winston 3.2.1 版本没有创建日志文件

Question

我尝试使用节点 js.winston 2.4.0 版本创建 winston（记录器文件），它成功地将信息和错误存储在日志中 file.but 最新版本它创建了日志文件，但无法存储错误和信息messages.How 修复它

Winston.js

var winston = require('winston');

const logger = winston.createLogger({
    level: 'info',
    format: winston.format.json(),
    defaultMeta: { service: 'user-service' },
    transports: [
      //
      // - Write to all logs with level `info` and below to `combined.log` 
      // - Write all logs error (and below) to `error.log`.
      //
      new winston.transports.File({ filename: 'error.log', level: 'error' }),
      new winston.transports.File({ filename: 'combined.log' })
    ]
  });
  
  //
  // If we're not in production then log to the `console` with the format:
  // `${info.level}: ${info.message} JSON.stringify({ ...rest }) `
  // 
  if (process.env.NODE_ENV !== 'production') {
    logger.add(new winston.transports.Console({
      format: winston.format.simple()
    }));
  }

app.js

/**
 * @fileoverview Root file of the application.
 */

// Import ExpressJS
const winston = require('winston');
const express = require('express');
const app = express();
// StartUp Processes
require('./startup/logging_error_startup');
require('./startup/routes_startup')(app);
require('./startup/check_security_key_startup')();
require('./startup/validation_startup')();
require('./startup/swagger_startup')(app);
require('./startup/production_startup')(app);
// Start the server
const port = process.env.PORT || 4202;
app.listen(port, () => winston.info(`Server Started and Listening on port ${port}`));

我得到了输出

winston] Attempt to write logs with no transports {"message":"Server Started and Listening on port 4202","level":"info"}

Answer 1

您需要将 Winston.js 文件中的记录器对象导入 app.js。在您的 app.js 代码中，Winston 导入是针对 npm 包的，而不是针对在 Winston.js 中创建的记录器对象。

在Winston.js中导出记录器对象：

var winston = require('winston');

const logger = winston.createLogger({
    level: 'info',
    format: winston.format.json(),
    defaultMeta: { service: 'user-service' },
    transports: [
      //
      // - Write to all logs with level `info` and below to `combined.log` 
      // - Write all logs error (and below) to `error.log`.
      //
      new winston.transports.File({ filename: 'error.log', level: 'error' }),
      new winston.transports.File({ filename: 'combined.log' })
    ]
  });

  //
  // If we're not in production then log to the `console` with the format:
  // `${info.level}: ${info.message} JSON.stringify({ ...rest }) `
  // 
  if (process.env.NODE_ENV !== 'production') {
    logger.add(new winston.transports.Console({
      format: winston.format.simple()
    }));
  }

module.exports = logger;

并且在 app.js 中，在导入后使用该记录器对象。

const logger = require('./Winston'); //assuming Winston.js is in the same folder level as app.js
const express = require('express');
const app = express();
// StartUp Processes
require('./startup/logging_error_startup');
require('./startup/routes_startup')(app);
require('./startup/check_security_key_startup')();
require('./startup/validation_startup')();
require('./startup/swagger_startup')(app);
require('./startup/production_startup')(app);
// Start the server
const port = process.env.PORT || 4202;
app.listen(port, () => logger.info(`Server Started and Listening on port ${port}`));

Answer 2

或者，您可以使用

修改winston.js中的默认记录器

var winston = require('winston');

const newLogger = winston.createLogger({
    level: 'info',
    format: winston.format.json(),
    defaultMeta: { service: 'user-service' },
    transports: [.........

winston.add(newLogger);

而不是

var winston = require('winston');

const logger = winston.createLogger({....

module.exports = logger

并使用

在每个文件中导入默认记录器

const logger = require('winston')

logger.info('log');

每次将记录器导入不同文件时无需处理相对路径。

winston 3.2.1 版本没有创建日志文件

winston 3.2.1 version is not creating log file

node.js

winston