refactor: pubsub (#467)

* feat: peer-store v0

* chore: apply suggestions from code review

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

* chore: address review

* refactor: pubsub subsystem

* chore: address review

* chore: use topology interface

* chore: address review

* chore: address review

* chore: simplify tests

test/pubsub/implementations.node.js

@@ -0,0 +1,95 @@
+'use strict'
+/* eslint-env mocha */
+
+const chai = require('chai')
+chai.use(require('dirty-chai'))
+const { expect } = chai
+
+const pWaitFor = require('p-wait-for')
+const pDefer = require('p-defer')
+const mergeOptions = require('merge-options')
+
+const Floodsub = require('libp2p-floodsub')
+const Gossipsub = require('libp2p-gossipsub')
+const { multicodec: floodsubMulticodec } = require('libp2p-floodsub')
+const { multicodec: gossipsubMulticodec } = require('libp2p-gossipsub')
+
+const multiaddr = require('multiaddr')
+
+const { create } = require('../../src')
+const { baseOptions } = require('./utils')
+const peerUtils = require('../utils/creators/peer')
+
+const listenAddr = multiaddr('/ip4/127.0.0.1/tcp/0')
+const remoteListenAddr = multiaddr('/ip4/127.0.0.1/tcp/0')
+
+describe('Pubsub subsystem is able to use different implementations', () => {
+  let peerInfo, remotePeerInfo
+  let libp2p, remoteLibp2p
+  let remAddr
+
+  beforeEach(async () => {
+    [peerInfo, remotePeerInfo] = await peerUtils.createPeerInfoFromFixture(2)
+
+    peerInfo.multiaddrs.add(listenAddr)
+    remotePeerInfo.multiaddrs.add(remoteListenAddr)
+  })
+
+  afterEach(() => Promise.all([
+    libp2p && libp2p.stop(),
+    remoteLibp2p && remoteLibp2p.stop()
+  ]))
+
+  it('Floodsub nodes', () => {
+    return pubsubTest(floodsubMulticodec, Floodsub)
+  })
+
+  it('Gossipsub nodes', () => {
+    return pubsubTest(gossipsubMulticodec, Gossipsub)
+  })
+
+  const pubsubTest = async (multicodec, pubsub) => {
+    const defer = pDefer()
+    const topic = 'test-topic'
+    const data = 'hey!'
+
+    libp2p = await create(mergeOptions(baseOptions, {
+      peerInfo,
+      modules: {
+        pubsub: pubsub
+      }
+    }))
+
+    remoteLibp2p = await create(mergeOptions(baseOptions, {
+      peerInfo: remotePeerInfo,
+      modules: {
+        pubsub: pubsub
+      }
+    }))
+
+    await Promise.all([
+      libp2p.start(),
+      remoteLibp2p.start()
+    ])
+
+    const libp2pId = libp2p.peerInfo.id.toB58String()
+    remAddr = remoteLibp2p.transportManager.getAddrs()[0]
+
+    const connection = await libp2p.dialProtocol(remAddr, multicodec)
+    expect(connection).to.exist()
+
+    libp2p.pubsub.subscribe(topic, (msg) => {
+      expect(msg.data.toString()).to.equal(data)
+      defer.resolve()
+    })
+
+    // wait for remoteLibp2p to know about libp2p subscription
+    await pWaitFor(() => {
+      const subscribedPeers = remoteLibp2p.pubsub.getPeersSubscribed(topic)
+      return subscribedPeers.includes(libp2pId)
+    })
+
+    remoteLibp2p.pubsub.publish(topic, data)
+    await defer.promise
+  }
+})