Class RemoteLangChainRetriever

Specific implementation of the RemoteRetriever class designed to retrieve documents from a remote source using a JSON-based API. It implements the RemoteLangChainRetrieverParams interface which defines the keys used to interact with the JSON API.

Hierarchy

Implements

Constructors

Properties

asyncCaller: AsyncCaller

The authentication method to use, currently implemented is

  • false: no authentication
  • { bearer: string }: Bearer token authentication
headers: Record<string, string>
inputKey: string

The key in the JSON body to put the query in

metadataKey: string

The key in the JSON response to get the metadata from

pageContentKey: string

The key in the JSON response to get the page content from

responseKey: string

The key in the JSON response to get the response from

url: string

The URL of the remote retriever server

callbacks?: Callbacks
metadata?: Record<string, unknown>
tags?: string[]
verbose?: boolean
lc_runnable: boolean = true

Methods

  • Main method used to retrieve relevant documents. It takes a query string and an optional configuration object, and returns a promise that resolves to an array of Document objects. This method handles the retrieval process, including starting and ending callbacks, and error handling.

    Parameters

    • query: string

      The query string to retrieve relevant documents for.

    • Optional config: Callbacks | BaseCallbackConfig

      Optional configuration object for the retrieval process.

    Returns Promise<Document<Record<string, any>>[]>

    A promise that resolves to an array of Document objects.

  • Create a new runnable sequence that runs each individual runnable in series, piping the output of one runnable into another runnable or runnable-like.

    Type Parameters

    • NewRunOutput

    Parameters

    • coerceable: RunnableLike<Document<Record<string, any>>[], NewRunOutput>

      A runnable, function, or object whose values are functions or runnables.

    Returns RunnableSequence<string, Exclude<NewRunOutput, Error>>

    A new runnable sequence.

  • Stream all output from a runnable, as reported to the callback system. This includes all inner runs of LLMs, Retrievers, Tools, etc. Output is streamed as Log objects, which include a list of jsonpatch ops that describe how the state of the run has changed in each step, and the final state of the run. The jsonpatch ops can be applied in order to construct state.

    Parameters

    • input: string
    • Optional options: Partial<BaseCallbackConfig>
    • Optional streamOptions: Omit<LogStreamCallbackHandlerInput, "autoClose">

    Returns AsyncGenerator<RunLogPatch, any, unknown>

  • Default implementation of transform, which buffers input and then calls stream. Subclasses should override this method if they can start producing output while input is still being generated.

    Parameters

    Returns AsyncGenerator<Document<Record<string, any>>[], any, unknown>

  • Helper method to transform an Iterator of Input values into an Iterator of Output values, with callbacks. Use this to implement stream() or transform() in Runnable subclasses.

    Type Parameters

    • I extends string

    • O extends Document<Record<string, any>>[]

    Parameters

    • inputGenerator: AsyncGenerator<I, any, unknown>
    • transformer: ((generator, runManager?, options?) => AsyncGenerator<O, any, unknown>)
        • (generator, runManager?, options?): AsyncGenerator<O, any, unknown>
        • Parameters

          Returns AsyncGenerator<O, any, unknown>

    • Optional options: BaseCallbackConfig & {
          runType?: string;
      }

    Returns AsyncGenerator<O, any, unknown>

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