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https://github.com/johndoe6345789/metabuilder.git
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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)
634 lines
15 KiB
JSON
634 lines
15 KiB
JSON
{
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"id": "wf-001-approval-flow",
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"name": "Complex Approval Workflow with Notifications",
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"description": "Multi-stage approval workflow with parallel validations, conditional routing, and retry logic",
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"version": "3.0.0",
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"tenantId": "acme-corp",
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"createdBy": "user-123",
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"createdAt": "2026-01-21T10:00:00Z",
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"updatedAt": "2026-01-21T10:00:00Z",
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"active": true,
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"locked": false,
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"tags": ["approval", "workflow", "multi-stage"],
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"category": "approval",
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"settings": {
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"timezone": "America/New_York",
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"executionTimeout": 3600,
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"saveExecutionProgress": true,
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"saveExecutionData": "all",
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"maxConcurrentExecutions": 5,
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"debugMode": false,
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"enableNotifications": true,
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"notificationChannels": ["email", "webhook"]
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},
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"nodes": [
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{
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"id": "trigger-webhook",
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"name": "Approval Request Received",
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"type": "trigger",
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"typeVersion": 1,
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"nodeType": "webhook-trigger",
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"position": [50, 150],
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"parameters": {
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"httpMethod": "POST",
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"path": "/workflows/approvals"
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},
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"inputs": [],
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"outputs": [
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{
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"name": "main",
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"type": "main",
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"maxConnections": -1
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}
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],
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"disabled": false,
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"skipOnFail": false,
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"alwaysOutputData": true,
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"maxTries": 1,
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"waitBetweenTries": 0,
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"continueOnError": false,
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"onError": "stopWorkflow",
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"notes": "Receives approval requests from external system",
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"notesInFlow": true,
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"color": "#3498db",
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"metadata": {}
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},
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{
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"id": "validate-request",
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"name": "Validate Request Data",
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"type": "operation",
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"typeVersion": 1,
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"nodeType": "dbal-read",
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"position": [250, 150],
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"parameters": {
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"entity": "ApprovalRequest",
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"operation": "validate",
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"rules": {
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"requestId": "required|uuid",
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"amount": "required|number|min:1|max:1000000",
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"requesterEmail": "required|email"
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}
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},
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"inputs": [
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{
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"name": "main",
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"type": "main",
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"maxConnections": -1
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}
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],
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"outputs": [
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{
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"name": "main",
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"type": "main",
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"maxConnections": -1,
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"label": "Valid"
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},
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{
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"name": "error",
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"type": "error",
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"maxConnections": -1,
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"label": "Invalid"
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}
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],
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"disabled": false,
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"skipOnFail": false,
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"alwaysOutputData": false,
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"maxTries": 1,
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"waitBetweenTries": 0,
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"continueOnError": false,
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"onError": "continueErrorOutput",
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"metadata": {}
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},
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{
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"id": "parallel-checks",
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"name": "Run Parallel Validations",
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"type": "parallel",
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"typeVersion": 1,
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"nodeType": "parallel",
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"position": [450, 150],
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"parameters": {
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"tasks": [
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{
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"nodeId": "check-budget",
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"type": "main"
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},
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{
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"nodeId": "check-user-permissions",
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"type": "main"
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},
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{
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"nodeId": "check-fraud-rules",
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"type": "main"
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}
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]
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},
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"inputs": [
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{
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"name": "main",
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"type": "main",
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"maxConnections": -1
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}
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],
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"outputs": [
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{
