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chore: update chat-with-mdns example readme #2678

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Dec 31, 2023
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chore: update chat-with-mdns example readme #2678

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d877b21
chore: update readme for example chat-with-mdns
Halimao Dec 29, 2023
ce041aa
update old example code
Halimao Dec 29, 2023
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16 changes: 12 additions & 4 deletions examples/chat-with-mdns/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -57,29 +57,37 @@ func handleStream(stream net.Stream) {

3. **Find peers nearby using mdns**

Start [mdns discovery](https://godoc.org/github.com/libp2p/go-libp2p/p2p/discovery#NewMdnsService) service in host.
New [mdns discovery](https://godoc.org/github.com/libp2p/go-libp2p/p2p/discovery#NewMdnsService) service in host.

```go
ser, err := discovery.NewMdnsService(peerhost, rendezvous)
notifee := &discoveryNotifee{PeerChan: make(chan peer.AddrInfo)}
ser, err := discovery.NewMdnsService(peerhost, rendezvous, notifee)
```
register [Notifee interface](https://godoc.org/github.com/libp2p/go-libp2p/p2p/discovery#Notifee) with service so that we get notified about peer discovery

```go
n := &discoveryNotifee{}
ser.RegisterNotifee(n)
ser.Start()
```



4. **Open streams to peers found.**

Finally we open stream to the peers we found, as we find them

```go
peer := <-peerChan // will block until we discover a peer
// this is used to avoid call `NewStream` from both side
if peer.ID > host.ID() {
// if other end peer id greater than us, don't connect to it, just wait for it to connect us
fmt.Println("Found peer:", peer, " id is greater than us, wait for it to connect to us")
continue
}
fmt.Println("Found peer:", peer, ", connecting")

if err := host.Connect(ctx, peer); err != nil {
fmt.Println("Connection failed:", err)
continue
}

// open a stream, this stream will be handled by handleStream other end
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