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from typing import Any, Dict, List, Optional, Union
from types import GeneratorType
from langchain.callbacks.base import AsyncCallbackHandler, BaseCallbackHandler
from langchain.schema import AgentAction, AgentFinish, LLMResult
class StreamingLLMCallbackHandler(AsyncCallbackHandler):
"""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)
class SyncStreamingLLMCallbackHandler(BaseCallbackHandler):
"""Callback handler for streaming LLM responses to a queue."""
def __init__(self, q):
self.q = q
def on_llm_start(
self, serialized: Dict[str, Any], prompts: List[str], **kwargs: Any
) -> None:
"""Do nothing."""
pass
def on_llm_new_token(self, token: str, **kwargs: Any) -> None:
self.q.put(token)
def on_llm_end(self, response: LLMResult, **kwargs: Any) -> None:
"""Do nothing."""
pass
def on_llm_error(
self, error: Union[Exception, KeyboardInterrupt], **kwargs: Any
) -> None:
"""Do nothing."""
pass
def on_chain_start(
self, serialized: Dict[str, Any], inputs: Dict[str, Any], **kwargs: Any
) -> None:
"""Do nothing."""
pass
def on_chain_end(self, outputs: Dict[str, Any], **kwargs: Any) -> None:
"""Do nothing."""
pass
def on_chain_error(
self, error: Union[Exception, KeyboardInterrupt], **kwargs: Any
) -> None:
"""Do nothing."""
pass
def on_tool_start(
self,
serialized: Dict[str, Any],
input_str: str,
**kwargs: Any,
) -> None:
"""Do nothing."""
pass
def on_tool_end(
self,
output: str,
color: Optional[str] = None,
observation_prefix: Optional[str] = None,
llm_prefix: Optional[str] = None,
**kwargs: Any,
) -> None:
"""Do nothing."""
pass
def on_tool_error(
self, error: Union[Exception, KeyboardInterrupt], **kwargs: Any
) -> None:
"""Do nothing."""
pass
def on_agent_action(self, action: AgentAction, **kwargs: Any) -> Any:
"""Run on agent action."""
pass
def on_agent_finish(
self, finish: AgentFinish, color: Optional[str] = None, **kwargs: Any
) -> None:
"""Run on agent end."""
pass
def concatenate_generators(*args):
final_outputs = ""
for g in args:
if isinstance(g, GeneratorType):
for v in g:
yield final_outputs + v
result = v
else:
yield final_outputs + g
result = g
final_outputs += result
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