# System Patterns: SkyFi MCP
## System Architecture
### Architecture Pattern
**Microservices Architecture** for modularity and scalability
### Communication Patterns
- **Primary**: RESTful APIs with stateless HTTP
- **Real-time**: Server-Sent Events (SSE) for live updates
- **State Management**: Stateless design with external state storage
- **Deployment**: Containerized (Docker) for portability
### High-Level Architecture
```
┌─────────────────┐
│ AI Agents │
│ (ADK/LangChain)│
└────────┬────────┘
│
│ HTTP + SSE
│
┌────────▼─────────────────┐
│ SkyFi MCP Server │
│ ┌────────────────────┐ │
│ │ Authentication │ │
│ │ Order Management │ │
│ │ Data Search │ │
│ │ Monitoring │ │
│ │ Pricing Engine │ │
│ └────────────────────┘ │
└────────┬─────────────────┘
│
│ API Calls
│
┌────────▼─────────────┐
│ SkyFi Public API │
└──────────────────────┘
│
┌────────▼─────────────┐
│ OpenStreetMaps API │
└──────────────────────┘
```
## Key Technical Decisions
### 1. Stateless Design
- **Decision**: Stateless HTTP + SSE communication
- **Rationale**: Enables horizontal scaling, simplifies deployment
- **Implementation**: All state stored externally (database, cache)
### 2. Dual Deployment Model
- **Decision**: Support both local and remote server hosting
- **Rationale**: Flexibility for different use cases (development vs. production)
- **Implementation**: Docker containers for consistent deployment
### 3. Framework Integration
- **Decision**: Native support for ADK, LangChain, AI SDK
- **Rationale**: Cover majority of AI developer preferences
- **Implementation**: Framework-specific SDKs and examples
### 4. OpenStreetMaps Integration
- **Decision**: Integrate OpenStreetMaps for geospatial context
- **Rationale**: Provides rich geospatial visualization and context
- **Implementation**: API integration with caching strategy
## Design Patterns
### 1. API Gateway Pattern
- Central entry point for all requests
- Handles authentication, rate limiting, routing
- Provides consistent interface to clients
### 2. Service Layer Pattern
- Business logic separated from API layer
- Reusable services for order management, search, monitoring
- Easier testing and maintenance
### 3. Repository Pattern
- Data access abstraction
- Enables switching data sources
- Simplifies testing with mock repositories
### 4. Observer Pattern
- Webhook notifications for monitoring updates
- Event-driven architecture for real-time updates
- Decoupled notification system
### 5. Strategy Pattern
- Different pricing strategies
- Multiple authentication methods
- Pluggable framework integrations
## Component Relationships
### Core Components
#### Authentication Service
- **Purpose**: Manages API keys, OAuth flows, user sessions
- **Dependencies**: Credential storage, SkyFi API
- **Exports**: Authentication tokens, user context
#### Order Management System
- **Purpose**: Handles order placement, tracking, history
- **Dependencies**: SkyFi API, Pricing Engine, Authentication
- **Exports**: Order status, confirmations, history
#### Data Search Service
- **Purpose**: Enables iterative data discovery and exploration
- **Dependencies**: SkyFi API, OpenStreetMaps, Search History
- **Exports**: Search results, metadata, recommendations
#### Monitoring Service
- **Purpose**: Manages AOI monitoring and notifications
- **Dependencies**: SkyFi API, Webhook Service, Notification Service
- **Exports**: Monitoring status, alerts, updates
#### Pricing Engine
- **Purpose**: Calculates pricing, estimates costs, checks feasibility
- **Dependencies**: SkyFi API, Order Management
- **Exports**: Price estimates, feasibility reports
#### Notification Service
- **Purpose**: Sends webhook notifications for events
- **Dependencies**: Monitoring Service, Webhook endpoints
- **Exports**: Event notifications, delivery status
## Data Flow Patterns
### Order Placement Flow
```
Client Request → Authentication → Feasibility Check → Price Calculation
→ Confirmation → Order Placement → Status Updates → Completion
```
### Data Search Flow
```
Search Query → Query Parsing → SkyFi API Call → Result Processing
→ Metadata Enrichment → OpenStreetMaps Context → Response
```
### Monitoring Flow
```
AOI Definition → Validation → SkyFi API Registration → Webhook Setup
→ Active Monitoring → Event Detection → Notification → Status Update
```
## Integration Patterns
### Framework Integration
- **ADK**: Native SDK with type definitions
- **LangChain**: Custom tools and agents
- **AI SDK**: Plugin architecture
### External API Integration
- **SkyFi API**: Primary data source, synchronous calls
- **OpenStreetMaps**: Geospatial context, cached responses
- **Webhooks**: Asynchronous event delivery
## Security Patterns
### Authentication
- API key management with rotation support
- OAuth 2.0 for enterprise customers
- Secure credential storage (encrypted)
### Authorization
- Role-based access control (RBAC)
- Resource-level permissions
- Multi-tenant isolation
### Data Protection
- TLS 1.3 for all communications
- Encryption at rest for credentials
- Audit logging for security events
## Scalability Patterns
### Horizontal Scaling
- Stateless services enable easy scaling
- Load balancing across instances
- Auto-scaling based on metrics
### Caching Strategy
- Frequently accessed data cached
- OpenStreetMaps responses cached
- Search results cached with TTL
### Database Patterns
- Connection pooling
- Read replicas for scaling reads
- Sharding strategy for large datasets
## Error Handling Patterns
### Error Response Format
```json
{
"error": {
"code": "ERROR_CODE",
"message": "Human-readable message",
"details": {},
"timestamp": "ISO-8601"
}
}
```
### Error Categories
- **Authentication Errors**: 401 Unauthorized
- **Validation Errors**: 400 Bad Request
- **Not Found Errors**: 404 Not Found
- **Rate Limit Errors**: 429 Too Many Requests
- **Server Errors**: 500 Internal Server Error
### Retry Strategy
- Exponential backoff for transient errors
- Maximum retry attempts
- Circuit breaker pattern for external APIs
## Testing Patterns
### Unit Testing
- Service layer components
- Business logic validation
- Error handling scenarios
### Integration Testing
- API endpoint testing
- External API mocking
- End-to-end workflows
### Performance Testing
- Load testing for concurrent requests
- Response time validation
- Stress testing for peak loads
---
**Last Updated**: January 2025
