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"""Callback Handler that writes to a file."""
from typing import Any, Dict, Optional, TextIO, cast
from langchain_core.agents import AgentAction, AgentFinish
from langchain_core.utils.input import print_text
from langchain.callbacks.base import BaseCallbackHandler
class FileCallbackHandler(BaseCallbackHandler):
"""Callback Handler that writes to a file."""
def __init__(
self, filename: str, mode: str = "a", color: Optional[str] = None
) -> None:
"""Initialize callback handler."""
self.file = cast(TextIO, open(filename, mode, encoding="utf-8"))
self.color = color
def __del__(self) -> None:
"""Destructor to cleanup when done."""
self.file.close()
def on_chain_start(
self, serialized: Dict[str, Any], inputs: Dict[str, Any], **kwargs: Any
) -> None:
"""Print out that we are entering a chain."""
class_name = serialized.get("name", serialized.get("id", ["<unknown>"])[-1])
print_text(
f"\n\n\033[1m> Entering new {class_name} chain...\033[0m",
end="\n",
file=self.file,
)
def on_chain_end(self, outputs: Dict[str, Any], **kwargs: Any) -> None:
"""Print out that we finished a chain."""
print_text("\n\033[1m> Finished chain.\033[0m", end="\n", file=self.file)
def on_agent_action(
self, action: AgentAction, color: Optional[str] = None, **kwargs: Any
) -> Any:
"""Run on agent action."""
print_text(action.log, color=color or self.color, file=self.file)
def on_tool_end(
self,
output: str,
color: Optional[str] = None,
observation_prefix: Optional[str] = None,
llm_prefix: Optional[str] = None,
**kwargs: Any,
) -> None:
"""If not the final action, print out observation."""
if observation_prefix is not None:
print_text(f"\n{observation_prefix}", file=self.file)
print_text(output, color=color or self.color, file=self.file)
if llm_prefix is not None:
print_text(f"\n{llm_prefix}", file=self.file)
def on_text(
self, text: str, color: Optional[str] = None, end: str = "", **kwargs: Any
) -> None:
"""Run when agent ends."""
print_text(text, color=color or self.color, end=end, file=self.file)
def on_agent_finish(
self, finish: AgentFinish, color: Optional[str] = None, **kwargs: Any
) -> None:
"""Run on agent end."""
print_text(finish.log, color=color or self.color, end="\n", file=self.file)
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