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"""Test Tracer classes."""
from __future__ import annotations
import threading
from datetime import datetime
from typing import List, Optional, Union
import pytest
from freezegun import freeze_time
from langchain.callbacks.tracers.base import (
BaseTracer,
ChainRun,
LLMRun,
SharedTracer,
ToolRun,
Tracer,
TracerException,
TracerSession,
)
from langchain.callbacks.tracers.schemas import TracerSessionCreate
from langchain.schema import LLMResult
TEST_SESSION_ID = 2023
@freeze_time("2023-01-01")
def _get_compare_run() -> Union[LLMRun, ChainRun, ToolRun]:
return ChainRun(
id=None,
error=None,
start_time=datetime.utcnow(),
end_time=datetime.utcnow(),
extra={},
execution_order=1,
serialized={},
inputs={},
outputs={},
session_id=TEST_SESSION_ID,
child_runs=[
ToolRun(
id=None,
start_time=datetime.utcnow(),
end_time=datetime.utcnow(),
extra={},
execution_order=2,
serialized={},
tool_input="test",
output="test",
action="{}",
session_id=TEST_SESSION_ID,
error=None,
child_runs=[
LLMRun(
id=None,
error=None,
start_time=datetime.utcnow(),
end_time=datetime.utcnow(),
extra={},
execution_order=3,
serialized={},
prompts=[],
response=LLMResult([[]]),
session_id=TEST_SESSION_ID,
)
],
),
LLMRun(
id=None,
error=None,
start_time=datetime.utcnow(),
end_time=datetime.utcnow(),
extra={},
execution_order=4,
serialized={},
prompts=[],
response=LLMResult([[]]),
session_id=TEST_SESSION_ID,
),
],
)
def _perform_nested_run(tracer: BaseTracer) -> None:
"""Perform a nested run."""
tracer.on_chain_start(serialized={}, inputs={})
tracer.on_tool_start(serialized={}, input_str="test")
tracer.on_llm_start(serialized={}, prompts=[])
tracer.on_llm_end(response=LLMResult([[]]))
tracer.on_tool_end("test")
tracer.on_llm_start(serialized={}, prompts=[])
tracer.on_llm_end(response=LLMResult([[]]))
tracer.on_chain_end(outputs={})
def _add_child_run(
parent_run: Union[ChainRun, ToolRun],
child_run: Union[LLMRun, ChainRun, ToolRun],
) -> None:
"""Add child run to a chain run or tool run."""
parent_run.child_runs.append(child_run)
def _generate_id() -> Optional[Union[int, str]]:
"""Generate an id for a run."""
return None
def load_session(session_name: str) -> TracerSession:
"""Load a tracing session."""
return TracerSession(id=1, name=session_name, start_time=datetime.utcnow())
def _persist_session(session: TracerSessionCreate) -> TracerSession:
"""Persist a tracing session."""
return TracerSession(id=TEST_SESSION_ID, **session.dict())
def load_default_session() -> TracerSession:
"""Load a tracing session."""
return TracerSession(id=1, name="default", start_time=datetime.utcnow())
class FakeTracer(Tracer):
"""Fake tracer that records LangChain execution."""
def __init__(self) -> None:
"""Initialize the tracer."""
super().__init__()
self.runs: List[Union[LLMRun, ChainRun, ToolRun]] = []
def _persist_run(self, run: Union[LLMRun, ChainRun, ToolRun]) -> None:
"""Persist a run."""
self.runs.append(run)
def _add_child_run(
self,
parent_run: Union[ChainRun, ToolRun],
child_run: Union[LLMRun, ChainRun, ToolRun],
) -> None:
"""Add child run to a chain run or tool run."""
_add_child_run(parent_run, child_run)
def _generate_id(self) -> Optional[Union[int, str]]:
"""Generate an id for a run."""
return _generate_id()
def _persist_session(self, session: TracerSessionCreate) -> TracerSession:
"""Persist a tracing session."""
return _persist_session(session)
def load_session(self, session_name: str) -> TracerSession:
"""Load a tracing session."""
return load_session(session_name)
def load_default_session(self) -> TracerSession:
"""Load a tracing session."""
return load_default_session()
class FakeSharedTracer(SharedTracer):
"""Fake shared tracer that records LangChain execution."""
runs: List[Union[LLMRun, ChainRun, ToolRun]] = []
def _persist_run(self, run: Union[LLMRun, ChainRun, ToolRun]) -> None:
"""Persist a run."""
with self._lock:
self.runs.append(run)
def remove_runs(self) -> None:
"""Remove all runs."""
with self._lock:
self.runs = []
def _add_child_run(
self,
parent_run: Union[ChainRun, ToolRun],
child_run: Union[LLMRun, ChainRun, ToolRun],
) -> None:
"""Add child run to a chain run or tool run."""
