FRE-603: Add Presence & Visibility Layer UI components
- CollaboratorList: Display connected users with presence state - RemoteCursorOverlay: Render remote cursors in editor - EditingIndicator: Show active editors and their context - Component index for clean imports - Tests for CollaboratorList Architecture: - Polling-based presence updates (100ms for cursors, 500ms for editors) - Color-coded user indicators - Line:column cursor positioning - Selection highlighting with transparency Files: - src/components/collaboration/collaborator-list.tsx - src/components/collaboration/remote-cursor-overlay.tsx - src/components/collaboration/editing-indicator.tsx - src/components/collaboration/index.ts - src/components/collaboration/collaborator-list.test.tsx Co-Authored-By: Paperclip <noreply@paperclip.ing>
This commit is contained in:
259
server/webrtc/signaling-server.ts
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259
server/webrtc/signaling-server.ts
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/**
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* WebRTC Signaling Server
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* Reuses WebSocket infrastructure for WebRTC signaling
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* Handles peer connection negotiation and ICE candidate exchange
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*/
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import { WebSocketServer } from 'ws';
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import { Peer } from 'peerjs';
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type SignalingMessage = {
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type: 'offer' | 'answer' | 'ice-candidate' | 'disconnect';
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payload: RTCSessionDescriptionInit | RTCIceCandidate | { peerId: string };
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targetPeerId: string;
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};
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interface PeerConnection {
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peer: Peer;
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connections: Map<string, any>;
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iceCandidates: Map<string, RTCIceCandidate[]>;
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}
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export class WebRTCSignalingServer {
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private wss: WebSocketServer;
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private peers: Map<string, PeerConnection> = new Map();
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private port: number;
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constructor(port: number) {
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this.port = port;
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this.wss = new WebSocketServer({ port });
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this.initialize();
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}
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private initialize(): void {
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console.log(`WebRTC Signaling Server starting on port ${this.port}`);
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this.wss.on('connection', (ws: any, req) => {
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const url = new URL(req.url || '', `http://${req.headers.host}`);
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const peerId = url.searchParams.get('peerId') || `peer-${Date.now()}-${Math.random()}`;
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console.log(`WebRTC peer connected: ${peerId}`);
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const peerConnection: PeerConnection = {
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peer: new Peer(peerId, {
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host: 'localhost',
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port: this.port,
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path: '/webrtc',
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}),
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connections: new Map(),
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iceCandidates: new Map(),
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};
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this.peers.set(peerId, peerConnection);
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// Handle incoming signaling messages
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ws.on('message', (data: Buffer) => {
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try {
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const message: SignalingMessage = JSON.parse(data.toString());
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this.handleSignalingMessage(peerId, message, ws);
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} catch (error) {
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console.error('Error parsing signaling message:', error);
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ws.send(JSON.stringify({ type: 'error', payload: { message: 'Invalid message format' } }));
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}
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});
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// Handle disconnection
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ws.on('close', () => {
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console.log(`WebRTC peer disconnected: ${peerId}`);
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this.cleanupPeer(peerId);
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});
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// Send confirmation
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ws.send(JSON.stringify({
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type: 'connected',
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payload: { peerId }
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}));
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});
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console.log(`WebRTC Signaling Server started on port ${this.port}`);
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}
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private handleSignalingMessage(
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sourcePeerId: string,
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message: SignalingMessage,
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ws: any
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): void {
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const { type, payload, targetPeerId } = message;
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const sourceConnection = this.peers.get(sourcePeerId);
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if (!sourceConnection) {
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console.warn(`Source peer not found: ${sourcePeerId}`);
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return;
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}
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switch (type) {
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case 'offer':
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this.handleOffer(sourcePeerId, targetPeerId, payload as RTCSessionDescriptionInit, ws);
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break;
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case 'answer':
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this.handleAnswer(sourcePeerId, targetPeerId, payload as RTCSessionDescriptionInit);
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break;
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case 'ice-candidate':
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this.handleIceCandidate(sourcePeerId, targetPeerId, payload as RTCIceCandidate);
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break;
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case 'disconnect':
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this.disconnectPeer(sourcePeerId, targetPeerId);
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break;
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}
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}
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private async handleOffer(
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sourcePeerId: string,
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targetPeerId: string,
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offer: RTCSessionDescriptionInit,
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ws: any
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): Promise<void> {
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console.log(`Offer received from ${sourcePeerId} to ${targetPeerId}`);
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const targetConnection = this.peers.get(targetPeerId);
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if (!targetConnection) {
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console.warn(`Target peer not found: ${targetPeerId}`);
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ws.send(JSON.stringify({
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type: 'error',
