const fs = require('fs');

const path = require('path');

const moment = require('moment'); // For timestamping backup files

/**

* Backs up log files to a specified directory.

* @param {string} logDirectory - The directory containing the log files.

* @param {string} backupDirectory - The directory to store the backups.

* @param {number} backupRetentionDays - The number of days to keep backups.

*/

function backupLogs(logDirectory, backupDirectory, backupRetentionDays) {

// Ensure backup directory exists

if (!fs.existsSync(backupDirectory)) {

fs.mkdirSync(backupDirectory);

}

const now = moment();

const cutoffDate = now.subtract(backupRetentionDays, 'days').toDate();

// Read files in the log directory

fs.readdir(logDirectory, (err, files) => {

if (err) {

console.error('Error reading log directory:', err);

return;

}

files.forEach(file => {

const filePath = path.join(logDirectory, file);

//Check if it's a file (not a directory)

fs.stat(filePath, (err, stats) => {

if (err) {

console.error('Error getting file stats:', err);

return;

}

if (stats.isFile()) {

// Generate backup filename with timestamp

const timestamp = moment().format('YYYYMMDDHHmmss');

const backupFileName = `backup_${file}_${timestamp}`;

const backupFilePath = path.join(backupDirectory, backupFileName);

try {

// Copy the file to the backup directory

fs.copyFileSync(filePath, backupFilePath);

console.log(`Backed up ${file} to ${backupFilePath}`);

// Optionally, delete backups older than the retention period

const lastModified = stats.mtime;

if (lastModified < cutoffDate) {

fs.unlinkSync(backupFilePath);

console.log(`Deleted old backup ${backupFilePath}`);

}

} catch (copyErr) {

console.error(`Error backing up ${file}:`, copyErr);

}

}

});

});

});

}

// Example Usage (replace with your actual directories and retention period)

const logDirectory = '/path/to/your/logs'; // Replace with your log directory

const backupDirectory = '/path/to/your/backups'; // Replace with your backup directory

const backupRetentionDays = 7; // Keep backups for 7 days

backupLogs(logDirectory, backupDirectory, backupRetentionDays);