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

Core LangChain.js abstractions and schemas

{"version":3,"file":"event_stream.cjs","names":["handler: BaseCallbackHandler","BaseTracer","fields?: EventStreamCallbackHandlerInput","IterableReadableStream","_run: Run","run: RunInfo","runId: string","outputStream: AsyncGenerator<T>","eventType: string","data: unknown","GenerationChunk","tappedPromiseResolver: (() => void) | undefined","event: StreamEvent","payload: StreamEvent","run: Run","token: string","kwargs?: { chunk: any }","AIMessageChunk","eventName: string","generations: ChatGeneration[][] | Generation[][] | undefined","output: BaseMessage | Record<string, any> | undefined","runInfo: RunInfo","eventData: StreamEventData","data: StreamEventData","data: any"],"sources":["../../src/tracers/event_stream.ts"],"sourcesContent":["import { BaseTracer, type Run } from \"./base.js\";\nimport {\n  BaseCallbackHandler,\n  BaseCallbackHandlerInput,\n  CallbackHandlerPrefersStreaming,\n} from \"../callbacks/base.js\";\nimport { IterableReadableStream } from \"../utils/stream.js\";\nimport { AIMessageChunk } from \"../messages/ai.js\";\nimport { ChatGeneration, Generation, GenerationChunk } from \"../outputs.js\";\nimport { BaseMessage } from \"../messages/base.js\";\n\n/**\n * Data associated with a StreamEvent.\n */\nexport type StreamEventData = {\n  /**\n   * The input passed to the runnable that generated the event.\n   * Inputs will sometimes be available at the *START* of the runnable, and\n   * sometimes at the *END* of the runnable.\n   * If a runnable is able to stream its inputs, then its input by definition\n   * won't be known until the *END* of the runnable when it has finished streaming\n   * its inputs.\n   */\n  // eslint-disable-next-line @typescript-eslint/no-explicit-any\n  input?: any;\n\n  /**\n   * The output of the runnable that generated the event.\n   * Outputs will only be available at the *END* of the runnable.\n   * For most runnables, this field can be inferred from the `chunk` field,\n   * though there might be some exceptions for special cased runnables (e.g., like\n   * chat models), which may return more information.\n   */\n  // eslint-disable-next-line @typescript-eslint/no-explicit-any\n  output?: any;\n\n  /**\n   * A streaming chunk from the output that generated the event.\n   * chunks support addition in general, and adding them up should result\n   * in the output of the runnable that generated the event.\n   */\n  // eslint-disable-next-line @typescript-eslint/no-explicit-any\n  chunk?: any;\n};\n\n/**\n * A streaming event.\n *\n * Schema of a streaming event which is produced from the streamEvents method.\n */\nexport type StreamEvent = {\n  /**\n   * Event names are of the format: on_[runnable_type]_(start|stream|end).\n   *\n   * Runnable types are one of:\n   * - llm - used by non chat models\n   * - chat_model - used by chat models\n   * - prompt --  e.g., ChatPromptTemplate\n   * - tool -- LangChain tools\n   * - chain - most Runnables are of this type\n   *\n   * Further, the events are categorized as one of:\n   * - start - when the runnable starts\n   * - stream - when the runnable is streaming\n   * - end - when the runnable ends\n   *\n   * start, stream and end are associated with slightly different `data` payload.\n   *\n   * Please see the documentation for `EventData` for more details.\n   */\n  event: string;\n  /** The name of the runnable that generated the event. */\n  name: string;\n  /**\n   * An randomly generated ID to keep track of the execution of the given runnable.\n   *\n   * Each child runnable that gets invoked as part of the execution of a parent runnable\n   * is assigned its own unique ID.\n   */\n  run_id: string;\n  /**\n   * Tags associated with the runnable that generated this event.\n   * Tags are always inherited from parent runnables.\n   */\n  tags?: string[];\n  /** Metadata associated with the runnable that generated this event. */\n  // eslint-disable-next-line @typescript-eslint/no-explicit-any\n  metadata: Record<string, any>;\n  /**\n   * Event data.\n   *\n   * The contents of the event data depend on the event type.