celestial-position-mcp/dist/fetch-catalogs.js

MCP server for celestial object altitude-azimuth coordinates

import * as fs from 'fs';
import * as path from 'path';
import fetch from 'node-fetch';
const DATA_DIR = path.join(__dirname, '../data');
// Catalog URLs - using raw GitHub URLs directly
const CATALOGS = [
    {
        url: 'https://raw.githubusercontent.com/mattiaverga/OpenNGC/master/database_files/NGC.csv',
        destination: 'ngc.csv',
        description: 'OpenNGC Catalog'
    },
    {
        url: 'https://raw.githubusercontent.com/astronexus/HYG-Database/master/hyg/CURRENT/hygdata_v41.csv',
        destination: 'hygdata_v41.csv',
        description: 'HYG Database v41'
    }
];
/**
 * Ensure directory exists
 */
function ensureDirectoryExists(dir) {
    if (!fs.existsSync(dir)) {
        console.log(`Creating directory: ${dir}`);
        fs.mkdirSync(dir, { recursive: true });
    }
}
/**
 * Download a file from URL
 */
async function downloadFile(url, destination) {
    const filePath = path.join(DATA_DIR, destination);
    console.log(`Downloading ${url} to ${filePath}...`);
    try {
        const response = await fetch(url);
        if (!response.ok) {
            throw new Error(`Failed to download ${url}: ${response.statusText}`);
        }
        // Create a write stream to save the file
        const fileStream = fs.createWriteStream(filePath);
        return new Promise((resolve, reject) => {
            // Pipe the response body to the file
            response.body?.pipe(fileStream);
            fileStream.on('finish', () => {
                console.log(`Successfully downloaded ${destination}`);
                resolve();
            });
            fileStream.on('error', (err) => {
                console.error(`Error writing to file: ${err.message}`);
                reject(err);
            });
        });
    }
    catch (error) {
        console.error(`Error downloading file: ${error}`);
        throw error;
    }
}
/**
 * Main function to download all catalogs
 */
async function main() {
    // Ensure data directory exists
    ensureDirectoryExists(DATA_DIR);
    // Try to download each catalog
    for (const catalog of CATALOGS) {
        try {
            await downloadFile(catalog.url, catalog.destination);
        }
        catch (error) {
            console.error(`Failed to download ${catalog.description}: ${error}`);
            console.log('Continuing with next catalog...');
        }
    }
    console.log('\nCatalog download complete!');
    console.log('You can now restart the server to use the downloaded catalogs.');
}
// Run the main function
main();