langchain/tests/unit_tests/callbacks/test_callback_manager.py

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"""Test CallbackManager."""
from typing import List, Tuple
import pytest
from langchain.callbacks.base import BaseCallbackHandler
from langchain.callbacks.manager import AsyncCallbackManager, CallbackManager
from langchain.callbacks.stdout import StdOutCallbackHandler
from langchain.schema import AgentAction, AgentFinish, LLMResult
from tests.unit_tests.callbacks.fake_callback_handler import (
BaseFakeCallbackHandler,
FakeAsyncCallbackHandler,
FakeCallbackHandler,
)
def _test_callback_manager(
manager: CallbackManager, *handlers: BaseFakeCallbackHandler
) -> None:
"""Test the CallbackManager."""
run_managers = manager.on_llm_start({}, ["prompt"])
for run_manager in run_managers:
run_manager.on_llm_end(LLMResult(generations=[]))
run_manager.on_llm_error(Exception())
run_manager.on_llm_new_token("foo")
run_manager.on_text("foo")
run_manager_chain = manager.on_chain_start({"name": "foo"}, {})
run_manager_chain.on_chain_end({})
run_manager_chain.on_chain_error(Exception())
run_manager_chain.on_agent_action(AgentAction(tool_input="foo", log="", tool=""))
run_manager_chain.on_agent_finish(AgentFinish(log="", return_values={}))
run_manager_chain.on_text("foo")
run_manager_tool = manager.on_tool_start({}, "")
run_manager_tool.on_tool_end("")
run_manager_tool.on_tool_error(Exception())
run_manager_tool.on_text("foo")
_check_num_calls(handlers)
async def _test_callback_manager_async(
manager: AsyncCallbackManager, *handlers: BaseFakeCallbackHandler
) -> None:
"""Test the CallbackManager."""
run_managers = await manager.on_llm_start({}, ["prompt"])
for run_manager in run_managers:
await run_manager.on_llm_end(LLMResult(generations=[]))
await run_manager.on_llm_error(Exception())
await run_manager.on_llm_new_token("foo")
await run_manager.on_text("foo")
run_manager_chain = await manager.on_chain_start({"name": "foo"}, {})
await run_manager_chain.on_chain_end({})
await run_manager_chain.on_chain_error(Exception())
await run_manager_chain.on_agent_action(
AgentAction(tool_input="foo", log="", tool="")
)
await run_manager_chain.on_agent_finish(AgentFinish(log="", return_values={}))
await run_manager_chain.on_text("foo")
run_manager_tool = await manager.on_tool_start({}, "")
await run_manager_tool.on_tool_end("")
await run_manager_tool.on_tool_error(Exception())
await run_manager_tool.on_text("foo")
_check_num_calls(handlers)
def _check_num_calls(handlers: Tuple[BaseFakeCallbackHandler, ...]) -> None:
for handler in handlers:
assert handler.starts == 4
assert handler.ends == 4
assert handler.errors == 3
assert handler.text == 3
assert handler.llm_starts == 1
assert handler.llm_ends == 1
assert handler.llm_streams == 1
assert handler.chain_starts == 1
assert handler.chain_ends == 1
assert handler.tool_starts == 1
assert handler.tool_ends == 1
def test_callback_manager() -> None:
"""Test the CallbackManager."""
handler1 = FakeCallbackHandler()
handler2 = FakeCallbackHandler()
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manager = CallbackManager(handlers=[handler1, handler2])
_test_callback_manager(manager, handler1, handler2)
def test_ignore_llm() -> None:
"""Test ignore llm param for callback handlers."""
handler1 = FakeCallbackHandler(ignore_llm_=True)
handler2 = FakeCallbackHandler()
manager = CallbackManager(handlers=[handler1, handler2])
run_managers = manager.on_llm_start({}, ["prompt"])
for run_manager in run_managers:
run_manager.on_llm_end(LLMResult(generations=[]))
run_manager.on_llm_error(Exception())
assert handler1.starts == 0
assert handler1.ends == 0
assert handler1.errors == 0
assert handler2.starts == 1
assert handler2.ends == 1
assert handler2.errors == 1
def test_ignore_chain() -> None:
"""Test ignore chain param for callback handlers."""
handler1 = FakeCallbackHandler(ignore_chain_=True)
handler2 = FakeCallbackHandler()
manager = CallbackManager(handlers=[handler1, handler2])
run_manager = manager.on_chain_start({"name": "foo"}, {})
run_manager.on_chain_end({})
run_manager.on_chain_error(Exception())
assert handler1.starts == 0
assert handler1.ends == 0
assert handler1.errors == 0
assert handler2.starts == 1
assert handler2.ends == 1
assert handler2.errors == 1
def test_ignore_agent() -> None:
"""Test ignore agent param for callback handlers."""
handler1 = FakeCallbackHandler(ignore_agent_=True)
handler2 = FakeCallbackHandler()
manager = CallbackManager(handlers=[handler1, handler2])
run_manager = manager.on_tool_start({}, "")
run_manager.on_tool_end("")
run_manager.on_tool_error(Exception())
assert handler1.starts == 0
assert handler1.ends == 0
assert handler1.errors == 0
assert handler2.starts == 1
assert handler2.ends == 1
assert handler2.errors == 1
def test_ignore_retriever() -> None:
"""Test the ignore retriever param for callback handlers."""
