Refactor list of notification channels into its own file

lib/www/server/lib/db/channels.js

@@ -0,0 +1,13 @@
+
+// This is the list of all channels for which the
+// database issues notifications.
+// NOTE: This needs to be kept up to date with
+// database schema changes.
+
+module.exports = [
+	"realtime", "event", "project",
+	"preplot_lines", "preplot_points",
+	"planned_lines",
+	"raw_lines", "raw_shots",
+	"final_lines", "final_shots", "info"
+];

lib/www/server/ws/index.js

@@ -1,17 +1,10 @@
 const ws = require('ws');
 const URL = require('url');
 const db = require('./db');
+const channels = require('../lib/db/channels');
 
 function start (server, pingInterval=30000) {
 	
-	const channels = [
-		"realtime", "event", "project",
-		"preplot_lines", "preplot_points",
-		"planned_lines",
-		"raw_lines", "raw_shots",
-		"final_lines", "final_shots", "info"
-	];
-
 	const wsServer = new ws.Server({ noServer: true });
 	wsServer.on('connection', socket => {
 		socket.alive = true;