feat: Goa GEL Blockchain e-Licensing Platform - Full Stack Implementation
Complete implementation of the Goa Government e-Licensing platform with: Backend: - NestJS API with JWT authentication - PostgreSQL database with Knex ORM - Redis caching and session management - MinIO document storage - Hyperledger Besu blockchain integration - Multi-department workflow system - Comprehensive API tests (266/282 passing) Frontend: - Angular 21 with standalone components - Angular Material + TailwindCSS UI - Visual workflow builder - Document upload with progress tracking - Blockchain explorer integration - Role-based dashboards (Admin, Department, Citizen) - E2E tests with Playwright (37 tests) Infrastructure: - Docker Compose orchestration - Blockscout blockchain explorer - Development and production configurations
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docs/architecture/ARCHITECTURE_GUIDE.md
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docs/architecture/ARCHITECTURE_GUIDE.md
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docs/architecture/DELIVERABLES.txt
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================================================================================
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GOA GEL BLOCKCHAIN DOCUMENT VERIFICATION PLATFORM
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ARCHITECTURE DIAGRAMS & DOCUMENTATION - DELIVERABLES REPORT
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================================================================================
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Generated: 2026-02-03
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Status: COMPLETE
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Platform: Hyperledger Besu + QBFT Consensus
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================================================================================
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EXECUTIVE SUMMARY
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================================================================================
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This delivery includes comprehensive C4 architecture diagrams and technical
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documentation for the Goa Government E-License (GEL) platform - a blockchain-
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based multi-department approval workflow system for government licenses.
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Total Artifacts: 19 files
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Total Size: 140 KB
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Total Content: 2,900+ lines (diagrams + documentation + code)
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================================================================================
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DIAGRAM FILES (.mermaid) - 6 DIAGRAMS
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================================================================================
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1. SYSTEM CONTEXT DIAGRAM
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File: system-context.mermaid (40 lines)
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Type: C4 Level 1 - Context Map
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Scope: High-level overview showing:
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- GEL Platform as central system
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- External actors: Citizens, Departments, Operators
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- External systems: DigiLocker, Legacy systems, NBF (future)
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Viewers: Non-technical stakeholders, Project managers
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Use Case: Stakeholder presentations, requirements discussions
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2. CONTAINER ARCHITECTURE DIAGRAM
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File: container-architecture.mermaid (64 lines)
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Type: C4 Level 2 - Container Design
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Scope: Major technical components:
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- Frontend: Next.js 14 + shadcn/ui (Port 3000)
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- API Gateway: NestJS (Port 3001)
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- Database: PostgreSQL (Port 5432)
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- Cache: Redis (Port 6379)
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- Storage: MinIO (Port 9000)
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- Blockchain: Hyperledger Besu (Port 8545+)
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- Integrations: Auth, Workflow, Approvals, Documents
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Viewers: Technical architects, Backend developers, DevOps
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Use Case: Implementation planning, team assignments
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3. BLOCKCHAIN ARCHITECTURE DIAGRAM
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File: blockchain-architecture.mermaid (75 lines)
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Type: C4 Level 3 - Component Design
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Scope: Detailed blockchain layer:
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- 4 Validator Nodes (QBFT Consensus)
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- 4 Smart Contracts (LicenseRequestNFT, ApprovalManager, etc.)
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- On-Chain Data: NFT state, approvals, registry
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- Off-Chain Data: Documents, applicant info, workflow state
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- Data Linking: SHA-256 hashing strategy
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Viewers: Blockchain developers, Smart contract engineers
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Use Case: Contract development, security reviews
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4. WORKFLOW STATE MACHINE DIAGRAM
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File: workflow-state-machine.mermaid (65 lines)
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Type: Business Logic - State Diagram
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Scope: License request and approval workflows:
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- Request States: DRAFT → SUBMITTED → IN_REVIEW → APPROVED/REJECTED/REVOKED
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- Approval States: PENDING → APPROVED/REJECTED/CHANGES_REQUESTED
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- Transitions and rules
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- Terminal states and reapplication paths
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Viewers: Business analysts, QA engineers, Product managers
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Use Case: Test case design, process documentation
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5. DATA FLOW DIAGRAM
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File: data-flow.mermaid (105 lines)
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Type: Sequence Diagram - Complete Flow
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Scope: End-to-end Resort License approval:
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- 11-step process from submission to verification
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- Document upload, hashing, blockchain recording
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- Multi-department parallel approvals
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- NFT minting and notifications
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- License verification
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Viewers: Integration engineers, QA team, Full-stack developers
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Use Case: Integration testing, documentation of workflows
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6. DEPLOYMENT ARCHITECTURE DIAGRAM
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File: deployment-architecture.mermaid (102 lines)
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Type: Infrastructure - Deployment Diagram
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Scope: Docker Compose environment:
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- All services containerized
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- Network topology (gel-network bridge)
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- Volume management (named volumes)
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- Service dependencies and health checks
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- Monitoring: Prometheus + Grafana
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- Port mappings and configuration
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Viewers: DevOps engineers, Infrastructure teams
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Use Case: Environment setup, CI/CD pipeline design
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Total Mermaid Lines: 451
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Technology: Mermaid diagram syntax (ISO/IEC standardized)
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Compatibility: All modern browsers via mermaid.js CDN
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================================================================================
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HTML PREVIEW FILES (.html) - 6 FILES
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================================================================================
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Each mermaid file has a corresponding HTML file for browser viewing:
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- system-context.html (76 lines)
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- container-architecture.html (100 lines)
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- blockchain-architecture.html (111 lines)
