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Refactor: Extract service layer from template command #112
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Introduce foundational components for the refactoring: - **DI Container** (core/di.py): Request-scoped dependency injection - Type-safe registration and resolution - Hierarchical scoping with parent containers - Replaces global singleton pattern - 11 comprehensive tests - **Structured Errors** (core/errors.py): Base NylError class - Rich terminal formatting with hints - Cause tracking and context details - Replaces scattered exit(1) calls - 10 comprehensive tests **Benefits:** - Testable architecture without global state - Better error messages with actionable guidance - Foundation for extracting business logic from commands **Tests:** 21 passing tests for core infrastructure 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
Add models package with execution contexts and specific errors: - **ExecutionContext** (models/context.py): - Base context for command execution - TemplateContext with template-specific fields - Manages state dirs and cache dirs - **Error Types** (models/errors.py): - ManifestValidationError - ProfileNotFoundError - NamespaceAmbiguityError - ApplySetError - KubernetesOperationError - ConfigurationError - **Dependencies** (pyproject.toml): - Add rich>=13.7.0 for terminal UI **Benefits:** - Type-safe context passing (no more global state) - Specific error types with helpful hints - Better error handling throughout application 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
Extract file loading and namespace resolution from template.py: **ManifestLoaderService** (services/manifest.py): - load_manifests(): Load files with filtering (lines 414-493 from template.py) - extract_local_variables(): Extract $-prefixed variables - validate_manifest_structure(): Validate Kubernetes resources - 17 comprehensive tests **NamespaceResolverService** (services/namespace.py): - resolve_default_namespace(): Smart resolution with 4 strategies (lines 504-576 from template.py) - populate_namespaces(): Fill default namespaces - find_namespace_resources(): Find namespace resources - 16 comprehensive tests **Benefits:** - 150+ lines extracted from 577-line template.py - Independently testable business logic - Eliminates code duplication - Better error messages with structured errors **Tests:** 33 new tests (50 total with Phase 1) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
Complete the service layer with orchestration services: **TemplatingService** (services/templating.py): - evaluate_template(): Orchestrate template evaluation (lines 269-288 from template.py) - _generate_inline_resources(): Parallel inline resource generation - Handles ThreadPoolExecutor management **ProfileService** (services/profile.py): - resolve_profile(): Unified profile/kubeconfig resolution - Consolidates duplicate logic from run.py:47-91 and template.py:156-194 - _resolve_from_kubeconfig(): Fallback to kubeconfig contexts - get_api_client(): Create Kubernetes API client **KubernetesApplyService** (services/kubernetes_apply.py): - find_or_create_applyset(): ApplySet discovery and auto-generation (lines 292-343 from template.py) - prepare_applyset(): Validation and setup - apply_with_applyset(): Apply resources with ApplySet support - diff_with_applyset(): Diff against cluster - output_yaml(): Dry-run mode - 17 comprehensive tests **Benefits:** - ~450 lines total extracted from template.py - ~50 lines of duplicate code eliminated (run.py + template.py) - All kubectl + ApplySet logic centralized - Profile resolution no longer duplicated **Tests:** 71 total tests passing (21 Phase 1 + 33 Phase 2 + 17 Phase 3) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
Replace the standalone load_manifests() function with ManifestLoaderService: - Updated template.py to use ManifestLoaderService for loading manifests - Replaced manual local variable extraction with service method - Updated add.py imports to use ManifestLoaderService - Removed ~80 lines of duplicate logic from template.py This reduces the template command from 577 lines and extracts reusable manifest loading logic into a testable service. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
Replace namespace resolution logic with NamespaceResolverService: - Use resolve_default_namespace() instead of get_default_namespace_for_manifest() - Use populate_namespaces() instead of populate_namespace_to_resources() - Removed ~73 lines of duplicate namespace resolution logic This extraction makes the namespace resolution strategy testable and reusable. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
Replace ApplySet management and kubectl operations with KubernetesApplyService: - Use find_or_create_applyset() to find/generate ApplySets - Use prepare_applyset() to configure ApplySets - Use tag_resources_with_applyset() to add part-of labels - Use apply_with_applyset(), diff_with_applyset(), output_yaml() for kubectl operations - Removed ~45 lines of ApplySet and kubectl logic This consolidates all ApplySet lifecycle management into a testable service. Template command reduced from 400 to 356 lines (11% reduction). Overall reduction from 577 to 356 lines (38% reduction from start). 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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Pull request overview
This PR successfully refactors the Nyl CLI by extracting business logic from the monolithic template.py command into well-structured, testable services. The refactoring reduces template.py from 577 lines to 356 lines while adding comprehensive test coverage for the extracted functionality.
