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https://github.com/open-webui/mcpo
synced 2025-06-26 18:26:58 +00:00
feat: --config support
This commit is contained in:
Timothy Jaeryang Baek
parent
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vendored
@ -8,3 +8,4 @@ wheels/
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# Virtual environments
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.venv
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config.json
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@ -1,6 +1,6 @@
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[project]
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name = "mcpo"
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version = "0.0.4"
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version = "0.0.5"
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description = "A simple, secure MCP-to-OpenAPI proxy server"
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authors = [
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{ name = "Timothy Jaeryang Baek", email = "tim@openwebui.com" }
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@ -1,6 +1,9 @@
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import sys
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import asyncio
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import typer
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import os
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from typing_extensions import Annotated
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from typing import Optional, List
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@ -15,28 +18,67 @@ def main(
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port: Annotated[
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Optional[int], typer.Option("--port", "-p", help="Port number")
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] = 8000,
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env: Annotated[
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Optional[List[str]], typer.Option("--env", "-e", help="Environment variables")
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] = None,
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config: Annotated[
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Optional[str], typer.Option("--config", "-c", help="Config file path")
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] = None,
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name: Annotated[
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Optional[str], typer.Option("--name", "-n", help="Server name")
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] = None,
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description: Annotated[
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Optional[str], typer.Option("--description", "-d", help="Server description")
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] = None,
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version: Annotated[
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Optional[str], typer.Option("--version", "-v", help="Server version")
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] = None,
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):
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# Find the position of "--"
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if "--" not in sys.argv:
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typer.echo("Usage: mcpo --host 0.0.0.0 --port 8000 -- your_mcp_command")
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raise typer.Exit(1)
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server_command = None
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if not config:
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# Find the position of "--"
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if "--" not in sys.argv:
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typer.echo("Usage: mcpo --host 0.0.0.0 --port 8000 -- your_mcp_command")
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raise typer.Exit(1)
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idx = sys.argv.index("--")
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server_command: List[str] = sys.argv[idx + 1 :]
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idx = sys.argv.index("--")
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server_command: List[str] = sys.argv[idx + 1 :]
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if not server_command:
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typer.echo("Error: You must specify the MCP server command after '--'")
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return
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if not server_command:
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typer.echo("Error: You must specify the MCP server command after '--'")
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return
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from mcpo.main import run
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print(
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f"Starting MCP OpenAPI Proxy on {host}:{port} with command: {' '.join(server_command)}"
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)
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if config:
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print("Starting MCP OpenAPI Proxy with config file:", config)
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else:
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print(
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f"Starting MCP OpenAPI Proxy on {host}:{port} with command: {' '.join(server_command)}"
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)
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env_dict = {}
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if env:
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for var in env:
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key, value = env.split("=", 1)
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env_dict[key] = value
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# Set environment variables
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for key, value in env_dict.items():
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os.environ[key] = value
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# Run your async run function from mcpo.main
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asyncio.run(run(host, port, server_command))
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asyncio.run(
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run(
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host,
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port,
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config=config,
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name=name,
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description=description,
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version=version,
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server_command=server_command,
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)
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)
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if __name__ == "__main__":
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204
src/mcpo/main.py
204
src/mcpo/main.py
@ -1,54 +1,65 @@
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from fastapi import FastAPI, Body
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from fastapi.middleware.cors import CORSMiddleware
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from starlette.routing import Mount
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from pydantic import create_model
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from contextlib import AsyncExitStack, asynccontextmanager
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from mcp import ClientSession, StdioServerParameters, types
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from mcp.client.stdio import stdio_client
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import argparse
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import sys
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from typing import Dict, Any
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import asyncio
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from typing import Dict, Any, Callable
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import uvicorn
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import json
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import os
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async def create_dynamic_endpoints(app: FastAPI, session: ClientSession):
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def get_python_type(param_type: str):
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if param_type == "string":
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return str
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elif param_type == "integer":
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return int
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elif param_type == "boolean":
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return bool
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elif param_type == "number":
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return float
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elif param_type == "object":
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return Dict[str, Any]
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elif param_type == "array":
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return list
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else:
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return str # Fallback
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# Expand as needed. PRs welcome!
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async def create_dynamic_endpoints(app: FastAPI):
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session = app.state.session
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if not session:
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raise ValueError("Session is not initialized in the app state.")
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result = await session.initialize()
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server_info = getattr(result, "serverInfo", None)
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if server_info:
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app.title = server_info.name or app.title
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app.description = (
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f"{server_info.name} MCP Server" if server_info.name else app.description
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)
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app.version = server_info.version or app.version
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tools_result = await session.list_tools()
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tools = tools_result.tools
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for tool in tools:
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print(tool)
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endpoint_name = tool.name
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endpoint_description = tool.description
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schema = tool.inputSchema
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# Dynamically creating a Pydantic model for validation and openAPI coverage
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# Build Pydantic model
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model_fields = {}
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required_fields = schema.get("required", [])
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for param_name, param_schema in schema["properties"].items():
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param_type = param_schema["type"]
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param_type = param_schema.get("type", "string")
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param_desc = param_schema.get("description", "")
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python_type = str # default
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if param_type == "string":
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python_type = str
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elif param_type == "integer":
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python_type = int
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elif param_type == "boolean":
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python_type = bool
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elif param_type == "number":
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python_type = float
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elif param_type == "object":
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python_type = Dict[str, Any]
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elif param_type == "array":
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python_type = list
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# Expand as needed. PRs welcome!