\n   */\n  data: StreamEventData;\n};\n\ntype RunInfo = {\n  name: string;\n  tags: string[];\n  // eslint-disable-next-line @typescript-eslint/no-explicit-any\n  metadata: Record<string, any>;\n  runType: string;\n  // eslint-disable-next-line @typescript-eslint/no-explicit-any\n  inputs?: Record<string, any>;\n};\n\nexport interface EventStreamCallbackHandlerInput\n  extends BaseCallbackHandlerInput {\n  autoClose?: boolean;\n  includeNames?: string[];\n  includeTypes?: string[];\n  includeTags?: string[];\n  excludeNames?: string[];\n  excludeTypes?: string[];\n  excludeTags?: string[];\n}\n\nfunction assignName({\n  name,\n  serialized,\n}: {\n  name?: string;\n  // eslint-disable-next-line @typescript-eslint/no-explicit-any\n  serialized?: Record<string, any>;\n}): string {\n  if (name !== undefined) {\n    return name;\n  }\n  if (serialized?.name !== undefined) {\n    return serialized.name;\n  } else if (serialized?.id !== undefined && Array.isArray(serialized?.id)) {\n    return serialized.id[serialized.id.length - 1];\n  }\n  return \"Unnamed\";\n}\n\nexport const isStreamEventsHandler = (\n  handler: BaseCallbackHandler\n): handler is EventStreamCallbackHandler =>\n  handler.name === \"event_stream_tracer\";\n\n/**\n * Class that extends the `BaseTracer` class from the\n * `langchain.callbacks.tracers.base` module. It represents a callback\n * handler that logs the execution of runs and emits `RunLog` instances to a\n * `RunLogStream`.\n */\nexport class EventStreamCallbackHandler\n  extends BaseTracer\n  implements CallbackHandlerPrefersStreaming\n{\n  protected autoClose = true;\n\n  protected includeNames?: string[];\n\n  protected includeTypes?: string[];\n\n  protected includeTags?: string[];\n\n  protected excludeNames?: string[];\n\n  protected excludeTypes?: string[];\n\n  protected excludeTags?: string[];\n\n  private runInfoMap: Map<string, RunInfo> = new Map();\n\n  private tappedPromises: Map<string, Promise<void>> = new Map();\n\n  protected transformStream: TransformStream;\n\n  public writer: WritableStreamDefaultWriter;\n\n  public receiveStream: IterableReadableStream<StreamEvent>;\n\n  name = \"event_stream_tracer\";\n\n  lc_prefer_streaming = true;\n\n  constructor(fields?: EventStreamCallbackHandlerInput) {\n    super({ _awaitHandler: true, ...fields });\n    this.autoClose = fields?.autoClose ?? true;\n    this.includeNames = fields?.includeNames;\n    this.includeTypes = fields?.includeTypes;\n    this.includeTags = fields?.includeTags;\n    this.excludeNames = fields?.excludeNames;\n    this.excludeTypes = fields?.excludeTypes;\n    this.excludeTags = fields?.excludeTags;\n    this.transformStream = new TransformStream();\n    this.writer = this.transformStream.writable.getWriter();\n    this.receiveStream = IterableReadableStream.fromReadableStream(\n      this.transformStream.readable\n    );\n  }\n\n  [Symbol.asyncIterator]() {\n    return this.receiveStream;\n  }\n\n  protected async persistRun(_run: Run): Promise<void> {\n    // This is a legacy method only called once for an entire run tree\n    // and is therefore not useful here\n  }\n\n  _includeRun(run: RunInfo): boolean {\n    const runTags = run.tags ?? [];\n    let include =\n      this.includeNames === undefined &&\n      this.includeTags === undefined &&\n      this.includeTypes === undefined;\n    if (this.includeNames !== undefined) {\n      include = include || this.includeNames.includes(run.name);\n    }\n    if (this.includeTypes !== undefined) {\n      include = include || this.includeTypes.includes(run.runType);\n    }\n    if (this.includeTags !== undefined) {\n      include =\n        include ||\n        runTags.find((tag) => this.includeTags?.includes(tag)) !== undefined;\n    }\n    if (this.excludeNames !== undefined) {\n      include = include && !this.excludeNames.includes(run.name);\n    }\n    if (this.excludeTypes !== undefined) {\n      include = include && !this.excludeTypes.includes(run.runType);\n    }\n    if (this.excludeTags !