AWS Lambda“在完成请求之前退出流程" [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:

在完成请求之前，进程已退出."

"Process exited before completing request."

为了确保这一点，我增加了超时时间，但是处理时间少于超时时间.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

消息在完成请求之前退出流程"表示Javascript函数在调用context.done(或context.succeed等)之前退出.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.

(我根本不是)JavaScript专家，因此可能有更优雅的方法来发现错误，但是我的方法是在代码中放入一堆console.log消息，然后运行它，然后查看日志.通常，我可以在违规行中归零，如果我看了足够长的时间，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.

我看到您已经有一些日志记录了.您在输出中看到什么?

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

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