231 lines
4.1 KiB
Markdown
231 lines
4.1 KiB
Markdown
# Event-Driven Architecture Design
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**Date**: 2025-01-27
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**Purpose**: Design document for event-driven architecture integration
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**Status**: Design Document
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---
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## Executive Summary
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This document outlines the design for implementing event-driven architecture across the workspace, enabling cross-project communication and real-time updates.
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---
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## Architecture Overview
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### Components
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1. **Event Bus** (NATS, RabbitMQ, or Kafka)
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2. **Event Producers** (Projects publishing events)
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3. **Event Consumers** (Projects subscribing to events)
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4. **Event Schemas** (Shared event definitions)
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5. **Event Monitoring** (Observability and tracking)
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---
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## Technology Options
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### Option 1: NATS (Recommended)
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**Pros**:
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- Lightweight and fast
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- Simple setup
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- Good for microservices
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- Built-in streaming (NATS JetStream)
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**Cons**:
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- Less mature than Kafka
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- Limited enterprise features
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### Option 2: RabbitMQ
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**Pros**:
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- Mature and stable
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- Good management UI
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- Flexible routing
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- Good documentation
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**Cons**:
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- Higher resource usage
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- More complex setup
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### Option 3: Apache Kafka
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**Pros**:
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- High throughput
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- Durable message storage
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- Excellent for event streaming
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- Enterprise features
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**Cons**:
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- Complex setup
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- Higher resource requirements
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- Steeper learning curve
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**Recommendation**: Start with NATS for simplicity, migrate to Kafka if needed for scale.
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---
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## Event Schema Design
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### Event Structure
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```typescript
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interface BaseEvent {
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id: string;
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type: string;
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source: string;
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timestamp: Date;
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version: string;
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data: unknown;
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metadata?: Record<string, unknown>;
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}
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```
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### Event Types
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#### User Events
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- `user.created`
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- `user.updated`
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- `user.deleted`
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- `user.authenticated`
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#### Transaction Events
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- `transaction.created`
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- `transaction.completed`
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- `transaction.failed`
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- `transaction.cancelled`
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#### System Events
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- `system.health.check`
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- `system.maintenance.start`
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- `system.maintenance.end`
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---
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## Implementation Plan
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### Phase 1: Event Bus Setup (Weeks 1-2)
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- [ ] Deploy NATS/RabbitMQ/Kafka
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- [ ] Configure clusters
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- [ ] Set up authentication
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- [ ] Configure monitoring
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### Phase 2: Event Schemas (Weeks 3-4)
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- [ ] Create shared event schemas package
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- [ ] Define event types
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- [ ] Create validation schemas
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- [ ] Document event contracts
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### Phase 3: Producer Implementation (Weeks 5-6)
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- [ ] Implement event producers in projects
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- [ ] Add event publishing utilities
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- [ ] Test event publishing
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- [ ] Monitor event flow
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### Phase 4: Consumer Implementation (Weeks 7-8)
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- [ ] Implement event consumers
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- [ ] Add event handlers
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- [ ] Test event processing
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- [ ] Handle errors and retries
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### Phase 5: Monitoring (Weeks 9-10)
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- [ ] Set up event monitoring
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- [ ] Create dashboards
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- [ ] Set up alerts
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- [ ] Track event metrics
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---
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## Event Patterns
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### Publish-Subscribe
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- Multiple consumers per event
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- Decoupled producers and consumers
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- Use for notifications
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### Request-Reply
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- Synchronous communication
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- Response required
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- Use for RPC-like calls
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### Event Sourcing
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- Store all events
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- Replay events for state
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- Use for audit trails
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---
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## Security
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### Authentication
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- Use TLS for connections
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- Authenticate producers/consumers
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- Use service accounts
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### Authorization
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- Topic-based permissions
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- Limit producer/consumer access
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- Audit event access
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---
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## Monitoring
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### Metrics
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- Event publish rate
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- Event consumption rate
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- Processing latency
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- Error rates
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- Queue depths
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### Alerts
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- High error rate
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- Slow processing
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- Queue buildup
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- Connection failures
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---
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## Best Practices
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### Event Design
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- Keep events small
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- Use versioning
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- Include correlation IDs
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- Make events idempotent
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### Error Handling
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- Retry with backoff
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- Dead letter queues
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- Log all errors
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- Alert on failures
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### Performance
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- Batch events when possible
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- Use compression
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- Monitor throughput
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- Scale horizontally
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---
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## Migration Strategy
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### Gradual Migration
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1. Deploy event bus
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2. Migrate one project as pilot
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3. Add more projects gradually
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4. Monitor and optimize
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### Coexistence
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- Support both sync and async
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- Gradual migration
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- No breaking changes
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- Rollback capability
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---
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**Last Updated**: 2025-01-27
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