diff --git a/packages/html2md/lib.ts b/packages/html2md/lib.ts
index 0cda67505..a4cf55161 100644
--- a/packages/html2md/lib.ts
+++ b/packages/html2md/lib.ts
@@ -1,6 +1,12 @@
 import 'hydrooj';
 import TurndownService from 'turndown';
 
+declare module 'hydrooj' {
+    interface Lib {
+        convertHTML: (str: string) => string,
+    }
+}
+
 const turndownService = new TurndownService({
     headingStyle: 'atx',
     codeBlockStyle: 'fenced',
diff --git a/packages/hydrooj/src/entry/master.ts b/packages/hydrooj/src/entry/master.ts
index ae5c61cae..0c4252632 100644
--- a/packages/hydrooj/src/entry/master.ts
+++ b/packages/hydrooj/src/entry/master.ts
@@ -7,8 +7,10 @@ import pslist from 'ps-list';
 import { argv } from 'yargs';
 import { builtinModel } from './common';
 import { Entry } from '../loader';
+import { Logger } from '../logger';
 import * as bus from '../service/bus';
 
+const logger = new Logger('entry/master');
 const tmpdir = path.resolve(os.tmpdir(), 'hydro');
 const lockfile = path.resolve(tmpdir, 'lock.json');
 
@@ -19,7 +21,7 @@ export async function load(call: Entry) {
             const file = require(lockfile);
             const plist = await pslist();
             if (file.pid && plist.map((i) => i.pid).includes(file.pid)) {
-                console.error(`Lockfile exists, pid=${file.pid}`);
+                logger.error(`Lockfile exists, pid=${file.pid}`);
                 process.exit(1);
             }
         } catch {
@@ -37,9 +39,9 @@ export async function load(call: Entry) {
     require('../error');
     const config = require('../options')();
     if (!config) {
-        console.log('Starting setup');
+        logger.info('Starting setup');
         await call({ entry: 'setup', newProcess: true }).catch((err) => {
-            console.error('Cannot start setup process.', err);
+            logger.error('Cannot start setup process.', err);
             process.exit(1);
         });
     }
diff --git a/packages/hydrooj/src/handler/homework.ts b/packages/hydrooj/src/handler/homework.ts
index 2d282f2b7..13646d687 100644
--- a/packages/hydrooj/src/handler/homework.ts
+++ b/packages/hydrooj/src/handler/homework.ts
@@ -199,7 +199,6 @@ class HomeworkDetailProblemSubmitHandler extends HomeworkDetailProblemHandler {
 class HomeworkCreateHandler extends HomeworkHandler {
     async get() {
         const beginAt = moment().add(1, 'day');
-        console.log(beginAt, beginAt.tz(this.user.timeZone));
         const penaltySince = beginAt.clone().add(7, 'days');
         const path = [
             ['Hydro', 'homepage'],
@@ -343,7 +342,6 @@ class HomeworkEditHandler extends HomeworkHandler {
 class HomeworkScoreboardHandler extends HomeworkHandler {
     @param('tid', Types.ObjectID)
     async get(domainId: string, tid: ObjectID) {
-        console.log(123);
         const [tdoc, rows, udict] = await this.getScoreboard(
             domainId, tid, false, document.TYPE_HOMEWORK,
         );
diff --git a/packages/hydrooj/src/interface.ts b/packages/hydrooj/src/interface.ts
index 8942513d1..f5542bc28 100644
--- a/packages/hydrooj/src/interface.ts
+++ b/packages/hydrooj/src/interface.ts
@@ -410,6 +410,13 @@ export interface JudgeResultBody {
     stderr?: string,
 }
 
+export interface Task {
+    _id: ObjectID,
+    type: string,
+    executeAfter?: Date
+    [key: string]: any
+}
+
 export type PathComponent = [string, string, Dictionary<any>?, boolean?];
 
 export interface Collections {
@@ -428,7 +435,7 @@ export interface Collections {
     'status': any,
     'oauth': any,
     'system': System,
-    'task': any,
+    'task': Task,
     'opcount': any,
     'fs.chunks': any,
     'fs.files': any,
@@ -454,7 +461,7 @@ export interface Model {
     token: typeof import('./model/token'),
     training: typeof import('./model/training'),
     user: typeof import('./model/user'),
-    [key: string]: any,
+    oauth: typeof import('./model/oauth'),
 }
 
 export interface Service {
@@ -463,7 +470,11 @@ export interface Service {
     gridfs: GridFSBucket,
     monitor: typeof import('./service/monitor'),
     server: typeof import('./service/server'),
-    [key: string]: any,
+}
+
+interface GeoIP {
+    provider: string,
+    lookup: (ip: string, locale?: string) => any,
 }
 
 export interface Lib {
@@ -484,7 +495,8 @@ export interface Lib {
     'testdata.convert.ini': typeof import('./lib/testdata.convert.ini'),
     useragent: typeof import('./lib/useragent'),
     validator: typeof import('./lib/validator'),
-    [key: string]: any
+    template?: any,
+    geoip?: GeoIP,
 }
 
 export interface UI {
diff --git a/packages/login-with-github/lib.ts b/packages/login-with-github/lib.ts
index 26290cfaf..2c65fe066 100644
--- a/packages/login-with-github/lib.ts
+++ b/packages/login-with-github/lib.ts
@@ -10,6 +10,9 @@ declare module 'hydrooj' {
         'login-with-github.secret': string,
         'login-with-github.proxy': string,
     }
+    interface Lib {
+        oauth_github: typeof import('./lib'),
+    }
 }
 
 async function get() {
diff --git a/packages/login-with-google/lib.ts b/packages/login-with-google/lib.ts
index 797724d87..7bf01c349 100644
--- a/packages/login-with-google/lib.ts
+++ b/packages/login-with-google/lib.ts
@@ -10,6 +10,9 @@ declare module 'hydrooj' {
         'login-with-google.secret': string,
         'login-with-google.proxy': string,
     }
+    interface Lib {
+        oauth_google: typeof import('./lib'),
+    }
 }
 
 async function get() {
diff --git a/packages/login-with-osu/lib.ts b/packages/login-with-osu/lib.ts
index 3da90d76d..bc07210d3 100644
--- a/packages/login-with-osu/lib.ts
+++ b/packages/login-with-osu/lib.ts
@@ -10,6 +10,9 @@ declare module 'hydrooj' {
         'login-with-osu.secret': string,
         'login-with-osu.proxy': string,
     }
+    interface Lib {
+        oauth_osu: typeof import('./lib'),
+    }
 }
 
 const BASE_URL = 'https://osu.ppy.sh/';
diff --git a/packages/login-with-qq/lib.ts b/packages/login-with-qq/lib.ts
index 40f64e3be..1f5e9fb79 100644
--- a/packages/login-with-qq/lib.ts
+++ b/packages/login-with-qq/lib.ts
@@ -1,6 +1,12 @@
 import 'hydrooj';
 import 'hydrooj/dist/utils';
 
+declare module 'hydrooj' {
+    interface Lib {
+        oauth_qq: typeof import('./lib'),
+    }
+}
+
 async function get() {
     const { system, token } = global.Hydro.model;
     const secret = String.random(8);