AWS Lambdaの言語サポート状況を取得する為のLambda Function

app.js

const axios = require('axios');
const cheerio = require('cheerio');

const url = 'https://docs.aws.amazon.com/ja_jp/lambda/latest/dg/lambda-runtimes.html';

let $;
let response;

/**
 *
 * Event doc: https://docs.aws.amazon.com/apigateway/latest/developerguide/set-up-lambda-proxy-integrations.html#api-gateway-simple-proxy-for-lambda-input-format
 * @param {Object} event - API Gateway Lambda Proxy Input Format
 * @param {string} event.resource - Resource path.
 * @param {string} event.path - Path parameter.
 * @param {string} event.httpMethod - Incoming request's method name.
 * @param {Object} event.headers - Incoming request headers.
 * @param {Object} event.queryStringParameters - query string parameters.
 * @param {Object} event.pathParameters - path parameters.
 * @param {Object} event.stageVariables - Applicable stage variables.
 * @param {Object} event.requestContext - Request context, including authorizer-returned key-value pairs, requestId, sourceIp, etc.
 * @param {Object} event.body - A JSON string of the request payload.
 * @param {boolean} event.body.isBase64Encoded - A boolean flag to indicate if the applicable request payload is Base64-encode
 *
 * Context doc: https://docs.aws.amazon.com/lambda/latest/dg/nodejs-prog-model-context.html 
 * @param {Object} context
 * @param {string} context.logGroupName - Cloudwatch Log Group name
 * @param {string} context.logStreamName - Cloudwatch Log stream name.
 * @param {string} context.functionName - Lambda function name.
 * @param {string} context.memoryLimitInMB - Function memory.
 * @param {string} context.functionVersion - Function version identifier.
 * @param {function} context.getRemainingTimeInMillis - Time in milliseconds before function times out.
 * @param {string} context.awsRequestId - Lambda request ID.
 * @param {string} context.invokedFunctionArn - Function ARN.
 *
 * Return doc: https://docs.aws.amazon.com/apigateway/latest/developerguide/set-up-lambda-proxy-integrations.html
 * @returns {Object} object - API Gateway Lambda Proxy Output Format
 * @returns {boolean} object.isBase64Encoded - A boolean flag to indicate if the applicable payload is Base64-encode (binary support)
 * @returns {string} object.statusCode - HTTP Status Code to be returned to the client
 * @returns {Object} object.headers - HTTP Headers to be returned
 * @returns {Object} object.body - JSON Payload to be returned
 * 
 */
exports.lambdaHandler = async (event, context) => {
    try {
        const res = await axios(url);
        verInfos = getVerInfos(res.data);
        response = {
            'statusCode': 200,
            'body': JSON.stringify({
                result: verInfos
            })
        }
    } catch (err) {
        console.log(err);
        return err;
    }

    return response
};

function getVerInfos(html) {
    $ = cheerio.load(html);

    const h = {};

    h.node = getLangInfos('w370aac27c17');
    h.java = getLangInfos('w370aac27c21');
    h.python = getLangInfos('w370aac27c25');
    h.go = getLangInfos('w370aac27c29');
    h.dotnet = getLangInfos('w370aac27c33');

    return h;
}

function getLangInfos(id) {
    const infos = [];

    const colCount = $("#" + id  + " > tbody > tr > th").length;
    const elems = $('#' + id + ' > tbody > tr > td');
    elems.each(function(i, elem) {
      if (i % colCount == 0) {
        infos.push($(elem).text().trim());
      }
    });

    return infos;
}

実行結果例。 body → result に 「言語名:[対応バージョン一覧配列]」という形式で出力

{"statusCode":200,"body":"{\"result\":{\"node\":[\"Node.js 8.10\",\"Node.js 6.10\"],\"java\":[\"Java 8\"],\"python\":[\"Python 3.6\",\"Python 3.7\",\"Python 2.7\"],\"go\":[\"Go 1.x\"],\"dotnet\":[\".NET Core 2.1\",\".NET Core 2.0\",\".NET Core 1.0\"]}}"}