262 lines
9.2 KiB
TypeScript
262 lines
9.2 KiB
TypeScript
/**
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* T&S Communication Scraper — Chinese compatible transceiver manufacturer
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*
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* www.china-tscom.com — product catalog with USD prices.
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* Paginated: /products/fiber-optic-transceivers/?page=N
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*
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* Rate limited: 1 req/2sec.
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*/
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import { pool, findOrCreateScrapedTransceiver, ensureVendor, upsertPriceObservation } from "../utils/db";
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import { contentHash } from "../utils/hash";
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import * as cheerio from "cheerio";
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const BASE = "https://www.china-tscom.com";
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const CATALOG_PATH = "/products/fiber-optic-transceivers/";
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const MAX_PAGES = 15;
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const HEADERS = {
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"User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36",
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Accept: "text/html,application/xhtml+xml",
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"Accept-Language": "en-US,en;q=0.9",
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};
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interface Product {
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partNumber: string;
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name: string;
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url: string;
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price?: number;
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formFactor: string;
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speed: string;
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speedGbps: number;
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reachLabel?: string;
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reachMeters?: number;
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fiberType?: string;
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wavelength?: string;
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}
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function sleep(ms: number): Promise<void> {
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return new Promise((resolve) => setTimeout(resolve, ms));
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}
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function detectFormFactor(text: string): { formFactor: string; speed: string; speedGbps: number } {
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const lower = text.toLowerCase();
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if (lower.includes("osfp") && !lower.includes("qsfp")) return { formFactor: "OSFP", speed: "400G", speedGbps: 400 };
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if (lower.includes("qsfp-dd")) return { formFactor: "QSFP-DD", speed: "400G", speedGbps: 400 };
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if (lower.includes("qsfp28")) return { formFactor: "QSFP28", speed: "100G", speedGbps: 100 };
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if (lower.includes("qsfp+") || lower.includes("qsfp plus")) return { formFactor: "QSFP+", speed: "40G", speedGbps: 40 };
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if (lower.includes("sfp56")) return { formFactor: "SFP56", speed: "50G", speedGbps: 50 };
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if (lower.includes("sfp28") || lower.includes("25g")) return { formFactor: "SFP28", speed: "25G", speedGbps: 25 };
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if (lower.includes("sfp+") || lower.includes("10gbase") || lower.includes("10g")) return { formFactor: "SFP+", speed: "10G", speedGbps: 10 };
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if (lower.includes("xfp")) return { formFactor: "XFP", speed: "10G", speedGbps: 10 };
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if (lower.includes("1000base") || lower.includes("1g")) return { formFactor: "SFP", speed: "1G", speedGbps: 1 };
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if (lower.includes("sfp") && !lower.includes("qsfp")) return { formFactor: "SFP", speed: "1G", speedGbps: 1 };
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return { formFactor: "SFP+", speed: "10G", speedGbps: 10 };
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}
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function detectReach(text: string): { label: string; meters: number } | undefined {
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const patterns: [RegExp, string, number][] = [
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[/\b80\s*km\b/i, "80km", 80000],
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[/\b40\s*km\b/i, "40km", 40000],
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[/\b20\s*km\b/i, "20km", 20000],
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[/\b10\s*km\b/i, "10km", 10000],
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[/\b2\s*km\b/i, "2km", 2000],
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[/\b550\s*m\b/i, "550m", 550],
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[/\b300\s*m\b/i, "300m", 300],
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[/\b100\s*m\b/i, "100m", 100],
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[/\bLR4\b/, "10km", 10000], [/\bLR\b/, "10km", 10000],
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[/\bER4?\b/, "40km", 40000], [/\bZR4?\b/, "80km", 80000],
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[/\bSR4?\b/, "300m", 300], [/\bDR4?\b/, "500m", 500], [/\bFR4?\b/, "2km", 2000],
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];
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for (const [regex, label, meters] of patterns) {
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if (regex.test(text)) return { label, meters };
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}
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return undefined;
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}
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function detectFiber(text: string): string {
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if (/single.?mode|smf|[^a-z]lx[^a-z]|[^a-z]lr[^a-z]|[^a-z]er[^a-z]|[^a-z]zr[^a-z]|bidi|cwdm|dwdm/i.test(text)) return "SMF";
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if (/multi.?mode|mmf|[^a-z]sx[^a-z]|[^a-z]sr[^a-z]/i.test(text)) return "MMF";
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if (/copper|dac|twinax|rj45|base-t/i.test(text)) return "Copper";
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return "SMF";
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}
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function detectWavelength(text: string): string {
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const match = text.match(/(\d{3,4})\s*nm/i);
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return match ? match[1] : "";
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}
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function parseProductList(html: string): Product[] {
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const $ = cheerio.load(html);
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const products: Product[] = [];
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// Try common product grid/list selectors
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const cardSelectors = [
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".product-item", ".product-card", ".item", "li.product",
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"article", ".product", ".col-product", ".entry",
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];
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let found = false;
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for (const sel of cardSelectors) {
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if ($(sel).length >= 2) {
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$(sel).each((_i, el) => {
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const nameEl = $(el).find("h2, h3, h4, .product-name, .entry-title, a").first();
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const name = nameEl.text().trim();
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if (!name || name.length < 5 || !/sfp|qsfp|xfp|transceiver|optic/i.test(name)) return;
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const linkEl = $(el).find("a[href]").first();
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const href = linkEl.attr("href") || "";
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const url = href.startsWith("http") ? href : BASE + href;
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// USD price patterns
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const priceText = $(el).find(".price, .product-price, .amount, [data-price]").text();
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const priceMatch = priceText.match(/\$\s*([\d,]+\.?\d{0,2})/) ||
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priceText.match(/([\d,]+\.?\d{0,2})\s*USD/i);
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let price: number | undefined;
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if (priceMatch) {
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const parsed = parseFloat(priceMatch[1].replace(",", ""));
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if (parsed > 0 && parsed < 50000) price = parsed;
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}
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const skuText = $(el).find(".sku, [data-sku], .model, .part-number").text().trim();
