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import { Injectable } from '@nestjs/common';
import si from 'systeminformation';
import Xev from 'xev';
import * as osUtils from 'os-utils';
import { bindThis } from '@/decorators.js';
import type { OnApplicationShutdown } from '@nestjs/common';
const ev = new Xev();
const interval = 2000;
const roundCpu = (num: number) => Math.round(num * 1000) / 1000;
const round = (num: number) => Math.round(num * 10) / 10;
@Injectable()
export class ServerStatsService implements OnApplicationShutdown {
private intervalId: NodeJS.Timer;
constructor(
) {
}
/**
* Report server stats regularly
*/
@bindThis
public start(): void {
const log = [] as any[];
ev.on('requestServerStatsLog', x => {
ev.emit(`serverStatsLog:${x.id}`, log.slice(0, x.length ?? 50));
});
const tick = async () => {
const cpu = await cpuUsage();
const memStats = await mem();
const netStats = await net();
const fsStats = await fs();
const stats = {
cpu: roundCpu(cpu),
mem: {
used: round(memStats.used - memStats.buffers - memStats.cached),
active: round(memStats.active),
},
net: {
rx: round(Math.max(0, netStats.rx_sec)),
tx: round(Math.max(0, netStats.tx_sec)),
},
fs: {
r: round(Math.max(0, fsStats.rIO_sec ?? 0)),
w: round(Math.max(0, fsStats.wIO_sec ?? 0)),
},
};
ev.emit('serverStats', stats);
log.unshift(stats);
if (log.length > 200) log.pop();
};
tick();
this.intervalId = setInterval(tick, interval);
}
@bindThis
public onApplicationShutdown(signal?: string | undefined) {
clearInterval(this.intervalId);
}
}
// CPU STAT
function cpuUsage(): Promise<number> {
return new Promise((res, rej) => {
osUtils.cpuUsage((cpuUsage) => {
res(cpuUsage);
});
});
}
// MEMORY STAT
async function mem() {
const data = await si.mem();
return data;
}
// NETWORK STAT
async function net() {
const iface = await si.networkInterfaceDefault();
const data = await si.networkStats(iface);
return data[0];
}
// FS STAT
async function fs() {
const data = await si.disksIO().catch(() => ({ rIO_sec: 0, wIO_sec: 0 }));
return data ?? { rIO_sec: 0, wIO_sec: 0 };
}
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