main.ts

import { RenderSide, StockStatus, Store } from "./stores/Store.ts";
import { interval, maxLineLength, stores } from "./src/environment.ts";
import { log, logIssue } from "./src/logger.ts";
import { delay } from "./src/utils.ts";

async function loop() {
  while (true) {
    console.log("".padStart(maxLineLength, "="));
    await Promise.all(stores.map(async (s: Store) => await check(s)));
    await delay(interval * 1000);
  }
}

async function check(store: Store) {
  if (store.renderSide === RenderSide.Server) {
    let res: Response;

    try {
      res = await fetch(store.link, {
        headers: {
          "user-agent":
            "Mozilla/5.0 (Macintosh; Intel Mac OS X 11_1_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.150 Safari/537.36",
        },
      });
    } catch (e: any) {
      logIssue(store, e.name || e);
      return;
    }

    if (!res.ok) {
      logIssue(store, `HTTP Error ${res.status}`);
      return;
    }

    const text = await res.text();

    if (
      !!store.matcher?.outOfStock &&
      store.matcher.outOfStock.every((c) => text.includes(c.contains!))
    ) {
      log(StockStatus.OutOfStock, store);
    } else {
      log(StockStatus.InStock, store);
    }
  }
}

await loop();