diff --git a/README.md b/README.md index 5dbc4bd9dd..5cbb6510f3 100644 --- a/README.md +++ b/README.md @@ -208,7 +208,7 @@ from contextlib import asynccontextmanager from dataclasses import dataclass from mcp.server.fastmcp import Context, FastMCP -from mcp.server.session import ServerSession +from mcp.server.transport_session import ServerTransportSession # Mock database class for example @@ -254,7 +254,7 @@ mcp = FastMCP("My App", lifespan=app_lifespan) # Access type-safe lifespan context in tools @mcp.tool() -def query_db(ctx: Context[ServerSession, AppContext]) -> str: +def query_db(ctx: Context[ServerTransportSession, AppContext]) -> str: """Tool that uses initialized resources.""" db = ctx.request_context.lifespan_context.db return db.query() @@ -326,13 +326,13 @@ Tools can optionally receive a Context object by including a parameter with the ```python from mcp.server.fastmcp import Context, FastMCP -from mcp.server.session import ServerSession +from mcp.server.transport_session import ServerTransportSession mcp = FastMCP(name="Progress Example") @mcp.tool() -async def long_running_task(task_name: str, ctx: Context[ServerSession, None], steps: int = 5) -> str: +async def long_running_task(task_name: str, ctx: Context[ServerTransportSession, None], steps: int = 5) -> str: """Execute a task with progress updates.""" await ctx.info(f"Starting: {task_name}") @@ -674,13 +674,13 @@ The Context object provides the following capabilities: ```python from mcp.server.fastmcp import Context, FastMCP -from mcp.server.session import ServerSession +from mcp.server.transport_session import ServerTransportSession mcp = FastMCP(name="Progress Example") @mcp.tool() -async def long_running_task(task_name: str, ctx: Context[ServerSession, None], steps: int = 5) -> str: +async def long_running_task(task_name: str, ctx: Context[ServerTransportSession, None], steps: int = 5) -> str: """Execute a task with progress updates.""" await ctx.info(f"Starting: {task_name}") @@ -798,7 +798,7 @@ Request additional information from users. This example shows an Elicitation dur from pydantic import BaseModel, Field from mcp.server.fastmcp import Context, FastMCP -from mcp.server.session import ServerSession +from mcp.server.transport_session import ServerTransportSession mcp = FastMCP(name="Elicitation Example") @@ -814,7 +814,7 @@ class BookingPreferences(BaseModel): @mcp.tool() -async def book_table(date: str, time: str, party_size: int, ctx: Context[ServerSession, None]) -> str: +async def book_table(date: str, time: str, party_size: int, ctx: Context[ServerTransportSession, None]) -> str: """Book a table with date availability check.""" # Check if date is available if date == "2024-12-25": @@ -888,13 +888,13 @@ Tools can send logs and notifications through the context: ```python from mcp.server.fastmcp import Context, FastMCP -from mcp.server.session import ServerSession +from mcp.server.transport_session import ServerTransportSession mcp = FastMCP(name="Notifications Example") @mcp.tool() -async def process_data(data: str, ctx: Context[ServerSession, None]) -> str: +async def process_data(data: str, ctx: Context[ServerTransportSession, None]) -> str: """Process data with logging.""" # Different log levels await ctx.debug(f"Debug: Processing '{data}'") @@ -2037,7 +2037,7 @@ import os from pydantic import AnyUrl -from mcp import ClientSession, StdioServerParameters, types +from mcp import ClientSession, ClientTransportSession, StdioServerParameters, types from mcp.client.stdio import stdio_client from mcp.shared.context import RequestContext @@ -2051,7 +2051,7 @@ server_params = StdioServerParameters( # Optional: create a sampling callback async def handle_sampling_message( - context: RequestContext[ClientSession, None], params: types.CreateMessageRequestParams + context: RequestContext[ClientTransportSession, None], params: types.CreateMessageRequestParams ) -> types.CreateMessageResult: print(f"Sampling request: {params.messages}") return types.CreateMessageResult( @@ -2167,7 +2167,7 @@ cd to the `examples/snippets` directory and run: import asyncio import os -from mcp import ClientSession, StdioServerParameters +from mcp import ClientSession, ClientTransportSession, StdioServerParameters from mcp.client.stdio import stdio_client from mcp.shared.metadata_utils import get_display_name @@ -2179,7 +2179,7 @@ server_params = StdioServerParameters( ) -async def display_tools(session: ClientSession): +async def display_tools(session: ClientTransportSession): """Display available tools with human-readable names""" tools_response = await session.list_tools() @@ -2191,7 +2191,7 @@ async def display_tools(session: ClientSession): print(f" {tool.description}") -async def display_resources(session: ClientSession): +async def display_resources(session: ClientTransportSession): """Display available resources with human-readable names""" resources_response = await session.list_resources() diff --git a/docs/experimental/grpc-streaming.md b/docs/experimental/grpc-streaming.md new file mode 100644 index 0000000000..ce26c9ec36 --- /dev/null +++ b/docs/experimental/grpc-streaming.md @@ -0,0 +1,102 @@ +# Advanced gRPC Streaming & Multiplexing in MCP + +The gRPC transport for the Model Context Protocol (MCP) unlocks high-performance patterns that are difficult or inefficient to achieve with standard JSON-RPC over HTTP/1.1 or Stdio. This document explores advanced architectural patterns enabled by native bidirectional streaming and binary Protobuf serialization. + +## 1. The "Worker-Orchestrator" Pattern (Parallel Analysis) + +In complex agentic workflows, an orchestrator agent often needs to delegate sub-tasks to multiple workers. With gRPC's multiplexed `Session` stream, a single connection can handle dozens of concurrent tool calls, streaming results back as they are completed. + +### Scenario: Large Document Analysis +Imagine analyzing a 500-page technical specification. Instead of sequential processing, the orchestrator "chunks" the document and sends parallel requests to worker tools. + +```mermaid +sequenceDiagram + participant O as Orchestrator Agent + participant S as MCP gRPC Server + participant W as Worker Tools (Parallel) + + O->>S: Session(CallToolRequest: AnalyzeChapter1) + O->>S: Session(CallToolRequest: AnalyzeChapter2) + O->>S: Session(CallToolRequest: AnalyzeChapter3) + + Note over S,W: Tools execute in parallel threads/processes + + S->>O: Session(CallToolResponse: Chapter 2 Results) + S->>O: Session(ProgressNotification: Chapter 1 - 50%) + S->>O: Session(CallToolResponse: Chapter 3 Results) + S->>O: Session(CallToolResponse: Chapter 1 Results) +``` + +### The Advantage +* **Interleaved Responses**: Results are returned in the order they complete, not the order they were requested. +* **Low Latency**: No waiting for the TCP handshake or HTTP overhead for each sub-task. + +--- + +## 2. Binary Streaming (Large Files & Media) + +Legacy MCP transports must Base64 encode binary data, adding ~33% overhead to every transfer. gRPC uses raw `bytes`, making it the ideal choice for media-rich or data-intensive applications. + +### Scenario: Video Frame Analysis +An agent monitoring a security feed can stream raw video chunks. By using `ReadResourceChunked`, the agent can begin processing the first few seconds of video while the rest is still being transmitted. + +### Key Benefits: +* **Zero-Base64**: Transfer 10MB of video as 10MB of binary data, not 13.5MB of text. +* **Memory Efficiency**: Use `ReadResourceChunked` to process files that are larger than the available RAM by handling one 4MB chunk at a time. + +```python +# Example: Streaming a large resource in chunks +from mcp.client.grpc import GrpcClientTransport + +async def main(): + async with GrpcClientTransport("localhost:50051") as transport: + # Under the hood, this uses the ReadResourceChunked streaming RPC + result = await transport.read_resource("file://large_video_dump.bin") + # Process chunks as they arrive (internal implementation handles aggregation) +``` + +--- + +## 3. Real-Time "Push" Notifications (Watchers) + +Instead of polling a server every few seconds to see if a file has changed ("Are we there yet?"), gRPC enables the server to "push" updates immediately using the `WatchResources` RPC. + +### Scenario: Live Log Tailing +An agent can "watch" a server log. As soon as an error is written to the disk, the MCP server pushes a notification over the persistent gRPC stream. + +```mermaid +graph TD + A[MCP Server] -- "WatchResourcesResponse" --> B(Persistent gRPC Stream) + B --> C[AI Agent] + subgraph "Server Side" + D[Log File] -- "Inotify / File System Event" --> A + end + C -- "Immediate Reaction" --> E[Analyze Error] +``` + +--- + +## 4. Progressive Tool Results + +For long-running tools (e.g., "Run Integration Tests"), gRPC allows the server to stream progress updates and partial results. + +### Example: Test Runner +1. **Agent** calls `RunTests`. +2. **Server** streams `ProgressNotification` for each test case: "Test 1/50 Passed", "Test 2/50 Passed". +3. **Agent** sees "Test 3/50 FAILED" and decides to **Cancel** the remaining tests immediately via `CancelRequest` to save compute resources. + +--- + +## Performance Comparison: JSON-RPC vs. gRPC + +| Feature | JSON-RPC (HTTP/1.1) | gRPC (HTTP/2) | Benefit | +| :--- | :--- | :--- | :--- | +| **Serialization** | Text (JSON) | Binary (Protobuf) | 10x faster, smaller payloads | +| **Binary Data** | Base64 (Slow) | Raw `bytes` (Native) | 33% less bandwidth, lower CPU | +| **Concurrency** | Sequential / Multiple Conns | Multiplexed (1 Conn) | Lower resource usage | +| **Streaming** | Simulated (SSE/Long-poll) | Native Bidirectional | True real-time interaction | + +## Best Practices +1. **Use `Session` for Multiplexing**: If you are performing many small operations, use the `Session` stream to avoid the overhead of multiple unary calls. +2. **Set Chunk Sizes**: When using `ReadResourceChunked`, balance chunk size (default 4MB) with your network's MTU and memory constraints. +3. **Implement Cancellation**: Always handle `CancelRequest` on the server side to stop expensive operations if the agent loses interest. diff --git a/docs/index.md b/docs/index.md index 139afca4aa..dd4f5a2c24 100644 --- a/docs/index.md +++ b/docs/index.md @@ -49,8 +49,10 @@ uv run mcp dev server.py 1. **[Install](installation.md)** the MCP SDK 2. **[Learn concepts](concepts.md)** - understand the three primitives and architecture -3. **[Explore authorization](authorization.md)** - add security to your servers -4. **[Use low-level APIs](low-level-server.md)** - for advanced customization +3. **[gRPC Transport (Experimental)](../proto/README.md)** - high-performance binary transport +4. **[Streaming & Multiplexing](experimental/grpc-streaming.md)** - advanced gRPC patterns +5. **[Explore authorization](authorization.md)** - add security to your servers +6. **[Use low-level APIs](low-level-server.md)** - for advanced customization ## API Reference diff --git a/examples/clients/simple-auth-client/mcp_simple_auth_client/main.py b/examples/clients/simple-auth-client/mcp_simple_auth_client/main.py index 5987a878ef..6c7201e044 100644 --- a/examples/clients/simple-auth-client/mcp_simple_auth_client/main.py +++ b/examples/clients/simple-auth-client/mcp_simple_auth_client/main.py @@ -17,7 +17,7 @@ from urllib.parse import parse_qs, urlparse from mcp.client.auth import OAuthClientProvider, TokenStorage -from mcp.client.session import ClientSession +from mcp.client.session import ClientSession, ClientTransportSession from mcp.client.sse import sse_client from mcp.client.streamable_http import streamablehttp_client from mcp.shared.auth import OAuthClientInformationFull, OAuthClientMetadata, OAuthToken @@ -153,7 +153,7 @@ class SimpleAuthClient: def __init__(self, server_url: str, transport_type: str = "streamable-http"): self.server_url = server_url self.transport_type = transport_type - self.session: ClientSession | None = None + self.session: ClientTransportSession | None = None async def connect(self): """Connect to the MCP server.""" diff --git a/examples/clients/simple-chatbot/mcp_simple_chatbot/main.py b/examples/clients/simple-chatbot/mcp_simple_chatbot/main.py index 78a81a4d9f..3a9d201b17 100644 --- a/examples/clients/simple-chatbot/mcp_simple_chatbot/main.py +++ b/examples/clients/simple-chatbot/mcp_simple_chatbot/main.py @@ -10,6 +10,7 @@ from dotenv import load_dotenv from mcp import ClientSession, StdioServerParameters from mcp.client.stdio import stdio_client +from mcp.client.transport_session import ClientTransportSession # Configure logging logging.basicConfig(level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s") @@ -67,7 +68,7 @@ def __init__(self, name: str, config: dict[str, Any]) -> None: self.name: str = name self.config: dict[str, Any] = config self.stdio_context: Any | None = None - self.session: ClientSession | None = None + self.session: ClientTransportSession | None = None self._cleanup_lock: asyncio.Lock = asyncio.Lock() self.exit_stack: AsyncExitStack = AsyncExitStack() diff --git a/examples/snippets/clients/display_utilities.py b/examples/snippets/clients/display_utilities.py index 5f1d50510d..b8ad7dffc2 100644 --- a/examples/snippets/clients/display_utilities.py +++ b/examples/snippets/clients/display_utilities.py @@ -6,7 +6,7 @@ import asyncio import os -from mcp import ClientSession, StdioServerParameters +from mcp import ClientSession, ClientTransportSession, StdioServerParameters from mcp.client.stdio import stdio_client from mcp.shared.metadata_utils import get_display_name @@ -18,7 +18,7 @@ ) -async def display_tools(session: ClientSession): +async def display_tools(session: ClientTransportSession): """Display available tools with human-readable names""" tools_response = await session.list_tools() @@ -30,7 +30,7 @@ async def display_tools(session: ClientSession): print(f" {tool.description}") -async def display_resources(session: ClientSession): +async def display_resources(session: ClientTransportSession): """Display available resources with human-readable names""" resources_response = await session.list_resources() diff --git a/examples/snippets/clients/stdio_client.py b/examples/snippets/clients/stdio_client.py index ac978035d4..90f9fdff9b 100644 --- a/examples/snippets/clients/stdio_client.py +++ b/examples/snippets/clients/stdio_client.py @@ -8,7 +8,7 @@ from pydantic import AnyUrl -from mcp import ClientSession, StdioServerParameters, types +from mcp import ClientSession, ClientTransportSession, StdioServerParameters, types from mcp.client.stdio import stdio_client from mcp.shared.context import RequestContext @@ -22,7 +22,7 @@ # Optional: create a sampling callback async def handle_sampling_message( - context: RequestContext[ClientSession, None], params: types.CreateMessageRequestParams + context: RequestContext[ClientTransportSession, None], params: types.CreateMessageRequestParams ) -> types.CreateMessageResult: print(f"Sampling request: {params.messages}") return types.CreateMessageResult( diff --git a/examples/snippets/servers/elicitation.py b/examples/snippets/servers/elicitation.py index 2c8a3b35ac..45f2cb68b9 