use-export-mcp.ts

Overview

The use-export-mcp.ts file defines a custom React hook, useExportMcp, which facilitates exporting MCP (likely "Model Control Parameters" or a similar domain-specific entity) data as a JSON file. This hook abstracts the process of requesting MCP data from a server and triggering the download of the retrieved data as a JSON file on the client side.

By encapsulating the export logic within a reusable hook, this file promotes clean separation of concerns and reusability in React components that need to implement MCP data export functionality.

Detailed Explanation

Hook: useExportMcp

Purpose

useExportMcp provides a callback function to export MCP data by sending a request to the server and downloading the resulting JSON data.

Return Value

An object with a single property:

• handleExportMcpJson: A function that accepts an array of MCP IDs (string[]) and returns an asynchronous event handler function. This returned function, when invoked, will perform the export operation and initiate a JSON file download if successful.

Implementation Details

• Internally, the hook uses another custom hook, useExportMcpServer, imported from @/hooks/use-mcp-request, which provides the method exportMcpServer to request MCP data from the backend.

• The export function is memoized using React.useCallback to ensure it maintains referential equality between renders unless exportMcpServer changes.

• Upon calling the export function with an array of IDs, it:

  1. Calls exportMcpServer(ids) to fetch MCP data.

  2. Awaits the response, which is expected to have the shape { code: number, data: any }.

  3. Checks if code === 0 indicating success.

  4. If successful, calls downloadJsonFile (from @/utils/file-util) to trigger the download of the JSON data as mcp.json.

Functions and Methods

useExportMcp() : { handleExportMcpJson: (ids: string[]) => () => Promise<void> }

• Parameters: None

• Returns: An object containing the handleExportMcpJson function.

handleExportMcpJson(ids: string[]) => () => Promise<void>

• Parameters:

  • ids (string[]): An array of MCP identifiers to be exported.

• Returns: A function that returns a Promise resolving after the export and download operation complete.

• Description: This function is intended to be used as an event handler or called imperatively. When executed, it fetches MCP data for the given IDs and downloads it as a JSON file.

Usage Example

import React from 'react';
import { useExportMcp } from './use-export-mcp';

function ExportButton() {
  const { handleExportMcpJson } = useExportMcp();

  const onClickExport = handleExportMcpJson(['id1', 'id2', 'id3']);

  return (
    <button onClick={onClickExport}>
      Export MCP Data
    </button>
  );
}

In the example above, clicking the button triggers the export of MCP data for the IDs 'id1', 'id2', and 'id3'. The data is then downloaded as mcp.json.

Important Implementation Details

• Asynchronous Handling: The export function is asynchronous, ensuring that the UI can handle loading states or errors elsewhere if needed.

• Dependency on useExportMcpServer: The hook depends on useExportMcpServer to perform the server request. This decouples the export logic from the data-fetching implementation.

• File Download: Uses the utility downloadJsonFile to convert the received data into a downloadable JSON file, abstracting away browser-specific file handling.

Interaction with Other Parts of the System

• useExportMcpServer Hook: This file relies on useExportMcpServer to communicate with the backend service. It likely encapsulates network requests or API calls related to MCP data.

• downloadJsonFile Utility: The file download functionality is abstracted into a utility, which handles creation of the JSON Blob and triggers the download in the browser.

• React Components: This hook is designed to be imported and used in React components that require exporting MCP data. It returns handlers suitable for UI event integration.

Mermaid Diagram: Hook Structure and Workflow

flowchart TD
    A[useExportMcp Hook] --> B[useExportMcpServer Hook]
    A --> C[handleExportMcpJson(ids)]

    C --> D[exportMcpServer(ids)]
    D --> E{Response code === 0?}
    E -- Yes --> F[downloadJsonFile(data, "mcp.json")]
    E -- No --> G[No action]

    style A fill:#f9f,stroke:#333,stroke-width:2px
    style B fill:#bbf,stroke:#333
    style C fill:#afa,stroke:#333
    style D fill:#ffd,stroke:#333
    style F fill:#dfd,stroke:#333
    style G fill:#fdd,stroke:#333

Summary

use-export-mcp.ts provides a lightweight, reusable hook for exporting MCP data as a JSON file by:

• Utilizing a server request hook to fetch MCP data.

• Providing a memoized callback to initiate export.

• Downloading the fetched data as mcp.json.

It cleanly separates concerns and integrates smoothly with React component event flows, helping developers implement MCP export functionality easily.