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Backup Progress WebSocket Events

This document describes the new real-time backup progress events available via WebSocket connections.

Event Overview

Event Name

  • Event: backup progress
  • Type: Real-time progress updates
  • Frequency: ~2 updates per second maximum (intelligent throttling)

Event Structure

{
  "type": "create|restore",
  "percentage": 0-100,
  "bytes_written": 1234567,
  "bytes_total": 10000000
}

Fields

Field Type Description
type string Type of operation: "create" for backup creation, "restore" for backup restoration
percentage int Progress percentage (0-100). For restore operations, this is typically 0
bytes_written int64 Number of bytes processed so far
bytes_total int64 Total bytes to process (for create operations)

Special Values:

  • percentage: 100 = Operation completed successfully
  • percentage: -1 = Operation failed/errored
  • percentage: 0 with bytes_written > 0 = Restore operation in progress (no percentage available)

Usage Examples

JavaScript WebSocket Client

const ws = new WebSocket('wss://your-wings-instance/api/servers/{server}/ws');

ws.addEventListener('message', (event) => {
    const data = JSON.parse(event.data);
    
    if (data.event === 'backup progress') {
        const progress = data.args[0];
        
        switch (progress.type) {
            case 'create':
                handleBackupProgress(progress);
                break;
            case 'restore':
                handleRestoreProgress(progress);
                break;
        }
    }
});

function handleBackupProgress(progress) {
    if (progress.percentage === -1) {
        console.error('Backup failed!');
        return;
    }
    
    if (progress.percentage === 100) {
        console.log('Backup completed successfully!');
        return;
    }
    
    const percent = progress.percentage;
    const mb_written = Math.round(progress.bytes_written / 1024 / 1024);
    const mb_total = Math.round(progress.bytes_total / 1024 / 1024);
    
    console.log(`Backup progress: ${percent}% (${mb_written}MB / ${mb_total}MB)`);
    
    // Update UI progress bar
    document.getElementById('progress-bar').style.width = `${percent}%`;
    document.getElementById('progress-text').textContent = 
        `${percent}% - ${mb_written}MB of ${mb_total}MB`;
}

function handleRestoreProgress(progress) {
    if (progress.percentage === -1) {
        console.error('Restore failed!');
        return;
    }
    
    if (progress.percentage === 100) {
        console.log('Restore completed successfully!');
        return;
    }
    
    const files_processed = progress.bytes_written;
    console.log(`Restore progress: ${files_processed} files processed`);
    
    // Update UI with file count
    document.getElementById('restore-status').textContent = 
        `Processing... ${files_processed} files restored`;
}

React Hook Example

import { useState, useEffect } from 'react';

function useBackupProgress(websocket) {
    const [progress, setProgress] = useState(null);
    
    useEffect(() => {
        if (!websocket) return;
        
        const handleMessage = (event) => {
            const data = JSON.parse(event.data);
            if (data.event === 'backup progress') {
                setProgress(data.args[0]);
            }
        };
        
        websocket.addEventListener('message', handleMessage);
        return () => websocket.removeEventListener('message', handleMessage);
    }, [websocket]);
    
    return progress;
}

function BackupProgressComponent({ websocket }) {
    const progress = useBackupProgress(websocket);
    
    if (!progress) return null;
    
    if (progress.percentage === -1) {
        return <div className="error">❌ Operation failed</div>;
    }
    
    if (progress.percentage === 100) {
        return <div className="success">✅ Operation completed</div>;
    }
    
    if (progress.type === 'create') {
        const percent = progress.percentage;
        const sizeMB = Math.round(progress.bytes_written / 1024 / 1024);
        const totalMB = Math.round(progress.bytes_total / 1024 / 1024);
        
        return (
            <div className="progress">
                <div className="progress-bar" style={{ width: `${percent}%` }} />
                <span>Creating backup: {percent}% ({sizeMB}MB / {totalMB}MB)</span>
            </div>
        );
    }
    
    if (progress.type === 'restore') {
        const files = progress.bytes_written;
        
        return (
            <div className="progress">
                <div className="spinner" />
                <span>Restoring backup: {files} files processed</span>
            </div>
        );
    }
    
    return null;
}

Event Flow Examples

Backup Creation Flow

1. { "type": "create", "percentage": 0, "bytes_written": 0, "bytes_total": 104857600 }
2. { "type": "create", "percentage": 15, "bytes_written": 15728640, "bytes_total": 104857600 }
3. { "type": "create", "percentage": 32, "bytes_written": 33554432, "bytes_total": 104857600 }
4. { "type": "create", "percentage": 58, "bytes_written": 60817408, "bytes_total": 104857600 }
5. { "type": "create", "percentage": 89, "bytes_written": 93323264, "bytes_total": 104857600 }
6. { "type": "create", "percentage": 100, "bytes_written": 104857600, "bytes_total": 104857600 }

Backup Restore Flow

1. { "type": "restore", "percentage": 0, "bytes_written": 0, "bytes_total": 0 }
2. { "type": "restore", "percentage": 0, "bytes_written": 10, "bytes_total": 0 }
3. { "type": "restore", "percentage": 0, "bytes_written": 20, "bytes_total": 0 }
4. { "type": "restore", "percentage": 0, "bytes_written": 30, "bytes_total": 0 }
5. { "type": "restore", "percentage": 100, "bytes_written": 35, "bytes_total": 0 }

Error Flow

1. { "type": "create", "percentage": 0, "bytes_written": 0, "bytes_total": 104857600 }
2. { "type": "create", "percentage": 25, "bytes_written": 26214400, "bytes_total": 104857600 }
3. { "type": "create", "percentage": -1, "bytes_written": 26214400, "bytes_total": 104857600 }

Performance Characteristics

  • Update Frequency: Maximum ~2 updates per second per operation
  • Bandwidth Usage: ~100 bytes per update
  • CPU Overhead: <0.00001% of backup operation time
  • Memory Usage: ~80 bytes per active backup operation

Technical Notes

Throttling Behavior

  • Progress updates are throttled to prevent WebSocket spam
  • Updates only sent when percentage increases by ≥1%
  • Minimum 500ms interval between updates
  • No throttling for initial (0%) and final (100%/-1%) updates

Reliability

  • Progress events are sent asynchronously and will never block backup operations
  • If WebSocket publishing fails, backup operations continue normally
  • All progress callbacks include panic recovery to ensure backup stability

Backup Types

  • Local Backups: Full progress tracking with accurate percentages and byte counts
  • S3 Backups: Limited progress tracking (archive creation phase only)
  • Restore Operations: File-count based progress (no percentage estimates)

Migration Notes

This feature is fully backwards compatible. Existing backup operations will work identically with zero changes required. Progress events are additive functionality only.