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python_type = get_python_type(param_type)
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default_value = ... if param_name in required_fields else None
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model_fields[param_name] = (
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python_type,
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@ -57,18 +68,13 @@ async def create_dynamic_endpoints(app: FastAPI, session: ClientSession):
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FormModel = create_model(f"{endpoint_name}_form_model", **model_fields)
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def make_endpoint_func(endpoint_name: str, FormModel):
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async def tool(form_data: FormModel):
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def make_endpoint_func(endpoint_name: str, FormModel, session: ClientSession):
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async def tool_endpoint(form_data: FormModel):
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args = form_data.model_dump()
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print(f"Calling {endpoint_name} with arguments:", args)
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tool_call_result = await session.call_tool(
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endpoint_name, arguments=args
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)
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result = await session.call_tool(endpoint_name, arguments=args)
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response = []
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for content in tool_call_result.content:
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for content in result.content:
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text = content.text
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if isinstance(text, str):
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try:
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@ -76,14 +82,12 @@ async def create_dynamic_endpoints(app: FastAPI, session: ClientSession):
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except json.JSONDecodeError:
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pass
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response.append(text)
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return response
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return tool
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return tool_endpoint
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tool = make_endpoint_func(endpoint_name, FormModel)
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tool = make_endpoint_func(endpoint_name, FormModel, session)
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# Add endpoint to FastAPI with tool descriptions
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app.post(
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f"/{endpoint_name}",
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summary=endpoint_name.replace("_", " ").title(),
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@ -91,56 +95,94 @@ async def create_dynamic_endpoints(app: FastAPI, session: ClientSession):
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)(tool)
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async def run(host: str, port: int, server_command: list[str]):
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server_params = StdioServerParameters(
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command=server_command[0],
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args=server_command[1:],
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env={**os.environ},
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@asynccontextmanager
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async def lifespan(app: FastAPI):
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command = getattr(app.state, "command", None)
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args = getattr(app.state, "args", [])
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env = getattr(app.state, "env", {})
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if not command:
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async with AsyncExitStack() as stack:
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for route in app.routes:
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if isinstance(route, Mount) and isinstance(route.app, FastAPI):
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await stack.enter_async_context(
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route.app.router.lifespan_context(route.app), # noqa
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)
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yield
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else:
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server_params = StdioServerParameters(
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command=command,
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args=args,
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env={**env},
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)
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async with stdio_client(server_params) as (reader, writer):
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async with ClientSession(reader, writer) as session:
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app.state.session = session
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await create_dynamic_endpoints(app)
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yield
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async def run(host: str = "127.0.0.1", port: int = 8000, **kwargs):
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config_path = kwargs.get("config")
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server_command = kwargs.get("server_command")
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name = kwargs.get("name") or "MCP OpenAPI Proxy"
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description = (
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kwargs.get("description") or "Automatically generated API from MCP Tool Schemas"
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)
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version = kwargs.get("version") or "1.0"
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main_app = FastAPI(
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title=name, description=description, version=version, lifespan=lifespan
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)
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# Open connection to MCP first:
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async with stdio_client(server_params) as (read, write):
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async with ClientSession(read, write) as session:
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result = await session.initialize()
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main_app.add_middleware(
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CORSMiddleware,
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allow_origins=["*"],
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allow_credentials=True,
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allow_methods=["*"],
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allow_headers=["*"],
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)
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server_name = (
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result.serverInfo.name
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if hasattr(result, "serverInfo") and hasattr(result.serverInfo, "name")
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else None
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if server_command:
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main_app.state.command = server_command[0]
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main_app.state.args = server_command[1:]
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main_app.state.env = os.environ.copy()
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elif config_path:
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with open(config_path, "r") as f:
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config_data = json.load(f)
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mcp_servers = config_data.get("mcpServers", {})
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if not mcp_servers:
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raise ValueError("No 'mcpServers' found in config file.")
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for server_name, server_cfg in mcp_servers.items():
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sub_app = FastAPI(
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title=f"{server_name}",
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description=f"{server_name} MCP Server",
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version="1.0",
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lifespan=lifespan,
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)
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server_description = (
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f"{server_name.capitalize()} MCP OpenAPI Proxy"
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if server_name
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else "Automatically generated API endpoints based on MCP tool schemas."
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)
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server_version = (
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result.serverInfo.version
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if hasattr(result, "serverInfo")
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and hasattr(result.serverInfo, "version")
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else "1.0"
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)
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app = FastAPI(
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title=server_name if server_name else "MCP OpenAPI Proxy",
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description=server_description,
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version=server_version,
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)
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origins = ["*"]
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app.add_middleware(
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sub_app.add_middleware(
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CORSMiddleware,
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allow_origins=origins,
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allow_origins=["*"],
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allow_credentials=True,
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allow_methods=["*"],
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allow_headers=["*"],
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)
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# Dynamic endpoint creation
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await create_dynamic_endpoints(app, session)
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sub_app.state.command = server_cfg["command"]
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sub_app.state.args = server_cfg.get("args", [])
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sub_app.state.env = {**os.environ, **server_cfg.get("env", {})}
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config = uvicorn.Config(app=app, host=host, port=port, log_level="info")
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server = uvicorn.Server(config)
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await server.serve()
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main_app.mount(f"/{server_name}", sub_app)
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else:
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raise ValueError("You must provide either server_command or config.")
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config = uvicorn.Config(app=main_app, host=host, port=port, log_level="info")
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server = uvicorn.Server(config)
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await server.serve()
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