connection creation in extract and CancelledError handling for sse

backend/score.py

@@ -165,35 +165,36 @@ async def extract_knowledge_graph_from_file(
           Nodes and Relations created in Neo4j databse for the pdf file
     """
     try:
-        graph = create_graph_database_connection(uri, userName, password, database)   
-        graphDb_data_Access = graphDBdataAccess(graph)
         if source_type == 'local file':
             merged_file_path = os.path.join(MERGED_DIR,file_name)
             logging.info(f'File path:{merged_file_path}')
             result = await asyncio.to_thread(
-                extract_graph_from_file_local_file, graph, model, merged_file_path, file_name, allowedNodes, allowedRelationship, uri)
+                extract_graph_from_file_local_file, uri, userName, password, database, model, merged_file_path, file_name, allowedNodes, allowedRelationship)
 
         elif source_type == 's3 bucket' and source_url:
             result = await asyncio.to_thread(
-                extract_graph_from_file_s3, graph, model, source_url, aws_access_key_id, aws_secret_access_key, allowedNodes, allowedRelationship)
+                extract_graph_from_file_s3, uri, userName, password, database, model, source_url, aws_access_key_id, aws_secret_access_key, allowedNodes, allowedRelationship)
 
         elif source_type == 'web-url':
             result = await asyncio.to_thread(
-                extract_graph_from_web_page, graph, model, source_url, allowedNodes, allowedRelationship)
+                extract_graph_from_web_page, uri, userName, password, database, model, source_url, allowedNodes, allowedRelationship)
 
         elif source_type == 'youtube' and source_url:
             result = await asyncio.to_thread(
-                extract_graph_from_file_youtube, graph, model, source_url, allowedNodes, allowedRelationship)
+                extract_graph_from_file_youtube, uri, userName, password, database, model, source_url, allowedNodes, allowedRelationship)
 
         elif source_type == 'Wikipedia' and wiki_query:
             result = await asyncio.to_thread(
-                extract_graph_from_file_Wikipedia, graph, model, wiki_query, max_sources, language, allowedNodes, allowedRelationship)
+                extract_graph_from_file_Wikipedia, uri, userName, password, database, model, wiki_query, max_sources, language, allowedNodes, allowedRelationship)
 
         elif source_type == 'gcs bucket' and gcs_bucket_name:
             result = await asyncio.to_thread(
-                extract_graph_from_file_gcs, graph, model, gcs_project_id, gcs_bucket_name, gcs_bucket_folder, gcs_blob_filename, access_token, allowedNodes, allowedRelationship)
+                extract_graph_from_file_gcs, uri, userName, password, database, model, gcs_project_id, gcs_bucket_name, gcs_bucket_folder, gcs_blob_filename, access_token, allowedNodes, allowedRelationship)
         else:
             return create_api_response('Failed',message='source_type is other than accepted source')
+
+        graph = create_graph_database_connection(uri, userName, password, database)   
+        graphDb_data_Access = graphDBdataAccess(graph)
         if result is not None:
             result['db_url'] = uri
             result['api_name'] = 'extract'
@@ -445,29 +446,32 @@ async def generate():
         if " " in url:
             uri= url.replace(" ","+")
         while True:
-            if await request.is_disconnected():
-                logging.info("Request disconnected")
-                break
-            #get the current status of document node
-            graph = create_graph_database_connection(uri, userName, decoded_password, database)
-            graphDb_data_Access = graphDBdataAccess(graph)
-            result = graphDb_data_Access.get_current_status_document_node(file_name)
-            if result is not None:
-                status = json.dumps({'fileName':file_name, 
-                'status':result[0]['Status'],
-                'processingTime':result[0]['processingTime'],
-                'nodeCount':result[0]['nodeCount'],
-                'relationshipCount':result[0]['relationshipCount'],
-                'model':result[0]['model'],
-                'total_chunks':result[0]['total_chunks'],
-                'total_pages':result[0]['total_pages'],
-                'fileSize':result[0]['fileSize'],
-                'processed_chunk':result[0]['processed_chunk'],
-                'fileSource':result[0]['fileSource']
-                })
-            else:
-                status = json.dumps({'fileName':file_name, 'status':'Failed'})
-            yield status
+            try:
+                if await request.is_disconnected():
+                    logging.info(" SSE Client disconnected")
+                    break
+                # get the current status of document node
+                graph = create_graph_database_connection(uri, userName, decoded_password, database)
+                graphDb_data_Access = graphDBdataAccess(graph)
+                result = graphDb_data_Access.get_current_status_document_node(file_name)
+                if result is not None:
+                    status = json.dumps({'fileName':file_name, 
+                    'status':result[0]['Status'],
+                    'processingTime':result[0]['processingTime'],
+                    'nodeCount':result[0]['nodeCount'],
+                    'relationshipCount':result[0]['relationshipCount'],
+                    'model':result[0]['model'],
+                    'total_chunks':result[0]['total_chunks'],
+                    'total_pages':result[0]['total_pages'],
+                    'fileSize':result[0]['fileSize'],
+                    'processed_chunk':result[0]['processed_chunk'],
+                    'fileSource':result[0]['fileSource']
+                    })
+                else:
+                    status = json.dumps({'fileName':file_name, 'status':'Failed'})
+                yield status
+            except asyncio.CancelledError:
+                logging.info("SSE Connection cancelled")
 
