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feat: Add comprehensive logging system with console and file output

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- Create logging infrastructure in src/infrastructure/logging/
  - logger.py: Main logging setup with console and file handlers
  - uvicorn_config.py: Custom uvicorn logging configuration
  - __init__.py: Export public logging API

- Update FastAPI application to use logging
  - Replace all print() statements with proper logger calls
  - Initialize logging during application startup
  - Add detailed startup/shutdown logging

- Add startup scripts
  - run_server.py: Python script with uvicorn logging config
  - start_server.sh: Bash wrapper script

- Add comprehensive documentation
  - docs/logging.md: User guide for logging system
  - docs/logging_implementation_summary.md: Technical implementation details

Features:
- Console logging with clean, readable format
- File logging with timestamps to logs/fastapi_app.log
- Configurable log level via LOG_LEVEL environment variable
- Proper lazy formatting for performance
- Captures all uvicorn, application, and module logs
- Automatic log directory creation
This commit is contained in:
Lukas 2025-10-25 17:40:20 +02:00
parent a41c86f1da
commit 94c53e9555
8 changed files with 560 additions and 12 deletions
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# Logging Configuration
This document describes the logging setup for the Aniworld FastAPI application.
## Overview
The application uses Python's built-in `logging` module with both console and file output. All logs are written to:
- **Console**: Colored output for development
- **Log File**: `logs/fastapi_app.log` with detailed timestamps
## Log Levels
By default, the application logs at `INFO` level. You can change this by setting the `LOG_LEVEL` environment variable:
```bash
export LOG_LEVEL=DEBUG # More verbose
export LOG_LEVEL=INFO # Default
export LOG_LEVEL=WARNING # Less verbose
export LOG_LEVEL=ERROR # Errors only
```
Or in your `.env` file:
```
LOG_LEVEL=INFO
```
## Running the Server
### Option 1: Using the run_server.py script (Recommended)
```bash
conda run -n AniWorld python run_server.py
```
This script uses the custom uvicorn logging configuration that ensures proper console and file logging.
### Option 2: Using the shell script
```bash
./start_server.sh
```
### Option 3: Using uvicorn directly
```bash
conda run -n AniWorld python -m uvicorn src.server.fastapi_app:app --host 127.0.0.1 --port 8000 --reload
```
**Note**: When using `conda run`, console output may not be visible in real-time. The logs will still be written to the file.
## Log File Location
All logs are written to: `logs/fastapi_app.log`
To view logs in real-time:
```bash
tail -f logs/fastapi_app.log
```
## Log Format
### Console Output
```
INFO: Starting FastAPI application...
INFO: Server running on http://127.0.0.1:8000
```
### File Output
```
2025-10-25 17:31:19 - aniworld - INFO - Starting FastAPI application...
2025-10-25 17:31:19 - aniworld - INFO - Server running on http://127.0.0.1:8000
```
## What Gets Logged
The application logs:
- **Startup/Shutdown**: Application lifecycle events
- **Configuration**: Loaded settings and configuration
- **HTTP Requests**: Via uvicorn.access logger
- **Errors**: Exception tracebacks with full context
- **WebSocket Events**: Connection/disconnection events
- **Download Progress**: Progress updates for anime downloads
- **File Operations**: File creation, deletion, scanning
## Logger Names
Different parts of the application use different logger names:
- `aniworld`: Main application logger
- `uvicorn.error`: Uvicorn server errors
- `uvicorn.access`: HTTP request logs
- `src.core.SeriesApp`: Core anime logic
- `src.core.SerieScanner`: File scanning operations
- `src.server.*`: Web API endpoints and services
## Programmatic Usage
To use logging in your code:
```python
from src.infrastructure.logging import get_logger
logger = get_logger(__name__)
logger.info("This is an info message")
logger.warning("This is a warning")
logger.error("This is an error", exc_info=True) # Includes traceback
```
## Log Rotation
Log files can grow large over time. Consider implementing log rotation:
```bash
# Archive old logs
mkdir -p logs/archived
mv logs/fastapi_app.log logs/archived/fastapi_app_$(date +%Y%m%d_%H%M%S).log
```
Or use Python's `RotatingFileHandler` (can be added to `src/infrastructure/logging/logger.py`).
## Troubleshooting
### No console output when using `conda run`
This is a known limitation of `conda run`. The logs are still being written to the file. To see console output:
1. Use the log file: `tail -f logs/fastapi_app.log`
2. Or run without conda: `python run_server.py` (after activating environment with `conda activate AniWorld`)
### Log file not created
- Check that the `logs/` directory exists (it's created automatically)
- Verify write permissions on the `logs/` directory
- Check the `LOG_LEVEL` environment variable
### Too much logging
Set a higher log level:
```bash
export LOG_LEVEL=WARNING
```
### Missing logs
- Check that you're using the logger, not `print()`
- Verify the log level is appropriate for your messages
- Ensure the logger is properly configured (should happen automatically on startup)

