core: update to mongodb5 (#514)

packages/hydrooj/src/entry/cli.ts

@@ -3,7 +3,7 @@
 import path from 'path';
 import cac from 'cac';
 import fs from 'fs-extra';
-import { ObjectID } from 'mongodb';
+import { ObjectId } from 'mongodb';
 import { Context } from '../context';
 import db from '../service/db';
 import {
@@ -67,8 +67,8 @@ async function cli() {
     for (let i = 0; i < args.length; i++) {
         if ("'\"".includes(args[i][0]) && "'\"".includes(args[i][args[i].length - 1])) {
             args[i] = args[i].substr(1, args[i].length - 2);
-        } else if (args[i].length === 24 && ObjectID.isValid(args[i])) {
-            args[i] = new ObjectID(args[i]);
+        } else if (args[i].length === 24 && ObjectId.isValid(args[i])) {
+            args[i] = new ObjectId(args[i]);
         } else if ((+args[i]).toString() === args[i]) {
             args[i] = +args[i];
         } else if (args[i].startsWith('~')) {

packages/hydrooj/src/entry/setup.ts

@@ -5,7 +5,7 @@ import cac from 'cac';
 import fs from 'fs-extra';
 import Koa, { Context } from 'koa';
 import Body from 'koa-body';
-import mongodb from 'mongodb';
+import { MongoClient, WriteConcern } from 'mongodb';
 import { Logger } from '../logger';
 
 const logger = new Logger('setup');
@@ -85,11 +85,12 @@ async function post(ctx: Context) {
     if (username) mongourl += `${username}:${password}@`;
     mongourl += `${host}:${port}/${name}`;
     try {
-        const Database = await mongodb.MongoClient.connect(mongourl, {
-            useNewUrlParser: true, useUnifiedTopology: true,
+        const Database = await MongoClient.connect(mongourl, {
+            readPreference: 'nearest',
+            writeConcern: new WriteConcern('majority'),
         });
         const db = Database.db(name);
-        const coll = db.collection('system');
+        const coll = db.collection<any>('system');
         await Promise.all([
             coll.updateOne(
                 { _id: 'server.url' },