@fdm-monster/server/dist/utils/gcode.utils.js

FDM Monster is a bulk OctoPrint, Klipper, PrusaLink and BambuLab manager to set up, configure and monitor 3D printers. Our aim is to provide neat overview over your farm.

import { open } from "node:fs/promises";
//#region src/utils/gcode.utils.ts
const gcodeScanningChunkSize = 64 * 1024;
/**
* Read local GCode metadata or thumbnails
* @param filePath
* @param numberOfLines
*/
async function readLastLinesLocal(filePath, numberOfLines) {
	const file = await open(filePath, "r");
	try {
		const buffer = Buffer.alloc(gcodeScanningChunkSize);
		const fileSize = await file.stat();
		let lines = [];
		let position = fileSize.size;
		let iterationsLeft = 100;
		while (lines.length <= numberOfLines && position > 0) {
			iterationsLeft--;
			if (iterationsLeft <= 0) throw new Error("Too many iterations reached, 'readLastLines' aborted");
			const bytesToRead = Math.min(gcodeScanningChunkSize, position);
			position -= bytesToRead;
			await file.read(buffer, 0, bytesToRead, position);
			lines = buffer.toString("utf-8", 0, bytesToRead).split("\n").concat(lines);
			await file.close();
		}
		return lines.slice(-numberOfLines);
	} catch (e) {
		await file.close();
		throw e;
	}
}
//#endregion
export { gcodeScanningChunkSize, readLastLinesLocal };

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