feat: remove dependency of langchain

Signed-off-by: SuZhou-Joe <[email protected]>

common/utils/llm_chat/traces.ts

@@ -3,10 +3,6 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import { Run } from 'langchain/callbacks';
-import { AgentRun } from 'langchain/dist/callbacks/handlers/tracer';
-import _ from 'lodash';
-
 export interface AgentFrameworkTrace {
   interactionId: string;
   parentInteractionId: string;
@@ -16,62 +12,3 @@ export interface AgentFrameworkTrace {
   origin: string;
   traceNumber: number;
 }
-
-export interface LangchainTrace {
-  id: Run['id'];
-  parentRunId?: Run['parent_run_id'];
-  actions?: AgentRun['actions'];
-  type: Run['run_type'];
-  startTime: Run['start_time'];
-  name: string;
-  input: string;
-  output?: string;
-}
-
-const getValue = (obj: Record<string, string>, possibleKeys: string[]) => {
-  for (const key of possibleKeys) {
-    const value = _.get(obj, key);
-    if (value) return value;
-  }
-  return '';
-};
-
-/**
- * By default, tool traces have name 'DynamicTool'. Replace name for all tool
- * traces with the tool used in parent run actions.
- */
-const replaceToolNames = (traces: LangchainTrace[]) => {
-  return traces.map((trace) => ({
-    ...trace,
-    ...(trace.type === 'tool' && {
-      name: _.get(
-        traces.find((t) => t.id === trace.parentRunId),
-        'actions.0.tool',
-        trace.name
-      ),
-    }),
-  }));
-};
-
-const traverse = (runs: Array<Run | AgentRun>, traces: LangchainTrace[] = []) => {
-  traces.push(
-    ...runs.map((run) => ({
-      id: run.id,
-      parentRunId: run.parent_run_id,
-      type: run.run_type,
-      startTime: run.start_time,
-      name: run.name,
-      input: getValue(run.inputs, ['input', 'question', 'messages.0.0.kwargs.content']),
-      output: run.outputs && getValue(run.outputs, ['output', 'text', 'generations.0.0.text']),
-      ...('actions' in run && { actions: run.actions }),
-    }))
-  );
-  runs.forEach((run) => {
-    if (run.child_runs) traverse(run.child_runs, traces);
-  });
-  return traces;
-};
-
-export const convertToTraces = (runs: Run[]) => {
-  return replaceToolNames(traverse(runs));
-};

package.json

@@ -22,7 +22,6 @@
     "csv-parser": "^3.0.0",
     "dompurify": "^2.4.1",
     "jsdom": "^22.1.0",
-    "langchain": "^0.0.164",
     "postinstall": "^0.7.4",
     "web-streams-polyfill": "^3.2.1"
   },