# Service Discovery

## Overview
The Service Discovery component will provide dynamic registration, discovery, and health monitoring of services within the stock-bot platform. It will enable services to locate and communicate with each other without hardcoded endpoints, supporting a flexible and resilient microservices architecture.

## Planned Features

### Service Registration
- **Automatic Registration**: Self-registration of services on startup
- **Metadata Management**: Service capabilities and endpoint information
- **Instance Tracking**: Multiple instances of the same service
- **Version Information**: Service version and compatibility data
- **Registration Expiry**: TTL-based registration with renewal

### Service Discovery
- **Name-based Lookup**: Find services by logical names
- **Filtering**: Discovery based on metadata and attributes
- **Load Balancing**: Client or server-side load balancing
- **Caching**: Client-side caching of service information
- **DNS Integration**: Optional DNS-based discovery

### Health Monitoring
- **Health Checks**: Customizable health check protocols
- **Automatic Deregistration**: Removal of unhealthy instances
- **Status Propagation**: Health status notifications
- **Dependency Health**: Cascading health status for dependencies
- **Self-healing**: Automatic recovery procedures

### Configuration Management
- **Dynamic Configuration**: Runtime configuration updates
- **Environment-specific Settings**: Configuration by environment
- **Configuration Versioning**: History and rollback capabilities
- **Secret Management**: Secure handling of sensitive configuration
- **Configuration Change Events**: Notifications of config changes

## Planned Integration Points

### Service Integration
- All platform microservices
- External service dependencies
- Infrastructure components
- Monitoring systems

## Planned Technical Implementation

### Technology Stack
- **Service Registry**: Consul, etcd, or ZooKeeper
- **Client Libraries**: TypeScript SDK for services
- **Health Check**: HTTP, TCP, and custom health checks
- **Configuration Store**: Distributed key-value store
- **Load Balancer**: Client-side or service mesh integration

### Architecture Pattern
- Service registry pattern
- Client-side discovery pattern
- Health check pattern
- Circuit breaker integration

## Development Guidelines

### Service Integration
- Registration process
- Discovery implementation
- Health check implementation
- Configuration consumption

### Resilience Practices
- Caching strategy
- Fallback mechanisms
- Retry configuration
- Circuit breaker settings

### Operational Considerations
- High availability setup
- Disaster recovery approach
- Scaling guidelines
- Monitoring requirements

## Implementation Roadmap
1. Core service registry implementation
2. Basic health checking
3. Service discovery integration
4. Configuration management
5. Advanced health monitoring with dependency tracking