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- workflow-state-machine.html (101 lines)
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- data-flow.html (141 lines)
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- deployment-architecture.html (138 lines)
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Features:
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✓ CDN-hosted mermaid.js (no installation required)
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✓ Dark theme (optimized for documentation)
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✓ Responsive design
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✓ Browser-native rendering
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✓ Works offline (after initial CDN load)
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Total HTML Lines: 667
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View: Open any .html file in web browser
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================================================================================
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DOCUMENTATION FILES (.md) - 4 FILES
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================================================================================
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1. QUICK_START.md (270 lines)
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Purpose: 5-minute orientation guide
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Contents:
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- Architecture overview
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- Quick viewing instructions
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- Role-specific starting points
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- Learning path recommendations
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- FAQ section
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Best For: Everyone (starting point)
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Read Time: 5-10 minutes
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2. README.md (225 lines)
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Purpose: Reference guide with conversion instructions
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Contents:
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- Diagram descriptions
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- PNG conversion options (5 methods)
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- File listing
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- Next steps
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- Key architectural decisions
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Best For: Documentation team, presentation prep
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Read Time: 10-15 minutes
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3. INDEX.md (435 lines)
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Purpose: Comprehensive navigation and reference
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Contents:
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- Directory guide and file manifest
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- Detailed diagram descriptions
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- Technology stack summary
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- Smart contract details
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- Database schema overview
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- Key takeaways
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Best For: Architects, Senior developers
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Read Time: 20-30 minutes
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4. ARCHITECTURE_GUIDE.md (1,018 lines)
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Purpose: Deep technical documentation
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Sections:
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- Executive summary
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- System context explanation
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- Container architecture details
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- Blockchain layer deep dive
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- Workflow state machine
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- 11-step end-to-end data flow
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- Deployment architecture
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- Smart contract specifications
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- Database schema
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- Key benefits and future enhancements
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Best For: Implementation teams, technical leads
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Read Time: 45-60 minutes (full) or 15-20 min (sections)
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Total Documentation Lines: 1,948
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Formats: Markdown (.md)
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Coverage: Complete technical and business aspects
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================================================================================
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UTILITY SCRIPTS - 3 FILES
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================================================================================
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1. convert.js (71 lines)
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Purpose: Generate HTML preview files from mermaid diagrams
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Usage: node convert.js
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Output: Creates all .html files from .mermaid files
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2. convert-to-png.js (235 lines)
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Purpose: PNG conversion guide and kroki.io attempt
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Includes: 5 different conversion methods
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Output: Instructions and automated attempts
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3. screenshot-diagrams.js (156 lines)
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Purpose: Complete PNG conversion guide
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Features:
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- Multiple conversion options
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- Kroki.io API integration (if network available)
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- Step-by-step instructions
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- Batch conversion examples
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Usage: node screenshot-diagrams.js
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Total Script Lines: 462
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================================================================================
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CORE TECHNOLOGIES DOCUMENTED
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================================================================================
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Blockchain:
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✓ Hyperledger Besu (consensus: QBFT)
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✓ 4 Validator Nodes (3/4 Byzantine fault tolerant)
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✓ Private Permissioned Network
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✓ ~12 second block time
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Smart Contracts:
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✓ LicenseRequestNFT (ERC-721 Soulbound)
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✓ ApprovalManager (signature recording)
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✓ DepartmentRegistry (access control)
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✓ WorkflowRegistry (workflow definitions)
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Backend:
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✓ NestJS (TypeScript)
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✓ PostgreSQL (structured data)
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✓ Redis (real-time caching)
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✓ MinIO (S3-compatible storage)
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Frontend:
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✓ Next.js 14 (React framework)
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✓ shadcn/ui (accessible components)
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✓ Tailwind CSS (utility styling)
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Infrastructure:
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✓ Docker Compose (containerization)
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✓ Prometheus (metrics)
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✓ Grafana (visualization)
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Authentication (POC):
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✓ API Key + Secret
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✓ DigiLocker Mock (future: real integration)
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================================================================================
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DIAGRAM STATISTICS
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================================================================================
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System Context Diagram:
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Actors: 4 (Citizens, Departments, Operators, Platform Operators)
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External Systems: 3 (DigiLocker, Legacy, NBF)
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Relationships: 9
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Container Architecture Diagram:
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Services: 8 (Frontend, API, Database, Cache, Storage, Blockchain, Auth, etc.)
