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| import asyncio
from typing import Optional
from contextlib import AsyncExitStack
import json
from mcp import ClientSession, StdioServerParameters
from mcp.client.stdio import stdio_client
from mcp.client.sse import sse_client
from mcp.client.streamable_http import streamablehttp_client
from dotenv import load_dotenv
import os, re
from openai import OpenAI
from lxml import etree
load_dotenv()
class MCPClient:
def __init__(self):
self.session: Optional[ClientSession] = None
self.exit_stack = AsyncExitStack()
self.API_KEY = os.getenv("API_KEY")
self.BASE_URL = os.getenv("BASE_URL")
self.MODEL = os.getenv("MODEL")
self.client = OpenAI(api_key=self.API_KEY, base_url=self.BASE_URL)
self.sessions = {}
self.messages = []
with open("./MCP_Prompt.txt", "r", encoding="utf-8") as file:
self.system_prompt = file.read()
async def mcp_json_config(self, mcp_json_file):
try:
with open(mcp_json_file, 'r') as f:
mcp_config: dict = json.load(f)
except json.JSONDecodeError:
raise ValueError("Invalid MCP config")
servers_config: dict = mcp_config.get('mcpServers', {})
for k, v in servers_config.items():
try:
if v.get('isActive', False) == False:
continue
print('-'*50)
mcp_name = v.get('name', k)
mcp_type: str = v.get('type', 'stdio')
if mcp_type.lower() == 'stdio':
command = v.get('command', None)
args = v.get('args', [])
env = v.get('env', {})
if command is None:
raise ValueError(f'{mcp_name} command is empty.')
if args == []:
raise ValueError(f'{mcp_name} args is empty.')
await self.connect_to_stdio_server(mcp_name, command, args, env)
elif mcp_type.lower() == 'sse':
server_url = v.get('url', None)
if server_url is None:
raise ValueError(f'{mcp_name} server_url is empty.')
await self.connect_to_sse_server(mcp_name, server_url)
elif mcp_type.lower() == 'streamable_http':
server_url = v.get('url', None)
if server_url is None:
raise ValueError(f'{mcp_name} server_url is empty.')
await self.connect_to_streamable_http_server(mcp_name, server_url)
else:
raise ValueError(f'{mcp_name} mcp type must in [stdio, sse, streamable_http].')
except Exception as e:
print(f"Error connecting to {mcp_name}: {e}")
async def connect_to_stdio_server(self, mcp_name, command: str, args: list[str], env: dict[str, str]={}):
server_params = StdioServerParameters(
command=command,
args=args,
env=env
)
stdio_transport = await self.exit_stack.enter_async_context(stdio_client(server_params))
self.stdio, self.write = stdio_transport
self.session = await self.exit_stack.enter_async_context(ClientSession(self.stdio, self.write))
self.sessions[mcp_name] = self.session
await self.session.initialize()
response = await self.session.list_tools()
available_tools = ['##' + mcp_name + '\n### Available Tools\n- ' + tool.name + "\n" + tool.description + "\n" + json.dumps(tool.inputSchema) for tool in response.tools]
self.system_prompt = self.system_prompt.replace("<$MCP_INFO$>", "\n".join(available_tools)+"\n<$MCP_INFO$>")
tools = response.tools
print(f"Successfully connected to {mcp_name} server with tools:", [tool.name for tool in tools])
async def connect_to_sse_server(self, mcp_name, server_url: str):
"""Connect to an MCP server
Args:
server_script_path: Path to the server script (.py or .js)
"""
stdio_transport = await self.exit_stack.enter_async_context(sse_client(server_url))
self.sse, self.write = stdio_transport
self.session = await self.exit_stack.enter_async_context(ClientSession(self.sse, self.write))
self.sessions[mcp_name] = self.session
await self.session.initialize()
response = await self.session.list_tools()
