only consider VFS servers from the same region

plugins/c9.preview/preview.js

@@ -6,6 +6,7 @@ define(function(require, exports, module) {
         "db",
         "c9.login",
         "preview.handler",
+        "vfs.serverlist",
         "user-content.redirect",
         "connect.remote-address"
     ];
@@ -13,21 +14,18 @@ define(function(require, exports, module) {
     return main;
 
     function main(options, imports, register) {
-        var maxVfsAge = options.maxVfsAge || 20 * 1000;
-        var region = options.region;
-        
         var session = imports.session;
         var db = imports.db;
         var ensureLoggedIn = imports["c9.login"].ensureLoggedIn();
         var handler = imports["preview.handler"];
         var userContent = imports["user-content.redirect"];
+        var getVfsServers = imports["vfs.serverlist"].getServers;
         
         var frontdoor = require("frontdoor");
         var error = require("http-error");
         var requestTimeout = require("c9/request_timeout");
         
         var api = frontdoor();
-        var vfsServers;
         
         api.registerType("username", /^[0-9a-z_\-]*$/i);
         api.registerType("projectname", /^[0-9a-z\-_]*$/i);
@@ -55,7 +53,7 @@ define(function(require, exports, module) {
             handler.getProjectSession(),
             handler.getRole(db),
             handler.getProxyUrl(function() {
-                return vfsServers ? vfsServers[0] : null;
+                return getVfsServers()[0] || null;
             }),
             handler.proxyCall()
         ]); 
@@ -81,53 +79,7 @@ define(function(require, exports, module) {
         }, function(req, res, next) {
             res.redirect(req.url + "/");
         }); 
-        
-        function updateVfsServerList(callback) {
-            db.Vfs.findAllAndPurge(maxVfsAge, function(err, servers) {
-                if (err) 
-                    return callback(err);
-                if (!servers.length) 
-                    return callback(new Error("No VFS server available"));
-                
-                vfsServers = shuffleServers(servers);
-                callback();
-            });
-        }
-        
-        function shuffleServers(servers) {
-            servers = servers.slice();
-            var isBeta = region == "beta";
-            servers = servers.filter(function(s) {
-                return isBeta ? s.region == "beta" : s.region !== "beta";
-            });
-            return servers.sort(function(a, b) {
-                if (a.region == b.region) {
-                    if (a.load < b.load)
-                        return -1;
-                    else
-                        return 1;
-                }
-                else if (a.region == region)
-                    return -1;
-                else if (b.region == region)
-                    return 1;
-                else
-                    return 0;
-            });
-        }
-        
-        load();
-        function load() {
-            updateVfsServerList(function(err) {
-                if (err)
-                    return setTimeout(load, 20000);
-        
-                setInterval(updateVfsServerList.bind(null, function(err) {
-                    if (err) console.error("Retrieving VFS server list failed", err);
-                }), 20 * 1000);
-                
-                register();
-            });
-        }
+
+        register();
     }
 });