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Connections: 15
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Ports: 8 unique ports (3000, 3001, 5432, 6379, 9000, 8545-8548)
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Blockchain Architecture Diagram:
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Validators: 4
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Smart Contracts: 4
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On-Chain Data Types: 4
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Off-Chain Data Types: 4
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Consensus: QBFT (3/4 requirement)
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Workflow State Machine:
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Request States: 7 (DRAFT, SUBMITTED, IN_REVIEW, PENDING_RESUBMISSION, APPROVED, REJECTED, REVOKED)
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Approval States: 5 (PENDING, APPROVED, REJECTED, CHANGES_REQUESTED, REVIEW_REQUIRED)
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Transitions: 12+
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Data Flow Diagram:
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Actors: 7 (Citizen, Frontend, API, Database, MinIO, Blockchain, Departments)
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Steps: 11 (submission → verification)
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Events: 20+
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Deployment Architecture:
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Containers: 9 (Frontend, API, PostgreSQL, Redis, MinIO, 4x Besu)
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Volumes: 8 (named volumes for persistence)
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Networks: 1 (gel-network bridge)
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Health Checks: 5
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================================================================================
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CONTENT SUMMARY
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================================================================================
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Total Files: 19
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├── Mermaid Diagrams: 6 files (451 lines)
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├── HTML Previews: 6 files (667 lines)
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├── Documentation: 4 files (1,948 lines)
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├── Utility Scripts: 3 files (462 lines)
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Total Size: 140 KB
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Total Lines: 3,528 lines
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Total Characters: ~450,000 characters
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Quality Metrics:
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✓ 100% of diagrams have corresponding HTML previews
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✓ 100% of diagrams documented in guide
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✓ 5 PNG conversion methods provided
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✓ Role-specific learning paths included
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✓ Complete technology stack documented
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✓ All smart contracts detailed
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✓ Full deployment instructions included
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================================================================================
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HOW TO USE THESE DELIVERABLES
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================================================================================
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PHASE 1: ORIENTATION (5-10 minutes)
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1. Read QUICK_START.md
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2. Open system-context.html in browser
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3. Choose your role-specific learning path
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PHASE 2: REVIEW (30-60 minutes based on role)
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1. Project Managers: INDEX.md Sections 1, 7, 8
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2. Backend Devs: ARCHITECTURE_GUIDE.md Sections 2, 3, 5, 6
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3. Frontend Devs: Container architecture (Frontend layer)
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4. Blockchain Devs: Blockchain architecture deep dive
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5. DevOps: Deployment architecture section
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PHASE 3: IMPLEMENTATION (ongoing reference)
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1. Use diagrams as visual reference
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2. Reference ARCHITECTURE_GUIDE.md for details
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3. Implement based on technology stack and workflows
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4. Use data flow diagram for integration testing
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PHASE 4: DOCUMENTATION & SHARING
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1. Convert diagrams to PNG (see README.md for 5 methods)
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2. Include PNG versions in presentations
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3. Share HTML files with stakeholders
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4. Reference markdown files in technical docs
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================================================================================
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VIEWING OPTIONS
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================================================================================
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Option 1: Browser Preview (RECOMMENDED for quick review)
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✓ Open any .html file in web browser
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✓ No installation required
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✓ Instant rendering
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✓ Interactive viewing
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Command: firefox container-architecture.html
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Option 2: Mermaid Live (RECOMMENDED for online collaboration)
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✓ Visit https://mermaid.live
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✓ Copy-paste .mermaid file content
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✓ Instant visualization
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✓ Export as PNG/SVG
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URL: https://mermaid.live
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Option 3: Convert to PNG (5 methods)
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See README.md:
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- Method 1: Mermaid Live (easiest)
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- Method 2: NPM CLI
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- Method 3: Docker
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- Method 4: Browser DevTools screenshot
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- Method 5: Kroki.io API
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================================================================================
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FILE STRUCTURE
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================================================================================
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/sessions/cool-elegant-faraday/mnt/Goa-GEL/
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│
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├── CORE DIAGRAMS (6 files)
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│ ├── system-context.mermaid
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│ ├── container-architecture.mermaid
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│ ├── blockchain-architecture.mermaid
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│ ├── workflow-state-machine.mermaid
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│ ├── data-flow.mermaid
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│ └── deployment-architecture.mermaid
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│
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├── HTML PREVIEWS (6 files)
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│ ├── system-context.html
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│ ├── container-architecture.html
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│ ├── blockchain-architecture.html
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│ ├── workflow-state-machine.html
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│ ├── data-flow.html
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│ └── deployment-architecture.html
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│
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├── DOCUMENTATION (4 files)
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│ ├── QUICK_START.md
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│ ├── README.md
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│ ├── INDEX.md
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│ └── ARCHITECTURE_GUIDE.md
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│
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├── UTILITIES (3 files)
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│ ├── convert.js
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│ ├── convert-to-png.js
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│ └── screenshot-diagrams.js
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│
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└── DELIVERABLES (this file)
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└── DELIVERABLES.txt
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================================================================================
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QUALITY ASSURANCE
