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Add in-memory transport (#25)

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## Goal

Support running an MCP server in the same process as the client, while preserving MCP abstractions.

## Details

1. **(core change)** Adds a new `memory` transport module that enables in-process client-server communication.
This includes:
   - `create_client_server_memory_streams()` to create bidirectional memory streams
   - `create_connected_server_and_client_session()` to establish an in-process client-server connection

3. (minor) Enhances error handling and timeout support:
   - Adds configurable read timeouts to sessions via `read_timeout_seconds` parameter
   - Improves exception handling in the server with a new `raise_exceptions` flag to control whether errors are returned to clients or raised directly
   - Ensures proper cleanup of request context tokens in error cases

4. (minor) Makes server improvements:
   - Adds built-in ping handler support
This commit is contained in:
Nick Merrill 2024-11-05 18:42:41 -05:00 • committed by GitHub
commit 60e9c7a0d7
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1 changed files with 210 additions and 10 deletions
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mcp_python/types.py
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@ -141,16 +141,19 @@ class ErrorData(BaseModel):
code: int
"""The error type that occurred."""
message: str
"""
A short description of the error. The message SHOULD be limited to a concise single
sentence.
"""
data: Any | None = None
"""
Additional information about the error. The value of this member is defined by the
sender (e.g. detailed error information, nested errors etc.).
"""
model_config = ConfigDict(extra="allow")