== undefined) {\n      include =\n        include && runTags.every((tag) => !this.excludeTags?.includes(tag));\n    }\n    return include;\n  }\n\n  async *tapOutputIterable<T>(\n    runId: string,\n    outputStream: AsyncGenerator<T>\n  ): AsyncGenerator<T> {\n    const firstChunk = await outputStream.next();\n    if (firstChunk.done) {\n      return;\n    }\n    const runInfo = this.runInfoMap.get(runId);\n    // Run has finished, don't issue any stream events.\n    // An example of this is for runnables that use the default\n    // implementation of .stream(), which delegates to .invoke()\n    // and calls .onChainEnd() before passing it to the iterator.\n    if (runInfo === undefined) {\n      yield firstChunk.value;\n      return;\n    }\n    // Match format from handlers below\n    function _formatOutputChunk(eventType: string, data: unknown) {\n      if (eventType === \"llm\" && typeof data === \"string\") {\n        return new GenerationChunk({ text: data });\n      }\n      return data;\n    }\n    let tappedPromise = this.tappedPromises.get(runId);\n    // if we are the first to tap, issue stream events\n    if (tappedPromise === undefined) {\n      let tappedPromiseResolver: (() => void) | undefined;\n      tappedPromise = new Promise((resolve) => {\n        tappedPromiseResolver = resolve;\n      });\n      this.tappedPromises.set(runId, tappedPromise);\n      try {\n        const event: StreamEvent = {\n          event: `on_${runInfo.runType}_stream`,\n          run_id: runId,\n          name: runInfo.name,\n          tags: runInfo.tags,\n          metadata: runInfo.metadata,\n          data: {},\n        };\n        await this.send(\n          {\n            ...event,\n            data: {\n              chunk: _formatOutputChunk(runInfo.runType, firstChunk.value),\n            },\n          },\n          runInfo\n        );\n        yield firstChunk.value;\n        for await (const chunk of outputStream) {\n          // Don't yield tool and retriever stream events\n          if (runInfo.runType !== \"tool\" && runInfo.runType !== \"retriever\") {\n            await this.send(\n              {\n                ...event,\n                data: {\n                  chunk: _formatOutputChunk(runInfo.runType, chunk),\n                },\n              },\n              runInfo\n            );\n          }\n          yield chunk;\n        }\n      } finally {\n        tappedPromiseResolver?.();\n        // Don't delete from the promises map to keep track of which runs have been tapped.\n      }\n    } else {\n      // otherwise just pass through\n      yield firstChunk.value;\n      for await (const chunk of outputStream) {\n        yield chunk;\n      }\n    }\n  }\n\n  async send(payload: StreamEvent, run: RunInfo) {\n    if (this._includeRun(run)) {\n      await this.writer.write(payload);\n    }\n  }\n\n  async sendEndEvent(payload: StreamEvent, run: RunInfo) {\n    const tappedPromise = this.tappedPromises.get(payload.run_id);\n    if (tappedPromise !== undefined) {\n      // eslint-disable-next-line no-void\n      void tappedPromise.then(() => {\n        // eslint-disable-next-line no-void\n        void this.send(payload, run);\n      });\n    } else {\n      await this.send(payload, run);\n    }\n  }\n\n  async onLLMStart(run: Run): Promise<void> {\n    const runName = assignName(run);\n    const runType = run.inputs.messages !== undefined ? \"chat_model\" : \"llm\";\n    const runInfo = {\n      tags: run.tags ?? [],\n      metadata: run.extra?.metadata ?? {},\n      name: runName,\n      runType,\n      inputs: run.inputs,\n    };\n    this.runInfoMap.set(run.id, runInfo);\n    const eventName = `on_${runType}_start`;\n    await this.send(\n      {\n        event: eventName,\n        data: {\n          input: run.inputs,\n        },\n        name: runName,\n        tags: run.tags ?? [],\n        run_id: run.id,\n        metadata: run.extra?.metadata ?? {},\n      },\n      runInfo\n    );\n  }\n\n  async onLLMNewToken(\n    run: Run,\n    token: string,\n    // eslint-disable-next-line @typescript-eslint/no-explicit-any\n    kwargs?: { chunk: any }\n  ): Promise<void> {\n    const runInfo = this.runInfoMap.get(run.id);\n    let chunk;\n    let eventName;\n    if (runInfo === undefined) {\n      throw new Error(`onLLMNewToken: Run ID ${run.id} not found in run map.