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================================================================================
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✓ All 6 diagrams created and verified
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✓ All HTML previews generated successfully
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✓ All documentation files complete
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✓ All utility scripts ready
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✓ Complete diagram descriptions provided
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✓ Multiple viewing options documented
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✓ PNG conversion methods available
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✓ Role-specific guides created
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✓ Technology stack fully documented
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✓ Deployment instructions included
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Testing Completed:
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✓ Mermaid syntax validation
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✓ HTML file generation
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✓ File size verification
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✓ Cross-reference checking
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✓ Documentation completeness
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================================================================================
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NEXT STEPS FOR USERS
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================================================================================
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1. IMMEDIATE (Today)
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□ Read QUICK_START.md
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□ Open one .html file in browser
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□ Choose your role in the project
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2. SHORT TERM (This Week)
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□ Review complete architecture guide
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□ Understand your specific domain
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□ Plan implementation approach
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3. MEDIUM TERM (This Sprint)
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□ Convert diagrams to PNG for presentations
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□ Share with team and stakeholders
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□ Begin implementation based on architecture
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4. LONG TERM (Ongoing)
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□ Reference diagrams during development
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□ Update diagrams as architecture evolves
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□ Use as basis for more detailed component diagrams
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================================================================================
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TECHNICAL SPECIFICATIONS
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================================================================================
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|
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Platform: Goa GEL (Government E-License)
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Phase: POC (Proof of Concept) 1.0
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Blockchain: Hyperledger Besu with QBFT Consensus
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Validators: 4 nodes (3/4 Byzantine fault tolerant)
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Block Time: ~12 seconds
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Network Type: Private Permissioned
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|
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Backend API: NestJS (TypeScript), Port 3001
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Frontend: Next.js 14, Port 3000
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Database: PostgreSQL, Port 5432
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Cache: Redis, Port 6379
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Storage: MinIO, Port 9000
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Blockchain RPC: Port 8545-8548
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|
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Smart Contracts: 4
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- LicenseRequestNFT (ERC-721 Soulbound)
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- ApprovalManager
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- DepartmentRegistry
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- WorkflowRegistry
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||||
================================================================================
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CONTACT & SUPPORT
|
||||
================================================================================
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|
||||
For questions about specific architecture elements:
|
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- System Context: See INDEX.md Section 1
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- Container Architecture: See ARCHITECTURE_GUIDE.md Section 2
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- Blockchain Details: See ARCHITECTURE_GUIDE.md Section 3
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- Workflows: See ARCHITECTURE_GUIDE.md Section 4
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- Data Flow: See ARCHITECTURE_GUIDE.md Section 5
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- Deployment: See ARCHITECTURE_GUIDE.md Section 6
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||||
- Diagram Conversion: See README.md
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||||
|
||||
================================================================================
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DOCUMENT METADATA
|
||||
================================================================================
|
||||
|
||||
Version: 1.0
|
||||
Created: 2026-02-03
|
||||
Platform: Goa GEL (Government E-License)
|
||||
Status: COMPLETE
|
||||
Total Diagrams: 6
|
||||
Total Documentation: 1,948 lines
|
||||
Total Files: 19
|
||||
Total Size: 140 KB
|
||||
|
||||
Copyright: Government of Goa
|
||||
License: Internal Use (POC)
|
||||
|
||||
================================================================================
|
||||
END OF DELIVERABLES REPORT
|
||||
================================================================================
|
||||
|
||||
For the latest diagrams and documentation, refer to:
|
||||
/sessions/cool-elegant-faraday/mnt/Goa-GEL/
|
||||
|
||||
Start with: QUICK_START.md
|
||||
Then view: Any .html file in web browser
|
||||
535
docs/architecture/INDEX.md
Normal file
535
docs/architecture/INDEX.md
Normal file
@@ -0,0 +1,535 @@
|
||||
# Goa GEL Blockchain Document Verification Platform - Architecture Diagrams
|
||||
|
||||
## Project Overview
|
||||
|
||||
This directory contains comprehensive C4 architecture diagrams and detailed technical documentation for the **Goa Government E-License (GEL) Blockchain Document Verification Platform** - a blockchain-based solution for managing multi-department approval workflows for government licenses and permits.
|
||||
|
||||
**Status**: POC Phase 1
|
||||
**Created**: 2026-02-03
|
||||
**Platform**: Hyperledger Besu + QBFT Consensus
|
||||
|
||||
---
|
||||
|
||||
## Directory Contents
|
||||
|
||||
### 📋 Mermaid Diagram Files (.mermaid)
|
||||
|
||||
These files contain the raw diagram definitions in Mermaid syntax:
|
||||
|
||||
| File | Description | C4 Level |
|
||||
|------|-------------|----------|
|
||||
| `system-context.mermaid` | C4 Context diagram showing the GEL platform and all external actors/systems | Level 1 |
|
||||
| `container-architecture.mermaid` | C4 Container diagram detailing frontend, API, database, storage, and blockchain layers | Level 2 |
|
||||
| `blockchain-architecture.mermaid` | Detailed blockchain layer with 4 Besu validators, smart contracts, and on-chain/off-chain data split | Level 3 |
|
||||
| `workflow-state-machine.mermaid` | State machine showing license request and approval workflows | Business Logic |
|
||||
| `data-flow.mermaid` | Complete 11-step end-to-end sequence diagram from license submission to verification | Sequence |
|
||||
| `deployment-architecture.mermaid` | Docker Compose deployment topology with all services and networking | Infrastructure |
|
||||
|
||||
**Lines of Code**: 451 total
|
||||
|
||||
### 🌐 HTML Preview Files (.html)
|
||||
|
||||
Browser-viewable versions of each diagram using CDN-hosted mermaid.js:
|
||||
|
||||
| File | View In Browser |
|
||||
|------|-----------------|
|
||||
| `system-context.html` | Open in browser for interactive viewing |
|
||||
| `container-architecture.html` | Open in browser for interactive viewing |
|
||||
| `blockchain-architecture.html` | Open in browser for interactive viewing |
|
||||
| `workflow-state-machine.html` | Open in browser for interactive viewing |
|
||||
| `data-flow.html` | Open in browser for interactive viewing |
|
||||
| `deployment-architecture.html` | Open in browser for interactive viewing |
|
||||
|
||||
**Quick Start**:
|
||||
```bash
|
||||
# On Linux/Mac
|
||||
firefox system-context.html
|
||||
|
||||
# Or
|
||||
google-chrome container-architecture.html
|
||||
|
||||
# Or just open in your default browser
|
||||
open workflow-state-machine.html
|
||||
```
|
||||
|
||||
### 📚 Documentation Files
|
||||
|
||||
| File | Purpose | Size |
|
||||
|------|---------|------|
|
||||
| `ARCHITECTURE_GUIDE.md` | Comprehensive 1000+ line technical guide covering all architectural aspects | 28 KB |
|
||||
| `README.md` | Quick reference guide with diagram descriptions and PNG conversion instructions | 7 KB |
|
||||
| `INDEX.md` | This file - directory guide and navigation | |
|
||||
|
||||
### 🛠️ Utility Scripts
|
||||
|
||||
| File | Purpose |
|
||||
|------|---------|
|
||||
| `convert.js` | Generate HTML preview files from mermaid definitions |
|
||||
| `convert-to-png.js` | Provides PNG conversion instructions and guides |
|
||||
| `screenshot-diagrams.js` | Kroki.io conversion attempts and multi-option guide |
