Switched langchain llm callbacks to use genai utils handler

instrumentation-genai/opentelemetry-instrumentation-langchain/CHANGELOG.md

@@ -7,5 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+- Added support to call genai utils handler for langchain LLM invocations.
+  ([https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3889](#3889))
+
 - Added span support for genAI langchain llm invocation.
   ([#3665](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3665))

instrumentation-genai/opentelemetry-instrumentation-langchain/examples/manual/README.rst

@@ -26,6 +26,8 @@ Next, set up a virtual environment like this:
     source .venv/bin/activate
     pip install "python-dotenv[cli]"
     pip install -r requirements.txt
+    pip install opentelemetry-instrumentation-langchain
+    pip install util/opentelemetry-util-genai (once opentelemetry-util-genai package is released remove it from here and add dependency in opentelemetry-instrumentation-langchain)
 
 Run
 ---

instrumentation-genai/opentelemetry-instrumentation-langchain/pyproject.toml

@@ -25,9 +25,7 @@ classifiers = [
   "Programming Language :: Python :: 3.13",
 ]
 dependencies = [
-  "opentelemetry-api >= 1.31.0",
   "opentelemetry-instrumentation ~= 0.57b0",
-  "opentelemetry-semantic-conventions ~= 0.57b0"
 ]
 
 [project.optional-dependencies]

instrumentation-genai/opentelemetry-instrumentation-langchain/src/opentelemetry/instrumentation/langchain/__init__.py

@@ -38,18 +38,16 @@
 
 from typing import Any, Callable, Collection
 
-from langchain_core.callbacks import BaseCallbackHandler  # type: ignore
+from langchain_core.callbacks import BaseCallbackHandler
 from wrapt import wrap_function_wrapper  # type: ignore
 
 from opentelemetry.instrumentation.instrumentor import BaseInstrumentor
 from opentelemetry.instrumentation.langchain.callback_handler import (
     OpenTelemetryLangChainCallbackHandler,
 )
 from opentelemetry.instrumentation.langchain.package import _instruments
-from opentelemetry.instrumentation.langchain.version import __version__
 from opentelemetry.instrumentation.utils import unwrap
-from opentelemetry.semconv.schemas import Schemas
-from opentelemetry.trace import get_tracer
+from opentelemetry.util.genai.handler import get_telemetry_handler
 
 
 class LangChainInstrumentor(BaseInstrumentor):
@@ -72,15 +70,12 @@ def _instrument(self, **kwargs: Any):
         Enable Langchain instrumentation.
         """
         tracer_provider = kwargs.get("tracer_provider")
-        tracer = get_tracer(
-            __name__,
-            __version__,
-            tracer_provider,
-            schema_url=Schemas.V1_37_0.value,
-        )
 
+        telemetry_handler = get_telemetry_handler(
+            tracer_provider=tracer_provider
+        )
         otel_callback_handler = OpenTelemetryLangChainCallbackHandler(
-            tracer=tracer,
+            telemetry_handler=telemetry_handler
         )
 
         wrap_function_wrapper(
@@ -109,7 +104,7 @@ def __init__(
     def __call__(
         self,
         wrapped: Callable[..., None],
-        instance: BaseCallbackHandler,  # type: ignore
+        instance: BaseCallbackHandler,
         args: tuple[Any, ...],
         kwargs: dict[str, Any],
     ):