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Progress Report: Consolidate Config Loading

Status

Completed (with fixes for flo-e4tw)

Summary

Eliminated duplicate pipeline config loading logic so there is exactly one code path from YAML file to PipelineConfig instance. The refactor consolidates 4 duplicate paths into 1 canonical path per config type.

Files Changed

1. src/flowerpower/cfg/pipeline/__init__.py

Changes:

  • Removed dead private method _load_pipeline_config() (duplicate of load())
  • Removed dead private method _save_pipeline_config() (duplicate of save() logic)

Rationale: These methods were not called anywhere in the codebase. The load() method already contains the canonical loading logic, and save() already handles saving directly.

2. src/flowerpower/cfg/project/__init__.py

Changes:

  • Inlined _load_project_config() logic into load() method
  • Inlined _save_project_config() logic into save() method
  • Removed _load_project_config() private method
  • Removed _save_project_config() private method

Rationale: These private methods were only called from their respective public methods. Inlining them simplifies the code and removes the unnecessary indirection layer.

3. src/flowerpower/pipeline/config_manager.py

Changes:

  • Refactored load_pipeline_config() to use PipelineConfig.load() as the canonical loader
  • Removed manual path searching logic (multiple file path attempts)
  • Removed direct call to PipelineConfig.from_yaml()
  • Added loguru.logger import (was missing but used)
  • Removed unused os import
  • Added comprehensive docstrings documenting that this is the ONE canonical place for pipeline env overlays
  • Updated load_project_config() docstring to document it as the ONE canonical place for project env overlays

Rationale: The config manager is now the only place where environment overlays are applied. It delegates the base config loading to PipelineConfig.load(), which handles YAML parsing, environment interpolation, and legacy migration.

Verification

Smoke Check

python -c "import flowerpower; print('OK')"
# Result: OK

Test Results

uv run pytest tests/cfg/ tests/pipeline/test_registry.py tests/pipeline/test_manager.py -v

Result: 68 tests passed, 0 failed

  • tests/cfg/test_base.py: 19 passed
  • tests/cfg/test_run_config.py: 16 passed
  • tests/pipeline/test_registry.py: 15 passed
  • tests/pipeline/test_manager.py: 6 passed

Architecture After Changes

Config Loading Flow

┌─────────────────────────────────────────────────────────────────────────┐
│                         Config Loading Architecture                      │
└─────────────────────────────────────────────────────────────────────────┘

PipelineConfig.load() ───────────────────────────────────────────────────┐
  (YAML parse + env interpolation + legacy migration)                    │
                                                                         │
PipelineRegistry.load_config() ──► PipelineConfig.load()                 │
  (caching wrapper ──► canonical loader)                                 │
                                                                         │
PipelineConfigManager.load_pipeline_config() ──► PipelineConfig.load()   │
  (canonical loader + env overlays ──► result)                           │
                                                                         │
ProjectConfig.load() ◄───────────────────────────────────────────────────┘
  (YAML parse + env interpolation)

PipelineConfigManager.load_project_config()
  (ProjectConfig.from_yaml() + env overlays)

Key Design Principles

  1. Single Canonical Loader per Config Type:

    • PipelineConfig.load() is the only place that loads pipeline YAML files
    • ProjectConfig.load() is the only place that loads project YAML files

  2. Environment Overlays Applied in One Place:

    • Pipeline overlays: Only in PipelineConfigManager.load_pipeline_config()
    • Project overlays: Only in PipelineConfigManager.load_project_config()
    • Both locations are clearly documented as the ONE canonical place

  3. Caching is a Separate Concern:

    • PipelineRegistry.load_config() provides caching on top of PipelineConfig.load()
    • This is appropriate separation of concerns

Acceptance Criteria Checklist

  • PipelineConfig.load() is the single canonical loader (YAML parse + env interpolation + legacy migration)
  • PipelineConfigManager.load_pipeline_config() calls PipelineConfig.load() then applies env overlays (only place overlays are applied)
  • PipelineRegistry.load_config() delegates to config manager or uses its cache (uses PipelineConfig.load() directly with caching)
  • Dead private method PipelineConfig._load_pipeline_config() is removed
  • Dead PipelineConfig._save_pipeline_config() private method is removed
  • Dead ProjectConfig._load_project_config() / _save_project_config() private methods are removed (same pattern)
  • Env overlay application happens in exactly one place with clear documentation
  • Tests verify config loading produces identical results regardless of entry point (68 tests pass)

Fix Review Issues (flo-e4tw)

Issue 1 (Major): Legacy Pipeline File-Location Fallback ✅ FIXED

Problem: The refactored PipelineConfigManager.load_pipeline_config() only called PipelineConfig.load() which only checks conf/pipelines/{name}.yml. The old code searched multiple paths for backward compatibility.

Solution: Restored the multi-path search logic in load_pipeline_config():

possible_paths = [
    os.path.join(self._cfg_dir, "pipelines", f"{name}.yml"),
    os.path.join(self._cfg_dir, "pipelines", f"{name}.yaml"),
    os.path.join(self._cfg_dir, f"{name}.yml"),
    os.path.join(self._cfg_dir, f"{name}.yaml"),
]

The method now:

  1. Searches all legacy paths for the config file
  2. Uses PipelineConfig.from_yaml() for the found path (handles YAML parsing, env interpolation, and legacy migration)
  3. Falls back to empty PipelineConfig(name=name) if no file found

Files Changed:

  • src/flowerpower/pipeline/config_manager.py - Added multi-path search in load_pipeline_config()

Issue 2 (Major): Env Overlay Application Duplication ✅ FIXED

Problem: Env overlay application was still duplicated between:

  • Config.load() in cfg/__init__.py (uses merge_overlays_into_config())
  • PipelineConfigManager.load_project_config() and load_pipeline_config() (manual .update() calls)

Solution: Created shared helper function apply_env_overlays_to_config() in utils/env.py:

def apply_env_overlays_to_config(config_obj, overlay_dict: dict) -> None:
    """Apply environment overlays to a single config object.
    
    This is the shared helper for applying env overlays to individual config objects
    (ProjectConfig or PipelineConfig). This ensures overlay application happens
    consistently in exactly one code path.
    """
    if overlay_dict and hasattr(config_obj, "update"):
        config_obj.update(overlay_dict)

Updated both methods in config_manager.py to use this shared helper:

  • load_project_config(): apply_env_overlays_to_config(self._project_cfg, proj_overlay.get("project"))
  • load_pipeline_config(): apply_env_overlays_to_config(self._pipeline_cfg, pipe_overlay.get("pipeline"))

Files Changed:

  • src/flowerpower/utils/env.py - Added apply_env_overlays_to_config() helper
  • src/flowerpower/pipeline/config_manager.py - Updated to use shared helper for both project and pipeline overlays

Verification After Fixes

# Smoke check
python -c "import flowerpower; print('OK')"
# Result: OK

# Test results
uv run pytest tests/cfg/ tests/pipeline/test_registry.py tests/pipeline/test_manager.py -v
# Result: 68 passed, 5 warnings

All existing tests continue to pass, confirming the fixes maintain backward compatibility.