, 'muxers').value(muxers)
+
+    const cryptos = new Map([[Crypto.protocol, Crypto]])
+    sinon.stub(localUpgrader, 'cryptos').value(cryptos)
+    sinon.stub(remoteUpgrader, 'cryptos').value(cryptos)
+
+    const connections = await Promise.all([
+      localUpgrader.upgradeOutbound(outbound),
+      remoteUpgrader.upgradeInbound(inbound)
+    ])
+
+    expect(connections).to.have.length(2)
+
+    await expect(connections[0].newStream('/echo/1.0.0')).to.be.rejected()
+
+    // Verify the MultiaddrConnection close method is called
+    sinon.spy(inbound, 'close')
+    sinon.spy(outbound, 'close')
+    await Promise.all(connections.map(conn => conn.close()))
+    expect(inbound.close.callCount).to.equal(1)
+    expect(outbound.close.callCount).to.equal(1)
+  })
+
   it('should use a private connection protector when provided', async () => {
     const { inbound, outbound } = mockMultiaddrConnPair({ addrs, remotePeer })