AWS Lambda“完成请求前进程退出" [英] AWS Lambda "Process exited before completing request"

问题描述

我正在尝试调用 DynamoDB 客户端方法并从 DynamoDB 表中获取一项.我正在使用 AWS Lambda.但是，我不断收到消息:

I am trying to call a DynamoDB client method and get one item from the DynamoDB table. I am using AWS Lambda. However, I keep getting the message:

完成请求前进程退出."

"Process exited before completing request."

我增加了超时时间只是为了确保，但处理时间小于超时时间.有什么建议吗?

I have increased the timeout just to make sure, but the processing time is less than the timeout. Any advice?

console.log('Loading event');
var AWS = require('aws-sdk');
var dynamodb = new AWS.DynamoDB({apiVersion: '2012-08-10'});

exports.handler = function(event, context) {
dynamodb.listTables(function(err, data) {
});

var params = {
    "TableName": "User",
     "Key":
        {"User Id"   : {"S":event.objectId}
    },
    "AttributesToGet"   : ["First Name","Last Name", "Latitude", "Longitude"],
    "ConsistentRead"    : true
  }


   dynamodb.getItem(params, function(response,result) {
    response.on('data', function(chunk){
    console.log(""+chunk);
    console.log("test1")
    context.done(result);
});
result.on('ready', function(data){
    console.log("test2")
    console.log("Error:" + data.error);
    console.log("ConsumedCapacityUnits:" + data.ConsumedCapacityUnits);
     context.done('Error',data);
    // ...
});
});
};

推荐答案

消息Process exited before completed request"表示Javascript函数在调用context.done(或context.succeed 等).通常，这意味着您的代码中存在一些错误.

The message "Process exited before completing request" means that the Javascript function exited before calling context.done (or context.succeed, etc.). Usually, this means that there is some error in your code.

我不是 Javascript 专家(根本)所以可能有更优雅的方法来查找错误，但我的方法是在我的代码中放入一堆 console.log 消息，运行它，然后查看日志.我通常可以将违规行归零，如果我看的时间足够长，我通常可以找出我的错误.

I'm not a Javascript expert (at all) so there may be more elegant ways to find the error but my approach has been to put a bunch of console.log messages in my code, run it, and then look at the logs. I can usually zero in on the offending line and, if I look at it long enough, I can usually figure out my mistake.

我看到你已经有一些日志记录了.您在输出中看到了什么?

I see you have some logging already. What are you seeing in the output?

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