f

app.py

@@ -10,6 +10,7 @@ from PIL import Image
 import mimetypes
 import logging
 from logging.handlers import RotatingFileHandler
+import time
 
 app = Flask(__name__)
 
@@ -79,10 +80,13 @@ def print_address_label(pdf_path):
             cut=True
         )
 
-        app.logger.info("Waiting to acquire printer lock...")
+        # Try to acquire the printer lock with a timeout
-        with printer_lock:  # Ensure only one thread sends a job at a time
+        max_retries = 3
-            app.logger.info("Sending to printer...")
+        retry_delay = 2  # seconds
+        for attempt in range(max_retries):
+            if printer_lock.acquire(timeout=5):  # 5 seconds timeout
                 try:
+                    app.logger.info(f"Attempting to send print job (Attempt {attempt + 1})...")
                     send(
                         instructions=instructions, 
                         printer_identifier=printer, 
@@ -90,8 +94,22 @@ def print_address_label(pdf_path):
                         blocking=True
                     )
                     app.logger.info("Print job sent successfully")
+                    break
                 except Exception as e:
                     app.logger.error(f"Error during printing: {str(e)}")
+                    if attempt < max_retries - 1:
+                        app.logger.info(f"Retrying after {retry_delay} seconds...")
+                        time.sleep(retry_delay)
+                    else:
+                        app.logger.error("Max retries reached. Failed to send print job.")
+            else:
+                app.logger.error(f"Failed to acquire printer lock (Attempt {attempt + 1}). Printer is busy.")
+                if attempt < max_retries - 1:
+                    app.logger.info(f"Retrying after {retry_delay} seconds...")
+                    time.sleep(retry_delay)
+                else:
+                    app.logger.error("Printer is still busy after retries.")
+                    raise Exception("Printer is busy. Try again later.")
     
     except Exception as e:
         app.logger.error(f"Error during label printing: {str(e)}")