Key Changes
- Core Infrastructure: Introduces request-scoped dependency injection (
DIContainer) and structured error handling (NylErrorhierarchy) to replace global state and scatteredexit(1)calls - Service Layer: Extracts five domain services (ManifestLoader, NamespaceResolver, KubernetesApply, Profile, Templating) with clear responsibilities and comprehensive test coverage (87 tests, 50 new)
- Domain Models: Adds execution context models and specific error types for better error messages with hints and details
Reviewed changes
Copilot reviewed 20 out of 21 changed files in this pull request and generated 14 comments.
Show a summary per file
| File | Description |
|---|---|
src/nyl/core/di.py |
Request-scoped dependency injection container with hierarchical scoping |
src/nyl/core/errors.py |
Base error class with rich formatting support |
src/nyl/models/context.py |
Execution context models for command configuration |
src/nyl/models/errors.py |
Specific error types for common failure scenarios |
src/nyl/services/manifest.py |
Service for loading and validating manifest files |
src/nyl/services/namespace.py |
Service for namespace resolution with 4 fallback strategies |
src/nyl/services/kubernetes_apply.py |
Service for ApplySet management and kubectl operations |
src/nyl/services/profile.py |
Service for profile resolution and kubeconfig management |
src/nyl/services/templating.py |
Service for template evaluation and inline resource generation |
src/nyl/commands/template.py |
Refactored to use new service layer (38% reduction) |
src/nyl/commands/add.py |
Updated to use ManifestLoaderService |
pyproject.toml |
Added rich library dependency for error formatting |
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Fix all issues identified in the code review: 1. ProfileService resource leak: Made ActivatedProfile a context manager to properly manage TemporaryDirectory lifecycle 2. Missing force_conflicts parameter: Added force_conflicts=True to resource apply operations to maintain original behavior 3. Invalid type hint: Changed lowercase 'any' to 'Any' from typing module 4. Simplified lambda expressions: Replaced unnecessary lambda wrappers with direct class references in DI tests 5. ApplySet diff type error: Pass ApplySet object instead of reference string to kubectl.diff() All tests pass and type checking is clean. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
Replace inline template evaluation and resource generation logic with TemplatingService: - Created TemplatingService instance with template_engine, generator, and namespace_resolver - Replaced 20 lines of template evaluation and inline generation code with single call to templating_service.evaluate_template() - Removed no longer needed imports: Future, ThreadPoolExecutor, reconcile_generator, ResourceList Benefits: - Further reduces template.py from 356 to 338 lines (5% reduction) - Consolidates template orchestration logic into testable service - Eliminates code duplication between template evaluation passes - Simplifies template command implementation All service tests pass and type checking is clean. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
Replace manual profile/kubeconfig resolution logic with ProfileService: - Removed 45 lines of duplicate profile resolution logic - Replaced with single call to profile_service.resolve_profile() - Uses ActivatedProfile as context manager for proper cleanup - Maintains all original behavior including --inherit-kubeconfig support - Better error messages via ProfileNotFoundError Changes: - Removed imports: atexit, Path, TemporaryDirectory, ActivatedProfile, _trim_to_context, yaml - Added import: ProfileService - Simplified run() function from 54 lines to 23 lines (57% reduction) The ProfileService encapsulates the complex profile resolution logic that was previously duplicated between run.py and template.py, making the code more maintainable and testable. All linting and type checking passes. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
Add explicit type casts to resolve mypy 'no-any-return' errors: - Cast namespace name lookups from Resource dictionaries to str - Import cast from typing module - Fixes errors on lines 63, 85, and 98 All namespace tests pass and type checking is clean. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
- Remove redundant cast in namespace.py (line 100) - Add type parameters to dict in profile.py _trim_to_context() - Import Any in profile.py All production code now passes type checking. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
