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docs/BEST_PRACTICES.md
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docs/BEST_PRACTICES.md
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# DBIS Core Banking System - Best Practices Guide
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This document provides comprehensive best practices for developing, deploying, and maintaining the DBIS Core Banking System.
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## Table of Contents
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1. [Code Organization](#code-organization)
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2. [Security Best Practices](#security-best-practices)
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3. [Performance Best Practices](#performance-best-practices)
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4. [Testing Best Practices](#testing-best-practices)
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5. [Documentation Best Practices](#documentation-best-practices)
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6. [Deployment Best Practices](#deployment-best-practices)
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---
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## Code Organization
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### Directory Structure
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```mermaid
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graph TD
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subgraph "Recommended Structure"
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SRC[src/]
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CORE[core/<br/>Business Logic]
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INTEGRATION[integration/<br/>External Interfaces]
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INFRA[infrastructure/<br/>Infrastructure Services]
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SHARED[shared/<br/>Shared Utilities]
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CORE --> SERVICES[services/<br/>Service Layer]
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CORE --> MODELS[models/<br/>Domain Models]
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CORE --> ROUTES[routes/<br/>API Routes]
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INTEGRATION --> API_GW[api-gateway/]
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INTEGRATION --> ISO[iso20022/]
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INTEGRATION --> HSM[hsm/]
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INFRA --> MONITORING[monitoring/]
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INFRA --> ENCRYPTION[encryption/]
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INFRA --> QUANTUM[quantum/]
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SHARED --> UTILS[utils/]
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SHARED --> TYPES[types/]
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SHARED --> CONFIG[config/]
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end
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```
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### Best Practices
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1. **Service Layer Pattern**
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- Keep business logic in service classes
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- Services should be stateless
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- Use dependency injection for testability
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2. **Domain Models**
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- Use Prisma models for database entities
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- Create domain models for business logic
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- Separate data models from domain models
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3. **Error Handling**
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- Use custom error classes
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- Provide meaningful error messages
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- Log errors with context
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4. **Code Reusability**
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- Extract common functionality to shared utilities
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- Use TypeScript interfaces for contracts
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- Avoid code duplication
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---
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## Security Best Practices
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### Authentication & Authorization
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```mermaid
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sequenceDiagram
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participant Client
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participant API as API Gateway
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participant Auth as Auth Service
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participant HSM
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participant Service as Business Service
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Client->>API: Request with JWT
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API->>Auth: Validate JWT
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Auth->>HSM: Verify Signature
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HSM-->>Auth: Signature Valid
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Auth->>Auth: Check Permissions
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Auth-->>API: Authorized
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API->>Service: Process Request
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Service-->>Client: Response
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```
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### Security Guidelines
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**Priority: Critical**
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1. **HSM Integration**
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- Use HSM for all cryptographic operations
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- Never store private keys in code or environment variables
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- Rotate keys regularly
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- Use hardware-backed key storage
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2. **Zero-Trust Authentication**
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- Verify every request
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- Use request signatures
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- Implement token expiration
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- Validate timestamps to prevent replay attacks
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3. **Input Validation**
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- Validate all input data
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- Use Zod for schema validation
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- Sanitize user inputs
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- Reject malformed requests
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4. **Secrets Management**
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- Use environment variables for secrets
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- Never commit secrets to version control
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- Use secret management services (AWS Secrets Manager, HashiCorp Vault)
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- Rotate secrets regularly
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5. **CORS Configuration**
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- Never use wildcards in production
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- Specify exact allowed origins
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- Validate origin headers
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- Use credentials only when necessary
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### Data Protection
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1. **Encryption**
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- Encrypt data in transit (TLS 1.3)
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- Encrypt sensitive data at rest
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- Use strong encryption algorithms
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- Implement key rotation
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2. **Audit Logging**
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- Log all security events
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- Store logs in tamper-proof storage
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- Enable log analysis
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- Retain logs per regulatory requirements
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---
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## Performance Best Practices
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### Database Optimization
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```mermaid
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graph LR
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subgraph "Database Optimization"