_add_child_run(parent_run, child_run)
def _generate_id(self) -> Optional[Union[int, str]]:
"""Generate an id for a run."""
return _generate_id()
def _persist_session(self, session: TracerSessionCreate) -> TracerSession:
"""Persist a tracing session."""
return _persist_session(session)
def load_session(self, session_name: str) -> TracerSession:
"""Load a tracing session."""
return load_session(session_name)
def load_default_session(self) -> TracerSession:
"""Load a tracing session."""
return load_default_session()
@freeze_time("2023-01-01")
def test_tracer_llm_run() -> None:
"""Test tracer on an LLM run."""
compare_run = LLMRun(
id=None,
start_time=datetime.utcnow(),
end_time=datetime.utcnow(),
extra={},
execution_order=1,
serialized={},
prompts=[],
response=LLMResult([[]]),
session_id=TEST_SESSION_ID,
error=None,
)
tracer = FakeTracer()
tracer.new_session()
tracer.on_llm_start(serialized={}, prompts=[])
tracer.on_llm_end(response=LLMResult([[]]))
assert tracer.runs == [compare_run]
@freeze_time("2023-01-01")
def test_tracer_llm_run_errors_no_session() -> None:
"""Test tracer on an LLM run without a session."""
tracer = FakeTracer()
with pytest.raises(TracerException):
tracer.on_llm_start(serialized={}, prompts=[])
@freeze_time("2023-01-01")
def test_tracer_llm_run_errors_no_start() -> None:
"""Test tracer on an LLM run without a start."""
tracer = FakeTracer()
tracer.new_session()
with pytest.raises(TracerException):
tracer.on_llm_end(response=LLMResult([[]]))
@freeze_time("2023-01-01")
def test_tracer_multiple_llm_runs() -> None:
"""Test the tracer with multiple runs."""
compare_run = LLMRun(
id=None,
start_time=datetime.utcnow(),
end_time=datetime.utcnow(),
extra={},
execution_order=1,
serialized={},
prompts=[],
response=LLMResult([[]]),
session_id=TEST_SESSION_ID,
error=None,
)
tracer = FakeTracer()
tracer.new_session()
num_runs = 10
for _ in range(num_runs):
tracer.on_llm_start(serialized={}, prompts=[])
tracer.on_llm_end(response=LLMResult([[]]))
assert tracer.runs == [compare_run] * num_runs
@freeze_time("2023-01-01")
def test_tracer_chain_run() -> None:
"""Test tracer on a Chain run."""
compare_run = ChainRun(
id=None,
start_time=datetime.utcnow(),
end_time=datetime.utcnow(),
extra={},
execution_order=1,
serialized={},
inputs={},
outputs={},
session_id=TEST_SESSION_ID,
error=None,
)
tracer = FakeTracer()
tracer.new_session()
tracer.on_chain_start(serialized={}, inputs={})
tracer.on_chain_end(outputs={})
assert tracer.runs == [compare_run]
@freeze_time("2023-01-01")
def test_tracer_tool_run() -> None:
"""Test tracer on a Tool run."""
compare_run = ToolRun(
id=None,
start_time=datetime.utcnow(),
end_time=datetime.utcnow(),
extra={},
execution_order=1,
serialized={},
tool_input="test",
output="test",
action="{}",
session_id=TEST_SESSION_ID,
error=None,
)
tracer = FakeTracer()
tracer.new_session()
tracer.on_tool_start(serialized={}, input_str="test")
tracer.on_tool_end("test")
assert tracer.runs == [compare_run]
@freeze_time("2023-01-01")
def test_tracer_nested_run() -> None:
"""Test tracer on a nested run."""
tracer = FakeTracer()
tracer.new_session()
_perform_nested_run(tracer)
assert tracer.runs == [_get_compare_run()]
@freeze_time("2023-01-01")
def test_tracer_llm_run_on_error() -> None:
"""Test tracer on an LLM run with an error."""
exception = Exception("test")
compare_run = LLMRun(
id=None,
start_time=datetime.utcnow(),
end_time=datetime.utcnow(),
extra={},
execution_order=1,
serialized={},
prompts=[],
response=None,
session_id=TEST_SESSION_ID,
error=repr(exception),
)
tracer = FakeTracer()
tracer.new_session()
tracer.on_llm_start(serialized={}, prompts=[])
tracer.on_llm_error(exception)
assert tracer.runs == [compare_run]
@freeze_time("2023-01-01")
def test_tracer_chain_run_on_error() -> None:
"""Test tracer on a Chain run with an error."""
