119 lines
2.6 KiB
JavaScript
Executable file
119 lines
2.6 KiB
JavaScript
Executable file
const path = "./csv";
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const data = {};
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const column = {};
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let files = [];
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const fs = require("fs");
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const papa = require("papaparse");
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const chokidar = require("chokidar");
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chokidar.watch(path).on("all", () => {
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console.log("File changed. Reloading ...");
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files = fs.readdirSync(`${path}`).filter((file) => file.endsWith(".csv"));
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for (const file of files) {
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const csv = fs.readFileSync(`${path}/${file}`, {
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encoding: "utf8",
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});
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const parsed = papa.parse(csv, {
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skipEmptyLines: true,
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}).data;
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const header = parsed[0];
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column[file] = [];
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for (const h of header) {
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column[file].push({
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key: h,
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text: h,
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sorting: "",
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});
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}
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const converted = [];
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for (let j = 1; j < parsed.length; ++j) {
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const d = parsed[j];
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const e = {};
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for (let i = 0; i < d.length; ++i) {
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e[header[i]] = d[i];
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}
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converted.push(e);
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}
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data[file] = converted;
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}
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});
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const express = require("express");
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const app = express();
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const cors = require("cors");
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app.use(cors());
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const port = 3000;
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app.get("/files", (_, res) => {
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res.send(files);
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});
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function compare(a, b) {
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const m = a - b;
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if (isNaN(m)) {
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if (a > b) {
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return 1;
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}
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if (a < b) {
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return -1;
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}
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return 0;
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}
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return m;
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}
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app.get("/csv/:file", (req, res) => {
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const {
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file
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} = req.params;
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const raw = data[file];
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const col = column[file];
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let processed = raw;
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let query_key = "";
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let key = "";
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const c = col.find((ele) => {
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key = ele.key;
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query_key = `sort_${key}`;
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return query_key in req.query;
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});
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if (!(c === "undefined")) {
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processed = [...raw];
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if (req.query[query_key] == "ASC") {
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processed.sort((a, b) => compare(a[key], b[key]));
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} else {
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processed.sort((a, b) => compare(b[key], a[key]));
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}
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}
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if ("pSize" in req.query && "cPage" in req.query) {
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const size = req.query.pSize;
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const page = req.query.cPage;
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processed = processed.slice((page - 1) * size, page * size);
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}
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res.send({
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totals: raw.length,
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data: processed,
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});
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});
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app.use(express.static("public"));
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app.get("/column/:file", (req, res) => {
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const {
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file
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} = req.params;
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res.send(column[file]);
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});
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app.listen(port, () => {
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console.log(`Listening at http://localhost:${port}`);
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});
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