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lookup.ts
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lookup.ts
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import {Browser, Page, Response} from 'puppeteer';
import {Link, Store} from './model';
import {Print, logger} from '../logger';
import {Selector, cardPriceLimit, pageIncludesLabels} from './includes-labels';
import {closePage, delay, getSleepTime, isStatusCodeInRange} from '../util';
import {config} from '../config';
import {disableBlockerInPage} from '../adblocker';
import {fetchLinks} from './fetch-links';
import {filterStoreLink} from './filter';
import open from 'open';
import {processBackoffDelay} from './model/helpers/backoff';
import {sendNotification} from '../notification';
const inStock: Record<string, boolean> = {};
const linkBuilderLastRunTimes: Record<string, number> = {};
/**
* Responsible for looking up information about a each product within
* a `Store`. It's important that we ignore `no-await-in-loop` here
* because we don't want to get rate limited within the same store.
*
* @param browser Puppeteer browser.
* @param store Vendor of graphics cards.
*/
async function lookup(browser: Browser, store: Store) {
/* eslint-disable no-await-in-loop */
for (const link of store.links) {
if (!filterStoreLink(link)) {
continue;
}
if (config.page.inStockWaitTime && inStock[link.url]) {
logger.info(Print.inStockWaiting(link, store, true));
continue;
}
const page = await browser.newPage();
page.setDefaultNavigationTimeout(config.page.timeout);
await page.setUserAgent(config.page.userAgent);
if (store.disableAdBlocker) {
try {
await disableBlockerInPage(page);
} catch (error) {
logger.error(error);
}
}
let statusCode = 0;
try {
statusCode = await lookupCard(browser, store, page, link);
} catch (error) {
logger.error(`✖ [${store.name}] ${link.brand} ${link.series} ${link.model} - ${error.message as string}`);
}
// Must apply backoff before closing the page, e.g. if CloudFlare is
// used to detect bot traffic, it introduces a 5 second page delay
// before redirecting to the next page
await processBackoffDelay(store, link, statusCode);
await closePage(page);
}
/* eslint-enable no-await-in-loop */
}
async function lookupCard(browser: Browser, store: Store, page: Page, link: Link): Promise<number> {
const givenWaitFor = store.waitUntil ? store.waitUntil : 'networkidle0';
const response: Response | null = await page.goto(link.url, {waitUntil: givenWaitFor});
if (!response) {
logger.debug(Print.noResponse(link, store, true));
}
const successStatusCodes = store.successStatusCodes ?? [[0, 399]];
const statusCode = response?.status() ?? 0;
if (!isStatusCodeInRange(statusCode, successStatusCodes)) {
if (statusCode === 429) {
logger.warn(Print.rateLimit(link, store, true));
} else {
logger.warn(Print.badStatusCode(link, store, statusCode, true));
}
return statusCode;
}
if (await lookupCardInStock(store, page, link)) {
const givenUrl = link.cartUrl ? link.cartUrl : link.url;
logger.info(`${Print.inStock(link, store, true)}\n${givenUrl}`);
if (config.browser.open) {
if (link.openCartAction === undefined) {
await open(givenUrl);
} else {
await link.openCartAction(browser);
}
}
sendNotification(link, store);
if (config.page.inStockWaitTime) {
inStock[link.url] = true;
setTimeout(() => {
inStock[link.url] = false;
}, 1000 * config.page.inStockWaitTime);
}
if (config.page.screenshot) {
logger.debug('ℹ saving screenshot');
link.screenshot = `success-${Date.now()}.png`;
await page.screenshot({path: link.screenshot});
}
}
return statusCode;
}
async function lookupCardInStock(store: Store, page: Page, link: Link) {
const baseOptions: Selector = {
requireVisible: false,
selector: store.labels.container ?? 'body',
type: 'textContent'
};
if (store.labels.inStock) {
const options = {...baseOptions, requireVisible: true, type: 'outerHTML' as const};
if (!await pageIncludesLabels(page, store.labels.inStock, options)) {
logger.info(Print.outOfStock(link, store, true));
return false;
}
}
if (store.labels.outOfStock) {
if (await pageIncludesLabels(page, store.labels.outOfStock, baseOptions)) {
logger.info(Print.outOfStock(link, store, true));
return false;
}
}
if (store.labels.bannedSeller) {
if (await pageIncludesLabels(page, store.labels.bannedSeller, baseOptions)) {
logger.warn(Print.bannedSeller(link, store, true));
return false;
}
}
if (store.labels.maxPrice) {
let priceLimit;
let maxPrice = 0;
switch (link.series) {
case '3070':
priceLimit = await cardPriceLimit(page, store.labels.maxPrice, config.store.maxPrice3070, baseOptions);
maxPrice = config.store.maxPrice3070;
break;
case '3080':
priceLimit = await cardPriceLimit(page, store.labels.maxPrice, config.store.maxPrice3080, baseOptions);
maxPrice = config.store.maxPrice3080;
break;
case '3090':
priceLimit = await cardPriceLimit(page, store.labels.maxPrice, config.store.maxPrice3090, baseOptions);
maxPrice = config.store.maxPrice3090;
break;
default:
break;
}
if (priceLimit) {
logger.info(Print.maxPrice(link, store, priceLimit, maxPrice, true));
return false;
}
}
if (store.labels.captcha) {
if (await pageIncludesLabels(page, store.labels.captcha, baseOptions)) {
logger.warn(Print.captcha(link, store, true));
await delay(getSleepTime());
return false;
}
}
return true;
}
export async function tryLookupAndLoop(browser: Browser, store: Store) {
if (store.linksBuilder) {
const lastRunTime = linkBuilderLastRunTimes[store.name] ?? -1;
const ttl = store.linksBuilder.ttl ?? Number.MAX_SAFE_INTEGER;
if (lastRunTime === -1 || (Date.now() - lastRunTime) > ttl) {
try {
await fetchLinks(store, browser);
linkBuilderLastRunTimes[store.name] = Date.now();
} catch (error) {
logger.error(error.message);
}
}
}
logger.debug(`[${store.name}] Starting lookup...`);
try {
await lookup(browser, store);
} catch (error) {
logger.error(error);
}
const sleepTime = getSleepTime();
logger.debug(`[${store.name}] Lookup done, next one in ${sleepTime} ms`);
setTimeout(tryLookupAndLoop, sleepTime, browser, store);
}