Implement comprehensive microservices infrastructure

[Cybermaxi7]

Comprehensive Microservices Infrastructure Implementation

Summary

This PR implements a complete microservices infrastructure for the Quest Service project, addressing four major issues:

• Implement Monitoring and Logging Infrastructure #257: Monitoring and Logging Infrastructure
• Implement Game Session Service #258: Game Session Service
• Implement Economy Service #259: Economy Service
• Implement Schema Design and Shared Database Strategy #261: Schema Design and Shared Database Strategy

🚀 Features Implemented

Monitoring & Logging Infrastructure (#257)

• ELK Stack: Centralized logging with Elasticsearch, Logstash, and Kibana
• Prometheus: Metrics collection with custom NestJS metrics module
• Grafana: Visualization dashboards for system monitoring
• Jaeger: Distributed tracing for microservices
• AlertManager: Alerting system with comprehensive rules
• Structured Logging: JSON-based logging with trace context
• Runbooks: Operational documentation for common issues

Game Session Service (#258)

• Session Management: Complete lifecycle management with Redis caching
• State Snapshots: Incremental and full snapshot system
• Replay System: Game recording and playback functionality
• Timeout Handling: Automated session cleanup and timeout management
• REST API: Comprehensive endpoints for session operations

Economy Service (#259)

• Energy System: Regeneration mechanics and management
• Transaction Management: Multi-currency transaction processing
• Shop System: Item management and purchase workflows
• Payment Processing: Integration with Stripe, PayPal, and Coinbase
• Scheduled Tasks: Energy regeneration with cron jobs

Database Strategy (#261)

• Database-per-Service: Proper isolation with dedicated databases
• Docker Configuration: Complete setup for all databases and replicas
• Security: User management with proper access controls
• Performance: Indexing strategies and monitoring
• Backup & Recovery: Automated backup systems with disaster recovery

📁 Files Added/Modified

Monitoring Infrastructure

docker-compose.monitoring.yml
monitoring/
├── alertmanager/alertmanager.yml
├── grafana/
│   ├── provisioning/datasources/prometheus.yml
│   ├── provisioning/dashboards/dashboard.yml
│   └── dashboards/quest-service-overview.json
├── logstash/
│   ├── config/logstash.yml
│   └── pipeline/logstash.conf
├── prometheus/
│   ├── prometheus.yml
│   └── rules/alerts.yml
└── runbooks/README.md

Main Service Enhancements

src/common/
├── logging/structured-logger.interceptor.ts
└── metrics/
    ├── metrics.module.ts
    ├── metrics.service.ts
    └── metrics.interceptor.ts
src/app.module.ts (updated)
src/main.ts (updated)
package.json (updated)

Game Session Service

microservices/game-session-service/src/services/
├── session-timeout.service.ts (new)
├── session.service.ts (existing, enhanced)
├── state-snapshot.service.ts (existing, enhanced)
└── replay.service.ts (existing, enhanced)

Economy Service

microservices/economy-service/src/
├── energy/ (existing, enhanced)
├── transaction/ (existing, enhanced)
├── shop/ (existing, enhanced)
└── payment/ (existing, enhanced)

Database Strategy

microservices/
├── database-strategy.md (new)
├── docker-compose.databases.yml (new)
└── database/init-databases.sh (new)

🔧 Technical Details

Monitoring Stack

• Elasticsearch: 8.15.0 with single-node configuration
• Logstash: 8.15.0 with JSON parsing pipeline
• Kibana: 8.15.0 with Elasticsearch integration
• Prometheus: v2.53.0 with custom metrics
• Grafana: 11.1.0 with pre-configured dashboards
• Jaeger: 1.54 for distributed tracing

Database Architecture

• PostgreSQL: 15-alpine for all services
• Redis: 7-alpine for caching and session management
• Read Replicas: Configured for high-traffic services
• Connection Pooling: Optimized for each service

Security Features

• SSL/TLS: Encrypted database connections
• User Isolation: Service-specific database users
• Access Controls: Row-level security where applicable
• Secrets Management: Environment-based configuration

📊 Performance Improvements

Database Optimization

• Indexing Strategy: Comprehensive indexes for common query patterns
• Connection Pooling: Optimized pool sizes per service
• Read Replicas: Load balancing for read operations
• Query Optimization: Efficient queries with proper joins

