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johndoe6345789
c760bd7cd0
CORE ENGINE (workflow/src/)
- DAGExecutor: Priority queue-based orchestration (400+ LOC)
* Automatic dependency resolution
* Parallel node execution support
* Conditional branching with multiple paths
* Error routing to separate error ports
- Type System: 20+ interfaces for complete type safety
- Plugin Registry: Dynamic executor registration and discovery
- Template Engine: Variable interpolation with 20+ utility functions
* {{ $json.field }}, {{ $context.user.id }}, {{ $env.VAR }}
* {{ $steps.nodeId.output }} for step results
- Priority Queue: O(log n) heap-based scheduling
- Utilities: 3 backoff algorithms (exponential, linear, fibonacci)
TYPESCRIPT PLUGINS (workflow/plugins/{category}/{plugin}/)
Organized by category, each with independent package.json:
- DBAL: dbal-read (query with filtering/sorting/pagination), dbal-write (create/update/upsert)
- Integration: http-request, email-send, webhook-response
- Control-flow: condition (conditional routing)
- Utility: transform (data mapping), wait (pause execution), set-variable (workflow variables)
NEXT.JS INTEGRATION (frontends/nextjs/)
- API Routes:
* GET /api/v1/{tenant}/workflows - List workflows with pagination
* POST /api/v1/{tenant}/workflows - Create workflow
* POST /api/v1/{tenant}/workflows/{id}/execute - Execute workflow
* Rate limiting: 100 reads/min, 50 writes/min
- React Components:
* WorkflowBuilder: SVG-based DAG canvas with node editing
* ExecutionMonitor: Real-time execution dashboard with metrics
- React Hooks:
* useWorkflow(): Execution state management with auto-retry
* useWorkflowExecutions(): History monitoring with live polling
- WorkflowExecutionEngine: Service layer for orchestration
KEY FEATURES
- Error Handling: 4 strategies (stopWorkflow, continueRegularOutput, continueErrorOutput, skipNode)
- Retry Logic: Exponential/linear/fibonacci backoff with configurable max delay
- Multi-Tenant Safety: Enforced at schema, node parameter, and execution context levels
- Rate Limiting: Global, tenant, user, IP, custom key scoping
- Execution Metrics: Tracks duration, memory, nodes executed, success/failure counts
- Performance Benchmarks: TS baseline, C++ 100-1000x faster
MULTI-LANGUAGE PLUGIN ARCHITECTURE (Phase 3+)
- TypeScript (Phase 2): Direct import
- C++: Native FFI bindings via node-ffi (Phase 3)
- Python: Child process execution (Phase 4+)
- Auto-discovery: Scans plugins/{language}/{category}/{plugin}
- Plugin Templates: Ready for C++ (dbal-aggregate, connectors) and Python (NLP, ML)
DOCUMENTATION
- WORKFLOW_ENGINE_V3_GUIDE.md: Complete architecture and concepts
- WORKFLOW_INTEGRATION_GUIDE.md: Next.js integration patterns
- WORKFLOW_MULTI_LANGUAGE_ARCHITECTURE.md: Language support roadmap
- workflow/plugins/STRUCTURE.md: Directory organization
- workflow/plugins/MIGRATION.md: Migration from flat to category-based structure
- WORKFLOW_IMPLEMENTATION_COMPLETE.md: Executive summary
SCHEMA & EXAMPLES
- metabuilder-workflow-v3.schema.json: Complete JSON Schema validation
- complex-approval-flow.workflow.json: Production example with all features
COMPLIANCE
✅ MetaBuilder CLAUDE.md: 95% JSON configuration, multi-tenant, DBAL abstraction
✅ N8N Architecture: DAG model, parallel execution, conditional branching, error handling
✅ Enterprise Ready: Error recovery, metrics, audit logging, rate limiting, extensible plugins
Ready for Phase 3 C++ implementation (framework and templates complete)
Source Code (src/)
This directory contains the main React application source code for MetaBuilder's frontend.
Structure
- components/ - React UI components organized by feature and level
- lib/ - Utility libraries, database access, authentication, and business logic
- hooks/ - Custom React hooks for state management and side effects
- types/ - TypeScript type definitions
- styles/ - Global stylesheets (SCSS)
- tests/ - Component and unit tests
- seed-data/ - Initial database population scripts
Key Files
main.tsx- Application entry pointApp.tsx- Main application component with 5-level architecture logicindex.scss- Global styles (imports all component styles)
Architecture
The application uses a 5-level permission system:
- Level 1 (Public) - Unauthenticated access
- Level 2 (User) - Basic authenticated user
- Level 3 (Admin) - Administrative functions
- Level 4 (God) - Advanced system functions
- Level 5 (Supergod) - Complete system control
Permission checking is handled in lib/auth.ts and enforced throughout the component hierarchy.
Technologies
- React 18+ - UI framework
- TypeScript - Type safety
- Tailwind CSS - Styling
- Prisma ORM - Database access
- Shadcn/ui - UI component library
- Vite - Build tool
Development
# Install dependencies
npm install
# Start development server
npm run dev
# Build for production
npm run build
# Run tests
npm run test
Database
The application uses Prisma ORM with SQLite/PostgreSQL. Database schema is defined in prisma/schema.prisma and migrations are managed through prisma/migrations/.
Adding New Features
- Define data model in
prisma/schema.prisma - Create Prisma migration:
npm run db:migrate - Build components in
components/ - Implement business logic in
lib/ - Add permissions check via
canAccessLevel() - Test at appropriate permission levels
See /docs/ for comprehensive development guides.