a

app.py

@@ -8,9 +8,19 @@ from brother_ql.backends.helpers import send
 from brother_ql.raster import BrotherQLRaster
 from PIL import Image
 import mimetypes
+import logging
+from logging.handlers import RotatingFileHandler
 
 app = Flask(__name__)
 
+# Set up logging
+log_file = 'log.txt'
+log_handler = RotatingFileHandler(log_file, maxBytes=10*1024*1024, backupCount=5)  # 10MB per log file, keep 5 backups
+log_handler.setLevel(logging.INFO)
+log_formatter = logging.Formatter('%(asctime)s - %(levelname)s - %(message)s')
+log_handler.setFormatter(log_formatter)
+app.logger.addHandler(log_handler)
+
 # Create a queue to hold the files for processing
 file_queue = queue.Queue()
 
@@ -33,7 +43,7 @@ def convert_pdf_to_image(pdf_path):
             return images[0]  # We will only print the first page for now
         return None
     except Exception as e:
-        print(f"Error converting PDF: {str(e)}")
+        app.logger.error(f"Error converting PDF: {str(e)}")
         return None
 
 # Function to print address labels
@@ -52,7 +62,7 @@ def print_address_label(pdf_path):
         qlr = BrotherQLRaster(printer_model)
         qlr.exception_on_warning = True
 
-        print("Converting image to printer instructions...")
+        app.logger.info("Converting image to printer instructions...")
         instructions = convert(
             qlr=qlr,
             images=[image],  # Pass as a list with the single image
@@ -66,17 +76,17 @@ def print_address_label(pdf_path):
             cut=True
         )
 
-        print("Sending to printer...")
+        app.logger.info("Sending to printer...")
         send(
             instructions=instructions, 
             printer_identifier=printer, 
             backend_identifier=backend, 
             blocking=True
         )
-        print("Print job sent successfully")
+        app.logger.info("Print job sent successfully")
         
     except Exception as e:
-        print(f"Error during printing: {str(e)}")
+        app.logger.error(f"Error during printing: {str(e)}")
 
 # Worker thread that processes files from the queue
 def process_queue():
@@ -86,6 +96,7 @@ def process_queue():
         if file_path is None:  # Shutdown signal
             break
         # Process the file (convert and print)
+        app.logger.info(f"Processing file: {file_path}")
         print_address_label(file_path)
         # Signal that the task is done
         file_queue.task_done()
@@ -98,21 +109,25 @@ thread.start()
 def upload_file():
     # Check if a file is part of the request
     if 'file' not in request.files:
+        app.logger.warning('No file part in request')
         return jsonify({'error': 'No file part'}), 400
     
     file = request.files['file']
     
     if file.filename == '':
+        app.logger.warning('No selected file')
         return jsonify({'error': 'No selected file'}), 400
 
     # Check file type (ensure it's a PDF)
     mime_type, _ = mimetypes.guess_type(file.filename)
     if mime_type != 'application/pdf':
+        app.logger.warning(f"Invalid file type: {mime_type}. Only PDF files are allowed.")
         return jsonify({'error': 'Only PDF files are allowed'}), 400
 
     # Save the file to the uploads folder
     file_path = os.path.join(UPLOAD_FOLDER, file.filename)
     file.save(file_path)
+    app.logger.info(f"File {file.filename} uploaded and saved to {file_path}")
 
     # Add the file path to the queue for processing
     file_queue.put(file_path)