feat: Move Flask application to production-grade Gunicorn WSGI server

- Add-on `dwd_global_rad_server_dev`: Migrated from Flask development server to Gunicorn WSGI server for production use.
- Updated Dockerfile to install and configure Gunicorn.
- Configured Gunicorn to log to stdout/stderr to ensure logs are captured by Docker.
- Retained existing logging setup within `app.py` for consistency.

dwd_global_rad_api_server_dev/Dockerfile

@@ -1,26 +1,64 @@
-FROM python:3.12-slim
+# Stage 1: Build Stage
+FROM continuumio/miniconda3:latest AS builder
 
+# Set environment variables for PROJ
+ENV PROJ_LIB=/usr/share/proj
+ENV PROJ_DIR=/usr
+ENV PATH="/opt/conda/bin:$PATH"
+
+# Set work directory
+WORKDIR /app
+
+# Install system dependencies and clean up APT lists
 RUN apt-get update && apt-get install -y \
     build-essential \
-    libfreetype6-dev \
-    libpng-dev \
-    pkg-config \
-    sudo \
-    git \
-    ffmpeg \
-    procps \
-    libhdf5-dev \
+    gcc \
+    g++ \
+    ncdu \
     && rm -rf /var/lib/apt/lists/*
 
-RUN pip install --upgrade pip setuptools wheel
-
+# Copy requirements file
 COPY requirements.txt .
-RUN pip install -r requirements.txt
 
-COPY app.py /app/app.py
-COPY main.py /app/main.py
+# Update Conda, create environment, install packages, and clean up caches
+RUN conda update -n base -c defaults conda && \
+    conda install -y -c conda-forge python=3.12 hdf5 netcdf4 proj gdal geos && \
+    pip install --upgrade pip && \
+    pip install --no-cache-dir -r requirements.txt && \
+    conda clean --all -y && \
+    pip cache purge && \
+    rm -rf /opt/conda/pkgs
+
+# Install Gunicorn in the base Conda environment
+RUN pip install gunicorn
+
+# Copy the rest of your application files
+COPY . .
+
+# Stage 2: Final Stage
+FROM continuumio/miniconda3:latest
+
+# Set environment variables for PROJ
+ENV PROJ_LIB=/usr/share/proj
+ENV PROJ_DIR=/usr
+ENV PATH="/opt/conda/bin:$PATH"
+
+# Set work directory
 WORKDIR /app
 
-EXPOSE 5002
-# Run the application
-CMD ["python", "app.py"]
+# Copy the environment from the build stage
+COPY --from=builder /opt/conda /opt/conda
+
+# Copy application files
+COPY --from=builder /app /app
+
+# Expose the port the app runs on
+EXPOSE 5001
+
+# Run the application using Gunicorn with stdout/stderr logging
+CMD ["gunicorn", "--workers", "1", "--threads", "1", "-b", "0.0.0.0:5001", "--capture-output", "--access-logfile", "-", "--error-logfile", "-", "app:app"]
+
+
+
+
+

dwd_global_rad_api_server_dev/app.py

@@ -7,12 +7,13 @@
 import logging
 import dwd_global_radiation as dgr
 from datetime import datetime, timezone
+from logging.handlers import RotatingFileHandler
 
 app = Flask(__name__)
 
 # Instantiate main object
 objGlobalRadiation = dgr.GlobalRadiation()
-# Configure logging with a custom formatter
+
 class CustomFormatter(logging.Formatter):
     def format(self, record):
         log_format = '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
@@ -33,15 +34,11 @@ def format(self, record):
 @app.route('/locations/<name>/forecast/<int:number_of_hours>h', methods=['GET'])
 def get_forecast_for_future_hour(name, number_of_hours):
     try:
-        # Get the current datetime
         datetime_input = datetime.now(timezone.utc)
-
-        # Get the location
         location = objGlobalRadiation.get_location_by_name(name)
         if not location:
             return jsonify({'error': 'Location not found'}), 404
 
