core: remove builtin tx2 module (replace with prom-client plugin)

packages/hydrooj/package.json

@@ -47,8 +47,7 @@
         "semver": "^7.3.7",
         "serialize-javascript": "^6.0.0",
         "superagent": "^8.0.0",
-        "thirty-two": "^1.0.2",
-        "tx2": "^1.0.5"
+        "thirty-two": "^1.0.2"
     },
     "devDependencies": {
         "@types/adm-zip": "^0.4.34",

packages/hydrooj/src/service/monitor.ts

@@ -1,10 +1,8 @@
 import crypto from 'crypto';
 import { dump } from 'js-yaml';
 import superagent from 'superagent';
-import tx2 from 'tx2';
 import type { StatusUpdate } from '@hydrooj/utils/lib/sysinfo';
 import * as sysinfo from '@hydrooj/utils/lib/sysinfo';
-import { Time } from '@hydrooj/utils/lib/utils';
 import { Logger } from '../logger';
 import * as bus from './bus';
 import db from './db';
@@ -108,20 +106,6 @@ if (process.env.NODE_APP_INSTANCE === '0') {
             feedback();
             setInterval(update, 1800 * 1000);
         });
-        const taskColl = db.collection('task');
-        let taskCount = await taskColl.find().count();
-        const recordColl = db.collection('record');
-        let recordCount = await recordColl.find({
-            _id: { $gte: Time.getObjectID(new Date(Date.now() - 60 * 1000)) },
-        }).count();
-        tx2.metric('task', () => taskCount);
-        tx2.metric('submission', () => recordCount);
-        setInterval(() => {
-            taskColl.find().count().then((c) => { taskCount = c; });
-            recordColl.find({
-                _id: { $gte: Time.getObjectID(new Date(Date.now() - 60 * 1000)) },
-            }).count().then((c) => { recordCount = c; });
-        }, 1000);
     });
 }
 

packages/hydrooj/src/service/router.ts

@@ -2,12 +2,10 @@ import { IncomingMessage } from 'http';
 import KoaRouter from 'koa-router';
 import parseUrl from 'parseurl';
 import { pathToRegexp } from 'path-to-regexp';
-import tx2 from 'tx2';
 import type WebSocket from 'ws';
 import type { KoaContext } from './server';
 
 type WebSocketCallback = (socket: WebSocket, request: IncomingMessage, ctx: KoaContext) => void;
-const connCount = tx2.counter({ name: 'connections' });
 
 export class WebSocketLayer {
     clients = new Set<WebSocket>();
@@ -20,9 +18,7 @@ export class WebSocketLayer {
     accept(socket: WebSocket, request: IncomingMessage, ctx: KoaContext) {
         if (!this.regexp.test(parseUrl(request).pathname)) return false;
         this.clients.add(socket);
-        connCount.inc();
         socket.on('close', () => {
-            connCount.dec();
             this.clients.delete(socket);
         });
         this.callback?.(socket, request, ctx);

packages/hydrooj/src/service/server.ts

@@ -6,7 +6,6 @@ import Compress from 'koa-compress';
 import proxy from 'koa-proxies';
 import cache from 'koa-static-cache';
 import { filter } from 'lodash';
-import tx2 from 'tx2';
 import WebSocket from 'ws';
 import { parseMemoryMB } from '@hydrooj/utils/lib/utils';
 import {
@@ -81,11 +80,6 @@ export interface KoaContext extends Koa.Context {
 
 const argv = cac().parse();
 const logger = new Logger('server');
-const reqCount = tx2.meter({
-    name: 'req/sec',
-    samples: 1,
-    timeframe: 60,
-});
 export const app = new Koa<Koa.DefaultState, KoaContext>({
     keys: system.get('server.keys'),
 });
@@ -270,7 +264,6 @@ async function bail(name: string, ...args: any[]) {
 }
 
 async function handle(ctx: KoaContext, HandlerClass, checker) {
-    reqCount.mark();
     const {
         args, request, response, user, domain, UiContext,
     } = ctx.HydroContext;