     return EventSourceResponse(generate(),ping=60)
 

backend/src/main.py

@@ -182,7 +182,7 @@ def create_source_node_graph_url_wikipedia(graph, model, wiki_query, source_type
       lst_file_name.append({'fileName':obj_source_node.file_name,'fileSize':obj_source_node.file_size,'url':obj_source_node.url, 'language':obj_source_node.language, 'status':'Success'})
     return lst_file_name,success_count,failed_count
 
-def extract_graph_from_file_local_file(graph, model, merged_file_path, fileName, allowedNodes, allowedRelationship,uri):
+def extract_graph_from_file_local_file(uri, userName, password, database, model, merged_file_path, fileName, allowedNodes, allowedRelationship):
 
   logging.info(f'Process file name :{fileName}')
   gcs_file_cache = os.environ.get('GCS_FILE_CACHE')
@@ -194,9 +194,9 @@ def extract_graph_from_file_local_file(graph, model, merged_file_path, fileName,
   if pages==None or len(pages)==0:
     raise Exception(f'File content is not available for file : {file_name}')
 
-  return processing_source(graph, model, file_name, pages, allowedNodes, allowedRelationship, True, merged_file_path, uri)
+  return processing_source(uri, userName, password, database, model, file_name, pages, allowedNodes, allowedRelationship, True, merged_file_path)
 
-def extract_graph_from_file_s3(graph, model, source_url, aws_access_key_id, aws_secret_access_key, allowedNodes, allowedRelationship):
+def extract_graph_from_file_s3(uri, userName, password, database, model, source_url, aws_access_key_id, aws_secret_access_key, allowedNodes, allowedRelationship):
 
   if(aws_access_key_id==None or aws_secret_access_key==None):
     raise Exception('Please provide AWS access and secret keys')
@@ -207,43 +207,43 @@ def extract_graph_from_file_s3(graph, model, source_url, aws_access_key_id, aws_
   if pages==None or len(pages)==0:
     raise Exception(f'File content is not available for file : {file_name}')
 
-  return processing_source(graph, model, file_name, pages, allowedNodes, allowedRelationship)
+  return processing_source(uri, userName, password, database, model, file_name, pages, allowedNodes, allowedRelationship)
 
-def extract_graph_from_web_page(graph, model, source_url, allowedNodes, allowedRelationship):
+def extract_graph_from_web_page(uri, userName, password, database, model, source_url, allowedNodes, allowedRelationship):
 
   file_name, pages = get_documents_from_web_page(source_url)
 
   if pages==None or len(pages)==0:
     raise Exception(f'Content is not available for given URL : {file_name}')
 
-  return processing_source(graph, model, file_name, pages, allowedNodes, allowedRelationship)
+  return processing_source(uri, userName, password, database, model, file_name, pages, allowedNodes, allowedRelationship)
 
-def extract_graph_from_file_youtube(graph, model, source_url, allowedNodes, allowedRelationship):
+def extract_graph_from_file_youtube(uri, userName, password, database, model, source_url, allowedNodes, allowedRelationship):
 
   file_name, pages = get_documents_from_youtube(source_url)
 
   if pages==None or len(pages)==0:
     raise Exception(f'Youtube transcript is not available for file : {file_name}')
 