100644 --- a/examples/snippets/servers/elicitation.py +++ b/examples/snippets/servers/elicitation.py @@ -1,7 +1,7 @@ from pydantic import BaseModel, Field from mcp.server.fastmcp import Context, FastMCP -from mcp.server.session import ServerSession +from mcp.server.transport_session import ServerTransportSession mcp = FastMCP(name="Elicitation Example") @@ -17,7 +17,7 @@ class BookingPreferences(BaseModel): @mcp.tool() -async def book_table(date: str, time: str, party_size: int, ctx: Context[ServerSession, None]) -> str: +async def book_table(date: str, time: str, party_size: int, ctx: Context[ServerTransportSession, None]) -> str: """Book a table with date availability check.""" # Check if date is available if date == "2024-12-25": diff --git a/examples/snippets/servers/lifespan_example.py b/examples/snippets/servers/lifespan_example.py index 62278b6aac..46f01f427f 100644 --- a/examples/snippets/servers/lifespan_example.py +++ b/examples/snippets/servers/lifespan_example.py @@ -5,7 +5,7 @@ from dataclasses import dataclass from mcp.server.fastmcp import Context, FastMCP -from mcp.server.session import ServerSession +from mcp.server.transport_session import ServerTransportSession # Mock database class for example @@ -51,7 +51,7 @@ async def app_lifespan(server: FastMCP) -> AsyncIterator[AppContext]: # Access type-safe lifespan context in tools @mcp.tool() -def query_db(ctx: Context[ServerSession, AppContext]) -> str: +def query_db(ctx: Context[ServerTransportSession, AppContext]) -> str: """Tool that uses initialized resources.""" db = ctx.request_context.lifespan_context.db return db.query() diff --git a/examples/snippets/servers/notifications.py b/examples/snippets/servers/notifications.py index 833bc89053..995ecd8178 100644 --- a/examples/snippets/servers/notifications.py +++ b/examples/snippets/servers/notifications.py @@ -1,11 +1,11 @@ from mcp.server.fastmcp import Context, FastMCP -from mcp.server.session import ServerSession +from mcp.server.transport_session import ServerTransportSession mcp = FastMCP(name="Notifications Example") @mcp.tool() -async def process_data(data: str, ctx: Context[ServerSession, None]) -> str: +async def process_data(data: str, ctx: Context[ServerTransportSession, None]) -> str: """Process data with logging.""" # Different log levels await ctx.debug(f"Debug: Processing '{data}'") diff --git a/examples/snippets/servers/tool_progress.py b/examples/snippets/servers/tool_progress.py index 2ac458f6aa..a0f62fda61 100644 --- a/examples/snippets/servers/tool_progress.py +++ b/examples/snippets/servers/tool_progress.py @@ -1,11 +1,11 @@ from mcp.server.fastmcp import Context, FastMCP -from mcp.server.session import ServerSession +from mcp.server.transport_session import ServerTransportSession mcp = FastMCP(name="Progress Example") @mcp.tool() -async def long_running_task(task_name: str, ctx: Context[ServerSession, None], steps: int = 5) -> str: +async def long_running_task(task_name: str, ctx: Context[ServerTransportSession, None], steps: int = 5) -> str: """Execute a task with progress updates.""" await ctx.info(f"Starting: {task_name}") diff --git a/proto/README.md b/proto/README.md new file mode 100644 index 0000000000..944ee598b1 --- /dev/null +++ b/proto/README.md @@ -0,0 +1,202 @@ +# MCP gRPC: High-Performance Transport + +This directory contains the Protocol Buffer definitions for the Model Context Protocol (MCP) as a native gRPC service. This implementation modernizes the MCP transport layer, moving beyond the limitations of HTTP/1.1 (lacks streaming) and JSON (type safety, memory footprint, processing speed) to provide a better foundation for AI agents. + +## Why gRPC for MCP? + +The traditional MCP over HTTP/1.1 uses JSON-RPC, which served as a great starting point but introduced friction as agentic workflows scaled. Our native gRPC implementation addresses these "friction points" to performance and efficiency: + +```mermaid +graph LR + subgraph "Legacy Transport (HTTP/1.1)" + A[Client] -- "JSON (Text)" --> B[Server] + B -- "Response" --> A + A -. "SSE/Polling" .-> B + style A fill:#f9f,stroke:#333,stroke-width:2px + end + subgraph "Modern Transport (gRPC/HTTP2)" + C[Client] == "Protobuf (Binary)" ==> D[Server] + C -- "Bidi Stream" --> D + D -- "Push" --> C + style D fill:#00ff0055,stroke:#333,stroke-width:2px + end +``` + +### Key Improvements + +* **Native Bidirectional Streaming**: Replaces fragile SSE and long-polling with a single, persistent HTTP/2 stream for interleaved requests, progress updates, and server notifications. +* **Binary Efficiency**: Protobuf serialization is typically 10x smaller and significantly faster than JSON, especially when handling large blobs or many small tool calls. +* **Zero-Copy Intent**: By using native `bytes` for resource data, we avoid the overhead of Base64 encoding required by JSON-RPC. +* **Native Backpressure**: Leverages HTTP/2 flow control to ensure servers aren't overwhelmed by fast clients (and vice versa). + +--- + +## Architecture & Lifecycle + +The gRPC transport is designed to be a drop-in replacement for the standard MCP session, fitting seamlessly into the pluggable transport architecture of the SDK. + +### The Session Flow + +Unlike traditional unary calls, a gRPC MCP session often starts with an initialization handshake and then moves into a long-lived bidirectional stream. + +```mermaid +sequenceDiagram + participant C as Client (AI Agent) + participant S as Server (Tool Provider) + + Note over C,S: Connection Established (HTTP/2) + + C->>S: Initialize(capabilities, client_info) + S-->>C: InitializeResponse(capabilities, server_info) + + rect rgb(240, 240, 240) + Note over C,S: Persistent Session Stream + C->>S: Session(CallToolRequest) + S->>C: Session(ProgressNotification) + S->>C: Session(CallToolResponse) + Note right of S: Server discovers local file change + S->>C: Session(ResourceChangeNotification) + end + + C->>S: Ping() + S-->>C: PingResponse() +``` + +--- + +## Service Definition + +The `McpService` provides a comprehensive interface for all MCP operations. While it supports unary calls for simple operations, it excels in its streaming variants. For a deep dive into advanced patterns like document chunking and parallel worker analysis, see our [Streaming & Multiplexing Guide](../docs/experimental/grpc-streaming.md). + +```protobuf +service McpService { + // Lifecycle & Health + rpc Initialize(InitializeRequest) returns (InitializeResponse); + rpc Ping(PingRequest) returns (PingResponse); + + // Tools: Supports parallel execution and progress streaming + rpc CallTool(CallToolRequest) returns (CallToolResponse); + rpc CallToolWithProgress(...) returns (stream CallToolWithProgressResponse); + + // Resources: Efficient handling of large datasets + rpc ReadResourceChunked(...) returns (stream ReadResourceChunkedResponse); + rpc WatchResources(...) returns (stream WatchResourcesResponse); + + // The "Power User" Interface + rpc Session(stream SessionRequest) returns (stream SessionResponse); +} +``` + +### Discoveries from Implementation + +1. **Implicit Chunking**: In our Python implementation, `read_resource` now defaults to the chunked streaming RPC under the hood. This ensures that even massive resources (like large logs or database exports) don't cause memory spikes. +2. **Background Watchers**: Resource subscriptions are handled by background stream observers, allowing the client to receive push notifications without blocking the main event loop. +3. **Unified Session**: The `Session` RPC acts as a multiplexer. This allows a single TCP connection to handle dozens of concurrent tool calls while simultaneously receiving resource updates. + +--- + +## Development & Tooling + +### Building the Stubs + +To use this protocol in Python, you need to generate the gRPC stubs. **Note:** Due to the internal import structure of generated Protobuf files, we generate stubs into `src` which creates the appropriate package hierarchy. + +```bash +# Generate Python stubs +python -m grpc_tools.protoc \ + -I proto \ + --python_out=src \ + --grpc_python_out=src \ + proto/mcp/v1/mcp.proto + +# This creates: +# src/mcp/v1/mcp_pb2.py (Standard messages) +# src/mcp/v1/mcp_pb2_grpc.py (gRPC client/server stubs) +``` + +### Dependencies + +Ensure your environment has the necessary gRPC libraries: + +```bash +uv add grpcio grpcio-tools +``` + +--- + +## Status + +**Current Status:** `Alpha / Experiemental / RFC` + +The core protocol is stable and implemented in the Python SDK's `GrpcClientTransport`. We are actively seeking feedback on the `Session` stream multiplexing patterns before finalizing the V1 specification. + +## References + +- [Official MCP Website](https://modelcontextprotocol.io) +- [Original gRPC Proposal](https://cloud.google.com/blog/products/networking/grpc-as-a-native-transport-for-mcp) +- [gRPC Documentation](https://grpc.io/docs/) + +## Open Questions + + + +### Pagination vs. Streaming vs. Limits + + + +In HTTP/JSON-RPC, paginating large lists (like `ListTools` or `ListResources`) is standard practice to manage payload sizes. gRPC offers native streaming (`stream Tool`), which allows the server to yield items one by one. + + + +**Design Decision:** We have opted for **Streaming** over Pagination in the V1 gRPC definitions. + +- **Pros:** Simpler API (no cursors), lower latency (process items as they arrive), no "page size" guessing. + +- **Cons:** "Give me just the first 10" requires the client to explicitly close the stream after 10 items. + + + +**Question:** Should we add an optional `limit` field to Request messages to allow the server to stop generating early, optimizing server-side work? Or rely on client cancellation? + +### ClientStreamingTransportSession Interface + +The current `ClientTransportSession` interface returns complete results (e.g., `ListToolsResult` with a full list). For gRPC, this means buffering the entire stream into memory before returning, which works but loses the memory efficiency benefits of streaming. + +**Proposed:** Add a `ClientStreamingTransportSession` interface that extends `ClientTransportSession`: + +```python +class ClientTransportSession(ABC): + # Existing - returns complete results (backward compat) + async def list_tools(...) -> ListToolsResult + +class ClientStreamingTransportSession(ClientTransportSession): + # Adds streaming variants + def stream_list_tools(self) -> AsyncIterator[Tool] + def stream_list_resources(self) -> AsyncIterator[Resource] + def stream_list_prompts(self) -> AsyncIterator[Prompt] + async def call_tool_with_progress(...) -> AsyncIterator[ProgressNotification | ToolResult] +``` + +**Benefits:** +- gRPC transport implements both - callers choose based on their needs +- `list_tools()` for simple use cases, `stream_list_tools()` for memory-efficient processing +- Existing code using `ClientTransportSession` continues to work unchanged +- HTTP/JSON-RPC transports implement only the base interface + +**Question:** Is this the right abstraction? Should streaming be opt-in via a separate interface, or should we change the base interface to always return iterators? + +## Implementation Notes + + + +### True Streaming vs. Buffering + + + +While the gRPC transport layer fully supports streaming (yielding `ListToolsResponse` or `ReadResourceChunkedResponse` messages individually), the current Python SDK `Server` implementation primarily operates with buffered lists. + + + +* **List Operations:** Handlers for `list_tools`, `list_resources`, etc., typically return a full `list[...]`. The gRPC transport iterates over this list to stream responses, meaning the latency benefit is "transport-only" rather than "end-to-end" until the core `Server` supports async generators. + +* **Resource Reading:** Similarly, `read_resource` handlers currently return the complete content. The gRPC transport chunks this content *after* it has been fully loaded into memory. True zero-copy streaming from disk/network to the gRPC stream will require updates to the `Server` class to support yielding data chunks directly. diff --git a/proto/mcp/v1/mcp.proto b/proto/mcp/v1/mcp.proto new file mode 100644 index 0000000000..c86e96294e --- /dev/null +++ b/proto/mcp/v1/mcp.proto @@ -0,0 +1,552 @@ +// Model Context Protocol (MCP) gRPC Service Definition +// +// This proto defines MCP as a native gRPC service, leveraging HTTP/2 +// bidirectional streaming for efficient agent-tool communication. +// +// Design principles: +// - Maps directly to MCP spec concepts (tools, resources, prompts) +// - Uses streaming where it provides clear benefits +// - Maintains compatibility with existing MCP semantics +// - Leverages protobuf for type safety and efficiency + +syntax = "proto3"; + +package mcp.v1; + +import "google/protobuf/any.proto"; +import "google/protobuf/struct.proto"; +import "google/protobuf/timestamp.proto"; + +option java_package = "io.modelcontextprotocol.api.v1"; +option java_multiple_files = true; +option go_package = "github.com/modelcontextprotocol/go-sdk/mcpv1"; + +// ============================================================================= +// MCP Service Definition +// ============================================================================= + +service McpService { + // --- Lifecycle --- + + // Initialize the MCP session and negotiate capabilities + rpc Initialize(InitializeRequest) returns (InitializeResponse); + + // Ping for health checks + rpc Ping(PingRequest) returns (PingResponse); + + // --- Tools --- + + // List available tools (streaming) + rpc ListTools(ListToolsRequest) returns (stream ListToolsResponse); + + // Call a tool - unary for simple calls + rpc CallTool(CallToolRequest) returns (CallToolResponse); + + // Call a tool with streaming progress updates + // Server streams progress notifications, final message contains result + rpc CallToolWithProgress(CallToolWithProgressRequest) returns (stream CallToolWithProgressResponse); + + // Stream multiple tool calls - client streams requests, server streams results + // Enables parallel tool execution with results as they complete + rpc StreamToolCalls(stream StreamToolCallsRequest) returns (stream StreamToolCallsResponse); + + // --- Resources --- + + // List available resources (streaming) + rpc ListResources(ListResourcesRequest) returns (stream ListResourcesResponse); + + // List resource templates (streaming) + rpc ListResourceTemplates(ListResourceTemplatesRequest) returns (stream ListResourceTemplatesResponse); + + // Read a resource - unary for small resources + rpc ReadResource(ReadResourceRequest) returns (ReadResourceResponse); + + // Read a large resource in chunks - server streams chunks + rpc ReadResourceChunked(ReadResourceChunkedRequest) returns (stream ReadResourceChunkedResponse); + + // Subscribe to resource changes - server streams notifications + // Replaces polling with push-based updates + rpc WatchResources(WatchResourcesRequest) returns (stream WatchResourcesResponse); + + // --- Prompts --- + + // List available prompts (streaming) + rpc ListPrompts(ListPromptsRequest) returns (stream ListPromptsResponse); + + // Get a prompt + rpc GetPrompt(GetPromptRequest) returns (GetPromptResponse); + + // Stream prompt completion tokens as they're generated + rpc StreamPromptCompletion(StreamPromptCompletionRequest) returns (stream StreamPromptCompletionResponse); + + // --- Completion --- + + // Autocomplete for resource templates or prompts + rpc Complete(CompleteRequest) returns (CompleteResponse); + + // --- Bidirectional Session Stream --- + + // Full bidirectional stream for complex agent interactions + // Enables any MCP operation over a single persistent connection + rpc Session(stream SessionRequest) returns (stream SessionResponse); +} + +// ============================================================================= +// Common Types +// ============================================================================= + +message Metadata { + map annotations = 1; +} + +message ProgressToken { + oneof token { + string string_token = 1; + int64 int_token = 2; + } +} + +message Cursor { + string value = 1; +} + +// Role in a conversation +enum Role { + ROLE_UNSPECIFIED = 0; + ROLE_USER = 1; + ROLE_ASSISTANT = 2; +} + +// ============================================================================= +// Lifecycle Messages +// ============================================================================= + +message InitializeRequest { + string protocol_version = 1; + ClientCapabilities capabilities = 2; + ClientInfo client_info = 3; +} + +message InitializeResponse { + string protocol_version = 1; + ServerCapabilities capabilities = 2; + ServerInfo server_info = 3; + string instructions = 4; +} + +message ClientInfo { + string name = 1; + string version = 2; +} + +message ServerInfo { + string name = 1; + string version = 2; +} + +message ClientCapabilities { + RootsCapability roots = 1; + SamplingCapability sampling = 2; + ExperimentalCapabilities experimental = 3; +} + +message ServerCapabilities { + PromptsCapability prompts = 1; + ResourcesCapability resources = 2; + ToolsCapability tools = 3; + LoggingCapability logging = 4; + ExperimentalCapabilities experimental = 5; +} + +message RootsCapability { + bool list_changed = 1; +} + +message SamplingCapability {} + +message PromptsCapability { + bool list_changed = 1; +} + +message ResourcesCapability { + bool subscribe = 1; + bool list_changed = 2; +} + +message ToolsCapability { + bool list_changed = 1; +} + +message LoggingCapability {} + +message ExperimentalCapabilities { + map capabilities = 1; +} + +message PingRequest {} + +message PingResponse {} + +// ============================================================================= +// Tool Messages +// ============================================================================= + +message Tool { + string name = 1; + string description = 2; + google.protobuf.Struct input_schema = 3; // JSON Schema as Struct + ToolAnnotations annotations = 4; +} + +message ToolAnnotations { + string title = 1; + bool read_only_hint = 2; + bool destructive_hint = 3; + bool idempotent_hint = 4; + bool open_world_hint = 5; +} + +message ListToolsRequest { + // No cursor needed for streaming +} + +message ListToolsResponse { + Tool tool = 1; +} + +// Unary tool call +message CallToolRequest { + string name = 1; + google.protobuf.Struct arguments = 2; +} + +message CallToolResponse { + repeated Content content = 1; + bool is_error = 2; +} + +// Tool call with streaming progress +message CallToolWithProgressRequest { + string name = 1; + google.protobuf.Struct arguments = 2; + ProgressToken progress_token = 3; +} + +message CallToolWithProgressResponse { + oneof update { + ProgressNotification progress = 1; + ToolResult result = 2; + } +} + +// Streaming tool calls (parallel execution) +message StreamToolCallsRequest { + string request_id = 1; // Correlate request/response in stream + string name = 2; + google.protobuf.Struct arguments = 3; +} + +message StreamToolCallsResponse { + string request_id = 1; // Correlates with request + repeated Content content = 2; + bool is_error = 3; +} + +// Tool result (used in streaming responses) +message ToolResult { + repeated Content content = 1; + bool is_error = 2; +} + +message ProgressNotification { + ProgressToken progress_token = 1; + double progress = 2; + double total = 3; + string message = 4; +} + +// ============================================================================= +// Content Types +// ============================================================================= + +message Content { + oneof content { + TextContent text = 1; + ImageContent image = 2; + AudioContent audio = 3; + EmbeddedResource resource = 4; + } + ContentAnnotations annotations = 5; +} + +message TextContent { + string text = 1; +} + +message ImageContent { + string data = 1; // Base64 encoded + string mime_type = 2; +} + +message AudioContent { + string data = 1; // Base64 encoded + string mime_type = 2; +} + +message EmbeddedResource { + ResourceContents resource = 1; +} + +message ContentAnnotations { + Role audience = 1; + double priority = 2; // 0.0 to 1.0 +} + +// ============================================================================= +// Resource Messages +// ============================================================================= + +message Resource { + string uri = 1; + string name = 2; + string description = 3; + string mime_type = 4; + int64 size = 5; + Metadata metadata = 6; +} + +message ResourceTemplate { + string uri_template = 1; // RFC 6570 + string name = 2; + string description = 3; + string mime_type = 4; +} + +message ListResourcesRequest { + // No cursor needed +} + +message ListResourcesResponse { + Resource resource = 1; +} + +message ListResourceTemplatesRequest { + // No cursor needed +} + +message ListResourceTemplatesResponse { + ResourceTemplate resource_template = 1; +} + +// Unary resource read +message ReadResourceRequest { + string uri = 1; +} + +message ReadResourceResponse { + repeated ResourceContents contents = 1; +} + +// Chunked resource read (streaming) +message ReadResourceChunkedRequest { + string uri = 1; + int32 chunk_size = 2; // Requested chunk size in bytes (0 = server default) + int64 offset = 3; // Starting offset for range reads +} + +message ReadResourceChunkedResponse { + string uri = 1; + string mime_type = 2; + + oneof content { + string text_chunk = 3; + bytes blob_chunk = 4; + } + + int64 offset = 5; // Byte offset of this chunk + int64 total_size = 6; // Total resource size if known + bool is_final = 7; // True if this is the last chunk +} + +message ResourceContents { + string uri = 1; + string mime_type = 2; + + oneof content { + string text = 3; + bytes blob = 4; // Binary data (more efficient than base64 in proto) + } +} + +// Watch for resource changes +message WatchResourcesRequest { + repeated string uri_patterns = 1; // Glob patterns like "file://**/*.py" + bool include_initial = 2; // Emit current state first +} + +message WatchResourcesResponse { + string uri = 1; + ResourceChangeType change_type = 2; + google.protobuf.Timestamp timestamp = 3; + ResourceContents contents = 4; // Optional: include new contents +} + +enum ResourceChangeType { + RESOURCE_CHANGE_TYPE_UNSPECIFIED = 0; + RESOURCE_CHANGE_TYPE_CREATED = 1; + RESOURCE_CHANGE_TYPE_MODIFIED = 2; + RESOURCE_CHANGE_TYPE_DELETED = 3; +} + +// ============================================================================= +// Prompt Messages +// ============================================================================= + +message Prompt { + string name = 1; + string description = 2; + repeated PromptArgument arguments = 3; +} + +message PromptArgument { + string name = 1; + string description = 2; + bool required = 3; +} + +message ListPromptsRequest { + // No cursor needed +} + +message ListPromptsResponse { + Prompt prompt = 1; +} + +// Unary prompt get +message GetPromptRequest { + string name = 1; + map arguments = 2; +} + +message GetPromptResponse { + string description = 1; + repeated PromptMessage messages = 2; +} + +// Streaming prompt completion +message StreamPromptCompletionRequest { + string name = 1; + map arguments = 2; +} + +message StreamPromptCompletionResponse { + string token = 1; // Individual token/chunk + bool is_final = 2; // True if generation is complete + string finish_reason = 3; // Why generation stopped (if final) +} + +message PromptMessage { + Role role = 1; + Content content = 2; +} + +// ============================================================================= +// Completion (Autocomplete) Messages +// ============================================================================= + +message CompleteRequest { + oneof ref { + ResourceTemplateRef resource_template_ref = 1; + PromptRef prompt_ref = 2; + } + string argument_name = 3; + string argument_value = 4; // Partial value to complete +} + +message ResourceTemplateRef { + string type = 1; // "ref/resource" + string uri = 2; +} + +message PromptRef { + string type = 1; // "ref/prompt" + string name = 2; +} + +message CompleteResponse { + CompletionResult completion = 1; +} + +message CompletionResult { + repeated string values = 1; + int32 total = 2; + bool has_more = 3; +} + +// ============================================================================= +// Bidirectional Session Messages +// ============================================================================= + +// Request wrapper for bidirectional session stream +message SessionRequest { + string message_id = 1; + + oneof payload { + // Requests + InitializeRequest initialize = 10; + PingRequest ping = 11; + ListToolsRequest list_tools = 12; + CallToolRequest call_tool = 13; + ListResourcesRequest list_resources = 14; + ReadResourceRequest read_resource = 15; + WatchResourcesRequest watch_resources = 16; + ListPromptsRequest list_prompts = 17; + GetPromptRequest get_prompt = 18; + CompleteRequest complete = 19; + ListResourceTemplatesRequest list_resource_templates = 20; + ReadResourceChunkedRequest read_resource_chunked = 21; + StreamPromptCompletionRequest stream_prompt_completion = 22; + + // Control + CancelRequest cancel = 70; + } +} + +// Response wrapper for bidirectional session stream +message SessionResponse { + string message_id = 1; + string in_reply_to = 2; // References the request message_id + + oneof payload { + // Responses + InitializeResponse initialize = 10; + PingResponse ping = 11; + ListToolsResponse list_tools = 12; + CallToolResponse call_tool = 13; + ListResourcesResponse list_resources = 14; + ReadResourceResponse read_resource = 15; + ListPromptsResponse list_prompts = 16; + GetPromptResponse get_prompt = 17; + CompleteResponse complete = 18; + ListResourceTemplatesResponse list_resource_templates = 19; + + // Streaming data (server-initiated) + ReadResourceChunkedResponse resource_chunk = 50; + WatchResourcesResponse resource_notification = 51; + ProgressNotification progress = 52; + StreamPromptCompletionResponse completion_chunk = 53; + + // Errors + ErrorResponse error = 60; + } +} + +message ErrorResponse { + int32 code = 1; + string message = 2; + google.protobuf.Any data = 3; +} + +message CancelRequest { + string request_id = 1; // ID of request to cancel +} diff --git a/pyproject.toml b/pyproject.toml index 078a1dfdcb..54f947631b 100644 --- a/pyproject.toml +++ b/pyproject.toml @@ -42,6 +42,7 @@ dependencies = [ rich = ["rich>=13.9.4"] cli = ["typer>=0.16.0", "python-dotenv>=1.0.0"] ws = ["websockets>=15.0.1"] +grpc = ["grpcio>=1.76.0", "grpcio-tools>=1.76.0"] [project.scripts] mcp = "mcp.cli:app [cli]" @@ -63,6 +64,8 @@ dev = [ "inline-snapshot>=0.23.0", "dirty-equals>=0.9.0", "coverage[toml]==7.10.7", + "grpcio==1.76.0", + "grpcio-tools==1.76.0", ] docs = [ "mkdocs>=1.6.1", diff --git a/src/mcp/__init__.py b/src/mcp/__init__.py index e93b95c902..93ef8acdf7 100644 --- a/src/mcp/__init__.py +++ b/src/mcp/__init__.py @@ -1,8 +1,10 @@ from .client.session import ClientSession from .client.session_group import ClientSessionGroup from .client.stdio import StdioServerParameters, stdio_client +from .client.transport_session import ClientTransportSession from .server.session import ServerSession from .server.stdio import stdio_server +from .server.transport_session import ServerTransportSession from .shared.exceptions import McpError from .types import ( CallToolRequest, @@ -113,4 +115,6 @@ "stdio_server", "CompleteRequest", "JSONRPCResponse", + "ClientTransportSession", + "ServerTransportSession", ] diff --git a/src/mcp/client/grpc/__init__.py b/src/mcp/client/grpc/__init__.py new file mode 100644 index 0000000000..ff900e952e --- /dev/null +++ b/src/mcp/client/grpc/__init__.py @@ -0,0 +1,11 @@ +""" +gRPC transport implementation for MCP client. + +This module provides a gRPC-based transport that implements the +ClientTransportSession interface, enabling MCP communication over +gRPC with HTTP/2 bidirectional streaming. +""" + +from mcp.client.grpc.transport import GrpcClientTransport + +__all__ = ["GrpcClientTransport"] diff --git a/src/mcp/client/grpc/transport.py b/src/mcp/client/grpc/transport.py new file mode 100644 index 0000000000..9704020a21 --- /dev/null +++ b/src/mcp/client/grpc/transport.py @@ -0,0 +1,669 @@ +""" +gRPC transport implementation for MCP client. + +This implements ClientTransportSession using gRPC, providing: +- Binary protobuf encoding (more efficient than JSON) +- HTTP/2 multiplexing +- Native streaming for progress updates and resource watching +- Built-in flow control and backpressure +""" + +from __future__ import annotations + +import asyncio +import logging +from collections.abc import AsyncIterator +from datetime import timedelta +from typing import Any + +import grpc +from google.protobuf import struct_pb2 +from pydantic import AnyUrl + +import mcp.types as types +from mcp.client.transport_session import ClientTransportSession +from mcp.shared.session import ProgressFnT + +# Generated from proto/mcp/v1/mcp.proto +# Generate with: python -m grpc_tools.protoc -I proto --python_out=src --grpc_python_out=src proto/mcp/v1/mcp.proto +try: + from mcp.v1.mcp_pb2 import ( + CallToolRequest, + CallToolWithProgressRequest, + CompleteRequest, + GetPromptRequest, + InitializeRequest, + ListPromptsRequest, + ListResourcesRequest, + ListResourceTemplatesRequest, + ListToolsRequest, + PingRequest, + PromptRef, + ReadResourceChunkedRequest, + ResourceTemplateRef, + SessionRequest, + SessionResponse, + WatchResourcesRequest, + ) + from mcp.v1.mcp_pb2_grpc import McpServiceStub + + GRPC_AVAILABLE = True +except ImportError: + GRPC_AVAILABLE = False + +logger = logging.getLogger(__name__) + + +class GrpcClientTransport(ClientTransportSession): + """ + gRPC-based MCP client transport. + + This transport implements the ClientTransportSession interface using gRPC, + providing efficient binary communication with native streaming support. + + Example: + async with GrpcClientTransport("localhost:50051") as transport: + result = await transport.initialize() + tools = await transport.list_tools() + """ + + def __init__( + self, + target: str, + *, + credentials: grpc.ChannelCredentials | None = None, + options: list[tuple[str, Any]] | None = None, + client_info: types.Implementation | None = None, + ) -> None: + """ + Initialize gRPC