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"name": "main",
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"type": "main",
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"maxConnections": -1
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}
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],
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"disabled": false,
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"skipOnFail": false,
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"alwaysOutputData": false,
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"maxTries": 1,
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"waitBetweenTries": 0,
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"continueOnError": false,
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"onError": "stopWorkflow",
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"metadata": {}
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},
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{
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"id": "check-budget",
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"name": "Check Available Budget",
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"type": "operation",
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"typeVersion": 1,
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"nodeType": "dbal-read",
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"position": [450, 50],
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"parameters": {
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"entity": "BudgetAllocation",
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"operation": "read",
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"filter": {
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"departmentId": "{{ $json.departmentId }}"
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}
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},
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"inputs": [
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{
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"name": "main",
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"type": "main",
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"maxConnections": 1
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}
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],
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"outputs": [
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{
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"name": "main",
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"type": "main",
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"maxConnections": -1
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}
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],
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"disabled": false,
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"skipOnFail": false,
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"alwaysOutputData": false,
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"retryPolicy": {
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"enabled": true,
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"maxAttempts": 3,
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"backoffType": "exponential",
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"initialDelay": 1000,
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"maxDelay": 30000,
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"retryableErrors": ["TIMEOUT", "TEMPORARY_FAILURE"],
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"retryableStatusCodes": [408, 429, 500, 502, 503]
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},
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"maxTries": 3,
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"waitBetweenTries": 1000,
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"continueOnError": false,
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"onError": "continueErrorOutput",
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"notes": "Checks if department has sufficient budget",
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"notesInFlow": false,
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"metadata": {}
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},
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{
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"id": "check-user-permissions",
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"name": "Verify User Permissions",
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"type": "operation",
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"typeVersion": 1,
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"nodeType": "dbal-read",
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"position": [450, 150],
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"parameters": {
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"entity": "UserRole",
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"operation": "read",
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"filter": {
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"userId": "{{ $context.user.id }}",
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"tenantId": "{{ $context.tenantId }}"
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}
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},
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"inputs": [
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{
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"name": "main",
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"type": "main",
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"maxConnections": 1
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}
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],
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"outputs": [
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{
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"name": "main",
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"type": "main",
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"maxConnections": -1
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}
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],
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"disabled": false,
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"skipOnFail": false,
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"alwaysOutputData": false,
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"maxTries": 1,
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"waitBetweenTries": 0,
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"continueOnError": false,
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"onError": "continueErrorOutput",
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"metadata": {}
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},
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{
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"id": "check-fraud-rules",
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"name": "Run Fraud Detection",
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"type": "operation",
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"typeVersion": 1,
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"nodeType": "http-request",
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"position": [450, 250],
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"parameters": {
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"url": "{{ $env.FRAUD_API_URL }}/check",
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"method": "POST",
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"body": {
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"amount": "{{ $json.amount }}",
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"requesterEmail": "{{ $json.requesterEmail }}",
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"metadata": "{{ $json }}"
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},
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"headers": {
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"Authorization": "Bearer {{ $env.FRAUD_API_KEY }}"
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}
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},
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"inputs": [
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{
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"name": "main",
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"type": "main",
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"maxConnections": 1
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}
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],
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"outputs": [
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{
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"name": "main",
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"type": "main",
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"maxConnections": -1
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},
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{
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"name": "error",
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"type": "error",
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"maxConnections": -1
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}
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],
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"credentials": {