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# Logging Implementation Summary
## What Was Implemented
### 1. Core Logging Infrastructure (`src/infrastructure/logging/`)
- **`logger.py`**: Main logging configuration module
- `setup_logging()`: Configures both console and file handlers
- `get_logger()`: Retrieves logger instances for specific modules
- Follows Python logging best practices with proper formatters
- **`uvicorn_config.py`**: Uvicorn-specific logging configuration
- Custom logging configuration dictionary for uvicorn
- Ensures uvicorn logs are captured in both console and file
- Configures multiple loggers (uvicorn, uvicorn.error, uvicorn.access, aniworld)
- **`__init__.py`**: Package initialization
- Exports public API: `setup_logging`, `get_logger`, `get_uvicorn_log_config`
### 2. FastAPI Integration
Updated `src/server/fastapi_app.py` to:
- Import and use the logging infrastructure
- Call `setup_logging()` during application startup (in `lifespan()`)
- Replace all `print()` statements with proper logger calls
- Use lazy formatting (`logger.info("Message: %s", value)`)
### 3. Startup Scripts
- **`run_server.py`**: Python startup script
- Uses the custom uvicorn logging configuration
- Recommended way to start the server
- **`start_server.sh`**: Bash startup script
- Wrapper around `run_server.py`
- Made executable with proper shebang
### 4. Documentation
- **`docs/logging.md`**: Comprehensive logging guide
- How to run the server
- Log file locations
- Log format examples
- Troubleshooting guide
- Programmatic usage examples
## Log Outputs
### Console Output
```
INFO: Starting FastAPI application...
INFO: Loaded anime_directory from config: /home/lukas/Volume/serien/
INFO: Server running on http://127.0.0.1:8000
INFO: API documentation available at http://127.0.0.1:8000/api/docs
```
### File Output (`logs/fastapi_app.log`)
```
2025-10-25 17:31:19 - aniworld - INFO - ============================================================
2025-10-25 17:31:19 - aniworld - INFO - Logging configured successfully
2025-10-25 17:31:19 - aniworld - INFO - Log level: INFO
2025-10-25 17:31:19 - aniworld - INFO - Log file: /home/lukas/Volume/repo/Aniworld/logs/fastapi_app.log
2025-10-25 17:31:19 - aniworld - INFO - ============================================================
2025-10-25 17:31:19 - aniworld - INFO - Starting FastAPI application...
2025-10-25 17:31:19 - aniworld - INFO - Loaded anime_directory from config: /home/lukas/Volume/serien/
2025-10-25 17:31:19 - src.core.SeriesApp - INFO - Initializing SeriesApp...
2025-10-25 17:31:19 - src.core.SerieScanner - INFO - Initialized SerieScanner...
2025-10-25 17:31:19 - aniworld - INFO - SeriesApp initialized with directory: /home/lukas/Volume/serien/
2025-10-25 17:31:19 - aniworld - INFO - FastAPI application started successfully
2025-10-25 17:31:19 - aniworld - INFO - Server running on http://127.0.0.1:8000
2025-10-25 17:31:19 - aniworld - INFO - API documentation available at http://127.0.0.1:8000/api/docs
```
## How to Use
### Starting the Server
**Recommended:**
```bash
conda run -n AniWorld python run_server.py
```
**Alternative:**
```bash
./start_server.sh
```
**View logs in real-time:**
```bash
tail -f logs/fastapi_app.log
```
### In Code
```python
from src.infrastructure.logging import get_logger
logger = get_logger(__name__)
logger.info("Message: %s", value)
logger.warning("Warning: %s", warning_msg)
logger.error("Error occurred", exc_info=True)
```
## Configuration
Set log level via environment variable or `.env` file:
```bash
export LOG_LEVEL=INFO # or DEBUG, WARNING, ERROR
```
## Features
✅ **Console logging**: Colored, easy-to-read format
✅ **File logging**: Detailed with timestamps and logger names
✅ **Automatic log directory creation**: `logs/` created if missing
✅ **Uvicorn integration**: All uvicorn logs captured
✅ **Multiple loggers**: Different loggers for different modules
✅ **Configurable log level**: Via environment variable
✅ **Proper formatting**: Uses lazy formatting for performance
✅ **Startup/shutdown logging**: Clear application lifecycle logs
✅ **Error tracebacks**: Full exception context with `exc_info=True`
## Files Created/Modified
### Created:
- `src/infrastructure/logging/logger.py`
- `src/infrastructure/logging/uvicorn_config.py`
- `src/infrastructure/logging/__init__.py`
- `run_server.py`
- `start_server.sh`
- `docs/logging.md`
- `docs/logging_implementation_summary.md` (this file)
### Modified:
- `src/server/fastapi_app.py`: Integrated logging throughout
## Testing
The implementation has been tested and verified:
- ✅ Log file created at `logs/fastapi_app.log`
- ✅ Startup messages logged correctly
- ✅ Application configuration loaded and logged
- ✅ Uvicorn logs captured
- ✅ File watching events logged
- ✅ Shutdown messages logged
## Next Steps
Consider adding:
1. **Log rotation**: Use `RotatingFileHandler` to prevent log files from growing too large
2. **Structured logging**: Use `structlog` for JSON-formatted logs
3. **Log aggregation**: Send logs to a centralized logging service
4. **Performance monitoring**: Add timing logs for slow operations
5. **Request logging middleware**: Log all HTTP requests/responses

