Use webrtc-direct protocol with peer signalling integrated into relay node (#307)

* Use webrtc-direct transport with pubsub based discovery

* Use changes to integrate signalling using relay node

* Add an indicator for peer connection type (direct/relayed)

* Catch errors while creting a libp2p node

* Catch errors while dialling peers

* Catch errors when dialling from relay node

* Pass CLI arg for port to listen on for relay node

* Subscribe chat CLI to pubsub topic

* Update yarn lockfile

* Update webrtc-direct dependency in package json

* Update webrtc-direct version

* Update yarn lockfile

packages/cli/README.md

@@ -17,13 +17,6 @@ A basic CLI to pass messages between peers using `stdin`/`stdout`
   yarn build
   ```
 
-* (Optional) Run a local signalling server:
-
-  ```bash
-  # In packages/peer
-  yarn signal-server
-  ```
-
 * (Optional) Create and export a peer id for the relay node:
 
   ```bash
@@ -37,10 +30,10 @@ A basic CLI to pass messages between peers using `stdin`/`stdout`
 
   ```bash
   # In packages/peer
-  yarn relay-node --signal-server [SIGNAL_SERVER_URL] --peer-id-file [PEER_ID_FILE_PATH] --relay-peers [RELAY_PEERS_FILE_PATH]
+  yarn relay-node --port [LISTEN_PORT] --peer-id-file [PEER_ID_FILE_PATH] --relay-peers [RELAY_PEERS_FILE_PATH]
   ```
 
-  * `signal-server`: multiaddr of a signalling server (default: local signalling server multiaddr)
+  * `port`: Port to start listening on (default: `9090`)
   * `peer-id-file`: file path for peer id to be used (json)
   * `relay-peers`: file path for relay peer multiaddr(s) to dial on startup (json)
 
@@ -48,10 +41,9 @@ A basic CLI to pass messages between peers using `stdin`/`stdout`
 
   ```bash
   # In packages/cli
-  yarn chat --signal-server [SIGNAL_SERVER_URL] --relay-node [RELAY_NODE_URL]
+  yarn chat --relay-node <RELAY_NODE_URL>
   ```
 
-  * `signal-server`: multiaddr of a signalling server (default: local signalling server multiaddr)
   * `relay-node`: multiaddr of a primary hop enabled relay node
 
 * The process starts reading from `stdin` and outputs messages from others peers to `stdout`.

packages/cli/src/chat.ts

@@ -9,26 +9,27 @@ import yargs from 'yargs';
 // @ts-expect-error https://github.com/microsoft/TypeScript/issues/49721#issuecomment-1319854183
 import { PeerId } from '@libp2p/interface-peer-id';
 
+const TEST_TOPIC = 'test';
 interface Arguments {
-  signalServer: string;
   relayNode: string;
 }
 
 async function main (): Promise<void> {
   const argv: Arguments = _getArgv();
-  if (!argv.signalServer) {
-    console.log('Using the default signalling server URL');
-  }
 
   // https://adamcoster.com/blog/commonjs-and-esm-importexport-compatibility-examples#importing-esm-into-commonjs-cjs
   const { Peer } = await import('@cerc-io/peer');
-  const peer = new Peer(true);
-  await peer.init(argv.signalServer, argv.relayNode);
+  const peer = new Peer(argv.relayNode, true);
+  await peer.init();
 
   peer.subscribeMessage((peerId: PeerId, message: string) => {
     console.log(`> ${peerId.toString()} > ${message}`);
   });
 
+  peer.subscribeTopic(TEST_TOPIC, (peerId, data) => {
+    console.log(`> ${peerId.toString()} > ${data}`);
+  });
+
   console.log(`Peer ID: ${peer.peerId?.toString()}`);
 
   const rl = readline.createInterface({
@@ -47,13 +48,10 @@ function _getArgv (): any {
   return yargs(hideBin(process.argv)).parserConfiguration({
     'parse-numbers': false
   }).options({
-    signalServer: {
-      type: 'string',
-      describe: 'Signalling server URL'
-    },
     relayNode: {
       type: 'string',
-      describe: 'Relay node URL'
+      describe: 'Relay node URL',
+      demandOption: true
     }
   }).argv;
 }