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🔧 AppBackend Server

Application backend services and business logic platform

🎯 Overview

The AppBackend Server is a comprehensive backend service platform that provides business logic, data processing, and application services for the Appgain ecosystem. It handles core application functionality, data management, and service integrations across multiple platforms and applications.

🏗️ Architecture

Core Components

  • Business Logic Engine: Core application logic and workflows
  • Data Processing Layer: Data transformation and processing
  • Service Integration Hub: External service integrations
  • API Gateway: RESTful API endpoints
  • Cache Manager: Redis-based caching system
  • Queue Processor: Background job processing

Technology Stack

  • Backend: Node.js, Express
  • Database: MongoDB, Redis
  • API: RESTful APIs, GraphQL
  • Authentication: JWT, OAuth2
  • Caching: Redis cluster
  • Queue: Bull/BullMQ

Infrastructure

  • Server: ovh-appgain-server
  • Port: 3000 (HTTP), 3001 (HTTPS)
  • Environment: Production, Staging, Development
  • Services: Multiple backend services

🔧 Configuration

Server Details

  • Server: ovh-appgain-server
  • Port: 3000 (HTTP), 3001 (HTTPS)
  • Base URL: https://api.appgain.io
  • Environment: Production, Staging, Development

Backend Configuration

// app-backend.config.js
module.exports = {
  server: {
    port: process.env.PORT || 3000,
    host: process.env.HOST || '0.0.0.0',
    environment: process.env.NODE_ENV || 'development'
  },
  database: {
    mongodb: {
      url: process.env.MONGODB_URL || 'mongodb://localhost:27017/appgain',
      options: {
        useNewUrlParser: true,
        useUnifiedTopology: true,
        maxPoolSize: 10,
        serverSelectionTimeoutMS: 5000
      }
    },
    redis: {
      host: process.env.REDIS_HOST || 'localhost',
      port: process.env.REDIS_PORT || 6379,
      password: process.env.REDIS_PASSWORD,
      db: process.env.REDIS_DB || 0
    }
  },
  authentication: {
    jwt: {
      secret: process.env.JWT_SECRET,
      expiresIn: '24h',
      refreshExpiresIn: '7d'
    },
    oauth: {
      google: {
        clientId: process.env.GOOGLE_CLIENT_ID,
        clientSecret: process.env.GOOGLE_CLIENT_SECRET
      },
      facebook: {
        appId: process.env.FACEBOOK_APP_ID,
        appSecret: process.env.FACEBOOK_APP_SECRET
      }
    }
  },
  services: {
    notify: {
      url: process.env.NOTIFY_SERVICE_URL,
      apiKey: process.env.NOTIFY_API_KEY
    },
    automator: {
      url: process.env.AUTOMATOR_SERVICE_URL,
      apiKey: process.env.AUTOMATOR_API_KEY
    },
    parse: {
      url: process.env.PARSE_SERVER_URL,
      appId: process.env.PARSE_APP_ID,
      masterKey: process.env.PARSE_MASTER_KEY
    }
  },
  cache: {
    ttl: 3600, // 1 hour
    maxSize: 1000,
    checkPeriod: 600
  },
  queue: {
    redis: {
      host: process.env.REDIS_HOST,
      port: process.env.REDIS_PORT,
      password: process.env.REDIS_PASSWORD
    },
    defaultJobOptions: {
      removeOnComplete: 100,
      removeOnFail: 50
    }
  }
}

API Endpoints

# Authentication
POST /api/auth/login
POST /api/auth/register
POST /api/auth/refresh
POST /api/auth/logout

# User Management
GET /api/users
POST /api/users
GET /api/users/{user_id}
PUT /api/users/{user_id}
DELETE /api/users/{user_id}

# Business Logic
GET /api/business/analytics
POST /api/business/process
GET /api/business/reports
POST /api/business/export

