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Creates a new chat session for a specific document section by generating a unique session ID, initializing a ChatSession object, storing it in application state with thread-safe locking, and persisting it to file.

Purpose

This function is used to initialize a new chat conversation context for a particular section within a document. It ensures thread-safe creation and storage of chat sessions in a multi-threaded Flask application environment. The function generates a UUID for session identification, creates a ChatSession instance, stores it in the global app_state dictionary under thread-safe locks, and immediately persists the session to disk for durability.

Source Code

def create_chat_session(section_id, document_id):
    """Create a new chat session for a section"""
    session_id = str(uuid.uuid4())
    chat_session = ChatSession(session_id, section_id, document_id)
    
    with app_state['locks']['chat_sessions']:
        app_state['chat_sessions'][session_id] = chat_session
    
    # Save session to file immediately
    save_chat_session_to_file(chat_session)
    
    return chat_session

Parameters

Parameter Details

section_id: Identifier for the specific section of a document where the chat session will be associated. This should be a string or numeric value that uniquely identifies a section within the document structure.

document_id: Identifier for the document that contains the section. This should be a string or numeric value that uniquely identifies the document in the system. Used to associate the chat session with the correct document context.

Return Value

Returns a ChatSession object that represents the newly created chat session. This object contains the session_id (UUID string), section_id, and document_id, along with any other attributes defined in the ChatSession class. The returned object can be used to manage the conversation state and retrieve session information.

Dependencies

• uuid
• threading

Required Imports

import uuid
from threading import Lock

Usage Example

# Assuming app_state, ChatSession class, and save_chat_session_to_file are already defined
import uuid
from threading import Lock

# Initialize app_state (typically done at application startup)
app_state = {
    'locks': {
        'chat_sessions': Lock()
    },
    'chat_sessions': {}
}

# Define ChatSession class (example)
class ChatSession:
    def __init__(self, session_id, section_id, document_id):
        self.session_id = session_id
        self.section_id = section_id
        self.document_id = document_id
        self.messages = []

# Define save function (example)
def save_chat_session_to_file(chat_session):
    # Implementation to save session to file
    pass

# Create a new chat session
section_id = "section_123"
document_id = "doc_456"
new_session = create_chat_session(section_id, document_id)

print(f"Created session: {new_session.session_id}")
print(f"For section: {new_session.section_id}")
print(f"In document: {new_session.document_id}")

Best Practices

• Ensure app_state is properly initialized before calling this function to avoid KeyError exceptions
• The ChatSession class must be defined with a constructor that accepts session_id, section_id, and document_id parameters
• The save_chat_session_to_file function must be implemented to handle file I/O errors gracefully
• Consider implementing error handling for lock acquisition timeouts in high-concurrency scenarios
• Validate section_id and document_id parameters before creating the session to ensure they reference valid entities
• The function assumes single-threaded access within the lock context; avoid calling other functions that might acquire the same lock to prevent deadlocks
• Consider implementing session cleanup mechanisms to prevent unbounded growth of the chat_sessions dictionary
• The immediate file save operation may impact performance; consider implementing asynchronous or batched persistence for high-throughput scenarios

Tags

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