core: fix database connection

packages/hydrooj/src/service/db.ts

@@ -21,7 +21,7 @@ class MongoService {
     private opts: MongoConfig;
 
     static buildUrl(opts: MongoConfig) {
-        let mongourl = `${opts.protocol}://`;
+        let mongourl = `${opts.protocol || 'mongodb'}://`;
         if (opts.username) mongourl += `${opts.username}:${opts.password}@`;
         mongourl += `${opts.host}:${opts.port}/${opts.name}`;
         if (opts.url) mongourl = opts.url;

packages/hydrooj/src/service/server.ts

@@ -289,8 +289,8 @@ export class HandlerCommon {
             ...this.user,
             gravatar: misc.gravatar(this.user.gravatar || '', 128),
             perm: this.user.perm.toString(),
+            viewLang: this.translate('__id'),
         };
-        UserContext.viewLang = this.translate('__id');
         if (!global.Hydro.lib.template) return JSON.stringify(context);
         const res = await global.Hydro.lib.template.render(name, {
             handler: this,