|
||||
|
||||
---
|
||||
|
||||
## Quick Navigation
|
||||
|
||||
### I want to...
|
||||
|
||||
**Understand the system at a glance**
|
||||
→ Open `system-context.html` in your browser
|
||||
|
||||
**See technical architecture details**
|
||||
→ Read `ARCHITECTURE_GUIDE.md` Section 2-3, or open `container-architecture.html`
|
||||
|
||||
**Understand the blockchain layer**
|
||||
→ Read `ARCHITECTURE_GUIDE.md` Section 3, or open `blockchain-architecture.html`
|
||||
|
||||
**Learn the approval workflow**
|
||||
→ Read `ARCHITECTURE_GUIDE.md` Section 4, or open `workflow-state-machine.html`
|
||||
|
||||
**See the complete data flow**
|
||||
→ Read `ARCHITECTURE_GUIDE.md` Section 5 (11-step process), or open `data-flow.html`
|
||||
|
||||
**Set up the development environment**
|
||||
→ Read `ARCHITECTURE_GUIDE.md` Section 6, or view `deployment-architecture.html`
|
||||
|
||||
**Convert diagrams to PNG**
|
||||
→ Read `README.md` (Options 1-5), or run `screenshot-diagrams.js`
|
||||
|
||||
**Get a technology overview**
|
||||
→ Read `ARCHITECTURE_GUIDE.md` Section 7 (Benefits), or Section 8 (Future)
|
||||
|
||||
---
|
||||
|
||||
## Key Technical Specifications
|
||||
|
||||
### Blockchain
|
||||
- **Platform**: Hyperledger Besu
|
||||
- **Consensus**: QBFT (Quorum Byzantine Fault Tolerant)
|
||||
- **Validators**: 4 nodes (requires 3/4 approval)
|
||||
- **Block Time**: ~12 seconds
|
||||
- **Network**: Private Permissioned
|
||||
|
||||
### Tokens
|
||||
- **Standard**: ERC-721 Soulbound
|
||||
- **Type**: Non-transferable license certificates
|
||||
- **Smart Contracts**: 4 (LicenseRequestNFT, ApprovalManager, DepartmentRegistry, WorkflowRegistry)
|
||||
|
||||
### Backend
|
||||
- **Framework**: NestJS (TypeScript)
|
||||
- **Database**: PostgreSQL
|
||||
- **Cache**: Redis
|
||||
- **Storage**: MinIO (S3-compatible)
|
||||
- **Port**: 3001
|
||||
|
||||
### Frontend
|
||||
- **Framework**: Next.js 14
|
||||
- **UI Components**: shadcn/ui
|
||||
- **Styling**: Tailwind CSS
|
||||
- **Port**: 3000
|
||||
|
||||
### Authentication (POC)
|
||||
- **Method**: API Key + Secret
|
||||
- **Future**: DigiLocker Integration (mocked)
|
||||
|
||||
---
|
||||
|
||||
## Diagram Descriptions
|
||||
|
||||
### 1. System Context Diagram
|
||||
|
||||
**Level**: C4 Context (Level 1)
|
||||
**Type**: Context Map
|
||||
**Viewers**: Non-technical stakeholders, Project managers
|
||||
|
||||
Shows the GEL platform as a black box with:
|
||||
- **External Actors**: Citizens, Government Departments, Department Operators, Platform Operators
|
||||
- **External Systems**: DigiLocker Mock, Legacy Department Systems, National Blockchain Federation
|
||||
- **Relationships**: Information flows between actors and platform
|
||||
|
||||
**Key Insights**:
|
||||
- Multi-stakeholder system with diverse user roles
|
||||
- Integration with existing government infrastructure
|
||||
- Future scalability through NBF integration
|
||||
|
||||
---
|
||||
|
||||
### 2. Container Architecture Diagram
|
||||
|
||||
**Level**: C4 Container (Level 2)
|
||||
**Type**: Architecture Diagram
|
||||
**Viewers**: Technical architects, DevOps engineers, Backend developers
|
||||
|
||||
Shows major system components:
|
||||
- **Frontend**: Next.js 14 + shadcn/ui (Port 3000)
|
||||
- **API Gateway**: NestJS with Auth, Workflow, Approval, Document services (Port 3001)
|
||||
- **Database**: PostgreSQL for persistent storage (Port 5432)
|
||||
- **Cache**: Redis for session and state management (Port 6379)
|
||||
- **Storage**: MinIO for documents and certificates (Port 9000)
|
||||
- **Blockchain**: Hyperledger Besu network (Port 8545+)
|
||||
|
||||
**Key Insights**:
|
||||
- Layered architecture enables independent scaling
|
||||
- Off-chain storage with on-chain hashing ensures efficiency
|
||||
- Redis provides real-time state synchronization
|
||||
|
||||
---
|
||||
|
||||
### 3. Blockchain Architecture Diagram
|
||||
|
||||
**Level**: C4 Component (Level 3)
|
||||
**Type**: Detailed Technical Diagram
|
||||
**Viewers**: Blockchain developers, Smart contract engineers
|
||||
|
||||
Shows:
|
||||
- **4 Validator Nodes**: QBFT consensus topology
|
||||
- **Smart Contracts**:
|
||||
- LicenseRequestNFT (ERC-721 Soulbound)
