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import sys
from typing import Any
class BaseCallbackHandler:
"""Class to handle callbacks for openai function agent"""
def on_llm_start(self, **kwargs: Any) -> None:
"""Run when LLM starts running."""
def on_llm_new_token(self, token: str, **kwargs: Any) -> None:
"""Run on new LLM token. Only available when streaming is enabled."""
def on_llm_end(self, response: str, **kwargs: Any) -> None:
"""Run when LLM ends running."""
class PrintingCallBackHandler(BaseCallbackHandler):
"""Callback handler to call print function"""
def on_llm_start(self, **kwargs: Any) -> None:
"""Run when LLM starts running."""
def on_llm_new_token(self, token: str, **kwargs: Any) -> None:
"""Run on new LLM token. Only available when streaming is enabled."""
print(token)
def on_llm_end(self, response: str, **kwargs: Any) -> None:
"""Run when LLM ends running."""
class StreamingStdOutCallBackHandler(BaseCallbackHandler):
"""Callback handler to call print function"""
def on_llm_start(self, **kwargs: Any) -> None:
"""Run when LLM starts running."""
def on_llm_new_token(self, token: str, **kwargs: Any) -> None:
"""Run on new LLM token. Only available when streaming is enabled."""
sys.stdout.write(token)
sys.stdout.flush()
def on_llm_end(self, response: str, **kwargs: Any) -> None:
"""Run when LLM ends running."""
class QueueCallback(BaseCallbackHandler):
"""Callback handler for streaming LLM responses to a queue."""
def __init__(self, q):
self.q = q
def on_llm_new_token(self, token: str, **kwargs: any) -> None:
self.q.put(token)
def on_llm_end(self, *args, **kwargs: any) -> None:
return self.q.empty()
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