162 lines
4.7 KiB
Python
162 lines
4.7 KiB
Python
#!/usr/bin/env python3
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"""
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MCP 测试服务器 - 简单的 Echo + 计算器
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通过 stdio 通信
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"""
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import json
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import sys
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from datetime import datetime
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def send_response(id: str, result: dict):
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"""发送 JSON-RPC 响应"""
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response = {
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"jsonrpc": "2.0",
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"id": id,
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"result": result
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}
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msg = json.dumps(response)
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sys.stdout.write(f"Content-Length: {len(msg)}\r\n\r\n{msg}")
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sys.stdout.flush()
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def send_error(id: str, code: int, message: str):
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"""发送错误响应"""
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response = {
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"jsonrpc": "2.0",
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"id": id,
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"error": {"code": code, "message": message}
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}
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msg = json.dumps(response)
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sys.stdout.write(f"Content-Length: {len(msg)}\r\n\r\n{msg}")
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sys.stdout.flush()
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def handle_request(request: dict):
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"""处理请求"""
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method = request.get("method", "")
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params = request.get("params", {})
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req_id = request.get("id", "0")
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if method == "initialize":
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send_response(req_id, {
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"protocolVersion": "2024-11-05",
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"capabilities": {
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"tools": {"listChanged": True}
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},
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"serverInfo": {
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"name": "test-mcp-server",
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"version": "1.0.0"
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}
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})
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elif method == "notifications/initialized":
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pass
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elif method == "tools/list":
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send_response(req_id, {
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"tools": [
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{
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"name": "echo",
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"description": "返回输入的消息",
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"inputSchema": {
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"type": "object",
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"properties": {
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"message": {"type": "string", "description": "要返回的消息"}
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},
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"required": ["message"]
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}
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},
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{
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"name": "add",
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"description": "两数相加",
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"inputSchema": {
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"type": "object",
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"properties": {
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"a": {"type": "number"},
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"b": {"type": "number"}
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},
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"required": ["a", "b"]
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}
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},
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{
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"name": "get_time",
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"description": "获取当前时间",
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"inputSchema": {"type": "object", "properties": {}}
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}
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]
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})
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elif method == "tools/call":
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tool_name = params.get("name", "")
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tool_args = params.get("arguments", {})
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if tool_name == "echo":
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msg = tool_args.get("message", "")
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send_response(req_id, {
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"content": [{"type": "text", "text": f"Echo: {msg}"}]
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})
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elif tool_name == "add":
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a = tool_args.get("a", 0)
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b = tool_args.get("b", 0)
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send_response(req_id, {
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"content": [{"type": "text", "text": str(a + b)}]
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})
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elif tool_name == "get_time":
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now = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
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send_response(req_id, {
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"content": [{"type": "text", "text": now}]
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})
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else:
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send_error(req_id, -32601, f"Unknown tool: {tool_name}")
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else:
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send_error(req_id, -32601, f"Unknown method: {method}")
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def main():
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"""主循环 - 读取 stdin，处理请求"""
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buffer = ""
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while True:
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try:
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line = sys.stdin.readline()
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if not line:
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break
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buffer += line
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if "Content-Length:" in buffer:
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parts = buffer.split("\r\n\r\n", 1)
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if len(parts) == 2:
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header, body = parts
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length = int(header.split(":")[1].strip())
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while len(body) < length:
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body += sys.stdin.read(length - len(body))
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request = json.loads(body[:length])
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handle_request(request)
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buffer = body[length:]
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elif buffer.strip().startswith("{"):
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try:
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request = json.loads(buffer.strip())
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handle_request(request)
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buffer = ""
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except json.JSONDecodeError:
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pass
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except Exception as e:
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sys.stderr.write(f"Error: {e}\n")
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sys.stderr.flush()
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if __name__ == "__main__":
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main()
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