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42c7b73 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 | import asyncio
from typing import Optional
from contextlib import AsyncExitStack
import anyio
from mcp import ClientSession
from mcp.client.auth import OAuthClientProvider, TokenStorage
from mcp.client.streamable_http import streamablehttp_client
from mcp.shared.auth import OAuthClientInformationFull, OAuthClientMetadata, OAuthToken
class MCPClient:
def __init__(self):
self.session: Optional[ClientSession] = None
self.exit_stack = None
async def connect(self, url: str, headers: Optional[dict] = None):
async with AsyncExitStack() as exit_stack:
try:
self._streams_context = streamablehttp_client(url, headers=headers)
transport = await exit_stack.enter_async_context(self._streams_context)
read_stream, write_stream, _ = transport
self._session_context = ClientSession(
read_stream, write_stream
) # pylint: disable=W0201
self.session = await exit_stack.enter_async_context(
self._session_context
)
with anyio.fail_after(10):
await self.session.initialize()
self.exit_stack = exit_stack.pop_all()
except Exception as e:
await asyncio.shield(self.disconnect())
raise e
async def list_tool_specs(self) -> Optional[dict]:
if not self.session:
raise RuntimeError("MCP client is not connected.")
result = await self.session.list_tools()
tools = result.tools
tool_specs = []
for tool in tools:
name = tool.name
description = tool.description
inputSchema = tool.inputSchema
# TODO: handle outputSchema if needed
outputSchema = getattr(tool, "outputSchema", None)
tool_specs.append(
{"name": name, "description": description, "parameters": inputSchema}
)
return tool_specs
async def call_tool(
self, function_name: str, function_args: dict
) -> Optional[dict]:
if not self.session:
raise RuntimeError("MCP client is not connected.")
result = await self.session.call_tool(function_name, function_args)
if not result:
raise Exception("No result returned from MCP tool call.")
result_dict = result.model_dump(mode="json")
result_content = result_dict.get("content", {})
if result.isError:
raise Exception(result_content)
else:
return result_content
async def list_resources(self, cursor: Optional[str] = None) -> Optional[dict]:
if not self.session:
raise RuntimeError("MCP client is not connected.")
result = await self.session.list_resources(cursor=cursor)
if not result:
raise Exception("No result returned from MCP list_resources call.")
result_dict = result.model_dump()
resources = result_dict.get("resources", [])
return resources
async def read_resource(self, uri: str) -> Optional[dict]:
if not self.session:
raise RuntimeError("MCP client is not connected.")
result = await self.session.read_resource(uri)
if not result:
raise Exception("No result returned from MCP read_resource call.")
result_dict = result.model_dump()
return result_dict
async def disconnect(self):
# Clean up and close the session
await self.exit_stack.aclose()
async def __aenter__(self):
await self.exit_stack.__aenter__()
return self
async def __aexit__(self, exc_type, exc_value, traceback):
await self.exit_stack.__aexit__(exc_type, exc_value, traceback)
await self.disconnect()
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