AWS Lambda TypeError：無法讀取未定義的屬性“ toString”

Question

我有一個nodejs lambda函數，其中的代碼由toString（）函數組成，通常用於將某些東西轉換為字符串值。

當我直接在AWS lambda的控制台中編寫代碼時，它的工作原理非常完美，但是當我使用S3存儲桶上傳相同的功能時，它將引發以下錯誤

TypeError: Cannot read property 'toString' of undefined 
at Response.<anonymous> (/var/task/GetAssetMobile3.js:46:40) 
at Request.<anonymous> (/var/task/node_modules/aws-sdk/lib/request.js:355:18) 
at Request.callListeners (/var/task/node_modules/aws-sdk/lib/sequential_executor.js:105:20) 
at Request.emit (/var/task/node_modules/aws-sdk/lib/sequential_executor.js:77:10) 
at Request.emit (/var/task/node_modules/aws-sdk/lib/request.js:615:14) 
at Request.transition (/var/task/node_modules/aws-sdk/lib/request.js:22:10) 
at AcceptorStateMachine.runTo (/var/task/node_modules/aws-sdk/lib/state_machine.js:14:12) 
at /var/task/node_modules/aws-sdk/lib/state_machine.js:26:10 
at Request.<anonymous> (/var/task/node_modules/aws-sdk/lib/request.js:38:9) 
at Request.<anonymous> (/var/task/node_modules/aws-sdk/lib/request.js:617:12

功能碼：

"use strict"; 

var AWS = require('aws-sdk');
var s3 = new AWS.S3();
var lambda = new AWS.Lambda();
var pg = require('pg');
console.log('Loading function');
exports.handler = function(event, context, callback) {

var userName=event.headers.username;
var passWord=event.headers.password;
var partybranchid ="event.body.FieldValue";
var modifiedon="event.body.ModifiedON";
var RES;
var params = {
        FunctionName: 'ServiceAuthentication', 
        InvocationType: 'RequestResponse',
        LogType: 'Tail',
        Payload: '{ "userName": "'+userName+'","passWord": "'+passWord+'" }'
};
lambda.invoke(params, function(err, data) {
    if (err) {
      context.fail(err);
      console.log("Response is not received error in login invoking function ");
    } else {
      var response=data.Payload;
      var auth=response.replace('"true"','true');
      if(auth === 'true'){
          console.log("authentication is true continue process");
          s3.getObject({
                Bucket: 'awslambdaoregon',
                Key: 'DBURL.txt'
              }, function (err, data) {
                  if(err){
                      console.log('calling s3 DBURL file  failed ');
                  }
              });
          var  connectionString=data.Body.toString();     
          var client = new pg.Client(connectionString);
          client.connect(function(err) {   
            if(err) {
                  console.log(err);
                }else{
            var Query ='select * from masset where partybranchid='+partybranchid+';

            console.log('executing query',Query);
            client.query(Query, function(err, result) {

             if(err){
               console.log('Error in executing Query');
               client.end();
             } else {
   console.log(' executing Query successful');
                 }
             }
            });}
          });

      }else{
           RES = '{"ResponseJSON":{"Body":{"Datalist":{"Authentication":'+response+'}}}}'; 
      }
     callback(null, JSON.parse(RES));
    }
    });
};

在上面的代碼行中， var connectionString = data.Body.toString（）; 正在將接收到的數據轉換為字符串，但toString（）無法正常工作。 如何克服此錯誤，我是否想在node_module文件夾中安裝某些東西？

Answer 1

調用時是否傳遞了數據對象？ 對我來說，似乎沒有定義Body，這就是為什么您不能調用toString（）的原因。