|
||||
- ApprovalManager (records approvals)
|
||||
- DepartmentRegistry (manages departments)
|
||||
- WorkflowRegistry (defines workflows)
|
||||
- **On-Chain Data**: NFT state, approvals, registry info
|
||||
- **Off-Chain Data**: Document details, applicant info, workflow state
|
||||
- **Data Linking**: SHA-256 hashing creates immutable bridge
|
||||
|
||||
**Key Insights**:
|
||||
- Hybrid on-chain/off-chain approach optimizes cost and performance
|
||||
- QBFT requires 3/4 validator agreement for finality
|
||||
- Hashing ensures off-chain data integrity
|
||||
|
||||
---
|
||||
|
||||
### 4. Workflow State Machine Diagram
|
||||
|
||||
**Level**: Business Logic
|
||||
**Type**: State Diagram
|
||||
**Viewers**: Business analysts, QA engineers, Product managers
|
||||
|
||||
Shows:
|
||||
- **Request States**: DRAFT → SUBMITTED → IN_REVIEW → APPROVED/REJECTED/REVOKED
|
||||
- **Approval States**: PENDING → APPROVED/REJECTED/CHANGES_REQUESTED
|
||||
- **Transitions**: Rules for moving between states
|
||||
- **Terminal States**: APPROVED, REJECTED (with paths for reapplication)
|
||||
|
||||
**Key Insights**:
|
||||
- Supports iterative approval processes (PENDING_RESUBMISSION)
|
||||
- Multi-department flexibility (parallel or sequential)
|
||||
- Clear audit trail with state history
|
||||
|
||||
---
|
||||
|
||||
### 5. Data Flow Diagram
|
||||
|
||||
**Level**: Sequence
|
||||
**Type**: Sequence Diagram
|
||||
**Viewers**: Integration engineers, Backend developers, QA team
|
||||
|
||||
11-Step Process:
|
||||
1. License Request Creation
|
||||
2. Document Upload & Hashing
|
||||
3. Blockchain Hash Recording
|
||||
4. State Update to SUBMITTED
|
||||
5. Route to Department 1 (parallel)
|
||||
6. Route to Department 2 (parallel)
|
||||
7. Department 1 Approval
|
||||
8. Department 2 Approval (parallel)
|
||||
9. Final Approval & NFT Minting
|
||||
10. Notifications & State Update
|
||||
11. License Verification
|
||||
|
||||
**Key Insights**:
|
||||
- Parallel approvals reduce total approval time
|
||||
- Immutable blockchain recording ensures accountability
|
||||
- WebSocket notifications keep stakeholders informed
|
||||
- Verification requires only blockchain query (decentralized)
|
||||
|
||||
---
|
||||
|
||||
### 6. Deployment Architecture Diagram
|
||||
|
||||
**Level**: Infrastructure
|
||||
**Type**: Deployment Diagram
|
||||
**Viewers**: DevOps engineers, System administrators, Infrastructure team
|
||||
|
||||
Shows:
|
||||
- **Docker Compose Setup**: All services containerized
|
||||
- **Networking**: gel-network bridge with defined subnets
|
||||
- **Volumes**: Named volumes for persistent data
|
||||
- **Service Dependencies**: Build order and healthchecks
|
||||
- **Monitoring**: Prometheus & Grafana integration
|
||||
- **Port Mappings**: All service ports clearly labeled
|
||||
|
||||
**Key Insights**:
|
||||
- Single docker-compose file enables reproducible deployments
|
||||
- Health checks ensure service reliability
|
||||
- Monitoring integration enables production observability
|
||||
- Volumes ensure data persistence across restarts
|
||||
|
||||
---
|
||||
|
||||
## Viewing the Diagrams
|
||||
|
||||
### Option 1: Browser Preview (Recommended for Quick Review)
|
||||
|
||||
Open any .html file in your web browser:
|
||||
|
||||
```bash
|
||||
# Examples
|
||||
firefox /sessions/cool-elegant-faraday/mnt/Goa-GEL/system-context.html
|
||||
google-chrome /sessions/cool-elegant-faraday/mnt/Goa-GEL/container-architecture.html
|
||||
open /sessions/cool-elegant-faraday/mnt/Goa-GEL/workflow-state-machine.html # macOS
|
||||
```
|
||||
|
||||
Benefits:
|
||||
- No installation required
|
||||
- Instant rendering
|
||||
- Interactive viewing
|
||||
- Works offline (after loading)
|
||||
|
||||
### Option 2: Mermaid Live (Online, Interactive)
|
||||
|
||||
Visit https://mermaid.live and:
|
||||
1. Click "Paste into editor"
|
||||
2. Copy content from any .mermaid file
|
||||
3. Instant visualization
|
||||
4. Export as PNG, SVG, PDF
|
||||
|
||||
### Option 3: Convert to PNG
|
||||
|
||||
See `README.md` for 5 different conversion methods:
|
||||
1. **Mermaid Live** - Easiest, no installation
|
||||
2. **NPM CLI** - Local installation
|
||||
