LangChain.js

This module provides automatic instrumentation for LangChain.js, more specifically, the @langchain/core module. which may be used in conjunction with @opentelemetry/sdk-trace-node.

Install

npm install --save @arizeai/openinference-instrumentation-langchain

Setup

To load the LangChain instrumentation, manually instrument the @langchain/core/callbacks/manager module. The callbacks manager must be manually instrumented due to the non-traditional module structure in @langchain/core. Additional instrumentations can be registered as usual in the registerInstrumentations function.

import { NodeTracerProvider } from "@opentelemetry/sdk-trace-node";
import { 
  LangChainInstrumentation 
} from "@arizeai/openinference-instrumentation-langchain";
import * as CallbackManagerModule from "@langchain/core/callbacks/manager";

const provider = new NodeTracerProvider();
provider.register();

const lcInstrumentation = new LangChainInstrumentation();
// LangChain must be manually instrumented as it doesn't have 
// a traditional module structure
lcInstrumentation.manuallyInstrument(CallbackManagerModule);

Support

Instrumentation version >1.0.0 supports both attribute masking and context attribute propagation to spans.

Instrumentation Version	LangChain ^0.3.0	LangChain ^0.2.0	LangChain ^0.1.0
>1.0.0	✅	✅	✅
>0.2.0	❌	✅	✅
>0.1.0	❌	❌	✅

Resources

• Example project
• OpenInference package