puppeteer sample

puppeteer-crawler.js

const puppeteer = require("puppeteer");
const sendgrid = require("sendgrid").mail;
const sendgridApiKey = process.env.SENDGRID_API_KEY;
const fromEmail = "noreply@example.com";
const toEmail = "to@example.com";
const targetUrl = "https://example.com";

puppeteer.launch().then(async browser => {
    try {
        const page = await browser.newPage();
        await page.goto(targetUrl);
        const message = await page.mainFrame().evaluate(() => {
            try {
                var e = document.getElementsByClassName("SAMPLE")[0].children;
                for (var i = 0; i < e.length; i++) {
                    if ("SOLD OUT" === e[i].innerText) {
                        return "SOLD OUT";
                    }
                }
                return "NOW ON SALE";
            } catch (error) {
                console.log(error);
                return "BUSY";
            }
        });

        const subject = message;
        const content = new sendgrid.Content("text/plain", message);
        const mail = new sendgrid.Mail(fromEmail, subject, toEmail, content);

        const sendgridClient = require("sendgrid")(sendgridApiKey);
        const request = sendgridClient.emptyRequest({
            method: "POST",
            path: "/v3/mail/send",
            body: mail.toJSON()
        });

        sendgridClient.API(request, function (error, response) {
            if (error) {
                console.log("Error response received");
            }
            console.log(response.statusCode);
            console.log(response.body);
            console.log(response.headers);
        });

        console.log("status: " + status);
    } catch (error) {
        console.log(error);
    } finally {
        browser.close();
    }
});