1.0.0

src/schedule/schedule.service.ts

@@ -0,0 +1,43 @@
+import { Injectable } from "@nestjs/common";
+import {
+	ScheduleParser,
+	ScheduleParseResult,
+} from "./internal/schedule-parser/schedule-parser";
+import { BasicXlsDownloader } from "./internal/xls-downloader/basic-xls-downloader";
+import { XlsDownloaderCacheMode } from "./internal/xls-downloader/xls-downloader.base";
+import { ScheduleDto } from "../dto/schedule.dto";
+
+@Injectable()
+export class ScheduleService {
+	private readonly scheduleParser = new ScheduleParser(
+		new BasicXlsDownloader(
+			"https://politehnikum-eng.ru/index/raspisanie_zanjatij/0-409",
+			XlsDownloaderCacheMode.SOFT,
+		),
+		"ИС-214/23",
+	);
+
+	private lastCacheUpdate: Date = new Date(0);
+	private lastChangedDays: Array<number> = [];
+
+	constructor() {}
+
+	async getSchedule(): Promise<ScheduleDto> {
+		const now = new Date();
+		const cacheExpired =
+			(this.lastCacheUpdate.valueOf() - now.valueOf()) / 1000 / 60 > 5;
+
+		if (cacheExpired) this.lastCacheUpdate = now;
+
+		const schedule = await this.scheduleParser.getSchedule(!cacheExpired);
+		if (schedule.affectedDays.length !== 0)
+			this.lastChangedDays = schedule.affectedDays;
+
+		return {
+			updatedAt: this.lastCacheUpdate,
+			data: schedule.group,
+			etag: schedule.etag,
+			lastChangedDays: this.lastChangedDays,
+		};
+	}
+}