dougal-software/lib/www/server/api/middleware/sequence/get/binary.js

const { sequence } = require('../../../../lib/db');
const { MSGTYPE, encode } = require('../../../../lib/binary');

module.exports = async function (req, res, next) {

	try {
		const json = await sequence.get(req.params.project, req.params.sequence, req.query);

		let msgType, geometry, error;
		switch (req.query.geometry) {
			case "F":
			case "FINAL":
				msgType = MSGTYPE.FINAL_OPT;
				geometry = "geometryfinal";
				error = "errorfinal";
				break;
			case "f":
			case "final":
				msgType = MSGTYPE.FINAL;
				geometry = "geometryfinal";
				error = "errorfinal";
				break;
			case "R":
			case "RAW":
				msgType = MSGTYPE.RAW_OPT;
				geometry = "geometryraw";
				error = "errorraw";
				break;
			case "r":
			case "raw":
				msgType = MSGTYPE.RAW;
				geometry = "geometryraw";
				error = "errorraw";
				break;
			case "P":
			case "PREPLOT":
				msgType = MSGTYPE.PREPLOT_RAWERROR_OPT;
				geometry = "geometrypreplot";
				error = ["errorfinal", "errorraw"];
				break;
			case "p":
			case "preplot":
			default:
				msgType = MSGTYPE.PREPLOT;
				geometry = "geometrypreplot";
				break;
		}

		const endianness = req.query.endianness != "big";

		const data = encode(json, geometry, error, msgType, endianness);
		console.log("bundle", data);

		res.status(200).send(Buffer.from(data));
		next();
	} catch (err) {
		next(err);
	}

};