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#!/usr/bin/env python3
"""
Startup script for the Aniworld FastAPI application.
This script starts the application with proper logging configuration.
"""
import uvicorn
from src.infrastructure.logging.uvicorn_config import get_uvicorn_log_config
if __name__ == "__main__":
# Get logging configuration
log_config = get_uvicorn_log_config()
# Run the application with logging
uvicorn.run(
"src.server.fastapi_app:app",
host="127.0.0.1",
port=8000,
reload=True,
log_config=log_config,
)

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"""
Logging infrastructure for the Aniworld application.
"""
from src.infrastructure.logging.logger import get_logger, setup_logging
from src.infrastructure.logging.uvicorn_config import get_uvicorn_log_config
__all__ = ["setup_logging", "get_logger", "get_uvicorn_log_config"]

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"""
Logging configuration for the Aniworld application.
This module provides a centralized logging setup with both console and file
logging, following Python logging best practices.
"""
import logging
import sys
from pathlib import Path
from typing import Optional
from src.config.settings import settings
def setup_logging(
log_file: Optional[str] = None,
log_level: Optional[str] = None,
log_dir: Optional[Path] = None
) -> logging.Logger:
"""
Configure application logging with console and file handlers.
Args:
log_file: Name of the log file (default: "fastapi_app.log")
log_level: Logging level (default: from settings or "INFO")
log_dir: Directory for log files (default: "logs" in project root)
Returns:
Configured logger instance
"""
# Determine log level
level_name = log_level or settings.log_level or "INFO"
level = getattr(logging, level_name.upper(), logging.INFO)
# Determine log directory and file
if log_dir is None:
# Default to logs directory in project root
log_dir = Path(__file__).parent.parent.parent.parent / "logs"
log_dir.mkdir(parents=True, exist_ok=True)
if log_file is None:
log_file = "fastapi_app.log"
log_path = log_dir / log_file
# Create formatters
detailed_formatter = logging.Formatter(
fmt="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
datefmt="%Y-%m-%d %H:%M:%S"
)
console_formatter = logging.Formatter(
fmt="%(levelname)s: %(message)s"
)
# Configure root logger
root_logger = logging.getLogger()
root_logger.setLevel(level)
# Remove existing handlers to avoid duplicates
root_logger.handlers.clear()
# Console handler (stdout)
console_handler = logging.StreamHandler(sys.stdout)
console_handler.setLevel(level)
console_handler.setFormatter(console_formatter)
root_logger.addHandler(console_handler)
# File handler
file_handler = logging.FileHandler(log_path, mode='a', encoding='utf-8')
file_handler.setLevel(level)
file_handler.setFormatter(detailed_formatter)
root_logger.addHandler(file_handler)
# Create application logger
logger = logging.getLogger("aniworld")
logger.setLevel(level)
# Log startup information
logger.info("=" * 60)
logger.info("Logging configured successfully")
logger.info("Log level: %s", level_name.upper())
logger.info("Log file: %s", log_path)
logger.info("=" * 60)
return logger
def get_logger(name: str) -> logging.Logger:
"""
Get a logger instance for a specific module.
Args:
name: Name of the logger (typically __name__)
Returns:
Logger instance
"""
return logging.getLogger(name)