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const partNumber = skuText ||
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name.match(/[A-Z0-9][-A-Z0-9]{5,}/)?.[0] ||
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name.replace(/\s+/g, "-").slice(0, 60);
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const ff = detectFormFactor(name);
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const reach = detectReach(name);
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products.push({
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partNumber,
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name,
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url,
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price,
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...ff,
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reachLabel: reach?.label,
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reachMeters: reach?.meters,
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fiberType: detectFiber(name),
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wavelength: detectWavelength(name),
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});
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});
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if (products.length > 0) { found = true; break; }
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}
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}
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// Fallback: anchor-based extraction
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if (!found) {
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$("a[href]").each((_i, el) => {
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const name = $(el).text().trim();
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const href = $(el).attr("href") || "";
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if (name.length < 8 || name.length > 200 || !/sfp|qsfp|transceiver/i.test(name)) return;
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const url = href.startsWith("http") ? href : BASE + href;
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const ff = detectFormFactor(name);
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const reach = detectReach(name);
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products.push({
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partNumber: name.match(/[A-Z0-9][-A-Z0-9]{5,}/)?.[0] || name.replace(/\s+/g, "-").slice(0, 60),
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name, url, ...ff,
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reachLabel: reach?.label, reachMeters: reach?.meters,
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fiberType: detectFiber(name), wavelength: detectWavelength(name),
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});
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});
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}
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const seen = new Set<string>();
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return products.filter((p) => {
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if (!p.url || seen.has(p.url)) return false;
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seen.add(p.url);
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return true;
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});
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}
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async function fetchPage(url: string): Promise<string> {
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const resp = await fetch(url, { headers: HEADERS, signal: AbortSignal.timeout(30000) });
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if (!resp.ok) throw new Error(`HTTP ${resp.status} for ${url}`);
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return resp.text();
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}
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export async function scrapeTsCom(): Promise<void> {
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console.log("=== T&S Communication Scraper Starting ===\n");
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const vendorId = await ensureVendor(
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"T&S Communication",
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"compatible",
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"https://www.china-tscom.com",
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BASE + CATALOG_PATH,
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);
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let allProducts: Product[] = [];
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for (let page = 1; page <= MAX_PAGES; page++) {
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try {
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const url = page === 1
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? BASE + CATALOG_PATH
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: `${BASE}${CATALOG_PATH}?page=${page}`;
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const html = await fetchPage(url);
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const pageProducts = parseProductList(html);
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allProducts.push(...pageProducts);
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console.log(` Page ${page}: ${pageProducts.length} products`);
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if (pageProducts.length === 0) {
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console.log(` Empty page ${page}, stopping pagination.`);
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break;
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}
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if (page < MAX_PAGES) await sleep(2000);
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} catch (err) {
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console.warn(` Page ${page} failed: ${(err as Error).message}`);
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break;
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}
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}
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const seen = new Set<string>();
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allProducts = allProducts.filter((p) => {
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if (seen.has(p.url)) return false;
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seen.add(p.url);
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return true;
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});
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console.log(`\nTotal unique products: ${allProducts.length}`);
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let totalProducts = 0;
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let priceUpdates = 0;
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for (const product of allProducts) {
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try {
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const txId = await findOrCreateScrapedTransceiver({
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partNumber: product.partNumber,
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vendorId,
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productUrl: product.url,
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formFactor: product.formFactor,
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speedGbps: product.speedGbps,
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speed: product.speed,
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reachMeters: product.reachMeters,
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reachLabel: product.reachLabel,
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fiberType: product.fiberType,
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wavelengths: product.wavelength,
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category: "DataCenter",
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});
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if (product.price && product.price > 0) {
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const hash = contentHash({ price: product.price, part: product.partNumber });
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const updated = await upsertPriceObservation({
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transceiverId: txId,
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sourceVendorId: vendorId,
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price: product.price,
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currency: "USD",
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stockLevel: "in_stock",
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url: product.url,
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contentHash: hash,
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});
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if (updated) priceUpdates++;
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}
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totalProducts++;
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} catch (err) {
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console.warn(` Error saving ${product.partNumber}: ${(err as Error).message.slice(0, 80)}`);
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}
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}
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console.log(`\n=== T&S Communication Complete: ${totalProducts} products, ${priceUpdates} prices ===`);
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}
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if (require.main === module) {
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scrapeTsCom()
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.then(() => pool.end())
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.catch((err) => { console.error("Fatal:", err); pool.end(); process.exit(1); });
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}
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