exception = Exception("test")
compare_run = ChainRun(
id=None,
start_time=datetime.utcnow(),
end_time=datetime.utcnow(),
extra={},
execution_order=1,
serialized={},
inputs={},
outputs=None,
session_id=TEST_SESSION_ID,
error=repr(exception),
)
tracer = FakeTracer()
tracer.new_session()
tracer.on_chain_start(serialized={}, inputs={})
tracer.on_chain_error(exception)
assert tracer.runs == [compare_run]
@freeze_time("2023-01-01")
def test_tracer_tool_run_on_error() -> None:
"""Test tracer on a Tool run with an error."""
exception = Exception("test")
compare_run = ToolRun(
id=None,
start_time=datetime.utcnow(),
end_time=datetime.utcnow(),
extra={},
execution_order=1,
serialized={},
tool_input="test",
output=None,
action="{}",
session_id=TEST_SESSION_ID,
error=repr(exception),
)
tracer = FakeTracer()
tracer.new_session()
tracer.on_tool_start(serialized={}, input_str="test")
tracer.on_tool_error(exception)
assert tracer.runs == [compare_run]
@freeze_time("2023-01-01")
def test_tracer_nested_runs_on_error() -> None:
"""Test tracer on a nested run with an error."""
exception = Exception("test")
tracer = FakeTracer()
tracer.new_session()
for _ in range(3):
tracer.on_chain_start(serialized={}, inputs={})
tracer.on_llm_start(serialized={}, prompts=[])
tracer.on_llm_end(response=LLMResult([[]]))
tracer.on_llm_start(serialized={}, prompts=[])
tracer.on_llm_end(response=LLMResult([[]]))
tracer.on_tool_start(serialized={}, input_str="test")
tracer.on_llm_start(serialized={}, prompts=[])
tracer.on_llm_error(exception)
tracer.on_tool_error(exception)
tracer.on_chain_error(exception)
compare_run = ChainRun(
id=None,
start_time=datetime.utcnow(),
end_time=datetime.utcnow(),
extra={},
execution_order=1,
serialized={},
session_id=TEST_SESSION_ID,
error=repr(exception),
inputs={},
outputs=None,
child_runs=[
LLMRun(
id=None,
start_time=datetime.utcnow(),
end_time=datetime.utcnow(),
extra={},
execution_order=2,
serialized={},
session_id=TEST_SESSION_ID,
error=None,
prompts=[],
response=LLMResult(generations=[[]], llm_output=None),
),
LLMRun(
id=None,
start_time=datetime.utcnow(),
end_time=datetime.utcnow(),
extra={},
execution_order=3,
serialized={},
session_id=TEST_SESSION_ID,
error=None,
prompts=[],
response=LLMResult(generations=[[]], llm_output=None),
),
ToolRun(
id=None,
start_time=datetime.utcnow(),
end_time=datetime.utcnow(),
extra={},
execution_order=4,
serialized={},
session_id=TEST_SESSION_ID,
error=repr(exception),
tool_input="test",
output=None,
action="{}",
child_runs=[
LLMRun(
id=None,
start_time=datetime.utcnow(),
end_time=datetime.utcnow(),
extra={},
execution_order=5,
serialized={},
session_id=TEST_SESSION_ID,
error=repr(exception),
prompts=[],
response=None,
)
],
child_llm_runs=[],
child_chain_runs=[],
child_tool_runs=[],
),
],
child_llm_runs=[],
child_chain_runs=[],
child_tool_runs=[],
)
assert tracer.runs == [compare_run] * 3
@freeze_time("2023-01-01")
def test_shared_tracer_nested_run() -> None:
"""Test shared tracer on a nested run."""
tracer = FakeSharedTracer()
tracer.new_session()
tracer.remove_runs()
_perform_nested_run(tracer)
assert tracer.runs == [_get_compare_run()]
@freeze_time("2023-01-01")
def test_shared_tracer_nested_run_multithreaded() -> None:
"""Test shared tracer on a nested run."""
tracer = FakeSharedTracer()
tracer.remove_runs()
tracer.new_session()
threads = []
num_threads = 10
for _ in range(num_threads):
thread = threading.Thread(target=_perform_nested_run, args=(tracer,))
thread.start()
threads.append(thread)
for thread in threads:
thread.join()
assert tracer.runs == [_get_compare_run()] * num_threads
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