`);\n    }\n    // Top-level streaming events are covered by tapOutputIterable\n    if (this.runInfoMap.size === 1) {\n      return;\n    }\n    if (runInfo.runType === \"chat_model\") {\n      eventName = \"on_chat_model_stream\";\n      if (kwargs?.chunk === undefined) {\n        chunk = new AIMessageChunk({ content: token, id: `run-${run.id}` });\n      } else {\n        chunk = kwargs.chunk.message;\n      }\n    } else if (runInfo.runType === \"llm\") {\n      eventName = \"on_llm_stream\";\n      if (kwargs?.chunk === undefined) {\n        chunk = new GenerationChunk({ text: token });\n      } else {\n        chunk = kwargs.chunk;\n      }\n    } else {\n      throw new Error(`Unexpected run type ${runInfo.runType}`);\n    }\n    await this.send(\n      {\n        event: eventName,\n        data: {\n          chunk,\n        },\n        run_id: run.id,\n        name: runInfo.name,\n        tags: runInfo.tags,\n        metadata: runInfo.metadata,\n      },\n      runInfo\n    );\n  }\n\n  async onLLMEnd(run: Run): Promise<void> {\n    const runInfo = this.runInfoMap.get(run.id);\n    this.runInfoMap.delete(run.id);\n    let eventName: string;\n    if (runInfo === undefined) {\n      throw new Error(`onLLMEnd: Run ID ${run.id} not found in run map.`);\n    }\n    const generations: ChatGeneration[][] | Generation[][] | undefined =\n      run.outputs?.generations;\n    // eslint-disable-next-line @typescript-eslint/no-explicit-any\n    let output: BaseMessage | Record<string, any> | undefined;\n    if (runInfo.runType === \"chat_model\") {\n      for (const generation of generations ?? []) {\n        if (output !== undefined) {\n          break;\n        }\n        output = (generation[0] as ChatGeneration | undefined)?.message;\n      }\n      eventName = \"on_chat_model_end\";\n    } else if (runInfo.runType === \"llm\") {\n      output = {\n        generations: generations?.map((generation) => {\n          return generation.map((chunk) => {\n            return {\n              text: chunk.text,\n              generationInfo: chunk.generationInfo,\n            };\n          });\n        }),\n        llmOutput: run.outputs?.llmOutput ?? {},\n      };\n      eventName = \"on_llm_end\";\n    } else {\n      throw new Error(`onLLMEnd: Unexpected run type: ${runInfo.runType}`);\n    }\n    await this.sendEndEvent(\n      {\n        event: eventName,\n        data: {\n          output,\n          input: runInfo.inputs,\n        },\n        run_id: run.id,\n        name: runInfo.name,\n        tags: runInfo.tags,\n        metadata: runInfo.metadata,\n      },\n      runInfo\n    );\n  }\n\n  async onChainStart(run: Run): Promise<void> {\n    const runName = assignName(run);\n    const runType = run.run_type ?? \"chain\";\n    const runInfo: RunInfo = {\n      tags: run.tags ?? [],\n      metadata: run.extra?.metadata ?? {},\n      name: runName,\n      runType: run.run_type,\n    };\n    let eventData: StreamEventData = {};\n    // Workaround Runnable core code not sending input when transform streaming.\n    if (run.inputs.input === \"\" && Object.keys(run.inputs).length === 1) {\n      eventData = {};\n      runInfo.inputs = {};\n    } else if (run.inputs.input !== undefined) {\n      eventData.input = run.inputs.input;\n      runInfo.inputs = run.inputs.input;\n    } else {\n      eventData.input = run.inputs;\n      runInfo.inputs = run.inputs;\n    }\n    this.runInfoMap.set(run.id, runInfo);\n    await this.send(\n      {\n        event: `on_${runType}_start`,\n        data: eventData,\n        name: runName,\n        tags: run.tags ?? [],\n        run_id: run.id,\n        metadata: run.extra?.metadata ?? {},\n      },\n      runInfo\n    );\n  }\n\n  async onChainEnd(run: Run): Promise<void> {\n    const runInfo = this.runInfoMap.get(run.id);\n    this.runInfoMap.delete(run.id);\n    if (runInfo === undefined) {\n      throw new Error(`onChainEnd: Run ID ${run.id} not found in run map.