单击测试按钮时，AWS Lambda函数将触发两次 [英] AWS lambda function firing twice when I click the Test button

问题描述

我正在使用chrome浏览器，当我单击屏幕右上角的测试"按钮时，lambda函数似乎启动了1-3次，我无法弄清楚为什么会发生这种情况.

I am using chrome browser and when I click the Test button in the top right side of my screen the lambda function seems to fire 1-3 times and I cannot figure out why this is happening.

我尝试将参数直接放入dynamoDB.get调用中，并进行了一段时间的搜索，并试图找到存在类似问题的人员.我发现有一些接近，但是没有一个谈论使用内置测试按钮时多次触发单个函数.我也尝试过使呼叫异步并等待它，但是全部无济于事.

I have tried putting the parameters directly into the dynamoDB.get call as well as googling for a while and trying to find someone with a similar issue. I found some that were close, but none that talk about a single function firing multiple times while using the built in test button. I have also tried making the call asynchronous and await it but all to no avail.

// Import Libraries
const aws = require('aws-sdk');
const dynamoDB = new aws.DynamoDB.DocumentClient();

aws.config.update({
    region: "us-east-1"
});

// Get Document
exports.handler = async (event, context) => {
    let params = {
       TableName: event.TableName,
        Key: {
            uuid: event.uuid
        } 
    };  

    return await dynamoDB.get(params, function(error, data){
        if(error){
            console.error("Error", error);
        }
        else{
            console.log("Data: ", data);
        }
    }).promise();
};

我希望该函数仅调用一次，但是更经常地在执行结果"区域中将相同的内容打印2-3次

I would expect the function to call only once but it more often prints the same thing 2-3 times in the Execution Results area

Response:
{
  "Item": {
    "userId": "112",
    "uuid": "0118bb6f-e361-42a6-85e5-043091b69389"
  }
}

Request ID:
"4f5ce9da-bbf2-408b-9175-2759f45ba4fe"

Function Logs:
START RequestId: 4f5ce9da-bbf2-408b-9175-2759f45ba4fe Version: $LATEST
2019-11-06T01:46:01.361Z    4f5ce9da-bbf2-408b-9175-2759f45ba4fe    
INFO    Data:  { Item:
   {
       "userId": "112",
       "uuid": "0118bb6f-e361-42a6-85e5-043091b69389"
   } } 

2019-11-06T01:46:01.441Z    4f5ce9da-bbf2-408b-9175-2759f45ba4fe    
INFO    Data:  { Item:
   {
       "userId": "112",
       "uuid": "0118bb6f-e361-42a6-85e5-043091b69389"
   } } 
2019-11-06T01:46:01.461Z    4f5ce9da-bbf2-408b-9175-2759f45ba4fe    
INFO    Data:  { Item:
   {
       "userId": "112",
       "uuid": "0118bb6f-e361-42a6-85e5-043091b69389"
   } } 
END RequestId: 4f5ce9da-bbf2-408b-9175-2759f45ba4fe
REPORT RequestId: 4f5ce9da-bbf2-408b-9175-2759f45ba4fe  Duration: 127.68 ms Billed Duration: 200 ms Memory Size: 128 MB Max Memory Used: 95 MB  

推荐答案

您正在提供一个回调方法，您正在同一API调用中请求一个Promise.

You are supplying a callback method and you are requesting a promise in the same API call.

您不应该两者都做.我建议删除回调，例如:

You should not do both. I recommend removing the callback, for example:

exports.handler = async (event, context) => {
    const params = {
       TableName: event.TableName,
        Key: {
            uuid: event.uuid
        } 
    };

    try {
        const data = await dynamoDB.get(params).promise();
        console.log("Data: ", data);
    } catch(error) {
        console.error("Error:", error);
    }
};

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