Initial commit

Author: Prince25

beep.js

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+import beep from "beepbeep";
+
+export default async function threeBeeps() {
+    beep([1000, 500, 1000])
+} 

main.js

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+import costco from './stores/costco.js'
+import bestbuy from './stores/bestbuy.js'
+import amazon from './stores/amazon.js'
+
+
+// All the products to check
+// Current domains supported: Costco, Best Buy, Amazon, 
+// Format: https://www.XXX.com/...
+const URLS = [
+    // "https://www.bestbuy.com/site/amd-ryzen-9-5900x-4th-gen-12-core-24-threads-unlocked-desktop-processor-without-cooler/6438942.p?skuId=6438942",
+    // "https://www.costco.com/sony-playstation-5-gaming-console-bundle.product.100691489.html",
+    "https://www.amazon.com/gp/product/B08164VTWH/",
+    // 'https://www.amazon.com/Coredy-Super-Strong-Automatic-Self-Charging-Medium-Pile/dp/B07NPNN57S'
+]
+
+// How often to check for products. Too often may be dangerous, especially for Amazon.
+const INTERVAL = {
+    unit: 'seconds',  // seconds, m: minutes, h: hours
+    value: 25
+}
+
+
+// https://www.XXX.com/... -> XXX
+function getDomainName(url) {
+    let hostName = new URL(url).hostname;
+    let host = hostName.split('.');
+    return host[1];
+}
+
+
+// Calls the given store function with the set interval 
+async function checkStore(storeFunc, url) {
+    let timer;
+    switch(INTERVAL.unit) {
+        case 'seconds':
+            timer = setInterval(storeFunc, INTERVAL.value * 1000, url, INTERVAL)
+            break;
+
+        case 'minutes':
+            timer = setInterval(storeFunc, INTERVAL.value * 1000 * 60, url, INTERVAL)
+            break;
+
+        case 'hours':
+            timer = setInterval(storeFunc, INTERVAL.value * 1000 * 60 * 60, url, INTERVAL)
+            break;
+    }
+}
+
+
+URLS.forEach(url => {
+    let storeName;
+    try {
+        storeName = getDomainName(url);
+    } catch(e) {
+        console.error('Incorrect URL format:', url)
+        console.error(e)
+    }
+    
+    switch(storeName) {
+        case 'costco':
+            checkStore(costco, url);
+            break;
+
+        case 'bestbuy':
+            checkStore(bestbuy, url);
+            break;
+
+        case 'amazon':
+            checkStore(amazon, url);
+            break;
+
+        default:
+            console.error('This store is not supported:', storeName)
+    }
+})

package-lock.json

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+{
+    "type": "module",
+    "dependencies": {
+        "axios": "^0.21.0",
+        "beepbeep": "^1.3.0",
+        "dom-parser": "^0.1.6",
+        "moment": "^2.29.1"
+    }
+}

package.json

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+import { fileURLToPath } from "url";
+import fs from "fs";
+import threeBeeps from "../beep.js"
+import axios from "axios";
+import moment from "moment";
+import DomParser from "dom-parser";     // https://www.npmjs.com/package/dom-parser
+
+
+if (process.argv[1] === fileURLToPath(import.meta.url)) {
+    let interval = {
+        unit: 'seconds',    // seconds, m: minutes, h: hours
+        value: 30           // Amazon detects bots if too low, do > 10 seconds
+    }
+    let url = 'https://www.amazon.com/Coredy-Super-Strong-Automatic-Self-Charging-Medium-Pile/dp/B07NPNN57S'
+    amazon(url, interval);
+}
+
+
+let firstRun = true;
+export default async function amazon(url, interval) {
+    try {
+        const { data } = await axios.get(url, {
+            headers: {
+                'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.90 Safari/537.36'
+            }
+        }).catch(function (error) {
+            console.log(error);
+        });
+        
+        let parser = new DomParser();
+        let doc = parser.parseFromString(data, 'text/html');
+        let title = doc.getElementById('productTitle').innerHTML.trim().slice(0, 150)
+        let inventory = doc.getElementById('add-to-cart-button')
+
+        if (inventory != null) inventory = inventory.getAttribute('value')
+        if (inventory != 'Add to Cart' && firstRun) {
+            console.info(moment().format('LTS') + ': "' + title + '" not in stock at Amazon. Will keep retrying every', interval.value, interval.unit)
+            firstRun = false;
+        }
+        else if (inventory != null && inventory == 'Add to Cart') {
+            threeBeeps();
+            console.info(moment().format('LTS') + ': ***** In Stock at Amazon *****: ', title);
+            console.info(url);
+        }
+    } catch (e) {
+        console.log('Unhandled error. Written to logAmazon.log')
+        fs.writeFile('logAmazon.log', e, function(err, result) {
+            if(err) console.log('File write error: ', err);
+        });
+    }
+};

