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使用sendgrid和node.js将日志文件附加到电子邮件

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我试图在一个简单的node.js应用程序中发送一封电子邮件，其中的日志文件只是使用log4js创建的。我可以发送带有sendgrid的电子邮件，它具有附件，但是附件为空。任何帮助，将不胜感激。这是app.js代码：

const fs = require('fs');
require('dotenv').config();
const sub = require('./app-sub');
const log = require('./logger').logger.getLogger('app');

// Make some log entries out to console and to app.log
log.info('******************************')
log.info('Start test1')
log.info('')
log.trace("trace message")
log.debug("Some debug messages");
log.info("some info")
log.warn("a warning")
log.error("an error")
log.fatal("a fatal error")

// Call a function in another file to test
sub.sub_funct1();

log.info('')
log.info('******************************')
log.info('End test1')

// Send email with log as attachment
const sgMail = require('@sendgrid/mail');
sgMail.setapiKey(process.env.SENDGRID_API_KEY);

// Read log file base 64
path = 'app.log';
attachment = fs.readFileSync(path,{ encoding: 'base64' });

const msg = {
  to: 'dgarvin57@gmail.com',from: 'darvin57@gmail.com',subject: 'Test email 1',text: 'Results sent from log_test',html: '<strong>and easy to do anywhere,even with Node.js</strong>',attachments: [
    {
      content: attachment,filename: 'app.log',type: 'text/html',// plain/text application/pdf
      disposition: 'attachment',content_id: 'app.log'
      // inline,attachment
    },],};
sgMail.send(msg)
  .then(result => { })
  .catch(err => console.log(err.response.body));

和logger.js中的log4js记录器配置：

const log4js = require('log4js');
const level = process.env.NODE_LOGGING_LEVEL || 'debug';

log4js.configure({
  appenders: {
    app: { type: 'file',flags: 'w' },out: { type: 'stdout' },},categories: { default: { appenders: ['out','app'],level: level } }
});

module.exports.logger = log4js;

运行它时，我在终端以及与app.js相同的文件夹中的app.log文件中看到日志输出：

[2019-12-25T15:43:46.677] [INFO] app - ******************************
[2019-12-25T15:43:46.679] [INFO] app - Start test1
[2019-12-25T15:43:46.680] [INFO] app -  
[2019-12-25T15:43:46.688] [DEBUG] app - Some debug messages 
[2019-12-25T15:43:46.689] [INFO] app - some info 
[2019-12-25T15:43:46.690] [WARN] app - a warning 
[2019-12-25T15:43:46.691] [ERROR] app - an error
[2019-12-25T15:43:46.691] [FATAL] app - a fatal error
[2019-12-25T15:43:46.692] [INFO] app - some info from app-sub
[2019-12-25T15:43:46.692] [INFO] app -  
[2019-12-25T15:43:46.692] [INFO] app - ****************************** 
[2019-12-25T15:43:46.693] [INFO] app - End test1

该电子邮件连同名为app.log的附件发送到我的Gmail帐户。但是当我打开它时，它是空白的。因此，不确定在发送电子邮件时是否在文本文件或附件部分的base64转换上失败。提前致谢。

zhansir720 回答：使用sendgrid和node.js将日志文件附加到电子邮件

那时我能够使它工作，并希望记录解决方案。我认为关键是要先关闭日志文件，因为当它仍在使用时无法附加。这是关闭日志文件并调用我的sendEmail实用程序功能的代码：

log.shutown;
email.sendEmail(to,subject,body,logPath)

这是sendMail函数：

require('dotenv').config();
const sgMail = require('@sendgrid/mail');
const fs = require('fs');

function sendEmail(to,attachmentPath) {

  // Send email with log as attachment
  sgMail.setApiKey(process.env.SENDGRID_API_KEY);

  const msg = {
    to: to,from: 'myEmail@gmail.com',subject: subject,text: 'Results:',html: body
  };

  // Read log file base 64
  if (attachmentPath != undefined) {
    attachment = fs.readFileSync(attachmentPath,{ encoding: 'base64' });
    msg.attachments = [
      {
        content: attachment,filename: attachmentPath,type: 'text/plain',disposition: 'attachment'
      },]
  } else {
    msg.attachments = undefined;
  }

  sgMail.send(msg)
    .then(result => { })
    .catch(err => console.log(err.response.body));
}
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