From 02c00f717e0d30480e15e09e3aec802dcfc3da17 Mon Sep 17 00:00:00 2001 From: aitbc Date: Sat, 9 May 2026 12:36:46 +0200 Subject: [PATCH] docs: add microservices architecture evaluation - Evaluate current AITBC monolithic architecture - Assess service independence, data ownership, deployment independence - Analyze scaling requirements and team size - Compare microservices pros and cons - Recommend remaining monolithic with modular architecture - Propose modular monolith as alternative approach - Define migration path if microservices needed later - Document evaluation criteria and decision rationale --- docs/MICROSERVICES_ARCHITECTURE_EVALUATION.md | 197 ++++++++++++++++++ 1 file changed, 197 insertions(+) create mode 100644 docs/MICROSERVICES_ARCHITECTURE_EVALUATION.md diff --git a/docs/MICROSERVICES_ARCHITECTURE_EVALUATION.md b/docs/MICROSERVICES_ARCHITECTURE_EVALUATION.md new file mode 100644 index 00000000..fd55117f --- /dev/null +++ b/docs/MICROSERVICES_ARCHITECTURE_EVALUATION.md @@ -0,0 +1,197 @@ +# Microservices Architecture Evaluation + +**Date:** 2026-05-09 +**Purpose:** Evaluate whether AITBC should evolve toward a microservices architecture + +--- + +## Current Architecture Assessment + +### Current State +AITBC currently uses a **monolithic architecture** with the following characteristics: + +**Components:** +- Blockchain node (single service) +- Agent daemon (single service) +- API gateway (single service) +- Wallet service (single service) +- Marketplace service (single service) +- Monitoring service (single service) + +**Data Layer:** +- SQLite databases per service +- Redis for caching +- S3 for object storage + +**Communication:** +- HTTP/REST APIs +- Event bus for async communication +- Direct blockchain RPC calls + +--- + +## Evaluation Criteria + +### 1. Service Independence +**Current Status:** Partial +- Services share some code (aitbc package) +- Some services have tight coupling (wallet + blockchain) +- Event bus provides some decoupling + +**Assessment:** Medium service independence. Some refactoring needed for full independence. + +### 2. Data Ownership +**Current Status:** Shared +- Each service has its own SQLite database +- Some cross-service data access required +- No clear data ownership boundaries + +**Assessment:** Data ownership is not clearly defined. This would be a major challenge for microservices. + +### 3. Deployment Independence +**Current Status:** Low +- Services deployed together in most environments +- Shared infrastructure dependencies +- Coordinated deployments required + +**Assessment:** Low deployment independence. Significant infrastructure changes needed. + +### 4. Scaling Requirements +**Current Status:** Low +- Most services are not horizontally scalable +- Blockchain node has specific scaling needs +- Current load does not require independent scaling + +**Assessment:** Scaling requirements are minimal. Microservices would add complexity without clear benefit. + +### 5. Team Size +**Current Status:** Small team +- Development team is small +- Clear ownership of components +- Communication overhead is low + +**Assessment:** Small team size doesn't justify microservices complexity. Monolith is more suitable. + +### 6. Technology Diversity +**Current Status:** Low +- All services use Python +- Shared libraries and dependencies +- Consistent tech stack + +**Assessment:** Low technology diversity. No need for microservices to enable different tech stacks. + +--- + +## Microservices Pros/Cons + +### Pros +1. **Independent Scaling:** Each service can scale independently +2. **Fault Isolation:** Failure in one service doesn't affect others +3. **Technology Flexibility:** Different services can use different technologies +4. **Faster Development:** Smaller teams can work independently +5. **Easier Deployment:** Deploy individual services without full redeploy + +### Cons +1. **Increased Complexity:** More moving parts to manage +2. **Network Latency:** Inter-service communication adds latency +3. **Data Consistency:** Distributed transactions are complex +4. **Operational Overhead:** More infrastructure to monitor and maintain +5. **Testing Complexity:** Integration testing becomes harder + +--- + +## Recommendation + +### **Recommendation: Remain Monolithic with Modular Architecture** + +**Rationale:** +1. **Team Size:** Small development team doesn't benefit from microservices complexity +2. **Scaling Needs:** Current load doesn't require independent scaling +3. **Data Complexity:** Shared data access patterns make microservices difficult +4. **Operational Overhead:** Current team lacks DevOps capacity for microservices +5. **Maturity:** Monolith is more mature and stable + +### **Alternative: Modular Monolith** + +Instead of full microservices, implement a **modular monolith**: + +**Benefits:** +- Clear module boundaries (similar to microservices) +- Single deployment unit (simpler operations) +- Shared database (avoid distributed transactions) +- Easier to evolve to microservices if needed later + +**Implementation:** +1. Define clear module boundaries based on domain +2. Implement service layer for each module +3. Use event bus for inter-module communication +4. Maintain shared database with clear ownership +5. Implement feature flags for gradual feature rollout + +--- + +## Migration Path (If Microservices Needed Later) + +If future requirements dictate microservices architecture, follow this path: + +### Phase 1: Modularization (Current) +- Define clear module boundaries +- Implement service layers +- Add feature flags +- Improve monitoring + +### Phase 2: Database Separation +- Identify data ownership per module +- Implement database per service +- Add data migration scripts +- Implement API-based data access + +### Phase 3: Service Extraction +- Extract one service at a time +- Start with low-risk services (monitoring) +- Use feature flags for gradual rollout +- Maintain dual-write during migration + +### Phase 4: Full Microservices +- Complete service extraction +- Implement service mesh (if needed) +- Add distributed tracing +- Implement circuit breakers + +--- + +## Conclusion + +**AITBC should remain a monolithic application with modular architecture.** + +The current architecture is appropriate for the team size, scaling requirements, and operational capacity. Implementing a modular monolith provides most microservices benefits without the complexity overhead. + +Revisit this evaluation when: +- Team size grows beyond 10 developers +- Independent scaling becomes necessary +- Different technology stacks are required +- Service failure isolation becomes critical + +--- + +## Next Steps + +1. **Implement Modular Monolith** + - Continue current modularization efforts + - Define clear module boundaries + - Implement service layers + +2. **Improve Monitoring** + - Add distributed tracing (completed) + - Improve metrics collection + - Add alerting + +3. **Enhance Deployment** + - Implement blue-green deployments (completed) + - Add feature flags (completed) + - Improve rollback capabilities + +4. **Prepare for Future** + - Document module boundaries + - Identify data ownership + - Plan for potential future migration