provisioning/docs/src/architecture

Architecture Documentation

This directory contains comprehensive architecture documentation for provisioning, including Architecture Decision Records (ADRs) and system design documentation.

Architecture Decision Records (ADRs)

ADRs document the major architectural decisions made for the system, including context, rationale, and consequences:

• ADR-001: Project Structure Decision - Domain-driven hybrid structure organization
• ADR-002: Distribution Strategy - Layered distribution with workspace separation
• ADR-003: Workspace Isolation - Isolated user workspaces with hierarchical configuration
• ADR-004: Hybrid Architecture - Rust coordination layer with Nushell business logic
• ADR-005: Extension Framework - Registry-based extension system with manifest-driven loading

System Design Documentation

Comprehensive documentation covering system architecture, integration patterns, and design principles:

System Overview

High-level architecture overview including:

• Executive summary and key achievements
• Component architecture with diagrams
• Technology stack and dependencies
• Performance and scalability characteristics
• Security architecture and quality attributes

Integration Patterns

Detailed integration patterns and implementations:

• Hybrid language integration (Rust ↔ Nushell)
• Provider abstraction and multi-cloud support
• Configuration resolution and variable interpolation
• Workflow orchestration and dependency management
• State management and checkpoint recovery
• Event-driven architecture and messaging
• Extension integration and API patterns
• Error handling and performance optimization

Design Principles

Core architectural principles and guidelines:

• Project Architecture Principles (PAP) compliance
• Hybrid architecture optimization strategies
• Configuration-first architecture approach
• Domain-driven structural organization
• Quality attribute principles (reliability, performance, security)
• Error handling and observability principles
• Evolution and maintenance strategies

Key Architectural Achievements

🚀 Batch Workflow System (v3.1.0)

• Provider-Agnostic Design: Mixed UpCloud, AWS, and local provider support
• Advanced Orchestration: Dependency resolution, parallel execution, and rollback capabilities
• Real-time Monitoring: Live workflow progress tracking and health monitoring

🏗️ Hybrid Orchestrator Architecture (v3.0.0)

• Performance Solution: Solves Nushell deep call stack limitations
• Business Logic Preservation: 65+ Nushell files with domain expertise maintained
• REST API Integration: Modern HTTP endpoints for external system integration
• State Management: Checkpoint-based recovery with comprehensive rollback

⚙️ Configuration System (v2.0.0)

• Configuration Migration: Systematic migration from ENV variables to configuration files
• Hierarchical Configuration: Complete configuration flexibility with clear precedence
• Variable Interpolation: Dynamic configuration with runtime variable resolution
• PAP Compliance: True Infrastructure as Code without hardcoded fallbacks

Reading Guide

For New Developers

1. Start with System Overview for high-level understanding
2. Read Design Principles to understand architectural philosophy
3. Review relevant ADRs for specific architectural decisions
4. Study Integration Patterns for implementation details

For Architects and Senior Developers

1. Review all ADRs to understand decision rationale and trade-offs
2. Study Integration Patterns for advanced implementation patterns
3. Reference Design Principles for architectural guidelines
4. Use System Overview for comprehensive system understanding

For System Operators

1. Focus on System Overview for deployment and operation insights
2. Review ADR-002: Distribution Strategy for deployment patterns
3. Study ADR-003: Workspace Isolation for user management
4. Reference Design Principles for operational guidelines

Document Evolution

These architecture documents are living resources that evolve with the system:

• ADRs are immutable once accepted, with new ADRs created for major changes
• System documentation is updated to reflect current architecture
• Cross-references are maintained between related documents
• Version compatibility is documented for architectural changes

Contributing to Architecture Documentation

When making significant architectural changes:

1. Create new ADRs for major decisions using the standard format
2. Update system documentation to reflect architectural changes
3. Maintain cross-references between related documents
4. Document trade-offs and alternatives considered
5. Update integration patterns for new architectural patterns

Architecture Review Process

All significant architectural changes follow a review process:

1. Proposal Phase: Create draft ADR with context and proposed decision
2. Review Phase: Technical review by architecture team and stakeholders
3. Decision Phase: Accept, modify, or reject based on review feedback
4. Documentation Phase: Update related documentation and integration patterns
5. Implementation Phase: Guide implementation according to architectural decisions

This architecture documentation represents the collective wisdom and experience of building a sophisticated, production-ready infrastructure automation platform.