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| 1 | +#!/usr/bin/env python3 |
| 2 | +""" |
| 3 | +Simple MCP streamable private gateway client example without authentication. |
| 4 | +
|
| 5 | +This client connects to an MCP server using streamable HTTP or SSE transport. |
| 6 | +
|
| 7 | +""" |
| 8 | + |
| 9 | +import asyncio |
| 10 | +import os |
| 11 | +from datetime import timedelta |
| 12 | +from typing import Any |
| 13 | + |
| 14 | +from mcp.client.session import ClientSession |
| 15 | +from mcp.client.streamable_http import streamablehttp_client |
| 16 | + |
| 17 | + |
| 18 | +class SimpleStreamablePrivateGateway: |
| 19 | + """Simple MCP streamable private gateway client without authentication.""" |
| 20 | + |
| 21 | + def __init__(self, server_url: str, server_hostname: str, transport_type: str = "streamable-http"): |
| 22 | + self.server_url = server_url |
| 23 | + self.server_hostname = server_hostname |
| 24 | + self.transport_type = transport_type |
| 25 | + self.session: ClientSession | None = None |
| 26 | + |
| 27 | + async def connect(self): |
| 28 | + """Connect to the MCP server.""" |
| 29 | + print(f"🔗 Attempting to connect to {self.server_url}...") |
| 30 | + |
| 31 | + try: |
| 32 | + print("📡 Opening StreamableHTTP transport connection...") |
| 33 | + # Note: terminate_on_close=False prevents SSL handshake failures during exit |
| 34 | + # Some servers may not handle session termination gracefully over SSL |
| 35 | + async with streamablehttp_client( |
| 36 | + url=self.server_url, |
| 37 | + headers={"Host": self.server_hostname}, |
| 38 | + extensions={"sni_hostname": self.server_hostname}, |
| 39 | + timeout=timedelta(seconds=60), |
| 40 | + terminate_on_close=False, # Skip session termination to avoid SSL errors |
| 41 | + ) as (read_stream, write_stream, get_session_id): |
| 42 | + await self._run_session(read_stream, write_stream, get_session_id) |
| 43 | + |
| 44 | + except Exception as e: |
| 45 | + print(f"❌ Failed to connect: {e}") |
| 46 | + import traceback |
| 47 | + |
| 48 | + traceback.print_exc() |
| 49 | + |
| 50 | + async def _run_session(self, read_stream, write_stream, get_session_id): |
| 51 | + """Run the MCP session with the given streams.""" |
| 52 | + print("🤝 Initializing MCP session...") |
| 53 | + async with ClientSession(read_stream, write_stream) as session: |
| 54 | + self.session = session |
| 55 | + print("⚡ Starting session initialization...") |
| 56 | + await session.initialize() |
| 57 | + print("✨ Session initialization complete!") |
| 58 | + |
| 59 | + print(f"\n✅ Connected to MCP server at {self.server_url}") |
| 60 | + if get_session_id: |
| 61 | + session_id = get_session_id() |
| 62 | + if session_id: |
| 63 | + print(f"Session ID: {session_id}") |
| 64 | + |
| 65 | + # Run interactive loop |
| 66 | + await self.interactive_loop() |
| 67 | + |
| 68 | + async def list_tools(self): |
| 69 | + """List available tools from the server.""" |
| 70 | + if not self.session: |
| 71 | + print("❌ Not connected to server") |
| 72 | + return |
| 73 | + |
| 74 | + try: |
| 75 | + result = await self.session.list_tools() |
| 76 | + if hasattr(result, "tools") and result.tools: |
| 77 | + print("\n📋 Available tools:") |
| 78 | + for i, tool in enumerate(result.tools, 1): |
| 79 | + print(f"{i}. {tool.name}") |
| 80 | + if tool.description: |
| 81 | + print(f" Description: {tool.description}") |
| 82 | + print() |
| 83 | + else: |
| 84 | + print("No tools available") |
| 85 | + except Exception as e: |
| 86 | + print(f"❌ Failed to list tools: {e}") |
| 87 | + |