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INDEX[Proper Indexing]
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POOL[Connection Pooling]
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QUERY[Query Optimization]
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CACHE[Caching Strategy]
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end
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INDEX --> PERFORMANCE[Improved Performance]
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POOL --> PERFORMANCE
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QUERY --> PERFORMANCE
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CACHE --> PERFORMANCE
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```
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### Performance Guidelines
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**Priority: High**
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1. **Database Connection Management**
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- Use Prisma singleton pattern
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- Configure connection pooling
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- Monitor connection pool metrics
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- Implement connection retry logic
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2. **Query Optimization**
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- Use database indexes
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- Avoid N+1 queries
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- Use select statements to limit fields
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- Implement pagination for large datasets
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3. **Caching Strategy**
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- Cache frequently accessed data
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- Use Redis for distributed caching
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- Implement cache invalidation
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- Set appropriate TTL values
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4. **Async Processing**
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- Use message queues for long-running tasks
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- Process notifications asynchronously
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- Implement background jobs
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- Use worker pools for CPU-intensive tasks
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5. **API Response Optimization**
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- Minimize response payload size
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- Use compression (gzip)
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- Implement response caching
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- Use pagination for list endpoints
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### Monitoring & Profiling
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1. **Performance Metrics**
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- Track API response times
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- Monitor database query times
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- Measure cache hit rates
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- Track error rates
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2. **Profiling**
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- Use APM tools (New Relic, Datadog)
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- Profile slow endpoints
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- Identify bottlenecks
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- Optimize hot paths
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---
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## Testing Best Practices
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### Testing Pyramid
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```mermaid
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graph TD
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subgraph "Testing Pyramid"
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E2E[E2E Tests<br/>Few]
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INT[Integration Tests<br/>Some]
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UNIT[Unit Tests<br/>Many]
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end
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E2E --> INT
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INT --> UNIT
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```
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### Testing Guidelines
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**Priority: High**
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1. **Unit Testing**
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- Test individual functions and methods
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- Use mocks for external dependencies
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- Aim for high code coverage (>80%)
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- Test edge cases and error scenarios
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2. **Integration Testing**
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- Test service interactions
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- Use test database
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- Test API endpoints
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- Validate data flow
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3. **E2E Testing**
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- Test complete user flows
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- Use realistic test data
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- Test critical paths
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- Validate business requirements
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4. **Test Data Management**
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- Use factories for test data
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- Clean up test data after tests
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- Use database transactions for isolation
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- Create reusable test fixtures
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5. **Test Automation**
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- Run tests in CI/CD pipeline
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- Fail builds on test failures
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- Generate coverage reports
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- Run tests on every commit
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### Test Organization
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```mermaid
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graph TD
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TESTS[__tests__/]
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TESTS --> UNIT[unit/<br/>Unit Tests]
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TESTS --> INT[integration/<br/>Integration Tests]
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TESTS --> E2E[e2e/<br/>E2E Tests]
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TESTS --> UTILS[utils/<br/>Test Utilities]
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UNIT --> SERVICES[services/]
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UNIT --> MIDDLEWARE[middleware/]
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INT --> API[api/]
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INT --> DATABASE[database/]
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E2E --> FLOWS[flows/]
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```
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---
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## Documentation Best Practices
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### Documentation Structure
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```mermaid
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graph TD
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DOCS[docs/]
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DOCS --> ARCH[architecture/<br/>Architecture Docs]
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DOCS --> FLOWS[flows/<br/>Flow Documentation]
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DOCS --> API[api/<br/>API Documentation]
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DOCS --> DEPLOY[deployment/<br/>Deployment Guides]
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DOCS --> ADR[adr/<br/>Architecture Decisions]
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ARCH --> DIAGRAMS[diagrams/<br/>Visual Diagrams]
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ARCH --> VOLUMES[volume-*/<br/>Volume Documentation]
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```
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### Documentation Guidelines
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**Priority: Medium**
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1. **Code Documentation**
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- Use JSDoc comments for functions
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- Document complex algorithms
