im0o
b28fc572f7
os.totalmem() 底层是 sysinfo() 系统调用，LXC 里 lxcfs 只虚拟化 /proc 文件、拦不住系统调用，导致容器里显示的是宿主机的物理内存总量。 从 /proc/meminfo 读 MemTotal 才是容器限额，且与 MemAvailable 同源。
66 lines
2.1 KiB
TypeScript
66 lines
2.1 KiB
TypeScript
import { describe, expect, test } from 'bun:test'
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import {
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cpuUsageBetween,
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parseGateway,
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parseMemAvailable,
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parseMemTotal,
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parseNameservers,
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} from './host-info.ts'
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describe('parseMemTotal', () => {
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test('取 MemTotal 并换算成字节', () => {
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const meminfo = 'MemTotal: 2048000 kB\nMemFree: 100000 kB\nMemAvailable: 512000 kB\n'
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expect(parseMemTotal(meminfo)).toBe(2048000 * 1024)
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})
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test('读不到 /proc/meminfo（非 Linux 平台）返回 null', () => {
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expect(parseMemTotal('')).toBeNull()
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})
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})
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describe('parseMemAvailable', () => {
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test('取 MemAvailable 并换算成字节', () => {
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const meminfo = 'MemTotal: 2048000 kB\nMemFree: 100000 kB\nMemAvailable: 512000 kB\n'
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expect(parseMemAvailable(meminfo)).toBe(512000 * 1024)
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})
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test('没有这一行（老内核）返回 null', () => {
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expect(parseMemAvailable('MemTotal: 1 kB\nMemFree: 1 kB\n')).toBeNull()
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})
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})
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describe('parseGateway', () => {
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test('默认路由的网关按小端序倒回来', () => {
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// 0102A8C0 → c0.a8.02.01 → 192.168.2.1
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const table = [
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'Iface\tDestination\tGateway\tFlags\tRefCnt\tUse\tMetric\tMask\t\tMTU\tWindow\tIRTT',
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'eth0\t00000000\t0102A8C0\t0003\t0\t0\t0\t00000000\t0\t0\t0',
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'eth0\t0002A8C0\t00000000\t0001\t0\t0\t0\t00FFFFFF\t0\t0\t0',
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].join('\n')
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expect(parseGateway(table)).toBe('192.168.2.1')
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})
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test('没有默认路由返回 null', () => {
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const table = 'Iface\tDestination\tGateway\neth0\t0002A8C0\t00000000'
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expect(parseGateway(table)).toBeNull()
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})
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})
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describe('parseNameservers', () => {
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test('按出现顺序取 nameserver', () => {
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const conf = '# comment\nnameserver 223.5.5.5\nsearch lan\nnameserver 114.114.114.114\n'
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expect(parseNameservers(conf)).toEqual(['223.5.5.5', '114.114.114.114'])
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})
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})
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describe('cpuUsageBetween', () => {
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test('按两次快照的差值算百分比', () => {
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const usage = cpuUsageBetween({ busy: 100, total: 1000 }, { busy: 350, total: 2000 })
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expect(usage).toBe(25)
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})
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test('时间没有前进时返回 null', () => {
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expect(cpuUsageBetween({ busy: 1, total: 10 }, { busy: 1, total: 10 })).toBeNull()
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})
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})
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