# Data Processing
POST /api/data/process
GET /api/data/status/{job_id}
GET /api/data/results/{job_id}

# Service Integration
POST /api/integrations/webhook
GET /api/integrations/status
POST /api/integrations/sync

📊 Service Features

Business Logic Engine

// Business logic operations
businessOperations = {
  'user_analytics': {
    'endpoint': 'GET /api/business/analytics/users',
    'parameters': ['start_date', 'end_date', 'metrics'],
    'response': {
      'total_users': 50000,
      'active_users': 35000,
      'new_users': 2500,
      'churned_users': 150
    }
  },
  'revenue_analytics': {
    'endpoint': 'GET /api/business/analytics/revenue',
    'parameters': ['period', 'group_by'],
    'response': {
      'total_revenue': 150000,
      'mrr': 15000,
      'arr': 180000,
      'growth_rate': 15.5
    }
  },
  'data_processing': {
    'endpoint': 'POST /api/business/process',
    'parameters': ['data_type', 'processing_rules'],
    'response': {
      'job_id': 'job_12345',
      'status': 'processing',
      'estimated_completion': '2024-01-01T12:00:00Z'
    }
  }
}

Data Processing Layer

// Data processing operations
dataProcessing = {
  'batch_processing': {
    'endpoint': 'POST /api/data/batch',
    'capabilities': ['ETL', 'data_cleaning', 'aggregation'],
    'supported_formats': ['CSV', 'JSON', 'XML', 'Excel']
  },
  'real_time_processing': {
    'endpoint': 'POST /api/data/stream',
    'capabilities': ['real_time_analytics', 'event_processing'],
    'latency': '< 100ms'
  },
  'data_export': {
    'endpoint': 'POST /api/data/export',
    'formats': ['CSV', 'JSON', 'PDF', 'Excel'],
    'scheduling': 'immediate|scheduled'
  }
}

Service Integration Hub

// Service integrations
serviceIntegrations = {
  'notify_service': {
    'endpoint': 'POST /api/integrations/notify',
    'capabilities': ['send_notification', 'create_campaign'],
    'channels': ['email', 'sms', 'push', 'whatsapp']
  },
  'automator_engine': {
    'endpoint': 'POST /api/integrations/automator',
    'capabilities': ['create_workflow', 'trigger_action'],
    'workflow_types': ['user_signup', 'purchase', 'abandoned_cart']
  },
  'parse_server': {
    'endpoint': 'POST /api/integrations/parse',
    'capabilities': ['data_sync', 'user_management'],
    'operations': ['create', 'read', 'update', 'delete']
  }
}

🔍 Monitoring & Analytics

Performance Metrics

// Performance monitoring
performanceMetrics = {
  'response_time': {
    'average': 250, // milliseconds
    'p95': 500,
    'p99': 1000
  },
  'throughput': {
    'requests_per_second': 1000,
    'concurrent_users': 500,
    'peak_load': 2000
  },
  'error_rate': {
    'overall': 0.1, // percentage
    'by_endpoint': {
      '/api/auth/login': 0.05,
      '/api/business/analytics': 0.15
    }
  },
  'uptime': {
    'current': 99.9, // percentage
    'monthly': 99.95,
    'yearly': 99.8
  }
}

Business Analytics

// Business analytics data
businessAnalytics = {
  'user_metrics': {
    'total_users': 50000,
    'active_users': 35000,
    'new_users_monthly': 2500,
    'churn_rate': 0.3
  },
  'revenue_metrics': {
    'total_revenue': 150000,
    'mrr': 15000,
    'arr': 180000,
    'ltv': 450,
    'cac': 120
  },
  'performance_metrics': {
    'api_calls': 1000000,
    'data_processed': '500GB',
    'jobs_completed': 50000,
    'average_job_time': 2.5
  }
}

🔒 Security

Authentication & Authorization

  • JWT Tokens: Secure token-based authentication
  • OAuth2 Integration: Social login support
  • Role-Based Access: Granular permissions
  • API Rate Limiting: Request throttling

Data Protection

  • Data Encryption: End-to-end encryption
  • Audit Logging: Complete audit trail
  • GDPR Compliance: Data privacy compliance
  • Backup & Recovery: Automated backup systems

📈 Performance

Capabilities

  • High Throughput: 1000+ requests per second
  • Low Latency: <250ms average response time
  • Scalable: Horizontal scaling support
  • Reliable: 99.9% uptime guarantee

