fix: discovery mechanism examples not working (#1365)

Co-authored-by: achingbrain <alex@achingbrain.net>- fixed tests that were passing even though the example isn't working
- added timeouts to avoid infinite wait

Fixes #1229

Author: mpetrunic

examples/discovery-mechanisms/3.js

@@ -67,7 +67,7 @@ const createNode = async (bootstrappers) => {
     const peer = evt.detail
     console.log(`Peer ${node1.peerId.toString()} discovered: ${peer.id.toString()}`)
   })
-  node2.addEventListener('peer:discovery',(evt) => {
+  node2.addEventListener('peer:discovery', (evt) => {
     const peer = evt.detail
     console.log(`Peer ${node2.peerId.toString()} discovered: ${peer.id.toString()}`)
   })
@@ -77,4 +77,4 @@ const createNode = async (bootstrappers) => {
     node1.start(),
     node2.start()
   ])
-})();
+})()

examples/discovery-mechanisms/test-2.js

@@ -27,7 +27,7 @@ export async function test () {
     })
   })
 
-  await pWaitFor(() => discoveredNodes > 1)
+  await pWaitFor(() => discoveredNodes > 1, 600000)
 
   proc.kill()
 }

examples/discovery-mechanisms/test-3.js

@@ -7,7 +7,7 @@ import { fileURLToPath } from 'url'
 const __dirname = path.dirname(fileURLToPath(import.meta.url))
 
 export async function test () {
-  let discoveredNodes = 0
+  const discoveredPeers = []
 
   process.stdout.write('3.js\n')
 
@@ -19,15 +19,20 @@ export async function test () {
   proc.all.on('data', async (data) => {
     process.stdout.write(data)
     const str = uint8ArrayToString(data)
-
+    const discoveredPeersRegex = /Peer\s+(?<Peer1>[^\s]+)\s+discovered:\s+(?<Peer2>[^\s]+)/
     str.split('\n').forEach(line => {
-      if (line.includes('discovered:')) {
-        discoveredNodes++
+      const peers = line.match(discoveredPeersRegex)
+      if (peers != null) {
+        // sort so we don't count reversed pair twice
+        const match = [peers.groups.Peer1, peers.groups.Peer2].sort().join(',')
+        if (!discoveredPeers.includes(match)) {
+          discoveredPeers.push(match)
+        }
       }
     })
   })
 
-  await pWaitFor(() => discoveredNodes > 3)
+  await pWaitFor(() => discoveredPeers.length > 2, 600000)
 
   proc.kill()
 }

examples/package.json

@@ -9,7 +9,7 @@
   },
   "license": "MIT",
   "dependencies": {
-    "@libp2p/pubsub-peer-discovery": "^6.0.1",
+    "@libp2p/pubsub-peer-discovery": "^6.0.2",
     "@libp2p/floodsub": "^3.0.3",
     "@nodeutils/defaults-deep": "^1.1.0",
     "execa": "^6.1.0",