attempt to fix AttributeError: 'function' object has no attribute 'is_db_ready' + PDF validation to limit file size <75MB only

app.py

@@ -49,6 +49,16 @@ def process_pdf(pdf_file, state):
                 state
             )
 
+        # File size validation
+        file_size_mb = os.path.getsize(pdf_file.name) / (1024 * 1024)
+        if file_size_mb >= 75:
+            gr.Error("File size exceeds the 75 MB limit. Please upload a smaller PDF.")
+            return (
+                gr.update(interactive=True),
+                gr.update(visible=False),
+                state
+            )
+
         # Create a new session and directory for the user
         state = new_session()
         if not os.path.exists(state.vector_store_path):
@@ -130,7 +140,8 @@ def chat_with_pdf(message, history, state):
 
 # Gradio Interface
 with gr.Blocks(title="PDF Chatbot") as demo:
-    state = gr.State(new_session)
+    # Corrected: Initialize gr.State with the object returned by the function
+    state = gr.State(new_session())
 
     gr.Markdown(
         """