FSGHDFG

app.py

@@ -11,6 +11,7 @@ import mimetypes
 import logging
 from logging.handlers import RotatingFileHandler
 import time
+import fcntl  # For file locking
 
 app = Flask(__name__)
 
@@ -48,7 +49,7 @@ def convert_pdf_to_image(pdf_path):
         return None
 
 # Function to print address labels
-def print_address_label(pdf_path, print_complete_event):
+def print_address_label(pdf_path):
     try:
         # Convert PDF to image
         image = convert_pdf_to_image(pdf_path)
@@ -84,6 +85,12 @@ def print_address_label(pdf_path, print_complete_event):
             cut=True
         )
 
+        app.logger.info("Attempting to acquire printer lock...")
+
+        # Open the printer device and lock it to prevent concurrent access
+        with open(printer, 'wb') as printer_device:
+            fcntl.flock(printer_device, fcntl.LOCK_EX)  # Exclusive lock on printer device
+            try:
                 app.logger.info("Sending to printer...")
                 send(
                     instructions=instructions, 
@@ -92,14 +99,13 @@ def print_address_label(pdf_path, print_complete_event):
                     blocking=True
                 )
                 app.logger.info("Print job sent successfully")
+            finally:
+                # Ensure the lock is released after the print job is finished
+                fcntl.flock(printer_device, fcntl.LOCK_UN)
 
     except Exception as e:
         app.logger.error(f"Error during printing: {str(e)}")
 
-    finally:
-        # Signal that the current print job is done
-        print_complete_event.set()
-
 # Worker thread that processes files from the queue
 def process_queue():
     while True:
@@ -107,17 +113,10 @@ def process_queue():
         file_path = file_queue.get()
         if file_path is None:  # Shutdown signal
             break
-        
-        # Create an event to signal print job completion
-        print_complete_event = threading.Event()
-
         # Process the file (convert and print)
         app.logger.info(f"Processing file: {file_path}")
-        print_address_label(file_path, print_complete_event)
-
-        # Wait until the current print job is completed before processing the next one
-        print_complete_event.wait()
-
+        print_address_label(file_path)
+        time.sleep(10)
         # Signal that the task is done
         file_queue.task_done()