Limitations

  • Rate Limits: 1000 requests per minute per user
  • Data Size: 100MB maximum per request
  • Concurrent Jobs: 100 maximum concurrent jobs
  • Session Timeout: 24 hours session limit

🔗 Integration Examples

Parse Server Integration

// Parse Server integration
parseIntegration = {
  'data_sync': {
    'method': 'POST',
    'endpoint': '/api/integrations/parse/sync',
    'data': {
      'collection': 'users',
      'operation': 'upsert',
      'data': {
        'objectId': 'user123',
        'email': 'user@example.com',
        'name': 'John Doe',
        'updatedAt': '2024-01-01T10:00:00Z'
      }
    }
  },
  'user_management': {
    'method': 'POST',
    'endpoint': '/api/integrations/parse/users',
    'data': {
      'action': 'create',
      'user_data': {
        'username': 'john_doe',
        'email': 'john@example.com',
        'password': 'hashed_password'
      }
    }
  }
}

Notify Service Integration

// Notify Service integration
notifyIntegration = {
  'send_notification': {
    'method': 'POST',
    'endpoint': '/api/integrations/notify/send',
    'data': {
      'channel': 'push',
      'recipients': ['user1', 'user2'],
      'message': {
        'title': 'Backend Notification',
        'body': 'System update completed'
      }
    }
  },
  'create_campaign': {
    'method': 'POST',
    'endpoint': '/api/integrations/notify/campaign',
    'data': {
      'name': 'Backend Campaign',
      'channel': 'email',
      'recipients': ['all_users'],
      'message': {
        'subject': 'System Update',
        'body': 'Important system update notification'
      }
    }
  }
}

Automator Engine Integration

// Automator Engine integration
automatorIntegration = {
  'create_workflow': {
    'method': 'POST',
    'endpoint': '/api/integrations/automator/workflow',
    'data': {
      'name': 'Backend Workflow',
      'trigger': {
        'type': 'data_processed',
        'conditions': []
      },
      'actions': [
        {
          'type': 'send_notification',
          'channel': 'email',
          'template': 'data_processed',
          'data': {}
        }
      ]
    }
  },
  'trigger_action': {
    'method': 'POST',
    'endpoint': '/api/integrations/automator/trigger',
    'data': {
      'workflow_id': 'workflow_123',
      'trigger_data': {
        'user_id': 'user123',
        'event_type': 'data_processed',
        'timestamp': '2024-01-01T10:00:00Z'
      }
    }
  }
}

🛠️ Troubleshooting

Common Issues

API Connection Issues

# Check API health
curl -X GET "https://api.appgain.io/health"

# Check authentication
curl -X POST "https://api.appgain.io/api/auth/login" \
  -H "Content-Type: application/json" \
  -d '{
    "email": "test@example.com",
    "password": "password"
  }'

Database Connection Issues

# Check MongoDB connection
mongo --host localhost --port 27017 appgain --eval "db.stats()"

# Check Redis connection
redis-cli ping

# Check database logs
tail -f /var/log/app-backend/database.log

Service Integration Issues

# Test service integrations
curl -X GET "https://api.appgain.io/api/integrations/status"

# Test specific integration
curl -X POST "https://api.appgain.io/api/integrations/test" \
  -H "Content-Type: application/json" \
  -d '{
    "service": "notify",
    "action": "send_notification",
    "data": {}
  }'

Debug Commands

# Check service logs
tail -f /var/log/app-backend/app.log

# Check performance metrics
curl -X GET "https://api.appgain.io/api/metrics"

# Check queue status
curl -X GET "https://api.appgain.io/api/queue/status"

# Restart service
sudo systemctl restart app-backend

📚 Documentation

External Resources

Monitoring Tools

  • Grafana Dashboards: Real-time metrics
  • Prometheus: Performance monitoring
  • ELK Stack: Log analysis and alerting
  • Custom Analytics: Business metrics tracking

Development Tools

  • Postman Collection: API testing and documentation
  • GitLab Repository: AppGain Backend
  • Development Environment: Docker setup for local testing
  • Testing Framework: Automated API testing
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