handler1 = FakeCallbackHandler(ignore_retriever_=True)
handler2 = FakeCallbackHandler()
manager = CallbackManager(handlers=[handler1, handler2])
run_manager = manager.on_retriever_start("")
run_manager.on_retriever_end([])
run_manager.on_retriever_error(Exception())
assert handler1.starts == 0
assert handler1.ends == 0
assert handler1.errors == 0
assert handler2.starts == 1
assert handler2.ends == 1
assert handler2.errors == 1
@pytest.mark.asyncio
async def test_async_callback_manager() -> None:
"""Test the AsyncCallbackManager."""
handler1 = FakeAsyncCallbackHandler()
handler2 = FakeAsyncCallbackHandler()
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manager = AsyncCallbackManager(handlers=[handler1, handler2])
await _test_callback_manager_async(manager, handler1, handler2)
@pytest.mark.asyncio
async def test_async_callback_manager_sync_handler() -> None:
"""Test the AsyncCallbackManager."""
handler1 = FakeCallbackHandler()
handler2 = FakeAsyncCallbackHandler()
handler3 = FakeAsyncCallbackHandler()
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manager = AsyncCallbackManager(handlers=[handler1, handler2, handler3])
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await _test_callback_manager_async(manager, handler1, handler2, handler3)
def test_callback_manager_inheritance() -> None:
handler1, handler2, handler3, handler4 = (
FakeCallbackHandler(),
FakeCallbackHandler(),
FakeCallbackHandler(),
FakeCallbackHandler(),
)
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callback_manager1 = CallbackManager(handlers=[handler1, handler2])
assert callback_manager1.handlers == [handler1, handler2]
assert callback_manager1.inheritable_handlers == []
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callback_manager2 = CallbackManager(handlers=[])
assert callback_manager2.handlers == []
assert callback_manager2.inheritable_handlers == []
callback_manager2.set_handlers([handler1, handler2])
assert callback_manager2.handlers == [handler1, handler2]
assert callback_manager2.inheritable_handlers == [handler1, handler2]
callback_manager2.set_handlers([handler3, handler4], inherit=False)
assert callback_manager2.handlers == [handler3, handler4]
assert callback_manager2.inheritable_handlers == []
callback_manager2.add_handler(handler1)
assert callback_manager2.handlers == [handler3, handler4, handler1]
assert callback_manager2.inheritable_handlers == [handler1]
callback_manager2.add_handler(handler2, inherit=False)
assert callback_manager2.handlers == [handler3, handler4, handler1, handler2]
assert callback_manager2.inheritable_handlers == [handler1]
run_manager = callback_manager2.on_chain_start({"name": "foo"}, {})
child_manager = run_manager.get_child()
assert child_manager.handlers == [handler1]
assert child_manager.inheritable_handlers == [handler1]
run_manager_tool = child_manager.on_tool_start({}, "")
assert run_manager_tool.handlers == [handler1]
assert run_manager_tool.inheritable_handlers == [handler1]
child_manager2 = run_manager_tool.get_child()
assert child_manager2.handlers == [handler1]
assert child_manager2.inheritable_handlers == [handler1]
def test_callback_manager_configure(monkeypatch: pytest.MonkeyPatch) -> None:
"""Test callback manager configuration."""
monkeypatch.setenv("LANGCHAIN_TRACING_V2", "false")
monkeypatch.setenv("LANGCHAIN_TRACING", "false")
handler1, handler2, handler3, handler4 = (
FakeCallbackHandler(),
FakeCallbackHandler(),
FakeCallbackHandler(),
FakeCallbackHandler(),
)
inheritable_callbacks: List[BaseCallbackHandler] = [handler1, handler2]
local_callbacks: List[BaseCallbackHandler] = [handler3, handler4]
configured_manager = CallbackManager.configure(
inheritable_callbacks=inheritable_callbacks,
local_callbacks=local_callbacks,
verbose=True,
)
assert len(configured_manager.handlers) == 5
assert len(configured_manager.inheritable_handlers) == 2
assert configured_manager.inheritable_handlers == inheritable_callbacks
assert configured_manager.handlers[:4] == inheritable_callbacks + local_callbacks
assert isinstance(configured_manager.handlers[4], StdOutCallbackHandler)
assert isinstance(configured_manager, CallbackManager)
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async_local_callbacks = AsyncCallbackManager(handlers=[handler3, handler4])
async_configured_manager = AsyncCallbackManager.configure(
inheritable_callbacks=inheritable_callbacks,
local_callbacks=async_local_callbacks,
verbose=False,
)
assert len(async_configured_manager.handlers) == 4
assert len(async_configured_manager.inheritable_handlers) == 2
assert async_configured_manager.inheritable_handlers == inheritable_callbacks
assert async_configured_manager.handlers == inheritable_callbacks + [
handler3,
handler4,
]
assert isinstance(async_configured_manager, AsyncCallbackManager)