mirror of
https://github.com/hwchase17/langchain.git
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65 lines
1.8 KiB
Python
65 lines
1.8 KiB
Python
"""A fake callback handler for testing purposes."""
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from typing import Any, Dict, List
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from langchain.callbacks.base import BaseCallbackHandler
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from langchain.schema import AgentAction, LLMResult
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class FakeCallbackHandler(BaseCallbackHandler):
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"""Fake callback handler for testing."""
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def __init__(self) -> None:
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"""Initialize the mock callback handler."""
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self.starts = 0
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self.ends = 0
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self.errors = 0
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def on_llm_start(
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self, serialized: Dict[str, Any], prompts: List[str], **kwargs: Any
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) -> None:
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"""Run when LLM starts running."""
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self.starts += 1
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def on_llm_end(
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self,
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response: LLMResult,
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) -> None:
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"""Run when LLM ends running."""
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self.ends += 1
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def on_llm_error(self, error: Exception) -> None:
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"""Run when LLM errors."""
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self.errors += 1
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def on_chain_start(
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self, serialized: Dict[str, Any], inputs: Dict[str, Any], **kwargs: Any
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) -> None:
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"""Run when chain starts running."""
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self.starts += 1
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def on_chain_end(self, outputs: Dict[str, Any]) -> None:
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"""Run when chain ends running."""
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self.ends += 1
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def on_chain_error(self, error: Exception) -> None:
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"""Run when chain errors."""
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self.errors += 1
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def on_tool_start(
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self, serialized: Dict[str, Any], action: AgentAction, **kwargs: Any
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) -> None:
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"""Run when tool starts running."""
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self.starts += 1
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def on_tool_end(self, output: str, **kwargs: Any) -> None:
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"""Run when tool ends running."""
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self.ends += 1
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def on_tool_error(self, error: Exception) -> None:
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"""Run when tool errors."""
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self.errors += 1
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def on_agent_end(self, log: str, **kwargs: Any) -> None:
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"""Run when agent is ending."""
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self.ends += 1
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