Simple express server to expose files in local FS

server.js

const express = require('express');
const path = require('path');
const fs = require('fs');
const cors = require('cors');
const util = require('util');
const fspro = require('fs').promises;
const app = express();
const PORT = 3000;

app.use(cors());
app.use(express.static(path.join(__dirname, '.')));

app.get('/api/test', (req, res) => {
    const data = { message: 'Hello from the server!' };
    res.json(data);
});

app.get('/api/dirs', (req, res) => {
    const currentDir = __dirname;

    fs.readdir(currentDir, (err, files) => {
        if (err) {
            console.error('Error reading directory:', err);
            res.status(500).json({ error: 'Internal Server Error' });
            return;
        }

        const dirs = files.filter(file => fs.statSync(path.join(currentDir, file)).isDirectory());
        const data = { dirs: dirs };
        res.json(data);
    });
});

// API endpoint to get an array of JSON stats data from a specific run directory
app.get('/api/stats/:rundir', async (req, res) => {
    try {
        const rundir = req.params.rundir;
        const runStatsFiles = await getRunStatsFiles(rundir);
        const jsonDataArray = await Promise.all(runStatsFiles.map(async (file) => {
            const filePath = path.join(__dirname, rundir, file);
            console.log('filePath=' + filePath)
            const data = await fspro.readFile(filePath, { encoding: 'utf-8' });
            return JSON.parse(data);
        }));

        res.json(jsonDataArray);
    } catch (error) {
        console.error('Error fetching JSON stats data:', error);
        res.status(500).json({ error: 'Internal Server Error' });
    }
});

const readdir = util.promisify(fs.readdir);
async function getRunStatsFiles(rundir) {
    try {
        const dirPath = path.join(__dirname, rundir);
        console.log('dirPath=' + dirPath)

        if (!fs.existsSync(dirPath)) {
            console.error('Run directory does not exist:', dirPath);
            return [];
        }

        const files = await readdir(dirPath);
        const statsFiles = files.filter(file => file.startsWith('run_stats_stage_') && file.endsWith('.json'));

        return statsFiles;
    } catch (error) {
        console.error('Error reading run directory:', error);
        throw error;
    }
}

app.listen(PORT, () => {
    console.log(`Server is running on http://localhost:${PORT}`);
});