手把手搭建koa2后端服务器-日志模块和文件上传

yarn add log4js
yarn add -D @types/log4js

log: {
    appenders: {
      out: { type: 'stdout' },
      app: {
        type: 'file',
        filename: 'logs/app.log',
        pattern: '-yyyy-MM-dd',
        maxLogSize: 10485760,
        numBackups: 3,
      },
    },
    categories: {
      default: { appenders: ['out', 'app'], level: 'info' },
    },
  }

import { configure, getLogger } from 'log4js';
import config from '../config';

configure(config.log);

export default getLogger();

import type { Context, Next } from 'koa';
import logger from '../utils/logger';

const logMiddleWare = () => {
  return async (ctx: Context, next: Next) => {
    const start = new Date();
    await next();
    const ms = new Date().getTime() - start.getTime();
    logger.info(`${ctx.method} ${ctx.url} - ${ms}ms`);
  };
};

export default logMiddleWare;

import logMiddleWare from './middlewares/logMiddleWare';

app.use(logMiddleWare());

// src/index.ts
KoaBody({
  // 启用表单解析，可以支持文件上传
  multipart: true,
  formidable: {
    // 文件上传路径
    uploadDir: './uploads',

    // 保持文件的扩展名
    keepExtensions: true,

    // 文件上传大小限制，默认5M
    maxFieldsSize: 5 * 1024 * 1024,

    // 保持文件的扩展名
    onFileBegin: (name, file) => {
      // 文件上传前的设置
      // console.log(name, file);
    },
  },
})

import { Context } from 'koa';
import type { Files, File as FileType } from 'formidable';

class IndexController {
  ......
  async upload(ctx: Context) {
    const files: Files | undefined = ctx.request.files;
    if (files) {
      const data: { url: string; name: string; size: number }[] = [];
      for (const key in files) {
        const file: FileType = files[key] as FileType;
        data.push({
          url: file.path,
          name: file.name!,
          size: file.size,
        });
      }
      response.success(ctx, data, '上传成功');
    } else {
      response.error(ctx, '上传失败');
    }
  }
}

// src/controller/common/view.ts
import IndexController from '../controller/common/view';

router.post('/upload', IndexController.upload);