-        # Get the forecast for the specified future hour
         forecast = location.get_forecast_for_future_hour(datetime_input, number_of_hours)
         return jsonify(forecast)
     except Exception as e:
@@ -75,8 +72,6 @@ def process():
     except Exception as e:
         app.logger.error(f"Error processing request: {e}")
         return jsonify({'error': str(e)}), 500
-# Instantiate main object
-objGlobalRadiation = dgr.GlobalRadiation()
 
 @app.route('/locations', methods=['GET'])
 def get_locations():
@@ -85,7 +80,6 @@ def get_locations():
         return jsonify({'error': 'No locations found'}), 404
 
     serializable_locations = [loc.to_dict() for loc in locations]
-    print(json.dumps(serializable_locations, indent=2))  # Pretty-print the JSON data
     return jsonify(serializable_locations)
 
 @app.route('/locations', methods=['POST'])
@@ -95,16 +89,13 @@ def add_location():
     latitude = data['latitude']
     longitude = data['longitude']
     try:
-        # Call the add_location method from the GlobalRadiation class
         objGlobalRadiation.add_location(name=name, latitude=latitude, longitude=longitude)
         return jsonify({'status': 'Location added successfully'}), 200
     except ValueError as e:
-        # Handle the exception and return a 400 Bad Request response
         return jsonify({'error': str(e)}), 400
 
 @app.route('/locations/<name>', methods=['GET'])
 def get_location_by_name(name):
-    """Fetch a specific location by name."""
     location = objGlobalRadiation.get_location_by_name(name)
     if location is None:
         return jsonify({'error': 'Location not found'}), 404
@@ -113,10 +104,7 @@ def get_location_by_name(name):
 
 @app.route('/forecasts', methods=['GET'])
 def fetch_forecasts():
-    """Check if forecast data is available."""
-    # Fetch the forecast data from the DWD servers
     objGlobalRadiation.fetch_forecasts()
-
     forecast_data = objGlobalRadiation.forecast_data
     if forecast_data is None:
         return jsonify({'error': 'Forecast data not found'}), 404
@@ -125,13 +113,8 @@ def fetch_forecasts():
 
 @app.route('/measurements', methods=['GET'])
 def fetch_measurements():
-    """Fetch the measurement data for a specific location by name."""
-
-    # Get the 'hours' query parameter from the request, default to 3 if not provided
     hours = request.args.get('hours', default=3, type=int)
-    # Fetch the measurement data from the DWD servers
     objGlobalRadiation.fetch_measurements(max_hour_age_of_measurement=hours)
-
     measurement_data = objGlobalRadiation.measurement_data
     if measurement_data is None:
         return jsonify({'error': 'Forecast data not found'}), 404
@@ -140,17 +123,15 @@ def fetch_measurements():
 
 @app.route('/locations/<name>', methods=['DELETE'])
 def remove_location(name):
-    """Remove a specific location by name."""
     try:
         objGlobalRadiation.remove_location(name)
         return jsonify({'status': 'Location removed successfully'}), 200
     except ValueError as e:
         return jsonify({'error': str(e)}), 404
-@app.route('/status', methods=['GET'])
 
+@app.route('/status', methods=['GET'])
 def get_status():
-    """Endpoint to check if the API server is running."""
-    return '', 204  # No Content status
+    return '', 204
 
 if __name__ == '__main__':
     app.run(host='0.0.0.0', port=5001)

dwd_global_rad_api_server_dev/config.yaml

@@ -1,6 +1,6 @@
 # https://developers.home-assistant.io/docs/add-ons/configuration#add-on-config
 name: DWD Global Rad Api Server (Development)
-version: "0.1.0"
+version: "0.1.1"
 slug: dwd_global_rad_api_server_dev
 description: DWD Global Rad Api Server
 arch:

dwd_global_rad_api_server_dev/requirements.txt

@@ -1,8 +1,8 @@
 matplotlib
 cartopy
-numpy==2.0.0
+numpy<2
 xarray
-netCDF4==1.7.0
+netCDF4
 flask
 requests
 dwd_global_radiation