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Be able to inject trace_context into LangchainCallbackHandler #1419

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Be able to inject trace_context into LangchainCallbackHandler #1419

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43 changes: 32 additions & 11 deletions langfuse/langchain/CallbackHandler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@
LangfuseSpan,
LangfuseTool,
)
from langfuse.types import TraceContext
from langfuse._utils import _get_timestamp
from langfuse.langchain.utils import _extract_model_name
from langfuse.logger import langfuse_logger
Expand Down Expand Up @@ -92,7 +93,11 @@

class LangchainCallbackHandler(LangchainBaseCallbackHandler):
def __init__(
self, *, public_key: Optional[str] = None, update_trace: bool = False
self,
*,
public_key: Optional[str] = None,
update_trace: bool = False,
trace_context: Optional[TraceContext] = None,
) -> None:
"""Initialize the LangchainCallbackHandler.

Expand Down Expand Up @@ -120,6 +125,7 @@ def __init__(

self.last_trace_id: Optional[str] = None
self.update_trace = update_trace
self.trace_context = trace_context

def on_llm_new_token(
self,
Expand Down Expand Up @@ -299,16 +305,31 @@ def on_chain_start(
serialized, "chain", **kwargs
)

span = self._get_parent_observation(parent_run_id).start_observation(
name=span_name,
as_type=observation_type,
metadata=span_metadata,
input=inputs,
level=cast(
Optional[Literal["DEBUG", "DEFAULT", "WARNING", "ERROR"]],
span_level,
),
)
obs = self._get_parent_observation(parent_run_id)
if isinstance(obs, Langfuse):
span = obs.start_observation(
trace_context=self.trace_context,
name=span_name,
as_type=observation_type,
metadata=span_metadata,
input=inputs,
level=cast(
Literal["DEBUG", "DEFAULT", "WARNING", "ERROR"] | None,
span_level,
),
)
else:
span = obs.start_observation(
name=span_name,
as_type=observation_type,
metadata=span_metadata,
input=inputs,
level=cast(
Literal["DEBUG", "DEFAULT", "WARNING", "ERROR"] | None,
span_level,
),
)

self._attach_observation(run_id, span)

if parent_run_id is None:
Expand Down