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AWS LambdaAdvent Calendar 2014

Day 1

Lambdaからhttpリクエスト

Last updated at Posted at 2014-11-30

#Lambdaからhttpリクエスト
この記事はAWS Lambda Advent Calendar 2014へのエントリー記事です。

Lambdaでは、node.js標準のモジュールが利用可能です。これを利用してhttpリクエスト[[1]][link-1]を実行してみました。

http://aws.amazon.com/lambda/faqs/
Q: What languages does AWS Lambda support?
At launch AWS Lambda supports code written in Node.js (JavaScript). Your code can include existing Node.js libraries, even native ones.

Function

var http = require ('http');
exports.handler = function(event, context) {
    console.log('value1 = ' + event.key1);
    http.get("http://www.google.com/index.html", function(res) {
        console.log("Got response: " + res.statusCode);
        
        res.on("data", function(chunk) {
            context.done(null, chunk);
        });
    }).on('error', function(e) {
        context.done('error', e);
    });
};

出力

Logs
----
START RequestId: 8e2c889c-74a0-11e4-b6d0-73063f569a63
2014-11-25T12:42:57.815Z	8e2c889c-74a0-11e4-b6d0-73063f569a63	value1 = value1
2014-11-25T12:42:57.968Z	8e2c889c-74a0-11e4-b6d0-73063f569a63	Got response: 200
END RequestId: 8e2c889c-74a0-11e4-b6d0-73063f569a63
REPORT RequestId: 8e2c889c-74a0-11e4-b6d0-73063f569a63	Duration: 221.39 ms	Billed Duration: 300 ms 	Memory Size: 128 MB	Max Memory Used: 10 MB	

Message
-------
<!doctype html><html itemscope="" itemtype="http://schema.org/WebPage" lang="en"><head><meta content="Search the world's information, including webpages, images, videos and more. Google has many special features to help you find exactly 
...

終わりに

コールバックに初挑戦しました。動くものができるまで、様々な紆余曲折がありました。

参考文献

[1] http://nodejs.org/api/http.html#http_http_get_options_callback
[link-1]: http://nodejs.org/api/http.html#http_http_get_options_callback

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