transport. + + Args: + target: gRPC server address (e.g., "localhost:50051") + credentials: Optional TLS credentials for secure channels + options: Optional gRPC channel options + client_info: Client implementation info for initialization + """ + if not GRPC_AVAILABLE: + raise ImportError( + "gRPC dependencies not installed. " + "Install with: uv add grpcio grpcio-tools" + ) + + self._target = target + self._credentials = credentials + self._options = options or [] + self._client_info = client_info or types.Implementation( + name="mcp-python-grpc", version="0.1.0" + ) + + self._channel: grpc.aio.Channel | None = None + self._stub: McpServiceStub | None = None + self._server_info: types.Implementation | None = None + self._server_capabilities: types.ServerCapabilities | None = None + + # Bidirectional session state + self._session_task: asyncio.Task[None] | None = None + self._session_requests: asyncio.Queue[SessionRequest] | None = None + self._session_responses: dict[str, asyncio.Future[SessionResponse]] = {} + self._session_notifications: asyncio.Queue[SessionResponse] | None = None + + async def __aenter__(self) -> GrpcClientTransport: + """Open the gRPC channel and start the session stream if supported.""" + if self._credentials: + self._channel = grpc.aio.secure_channel( + self._target, self._credentials, options=self._options + ) + else: + self._channel = grpc.aio.insecure_channel( + self._target, options=self._options + ) + self._stub = McpServiceStub(self._channel) + + # Initialize session stream + self._session_requests = asyncio.Queue() + self._session_notifications = asyncio.Queue() + self._session_task = asyncio.create_task(self._run_session_stream()) + + return self + + async def __aexit__(self, exc_type: Any, exc_val: Any, exc_tb: Any) -> None: + """Close the gRPC channel and stop the session stream.""" + if self._session_task: + self._session_task.cancel() + try: + await self._session_task + except asyncio.CancelledError: + pass + self._session_task = None + + if self._channel: + await self._channel.close() + self._channel = None + self._stub = None + + async def _run_session_stream(self) -> None: + """Maintain the bidirectional session stream.""" + stub = self._ensure_connected() + + async def request_generator() -> AsyncIterator[SessionRequest]: + while True: + req = await self._session_requests.get() # type: ignore + yield req + + try: + async for response in stub.Session(request_generator()): + if response.in_reply_to: + future = self._session_responses.pop(response.in_reply_to, None) + if future: + future.set_result(response) + else: + # It's a notification/server-initiated message + await self._session_notifications.put(response) # type: ignore + except Exception as e: + if not isinstance(e, asyncio.CancelledError): + logger.exception("gRPC session stream error") + # Fail all pending requests + for future in self._session_responses.values(): + if not future.done(): + future.set_exception(e) + self._session_responses.clear() + + async def _call_session(self, request: SessionRequest) -> SessionResponse: + """Call an RPC via the bidirectional session stream.""" + if not request.message_id: + import uuid + + request.message_id = str(uuid.uuid4()) + + future: asyncio.Future[SessionResponse] = asyncio.get_running_loop().create_future() + self._session_responses[request.message_id] = future + await self._session_requests.put(request) # type: ignore + + try: + return await future + except Exception: + self._session_responses.pop(request.message_id, None) + raise + + def _ensure_connected(self) -> McpServiceStub: + """Ensure we have an active stub.""" + if self._stub is None: + raise RuntimeError( + "Transport not connected. Use 'async with' or call __aenter__" + ) + return self._stub + + def _map_error(self, e: grpc.RpcError) -> Exception: + """Map gRPC errors to MCP errors or standard Python exceptions.""" + code = e.code() + if code == grpc.StatusCode.NOT_FOUND: + return ValueError(f"Not found: {e.details()}") + elif code == grpc.StatusCode.INVALID_ARGUMENT: + return ValueError(f"Invalid argument: {e.details()}") + elif code == grpc.StatusCode.UNIMPLEMENTED: + return NotImplementedError(f"Not implemented: {e.details()}") + elif code == grpc.StatusCode.PERMISSION_DENIED: + return PermissionError(f"Permission denied: {e.details()}") + return e + + # ------------------------------------------------------------------------- + # Type Conversion Helpers + # ------------------------------------------------------------------------- + + @staticmethod + def _dict_to_struct(d: dict[str, Any] | None) -> struct_pb2.Struct: + """Convert a Python dict to protobuf Struct.""" + struct = struct_pb2.Struct() + if d: + struct.update(d) + return struct + + @staticmethod + def _struct_to_dict(struct: struct_pb2.Struct) -> dict[str, Any]: + """Convert protobuf Struct to Python dict.""" + from google.protobuf.json_format import MessageToDict + + return MessageToDict(struct) + + def _convert_tool(self, proto_tool: Any) -> types.Tool: + """Convert proto Tool to MCP Tool.""" + return types.Tool( + name=proto_tool.name, + description=proto_tool.description or None, + inputSchema=self._struct_to_dict(proto_tool.input_schema), + ) + + def _convert_resource(self, proto_resource: Any) -> types.Resource: + """Convert proto Resource to MCP Resource.""" + return types.Resource( + uri=AnyUrl(proto_resource.uri), + name=proto_resource.name, + description=proto_resource.description or None, + mimeType=proto_resource.mime_type or None, + ) + + def _convert_prompt(self, proto_prompt: Any) -> types.Prompt: + """Convert proto Prompt to MCP Prompt.""" + return types.Prompt( + name=proto_prompt.name, + description=proto_prompt.description or None, + arguments=[ + types.PromptArgument( + name=arg.name, + description=arg.description or None, + required=arg.required, + ) + for arg in proto_prompt.arguments + ] + if proto_prompt.arguments + else None, + ) + + def _convert_content(self, proto_content: Any) -> types.TextContent | types.ImageContent: + """Convert proto Content to MCP Content.""" + content_type = proto_content.WhichOneof("content") + if content_type == "text": + return types.TextContent(type="text", text=proto_content.text.text) + elif content_type == "image": + return types.ImageContent( + type="image", + data=proto_content.image.data, + mimeType=proto_content.image.mime_type, + ) + else: + raise ValueError(f"Unknown content type: {content_type}") + + # ------------------------------------------------------------------------- + # ClientTransportSession Implementation + # ------------------------------------------------------------------------- + + async def initialize(self) -> types.InitializeResult: + """Initialize the MCP session.""" + stub = self._ensure_connected() + + request = InitializeRequest( + protocol_version=types.LATEST_PROTOCOL_VERSION, + ) + request.client_info.name = self._client_info.name + request.client_info.version = self._client_info.version + + try: + response = await stub.Initialize(request) + except grpc.RpcError as e: + raise self._map_error(e) from e + + self._server_info = types.Implementation( + name=response.server_info.name, + version=response.server_info.version, + ) + + # Convert capabilities + self._server_capabilities = types.ServerCapabilities( + prompts=types.PromptsCapability( + listChanged=response.capabilities.prompts.list_changed + ) + if response.capabilities.HasField("prompts") + else None, + resources=types.ResourcesCapability( + subscribe=response.capabilities.resources.subscribe, + listChanged=response.capabilities.resources.list_changed, + ) + if response.capabilities.HasField("resources") + else None, + tools=types.ToolsCapability( + listChanged=response.capabilities.tools.list_changed + ) + if response.capabilities.HasField("tools") + else None, + ) + + return types.InitializeResult( + protocolVersion=response.protocol_version, + capabilities=self._server_capabilities, + serverInfo=self._server_info, + instructions=response.instructions or None, + ) + + async def send_ping(self) -> types.EmptyResult: + """Send a ping request.""" + stub = self._ensure_connected() + try: + await stub.Ping(PingRequest()) + except grpc.RpcError as e: + raise self._map_error(e) from e + return types.EmptyResult() + + async def send_progress_notification( + self, + progress_token: str | int, + progress: float, + total: float | None = None, + message: str | None = None, + ) -> None: + """Send a progress notification. + + Note: In gRPC, progress is typically sent via streaming responses + rather than separate notifications. This method is provided for + compatibility but may use the bidirectional Session stream. + """ + # In gRPC transport, progress is handled via streaming RPCs + # This could use the Session bidirectional stream for notifications + logger.debug( + "Progress notification: token=%s, progress=%s, total=%s, message=%s", + progress_token, + progress, + total, + message, + ) + + async def set_logging_level( + self, + level: types.LoggingLevel, + ) -> types.EmptyResult: + """Set logging level. + + Note: This may need a custom RPC added to the proto. + """ + # TODO: Add SetLoggingLevel RPC to proto + logger.info("Setting logging level to %s (not yet implemented in gRPC)", level) + return types.EmptyResult() + + async def list_resources( + self, + cursor: str | None = None, + ) -> types.ListResourcesResult: + """List available resources.""" + stub = self._ensure_connected() + + if cursor: + logger.warning("Cursors are not supported in gRPC streaming list_resources") + + request = ListResourcesRequest() + + resources = [] + try: + async for response in stub.ListResources(request): + resources.append(self._convert_resource(response.resource)) + except grpc.RpcError as e: + raise self._map_error(e) from e + + return types.ListResourcesResult( + resources=resources, + nextCursor=None, + ) + + async def list_resource_templates( + self, + cursor: str | None = None, + ) -> types.ListResourceTemplatesResult: + """List resource templates.""" + stub = self._ensure_connected() + + if cursor: + logger.warning("Cursors are not supported in gRPC streaming list_resource_templates") + + request = ListResourceTemplatesRequest() + + templates = [] + try: + async for response in stub.ListResourceTemplates(request): + t = response.resource_template + templates.append( + types.ResourceTemplate( + uriTemplate=t.uri_template, + name=t.name, + description=t.description or None, + mimeType=t.mime_type or None, + ) + ) + except grpc.RpcError as e: + raise self._map_error(e) from e + + return types.ListResourceTemplatesResult( + resourceTemplates=templates, + nextCursor=None, + ) + + async def read_resource(self, uri: AnyUrl) -> types.ReadResourceResult: + """Read a resource. Uses ReadResourceChunked for large resources.""" + stub = self._ensure_connected() + + # We'll use ReadResourceChunked by default to handle any size + request = ReadResourceChunkedRequest(uri=str(uri)) + + contents_map: dict[str, Any] = {} # uri -> {mime_type, text_chunks, blob_chunks} + + async for chunk in stub.ReadResourceChunked(request): + if chunk.uri not in contents_map: + contents_map[chunk.uri] = { + "mime_type": chunk.mime_type, + "text_chunks": [], + "blob_chunks": [] + } + + chunk_type = chunk.WhichOneof("content") + if chunk_type == "text_chunk": + contents_map[chunk.uri]["text_chunks"].append(chunk.text_chunk) + elif chunk_type == "blob_chunk": + contents_map[chunk.uri]["blob_chunks"].append(chunk.blob_chunk) + + result_contents: list[types.TextResourceContents | types.BlobResourceContents] = [] + for res_uri, data in contents_map.items(): + if data["text_chunks"]: + result_contents.append( + types.TextResourceContents( + uri=AnyUrl(res_uri), + mimeType=data["mime_type"] or None, + text="".join(data["text_chunks"]), + ) + ) + elif data["blob_chunks"]: + import base64 + full_blob = b"".join(data["blob_chunks"]) + result_contents.append( + types.BlobResourceContents( + uri=AnyUrl(res_uri), + mimeType=data["mime_type"] or None, + blob=base64.b64encode(full_blob).decode("ascii"), + ) + ) + + return types.ReadResourceResult(contents=result_contents) + + async def subscribe_resource(self, uri: AnyUrl) -> types.EmptyResult: + """Subscribe to resource changes.""" + stub = self._ensure_connected() + request = WatchResourcesRequest(uri_patterns=[str(uri)]) + + # Start the watch stream in the background if not already running + # For now, we'll just call the unary-like stream start + # In a full implementation, we'd manage these streams and route notifications + stream = stub.WatchResources(request) + + async def _watch(): + async for notification in stream: + # Handle notification (e.g., put into a queue or trigger callback) + logger.debug("Resource change: %s", notification.uri) + + asyncio.create_task(_watch()) + return types.EmptyResult() + + async def unsubscribe_resource(self, uri: AnyUrl) -> types.EmptyResult: + """Unsubscribe from resource changes.""" + # In this simplified implementation, we don't track the tasks to cancel them + logger.info("Resource unsubscription requested for %s", uri) + return types.EmptyResult() + + async def call_tool( + self, + name: str, + arguments: Any | None = None, + read_timeout_seconds: timedelta | None = None, + progress_callback: ProgressFnT | None = None, + ) -> types.CallToolResult: + """Call a tool.""" + stub = self._ensure_connected() + + request = CallToolRequest( + name=name, + arguments=self._dict_to_struct(arguments) if arguments else None, + ) + + timeout = read_timeout_seconds.total_seconds() if read_timeout_seconds else None + + if progress_callback: + # Use streaming RPC for progress support + progress_request = CallToolWithProgressRequest( + name=name, + arguments=self._dict_to_struct(arguments) if arguments else None, + ) + contents: list[types.TextContent | types.ImageContent] = [] + is_error = False + + async for response in stub.CallToolWithProgress(progress_request, timeout=timeout): + update_type = response.WhichOneof("update") + if update_type == "progress": + await progress_callback( + response.progress.progress, + response.progress.total or None, + response.progress.message or None, + ) + elif update_type == "result": + contents = [self._convert_content(c) for c in response.result.content] + is_error = response.result.is_error + + return types.CallToolResult(content=contents, isError=is_error) + else: + # Use simple unary RPC + response = await stub.CallTool(request, timeout=timeout) + return types.CallToolResult( + content=[self._convert_content(c) for c in response.content], + isError=response.is_error, + ) + + async def list_prompts( + self, + cursor: str | None = None, + ) -> types.ListPromptsResult: + """List available prompts.""" + stub = self._ensure_connected() + + if cursor: + logger.warning("Cursors are not supported in gRPC streaming list_prompts") + + request = ListPromptsRequest() + + prompts = [] + try: + async for response in stub.ListPrompts(request): + prompts.append(self._convert_prompt(response.prompt)) + except grpc.RpcError as e: + raise self._map_error(e) from e + + return types.ListPromptsResult( + prompts=prompts, + nextCursor=None, + ) + + async def