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tracer_langchain_v1.ts
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tracer_langchain_v1.ts
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import type { ChainValues } from "../utils/types.js";
import { type BaseMessage, getBufferString } from "../messages/index.js";
import type { LLMResult } from "../outputs.js";
import { getEnvironmentVariable } from "../utils/env.js";
import { BaseTracer, type RunType, type Run } from "./base.js";
export interface BaseRunV1 {
uuid: string;
parent_uuid?: string;
start_time: number;
end_time?: number;
execution_order: number;
child_execution_order: number;
serialized: { name: string };
session_id: number;
error?: string;
type: RunType;
}
export interface LLMRun extends BaseRunV1 {
prompts: string[];
response?: LLMResult;
}
export interface ChainRun extends BaseRunV1 {
inputs: ChainValues;
outputs?: ChainValues;
child_llm_runs: LLMRun[];
child_chain_runs: ChainRun[];
child_tool_runs: ToolRun[];
}
export interface ToolRun extends BaseRunV1 {
tool_input: string;
output?: string;
action: string;
child_llm_runs: LLMRun[];
child_chain_runs: ChainRun[];
child_tool_runs: ToolRun[];
}
export interface BaseTracerSession {
start_time: number;
name?: string;
}
export type TracerSessionCreate = BaseTracerSession;
export interface TracerSessionV1 extends BaseTracerSession {
id: number;
}
/** @deprecated Use LangChainTracer instead. */
export class LangChainTracerV1 extends BaseTracer {
name = "langchain_tracer";
protected endpoint =
getEnvironmentVariable("LANGCHAIN_ENDPOINT") || "http://localhost:1984";
protected headers: Record<string, string> = {
"Content-Type": "application/json",
};
protected session: TracerSessionV1;
constructor() {
super();
const apiKey = getEnvironmentVariable("LANGCHAIN_API_KEY");
if (apiKey) {
this.headers["x-api-key"] = apiKey;
}
}
async newSession(sessionName?: string): Promise<TracerSessionV1> {
const sessionCreate: TracerSessionCreate = {
start_time: Date.now(),
name: sessionName,
};
const session = await this.persistSession(sessionCreate);
this.session = session;
return session;
}
async loadSession(sessionName: string): Promise<TracerSessionV1> {
const endpoint = `${this.endpoint}/sessions?name=${sessionName}`;
return this._handleSessionResponse(endpoint);
}
async loadDefaultSession(): Promise<TracerSessionV1> {
const endpoint = `${this.endpoint}/sessions?name=default`;
return this._handleSessionResponse(endpoint);
}
protected async convertV2RunToRun(
run: Run
): Promise<LLMRun | ChainRun | ToolRun> {
const session = this.session ?? (await this.loadDefaultSession());
const serialized = run.serialized as { name: string };
let runResult: LLMRun | ChainRun | ToolRun;
if (run.run_type === "llm") {
const prompts: string[] = run.inputs.prompts
? run.inputs.prompts
: (run.inputs.messages as BaseMessage[][]).map((x) =>
getBufferString(x)
);
const llmRun: LLMRun = {
uuid: run.id,
start_time: run.start_time,
end_time: run.end_time,
execution_order: run.execution_order,
child_execution_order: run.child_execution_order,
serialized,
type: run.run_type,
session_id: session.id,
prompts,
response: run.outputs as LLMResult,
};
runResult = llmRun;
} else if (run.run_type === "chain") {
const child_runs = await Promise.all(
run.child_runs.map((child_run) => this.convertV2RunToRun(child_run))
);
const chainRun: ChainRun = {
uuid: run.id,
start_time: run.start_time,
end_time: run.end_time,
execution_order: run.execution_order,
child_execution_order: run.child_execution_order,
serialized,
type: run.run_type,
session_id: session.id,
inputs: run.inputs,
outputs: run.outputs,
child_llm_runs: child_runs.filter(
(child_run) => child_run.type === "llm"
) as LLMRun[],
child_chain_runs: child_runs.filter(
(child_run) => child_run.type === "chain"
) as ChainRun[],
child_tool_runs: child_runs.filter(
(child_run) => child_run.type === "tool"
) as ToolRun[],
};
runResult = chainRun;
} else if (run.run_type === "tool") {
const child_runs = await Promise.all(
run.child_runs.map((child_run) => this.convertV2RunToRun(child_run))
);
const toolRun: ToolRun = {
uuid: run.id,
start_time: run.start_time,
end_time: run.end_time,
execution_order: run.execution_order,
child_execution_order: run.child_execution_order,
serialized,
type: run.run_type,
session_id: session.id,
tool_input: run.inputs.input,
output: run.outputs?.output,
action: JSON.stringify(serialized),
child_llm_runs: child_runs.filter(
(child_run) => child_run.type === "llm"
) as LLMRun[],
child_chain_runs: child_runs.filter(
(child_run) => child_run.type === "chain"
) as ChainRun[],
child_tool_runs: child_runs.filter(
(child_run) => child_run.type === "tool"
) as ToolRun[],
};
runResult = toolRun;
} else {
throw new Error(`Unknown run type: ${run.run_type}`);
}
return runResult;
}
protected async persistRun(
run: Run | LLMRun | ChainRun | ToolRun
): Promise<void> {
let endpoint;
let v1Run: LLMRun | ChainRun | ToolRun;
if ((run as Run).run_type !== undefined) {
v1Run = await this.convertV2RunToRun(run as Run);
} else {
v1Run = run as LLMRun | ChainRun | ToolRun;
}
if (v1Run.type === "llm") {
endpoint = `${this.endpoint}/llm-runs`;
} else if (v1Run.type === "chain") {
endpoint = `${this.endpoint}/chain-runs`;
} else {
endpoint = `${this.endpoint}/tool-runs`;
}
const response = await fetch(endpoint, {
method: "POST",
headers: this.headers,
body: JSON.stringify(v1Run),
});
if (!response.ok) {
console.error(
`Failed to persist run: ${response.status} ${response.statusText}`
);
}
}
protected async persistSession(
sessionCreate: BaseTracerSession
): Promise<TracerSessionV1> {
const endpoint = `${this.endpoint}/sessions`;
const response = await fetch(endpoint, {
method: "POST",
headers: this.headers,
body: JSON.stringify(sessionCreate),
});
if (!response.ok) {
console.error(
`Failed to persist session: ${response.status} ${response.statusText}, using default session.`
);
return {
id: 1,
...sessionCreate,
};
}
return {
id: (await response.json()).id,
...sessionCreate,
};
}
protected async _handleSessionResponse(
endpoint: string
): Promise<TracerSessionV1> {
const response = await fetch(endpoint, {
method: "GET",
headers: this.headers,
});
let tracerSession: TracerSessionV1;
if (!response.ok) {
console.error(
`Failed to load session: ${response.status} ${response.statusText}`
);
tracerSession = {
id: 1,
start_time: Date.now(),
};
this.session = tracerSession;
return tracerSession;
}
const resp = (await response.json()) as TracerSessionV1[];
if (resp.length === 0) {
tracerSession = {
id: 1,
start_time: Date.now(),
};
this.session = tracerSession;
return tracerSession;
}
[tracerSession] = resp;
this.session = tracerSession;
return tracerSession;
}
}