stores/amazon.js

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+import { fileURLToPath } from "url";
+import fs from 'fs';
+import threeBeeps from "../beep.js"
+import axios from "axios";
+import moment from "moment";
+import DomParser from "dom-parser";     // https://www.npmjs.com/package/dom-parser
+
+
+if (process.argv[1] === fileURLToPath(import.meta.url)) {
+    let interval = {
+        unit: 'seconds',  // seconds, m: minutes, h: hours
+        value: 5
+    }
+    let url = 'https://www.bestbuy.com/site/amd-ryzen-9-5900x-4th-gen-12-core-24-threads-unlocked-desktop-processor-without-cooler/6438942.p?skuId=6438942' 
+    bestbuy(url, interval);
+}
+
+
+let firstRun = true;
+export default async function bestbuy(url, interval) {
+    try {
+        var res = await axios.get(url);
+        if (res.status === 200) {
+            let parser = new DomParser();
+            let doc = parser.parseFromString(res.data, 'text/html');
+            let title = doc.getElementsByClassName('sku-title')[0].childNodes[0].textContent
+            let inventory = doc.getElementsByClassName('btn btn-disabled btn-lg btn-block add-to-cart-button')[0].textContent
+            if (inventory == 'Sold Out' && firstRun) {
+                console.info(moment().format('LTS') + ': "' + title + '" not in stock at BestBuy. Will keep retrying every', interval.value, interval.unit)
+                firstRun = false;
+            }
+            else if (inventory == 'Add to Cart') {
+                threeBeeps();
+                console.info(moment().format('LTS') + ': ***** In Stock at BestBuy *****: ', title);
+                console.info(url);
+            }
+        } else {
+            console.info(moment().format('LTS') + ': Error occured checking ' + title + '. Retrying in', interval.value, interval.unit)
+        }
+
+    } catch (e) {
+        console.log('Unhandled error. Written to logBestbuy.log')
+        fs.writeFile('logBestbuy.log', e, function(err, result) {
+            if(err) console.log('File write error: ', err);
+        });
+    }
+};

stores/bestbuy.js

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+import { fileURLToPath } from "url";
+import fs from "fs";
+import threeBeeps from "../beep.js"
+import axios from "axios";
+import moment from "moment";
+import DomParser from "dom-parser";     // https://www.npmjs.com/package/dom-parser
+
+
+if (process.argv[1] === fileURLToPath(import.meta.url)) {
+    let interval = {
+        unit: 'seconds',  // seconds, m: minutes, h: hours
+        value: 5
+    }
+    let url = 'https://www.costco.com/sony-playstation-5-gaming-console-bundle.product.100691489.html'
+    costco(url, interval);
+}
+
+
+let firstRun = true;
+export default async function costco(url, interval) {
+    try {
+        var res = await axios.get(url);
+        if (res.status === 200) {
+            let parser = new DomParser();
+            let doc = parser.parseFromString(res.data, 'text/html');
+            let title = doc.getElementsByTagName('title')[0].innerHTML
+            let inventory = doc.getElementById('add-to-cart-btn').getAttribute('value')
+
+            if (inventory == 'Out of Stock' && firstRun) {
+                console.info(moment().format('LTS') + ': "' + title + '" not in stock at Costco. Will keep retrying every', interval.value, interval.unit)
+                firstRun = false;
+            }
+            else if (inventory != 'Out of Stock') {
+                threeBeeps();
+                console.info(moment().format('LTS') + ': ***** In Stock at Costco *****: ', title);
+                console.info(url);
+            }
+        } else {
+            console.info(moment().format('LTS') + ': Error occured checking ' + title + '. Retrying in', interval.value, interval.unit)
+        }
+
+    } catch (e) {
+        console.log('Unhandled error. Written to logCostco.log')
+        fs.writeFile('logCostco.log', e, function(err, result) {
+            if(err) console.log('File write error: ', err);
+        });
+    }
+};