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"api": {
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"id": "cred-fraud-api",
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"name": "Fraud API Key"
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}
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},
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"disabled": false,
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"skipOnFail": false,
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"alwaysOutputData": false,
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"timeout": 30,
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"maxTries": 2,
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"waitBetweenTries": 2000,
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"continueOnError": false,
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"onError": "continueErrorOutput",
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"metadata": {}
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},
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{
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"id": "all-checks-passed",
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"name": "All Validations Passed?",
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"type": "logic",
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"typeVersion": 1,
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"nodeType": "condition",
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"position": [650, 150],
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"parameters": {
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"condition": "{{ $steps['check-budget'].success && $steps['check-user-permissions'].success && $steps['check-fraud-rules'].success }}"
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},
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"inputs": [
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{
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"name": "main",
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"type": "main",
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"maxConnections": -1
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}
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],
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"outputs": [
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{
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"name": "main",
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"type": "success",
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"index": 0,
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"label": "Yes"
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},
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{
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"name": "main",
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"type": "condition",
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"index": 1,
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"label": "No"
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}
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],
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"disabled": false,
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"skipOnFail": false,
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"alwaysOutputData": false,
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"continueOnError": false,
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"onError": "stopWorkflow",
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"metadata": {}
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},
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{
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"id": "send-for-approval",
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"name": "Create Approval Record",
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"type": "operation",
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"typeVersion": 1,
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"nodeType": "dbal-write",
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"position": [850, 50],
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"parameters": {
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"entity": "Approval",
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"operation": "create",
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"data": {
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"requestId": "{{ $json.requestId }}",
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"amount": "{{ $json.amount }}",
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"requesterEmail": "{{ $json.requesterEmail }}",
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"status": "pending",
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"createdAt": "{{ $now }}"
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}
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},
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"inputs": [
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{
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"name": "main",
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"type": "main",
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"maxConnections": 1
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}
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],
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"outputs": [
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{
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"name": "main",
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"type": "main",
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"maxConnections": -1
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}
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],
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"disabled": false,
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"skipOnFail": false,
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"alwaysOutputData": false,
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"maxTries": 1,
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"waitBetweenTries": 0,
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"continueOnError": false,
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"onError": "stopWorkflow",
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"metadata": {}
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},
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{
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"id": "notify-approvers",
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"name": "Send Approval Notification",
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"type": "action",
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"typeVersion": 1,
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"nodeType": "email-send",
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"position": [850, 150],
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"parameters": {
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"to": "{{ $env.APPROVER_EMAIL }}",
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"subject": "New Approval Request: ${{ $json.amount }}",
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"template": "approval-notification",
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"data": {
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"requestId": "{{ $json.requestId }}",
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"amount": "{{ $json.amount }}",
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"requester": "{{ $json.requesterEmail }}",
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"approvalLink": "{{ $env.APP_URL }}/approvals/{{ $steps['send-for-approval'].output.id }}"
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}
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},
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"inputs": [
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{
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"name": "main",
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"type": "main",
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"maxConnections": 1
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}
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],
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"outputs": [
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{
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"name": "main",
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"type": "main",
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"maxConnections": -1
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}
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],
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"disabled": false,
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"skipOnFail": false,
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"alwaysOutputData": false,
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"maxTries": 2,
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"waitBetweenTries": 3000,
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"continueOnError": true,
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"onError": "continueRegularOutput",
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"metadata": {}
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},
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{
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"id": "send-error-notification",