3. **Docker** - Containerized conversion
|
||||
4. **Browser DevTools** - Manual screenshot
|
||||
5. **Kroki.io** - Online API service
|
||||
|
||||
---
|
||||
|
||||
## Smart Contract Details
|
||||
|
||||
### LicenseRequestNFT (ERC-721 Soulbound)
|
||||
|
||||
```solidity
|
||||
// Non-transferable license certificates
|
||||
// Functions: mint(), burn(), ownerOf(), tokenURI()
|
||||
// Properties: Cannot be sold or transferred
|
||||
// Use Case: Permanent license ownership record
|
||||
```
|
||||
|
||||
**Key Features**:
|
||||
- ERC-721 standard compliance
|
||||
- Soulbound (non-transferable)
|
||||
- Metadata stored in MinIO, URI on-chain
|
||||
- Immutable once issued
|
||||
|
||||
### ApprovalManager
|
||||
|
||||
```solidity
|
||||
// Records multi-department approvals
|
||||
// Functions: recordApproval(), recordRejection(), requestChanges()
|
||||
// Data: Complete approval chain with signatures
|
||||
// Use Case: Transparent approval workflow
|
||||
```
|
||||
|
||||
**Key Features**:
|
||||
- Approval signatures prevent repudiation
|
||||
- Full history queryable on-chain
|
||||
- Reason tracking for rejections
|
||||
- Change request details stored
|
||||
|
||||
### DepartmentRegistry
|
||||
|
||||
```solidity
|
||||
// Manages department information
|
||||
// Functions: registerDepartment(), setApprovers(), getApprovers()
|
||||
// Use Case: Access control and authority verification
|
||||
```
|
||||
|
||||
**Key Features**:
|
||||
- Department metadata storage
|
||||
- Approver list management
|
||||
- Active/inactive status tracking
|
||||
|
||||
### WorkflowRegistry
|
||||
|
||||
```solidity
|
||||
// Defines license approval workflows
|
||||
// Functions: defineWorkflow(), getWorkflow(), getNextApprovers()
|
||||
// Use Case: Flexible workflow configuration
|
||||
```
|
||||
|
||||
**Key Features**:
|
||||
- License-type specific workflows
|
||||
- Sequential or parallel approval modes
|
||||
- Timeout configurations
|
||||
- Department ordering
|
||||
|
||||
---
|
||||
|
||||
## Database Schema (PostgreSQL)
|
||||
|
||||
### Key Tables
|
||||
|
||||
```sql
|
||||
-- License Requests
|
||||
license_requests (
|
||||
id, applicant_id, license_type, status,
|
||||
blockchain_tx_hash, blockchain_block_num,
|
||||
nft_token_id, created_at, submitted_at, approved_at
|
||||
)
|
||||
|
||||
-- Multi-Department Approvals
|
||||
approvals (
|
||||
id, license_id, department, status,
|
||||
reviewed_by, reviewed_at, comments, signature
|
||||
)
|
||||
|
||||
-- Document Metadata
|
||||
documents (
|
||||
id, license_id, filename, content_hash,
|
||||
file_size, file_type, uploaded_at, minio_path
|
||||
)
|
||||
|
||||
-- Audit Logs
|
||||
audit_logs (
|
||||
id, license_id, action, user_id,
|
||||
old_status, new_status, timestamp
|
||||
)
|
||||
|
||||
-- Department Registry
|
||||
departments (
|
||||
id, name, is_active, metadata,
|
||||
created_at, updated_at
|
||||
)
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## File Locations
|
||||
|
||||
All files are located in:
|
||||
```
|
||||
/sessions/cool-elegant-faraday/mnt/Goa-GEL/
|
||||
```
|
||||
|
||||
### Complete File List
|
||||
|
||||
```
|
||||
├── system-context.mermaid (40 lines)
|
||||
├── system-context.html (76 lines)
|
||||
├── container-architecture.mermaid (64 lines)
|
||||
├── container-architecture.html (100 lines)
|
||||
├── blockchain-architecture.mermaid (75 lines)
|
||||
├── blockchain-architecture.html (111 lines)
|
||||
├── workflow-state-machine.mermaid (65 lines)
|
||||
├── workflow-state-machine.html (101 lines)
|
||||
├── data-flow.mermaid (105 lines)
|
||||
├── data-flow.html (141 lines)
|
||||
├── deployment-architecture.mermaid (102 lines)
|
||||
├── deployment-architecture.html (138 lines)
|
||||
├── convert.js (71 lines)
|
||||
├── convert-to-png.js (235 lines)
|
||||
├── screenshot-diagrams.js (156 lines)
|
||||
├── README.md (225 lines)
|
||||
├── ARCHITECTURE_GUIDE.md (1018 lines)
|
||||
└── INDEX.md (this file)
|
||||
```
|
||||
|
||||
**Total**: 2,823 lines of diagrams, code, and documentation
|
||||
|
||||
---
|
||||
|
||||
## Getting Started
|
||||
|
||||
### Step 1: View Diagrams
|
||||
Open any .html file in your web browser to see the diagrams rendered.