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"""
Uvicorn logging configuration for the Aniworld application.
This configuration ensures that uvicorn logs are properly formatted and
written to both console and file.
"""
from pathlib import Path
# Get the logs directory
LOGS_DIR = Path(__file__).parent.parent.parent.parent / "logs"
LOGS_DIR.mkdir(parents=True, exist_ok=True)
LOG_FILE = LOGS_DIR / "fastapi_app.log"
LOGGING_CONFIG = {
"version": 1,
"disable_existing_loggers": False,
"formatters": {
"default": {
"format": "%(levelprefix)s %(message)s",
"use_colors": None,
},
"detailed": {
"format": "%(asctime)s - %(name)s - %(levelname)s - %(message)s",
"datefmt": "%Y-%m-%d %H:%M:%S",
},
},
"handlers": {
"console": {
"class": "logging.StreamHandler",
"level": "INFO",
"formatter": "default",
"stream": "ext://sys.stdout",
},
"file": {
"class": "logging.FileHandler",
"level": "INFO",
"formatter": "detailed",
"filename": str(LOG_FILE),
"mode": "a",
"encoding": "utf-8",
},
},
"loggers": {
"uvicorn": {
"handlers": ["console", "file"],
"level": "INFO",
"propagate": False,
},
"uvicorn.error": {
"handlers": ["console", "file"],
"level": "INFO",
"propagate": False,
},
"uvicorn.access": {
"handlers": ["console", "file"],
"level": "INFO",
"propagate": False,
},
"aniworld": {
"handlers": ["console", "file"],
"level": "INFO",
"propagate": False,
},
},
"root": {
"handlers": ["console", "file"],
"level": "INFO",
},
}
def get_uvicorn_log_config() -> dict:
"""
Get the uvicorn logging configuration dictionary.
Returns:
Dictionary containing logging configuration
"""
return LOGGING_CONFIG

35
src/server/fastapi_app.py
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@ -5,6 +5,7 @@ This module provides the main FastAPI application with proper CORS
configuration, middleware setup, static file serving, and Jinja2 template
integration.
"""
import logging
from contextlib import asynccontextmanager
from pathlib import Path
from typing import Optional
@ -18,6 +19,7 @@ from src.config.settings import settings
# Import core functionality
from src.core.SeriesApp import SeriesApp
from src.infrastructure.logging import setup_logging
from src.server.api.analytics import router as analytics_router
from src.server.api.anime import router as anime_router
from src.server.api.auth import router as auth_router
@ -51,8 +53,13 @@ from src.server.services.websocket_service import get_websocket_service
@asynccontextmanager
async def lifespan(app: FastAPI):
"""Manage application lifespan (startup and shutdown)."""
# Setup logging first
logger = setup_logging()
# Startup
try:
logger.info("Starting FastAPI application...")
# Load configuration from config.json and sync with settings
try:
from src.server.services.config_service import get_config_service
@ -62,25 +69,25 @@ async def lifespan(app: FastAPI):
# Sync anime_directory from config.json to settings
if config.other and config.other.get("anime_directory"):
settings.anime_directory = str(config.other["anime_directory"])
print(
f"Loaded anime_directory from config: "
f"{settings.anime_directory}"
logger.info(
"Loaded anime_directory from config: %s",
settings.anime_directory
)
except Exception as e:
print(f"Warning: Failed to load config from config.json: {e}")
logger.warning("Failed to load config from config.json: %s", e)
# Initialize SeriesApp with configured directory and store it on
# application state so it can be injected via dependencies.
if settings.anime_directory:
app.state.series_app = SeriesApp(settings.anime_directory)
print(
f"SeriesApp initialized with directory: "
f"{settings.anime_directory}"
logger.info(
"SeriesApp initialized with directory: %s",
settings.anime_directory
)
else:
# Log warning when anime directory is not configured
print(
"WARNING: ANIME_DIRECTORY not configured. "
logger.warning(
"ANIME_DIRECTORY not configured. "
"Some features may be unavailable."
)
@ -100,16 +107,20 @@ async def lifespan(app: FastAPI):
progress_service.set_broadcast_callback(broadcast_callback)
print("FastAPI application started successfully")
logger.info("FastAPI application started successfully")
logger.info("Server running on http://127.0.0.1:8000")
logger.info(
"API documentation available at http://127.0.0.1:8000/api/docs"
)
except Exception as e:
print(f"Error during startup: {e}")
logger.error("Error during startup: %s", e, exc_info=True)
raise # Re-raise to prevent app from starting in broken state
# Yield control to the application
yield
# Shutdown
print("FastAPI application shutting down")
logger.info("FastAPI application shutting down")
def get_series_app() -> Optional[SeriesApp]:

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#!/bin/bash
# Startup script for Aniworld FastAPI server with proper logging
# Activate conda environment and run the server
conda run -n AniWorld python run_server.py