47 lines
1.8 KiB
Python
47 lines
1.8 KiB
Python
from typing import Optional
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from mcp import ClientSession
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from mcp.client.auth import OAuthClientProvider
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from mcp.client.sse import sse_client
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from letta.functions.mcp_client.types import SSEServerConfig
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from letta.log import get_logger
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from letta.services.mcp.base_client import AsyncBaseMCPClient
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# see: https://modelcontextprotocol.io/quickstart/user
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MCP_CONFIG_TOPLEVEL_KEY = "mcpServers"
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logger = get_logger(__name__)
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# TODO: Get rid of Async prefix on this class name once we deprecate old sync code
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class AsyncSSEMCPClient(AsyncBaseMCPClient):
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def __init__(
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self, server_config: SSEServerConfig, oauth_provider: Optional[OAuthClientProvider] = None, agent_id: Optional[str] = None
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):
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super().__init__(server_config, oauth_provider, agent_id)
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async def _initialize_connection(self, server_config: SSEServerConfig) -> None:
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headers = {}
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if server_config.custom_headers:
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headers.update(server_config.custom_headers)
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if server_config.auth_header and server_config.auth_token:
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headers[server_config.auth_header] = server_config.auth_token
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if self.agent_id:
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headers[self.AGENT_ID_HEADER] = self.agent_id
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# Use OAuth provider if available, otherwise use regular headers
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if self.oauth_provider:
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sse_cm = sse_client(url=server_config.server_url, headers=headers if headers else None, auth=self.oauth_provider)
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else:
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sse_cm = sse_client(url=server_config.server_url, headers=headers if headers else None)
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sse_transport = await self.exit_stack.enter_async_context(sse_cm)
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self.stdio, self.write = sse_transport
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# Create and enter the ClientSession context manager
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session_cm = ClientSession(self.stdio, self.write)
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self.session = await self.exit_stack.enter_async_context(session_cm)
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