Question

我正在尝试在AWS Lambda上实现一个简单的Node Js示例，
该代码具有Async库的示例示例。
该代码可以正常工作，但是由于某种原因Lambda函数返回空响应。
我也是Node的新手，请帮忙。

以下是代码-

var async = require('async');

exports.handler = async (event, context, callback) => {
    async.waterfall([
        function(callback) {
            console.log("ONE");
            callback(null, 1);
        },
        function(resp, callback) {
            console.log("TWO : ", resp);
            callback(null, 2);
        },
        function(resp, callback){
            console.log("THREE : ", resp);
            callback(null, "Done");
        }
    ],
    function(err, resp) {
        let response = {};
        if (err) {
            console.log("Error",err);
            response = {
                statusCode: 500,
                body: JSON.stringify('Error!'),
            };
            return response;
        } else {
            console.log("Success",resp);
            response = {
                statusCode: 200,
                body: JSON.stringify('Ok!'),
            };
            return response;
        }
    });
};

以下是CloudWatch日志-

START RequestId: ab9aa426-dfc9-44ac-8d96-a4f102e30861 Version: $LATEST
2019-03-21T15:15:26.597Z    ab9aa426-dfc9-44ac-8d96-a4f102e30861    ONE
2019-03-21T15:15:26.597Z    ab9aa426-dfc9-44ac-8d96-a4f102e30861    TWO :  1
2019-03-21T15:15:26.597Z    ab9aa426-dfc9-44ac-8d96-a4f102e30861    THREE :  2
2019-03-21T15:15:26.597Z    ab9aa426-dfc9-44ac-8d96-a4f102e30861    Success Done
END RequestId: ab9aa426-dfc9-44ac-8d96-a4f102e30861
REPORT RequestId: ab9aa426-dfc9-44ac-8d96-a4f102e30861  Duration: 37.28 ms  Billed Duration: 100 ms     Memory Size: 128 MB Max Memory Used: 67 MB

我使用了示例节点蓝图，该蓝图很好用-

exports.handler = async (event) => {
    // TODO implement
    const response = {
        statusCode: 200,
        body: JSON.stringify('Hello from Lambda!'),
    };
    return response;
};

Answer 1

由于您已经在使用Node 8，因此不再需要使用过时的，令人困惑的X_方法。请改用callback

await

其中somePromise1，somePromise2和somePromise3是您承诺的回调。

有关异步/等待here的更多信息。

Answer 2

尝试从处理程序中删除exports.handler = async (event) => { try { await somePromise1 await somePromise2 await somePromise3 console.log("Success", resp); response = { statusCode: 200, body: JSON.stringify('Ok!'), }; return response; } catch (e) { console.log("Error", err); response = { statusCode: 500, body: JSON.stringify('Error!'), }; return response; } };，并使用async而不是返回值：

callback

AWS Lambda NodeJ无法返回响应

2 个答案: