114 lines
3.9 KiB
Python
114 lines
3.9 KiB
Python
"""WebUI chat fork orchestration."""
|
|
|
|
from __future__ import annotations
|
|
|
|
import re
|
|
import uuid
|
|
from collections.abc import Mapping
|
|
from typing import Any
|
|
|
|
from nanobot.session.manager import SessionManager
|
|
from nanobot.session.webui_turns import WEBUI_TITLE_METADATA_KEY, clean_generated_title
|
|
from nanobot.webui.transcript import (
|
|
append_fork_marker,
|
|
delete_webui_transcript,
|
|
fork_transcript_before_user_index,
|
|
write_session_messages_as_transcript,
|
|
)
|
|
|
|
_WEBUI_CHAT_ID_RE = re.compile(r"^[A-Za-z0-9_:-]{1,64}$")
|
|
|
|
|
|
def _valid_webui_chat_id(value: Any) -> bool:
|
|
return isinstance(value, str) and _WEBUI_CHAT_ID_RE.match(value) is not None
|
|
|
|
|
|
def create_webui_chat_fork(
|
|
session_manager: SessionManager,
|
|
*,
|
|
source_chat_id: str,
|
|
before_user_index: int,
|
|
title: str | None = None,
|
|
) -> tuple[str, str] | None:
|
|
"""Return ``(chat_id, session_key)`` for a new fork, or ``None`` for bad input."""
|
|
new_id = str(uuid.uuid4())
|
|
source_key = f"websocket:{source_chat_id}"
|
|
target_key = f"websocket:{new_id}"
|
|
try:
|
|
forked = session_manager.fork_session_before_user_index(
|
|
source_key,
|
|
target_key,
|
|
before_user_index,
|
|
)
|
|
if forked is None:
|
|
return None
|
|
|
|
transcript_ok = fork_transcript_before_user_index(
|
|
source_key,
|
|
target_key,
|
|
before_user_index,
|
|
)
|
|
if not transcript_ok:
|
|
write_session_messages_as_transcript(target_key, forked.messages)
|
|
append_fork_marker(target_key)
|
|
|
|
fork_title = clean_generated_title(title)
|
|
if fork_title:
|
|
forked.metadata[WEBUI_TITLE_METADATA_KEY] = fork_title
|
|
session_manager.save(forked, fsync=True)
|
|
except Exception:
|
|
delete_webui_transcript(target_key)
|
|
session_manager.delete_session(target_key)
|
|
raise
|
|
return new_id, target_key
|
|
|
|
|
|
async def handle_webui_fork_chat(channel: Any, connection: Any, envelope: Mapping[str, Any]) -> None:
|
|
"""Handle the WebUI/desktop ``fork_chat`` websocket command.
|
|
|
|
``websocket.py`` owns the transport. This module owns WebUI fork semantics:
|
|
validate the request, clone session/transcript state, attach the new chat,
|
|
and hydrate the client.
|
|
"""
|
|
source_chat_id = envelope.get("source_chat_id")
|
|
raw_index = envelope.get("before_user_index")
|
|
if not _valid_webui_chat_id(source_chat_id):
|
|
await channel._send_event(connection, "error", detail="invalid source_chat_id")
|
|
return
|
|
if isinstance(raw_index, bool) or not isinstance(raw_index, int) or raw_index < 0:
|
|
await channel._send_event(connection, "error", detail="invalid before_user_index")
|
|
return
|
|
|
|
session_manager = channel.gateway.session_manager
|
|
if session_manager is None:
|
|
await channel._send_event(connection, "error", detail="session_manager_unavailable")
|
|
return
|
|
|
|
try:
|
|
forked = create_webui_chat_fork(
|
|
session_manager,
|
|
source_chat_id=source_chat_id,
|
|
before_user_index=raw_index,
|
|
title=envelope.get("title") if isinstance(envelope.get("title"), str) else None,
|
|
)
|
|
if forked is None:
|
|
await channel._send_event(connection, "error", detail="invalid fork source or index")
|
|
return
|
|
fork_id, fork_key = forked
|
|
except Exception as exc:
|
|
channel.logger.warning("fork_chat failed: {}", exc)
|
|
await channel._send_event(connection, "error", detail="fork_chat_failed")
|
|
return
|
|
|
|
scope = channel._workspaces.scope_for_session_key(fork_key)
|
|
channel._attach(connection, fork_id)
|
|
await channel._send_event(connection, "attached", chat_id=fork_id)
|
|
await channel._send_event(
|
|
connection,
|
|
"session_updated",
|
|
chat_id=fork_id,
|
|
scope="metadata",
|
|
workspace_scope=scope.payload(),
|
|
)
|
|
await channel._hydrate_after_subscribe(fork_id)
|