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07715f815b
Description: Add UTF-8 encoding support Issue: Inability to properly handle characters from certain languages (e.g., Korean) Fix: Implement UTF-8 encoding in FileChatMessageHistory --------- Co-authored-by: Eugene Yurtsev <eugene@langchain.dev> Co-authored-by: Eugene Yurtsev <eyurtsev@gmail.com>
57 lines
2.0 KiB
Python
57 lines
2.0 KiB
Python
import json
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from pathlib import Path
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from typing import List, Optional
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from langchain_core.chat_history import (
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BaseChatMessageHistory,
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)
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from langchain_core.messages import BaseMessage, messages_from_dict, messages_to_dict
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class FileChatMessageHistory(BaseChatMessageHistory):
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"""Chat message history that stores history in a local file."""
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def __init__(
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self,
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file_path: str,
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*,
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encoding: Optional[str] = None,
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ensure_ascii: bool = True,
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) -> None:
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"""Initialize the file path for the chat history.
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Args:
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file_path: The path to the local file to store the chat history.
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encoding: The encoding to use for file operations. Defaults to None.
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ensure_ascii: If True, escape non-ASCII in JSON. Defaults to True.
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"""
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self.file_path = Path(file_path)
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self.encoding = encoding
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self.ensure_ascii = ensure_ascii
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if not self.file_path.exists():
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self.file_path.touch()
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self.file_path.write_text(
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json.dumps([], ensure_ascii=self.ensure_ascii), encoding=self.encoding
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)
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@property
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def messages(self) -> List[BaseMessage]: # type: ignore
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"""Retrieve the messages from the local file"""
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items = json.loads(self.file_path.read_text(encoding=self.encoding))
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messages = messages_from_dict(items)
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return messages
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def add_message(self, message: BaseMessage) -> None:
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"""Append the message to the record in the local file"""
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messages = messages_to_dict(self.messages)
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messages.append(messages_to_dict([message])[0])
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self.file_path.write_text(
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json.dumps(messages, ensure_ascii=self.ensure_ascii), encoding=self.encoding
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)
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def clear(self) -> None:
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"""Clear session memory from the local file"""
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self.file_path.write_text(
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json.dumps([], ensure_ascii=self.ensure_ascii), encoding=self.encoding
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)
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