langchain/tests/unit_tests/callbacks/fake_callback_handler.py

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"""A fake callback handler for testing purposes."""
from typing import Any, Dict, List
from langchain.callbacks.base import BaseCallbackHandler
from langchain.schema import AgentAction, AgentFinish, LLMResult
class FakeCallbackHandler(BaseCallbackHandler):
"""Fake callback handler for testing."""
starts: int = 0
ends: int = 0
errors: int = 0
text: int = 0
def on_llm_start(
self, serialized: Dict[str, Any], prompts: List[str], **kwargs: Any
) -> None:
"""Run when LLM starts running."""
self.starts += 1
def on_llm_end(
self,
response: LLMResult,
) -> None:
"""Run when LLM ends running."""
self.ends += 1
def on_llm_error(self, error: Exception) -> None:
"""Run when LLM errors."""
self.errors += 1
def on_chain_start(
self, serialized: Dict[str, Any], inputs: Dict[str, Any], **kwargs: Any
) -> None:
"""Run when chain starts running."""
self.starts += 1
def on_chain_end(self, outputs: Dict[str, Any]) -> None:
"""Run when chain ends running."""
self.ends += 1
def on_chain_error(self, error: Exception) -> None:
"""Run when chain errors."""
self.errors += 1
def on_tool_start(
self, serialized: Dict[str, Any], action: AgentAction, **kwargs: Any
) -> None:
"""Run when tool starts running."""
self.starts += 1
def on_tool_end(self, output: str, **kwargs: Any) -> None:
"""Run when tool ends running."""
self.ends += 1
def on_tool_error(self, error: Exception) -> None:
"""Run when tool errors."""
self.errors += 1
def on_text(self, text: str, **kwargs: Any) -> None:
"""Run when agent is ending."""
self.text += 1
def on_agent_finish(self, finish: AgentFinish, **kwargs: Any) -> None:
"""Run when agent ends running."""
self.ends += 1