available_tools = ['##' + mcp_name + '\n### Available Tools\n- ' + tool.name + "\n" + tool.description + "\n" + json.dumps(tool.inputSchema) for tool in response.tools]
self.system_prompt = self.system_prompt.replace("<$MCP_INFO$>", "\n".join(available_tools)+"\n<$MCP_INFO$>\n")
tools = response.tools
print(f"Successfully connected to {mcp_name} server with tools:", [tool.name for tool in tools])
async def connect_to_streamable_http_server(self, mcp_name, server_url: str):
"""Connect to an MCP server
Args:
server_script_path: Path to the server script (.py or .js)
"""
stdio_transport = await self.exit_stack.enter_async_context(streamablehttp_client(server_url))
self.streamable_http, self.write, _ = stdio_transport
self.session = await self.exit_stack.enter_async_context(ClientSession(self.streamable_http, self.write))
self.sessions[mcp_name] = self.session
await self.session.initialize()
response = await self.session.list_tools()
available_tools = ['##' + mcp_name + '\n### Available Tools\n- ' + tool.name + "\n" + tool.description + "\n" + json.dumps(tool.inputSchema) for tool in response.tools]
self.system_prompt = self.system_prompt.replace("<$MCP_INFO$>", "\n".join(available_tools)+"\n<$MCP_INFO$>\n")
tools = response.tools
print(f"Successfully connected to {mcp_name} server with tools:", [tool.name for tool in tools])
async def process_query(self, query: str) -> str:
"""Process a query using Claude and available tools"""
self.messages.append(
{
"role": "system",
"content": self.system_prompt
}
)
self.messages.append(
{
"role": "user",
"content": query
}
)
response = self.client.chat.completions.create(
model=self.MODEL,
max_tokens=1024,
messages=self.messages
)
final_text = []
content = response.choices[0].message.content
if '<use_mcp_tool>' not in content:
final_text.append(content)
else:
server_name, tool_name, tool_args = self.parse_tool_string(content)
result = await self.sessions[server_name].call_tool(tool_name, tool_args)
print(f"[Calling tool {tool_name} with args {tool_args}]")
print("-"*40)
print("Server:", server_name)
print("Tool:", tool_name)
print("Args:", tool_args)
print("-"*40)
print("Result:", result.content[0].text)
print("-"*40)
self.messages.append({
"role": "assistant",
"content": content
})
self.messages.append({
"role": "user",
"content": f"[Tool {tool_name} \n returned: {result}]"
})
response = self.client.chat.completions.create(
model=self.MODEL,
max_tokens=1024,
messages=self.messages
)
final_text.append(response.choices[0].message.content)
return "\n".join(final_text)
def parse_tool_string(self, tool_string: str) -> tuple[str, str, dict]:
tool_string = re.findall("(<use_mcp_tool>.*?</use_mcp_tool>)", tool_string, re.S)[0]
root = etree.fromstring(tool_string)
server_name = root.find('server_name').text
tool_name = root.find('tool_name').text
try:
tool_args = json.loads(root.find('arguments').text)
except json.JSONDecodeError:
raise ValueError("Invalid tool arguments")
return server_name, tool_name, tool_args
async def chat_loop(self):
"""Run an interactive chat loop"""
print("\nMCP Client Started!")
print("Type your queries or 'quit' to exit.")
self.messages = []
while True:
try:
query = input("\nQuery: ").strip()
if query.lower() == 'quit':
break
if query.strip() == '':
print("Please enter a query.")
continue
response = await self.process_query(query)
print(response)
except Exception as e:
print(f"\nError: {str(e)}")
async def cleanup(self):
"""Clean up resources"""
await self.exit_stack.aclose()
async def main():
client = MCPClient()
try:
mcp_config_file = './mcp.json'
await client.mcp_json_config(mcp_config_file)
await client.chat_loop()
finally:
await client.cleanup()
if __name__ == "__main__":
asyncio.run(main())
|
