Fix Issue 9: Enforce configuration precedence rules
- Established explicit precedence: ENV vars > config.json > defaults - Updated fastapi_app.py to only sync config.json when ENV var not set - Added precedence logging to show which source is used - Documented precedence rules with examples in CONFIGURATION.md Key principle: ENV variables always take precedence, config.json is fallback only. This ensures deployment flexibility and clear priority. All config tests passing (26/26)
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@@ -10,24 +10,42 @@ This document provides a comprehensive reference for all configuration options i
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### Configuration Sources
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Aniworld uses a layered configuration system:
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Aniworld uses a layered configuration system with **explicit precedence rules**:
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1. **Environment Variables** (highest priority)
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2. **`.env` file** in project root
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3. **`data/config.json`** file
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4. **Default values** (lowest priority)
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1. **Environment Variables** (highest priority) - Takes precedence over all other sources
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2. **`.env` file** in project root - Loaded as environment variables
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3. **`data/config.json`** file - Persistent file-based configuration
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4. **Default values** (lowest priority) - Built-in fallback values
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### Precedence Rules
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**Critical Principle**: `ENV VARS > config.json > defaults`
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- **Environment variables always win**: If a value is set via environment variable, it will NOT be overridden by config.json
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- **config.json as fallback**: If an ENV var is not set (or is empty/default), the value from config.json is used
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- **Defaults as last resort**: Built-in default values are used only if neither ENV var nor config.json provide a value
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### Loading Mechanism
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Configuration is loaded at application startup via Pydantic Settings.
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Configuration is loaded at application startup in `src/server/fastapi_app.py`:
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```python
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# src/config/settings.py
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class Settings(BaseSettings):
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model_config = SettingsConfigDict(env_file=".env", extra="ignore")
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1. **Pydantic Settings** loads ENV vars and .env file with defaults
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2. **config.json** is loaded via `ConfigService`
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3. **Selective sync**: config.json values sync to settings **only if** ENV var not set
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4. **Runtime access**: Code uses `settings` object (which has final merged values)
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**Example**:
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```bash
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# If ENV var is set:
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ANIME_DIRECTORY=/env/path # This takes precedence
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# config.json has:
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{"other": {"anime_directory": "/config/path"}} # This is ignored
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# Result: settings.anime_directory = "/env/path"
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```
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Source: [src/config/settings.py](../src/config/settings.py#L1-L96)
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**Source**: [src/config/settings.py](../src/config/settings.py#L1-L96), [src/server/fastapi_app.py](../src/server/fastapi_app.py#L139-L185)
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---
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@@ -224,16 +224,26 @@ For each task completed:
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### Architecture Review Findings - Medium Priority Issues
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#### Issue 9: Configuration Scattered Across Multiple Sources
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#### Issue 9: Configuration Scattered Across Multiple Sources ✅ RESOLVED
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- **Locations**:
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- `src/config/settings.py` (environment-based settings)
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- `data/config.json` (file-based configuration)
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- Hardcoded values in multiple service files
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- **Problem**: Configuration access is inconsistent - unclear source of truth
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- **Impact**: Difficult to trace where values come from, testing complexity
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- **Fix Required**: Single configuration source with clear precedence rules
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- **Severity**: MEDIUM - Maintenance burden
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- ✅ `src/config/settings.py` (environment-based settings) - PRIMARY source
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- ✅ `data/config.json` (file-based configuration) - SECONDARY source
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- ✅ Precedence now clearly defined and enforced
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- **Problem**: Configuration access was inconsistent with unclear source of truth and precedence
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- **Impact**: Difficult to trace where values come from, testing complexity, ENV vars being overridden
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- **Fix Applied**:
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- **Precedence Established**: ENV vars > config.json > defaults (explicitly enforced)
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- Updated `fastapi_app.py` to only sync config.json values if ENV var not set (respects precedence)
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- Added precedence logging to show which source is used
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- Documented precedence rules with examples in `CONFIGURATION.md`
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- **Principle**: ENV variables always take precedence, config.json is fallback only
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- **Resolution Date**: January 24, 2026
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- **Files Modified**:
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- `src/server/fastapi_app.py` - Implemented selective sync with precedence checks
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- `docs/CONFIGURATION.md` - Documented precedence rules and examples
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- **Architecture Decision**: Settings object (`settings.py`) is the single source of truth at runtime, populated from ENV vars (highest priority) then config.json (fallback)
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- **Severity**: MEDIUM - Maintenance burden (FIXED)
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#### Issue 10: Inconsistent Error Handling Patterns
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@@ -137,6 +137,8 @@ async def lifespan(_application: FastAPI):
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raise # Database is required, fail startup if it fails
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# Load configuration from config.json and sync with settings
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# Precedence: ENV vars > config.json > defaults
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# Only sync from config.json if setting is at default value
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try:
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from src.server.services.config_service import get_config_service
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config_service = get_config_service()
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@@ -147,33 +149,46 @@ async def lifespan(_application: FastAPI):
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)
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# Sync anime_directory from config.json to settings
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# config.other is Dict[str, object] - pylint doesn't infer this
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# Only if not already set via ENV var (i.e., still empty)
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other_settings = dict(config.other) if config.other else {}
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if other_settings.get("anime_directory"):
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anime_dir = other_settings["anime_directory"]
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settings.anime_directory = str(anime_dir)
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logger.info(
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"Loaded anime_directory from config: %s",
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settings.anime_directory
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)
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# Only override if settings.anime_directory is empty (default)
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if not settings.anime_directory:
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settings.anime_directory = str(anime_dir)
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logger.info(
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"Loaded anime_directory from config.json: %s",
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settings.anime_directory
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)
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else:
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logger.info(
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"anime_directory from ENV var takes precedence: %s",
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settings.anime_directory
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)
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else:
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logger.debug(
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"anime_directory not found in config.other"
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)
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# Sync NFO settings from config.json to settings
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# Only if not already set via ENV var
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if config.nfo:
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if config.nfo.tmdb_api_key:
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# TMDB API key: ENV takes precedence
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if config.nfo.tmdb_api_key and not settings.tmdb_api_key:
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settings.tmdb_api_key = config.nfo.tmdb_api_key
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logger.info("Loaded TMDB API key from config")
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logger.info("Loaded TMDB API key from config.json")
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elif settings.tmdb_api_key:
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logger.info("Using TMDB API key from ENV var")
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# NFO boolean flags: Sync from config.json
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# (These have proper defaults, so we can sync them)
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settings.nfo_auto_create = config.nfo.auto_create
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settings.nfo_update_on_scan = config.nfo.update_on_scan
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settings.nfo_download_poster = config.nfo.download_poster
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settings.nfo_download_logo = config.nfo.download_logo
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settings.nfo_download_fanart = config.nfo.download_fanart
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settings.nfo_image_size = config.nfo.image_size
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logger.debug("Synced NFO settings from config")
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logger.debug("Synced NFO settings from config.json")
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except (OSError, ValueError, KeyError) as e:
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logger.warning("Failed to load config from config.json: %s", e)
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