564faaa479
- Add lab/ module structure (core, machines, deployment, monitoring) - Add mcp/ server stub for future MCP integration - Update main.scm to use new modular architecture - Fix utils/config.scm to export get-current-config function - Create comprehensive test suite with all modules passing - Update TODO.md with completed high priority tasks Key improvements: - Modular design following K.I.S.S principles - Working CLI interface for status, machines, deploy commands - Infrastructure status checking functional - All module tests passing - Clean separation of pure/impure functions CLI now works: ./main.scm status, ./main.scm machines, ./main.scm deploy <machine>
119 lines
4 KiB
Markdown
119 lines
4 KiB
Markdown
# K.I.S.S Refactoring Summary
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## Applied Principles
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### 1. Modularization (Keep It Simple, Keep It Small)
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- **Before**: Large monolithic modules (138+ lines)
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- **After**: Small focused modules (each under 50 lines)
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- **Example**: SSH module split into 5 specialized modules
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### 2. Single Responsibility Principle (UNIX Philosophy: Do One Thing Well)
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- **connection-test.scm**: Only SSH connectivity testing
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- **remote-command.scm**: Only remote command execution
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- **file-copy.scm**: Only file transfer operations
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- **retry.scm**: Only retry logic
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- **context.scm**: Only connection context management
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### 3. Functional Programming Patterns
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- **Pure Functions First**: All core logic implemented as pure functions
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- **Immutable Data**: Configuration and data structures remain immutable
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- **Separation of Concerns**: Pure functions separated from side effects
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### 4. Function-Level Modularity
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Each module exports both:
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- **Pure functions**: For testing, composition, and functional programming
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- **Impure wrappers**: For convenience and logging
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## Module Structure
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```
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utils/
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├── ssh/
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│ ├── connection-test.scm # Pure SSH connectivity testing
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│ ├── remote-command.scm # Pure command execution logic
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│ ├── file-copy.scm # Pure file transfer operations
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│ ├── retry.scm # Pure retry logic with backoff
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│ └── context.scm # Connection context management
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├── config/
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│ ├── defaults.scm # Pure data: default configuration
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│ ├── loader.scm # File I/O operations
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│ ├── accessor.scm # Pure configuration access functions
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│ └── state.scm # Mutable state management
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├── logging/
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│ ├── format.scm # Pure formatting and color codes
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│ ├── level.scm # Pure log level management
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│ ├── state.scm # Mutable log level state
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│ ├── output.scm # Pure output formatting
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│ ├── core.scm # Main logging functions
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│ └── spinner.scm # Progress indication
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└── json/
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├── parse.scm # Pure JSON parsing
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├── serialize.scm # Pure JSON serialization
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├── file-io.scm # File I/O with pure/impure versions
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├── validation.scm # Pure schema validation
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├── manipulation.scm # Pure object manipulation
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└── pretty-print.scm # Output formatting
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```
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## Benefits Achieved
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### 1. Testability
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- Pure functions can be tested in isolation
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- No side effects to mock or manage
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- Clear input/output contracts
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### 2. Composability
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- Small functions can be easily combined
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- Pure functions enable functional composition
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- Reusable building blocks
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### 3. Maintainability
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- Single responsibility makes modules easy to understand
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- Changes are localized to specific modules
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- Clear separation between pure and impure code
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### 4. Code Reuse
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- Pure functions can be reused across different contexts
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- Both pure and impure versions available
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- Facade modules provide convenient interfaces
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## Usage Examples
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### Pure Function Composition
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```scheme
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;; Test connection and get config in one go
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(let ((ssh-config (get-ssh-config-pure config "machine-name")))
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(if (test-ssh-connection-pure ssh-config)
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(run-remote-command-pure ssh-config "uptime" '())
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#f))
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```
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### Convenient Impure Wrappers
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```scheme
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;; Same operation with logging and error handling
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(with-ssh-connection "machine-name"
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(lambda () (run-remote-command "machine-name" "uptime")))
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```
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### Functional Pipeline
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```scheme
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;; Pure validation pipeline
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(let* ((config (load-config-from-file "config.json"))
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(valid? (validate-json-schema config machine-schema))
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(machines (if valid? (get-all-machines-pure config) '())))
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machines)
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```
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This refactoring transforms the codebase from monolithic modules into a collection of small, focused, composable functions that follow functional programming principles while maintaining practical usability.
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