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Fix Langfuse failure path kwargs and add session_id trace tests
Fix: The Langfuse failure logging path was passing self.model_call_details (which includes original_response, potentially a coroutine) instead of the clean local kwargs copy. This aligns the failure path with the success path behavior (litellm_logging.py:2956). Reverted the session_id-as-trace_id approach as it causes trace collisions in Langfuse (multiple calls in the same session would overwrite each other). Instead, session_id is correctly used only for Langfuse session grouping via trace_params["session_id"], while each call retains its own unique trace_id. Added 4 tests: - session_id correctly passed as trace session_id (not trace_id) - session_id preserved for ERROR level (failure) logs - explicit trace_id takes priority over session_id - failure path kwargs excludes original_response Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Harshit28j
parent
6068b9dfd0
commit
6fce7415bd
2 changed files with 183 additions and 4 deletions
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@ -604,12 +604,9 @@ class LangFuseLogger:
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session_id = clean_metadata.pop("session_id", None)
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trace_name = cast(Optional[str], clean_metadata.pop("trace_name", None))
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trace_id = clean_metadata.pop("trace_id", None)
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# If session_id is provided, use it as trace_id for consistent trace mapping
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if trace_id is None and session_id is not None:
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trace_id = session_id
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# Use standard_logging_object.trace_id if available (when trace_id from metadata is None)
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# This allows standard trace_id to be used when provided in standard_logging_object
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elif trace_id is None and standard_logging_object is not None:
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if trace_id is None and standard_logging_object is not None:
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trace_id = cast(
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Optional[str], standard_logging_object.get("trace_id")
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)
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@ -455,6 +455,188 @@ class TestLangfuseUsageDetails(unittest.TestCase):
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assert self.last_trace_kwargs.get("id") == "call-id-xyz"
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def test_log_langfuse_v2_session_id_passed_as_trace_session_id(self):
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"""
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Test that metadata.session_id is correctly passed as trace_params["session_id"]
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for Langfuse session grouping, and does NOT override trace_id.
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Each LLM call should get its own unique trace_id while sharing the session_id.
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"""
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payload = self._build_standard_logging_payload(trace_id="std-trace-123")
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kwargs = self._build_langfuse_kwargs(payload)
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self.last_trace_kwargs = {}
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with patch(
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"litellm.integrations.langfuse.langfuse._add_prompt_to_generation_params",
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side_effect=lambda generation_params, **kwargs: generation_params,
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create=True,
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):
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self.logger._log_langfuse_v2(
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user_id="user-1",
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metadata={"session_id": "my-session-abc"},
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litellm_params={"metadata": {"session_id": "my-session-abc"}},
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output=None,
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start_time=datetime.datetime.utcnow(),
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end_time=datetime.datetime.utcnow(),
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kwargs=kwargs,
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optional_params={},
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input=None,
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response_obj=None,
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level="INFO",
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litellm_call_id="call-id-456",
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)
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# session_id should be set for Langfuse session grouping
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assert self.last_trace_kwargs.get("session_id") == "my-session-abc"
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# trace_id should remain the standard trace_id, NOT the session_id
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assert self.last_trace_kwargs.get("id") == "std-trace-123"
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def test_log_langfuse_v2_session_id_preserved_for_error_level(self):
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"""
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Test that session_id is correctly passed in trace_params even when
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the log level is ERROR (failure case). This verifies the fix for
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failed requests losing session_id mapping in Langfuse.
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"""
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payload = self._build_standard_logging_payload(trace_id="std-trace-err")
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kwargs = self._build_langfuse_kwargs(payload)
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self.last_trace_kwargs = {}
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with patch(
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"litellm.integrations.langfuse.langfuse._add_prompt_to_generation_params",
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side_effect=lambda generation_params, **kwargs: generation_params,
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create=True,
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):
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self.logger._log_langfuse_v2(
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user_id="user-1",
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metadata={"session_id": "error-session-xyz"},
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litellm_params={"metadata": {"session_id": "error-session-xyz"}},
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output="BadRequestError: model not found",
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start_time=datetime.datetime.utcnow(),
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end_time=datetime.datetime.utcnow(),
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kwargs=kwargs,
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optional_params={},
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input={"messages": [{"role": "user", "content": "test"}]},
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response_obj=None,
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level="ERROR",
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litellm_call_id="call-id-err-789",
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)
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# session_id must be preserved even for ERROR level logs
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assert self.last_trace_kwargs.get("session_id") == "error-session-xyz"
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# trace_id should be the standard trace_id, not the session_id
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assert self.last_trace_kwargs.get("id") == "std-trace-err"
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# status_message should be set for error traces
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assert self.last_trace_kwargs.get("status_message") is not None
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def test_log_langfuse_v2_explicit_trace_id_takes_priority_over_session_id(self):
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"""
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Test that when both trace_id and session_id are provided in metadata,
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trace_id takes priority as the trace identifier.
