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tracer_langchain.ts
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tracer_langchain.ts
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import { Client } from "langsmith";
import {
BaseRun,
RunCreate,
RunUpdate as BaseRunUpdate,
KVMap,
} from "langsmith/schemas";
import { getEnvironmentVariable, getRuntimeEnvironment } from "../utils/env.js";
import { BaseTracer } from "./base.js";
import { BaseCallbackHandlerInput } from "../callbacks/base.js";
export interface Run extends BaseRun {
id: string;
child_runs: this[];
child_execution_order: number;
}
export interface RunUpdate extends BaseRunUpdate {
events: BaseRun["events"];
inputs: KVMap;
}
export interface LangChainTracerFields extends BaseCallbackHandlerInput {
exampleId?: string;
projectName?: string;
client?: Client;
}
export class LangChainTracer
extends BaseTracer
implements LangChainTracerFields
{
name = "langchain_tracer";
projectName?: string;
exampleId?: string;
client: Client;
constructor(fields: LangChainTracerFields = {}) {
super(fields);
const { exampleId, projectName, client } = fields;
this.projectName =
projectName ??
getEnvironmentVariable("LANGCHAIN_PROJECT") ??
getEnvironmentVariable("LANGCHAIN_SESSION");
this.exampleId = exampleId;
this.client = client ?? new Client({});
}
private async _convertToCreate(
run: Run,
example_id: string | undefined = undefined
): Promise<RunCreate> {
return {
...run,
extra: {
...run.extra,
runtime: await getRuntimeEnvironment(),
},
child_runs: undefined,
session_name: this.projectName,
reference_example_id: run.parent_run_id ? undefined : example_id,
};
}
protected async persistRun(_run: Run): Promise<void> {}
protected async _persistRunSingle(run: Run): Promise<void> {
const persistedRun: RunCreate = await this._convertToCreate(
run,
this.exampleId
);
await this.client.createRun(persistedRun);
}
protected async _updateRunSingle(run: Run): Promise<void> {
const runUpdate: RunUpdate = {
end_time: run.end_time,
error: run.error,
outputs: run.outputs,
events: run.events,
inputs: run.inputs,
};
await this.client.updateRun(run.id, runUpdate);
}
async onRetrieverStart(run: Run): Promise<void> {
await this._persistRunSingle(run);
}
async onRetrieverEnd(run: Run): Promise<void> {
await this._updateRunSingle(run);
}
async onRetrieverError(run: Run): Promise<void> {
await this._updateRunSingle(run);
}
async onLLMStart(run: Run): Promise<void> {
await this._persistRunSingle(run);
}
async onLLMEnd(run: Run): Promise<void> {
await this._updateRunSingle(run);
}
async onLLMError(run: Run): Promise<void> {
await this._updateRunSingle(run);
}
async onChainStart(run: Run): Promise<void> {
await this._persistRunSingle(run);
}
async onChainEnd(run: Run): Promise<void> {
await this._updateRunSingle(run);
}
async onChainError(run: Run): Promise<void> {
await this._updateRunSingle(run);
}
async onToolStart(run: Run): Promise<void> {
await this._persistRunSingle(run);
}
async onToolEnd(run: Run): Promise<void> {
await this._updateRunSingle(run);
}
async onToolError(run: Run): Promise<void> {
await this._updateRunSingle(run);
}
}