Add comprehensive type annotations to all test files: - Add return type annotations (-> None or specific types for fixtures) - Add parameter type annotations for all test functions and fixtures - Fix StringIO.getvalue() errors by casting console.file to StringIO - Add null check before 'in' operator on optional hint field - Import necessary types (Generator, Mock, cast) Test files fixed: - core/di_test.py: All test functions annotated - core/errors_test.py: Fixed IO[str] getvalue() errors with cast - services/kubernetes_apply_test.py: Added fixture and parameter types - services/manifest_test.py: Fixed Generator return type for fixture - services/namespace_test.py: Added service parameter types All 71 tests pass and type checking is clean across entire codebase. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
Removed 22 tests that don't add significant value: Deleted files: - core/errors_test.py (10 tests) - Testing error formatting details Removed from manifest_test.py (5 tests): - test_load_manifests_skips_nyl_prefixed_files - test_load_manifests_skips_hidden_files - test_load_manifests_skips_underscore_files - test_load_manifests_only_loads_yaml_files - test_load_manifests_empty_directory_returns_empty_list Removed from namespace_test.py (5 tests): - test_is_namespace_resource_true_for_namespace - test_is_namespace_resource_false_for_other_kinds - test_is_namespace_resource_false_for_wrong_api_version - test_find_namespace_resources_empty_list - test_find_namespace_resources_no_namespaces Removed from kubernetes_apply_test.py (2 tests): - test_find_namespace_resources_empty - test_tag_resources_with_applyset_part_of_false Test count: 71 → 49 tests (22 removed) All remaining tests pass (49/49) These tests were testing implementation details, edge cases, and trivial helper function behavior rather than core business logic. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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Pull request overview
Copilot reviewed 21 out of 22 changed files in this pull request and generated no new comments.
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This commit completes the DI migration started in PR #112 by: - Migrating all commands to use DIContainer instead of global PROVIDER - Creating container_setup.py with setup_base_container() and setup_service_container() - Removing PROVIDER and ApiClientConfig from commands/__init__.py - Updating template.py, run.py, profile.py, new.py, tun.py, secrets.py, and tools/sops.py - Fixing pre-existing typos in LOG_TIME_FORMAT and LOG_LEVEL_FORMAT The old tools/di.py is kept for backward compatibility with secrets/project modules. All tests passing (65/65), type checks clean, no lint issues. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
This completes the architectural vision from PR #112 by integrating the ExecutionContext and TemplateContext models throughout all commands. Changes: - template.py: Uses TemplateContext to encapsulate command state - run.py, profile.py, new.py, tun.py, secrets.py: Use ExecutionContext - All commands now create context after DIContainer setup - Services accessed via context.container.resolve() for consistency - Added comprehensive developer documentation Benefits: - Cleaner command initialization with context objects - Better encapsulation of command state - More testable architecture with proper separation of concerns - Foundation for future improvements Documentation: - Created docs/content/development/dependency-injection.md - Updated PR #112 description to reflect completion Tests: All 65 tests passing, type checks clean, linter clean 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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Pull request overview
Copilot reviewed 30 out of 31 changed files in this pull request and generated 2 comments.
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src/nyl/core/container_setup.py
Outdated
| working_dir: Working directory for the command | ||
| """ | ||
| if working_dir is None: | ||
| working_dir = Path.cwd() |
Copilot
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Nov 30, 2025
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Variable working_dir is not used.
| from nyl.secrets.config import SecretsConfig | ||
|
|
||
| if TYPE_CHECKING: | ||
| from nyl.tools.kubectl import Kubectl |
Copilot
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Nov 30, 2025
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Import of 'Kubectl' is not used.
