使用nirvana-logger进行 nodejs 日志标准化

nirvana-logger 是一个简单的日志包，灵感来源于 debug 和 tracer

mesos部署 日志输出到console 的格式为 [时间] [文件] [scope] [content]

k8环境部署 日志输出为json 格式为 {serviceName, timestamp, file, scope, traceId, env, content}

特性

• 自动截断过长内容，默认截断长度为 512, 通过 .setLength() 更改截断长度

• 自动识别K8环境, 如果是K8则日志以 json 格式式输出到指定路径中，否则直接输出到 console

• 支持指定文件名 .setName(fileName)

• 支持日志串号设置 .setId(trackId)

安装

yarn add nirvana-logger@latest
# 或
npm i nirvana-logger@latest

package.json

用法

// filename: demo.js
const L = require('nirvana-logger')('注册')

const articles = {code: 200, message: '操作成功', result: [
	{titile: '标题', content: '内容'},
	{titile: '标题', content: '内容'},
]};

// 输出 js object
L('articles =>', articles);


const error = new Error('this is custom Error Object')
// 直接输出错误对象
L('error =>', error);

mesos部署方式输出到 console

k8部署输出json 格式为： {serviceName, timestamp, file, scope, traceId, env, content}

实例方法

• setId 设置串号,方便日志查询

  /**
  * 设置串号
  * @param {string} id - 设置串号
  * @return {logger} - 返回logger自身
  */
  logger.setId = function(traceId) {
   logger.traceId = traceId;
   return logger;
  };

  example

  const trackId = channelCode + ':' userId;
  L.setId(trackId);

• setMaxLength 别名setLength 设置日志截取长度，默认 512

  /**
   * 设置最大长度
   * @param length
   */
  logger.setLength = logger.setMaxLength = function(length = 512) {
    logger.strMaxLen = length;
    return logger;
  };

• setFileName 设置文件名

 /**
  * 设置文件名
  * @param fileName
  * @returns {logger}
  */
 logger.setName = logger.setFileName = function(fileName = '') {
   logger.fileName = fileName;
   return logger;
 };

单元测试

const fakeLog = (...args) => args;
const fs = require('fs');
const execSync = (cmd) => require('child_process').execSync(cmd, {encodeing: 'utf-8'});
const path = require('path');
const L = require('../')('scopeA');
L.setLog(fakeLog);
const sleep = (duration) => {
  return new Promise((resolve, reject) => {
    setTimeout(resolve('ok'), duration);
  });
};

describe('nirvana-logger test', () => {
  it('should has nameSpace', () => {
    const res = L('hello');
    expect(res[0].indexOf('scopeA') > 0).toBe(true);
  });
  it('should has trackId', () => {
    L.setId('ID:12345678');
    const res = L('trackId test');
    expect(L.traceId).toBe('ID:12345678');
    expect(res[0].indexOf('ID:12345678') > 0).toBe(true);
  });
  it('should has fileName', () => {
    const res = L('hello');
    expect(res[0].indexOf('logger.spec.js') > 0).toBe(true);
  });
  it('should support param is null', () => {
    const res = L(null);
    expect(res[1].indexOf('null') > 0).toBe(true);
  });
  it('should support param is undifined', () => {
    const res = L(undefined);
    expect(res[1].indexOf('undefined') > 0).toBe(true);
  });
  it('should support param is function', () => {
    const res = L(function() {});
    expect(res[1].indexOf('function') > 0).toBe(true);
  });
  it('数据量过大时应自动截断', () => {
    const res = L(require('../example/bigObject'));
    expect(res[1].length).toBe(true);
  });

  it('支持自定义输出字符长度', () => {
    const L1 = require('../')('scopeB');
    L1.setLog(fakeLog);
    L1.setMaxLength(2000);
    const res = L1(require('../example/bigObject'));
    expect(res[1].length > 1999).toBe(true);
  });

  it('when exist LOG_PATH && LOG_FILE_NAME, should output json', () => {
    const [LOG_PATH, LOG_FILE_NAME] = [__dirname, 'log0.json'];
    process.env.LOG_FILE_NAME = LOG_FILE_NAME;
    process.env.LOG_PATH = LOG_PATH;
    process.env.env = 'production';
    L.setMaxLength(4000);

    const logPath = path.join(LOG_PATH, LOG_FILE_NAME);
    execSync('rm -rf ' + logPath);
    const bigObject = require('../example/bigObject');
    L('[入参]', bigObject);
    L('[出参]', bigObject);
    expect(fs.existsSync(logPath)).toBe(true);
  });
});