MCP Hot Update Server Demo

MCP Hot Update Server Demo

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This is a hot update server example based on the FastMCP framework, allowing dynamic loading and updating of utility functions without restarting the server.

Features

• Supports dynamic loading of utility functions
• Manage tools via JSON configuration files
• Real-time hot update capability
• Detailed error handling and logging

Key Code

exec(tool_code, globals(), local_namespace)
if inspect.isfunction(obj) and obj.__name__ in local_namespace:
     if found_func is not None:
          # Handle potential duplicate function definition if needed
          pass # Or log a warning, raise an error, etc.
     found_func = obj
if found_func:
     # Add the tool to MCP using the database name
     mcp.tool(
          name=tool_name, description=tool_description
     )(found_func)
     print(f"Successfully registered tool '{tool_name}'")

🚀 Quick Start

1️⃣ Environment Setup

Make sure you have Python 3.7+ installed. Then, install the required library:

$ pip install fastmcp

• fastmcp: Python implementation library for MCP.

2️⃣ Run MCP Server

$ python server.py

• The tools.json file format is as follows:

[
     {
          "name": "Tool Name",
          "description": "Tool Description",
          "code": "def function_name(params):\n    # Function implementation\n    return result"
     }
]

Security Notes

⚠️ Important Security Warning:

• The current implementation uses exec() to execute code read from the JSON file
• Additional security measures are required for production environments:
  • Code signature verification
  • Sandbox environment restrictions
  • Code review mechanisms
  • Access control

Development Suggestions

1. Test all utility functions in the development environment
2. Ensure the JSON file format is correct
3. Add appropriate error handling
4. Implement a code review process
5. Consider adding version control mechanisms

Workflow

graph TD
     A[Start Server] --> B[Load tools.json]
     B --> C{Parse JSON}
     C -->|Success| D[Iterate Tool List]
     C -->|Failure| E[Output Error Log]
     D --> F[Execute Tool Code]
     F --> G{Code Execution}
     G -->|Success| H[Register to MCP]
     G -->|Failure| I[Output Error Log]
     H --> J[Server Running]
     J --> K[Wait for New Requests]