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"name": "Notify on Validation Failure",
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"type": "action",
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"typeVersion": 1,
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"nodeType": "email-send",
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"position": [850, 250],
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"parameters": {
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"to": "{{ $json.requesterEmail }}",
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"subject": "Approval Request Failed Validation",
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"template": "approval-failure",
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"data": {
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"requestId": "{{ $json.requestId }}",
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"reason": "{{ $steps['all-checks-passed'].error.message }}"
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}
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},
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"inputs": [
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{
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"name": "main",
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"type": "main",
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"maxConnections": 1
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}
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],
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"outputs": [
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{
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"name": "main",
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"type": "main",
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"maxConnections": -1
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}
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],
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"disabled": false,
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"skipOnFail": false,
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"alwaysOutputData": false,
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"continueOnError": true,
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"onError": "continueRegularOutput",
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"metadata": {}
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},
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{
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"id": "return-result",
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"name": "Return Result",
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"type": "action",
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"typeVersion": 1,
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"nodeType": "webhook-response",
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"position": [1050, 150],
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"parameters": {
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"statusCode": 200,
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"body": {
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"success": true,
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"approvalId": "{{ $steps['send-for-approval'].output.id }}",
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"message": "Approval request created successfully"
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}
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},
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"inputs": [
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{
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"name": "main",
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"type": "main",
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"maxConnections": -1
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}
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],
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"outputs": [],
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"disabled": false,
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"skipOnFail": false,
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"alwaysOutputData": false,
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"continueOnError": false,
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"onError": "stopWorkflow",
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"metadata": {}
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}
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],
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"connections": {
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"trigger-webhook": {
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"main": {
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"0": [
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{
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"node": "validate-request",
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"type": "main",
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"index": 0
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}
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]
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}
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},
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"validate-request": {
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"main": {
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"0": [
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{
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"node": "parallel-checks",
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"type": "main",
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"index": 0
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}
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]
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},
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"error": {
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"0": [
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{
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"node": "send-error-notification",
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"type": "main",
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"index": 0
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}
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]
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}
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},
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"parallel-checks": {
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"main": {
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"0": [
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{
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"node": "all-checks-passed",
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"type": "main",
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"index": 0
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}
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]
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}
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},
|
|
"all-checks-passed": {
|
|
"main": {
|
|
"0": [
|
|
{
|
|
"node": "send-for-approval",
|
|
"type": "main",
|
|
"index": 0
|
|
}
|
|
]
|
|
},
|
|
"error": {
|
|
"0": [
|
|
{
|
|
"node": "send-error-notification",
|
|
"type": "main",
|
|
"index": 0
|
|
}
|
|
]
|
|
}
|
|
},
|
|
"send-for-approval": {
|
|
"main": {
|
|
"0": [
|
|
{
|
|
"node": "notify-approvers",
|
|
"type": "main",
|
|
"index": 0
|
|
}
|
|
]
|
|
}
|
|
},
|
|
"notify-approvers": {
|
|
"main": {
|
|
"0": [
|
|
{
|
|
"node": "return-result",
|
|
"type": "main",
|
|
"index": 0
|
|
}
|
|
]
|
|
}
|
|
}
|
|
},
|
|
"triggers": [
|
|
{
|
|
"nodeId": "trigger-webhook",
|
|
"kind": "webhook",
|
|
"enabled": true,
|
|
"webhookId": "wh-001",
|
|
"webhookMethods": ["POST"],
|
|
"metadata": {
|
|
"description": "Approval request webhook"
|
|
}
|
|
}
|
|
],
|
|
"variables": {
|
|
"approverEmail": {
|
|
"name": "approverEmail",
|
|
"type": "string",
|
|
"description": "Email of approval authority",
|
|
"required": true,
|
|
"scope": "workflow"
|
|
},
|
|
"fraudThreshold": {
|
|
"name": "fraudThreshold",
|
|
"type": "number",
|
|
"description": "Fraud risk score threshold",
|
|
"defaultValue": 0.8,
|
|
"scope": "workflow"
|
|
}
|
|
},
|
|
"errorHandling": {
|
|
"default": "stopWorkflow",
|
|
"errorLogger": "send-error-notification",
|
|
"errorNotification": true,
|
|
"notifyChannels": ["email"]
|
|
},
|
|
"retryPolicy": {
|
|
"enabled": true,
|
|
"maxAttempts": 3,
|
|
"backoffType": "exponential",
|
|
"initialDelay": 1000,
|
|
"maxDelay": 30000,
|
|
"retryableErrors": ["TIMEOUT", "TEMPORARY_FAILURE"],
|
|
"retryableStatusCodes": [408, 429, 500, 502, 503, 504]
|
|
},
|
|
"rateLimiting": {
|
|
"enabled": true,
|
|
"requestsPerWindow": 100,
|
|
"windowSeconds": 60,
|
|
"key": "tenant",
|
|
"onLimitExceeded": "queue"
|
|
},
|
|
"credentials": [],
|
|
"metadata": {
|
|
"category": "business-process",
|
|
"department": "finance",
|
|
"sla": "4-hours",
|
|
"owner": "finance-team"
|
|
},
|
|
"executionLimits": {
|
|
"maxExecutionTime": 3600,
|
|
"maxMemoryMb": 512,
|
|
"maxDataSizeMb": 50,
|
|
"maxArrayItems": 10000
|
|
},
|
|
"multiTenancy": {
|
|
"enforced": true,
|
|
"tenantIdField": "tenantId",
|
|
"restrictNodeTypes": ["raw-sql", "eval", "shell-exec"],
|
|
"allowCrossTenantAccess": false,
|
|
"auditLogging": true
|
|
},
|
|
"versionHistory": []
|
|
}
|