| 88 | + async def call_tool(self, tool_name: str, arguments: dict[str, Any] | None = None): |
| 89 | + """Call a specific tool.""" |
| 90 | + if not self.session: |
| 91 | + print("❌ Not connected to server") |
| 92 | + return |
| 93 | + |
| 94 | + try: |
| 95 | + result = await self.session.call_tool(tool_name, arguments or {}) |
| 96 | + print(f"\n🔧 Tool '{tool_name}' result:") |
| 97 | + if hasattr(result, "content"): |
| 98 | + for content in result.content: |
| 99 | + if content.type == "text": |
| 100 | + print(content.text) |
| 101 | + else: |
| 102 | + print(content) |
| 103 | + else: |
| 104 | + print(result) |
| 105 | + except Exception as e: |
| 106 | + print(f"❌ Failed to call tool '{tool_name}': {e}") |
| 107 | + |
| 108 | + async def interactive_loop(self): |
| 109 | + """Run interactive command loop.""" |
| 110 | + print("\n🎯 Interactive Streamable Private Gateway") |
| 111 | + print("Commands:") |
| 112 | + print(" list - List available tools") |
| 113 | + print(" call <tool_name> [args] - Call a tool") |
| 114 | + print(" quit - Exit the client") |
| 115 | + print() |
| 116 | + |
| 117 | + while True: |
| 118 | + try: |
| 119 | + command = input("mcp> ").strip() |
| 120 | + |
| 121 | + if not command: |
| 122 | + continue |
| 123 | + |
| 124 | + if command == "quit": |
| 125 | + print("👋 Goodbye!") |
| 126 | + break |
| 127 | + |
| 128 | + elif command == "list": |
| 129 | + await self.list_tools() |
| 130 | + |
| 131 | + elif command.startswith("call "): |
| 132 | + parts = command.split(maxsplit=2) |
| 133 | + tool_name = parts[1] if len(parts) > 1 else "" |
| 134 | + |
| 135 | + if not tool_name: |
| 136 | + print("❌ Please specify a tool name") |
| 137 | + continue |
| 138 | + |
| 139 | + # Parse arguments (simple JSON-like format) |
| 140 | + arguments = {} |
| 141 | + if len(parts) > 2: |
| 142 | + import json |
| 143 | + |
| 144 | + try: |
| 145 | + arguments = json.loads(parts[2]) |
| 146 | + except json.JSONDecodeError: |
| 147 | + print("❌ Invalid arguments format (expected JSON)") |
| 148 | + continue |
| 149 | + |
| 150 | + await self.call_tool(tool_name, arguments) |
| 151 | + |
| 152 | + else: |
| 153 | + print("❌ Unknown command. Try 'list', 'call <tool_name>', or 'quit'") |
| 154 | + |
| 155 | + except KeyboardInterrupt: |
| 156 | + print("\n\n👋 Goodbye!") |
| 157 | + break |
| 158 | + except EOFError: |
| 159 | + print("\n👋 Goodbye!") |
| 160 | + break |
| 161 | + |
| 162 | + |
| 163 | +async def main(): |
| 164 | + """Main entry point.""" |
| 165 | + # Default server URL - can be overridden with environment variable |
| 166 | + # Most MCP streamable HTTP servers use /mcp as the endpoint |
| 167 | + server_port = os.getenv("MCP_SERVER_PORT", "8081") |
| 168 | + server_hostname = os.getenv("MCP_SERVER_HOSTNAME", "mcp.deepwiki.com") |
| 169 | + transport_type = "streamable-http" |
| 170 | + server_url = f"https://localhost:{server_port}/mcp" |
| 171 | + |
| 172 | + print("🚀 Simple Streamable Private Gateway") |
| 173 | + print(f"Connecting to: {server_url}") |
| 174 | + print(f"Server hostname: {server_hostname}") |
| 175 | + print(f"Transport type: {transport_type}") |
| 176 | + |
| 177 | + # Start connection flow |
| 178 | + client = SimpleStreamablePrivateGateway(server_url, server_hostname, transport_type) |
| 179 | + await client.connect() |
| 180 | + |
| 181 | + |
| 182 | +def cli(): |
| 183 | + """CLI entry point for uv script.""" |
| 184 | + asyncio.run(main()) |
| 185 | + |
| 186 | + |
| 187 | +if __name__ == "__main__": |
| 188 | + cli() |
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