2020-10-13 log4js配置和使用、node端请求封装（开箱即用）

按日期创建log文件、error和res分别在两个文件夹

//  /config/log4js_config.js
module.exports = {
  appenders: {
    // 默认日志
    console: {
      type: 'console',
    },
    //错误日志
    errorLogger: {
      // category: 'errorLogger', //logger名称
      type: 'dateFile', //日志类型
      filename: 'logs/error/error', // 日志输出位置
      alwaysIncludePattern: true, // 是否总是有后缀名
      pattern: 'yyyy-MM-dd.log', // 后缀
    },
    //响应日志
    resLogger: {
      // category: 'resLogger',
      type: 'dateFile',
      filename: 'logs/response/response',
      alwaysIncludePattern: true,
      pattern: 'yyyy-MM-dd.log',
    },
  },
  //设置logger名称对应的的日志等级
  categories: {
    default: {
      appenders: ['console'],
      level: 'All',
    },
    errorLogger: {
      appenders: ['errorLogger'],
      level: 'error',
    },
    resLogger: {
      appenders: ['resLogger'],
      level: 'all',
    },
  },
};

封装打印内容

//  /utils/log_util.js
const log4js = require('log4js');
const loggerConfig = require('../config/log4js_config');
// 加载配置文件
log4js.configure(loggerConfig);
const logger = {};
const errorLogger = log4js.getLogger('errorLogger');
const resLogger = log4js.getLogger('resLogger');
// 封装错误日志
logger.logError = (error, resTime, requestBody) => {
  if (error) {
    errorLogger.error(formatError(error, resTime, requestBody));
  }
};
// 封装响应日志
logger.logResponse = (response, resTime, requestBody) => {
  if (response) {
    resLogger.info(formatRes(response, resTime, requestBody));
  }
};
// 封装控制台打印
logger.log = title => {
  return log4js.getLogger(title);
};
// 格式化响应日志
const formatRes = (response, resTime, requestBody) => {
  let logText = '';
  // 响应日志开始
  logText += '\n' + '*************** response log start ***************' + '\n';
  // 添加请求日志
  logText += formatReqLog(response.request, resTime, requestBody);
  // 响应状态码
  logText += 'response statusCode: ' + response.statusCode + '\n';
  // 响应内容
  logText += 'response body: ' + '\n' + JSON.stringify(response.body) + '\n';
  // 响应日志结束
  logText += '*************** response log end ***************' + '\n';
  return logText;
};
// 格式化错误日志
const formatError = (err, resTime, requestBody) => {
  let logText = '';
  // 错误信息开始
  logText += '\n' + '*************** error log start ***************' + '\n';
  // 添加请求日志
  logText += formatReqLog(err.options, resTime, requestBody);
  // 错误名称
  logText += 'err name: ' + err.name + '\n';
  // 错误信息
  logText += 'err message: ' + err.message + '\n';
  // 错误详情
  logText += 'err stack: ' + err.stack + '\n';
  // 错误信息结束
  logText += '*************** error log end ***************' + '\n';
  return logText;
};
// 格式化请求日志
const formatReqLog = (req, resTime, requestBody) => {
  let logText = '';
  const method = req.method;
  // 访问方法
  logText += 'request method: ' + method + '\n';
  // 请求原始地址
  logText += 'request originalUrl:  ' + (req.uri && req.uri.href || req.uri) + '\n';
  // 请求参数
  if (method === 'GET') {
    logText += 'request query:  ' + JSON.stringify(req.uri.query) + '\n';
  } else {
    logText += 'request body: ' + '\n' + JSON.stringify(requestBody) + '\n';
  }
  // 服务器响应时间
  logText += 'response time: ' + resTime + 'ms' + '\n';
  return logText;
};
module.exports = logger;

request时使用（同时也是node端请求封装）

//  /utils/request.js
const rp = require('request-promise');
const axios = require('axios');
const config = require('../config/constants');
const logger = require('./log_util');
const requestConfig = {
  baseUrl: config.baseUrl,
  resolveWithFullResponse: false
};
const rpWithLogger = (options, bodyKey) => {
  const startTime = new Date();
  let ms = 0;
  return rp(options).then(
    res => {
      ms = new Date() - startTime;
      logger.logResponse(res, ms, options[bodyKey]);
      return res.body;
    },
    err => {
      ms = new Date() - startTime;
      logger.logError(err, ms, options[bodyKey]);
      return { code: 504, msg: '网关超时', err };
    }
  );
};
exports.get = (uri, param = {}, opts) => {
  const options = {
    uri,
    method: 'GET',
    qs: param,
    ...requestConfig,
    ...opts
  };
  return rpWithLogger(options, 'param');
};
exports.post = (uri, body, opts) => {
  const options = {
    uri,
    method: 'POST',
    body: body,
    ...requestConfig,
    ...opts,
    json: true,
    resolveWithFullResponse: true
  };
  return rpWithLogger(options, 'body');
};
exports.upload = (uri, formData, opts) => {
  const options = {
    uri,
    method: 'POST',
    formData: formData,
    ...requestConfig,
    ...opts
  };
  return rp(options);
};
exports.download = (uri, param = {}, opts) => {
  // 此处用 axios 请求，定义 responseType 为 stream 进行下载
  return axios.get(config.baseUrl + uri, {
    responseType: 'stream', // 注意此处要用 stream
    params: param,
    data: {},
    ...opts
  });
};

配置内容需根据需求自行修改，当然不修改也能用。
完整koa模板示例：https://www.yuque.com/xiebugde/mbz0hg/tg5c7c