add Telegram notification configuration and broadcast functionality

.env.example

@@ -21,3 +21,7 @@ SMB_PASSWORD=your_password
 SMB_DOMAIN=your_domain
 SMB_DOWNLOAD_FILE=ez.bak
 SMB_LOCAL_DOWNLOAD_FILE=ez.bak
+
+# Telegram Notification Configuration
+BASE_URL=https://your-api.example.com
+ADMIN_API_KEY=replace-with-admin-api-key

index.js

@@ -41,12 +41,84 @@ const downloadFile = process.env.SMB_DOWNLOAD_FILE;
 const localDownloadFile = process.env.SMB_LOCAL_DOWNLOAD_FILE;
 
 
+// Admin Telegram Broadcast (env-configured)
+const BASE_URL = process.env.BASE_URL;
+const ADMIN_API_KEY = process.env.ADMIN_API_KEY;
+
+async function sendTelegramBroadcast(target, message) {
+  try {
+    if (!BASE_URL || !ADMIN_API_KEY) {
+      console.warn('Skipping admin broadcast: missing BASE_URL or ADMIN_API_KEY');
+      return null;
+    }
+    const endpoint = `${BASE_URL.replace(/\/$/, '')}/api/admin/telegram/broadcast`;
+    const res = await fetch(endpoint, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+        'X-API-Key': ADMIN_API_KEY,
+      },
+      body: JSON.stringify({ target, message }),
+    });
+    if (!res.ok) {
+      const err = await res.json().catch(() => ({}));
+      throw new Error(`Broadcast failed: ${res.status} ${res.statusText} ${err.error || ''}`);
+    }
+    return res.json();
+  } catch (e) {
+    console.error('Admin broadcast error:', e.message);
+    return null;
+  }
+}
+
+// Helper to format bytes to human-readable
+function formatBytes(bytes) {
+  if (bytes === 0 || bytes == null) return '0 B';
+  const k = 1024;
+  const sizes = ['B', 'KB', 'MB', 'GB', 'TB'];
+  const i = Math.floor(Math.log(bytes) / Math.log(k));
+  const val = bytes / Math.pow(k, i);
+  return `${val.toFixed(val >= 100 ? 0 : val >= 10 ? 1 : 2)} ${sizes[i]}`;
+}
+
+// Query DB sizes (data + log) in bytes
+async function getDbSizeBytes() {
+  try {
+    // Assumes active connection exists
+    const dbName = process.env.MSSQL_DATABASE;
+    const sizeQuery = `
+      ;WITH s AS (
+        SELECT
+          type_desc,
+          size_mb = SUM(size) * 8.0 / 1024.0
+        FROM sys.master_files
+        WHERE database_id = DB_ID(@db)
+        GROUP BY type_desc
+      )
+      SELECT
+        data_bytes = CAST(COALESCE((SELECT size_mb FROM s WHERE type_desc = 'ROWS'), 0) * 1024 * 1024 AS BIGINT),
+        log_bytes  = CAST(COALESCE((SELECT size_mb FROM s WHERE type_desc = 'LOG'), 0) * 1024 * 1024 AS BIGINT);
+    `;
+    const request = new sql.Request();
+    request.input('db', sql.NVarChar, dbName);
+    const r = await request.query(sizeQuery);
+    const row = r.recordset && r.recordset[0];
+    return {
+      dataBytes: row ? Number(row.data_bytes) : null,
+      logBytes: row ? Number(row.log_bytes) : null,
+    };
+  } catch (e) {
+    console.warn('Could not query DB size:', e.message);
+    return { dataBytes: null, logBytes: null };
+  }
+}
+
 // Function to create database backup
 async function createDatabaseBackup() {
   try {
     console.log('Connecting to database...');
     await sql.connect(config);
-    
+
     console.log('Creating database backup...');
     const backupQuery = `
       BACKUP DATABASE [${process.env.MSSQL_DATABASE}] 
@@ -54,15 +126,13 @@ async function createDatabaseBackup() {
       WITH NOFORMAT, NOINIT, NAME = N'${process.env.MSSQL_DATABASE}-Vollständig Datenbank Sichern', 
       SKIP, NOREWIND, NOUNLOAD, STATS = 10
     `;
-    
+
     const result = await sql.query(backupQuery);
     console.log('Database backup created successfully');
     return backupFilePath;
   } catch (err) {
     console.error('Error creating database backup:', err);
     throw err;
-  } finally {
-    await sql.close();
   }
 }
 
@@ -120,20 +190,41 @@ async function uploadBackupToS3(filePath) {
 async function runBackupProcess() {
   try {
     console.log('Starting backup process at', new Date().toISOString());
-    
-    // Create database backup
+
+    // Create database backup (opens connection)
     await createDatabaseBackup();
-    
+
+    // While connected, get DB size info
+    const sizes = await getDbSizeBytes();
+
+    // Close connection once done with SQL-related work
+    await sql.close().catch(() => {});
+
     // Download backup file from SMB share
     const localBackupFile = await downloadBackupFile();
-    
+
     // Upload backup to S3
     const s3Url = await uploadBackupToS3(localBackupFile);
-    
+
     console.log('Backup process completed successfully at', new Date().toISOString());
     console.log('Backup available at:', s3Url);
+
+    // Notify admins via Telegram broadcast with size
+    const fileName = path.basename(localBackupFile || 'backup.bak');
+    const when = new Date().toISOString();
+    const sizeLine = sizes && (sizes.dataBytes != null || sizes.logBytes != null)
+      ? `\nDB Size: ${sizes.dataBytes != null ? formatBytes(sizes.dataBytes) : '?'} (data), ${sizes.logBytes != null ? formatBytes(sizes.logBytes) : '?'} (log)`
+      : '';
+    const msg = `Backup completed ✅\nDB: ${process.env.MSSQL_DATABASE}\nFile: ${fileName}\nS3: ${s3Url}${sizeLine}\nTime: ${when}`;
+    await sendTelegramBroadcast('admins', msg);
   } catch (err) {
     console.error('Backup process failed:', err);
+    // Ensure connection closed on failure
+    try { await sql.close(); } catch {}
+    // Optional: notify error channel on failure (best-effort)
+    const when = new Date().toISOString();
+    const msg = `Backup failed 🔴\nDB: ${process.env.MSSQL_DATABASE}\nTime: ${when}\nError: ${err && err.message ? err.message : err}`;
+    await sendTelegramBroadcast('errors', msg);
   }
 }
 
@@ -145,3 +236,16 @@ runBackupProcess();
 setInterval(runBackupProcess, 86400000);
 
 console.log('Database backup service started. Running backups every 24 hours.');
+
+// Startup health notification
+(async () => {
+  try {
+    const when = new Date().toISOString();
+    const host = require('os').hostname();
+    const region = process.env.AWS_REGION || 'n/a';
+    const bucket = process.env.S3_BUCKET_NAME || 'n/a';
+    await sendTelegramBroadcast('admins', `Backup service started ✅\nDB: ${process.env.MSSQL_DATABASE}\nHost: ${host}\nAWS: ${region}/${bucket}\nTime: ${when}`);
+  } catch (e) {
+    console.warn('Startup broadcast failed:', e.message);
+  }
+})();