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- Include usage examples
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- Document parameters and return values
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2. **API Documentation**
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- Use OpenAPI/Swagger
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- Document all endpoints
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- Include request/response examples
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- Document error responses
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3. **Architecture Documentation**
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- Document system design decisions
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- Use diagrams (Mermaid, ASCII)
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- Keep documentation up to date
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- Include recommendations
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4. **Flow Documentation**
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- Document all business flows
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- Use sequence diagrams
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- Include error scenarios
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- Document prerequisites
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---
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## Deployment Best Practices
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### Deployment Architecture
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```mermaid
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graph TB
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subgraph "Production Environment"
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LB[Load Balancer]
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subgraph "Application Tier"
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APP1[App Instance 1]
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APP2[App Instance 2]
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APP3[App Instance N]
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end
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subgraph "Database Tier"
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DB_PRIMARY[Primary DB]
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DB_REPLICA1[Replica 1]
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DB_REPLICA2[Replica 2]
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end
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subgraph "Cache Tier"
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CACHE1[Redis 1]
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CACHE2[Redis 2]
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end
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LB --> APP1
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LB --> APP2
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LB --> APP3
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APP1 --> DB_PRIMARY
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APP2 --> DB_PRIMARY
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APP3 --> DB_PRIMARY
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DB_PRIMARY --> DB_REPLICA1
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DB_PRIMARY --> DB_REPLICA2
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APP1 --> CACHE1
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APP2 --> CACHE2
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end
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```
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### Deployment Guidelines
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**Priority: Critical**
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1. **Infrastructure as Code**
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- Use Terraform or CloudFormation
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- Version control infrastructure
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- Automate provisioning
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- Test infrastructure changes
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2. **CI/CD Pipeline**
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- Automate builds and tests
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- Use blue-green deployments
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- Implement rollback procedures
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- Monitor deployment health
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3. **Environment Management**
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- Separate dev, staging, production
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- Use environment-specific configs
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- Never use production data in dev
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- Secure environment variables
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4. **Database Migrations**
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- Version control migrations
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- Test migrations in staging
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- Backup before migrations
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- Plan rollback procedures
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5. **Monitoring & Alerting**
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- Monitor application health
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- Set up alerts for critical issues
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- Track key metrics
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- Use dashboards for visibility
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6. **Disaster Recovery**
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- Implement automated backups
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- Test restore procedures
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- Document recovery plans
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- Maintain RTO/RPO targets
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---
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## Code Quality Standards
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### Code Review Checklist
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- [ ] Code follows style guide
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- [ ] Tests are included and passing
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- [ ] Documentation is updated
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- [ ] Security considerations addressed
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- [ ] Performance implications considered
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- [ ] Error handling is comprehensive
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- [ ] Logging is appropriate
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- [ ] No hardcoded values
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- [ ] Environment variables used correctly
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### Linting & Formatting
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1. **ESLint Configuration**
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- Use TypeScript ESLint rules
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- Enable strict mode
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- Fix linting errors before commit
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2. **Prettier Configuration**
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- Consistent code formatting
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- Auto-format on save
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- Enforce in CI/CD
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3. **Pre-commit Hooks**
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- Run linting
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- Run tests
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- Check formatting
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- Validate commits
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---
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## Summary
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Following these best practices ensures:
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- **Security**: Robust protection against threats
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- **Performance**: Optimal system performance
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- **Maintainability**: Easy to understand and modify
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- **Reliability**: Consistent and predictable behavior
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- **Scalability**: Ability to handle growth
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For specific implementation details, refer to:
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- [Development Guide](./development.md)
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- [Deployment Guide](./deployment.md)
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- [API Guide](./api-guide.md)
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- [Recommendations](./RECOMMENDATIONS.md)
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Reference in New Issue
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