| from nyl.tools.kubectl import Kubectl |
This removes the old DependenciesProvider system completely, leaving only the new DIContainer as the single dependency injection system throughout Nyl. Changes: - Deleted src/nyl/tools/di.py (old DI system) - Updated SecretProvider.init() to accept ApiClient | None instead of DependenciesProvider - Updated all secret providers (sops, kubernetes, null) to new signature - Updated ProjectConfig.load() to accept api_client instead of dependencies - Updated SecretsConfig.load() to accept api_client instead of dependencies - Removed temporary adapter pattern from container_setup.py - Updated developer documentation to reflect completed migration - Fixed sops_test.py to use new API Benefits: - Single DI system throughout the codebase (no more dual systems) - Cleaner API - ApiClient passed directly where needed - No more adapter/bridge code - Simpler mental model for developers Tests: All 65 tests passing, type checks clean, linter clean 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
ExecutionContext was only used to access .container in most commands, adding unnecessary overhead. Commands now use container.resolve() directly instead. Changes: - Remove ExecutionContext from run.py, profile.py, new.py, tun.py, secrets.py - Remove unused _context global from secrets.py - Remove unnecessary comment from new.py - Clean up unused imports (Path, ProjectConfig) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
Improve type safety by replacing apply_mode and diff_mode booleans with a single mode field using Literal type. Changes: - Replace apply_mode/diff_mode with mode: Literal["apply", "diff"] | None - Update template.py to set mode based on apply/diff flags - Add Literal import to context.py This provides clearer semantics and prevents invalid state combinations. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
ExecutionContext is no longer needed - it was only used as a wrapper to access .container in commands. TemplateContext remains as a standalone class with genuinely useful template-specific fields. Changes: - Delete ExecutionContext class from context.py - Make TemplateContext standalone (no longer inherits from ExecutionContext) - Remove ExecutionContext export from models/__init__.py - Update module docstring to reflect template-only focus 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
Address PR review comments with minor code quality fixes. Changes: - Fix grammar in di.py docstring (replaces → replaced) - Remove unused working_dir parameter from setup_base_container() - Use kubectl.version()["gitVersion"] instead of KUBE_VERSION env var - Remove unused Path import from container_setup.py 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
Reduce documentation from 334 lines to 112 lines, focusing on essential information developers need. Changes: - Keep: DI overview, basic examples, adding commands/services - Remove: Exhaustive best practices, migration details, lengthy examples - Remove: ExecutionContext references (now deleted) - Streamline to quick reference format This addresses PR feedback that the documentation was too detailed. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
The find_namespace_resources() method was duplicated between KubernetesApplyService and NamespaceResolverService. Namespace resolution is the responsibility of NamespaceResolverService, so the duplicate method and its unused call in template.py have been removed. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
This completes the service layer extraction for Phase 4. The template command now uses TemplatingService to handle template evaluation and inline resource generation, removing the direct usage of reconcile_generator and ThreadPoolExecutor from the command layer. Changes: - Removed unused imports (Future, ThreadPoolExecutor, reconcile_generator, ResourceList) - Added TemplatingService import and integration - Replaced inline template evaluation logic with TemplatingService.evaluate_template() - Formatting applied via tire fmt Note: Pre-existing type errors remain in service layer tests and will need to be addressed in a follow-up PR. These are not introduced by this change. Next steps: Consider extracting ProfileService integration and reviewing overall architecture for any remaining refactoring opportunities. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
Summary
This PR refactors the Nyl CLI by extracting business logic from the 577-line
template.pycommand into reusable, testable services, and completes the migration from a global PROVIDER singleton to request-scoped dependency injection containers.Key Changes
Core Infrastructure:
src/nyl/core/di.py)src/nyl/core/container_setup.py)src/nyl/core/errors.py)src/nyl/models/context.py)Services Created:
ManifestLoaderService- Manifest loading, filtering, and validationNamespaceResolverService- Namespace resolution with 4 fallback strategiesKubernetesApplyService- ApplySet lifecycle management and kubectl operationsProfileService- Profile resolution and kubeconfig managementTemplatingService- Template evaluation and inline resource handlingAll Services Fully Integrated:
ProfileServiceintegrated into run commandTemplatingServiceintegrated for template evaluationTemplate Command Improvements:
TemplateContextto encapsulate command stateDependency Injection Migration:
Architecture
DIContainer:
ExecutionContext:
TemplateContext:
Backward Compatibility:
tools/di.pykept for ProjectConfig and SecretsConfigcontainer_setup.pybridge old and new systemsTest Coverage
Documentation
docs/content/development/dependency-injection.mdCode Stats
Benefits
Migration Complete
All planned work for this PR is complete:
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