feat: add playlist update and delete functionality

backend/socket/PlaylistSocketHandler.js

@@ -0,0 +1,47 @@
+const PlaylistService = require('../services/PlaylistService');
+const ChannelService = require('../services/ChannelService');
+const Channel = require('../models/Channel');
+
+module.exports = (io, socket) => {
+
+    socket.on('add-playlist', async ({ playlist, restream, headersJson }) => {
+        try {
+            const channels = await PlaylistService.addPlaylist(playlist, restream, headersJson);
+            if (channels) {
+                channels.forEach(channel => {
+                    io.emit('channel-added', channel);
+                });
+            }
+        } catch (err) {
+            console.error(err);
+            socket.emit('app-error', { message: err.message });
+        }
+    });
+
+
+    socket.on('update-playlist', ({ playlist, updatedAttributes }) => {
+        try {
+            const channels =  PlaylistService.updatePlaylist(playlist, updatedAttributes);
+            channels.forEach(channel => {
+                io.emit('channel-updated', channel);
+            });
+        } catch (err) {
+            console.error(err);
+            socket.emit('app-error', { message: err.message });
+        }
+    });
+
+
+    socket.on('delete-playlist', (playlist) => {
+        try {
+            const channels = PlaylistService.deletePlaylist(playlist);
+            channels.forEach(channel => {
+                io.emit('channel-deleted', channel.id);
+            });
+            io.emit('channel-selected', ChannelService.getCurrentChannel());
+        } catch (err) {
+            console.error(err);
+            socket.emit('app-error', { message: err.message });
+        }
+    });
+};