-  return processing_source(graph, model, file_name, pages, allowedNodes, allowedRelationship)
+  return processing_source(uri, userName, password, database, model, file_name, pages, allowedNodes, allowedRelationship)
 
-def extract_graph_from_file_Wikipedia(graph, model, wiki_query, max_sources, language, allowedNodes, allowedRelationship):
+def extract_graph_from_file_Wikipedia(uri, userName, password, database, model, wiki_query, max_sources, language, allowedNodes, allowedRelationship):
 
   file_name, pages = get_documents_from_Wikipedia(wiki_query, language)
   if pages==None or len(pages)==0:
     raise Exception(f'Wikipedia page is not available for file : {file_name}')
 
-  return processing_source(graph, model, file_name, pages, allowedNodes, allowedRelationship)
+  return processing_source(uri, userName, password, database, model, file_name, pages, allowedNodes, allowedRelationship)
 
-def extract_graph_from_file_gcs(graph, model, gcs_project_id, gcs_bucket_name, gcs_bucket_folder, gcs_blob_filename, access_token, allowedNodes, allowedRelationship):
+def extract_graph_from_file_gcs(uri, userName, password, database, model, gcs_project_id, gcs_bucket_name, gcs_bucket_folder, gcs_blob_filename, access_token, allowedNodes, allowedRelationship):
 
   file_name, pages = get_documents_from_gcs(gcs_project_id, gcs_bucket_name, gcs_bucket_folder, gcs_blob_filename, access_token)
   if pages==None or len(pages)==0:
     raise Exception(f'File content is not available for file : {file_name}')
 
-  return processing_source(graph, model, file_name, pages, allowedNodes, allowedRelationship)
+  return processing_source(uri, userName, password, database, model, file_name, pages, allowedNodes, allowedRelationship)
 
-def processing_source(graph, model, file_name, pages, allowedNodes, allowedRelationship, is_uploaded_from_local=None, merged_file_path=None, uri=None):
+def processing_source(uri, userName, password, database, model, file_name, pages, allowedNodes, allowedRelationship, is_uploaded_from_local=None, merged_file_path=None):
   """
    Extracts a Neo4jGraph from a PDF file based on the model.
 
@@ -260,6 +260,7 @@ def processing_source(graph, model, file_name, pages, allowedNodes, allowedRelat
      status and model as attributes.
   """
   start_time = datetime.now()
+  graph = create_graph_database_connection(uri, userName, password, database)
   graphDb_data_Access = graphDBdataAccess(graph)
 
   result = graphDb_data_Access.get_current_status_document_node(file_name)
@@ -309,7 +310,7 @@ def processing_source(graph, model, file_name, pages, allowedNodes, allowedRelat
          logging.info('Exit from running loop of processing file')
          exit
       else:
-        node_count,rel_count = processing_chunks(selected_chunks,graph,file_name,model,allowedNodes,allowedRelationship,node_count, rel_count)
+        node_count,rel_count = processing_chunks(selected_chunks,graph,uri, userName, password, database,file_name,model,allowedNodes,allowedRelationship,node_count, rel_count)
         end_time = datetime.now()
         processed_time = end_time - start_time
 
@@ -362,8 +363,14 @@ def processing_source(graph, model, file_name, pages, allowedNodes, allowedRelat
   else:
      logging.info('File does not process because it\'s already in Processing status')
 
-def processing_chunks(chunkId_chunkDoc_list,graph,file_name,model,allowedNodes,allowedRelationship, node_count, rel_count):
+def processing_chunks(chunkId_chunkDoc_list,graph,uri, userName, password, database,file_name,model,allowedNodes,allowedRelationship, node_count, rel_count):
   #create vector index and update chunk node with embedding
+  if graph is not None:
+    if graph._driver._closed:
+      graph = create_graph_database_connection(uri, userName, password, database)
+  else:
+    graph = create_graph_database_connection(uri, userName, password, database)
+
   update_embedding_create_vector_index( graph, chunkId_chunkDoc_list, file_name)
   logging.info("Get graph document list from models")
   graph_documents =  generate_graphDocuments(model, graph, chunkId_chunkDoc_list, allowedNodes, allowedRelationship)