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"""
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payload = self._build_standard_logging_payload()
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kwargs = self._build_langfuse_kwargs(payload)
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self.last_trace_kwargs = {}
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with patch(
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"litellm.integrations.langfuse.langfuse._add_prompt_to_generation_params",
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side_effect=lambda generation_params, **kwargs: generation_params,
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create=True,
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):
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self.logger._log_langfuse_v2(
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user_id="user-1",
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metadata={
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"session_id": "session-999",
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"trace_id": "explicit-trace-id-777",
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},
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litellm_params={
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"metadata": {
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"session_id": "session-999",
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"trace_id": "explicit-trace-id-777",
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}
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},
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output=None,
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start_time=datetime.datetime.utcnow(),
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end_time=datetime.datetime.utcnow(),
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kwargs=kwargs,
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optional_params={},
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input=None,
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response_obj=None,
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level="DEFAULT",
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litellm_call_id="call-id-aaa",
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)
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# Explicit trace_id must take priority
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assert self.last_trace_kwargs.get("id") == "explicit-trace-id-777"
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# session_id must still be set for session grouping
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assert self.last_trace_kwargs.get("session_id") == "session-999"
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def test_failure_handler_langfuse_kwargs_excludes_original_response():
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"""
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Test that the Langfuse failure logging path passes the local kwargs copy
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(which excludes 'original_response') rather than self.model_call_details directly.
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This prevents passing coroutines or large response objects to the Langfuse logger.
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"""
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from litellm.litellm_core_utils.litellm_logging import Logging
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# Create a mock coroutine to simulate original_response
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mock_coroutine = MagicMock()
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mock_coroutine.__class__.__name__ = "coroutine"
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model_call_details = {
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"litellm_call_id": "test-call-id",
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"litellm_trace_id": None,
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"model": "gpt-4",
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"messages": [{"role": "user", "content": "test"}],
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"litellm_params": {
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"metadata": {"session_id": "test-session"},
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"litellm_session_id": None,
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},
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"original_response": mock_coroutine,
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"optional_params": {},
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"stream": False,
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"call_type": "completion",
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"input": [{"role": "user", "content": "test"}],
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}
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captured_kwargs = {}
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class MockLangfuseLogger:
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def log_event_on_langfuse(self, **log_kwargs):
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captured_kwargs.update(log_kwargs)
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return {"trace_id": "mock-trace-id", "generation_id": "mock-gen-id"}
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mock_logger = MockLangfuseLogger()
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# Simulate the failure path logic from litellm_logging.py
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# This mirrors lines 2937-2957 of the failure_handler
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kwargs = {}
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for k, v in model_call_details.items():
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if k != "original_response":
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kwargs[k] = v
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# Verify the local kwargs does NOT contain original_response
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assert "original_response" not in kwargs
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# Verify session_id is present in kwargs metadata
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assert kwargs["litellm_params"]["metadata"]["session_id"] == "test-session"
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# Call with the local kwargs (as the fix does)
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mock_logger.log_event_on_langfuse(
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start_time=datetime.datetime.utcnow(),
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end_time=datetime.datetime.utcnow(),
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response_obj=None,
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user_id=kwargs.get("user", None),
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status_message="TestError: something failed",
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level="ERROR",
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kwargs=kwargs,
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)
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# Verify original_response is NOT in the kwargs passed to Langfuse
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assert "original_response" not in captured_kwargs.get("kwargs", {})
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# Verify session_id metadata is preserved in the kwargs passed to Langfuse
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langfuse_metadata = captured_kwargs["kwargs"]["litellm_params"]["metadata"]
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assert langfuse_metadata["session_id"] == "test-session"
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def test_max_langfuse_clients_limit():
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"""
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Test that the max langfuse clients limit is respected when initializing multiple clients
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