release lock

1 files changed, 13 insertions, 8 deletions

diff --git a/backend.py b/backend.py
index 811db4f..66d5bac 100644
--- a/backend.py
+++ b/backend.py
@@ -21,16 +21,21 @@ def print_queue():
     if not print_lock.acquire(blocking=False):
         print("print queue is already running")
         return "print queue busy", 400
-    print("printing file(s) in /srv/shares/public/printing")
-    path = Path("/srv/shares/public/printing")
-    files = [f for f in path.iterdir() if f.is_file()]
+    try:
+        print("printing file(s) in /srv/shares/public/printing")
+        path = Path("/srv/shares/public/printing")
+        files = [f for f in path.iterdir() if f.is_file()]
 
-    for file in files:
-        subprocess.run(["lp", "-d", "Canon_G3060", str(file)], check=True)
-        subprocess.run(["mv", str(file), "/srv/shares/public/printed"], check=True)
+        for file in files:
+            subprocess.run(["lp", "-d", "Canon_G3060", str(file)], check=True)
+            subprocess.run(["mv", str(file), "/srv/shares/public/printed"], check=True)
 
-    print(f"printed {len(files)} file(s)")
-    return f"printed {len(files)} file(s)"
+        print(f"printed {len(files)} file(s)")
+        return f"printed {len(files)} file(s)"
+    except Exception as e:
+        return f"exception: {(str(e))}", 500
+    finally:
+        print_lock.release()
 
 if __name__ == "__main__":
     app.run(host="0.0.0.0", port=6732)