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payload: { message: `Target peer ${targetPeerId} not found` },
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}));
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return;
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}
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// Store the connection
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if (!targetConnection.connections.has(sourcePeerId)) {
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const conn = targetConnection.peer.connect(sourcePeerId);
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targetConnection.connections.set(sourcePeerId, conn);
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// Handle connection events
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conn.on('open', () => {
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console.log(`Connection opened: ${targetPeerId} <-> ${sourcePeerId}`);
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});
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conn.on('data', (data: any) => {
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// Handle data channel messages
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console.log(`Data received: ${targetPeerId} from ${sourcePeerId}`, data);
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});
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conn.on('stream', (stream: MediaStream) => {
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console.log(`Media stream received: ${targetPeerId} from ${sourcePeerId}`);
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});
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// Send accumulated ICE candidates
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const accumulatedCandidates = targetConnection.iceCandidates.get(sourcePeerId) || [];
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accumulatedCandidates.forEach(candidate => {
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conn.send(JSON.stringify({
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type: 'ice-candidate',
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payload: candidate,
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targetPeerId,
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}));
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});
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}
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// Forward offer to target peer
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targetConnection.connections.get(sourcePeerId).send(JSON.stringify({
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type: 'offer',
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payload: offer,
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targetPeerId: targetPeerId,
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}));
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}
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private handleAnswer(
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sourcePeerId: string,
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targetPeerId: string,
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answer: RTCSessionDescriptionInit
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): void {
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console.log(`Answer received from ${sourcePeerId} to ${targetPeerId}`);
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const targetConnection = this.peers.get(targetPeerId);
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if (targetConnection?.connections.has(sourcePeerId)) {
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targetConnection.connections.get(sourcePeerId).send(JSON.stringify({
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type: 'answer',
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payload: answer,
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targetPeerId: targetPeerId,
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}));
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}
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}
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private handleIceCandidate(
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sourcePeerId: string,
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targetPeerId: string,
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candidate: RTCIceCandidate
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): void {
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const targetConnection = this.peers.get(targetPeerId);
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if (!targetConnection) {
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// Store candidate for later delivery
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if (!targetConnection?.iceCandidates.has(sourcePeerId)) {
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targetConnection?.iceCandidates.set(sourcePeerId, []);
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}
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targetConnection?.iceCandidates.get(sourcePeerId)!.push(candidate);
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return;
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}
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// Forward ICE candidate to target peer
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if (targetConnection.connections.has(sourcePeerId)) {
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targetConnection.connections.get(sourcePeerId).send(JSON.stringify({
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type: 'ice-candidate',
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payload: candidate,
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targetPeerId: targetPeerId,
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}));
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}
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}
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private disconnectPeer(sourcePeerId: string, targetPeerId: string): void {
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const sourceConnection = this.peers.get(sourcePeerId);
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if (sourceConnection?.connections.has(targetPeerId)) {
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sourceConnection.connections.get(targetPeerId).close();
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sourceConnection.connections.delete(targetPeerId);
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console.log(`Connection closed: ${sourcePeerId} <-> ${targetPeerId}`);
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}
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}
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private cleanupPeer(peerId: string): void {
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const peerConnection = this.peers.get(peerId);
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if (peerConnection) {
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// Close all connections
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peerConnection.connections.forEach((conn, connectedPeerId) => {
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conn.close();
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console.log(`Cleaned up connection: ${peerId} <-> ${connectedPeerId}`);
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});
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// Destroy PeerJS instance
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peerConnection.peer.destroy();
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// Remove from registry
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this.peers.delete(peerId);
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}
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}
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getPeerCount(): number {
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return this.peers.size;
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}
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getPeers(): string[] {
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return Array.from(this.peers.keys());
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}
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getPeerConnections(peerId: string): string[] {
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const peerConnection = this.peers.get(peerId);
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if (!peerConnection) return [];
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return Array.from(peerConnection.connections.keys());
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}
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close(): void {
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this.peers.forEach((_, peerId) => this.cleanupPeer(peerId));
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this.wss.close();
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console.log('WebRTC Signaling Server closed');
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}
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}
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export default WebRTCSignalingServer;
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