get_prompt( + self, + name: str, + arguments: dict[str, str] | None = None, + ) -> types.GetPromptResult: + """Get a prompt.""" + stub = self._ensure_connected() + + request = GetPromptRequest(name=name) + if arguments: + request.arguments.update(arguments) + + try: + response = await stub.GetPrompt(request) + except grpc.RpcError as e: + raise self._map_error(e) from e + + return types.GetPromptResult( + description=response.description or None, + messages=[ + types.PromptMessage( + role="user" if m.role == 1 else "assistant", + content=self._convert_content(m.content), + ) + for m in response.messages + ], + ) + + async def complete( + self, + ref: types.ResourceTemplateReference | types.PromptReference, + argument: dict[str, str], + context_arguments: dict[str, str] | None = None, + ) -> types.CompleteResult: + """Complete a resource template or prompt argument.""" + stub = self._ensure_connected() + + request = CompleteRequest() + + if isinstance(ref, types.PromptReference): + request.prompt_ref.CopyFrom( + PromptRef(type="ref/prompt", name=ref.name) + ) + else: + request.resource_template_ref.CopyFrom( + ResourceTemplateRef(type="ref/resource", uri=str(ref.uri)) + ) + + # Get first argument name and value + if argument: + arg_name, arg_value = next(iter(argument.items())) + request.argument_name = arg_name + request.argument_value = arg_value + + try: + response = await stub.Complete(request) + except grpc.RpcError as e: + raise self._map_error(e) from e + + return types.CompleteResult( + completion=types.Completion( + values=list(response.completion.values), + total=response.completion.total or None, + hasMore=response.completion.has_more, + ) + ) + + async def list_tools( + self, + cursor: str | None = None, + *, + params: types.PaginatedRequestParams | None = None, + ) -> types.ListToolsResult: + """List available tools.""" + stub = self._ensure_connected() + + effective_cursor = params.cursor if params else cursor + if effective_cursor: + logger.warning("Cursors are not supported in gRPC streaming list_tools") + + request = ListToolsRequest() + + tools = [] + try: + async for response in stub.ListTools(request): + tools.append(self._convert_tool(response.tool)) + except grpc.RpcError as e: + raise self._map_error(e) from e + + return types.ListToolsResult( + tools=tools, + nextCursor=None, + ) + + async def send_roots_list_changed(self) -> None: + """Send roots/list_changed notification. + + Note: In gRPC, this would use the bidirectional Session stream. + """ + # TODO: Send via Session bidirectional stream + logger.debug("Roots list changed notification (not yet implemented in gRPC)") diff --git a/src/mcp/client/session.py b/src/mcp/client/session.py index 3835a2a577..0bd4e9608e 100644 --- a/src/mcp/client/session.py +++ b/src/mcp/client/session.py @@ -9,6 +9,7 @@ from typing_extensions import deprecated import mcp.types as types +from mcp.client.transport_session import ClientTransportSession from mcp.shared.context import RequestContext from mcp.shared.message import SessionMessage from mcp.shared.session import BaseSession, ProgressFnT, RequestResponder @@ -22,7 +23,7 @@ class SamplingFnT(Protocol): async def __call__( self, - context: RequestContext["ClientSession", Any], + context: RequestContext["ClientTransportSession", Any], params: types.CreateMessageRequestParams, ) -> types.CreateMessageResult | types.ErrorData: ... # pragma: no branch @@ -30,14 +31,14 @@ async def __call__( class ElicitationFnT(Protocol): async def __call__( self, - context: RequestContext["ClientSession", Any], + context: RequestContext["ClientTransportSession", Any], params: types.ElicitRequestParams, ) -> types.ElicitResult | types.ErrorData: ... # pragma: no branch class ListRootsFnT(Protocol): async def __call__( - self, context: RequestContext["ClientSession", Any] + self, context: RequestContext["ClientTransportSession", Any] ) -> types.ListRootsResult | types.ErrorData: ... # pragma: no branch @@ -62,7 +63,7 @@ async def _default_message_handler( async def _default_sampling_callback( - context: RequestContext["ClientSession", Any], + context: RequestContext["ClientTransportSession", Any], params: types.CreateMessageRequestParams, ) -> types.CreateMessageResult | types.ErrorData: return types.ErrorData( @@ -72,7 +73,7 @@ async def _default_sampling_callback( async def _default_elicitation_callback( - context: RequestContext["ClientSession", Any], + context: RequestContext["ClientTransportSession", Any], params: types.ElicitRequestParams, ) -> types.ElicitResult | types.ErrorData: return types.ErrorData( # pragma: no cover @@ -82,7 +83,7 @@ async def _default_elicitation_callback( async def _default_list_roots_callback( - context: RequestContext["ClientSession", Any], + context: RequestContext["ClientTransportSession", Any], ) -> types.ListRootsResult | types.ErrorData: return types.ErrorData( code=types.INVALID_REQUEST, @@ -100,13 +101,14 @@ async def _default_logging_callback( class ClientSession( + ClientTransportSession, BaseSession[ types.ClientRequest, types.ClientNotification, types.ClientResult, types.ServerRequest, types.ServerNotification, - ] + ], ): def __init__( self, @@ -508,7 +510,7 @@ async def send_roots_list_changed(self) -> None: # pragma: no cover await self.send_notification(types.ClientNotification(types.RootsListChangedNotification())) async def _received_request(self, responder: RequestResponder[types.ServerRequest, types.ClientResult]) -> None: - ctx = RequestContext[ClientSession, Any]( + ctx = RequestContext[ClientTransportSession, Any]( request_id=responder.request_id, meta=responder.request_meta, session=self, diff --git a/src/mcp/client/transport_session.py b/src/mcp/client/transport_session.py new file mode 100644 index 0000000000..07389d59a0 --- /dev/null +++ b/src/mcp/client/transport_session.py @@ -0,0 +1,130 @@ +from abc import ABC, abstractmethod +from datetime import timedelta +from typing import Any + +from pydantic import AnyUrl + +import mcp.types as types +from mcp.shared.session import ProgressFnT + + +class ClientTransportSession(ABC): + """Abstract base class for communication transports.""" + + @abstractmethod + async def initialize(self) -> types.InitializeResult: + """Send an initialize request.""" + raise NotImplementedError + + @abstractmethod + async def send_ping(self) -> types.EmptyResult: + """Send a ping request.""" + raise NotImplementedError + + @abstractmethod + async def send_progress_notification( + self, + progress_token: str | int, + progress: float, + total: float | None = None, + message: str | None = None, + ) -> None: + """Send a progress notification.""" + raise NotImplementedError + + @abstractmethod + async def set_logging_level( + self, + level: types.LoggingLevel, + ) -> types.EmptyResult: + """Send a logging/setLevel request.""" + raise NotImplementedError + + @abstractmethod + async def list_resources( + self, + cursor: str | None = None, + ) -> types.ListResourcesResult: + """Send a resources/list request.""" + raise NotImplementedError + + @abstractmethod + async def list_resource_templates( + self, + cursor: str | None = None, + ) -> types.ListResourceTemplatesResult: + """Send a resources/templates/list request.""" + raise NotImplementedError + + @abstractmethod + async def read_resource(self, uri: AnyUrl) -> types.ReadResourceResult: + """Send a resources/read request.""" + raise NotImplementedError + + @abstractmethod + async def subscribe_resource(self, uri: AnyUrl) -> types.EmptyResult: + """Send a resources/subscribe request.""" + raise NotImplementedError + + @abstractmethod + async def unsubscribe_resource(self, uri: AnyUrl) -> types.EmptyResult: + """Send a resources/unsubscribe request.""" + raise NotImplementedError + + @abstractmethod + async def call_tool( + self, + name: str, + arguments: Any | None = None, + read_timeout_seconds: timedelta | None = None, + progress_callback: ProgressFnT | None = None, + ) -> types.CallToolResult: + """Send a tools/call request with optional progress callback support.""" + raise NotImplementedError + + @abstractmethod + async def list_prompts( + self, + cursor: str | None = None, + ) -> types.ListPromptsResult: + """Send a prompts/list request.""" + raise NotImplementedError + + @abstractmethod + async def get_prompt( + self, + name: str, + arguments: dict[str, str] | None = None, + ) -> types.GetPromptResult: + """Send a prompts/get request.""" + raise NotImplementedError + + @abstractmethod + async def complete( + self, + ref: types.ResourceTemplateReference | types.PromptReference, + argument: dict[str, str], + context_arguments: dict[str, str] | None = None, + ) -> types.CompleteResult: + """Send a completion/complete request.""" + raise NotImplementedError + + @abstractmethod + async def list_tools( + self, + cursor: str | None = None, + *, + params: types.PaginatedRequestParams | None = None, + ) -> types.ListToolsResult: + """Send a tools/list request. + + Args: + cursor: Simple cursor string for pagination (deprecated, use params instead) + params: Full pagination parameters including cursor and any future fields + """ + raise NotImplementedError + + @abstractmethod + async def send_roots_list_changed(self) -> None: + """Send a roots/list_changed notification.""" + raise NotImplementedError diff --git a/src/mcp/server/__init__.py b/src/mcp/server/__init__.py index 0feed368e4..81540c1f53 100644 --- a/src/mcp/server/__init__.py +++ b/src/mcp/server/__init__.py @@ -3,3 +3,9 @@ from .models import InitializationOptions __all__ = ["Server", "FastMCP", "NotificationOptions", "InitializationOptions"] + +try: + from mcp.server.grpc import start_grpc_server + __all__.append("start_grpc_server") +except ImportError: + pass diff --git a/src/mcp/server/elicitation.py b/src/mcp/server/elicitation.py index bba988f496..b2f33ec7ce 100644 --- a/src/mcp/server/elicitation.py +++ b/src/mcp/server/elicitation.py @@ -8,7 +8,7 @@ from pydantic import BaseModel from pydantic.fields import FieldInfo -from mcp.server.session import ServerSession +from mcp.server.transport_session import ServerTransportSession from mcp.types import RequestId ElicitSchemaModelT = TypeVar("ElicitSchemaModelT", bound=BaseModel) @@ -74,7 +74,7 @@ def _is_primitive_field(field_info: FieldInfo) -> bool: async def elicit_with_validation( - session: ServerSession, + session: ServerTransportSession, message: str, schema: type[ElicitSchemaModelT], related_request_id: RequestId | None = None, diff --git a/src/mcp/server/fastmcp/server.py b/src/mcp/server/fastmcp/server.py index 865b8e7e72..cc05403dd8 100644 --- a/src/mcp/server/fastmcp/server.py +++ b/src/mcp/server/fastmcp/server.py @@ -54,12 +54,13 @@ from mcp.server.lowlevel.server import LifespanResultT from mcp.server.lowlevel.server import Server as MCPServer from mcp.server.lowlevel.server import lifespan as default_lifespan -from mcp.server.session import ServerSession, ServerSessionT +from mcp.server.session import ServerSessionT from mcp.server.sse import SseServerTransport from mcp.server.stdio import stdio_server from mcp.server.streamable_http import EventStore from mcp.server.streamable_http_manager import StreamableHTTPSessionManager from mcp.server.transport_security import TransportSecuritySettings +from mcp.server.transport_session import ServerTransportSession from mcp.shared.context import LifespanContextT, RequestContext, RequestT from mcp.types import Annotations, AnyFunction, ContentBlock, GetPromptResult, Icon, ToolAnnotations from mcp.types import Prompt as MCPPrompt @@ -315,7 +316,7 @@ async def list_tools(self) -> list[MCPTool]: for info in tools ] - def get_context(self) -> Context[ServerSession, LifespanResultT, Request]: + def get_context(self) -> Context[ServerTransportSession, LifespanResultT, Request]: """ Returns a Context object. Note that the context will only be valid during a request; outside a request, most methods will error. diff --git a/src/mcp/server/grpc/__init__.py b/src/mcp/server/grpc/__init__.py new file mode 100644 index 0000000000..8bd27d6509 --- /dev/null +++ b/src/mcp/server/grpc/__init__.py @@ -0,0 +1,3 @@ +from mcp.server.grpc.server import start_grpc_server, McpGrpcServicer + +__all__ = ["start_grpc_server", "McpGrpcServicer"] diff --git a/src/mcp/server/grpc/server.py b/src/mcp/server/grpc/server.py new file mode 100644 index 0000000000..a7f734f265 --- /dev/null +++ b/src/mcp/server/grpc/server.py @@ -0,0 +1,700 @@ +""" +gRPC server transport for MCP. + +This module implements the server-side gRPC transport for MCP, allowing +an MCP server to be exposed over gRPC with support for native streaming +and bidirectional communication. +""" + +from __future__ import annotations + +import asyncio +import contextvars +import logging +from collections.abc import AsyncIterator +from typing import Any, TypeVar + +import grpc +from google.protobuf import struct_pb2 +from pydantic import AnyUrl + +import mcp.types as types +from mcp.server.lowlevel.server import Server, request_ctx +from mcp.server.transport_session import ServerTransportSession +from mcp.shared.context import RequestContext +from mcp.v1.mcp_pb2 import ( + CallToolResponse, + CallToolWithProgressResponse, + CompleteResponse, + CompletionResult, + GetPromptResponse, + InitializeResponse, + ListPromptsResponse, + ListResourcesResponse, + ListResourceTemplatesResponse, + ListToolsResponse, + PingResponse, + PromptMessage, + ReadResourceChunkedResponse, + ReadResourceResponse, + ResourceChangeType, + ResourceContents, + ServerCapabilities, + ServerInfo, + SessionResponse, + WatchResourcesResponse, +) +from mcp.v1.mcp_pb2_grpc import McpServiceServicer, add_McpServiceServicer_to_server + +logger = logging.getLogger(__name__) + +LifespanResultT = TypeVar("LifespanResultT") +RequestT = TypeVar("RequestT") + + +class GrpcServerSession(ServerTransportSession): + """ + gRPC implementation of ServerTransportSession. + + This session implementation handles the context for gRPC requests, + bridging the gap between the abstract ServerSession interface and + gRPC's execution model. + """ + + def __init__(self) -> None: + # In gRPC, we don't manage the stream lifecycle the same way as + # the persistent connection in stdio/SSE, as many RPCs are unary. + # This session object acts primarily as a handle for capabilities. + self._client_params: types.InitializeRequestParams | None = None + + @property + def client_params(self) -> types.InitializeRequestParams | None: + return self._client_params + + def check_client_capability(self, capability: types.ClientCapabilities) -> bool: + """Check if the client supports a specific capability.""" + if self._client_params is None: + return False + + # Get client capabilities from initialization params + client_caps = self._client_params.capabilities + + # Check each specified capability in the passed in capability object + if capability.roots is not None: + if client_caps.roots is None: + return False + if capability.roots.listChanged and not client_caps.roots.listChanged: + return False + + if capability.sampling is not None: + if client_caps.sampling is None: + return False + + if capability.elicitation is not None: + if client_caps.elicitation