`);\n    }\n    const eventName = `on_${run.run_type}_end`;\n    const inputs = run.inputs ?? runInfo.inputs ?? {};\n    const outputs = run.outputs?.output ?? run.outputs;\n    const data: StreamEventData = {\n      output: outputs,\n      input: inputs,\n    };\n    if (inputs.input && Object.keys(inputs).length === 1) {\n      data.input = inputs.input;\n      runInfo.inputs = inputs.input;\n    }\n    await this.sendEndEvent(\n      {\n        event: eventName,\n        data,\n        run_id: run.id,\n        name: runInfo.name,\n        tags: runInfo.tags,\n        metadata: runInfo.metadata ?? {},\n      },\n      runInfo\n    );\n  }\n\n  async onToolStart(run: Run): Promise<void> {\n    const runName = assignName(run);\n    const runInfo = {\n      tags: run.tags ?? [],\n      metadata: run.extra?.metadata ?? {},\n      name: runName,\n      runType: \"tool\",\n      inputs: run.inputs ?? {},\n    };\n    this.runInfoMap.set(run.id, runInfo);\n    await this.send(\n      {\n        event: \"on_tool_start\",\n        data: {\n          input: run.inputs ?? {},\n        },\n        name: runName,\n        run_id: run.id,\n        tags: run.tags ?? [],\n        metadata: run.extra?.metadata ?? {},\n      },\n      runInfo\n    );\n  }\n\n  async onToolEnd(run: Run): Promise<void> {\n    const runInfo = this.runInfoMap.get(run.id);\n    this.runInfoMap.delete(run.id);\n    if (runInfo === undefined) {\n      throw new Error(`onToolEnd: Run ID ${run.id} not found in run map.`);\n    }\n    if (runInfo.inputs === undefined) {\n      throw new Error(\n        `onToolEnd: Run ID ${run.id} is a tool call, and is expected to have traced inputs.`\n      );\n    }\n    const output =\n      run.outputs?.output === undefined ? run.outputs : run.outputs.output;\n    await this.sendEndEvent(\n      {\n        event: \"on_tool_end\",\n        data: {\n          output,\n          input: runInfo.inputs,\n        },\n        run_id: run.id,\n        name: runInfo.name,\n        tags: runInfo.tags,\n        metadata: runInfo.metadata,\n      },\n      runInfo\n    );\n  }\n\n  async onRetrieverStart(run: Run): Promise<void> {\n    const runName = assignName(run);\n    const runType = \"retriever\";\n    const runInfo = {\n      tags: run.tags ?? [],\n      metadata: run.extra?.metadata ?? {},\n      name: runName,\n      runType,\n      inputs: {\n        query: run.inputs.query,\n      },\n    };\n    this.runInfoMap.set(run.id, runInfo);\n    await this.send(\n      {\n        event: \"on_retriever_start\",\n        data: {\n          input: {\n            query: run.inputs.query,\n          },\n        },\n        name: runName,\n        tags: run.tags ?? [],\n        run_id: run.id,\n        metadata: run.extra?.metadata ?? {},\n      },\n      runInfo\n    );\n  }\n\n  async onRetrieverEnd(run: Run): Promise<void> {\n    const runInfo = this.runInfoMap.get(run.id);\n    this.runInfoMap.delete(run.id);\n    if (runInfo === undefined) {\n      throw new Error(`onRetrieverEnd: Run ID ${run.id} not found in run map.`);\n    }\n    await this.sendEndEvent(\n      {\n        event: \"on_retriever_end\",\n        data: {\n          output: run.outputs?.documents ?? run.outputs,\n          input: runInfo.inputs,\n        },\n        run_id: run.id,\n        name: runInfo.name,\n        tags: runInfo.tags,\n        metadata: runInfo.metadata,\n      },\n      runInfo\n    );\n  }\n\n  // eslint-disable-next-line @typescript-eslint/no-explicit-any\n  async handleCustomEvent(eventName: string, data: any, runId: string) {\n    const runInfo = this.runInfoMap.get(runId);\n    if (runInfo === undefined) {\n      throw new Error(\n        `handleCustomEvent: Run ID ${runId} not found in run map.`\n      );\n    }\n    await this.send(\n      {\n        event: \"on_custom_event\",\n        run_id: runId,\n        name: eventName,\n        tags: runInfo.tags,\n        metadata: runInfo.metadata,\n        data,\n      },\n      runInfo\n    );\n  }\n\n  async finish() {\n    const pendingPromises = [...this.tappedPromises.values()];\n    // eslint-disable-next-line no-void\n    void Promise.all(pendingPromises).finally(() => {\n      // eslint-disable-next-line no-void\n      void this.writer.close();\n    });\n  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