Caching Strategy

• Redis Integration: Session caching and state management
• TTL Management: Automatic cache expiration
• Memory Optimization: Efficient data structures

Monitoring & Alerting

• Real-time Metrics: HTTP request tracking, response times
• Resource Monitoring: CPU, memory, disk usage
• Business Metrics: Game sessions, transactions, user activity
• Alert Rules: Comprehensive alerting for system health

🚀 Deployment Instructions

Prerequisites

# Install dependencies
npm install

# Start monitoring infrastructure
docker-compose -f docker-compose.monitoring.yml up -d

# Start databases
docker-compose -f microservices/docker-compose.databases.yml up -d

# Initialize databases
chmod +x microservices/database/init-databases.sh
./microservices/database/init-databases.sh

Service Startup

# Start main quest service
npm run start:dev

# Start game session service
cd microservices/game-session-service
npm run start:dev

# Start economy service
cd ../economy-service
npm run start:dev

Monitoring Access

• Grafana: http://localhost:3003 (admin/admin123)
• Kibana: http://localhost:5601
• Prometheus: http://localhost:9090
• Jaeger: http://localhost:16686
• AlertManager: http://localhost:9093

🧪 Testing

Unit Tests

# Run tests for main service
npm run test

# Run tests for microservices
cd microservices/game-session-service && npm run test
cd ../economy-service && npm run test

Integration Tests

# Test database connectivity
npm run test:e2e

# Test monitoring endpoints
curl http://localhost:3000/metrics
curl http://localhost:3000/health

📈 Monitoring & Observability

Key Metrics

• HTTP Requests: Request rate, response times, error rates
• Database: Connection usage, query performance, replication lag
• Business Metrics: Active sessions, transaction volume, user engagement
• System Resources: CPU, memory, disk usage, network I/O

Alerting Rules

• Critical: Service down, database failures, high error rates
• Warning: High response times, resource usage, backup failures
• Info: Deployments, configuration changes

🔍 Troubleshooting

Common Issues

1. Database Connection: Check connection strings and user permissions
2. Redis Connection: Verify Redis is running and accessible
3. Monitoring: Check Docker containers are healthy
4. Service Health: Review logs and metrics in Grafana

Debug Commands

# Check service logs
docker logs quest-service
docker logs quest_postgres_main

# Check monitoring status
docker ps | grep -E "(prometheus|grafana|elasticsearch)"

# Test database connectivity
pg_isready -h localhost -p 5432 -U postgres

📚 Documentation

• Runbooks: monitoring/runbooks/README.md
• Database Strategy: microservices/database-strategy.md
• API Documentation: Available via Swagger endpoints
• Architecture: See individual service documentation

🔄 Migration Notes

From Previous Setup

1. Database Migration: Run initialization scripts for new databases
2. Configuration: Update environment variables for new services
3. Monitoring: Update Prometheus targets for new services
4. Dependencies: Install new npm packages for monitoring

Breaking Changes

• Database URLs: Updated to use dedicated databases
• Configuration: New environment variables required
• Dependencies: Additional monitoring packages added

✅ Acceptance Criteria

All acceptance criteria from the original issues have been met:

#257 - Monitoring & Logging ✅

• Centralized logging with ELK stack
• Structured logging format
• Prometheus metrics collection
• Grafana dashboards
• Distributed tracing with Jaeger
• Alerting rules configuration
• Comprehensive runbooks

#258 - Game Session Service ✅

• Session management with Redis caching
• State snapshot system
• Replay functionality
• Session timeout handling
• REST API endpoints
• Performance optimization

#259 - Economy Service ✅

• Energy system with regeneration
• Transaction management
• Shop system implementation
• Payment processing integration
• Scheduled task management

#261 - Database Strategy ✅

• Database-per-service architecture
• Comprehensive Docker configuration
• Security best practices
• Performance optimization
• Backup and recovery procedures

📝 Next Steps

1. Review: Code review and testing
2. Deploy: Staging environment deployment
3. Monitor: Verify all monitoring endpoints
4. Document: Update API documentation
5. Train: Team training on new infrastructure

👥 Contributors

• Implementation: Complete microservices infrastructure
• Testing: Comprehensive test coverage
• Documentation: Detailed operational guides
• Security: Security best practices implementation

---

closes #257
closes #258
closes #259
closes #261

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