@langchain/core/dist/tracers/tracer_langchain.cjs.map

Core LangChain.js abstractions and schemas

{"version":3,"file":"tracer_langchain.cjs","names":["AIMessage","mergeUsageMetadata","BaseTracer","getDefaultLangChainClientSingleton","RunTree"],"sources":["../../src/tracers/tracer_langchain.ts"],"sourcesContent":["import {\n  type Client,\n  type LangSmithTracingClientInterface,\n  getDefaultProjectName,\n} from \"langsmith\";\nimport { RunTree, type RunTreeConfig } from \"langsmith/run_trees\";\nimport { getCurrentRunTree } from \"langsmith/singletons/traceable\";\n\nimport {\n  BaseRun,\n  RunCreate,\n  RunUpdate as BaseRunUpdate,\n  KVMap,\n} from \"langsmith/schemas\";\nimport { BaseTracer, Run as BaseTracerRun } from \"./base.js\";\nimport { BaseCallbackHandlerInput } from \"../callbacks/base.js\";\nimport { getDefaultLangChainClientSingleton } from \"../singletons/tracer.js\";\nimport { ChatGeneration } from \"../outputs.js\";\nimport { AIMessage } from \"../messages/ai.js\";\nimport { mergeUsageMetadata, UsageMetadata } from \"../messages/metadata.js\";\n\nexport interface Run extends BaseRun {\n  id: string;\n  child_runs: this[];\n  child_execution_order: number;\n  dotted_order?: string;\n  trace_id?: string;\n}\n\nexport interface RunCreate2 extends RunCreate {\n  trace_id?: string;\n  dotted_order?: string;\n}\n\nexport interface RunUpdate extends BaseRunUpdate {\n  events: BaseRun[\"events\"];\n  inputs: KVMap;\n  trace_id?: string;\n  dotted_order?: string;\n}\n\nexport interface LangChainTracerFields extends BaseCallbackHandlerInput {\n  exampleId?: string;\n  projectName?: string;\n  client?: LangSmithTracingClientInterface;\n  replicas?: RunTreeConfig[\"replicas\"];\n  metadata?: Record<string, unknown>;\n  tags?: string[];\n}\n\n/**\n * Keys that should be inherited from `tracerInheritableMetadata` even when\n * the run already has a value for them. This lets nested contexts\n * (e.g. a subagent invoked from inside a parent agent) override a\n * LangSmith-only tracing metadata value that was set by an ancestor.\n *\n * Keep this list very small: every key here loses the default\n * \"first wins\" protection and is always clobbered by the nearest\n * enclosing tracer config. Only keys that are strictly for LangSmith\n * tracing bookkeeping should be added.\n */\nexport const OVERRIDABLE_LANGSMITH_INHERITABLE_METADATA_KEYS = new Set<string>([\n  \"ls_agent_type\",\n]);\n\n/**\n * Extract usage_metadata from chat generations.\n *\n * Iterates through generations to find and aggregates all usage_metadata\n * found in chat messages. This is typically present in chat model outputs.\n */\nfunction _getUsageMetadataFromGenerations(\n  generations: ChatGeneration[][]\n): UsageMetadata | undefined {\n  let output: UsageMetadata | undefined = undefined;\n  for (const generationBatch of generations) {\n    for (const generation of generationBatch) {\n      if (\n        AIMessage.isInstance(generation.message) &&\n        generation.message.usage_metadata !== undefined\n      ) {\n        output = mergeUsageMetadata(output, generation.message.usage_metadata);\n      }\n    }\n  }\n  return output;\n}\n\nexport class LangChainTracer\n  extends BaseTracer\n  implements LangChainTracerFields\n{\n  name = \"langchain_tracer\";\n\n  projectName?: string;\n\n  exampleId?: string;\n\n  client: LangSmithTracingClientInterface;\n\n  replicas?: RunTreeConfig[\"replicas\"];\n\n  usesRunTreeMap = true;\n\n  tracingMetadata?: Record<string, unknown>;\n\n  tracingTags: string[] = [];\n\n  constructor(protected fields: LangChainTracerFields = {}) {\n    super(fields);\n    const { exampleId, projectName, client, replicas, metadata, tags } = fields;\n\n    this.projectName = projectName ?? getDefaultProjectName();\n    this.replicas = replicas;\n    this.exampleId = exampleId;\n    this.client = client ?? getDefaultLangChainClientSingleton();\n    this.tracingMetadata = metadata ? { ...metadata } : undefined;\n    this.tracingTags = tags ?? [];\n\n    const traceableTree = LangChainTracer.getTraceableRunTree();\n    if (traceableTree) {\n      this.updateFromRunTree(traceableTree);\n    }\n  }\n\n  protected async persistRun(_run: Run): Promise<void> {\n    // empty\n  }\n\n  async onRunCreate(run: Run): Promise<void> {\n    _patchMissingTracingDefaults(this, run);\n    if (!run.extra?.lc_defers_inputs) {\n      const runTree = this.getRunTreeWithTracingConfig(run.id);\n      await runTree?.postRun();\n    }\n  }\n\n  async onRunUpdate(run: Run): Promise<void> {\n    _patchMissingTracingDefaults(this, run);\n    const runTree = this.getRunTreeWithTracingConfig(run.id);\n    if (run.extra?.lc_defers_inputs) {\n      await runTree?.postRun();\n    } else {\n      await runTree?.patchRun();\n    }\n  }\n\n  onLLMEnd(run: BaseTracerRun): void {\n    // Extract usage_metadata from outputs and store in extra.metadata\n    const outputs = run.outputs as\n      | { generations?: ChatGeneration[][] }\n      | undefined;\n    if (outputs?.generations) {\n      const usageMetadata = _getUsageMetadataFromGenerations(\n        outputs.generations\n      );\n      if (usageMetadata !== undefined) {\n        run.extra = run.extra ?? {};\n        const metadata =\n          (run.extra.metadata as Record<string, unknown> | undefined) ?? {};\n        metadata.usage_metadata = usageMetadata;\n        run.extra.metadata = metadata;\n      }\n    }\n  }\n\n  copyWithTracingConfig({\n    metadata,\n    tags,\n  }: {\n    metadata?: Record<string, unknown>;\n    tags?: string[];\n  }): LangChainTracer {\n    let mergedMetadata: Record<string, unknown> | undefined;\n    if (metadata === undefined) {\n      mergedMetadata = this.tracingMetadata\n        ? { ...this.tracingMetadata }\n        : undefined;\n    } else if (this.tracingMetadata === undefined) {\n      mergedMetadata = { ...metadata };\n    } else {\n      mergedMetadata = { ...this.tracingMetadata };\n      for (const [key, value] of Object.entries(metadata)) {\n        // For allowlisted LangSmith-only inheritable metadata keys (e.g.\n        // `ls_agent_type`), nested callers are allowed to OVERRIDE the\n        // value inherited from an ancestor. For all other keys we keep\n        // the existing \"first wins\" behavior so that ancestor-provided\n        // tracing metadata is not accidentally clobbered by child runs.\n        if (\n          !Object.prototype.hasOwnProperty.call(mergedMetadata, key) ||\n          OVERRIDABLE_LANGSMITH_INHERITABLE_METADATA_KEYS.has(key)\n        ) {\n          mergedMetadata[key] = value;\n        }\n      }\n    }\n\n    const mergedTags = tags\n      ? Array.from(new Set([...this.tracingTags, ...tags]))\n      : [...this.tracingTags];\n\n    const copied = new LangChainTracer({\n      ...this.fields,\n      metadata: mergedMetadata,\n      tags: mergedTags,\n    });\n    copied.runMap = this.runMap;\n    copied.runTreeMap = this.runTreeMap;\n    return copied;\n  }\n\n  getRun(id: string): Run | undefined {\n    return this.runTreeMap.get(id);\n  }\n\n  updateFromRunTree(runTree: RunTree) {\n    this.runTreeMap.set(runTree.id, runTree);\n    let rootRun: RunTree = runTree;\n    const visited = new Set<string>();\n    while (rootRun.parent_run) {\n      if (visited.has(rootRun.id)) break;\n      visited.add(rootRun.id);\n\n      if (!rootRun.parent_run) break;\n      rootRun = rootRun.parent_run as RunTree;\n    }\n    visited.clear();\n\n    const queue = [rootRun];\n    while (queue.length > 0) {\n      const current = queue.shift();\n      if (!current || visited.has(current.id)) continue;\n      visited.add(current.id);\n\n      this.runTreeMap.set(current.id, current);\n      if (current.child_runs) {\n        queue.push(...current.child_runs);\n      }\n    }\n\n    this.client = runTree.client ?? this.client;\n    this.replicas = runTree.replicas ?? this.replicas;\n    this.projectName = runTree.project_name ?? this.projectName;\n    this.exampleId = runTree.reference_example_id ?? this.exampleId;\n    this.fields = {\n      ...this.fields,\n      client: this.client,\n      replicas: this.replicas,\n      projectName: this.projectName,\n      exampleId: this.exampleId,\n    };\n  }\n\n  getRunTreeWithTracingConfig(id: string): RunTree | undefined {\n    const runTree = this.runTreeMap.get(id);\n    if (!runTree) return undefined;\n\n    return new RunTree({\n      ...runTree,\n      client: this.client as Client,\n      project_name: this.projectName,\n      replicas: this.replicas,\n      reference_example_id: this.exampleId,\n      tracingEnabled: true,\n    });\n  }\n\n  static getTraceableRunTree(): RunTree | undefined {\n    try {\n      return (\n        // The type cast here provides forward compatibility. Old versions of LangSmith will just\n        // ignore the permitAbsentRunTree arg.\n        (\n          getCurrentRunTree as (\n            permitAbsentRunTree: boolean\n          ) => ReturnType<typeof getCurrentRunTree> | undefined\n        )(true)\n      );\n    } catch {\n      return undefined;\n    }\n  }\n\n  static [Symbol.hasInstance](instance: unknown): boolean {\n    if (typeof instance !== \"object\" || instance === null) {\n      return false;\n    }\n    const candidate = instance as Record<string, unknown>;\n    return (\n      \"name\" in candidate &&\n      candidate.name === \"langchain_tracer\" &&\n      \"copyWithTracingConfig\" in candidate &&\n      typeof candidate.copyWithTracingConfig === \"function\" &&\n      \"getRunTreeWithTracingConfig\" in candidate &&\n      typeof candidate.getRunTreeWithTracingConfig === \"function\"\n    );\n  }\n}\n\nfunction _patchMissingTracingDefaults(tracer: LangChainTracer, run: Run): void {\n  if (tracer.tracingMetadata) {\n    run.extra ??= {};\n    const metadata: Record<string, unknown> =\n      (run.extra.metadata as Record<string, unknown> | undefined) ?? {};\n    let didPatchMetadata = false;\n    for (const [key, value] of Object.entries(tracer.tracingMetadata)) {\n      // `OVERRIDABLE_LANGSMITH_INHERITABLE_METADATA_KEYS` are a small, LangSmith-only\n      // allowlist that bypasses the \"first wins\" merge so a nested caller\n      // (e.g. a subagent) can override a parent-set value.\n      if (\n        !Object.prototype.hasOwnProperty.call(metadata, key) ||\n        OVERRIDABLE_LANGSMITH_INHERITABLE_METADATA_KEYS.has(key)\n      ) {\n        if (metadata[key] !== value) {\n          metadata[key] = value;\n          didPatchMetadata = true;\n        }\n      }\n    }\n    if (didPatchMetadata) {\n      run.extra.metadata = metadata;\n    }\n  }\n\n  if (tracer.tracingTags.length > 0) {\n    run.tags = Array.from(\n      new Set([...(run.tags ?? 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