AWS Lambda未执行node.js MySQL查询

我工作的公司目前正试图将我们现有的一些代码库迁移到AWS Lambda。我们正在运行node.js 4.3（为lambda提供的最高版本），我们正在VPC内执行，以连接到RDS数据库。Lambda函数很好地连接到数据库，但是对MySQL表的简单select查询没有执行或返回任何错误。下面是我们正在尝试的代码：

exports.handler = (event, context, callback) => {

  /**
   * Require Config file
  **/
  var config = require('./config.js');

  /**
   * AWS/MWS Configuration
  **/
  var AWS = require('aws-sdk');
  var MWS = require('mws');

  var mws           = require('./lib/mws-reports/lib/mws.js');
  var XML           = require('./lib/mws-reports/pixl-xml');
  var mwsReportsAPI = require('./lib/mws-reports/lib/reports.js');
  var mwsFeedsAPI   = require('./lib/mws-reports/lib/feeds.js');

  AWS.config.region      = config.AWS.region;
  AWS.config.credentials = config.AWS.credentials;

  var client = new mws.Client(
    config.MWS.credentials.accessKeyId,
    config.MWS.credentials.secretAccessKey,
    config.MWS.credentials.sellerID,
    {}
  );

  /**
   * Configure DB
   * @var Promise - A library to maintain Promises (used for chained MySQL queries)
   * @var Utils - A wrapper for utility functions.
   * @var connection - The MySQL DB Connection
  **/
  var Promise = require('bluebird');
  var utils   = require('./lib/Utils');
  var mysql = require('mysql');

  var MySQLConnection = mysql.createConnection(config.mysql);

  MySQLConnection.connect(function (err) {
    if(err) {
      console.log("Error connection: " + err.stack);
      return;
    }

    console.log("Connected as id " + connection.threadId);
  });

  var connection      = Promise.promisifyAll(MySQLConnection);
  var InventoryHealth = require('./app/models/InventoryHealth');
  var Items           = require('./app/models/Items');

  connection.query("SELECT * FROM items", function(err, rows) {
    rows.forEach(function(item) {
      console.log(JSON.stringify(item));
    });
  });

  connection.end();
  context.done(null, "Finished :)");
}

正如我提到的，所有这些中最奇怪的部分是我从Lambda那里得不到回应。这就是它告诉我的一切：

START RequestId: f726f0ba-ecec-11e6-b0b3-9d51c554a5ac Version: $LATEST
2017-02-07T04:22:01.123Z    f726f0ba-ecec-11e6-b0b3-9d51c554a5ac    (node) crypto.createCredentials is deprecated. Use tls.createSecureContext instead.
END RequestId: f726f0ba-ecec-11e6-b0b3-9d51c554a5ac
REPORT RequestId: f726f0ba-ecec-11e6-b0b3-9d51c554a5ac  Duration: 4232.01 ms    Billed Duration: 4300 ms    Memory Size: 128 MB Max Memory Used: 22 MB

---

任何建议都会令人惊讶。多谢各位

您没有正确使用回调。请仔细阅读。并记住在处理程序外部初始化模块，以便更快地执行函数

如果不看代码的功能，我也没有测试过这段代码，那么您还需要以下几行代码：

  /**
   * Require Config file
  **/
  var config = require('./config.js');

  /**
   * AWS/MWS Configuration
  **/
  var AWS = require('aws-sdk');
  var MWS = require('mws');

  var mws           = require('./lib/mws-reports/lib/mws.js');
  var XML           = require('./lib/mws-reports/pixl-xml');
  var mwsReportsAPI = require('./lib/mws-reports/lib/reports.js');
  var mwsFeedsAPI   = require('./lib/mws-reports/lib/feeds.js');

  AWS.config.region      = config.AWS.region;
  AWS.config.credentials = config.AWS.credentials;

  var client = new mws.Client(
    config.MWS.credentials.accessKeyId,
    config.MWS.credentials.secretAccessKey,
    config.MWS.credentials.sellerID,
    {}
  );

  /**
   * Configure DB
   * @var Promise - A library to maintain Promises (used for chained MySQL queries)
   * @var Utils - A wrapper for utility functions.
   * @var connection - The MySQL DB Connection
  **/
  var Promise = require('bluebird');
  var utils   = require('./lib/Utils');
  var mysql = require('mysql');

  var InventoryHealth = require('./app/models/InventoryHealth');
  var Items           = require('./app/models/Items');

  exports.handler = (event, context, callback) => {

    var MySQLConnection = mysql.createConnection(config.mysql);

    MySQLConnection.connect(function (err) {
      if(err) {
        console.log("Error connection: " + err.stack);
        callback(err, err);
      } else {

        console.log("Connected as id " + connection.threadId);

        var connection      = Promise.promisifyAll(MySQLConnection);


        connection.query("SELECT * FROM items", function(err, rows) {
          if (err) {
            console.log(err);
            callback(err, err);
          } else {
            rows.forEach(function(item) {
              console.log(JSON.stringify(item));
            });
            connection.end();
            callback(null, rows);
          }
        });


      }
});


}

---

第一：所有模块的初始化都应该在处理程序函数之外进行。第二：你需要仔细阅读回调是如何工作的。在调用context.done之前，您不会等待回调被调用。我的建议是阅读javascript/节点回调以及如何使用它们。这很有效，非常感谢！我一定会读更多关于回调的内容。