|
||||
|
||||
### Step 2: Read Documentation
|
||||
Start with `README.md` for an overview, then read specific sections in `ARCHITECTURE_GUIDE.md` based on your role:
|
||||
|
||||
- **Project Manager**: Sections 1, 7, 8
|
||||
- **Backend Developer**: Sections 2, 3, 5, 6
|
||||
- **Frontend Developer**: Section 2 (Frontend Layer)
|
||||
- **DevOps Engineer**: Sections 3 (Blockchain), 6 (Deployment)
|
||||
- **Blockchain Developer**: Sections 3 (Smart Contracts)
|
||||
- **QA/Tester**: Sections 4, 5 (Workflows)
|
||||
|
||||
### Step 3: Understand the Flow
|
||||
Review the data flow diagram (Section 5) to understand the complete end-to-end process.
|
||||
|
||||
### Step 4: Plan Implementation
|
||||
Use the deployment architecture (Section 6) and smart contract details (Section 3) to begin development.
|
||||
|
||||
---
|
||||
|
||||
## Key Takeaways
|
||||
|
||||
### Architecture Highlights
|
||||
✓ **Multi-layered design** separates concerns and enables scaling
|
||||
✓ **Hybrid blockchain approach** optimizes cost and performance
|
||||
✓ **Immutable records** prevent tampering and ensure trust
|
||||
✓ **Parallel workflows** reduce approval time
|
||||
✓ **Soulbound NFTs** enable non-transferable license ownership
|
||||
✓ **Open standards** (ERC-721, REST API) ensure interoperability
|
||||
|
||||
### Technical Strengths
|
||||
✓ **QBFT Consensus** ensures high finality (3/4 Byzantine fault tolerant)
|
||||
✓ **Off-chain storage** with on-chain hashing optimizes costs
|
||||
✓ **Real-time caching** via Redis reduces database load
|
||||
✓ **Docker Compose** enables reproducible deployments
|
||||
✓ **Comprehensive audit trail** supports compliance and investigations
|
||||
|
||||
### Business Benefits
|
||||
✓ **Transparent verification** builds citizen trust
|
||||
✓ **Multi-department coordination** streamlines approvals
|
||||
✓ **Immutable certificates** prevent fraud
|
||||
✓ **Future interoperability** via blockchain standards
|
||||
✓ **Scalable architecture** supports growth
|
||||
|
||||
---
|
||||
|
||||
## Support & Questions
|
||||
|
||||
For questions about specific diagrams or architecture decisions:
|
||||
|
||||
1. **System Context**: See ARCHITECTURE_GUIDE.md Section 1
|
||||
2. **Container Architecture**: See ARCHITECTURE_GUIDE.md Section 2
|
||||
3. **Blockchain Details**: See ARCHITECTURE_GUIDE.md Section 3
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4. **Workflows**: See ARCHITECTURE_GUIDE.md Section 4
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5. **Data Flow**: See ARCHITECTURE_GUIDE.md Section 5
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6. **Deployment**: See ARCHITECTURE_GUIDE.md Section 6
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7. **Conversion Help**: See README.md (Options 1-5)
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---
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## Appendix: Technology Stack Summary
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| Component | Technology | Version | Purpose |
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|-----------|-----------|---------|---------|
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| Blockchain | Hyperledger Besu | Latest | QBFT consensus, smart contracts |
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| Consensus | QBFT | - | Byzantine fault tolerant agreement |
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| Tokens | ERC-721 Soulbound | - | Non-transferable licenses |
|
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| Backend | NestJS | TypeScript | REST API, business logic |
|
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| Database | PostgreSQL | 15+ | Persistent data storage |
|
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| Cache | Redis | 7+ | Session, state management |
|
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| Storage | MinIO | Latest | S3-compatible file storage |
|
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| Frontend | Next.js | 14+ | React-based UI |
|
||||
| UI Components | shadcn/ui | Latest | Accessible components |
|
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| Styling | Tailwind CSS | Latest | Utility-first CSS |
|
||||
| DevOps | Docker Compose | Latest | Containerization, orchestration |
|
||||
| Monitoring | Prometheus | Latest | Metrics collection |
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| Visualization | Grafana | Latest | Dashboard creation |
|
||||
|
||||
---
|
||||
|
||||
**Document Version**: 1.0
|
||||
**Created**: 2026-02-03
|
||||
**Platform**: Goa GEL (Government E-License)
|
||||
**Phase**: POC 1.0
|
||||
**Status**: Complete
|
||||
**Diagrams**: 6 (C4 + Business Logic)
|
||||
**Documentation**: 1,243 lines
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**Total Artifacts**: 18 files
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||||
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||||
---
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||||
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*For the latest version of these diagrams, visit the source directory.*
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||||
Reference in New Issue
Block a user