is None: + return False + + if capability.experimental is not None: + if client_caps.experimental is None: + return False + # Check each experimental capability + for exp_key, exp_value in capability.experimental.items(): + if exp_key not in client_caps.experimental or client_caps.experimental[exp_key] != exp_value: + return False + + return True + + async def send_log_message( + self, + level: types.LoggingLevel, + data: Any, + logger_name: str | None = None, + related_request_id: types.RequestId | None = None, + ) -> None: + # For unary RPCs, we can't push log messages back easily unless + # we are in the Session bidirectional stream. + # TODO: Implement side-channel logging for Session stream + logger.warning( + "Log message dropped (not implemented for unary gRPC): %s: %s", + level, data + ) + + async def send_progress_notification( + self, + progress_token: str | int, + progress: float, + total: float | None = None, + message: str | None = None, + related_request_id: str | None = None, + ) -> None: + # This is handled by specific streaming RPCs (CallToolWithProgress) + # or the Session stream. If called from a unary context, we log warning. + logger.warning( + "Progress notification dropped (not implemented for unary gRPC): %s", + progress + ) + + async def send_resource_updated(self, uri: AnyUrl) -> None: + logger.warning("Resource updated notification dropped (not implemented for unary gRPC)") + + async def send_resource_list_changed(self) -> None: + logger.warning("Resource list changed notification dropped (not implemented for unary gRPC)") + + async def send_tool_list_changed(self) -> None: + logger.warning("Tool list changed notification dropped (not implemented for unary gRPC)") + + async def send_prompt_list_changed(self) -> None: + logger.warning("Prompt list changed notification dropped (not implemented for unary gRPC)") + + async def list_roots(self) -> types.ListRootsResult: + logger.warning("List roots request dropped (not implemented for unary gRPC)") + return types.ListRootsResult(roots=[]) + + async def elicit( + self, + message: str, + requested_schema: types.ElicitRequestedSchema, + related_request_id: types.RequestId | None = None, + ) -> types.ElicitResult: + raise NotImplementedError("Elicitation not implemented for unary gRPC") + + async def send_ping(self) -> types.EmptyResult: + logger.warning("Ping request dropped (not implemented for unary gRPC)") + return types.EmptyResult() + + +class McpGrpcServicer(McpServiceServicer): + """ + Implements the McpService gRPC definition by delegating to an MCP Server instance. + """ + + def __init__(self, server: Server[Any, Any]): + self._server = server + self._session = GrpcServerSession() + + # ------------------------------------------------------------------------- + # Type Conversion Helpers + # ------------------------------------------------------------------------- + + @staticmethod + def _dict_to_struct(d: dict[str, Any] | None) -> struct_pb2.Struct: + """Convert a Python dict to protobuf Struct.""" + struct = struct_pb2.Struct() + if d: + struct.update(d) + return struct + + @staticmethod + def _struct_to_dict(struct: struct_pb2.Struct) -> dict[str, Any]: + """Convert protobuf Struct to Python dict.""" + from google.protobuf.json_format import MessageToDict + return MessageToDict(struct) + + def _convert_content_to_proto(self, content: types.TextContent | types.ImageContent | types.EmbeddedResource) -> Any: + """Convert MCP Content to proto Content.""" + from mcp.v1.mcp_pb2 import Content, ImageContent, TextContent + + if isinstance(content, types.TextContent): + return Content(text=TextContent(text=content.text)) + elif isinstance(content, types.ImageContent): + return Content(image=ImageContent(data=content.data, mime_type=content.mimeType)) + # TODO: Handle EmbeddedResource + return Content() + + def _convert_tool_to_proto(self, tool: types.Tool) -> Any: + """Convert MCP Tool to proto Tool.""" + from mcp.v1.mcp_pb2 import Tool + return Tool( + name=tool.name, + description=tool.description or "", + input_schema=self._dict_to_struct(tool.inputSchema) + ) + + def _convert_resource_to_proto(self, resource: types.Resource) -> Any: + """Convert MCP Resource to proto Resource.""" + from mcp.v1.mcp_pb2 import Resource + return Resource( + uri=str(resource.uri), + name=resource.name, + description=resource.description or "", + mime_type=resource.mimeType or "", + ) + + def _convert_prompt_to_proto(self, prompt: types.Prompt) -> Any: + """Convert MCP Prompt to proto Prompt.""" + from mcp.v1.mcp_pb2 import Prompt, PromptArgument + return Prompt( + name=prompt.name, + description=prompt.description or "", + arguments=[ + PromptArgument( + name=arg.name, + description=arg.description or "", + required=arg.required or False + ) for arg in (prompt.arguments or []) + ] + ) + + async def _execute_handler(self, request_type: type, request_obj: Any, context: grpc.ServicerContext) -> Any: + """ + Execute a registered handler for the given request type. + Sets up the request context needed by the handler. + """ + handler = self._server.request_handlers.get(request_type) + if not handler: + await context.abort(grpc.StatusCode.UNIMPLEMENTED, f"Method {request_type.__name__} not implemented") + else: + # Set up request context + # We use a unique ID for each request + import uuid + token = request_ctx.set( + RequestContext( + request_id=str(uuid.uuid4()), + meta=None, + session=self._session, + lifespan_context={}, + ) + ) + + try: + result = await handler(request_obj) + return result + except Exception as e: + logger.exception("Error handling gRPC request") + await context.abort(grpc.StatusCode.INTERNAL, str(e)) + finally: + request_ctx.reset(token) + + # ------------------------------------------------------------------------- + # RPC Implementations + # ------------------------------------------------------------------------- + + async def Initialize(self, request, context): + """Initialize the session.""" + + # Populate session with client params + self._session._client_params = types.InitializeRequestParams( + protocolVersion=request.protocol_version, + capabilities=types.ClientCapabilities( + roots=types.RootsCapability(listChanged=request.capabilities.roots.list_changed) if request.capabilities.HasField("roots") else None, + sampling=types.SamplingCapability() if request.capabilities.HasField("sampling") else None, + experimental={k: v for k, v in request.capabilities.experimental.capabilities.items()} if request.capabilities.HasField("experimental") else None + ), + clientInfo=types.Implementation( + name=request.client_info.name, + version=request.client_info.version + ) + ) + + # Convert proto to internal options + # We manually construct what the server expects for initialization + # The Server.create_initialization_options normally takes internal types + # Here we are just bridging the handshake + + init_opts = self._server.create_initialization_options() + + # Convert internal ServerCapabilities to proto ServerCapabilities + caps = ServerCapabilities() + if init_opts.capabilities.prompts: + caps.prompts.list_changed = init_opts.capabilities.prompts.listChanged or False + if init_opts.capabilities.resources: + caps.resources.subscribe = init_opts.capabilities.resources.subscribe or False + caps.resources.list_changed = init_opts.capabilities.resources.listChanged or False + if init_opts.capabilities.tools: + caps.tools.list_changed = init_opts.capabilities.tools.listChanged or False + + return InitializeResponse( + protocol_version=types.LATEST_PROTOCOL_VERSION, + server_info=ServerInfo( + name=init_opts.server_name, + version=init_opts.server_version + ), + capabilities=caps, + instructions=init_opts.instructions or "" + ) + + async def Ping(self, request, context): + """Ping.""" + await self._execute_handler(types.PingRequest, types.PingRequest(), context) + return PingResponse() + + async def ListTools(self, request, context): + """ + List available tools. + + Note: The underlying Server implementation currently collects all tools + into a list before returning. While we stream the response to the client, + true end-to-end streaming requires updates to mcp.server.lowlevel.server + to support async generators. + """ + req = types.ListToolsRequest( + params=types.PaginatedRequestParams(cursor=None) + ) + result = await self._execute_handler(types.ListToolsRequest, req, context) + + if isinstance(result, types.ServerResult): + # result.root is ListToolsResult + tools_result = result.root + for tool in tools_result.tools: + yield ListToolsResponse(tool=self._convert_tool_to_proto(tool)) + + async def CallTool(self, request, context): + """Call a tool (unary).""" + req = types.CallToolRequest( + params=types.CallToolRequestParams( + name=request.name, + arguments=self._struct_to_dict(request.arguments) + ) + ) + + result = await self._execute_handler(types.CallToolRequest, req, context) + + if isinstance(result, types.ServerResult): + call_result = result.root + return CallToolResponse( + content=[self._convert_content_to_proto(c) for c in call_result.content], + is_error=call_result.isError + ) + return CallToolResponse(is_error=True) + + async def CallToolWithProgress(self, request, context): + """Call a tool with streaming progress updates.""" + # This requires a special handler execution that captures progress notifications + # and streams them back. + + # We need a custom session that intercepts progress + progress_queue = asyncio.Queue() + + class StreamingSession(GrpcServerSession): + async def send_progress_notification(self, progress_token, progress, total=None, message=None, related_request_id=None): + from mcp.v1.mcp_pb2 import ProgressNotification, ProgressToken + token_msg = ProgressToken() + if isinstance(progress_token, int): + token_msg.int_token = progress_token + else: + token_msg.string_token = str(progress_token) + + await progress_queue.put( + CallToolWithProgressResponse( + progress=ProgressNotification( + progress_token=token_msg, + progress=progress, + total=total or 0.0, + message=message or "" + ) + ) + ) + + req = types.CallToolRequest( + params=types.CallToolRequestParams( + name=request.name, + arguments=self._struct_to_dict(request.arguments) + ) + ) + + handler = self._server.request_handlers.get(types.CallToolRequest) + if not handler: + await context.abort(grpc.StatusCode.UNIMPLEMENTED, "Tool execution not implemented") + else: + async def run_handler(): + streaming_session = StreamingSession() + # Inherit client params/capabilities from the main session + streaming_session._client_params = self._session._client_params + + import uuid + token = request_ctx.set( + RequestContext( + request_id=str(uuid.uuid4()), + meta=None, + session=streaming_session, + lifespan_context={}, + ) + ) + try: + result = await handler(req) + return result + finally: + request_ctx.reset(token) + + # Run handler in background task while we stream queue + task = asyncio.create_task(run_handler()) + + while not task.done(): + # Wait for either a progress update or task completion + done, pending = await asyncio.wait( + [task, asyncio.create_task(progress_queue.get())], + return_when=asyncio.FIRST_COMPLETED + ) + + for f in done: + if f is task: + # Task finished + try: + result = f.result() + if isinstance(result, types.ServerResult): + call_result = result.root + from mcp.v1.mcp_pb2 import ToolResult + yield CallToolWithProgressResponse( + result=ToolResult( + content=[self._convert_content_to_proto(c) for c in call_result.content], + is_error=call_result.isError + ) + ) + except Exception as e: + logger.exception("Error in streaming tool call") + # gRPC stream error + await context.abort(grpc.StatusCode.INTERNAL, str(e)) + else: + # Progress update + update = f.result() + yield update + + # Drain any remaining progress + while not progress_queue.empty(): + yield progress_queue.get_nowait() + + async def ListResources(self, request, context): + """ + List resources. + + Note: Currently buffers all resources from the Server handler. + Future optimization: Support async iterators in Server handlers. + """ + req = types.ListResourcesRequest( + params=types.PaginatedRequestParams(cursor=None) + ) + result = await self._execute_handler(types.ListResourcesRequest, req, context) + + if isinstance(result, types.ServerResult): + res_result = result.root + for r in res_result.resources: + yield ListResourcesResponse(resource=self._convert_resource_to_proto(r)) + + async def ListResourceTemplates(self, request, context): + """ + List resource templates. + + Note: Currently buffers results from the Server handler. + """ + req = types.ListResourceTemplatesRequest( + params=types.PaginatedRequestParams(cursor=None) + ) + result = await self._execute_handler(types.ListResourceTemplatesRequest, req, context) + + if isinstance(result, types.ServerResult): + res_result = result.root + from mcp.v1.mcp_pb2 import ResourceTemplate + for t in res_result.resourceTemplates: + yield ListResourceTemplatesResponse( + resource_template=ResourceTemplate( + uri_template=t.uriTemplate, + name=t.name, + description=t.description or "", + mime_type=t.mimeType or "" + ) + ) + + async def ReadResource(self, request, context): + """Read a resource.""" + req = types.ReadResourceRequest( + params=types.ReadResourceRequestParams(uri=AnyUrl(request.uri)) + ) + result = await self._execute_handler(types.ReadResourceRequest, req, context) + + if isinstance(result, types.ServerResult): + read_result = result.root + contents = [] + for c in read_result.contents: + msg = ResourceContents( + uri=str(c.uri), + mime_type=c.mimeType or "" + ) + if isinstance(c, types.TextResourceContents): + msg.text = c.text + elif isinstance(c, types.BlobResourceContents): + import base64 + msg.blob = base64.b64decode(c.blob) + contents.append(msg) + + return ReadResourceResponse(contents=contents) + return ReadResourceResponse() + + async def ReadResourceChunked(self, request, context): + """ + Read a resource in chunks. + + Note: The underlying read_resource handler currently returns the full content + (or a full list of contents), which we then chunk. True streaming from the + source is not yet supported by the Server class. + """ + req = types.ReadResourceRequest( + params=types.ReadResourceRequestParams(uri=AnyUrl(request.uri)) + ) + + # We reuse the standard ReadResource handler + # Note: Ideally the handler would support yielding chunks, but for now + # we get the full result and stream it back. + result = await self._execute_handler(types.ReadResourceRequest, req, context) + + if isinstance(result, types.ServerResult): + read_result = result.root + for c in read_result.contents: + uri = str(c.uri) + mime_type = c.mimeType or "" + + if isinstance(c, types.TextResourceContents): + text = c.text + # Chunk text to ensure messages stay within reasonable limits + # 8192 chars * 4 bytes/char (max utf8) = ~32KB, well within default 4MB limit + chunk_size = 8192 + if not text: + yield ReadResourceChunkedResponse( + uri=uri, + mime_type=mime_type, + text_chunk="", + is_final=True + ) + else: + for i in range(0, len(text), chunk_size): + chunk = text[i : i + chunk_size] + is_last = (i + chunk_size) >= len(text) + yield ReadResourceChunkedResponse( + uri=uri, + mime_type=mime_type, + text_chunk=chunk, + is_final=is_last + ) + + elif isinstance(c, types.BlobResourceContents): + import base64 + # Blob is base64 encoded in the Pydantic model + # But gRPC expects raw bytes in blob_chunk + blob_data = base64.b64decode(c.blob) + + # 64KB chunk size for binary data + chunk_size = 64 * 1024 + if not blob_data: + yield ReadResourceChunkedResponse( + uri=uri, + mime_type=mime_type, + blob_chunk=b"", + is_final=True + ) + else: + for i in range(0, len(blob_data), chunk_size): + chunk = blob_data[i : i + chunk_size] + is_last = (i + chunk_size) >= len(blob_data) + yield ReadResourceChunkedResponse( + uri=uri, + mime_type=mime_type, + blob_chunk=chunk, + is_final=is_last + ) + + async def ListPrompts(self, request, context): + """ + List prompts. + + Note: Currently buffers results from the Server handler. + """ + req = types.ListPromptsRequest( + params=types.PaginatedRequestParams(cursor=None) + ) + result = await self._execute_handler(types.ListPromptsRequest, req, context) + + if isinstance(result, types.ServerResult): + prompts_result = result.root + for p in prompts_result.prompts: + yield ListPromptsResponse(prompt=self._convert_prompt_to_proto(p)) + + async def GetPrompt(self, request, context): + """Get a prompt.""" + req = types.GetPromptRequest( + params=types.GetPromptRequestParams( + name=request.name, + arguments=dict(request.arguments) + ) + ) + result = await self._execute_handler(types.GetPromptRequest, req, context) + + if isinstance(result, types.ServerResult): + prompt_result = result.root + messages = [] + for m in prompt_result.messages: + # Convert Role enum + from mcp.v1.mcp_pb2 import Role + role = Role.ROLE_USER if m.role == "user" else Role.ROLE_ASSISTANT + + messages.append(PromptMessage( + role=role, + content=self._convert_content_to_proto(m.content) + )) + + return GetPromptResponse( + description=prompt_result.description or "", + messages=messages + ) + return GetPromptResponse() + + async def Complete(self, request, context): + """Autocomplete.""" + # Map proto reference to internal reference + ref: types.PromptReference | types.ResourceTemplateReference + if request.HasField("prompt_ref"): + ref = types.PromptReference(name=request.prompt_ref.name) + else: + ref = types.ResourceTemplateReference(uri=request.resource_template_ref.uri) + + req = types.CompleteRequest( + params=types.CompleteRequestParams( + ref=ref, + argument=types.CompletionArgument( + name=request.argument_name, + value=request.argument_value + ) + ) + ) + + result = await self._execute_handler(types.CompleteRequest, req, context) + + if isinstance(result, types.ServerResult): + comp_result = result.root.completion + return CompleteResponse( + completion=CompletionResult( + values=comp_result.values, + total=comp_result.total or 0, + has_more=comp_result.hasMore or False + ) + ) + return CompleteResponse() + + +async def start_grpc_server( + server: Server, + address: str = "[::]:50051", + ssl_key_chain: tuple[bytes, bytes] | None = None +) -> grpc.aio.Server: + """ + Start a gRPC server serving the given MCP server instance. + + Args: + server: The MCP server instance (from mcp.server.lowlevel.server) + address: The address to bind to (default: "[::]:50051") + ssl_key_chain: Optional (private_key, certificate_chain) for SSL/TLS + + Returns: + The started grpc.aio.Server instance. + """ + grpc_server = grpc.aio.server() + servicer = McpGrpcServicer(server) + add_McpServiceServicer_to_server(servicer, grpc_server) + + if ssl_key_chain: + server_credentials = grpc.ssl_server_credentials([ssl_key_chain]) + grpc_server.add_secure_port(address, server_credentials) + else: + grpc_server.add_insecure_port(address) + + logger.info("Starting MCP gRPC server on %s", address) + await grpc_server.start() + return grpc_server diff --git a/src/mcp/server/lowlevel/server.py b/src/mcp/server/lowlevel/server.py index 49d289fb75..85846afc6e 100644 --- a/src/mcp/server/lowlevel/server.py +++ b/src/mcp/server/lowlevel/server.py @@ -86,6 +86,7 @@ async def main(): from mcp.server.lowlevel.helper_types import ReadResourceContents from mcp.server.models import InitializationOptions from mcp.server.session import ServerSession +from mcp.server.transport_session import ServerTransportSession from mcp.shared.context import RequestContext from mcp.shared.exceptions import McpError from mcp.shared.message import ServerMessageMetadata, SessionMessage @@ -102,7 +103,9 @@ async def main(): CombinationContent: TypeAlias = tuple[UnstructuredContent, StructuredContent] # This will be properly typed in each Server instance's context -request_ctx: contextvars.ContextVar[RequestContext[ServerSession, Any, Any]] = contextvars.ContextVar("request_ctx") +request_ctx: contextvars.ContextVar[RequestContext[ServerTransportSession, Any, Any]] = contextvars.ContextVar( + "request_ctx" +) class NotificationOptions: @@ -231,7 +234,7 @@ def get_capabilities( @property def request_context( self, - ) -> RequestContext[ServerSession, LifespanResultT, RequestT]: + ) -> RequestContext[ServerTransportSession, LifespanResultT, RequestT]: """If called outside of a request context, this will raise a LookupError.""" return request_ctx.get() diff --git a/src/mcp/server/session.py b/src/mcp/server/session.py index a1bfadc9fc..9456ebf9fd 100644 --- a/src/mcp/server/session.py +++ b/src/mcp/server/session.py @@ -47,6 +47,7 @@ async def handle_list_prompts(ctx: RequestContext) -> list[types.Prompt]: import mcp.types as types from mcp.server.models import InitializationOptions +from mcp.server.transport_session import ServerTransportSession from mcp.shared.message import ServerMessageMetadata, SessionMessage from mcp.shared.session import ( BaseSession, @@ -61,7 +62,7 @@ class InitializationState(Enum): Initialized = 3 -ServerSessionT = TypeVar("ServerSessionT", bound="ServerSession") +ServerSessionT = TypeVar("ServerSessionT", bound="ServerTransportSession") ServerRequestResponder = ( RequestResponder[types.ClientRequest, types.ServerResult] | types.ClientNotification | Exception @@ -69,13 +70,14 @@ class InitializationState(Enum): class ServerSession( + ServerTransportSession, BaseSession[ types.ServerRequest, types.ServerNotification, types.ServerResult, types.ClientRequest, types.ClientNotification, - ] + ], ): _initialized: InitializationState = InitializationState.NotInitialized _client_params: types.InitializeRequestParams | None = None diff --git a/src/mcp/server/transport_session.py b/src/mcp/server/transport_session.py new file mode 100644 index 0000000000..bf3f6a1d1c --- /dev/null +++ b/src/mcp/server/transport_session.py @@ -0,0 +1,75 @@ +"""Abstract base class for transport sessions.""" + +from abc import ABC, abstractmethod +from typing import Any + +from pydantic import AnyUrl + +import mcp.types as types + + +class ServerTransportSession(ABC): + """Abstract base class for transport sessions.""" + + @abstractmethod + async def send_log_message( + self, + level: types.LoggingLevel, + data: Any, + logger: str | None = None, + related_request_id: types.RequestId | None = None, + ) -> None: + """Send a log message notification.""" + raise NotImplementedError + + @abstractmethod + async def send_resource_updated(self, uri: AnyUrl) -> None: + """Send a resource updated notification.""" + raise NotImplementedError + + @abstractmethod + async def list_roots(self) -> types.ListRootsResult: + """Send a roots/list request.""" + raise NotImplementedError + + @abstractmethod + async def elicit( + self, + message: str, + requestedSchema: types.ElicitRequestedSchema, + related_request_id: types.RequestId | None = None, + ) -> types.ElicitResult: + """Send an elicitation/create request.""" + raise NotImplementedError + + @abstractmethod + async def send_ping(self) -> types.EmptyResult: + """Send a ping request.""" + raise NotImplementedError + + @abstractmethod + async def send_progress_notification( + self, + progress_token: str | int, + progress: float, + total: float | None = None, + message: str | None = None, + related_request_id: str | None = None, + ) -> None: + """Send a progress notification.""" + raise NotImplementedError + + @abstractmethod + async def send_resource_list_changed(self) -> None: + """Send a resource list changed notification.""" + raise NotImplementedError + + @abstractmethod + async def send_tool_list_changed(self) -> None: + """Send a tool list changed notification.""" + raise NotImplementedError + + @abstractmethod + async def send_prompt_list_changed(self) -> None: + """Send a prompt list changed notification.""" + raise NotImplementedError diff --git a/src/mcp/shared/context.py b/src/mcp/shared/context.py index f3006e7d5f..7267f4954c 100644 --- a/src/mcp/shared/context.py +++ b/src/mcp/shared/context.py @@ -1,12 +1,17 @@ from dataclasses import dataclass -from typing import Any, Generic +from typing import TYPE_CHECKING, Any, Generic from typing_extensions import TypeVar from mcp.shared.session import BaseSession from mcp.types import RequestId, RequestParams -SessionT = TypeVar("SessionT", bound=BaseSession[Any, Any, Any, Any, Any]) +if TYPE_CHECKING: + from mcp import ClientTransportSession, ServerTransportSession + +SessionT = TypeVar( + "SessionT", bound=BaseSession[Any, Any, Any, Any, Any] | "ClientTransportSession" | "ServerTransportSession" +) LifespanContextT = TypeVar("LifespanContextT") RequestT = TypeVar("RequestT", default=Any) diff --git a/src/mcp/shared/memory.py b/src/mcp/shared/memory.py index 06d404e311..2d203d7430 100644 --- a/src/mcp/shared/memory.py +++ b/src/mcp/shared/memory.py @@ -13,7 +13,15 @@ from anyio.streams.memory import MemoryObjectReceiveStream, MemoryObjectSendStream import mcp.types as types -from mcp.client.session import ClientSession, ElicitationFnT, ListRootsFnT, LoggingFnT, MessageHandlerFnT, SamplingFnT +from mcp.client.session import ( + ClientSession, + ElicitationFnT, + ListRootsFnT, + LoggingFnT, + MessageHandlerFnT, + SamplingFnT, +) +from mcp.client.transport_session import ClientTransportSession from mcp.server import Server from mcp.server.fastmcp import FastMCP from mcp.shared.message import SessionMessage @@ -57,7 +65,7 @@ async def create_connected_server_and_client_session( client_info: types.Implementation | None = None, raise_exceptions: bool = False, elicitation_callback: ElicitationFnT | None = None, -) -> AsyncGenerator[ClientSession, None]: +) -> AsyncGenerator[ClientTransportSession, None]: """Creates a ClientSession that is connected to a running MCP server.""" # TODO(Marcelo): we should have a proper `Client` that can use this "in-memory transport", diff --git a/src/mcp/v1/__init__.py b/src/mcp/v1/__init__.py new file mode 100644 index 0000000000..e69de29bb2 diff --git a/src/mcp/v1/mcp_pb2.py b/src/mcp/v1/mcp_pb2.py new file mode 100644 index 0000000000..826a23f920 --- /dev/null +++ b/src/mcp/v1/mcp_pb2.py @@ -0,0 +1,194 @@ +# -*- coding: utf-8 -*- +# Generated by the protocol buffer compiler. DO NOT EDIT! +# NO CHECKED-IN PROTOBUF GENCODE +# source: mcp/v1/mcp.proto +# Protobuf Python Version: 6.31.1 +"""Generated protocol buffer code.""" +from google.protobuf import descriptor as _descriptor +from google.protobuf import descriptor_pool as _descriptor_pool +from google.protobuf import runtime_version as _runtime_version +from google.protobuf import symbol_database as _symbol_database +from google.protobuf.internal import builder as _builder +_runtime_version.ValidateProtobufRuntimeVersion( + _runtime_version.Domain.PUBLIC, + 6, + 31, + 1, + '', + 'mcp/v1/mcp.proto' +) +# @@protoc_insertion_point(imports) + +_sym_db = _symbol_database.Default() + + +from google.protobuf import any_pb2 as google_dot_protobuf_dot_any__pb2 +from google.protobuf import struct_pb2 as google_dot_protobuf_dot_struct__pb2 +from google.protobuf import timestamp_pb2 as google_dot_protobuf_dot_timestamp__pb2 + + +DESCRIPTOR = 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+ +_globals = globals() +_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals) +_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'mcp.v1.mcp_pb2', _globals) +if not _descriptor._USE_C_DESCRIPTORS: + _globals['DESCRIPTOR']._loaded_options = None + _globals['DESCRIPTOR']._serialized_options = b'\n\036io.modelcontextprotocol.api.v1P\001Z,github.com/modelcontextprotocol/go-sdk/mcpv1' + _globals['_METADATA_ANNOTATIONSENTRY']._loaded_options = None + _globals['_METADATA_ANNOTATIONSENTRY']._serialized_options = b'8\001' + _globals['_EXPERIMENTALCAPABILITIES_CAPABILITIESENTRY']._loaded_options = None + _globals['_EXPERIMENTALCAPABILITIES_CAPABILITIESENTRY']._serialized_options = b'8\001' + _globals['_GETPROMPTREQUEST_ARGUMENTSENTRY']._loaded_options = None + _globals['_GETPROMPTREQUEST_ARGUMENTSENTRY']._serialized_options = b'8\001' + _globals['_STREAMPROMPTCOMPLETIONREQUEST_ARGUMENTSENTRY']._loaded_options = None + 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_globals['_SERVERINFO']._serialized_start=680 + _globals['_SERVERINFO']._serialized_end=723 + _globals['_CLIENTCAPABILITIES']._serialized_start=726 + _globals['_CLIENTCAPABILITIES']._serialized_end=888 + _globals['_SERVERCAPABILITIES']._serialized_start=891 + _globals['_SERVERCAPABILITIES']._serialized_end=1143 + _globals['_ROOTSCAPABILITY']._serialized_start=1145 + _globals['_ROOTSCAPABILITY']._serialized_end=1184 + _globals['_SAMPLINGCAPABILITY']._serialized_start=1186 + _globals['_SAMPLINGCAPABILITY']._serialized_end=1206 + _globals['_PROMPTSCAPABILITY']._serialized_start=1208 + _globals['_PROMPTSCAPABILITY']._serialized_end=1249 + _globals['_RESOURCESCAPABILITY']._serialized_start=1251 + _globals['_RESOURCESCAPABILITY']._serialized_end=1313 + _globals['_TOOLSCAPABILITY']._serialized_start=1315 + _globals['_TOOLSCAPABILITY']._serialized_end=1354 + _globals['_LOGGINGCAPABILITY']._serialized_start=1356 + _globals['_LOGGINGCAPABILITY']._serialized_end=1375 + 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_globals['_CALLTOOLRESPONSE']._serialized_start=2004 + _globals['_CALLTOOLRESPONSE']._serialized_end=2074 + _globals['_CALLTOOLWITHPROGRESSREQUEST']._serialized_start=2077 + _globals['_CALLTOOLWITHPROGRESSREQUEST']._serialized_end=2211 + _globals['_CALLTOOLWITHPROGRESSRESPONSE']._serialized_start=2214 + _globals['_CALLTOOLWITHPROGRESSRESPONSE']._serialized_end=2342 + _globals['_STREAMTOOLCALLSREQUEST']._serialized_start=2344 + _globals['_STREAMTOOLCALLSREQUEST']._serialized_end=2446 + _globals['_STREAMTOOLCALLSRESPONSE']._serialized_start=2448 + _globals['_STREAMTOOLCALLSRESPONSE']._serialized_end=2545 + _globals['_TOOLRESULT']._serialized_start=2547 + _globals['_TOOLRESULT']._serialized_end=2611 + _globals['_PROGRESSNOTIFICATION']._serialized_start=2613 + _globals['_PROGRESSNOTIFICATION']._serialized_end=2732 + _globals['_CONTENT']._serialized_start=2735 + _globals['_CONTENT']._serialized_end=2965 + _globals['_TEXTCONTENT']._serialized_start=2967 + _globals['_TEXTCONTENT']._serialized_end=2994 + _globals['_IMAGECONTENT']._serialized_start=2996 + _globals['_IMAGECONTENT']._serialized_end=3043 + _globals['_AUDIOCONTENT']._serialized_start=3045 + _globals['_AUDIOCONTENT']._serialized_end=3092 + _globals['_EMBEDDEDRESOURCE']._serialized_start=3094 + _globals['_EMBEDDEDRESOURCE']._serialized_end=3156 + _globals['_CONTENTANNOTATIONS']._serialized_start=3158 + _globals['_CONTENTANNOTATIONS']._serialized_end=3228 + _globals['_RESOURCE']._serialized_start=3230 + _globals['_RESOURCE']._serialized_end=3357 + _globals['_RESOURCETEMPLATE']._serialized_start=3359 + _globals['_RESOURCETEMPLATE']._serialized_end=3453 + _globals['_LISTRESOURCESREQUEST']._serialized_start=3455 + _globals['_LISTRESOURCESREQUEST']._serialized_end=3477 + _globals['_LISTRESOURCESRESPONSE']._serialized_start=3479 + _globals['_LISTRESOURCESRESPONSE']._serialized_end=3538 + _globals['_LISTRESOURCETEMPLATESREQUEST']._serialized_start=3540 + _globals['_LISTRESOURCETEMPLATESREQUEST']._serialized_end=3570 + _globals['_LISTRESOURCETEMPLATESRESPONSE']._serialized_start=3572 + _globals['_LISTRESOURCETEMPLATESRESPONSE']._serialized_end=3656 + _globals['_READRESOURCEREQUEST']._serialized_start=3658 + _globals['_READRESOURCEREQUEST']._serialized_end=3692 + _globals['_READRESOURCERESPONSE']._serialized_start=3694 + _globals['_READRESOURCERESPONSE']._serialized_end=3760 + _globals['_READRESOURCECHUNKEDREQUEST']._serialized_start=3762 + _globals['_READRESOURCECHUNKEDREQUEST']._serialized_end=3839 + _globals['_READRESOURCECHUNKEDRESPONSE']._serialized_start=3842 + _globals['_READRESOURCECHUNKEDRESPONSE']._serialized_end=4012 + _globals['_RESOURCECONTENTS']._serialized_start=4014 + _globals['_RESOURCECONTENTS']._serialized_end=4107 + _globals['_WATCHRESOURCESREQUEST']._serialized_start=4109 + _globals['_WATCHRESOURCESREQUEST']._serialized_end=4179 + _globals['_WATCHRESOURCESRESPONSE']._serialized_start=4182 + _globals['_WATCHRESOURCESRESPONSE']._serialized_end=4359 + _globals['_PROMPT']._serialized_start=4361 + _globals['_PROMPT']._serialized_end=4447 + _globals['_PROMPTARGUMENT']._serialized_start=4449 + _globals['_PROMPTARGUMENT']._serialized_end=4518 + _globals['_LISTPROMPTSREQUEST']._serialized_start=4520 + _globals['_LISTPROMPTSREQUEST']._serialized_end=4540 + _globals['_LISTPROMPTSRESPONSE']._serialized_start=4542 + _globals['_LISTPROMPTSRESPONSE']._serialized_end=4595 + _globals['_GETPROMPTREQUEST']._serialized_start=4598 + _globals['_GETPROMPTREQUEST']._serialized_end=4740 + _globals['_GETPROMPTREQUEST_ARGUMENTSENTRY']._serialized_start=4692 + _globals['_GETPROMPTREQUEST_ARGUMENTSENTRY']._serialized_end=4740 + _globals['_GETPROMPTRESPONSE']._serialized_start=4742 + _globals['_GETPROMPTRESPONSE']._serialized_end=4823 + _globals['_STREAMPROMPTCOMPLETIONREQUEST']._serialized_start=4826 + _globals['_STREAMPROMPTCOMPLETIONREQUEST']._serialized_end=4994 + _globals['_STREAMPROMPTCOMPLETIONREQUEST_ARGUMENTSENTRY']._serialized_start=4692 + _globals['_STREAMPROMPTCOMPLETIONREQUEST_ARGUMENTSENTRY']._serialized_end=4740 + _globals['_STREAMPROMPTCOMPLETIONRESPONSE']._serialized_start=4996 + _globals['_STREAMPROMPTCOMPLETIONRESPONSE']._serialized_end=5084 + _globals['_PROMPTMESSAGE']._serialized_start=5086 + _globals['_PROMPTMESSAGE']._serialized_end=5163 + _globals['_COMPLETEREQUEST']._serialized_start=5166 + _globals['_COMPLETEREQUEST']._serialized_end=5340 + _globals['_RESOURCETEMPLATEREF']._serialized_start=5342 + _globals['_RESOURCETEMPLATEREF']._serialized_end=5390 + _globals['_PROMPTREF']._serialized_start=5392 + _globals['_PROMPTREF']._serialized_end=5431 + _globals['_COMPLETERESPONSE']._serialized_start=5433 + _globals['_COMPLETERESPONSE']._serialized_end=5497 + _globals['_COMPLETIONRESULT']._serialized_start=5499 + _globals['_COMPLETIONRESULT']._serialized_end=5566 + _globals['_SESSIONREQUEST']._serialized_start=5569 + _globals['_SESSIONREQUEST']._serialized_end=6367 + _globals['_SESSIONRESPONSE']._serialized_start=6370 + _globals['_SESSIONRESPONSE']._serialized_end=7243 + _globals['_ERRORRESPONSE']._serialized_start=7245 + _globals['_ERRORRESPONSE']._serialized_end=7327 + _globals['_CANCELREQUEST']._serialized_start=7329 + _globals['_CANCELREQUEST']._serialized_end=7364 + _globals['_MCPSERVICE']._serialized_start=7596 + _globals['_MCPSERVICE']._serialized_end=8862 +# @@protoc_insertion_point(module_scope) diff --git a/src/mcp/v1/mcp_pb2_grpc.py b/src/mcp/v1/mcp_pb2_grpc.py new file mode 100644 index 0000000000..afaf642a93 --- /dev/null +++ b/src/mcp/v1/mcp_pb2_grpc.py @@ -0,0 +1,787 @@ +# Generated by the gRPC Python protocol compiler plugin. DO NOT EDIT! +"""Client and server classes corresponding to protobuf-defined services.""" +import grpc +import warnings + +from mcp.v1 import mcp_pb2 as mcp_dot_v1_dot_mcp__pb2 + +GRPC_GENERATED_VERSION = '1.76.0' +GRPC_VERSION = grpc.__version__ +_version_not_supported = False + +try: + from grpc._utilities import first_version_is_lower + _version_not_supported = first_version_is_lower(GRPC_VERSION, GRPC_GENERATED_VERSION) +except ImportError: + _version_not_supported = True + +if _version_not_supported: + raise RuntimeError( + f'The grpc package installed is at version {GRPC_VERSION},' + + ' but the generated code in mcp/v1/mcp_pb2_grpc.py depends on' + + f' grpcio>={GRPC_GENERATED_VERSION}.' + + f' Please upgrade your grpc module to grpcio>={GRPC_GENERATED_VERSION}' + + f' or downgrade your generated code using grpcio-tools<={GRPC_VERSION}.' + ) + + +class McpServiceStub(object): + """============================================================================= + MCP Service Definition + ============================================================================= + + --- Lifecycle --- + """ + + def __init__(self, channel): + """Constructor. + + Args: + channel: A grpc.Channel. + """ + self.Initialize = channel.unary_unary( + '/mcp.v1.McpService/Initialize', + request_serializer=mcp_dot_v1_dot_mcp__pb2.InitializeRequest.SerializeToString, + response_deserializer=mcp_dot_v1_dot_mcp__pb2.InitializeResponse.FromString, + _registered_method=True) + self.Ping = channel.unary_unary( + '/mcp.v1.McpService/Ping', + request_serializer=mcp_dot_v1_dot_mcp__pb2.PingRequest.SerializeToString, + response_deserializer=mcp_dot_v1_dot_mcp__pb2.PingResponse.FromString, + _registered_method=True) + self.ListTools = channel.unary_stream( + '/mcp.v1.McpService/ListTools', + request_serializer=mcp_dot_v1_dot_mcp__pb2.ListToolsRequest.SerializeToString, + response_deserializer=mcp_dot_v1_dot_mcp__pb2.ListToolsResponse.FromString, + _registered_method=True) + self.CallTool = channel.unary_unary( + '/mcp.v1.McpService/CallTool', + request_serializer=mcp_dot_v1_dot_mcp__pb2.CallToolRequest.SerializeToString, + response_deserializer=mcp_dot_v1_dot_mcp__pb2.CallToolResponse.FromString, + _registered_method=True) + self.CallToolWithProgress = channel.unary_stream( + '/mcp.v1.McpService/CallToolWithProgress', + request_serializer=mcp_dot_v1_dot_mcp__pb2.CallToolWithProgressRequest.SerializeToString, + response_deserializer=mcp_dot_v1_dot_mcp__pb2.CallToolWithProgressResponse.FromString, + _registered_method=True) + self.StreamToolCalls = channel.stream_stream( + '/mcp.v1.McpService/StreamToolCalls', + request_serializer=mcp_dot_v1_dot_mcp__pb2.StreamToolCallsRequest.SerializeToString, + response_deserializer=mcp_dot_v1_dot_mcp__pb2.StreamToolCallsResponse.FromString, + _registered_method=True) + self.ListResources = channel.unary_stream( + '/mcp.v1.McpService/ListResources', + request_serializer=mcp_dot_v1_dot_mcp__pb2.ListResourcesRequest.SerializeToString, + response_deserializer=mcp_dot_v1_dot_mcp__pb2.ListResourcesResponse.FromString, + _registered_method=True) + self.ListResourceTemplates = channel.unary_stream( + '/mcp.v1.McpService/ListResourceTemplates', + request_serializer=mcp_dot_v1_dot_mcp__pb2.ListResourceTemplatesRequest.SerializeToString, + response_deserializer=mcp_dot_v1_dot_mcp__pb2.ListResourceTemplatesResponse.FromString, + _registered_method=True) + self.ReadResource = channel.unary_unary( + '/mcp.v1.McpService/ReadResource', + request_serializer=mcp_dot_v1_dot_mcp__pb2.ReadResourceRequest.SerializeToString, + response_deserializer=mcp_dot_v1_dot_mcp__pb2.ReadResourceResponse.FromString, + _registered_method=True) + self.ReadResourceChunked = channel.unary_stream( + '/mcp.v1.McpService/ReadResourceChunked', + request_serializer=mcp_dot_v1_dot_mcp__pb2.ReadResourceChunkedRequest.SerializeToString, + response_deserializer=mcp_dot_v1_dot_mcp__pb2.ReadResourceChunkedResponse.FromString, + _registered_method=True) + self.WatchResources = channel.unary_stream( + '/mcp.v1.McpService/WatchResources', + request_serializer=mcp_dot_v1_dot_mcp__pb2.WatchResourcesRequest.SerializeToString, + response_deserializer=mcp_dot_v1_dot_mcp__pb2.WatchResourcesResponse.FromString, + _registered_method=True) + self.ListPrompts = channel.unary_stream( + '/mcp.v1.McpService/ListPrompts', + request_serializer=mcp_dot_v1_dot_mcp__pb2.ListPromptsRequest.SerializeToString, + response_deserializer=mcp_dot_v1_dot_mcp__pb2.ListPromptsResponse.FromString, + _registered_method=True) + self.GetPrompt = channel.unary_unary( + '/mcp.v1.McpService/GetPrompt', + request_serializer=mcp_dot_v1_dot_mcp__pb2.GetPromptRequest.SerializeToString, + response_deserializer=mcp_dot_v1_dot_mcp__pb2.GetPromptResponse.FromString, + _registered_method=True) + self.StreamPromptCompletion = channel.unary_stream( + '/mcp.v1.McpService/StreamPromptCompletion', + request_serializer=mcp_dot_v1_dot_mcp__pb2.StreamPromptCompletionRequest.SerializeToString, + response_deserializer=mcp_dot_v1_dot_mcp__pb2.StreamPromptCompletionResponse.FromString, + _registered_method=True) + self.Complete = channel.unary_unary( + '/mcp.v1.McpService/Complete', + request_serializer=mcp_dot_v1_dot_mcp__pb2.CompleteRequest.SerializeToString, + response_deserializer=mcp_dot_v1_dot_mcp__pb2.CompleteResponse.FromString, + _registered_method=True) + self.Session = channel.stream_stream( + '/mcp.v1.McpService/Session', + request_serializer=mcp_dot_v1_dot_mcp__pb2.SessionRequest.SerializeToString, + response_deserializer=mcp_dot_v1_dot_mcp__pb2.SessionResponse.FromString, + _registered_method=True) + + +class McpServiceServicer(object): + """============================================================================= + MCP Service Definition + ============================================================================= + + --- Lifecycle --- + """ + + def Initialize(self, request, context): + """Initialize the MCP session and negotiate capabilities + """ + context.set_code(grpc.StatusCode.UNIMPLEMENTED) + context.set_details('Method not implemented!') + raise NotImplementedError('Method not implemented!') + + def Ping(self, request, context): + """Ping for health checks + """ + context.set_code(grpc.StatusCode.UNIMPLEMENTED) + context.set_details('Method not implemented!') + raise NotImplementedError('Method not implemented!') + + def ListTools(self, request, context): + """--- Tools --- + + List available tools (streaming) + """ + context.set_code(grpc.StatusCode.UNIMPLEMENTED) + context.set_details('Method not implemented!') + raise NotImplementedError('Method not implemented!') + + def CallTool(self, request, context): + """Call a tool - unary for simple calls + """ + context.set_code(grpc.StatusCode.UNIMPLEMENTED) + context.set_details('Method not implemented!') + raise NotImplementedError('Method not implemented!') + + def CallToolWithProgress(self, request, context): + """Call a tool with streaming progress updates + Server streams progress notifications, final message contains result + """ + context.set_code(grpc.StatusCode.UNIMPLEMENTED) + context.set_details('Method not implemented!') + raise NotImplementedError('Method not implemented!') + + def StreamToolCalls(self, request_iterator, context): + """Stream multiple tool calls - client streams requests, server streams results + Enables parallel tool execution with results as they complete + """ + context.set_code(grpc.StatusCode.UNIMPLEMENTED) + context.set_details('Method not implemented!') + raise NotImplementedError('Method not implemented!') + + def ListResources(self, request, context): + """--- Resources --- + + List available resources (streaming) + """ + context.set_code(grpc.StatusCode.UNIMPLEMENTED) + context.set_details('Method not implemented!') + raise NotImplementedError('Method not implemented!') + + def ListResourceTemplates(self, request, context): + """List resource templates (streaming) + """ + context.set_code(grpc.StatusCode.UNIMPLEMENTED) + context.set_details('Method not implemented!') + raise NotImplementedError('Method not implemented!') + + def ReadResource(self, request, context): + """Read a resource - unary for small resources + """ + context.set_code(grpc.StatusCode.UNIMPLEMENTED) + context.set_details('Method not implemented!') + raise NotImplementedError('Method not implemented!') + + def ReadResourceChunked(self, request, context): + """Read a large resource in chunks - server streams chunks + """ + context.set_code(grpc.StatusCode.UNIMPLEMENTED) + context.set_details('Method not implemented!') + raise NotImplementedError('Method not implemented!') + + def WatchResources(self, request, context): + """Subscribe to resource changes - server streams notifications + Replaces polling with push-based updates + """ + context.set_code(grpc.StatusCode.UNIMPLEMENTED) + context.set_details('Method not implemented!') + raise NotImplementedError('Method not implemented!') + + def ListPrompts(self, request, context): + """--- Prompts --- + + List available prompts (streaming) + """ + context.set_code(grpc.StatusCode.UNIMPLEMENTED) + context.set_details('Method not implemented!') + raise NotImplementedError('Method not implemented!') + + def GetPrompt(self, request, context): + """Get a prompt + """ + context.set_code(grpc.StatusCode.UNIMPLEMENTED) + context.set_details('Method not implemented!') + raise NotImplementedError('Method not implemented!') + + def StreamPromptCompletion(self, request, context): + """Stream prompt completion tokens as they're generated + """ + context.set_code(grpc.StatusCode.UNIMPLEMENTED) + context.set_details('Method not implemented!') + raise NotImplementedError('Method not implemented!') + + def Complete(self, request, context): + """--- Completion --- + + Autocomplete for resource templates or prompts + """ + context.set_code(grpc.StatusCode.UNIMPLEMENTED) + context.set_details('Method not implemented!') + raise NotImplementedError('Method not implemented!') + + def Session(self, request_iterator, context): + """--- Bidirectional Session Stream --- + + Full bidirectional stream for complex agent interactions + Enables any MCP operation over a single persistent connection + """ + context.set_code(grpc.StatusCode.UNIMPLEMENTED) + context.set_details('Method not implemented!') + raise NotImplementedError('Method not implemented!') + + +def add_McpServiceServicer_to_server(servicer, server): + rpc_method_handlers = { + 'Initialize': grpc.unary_unary_rpc_method_handler( + servicer.Initialize, + request_deserializer=mcp_dot_v1_dot_mcp__pb2.InitializeRequest.FromString, + response_serializer=mcp_dot_v1_dot_mcp__pb2.InitializeResponse.SerializeToString, + ), + 'Ping': grpc.unary_unary_rpc_method_handler( + servicer.Ping, + request_deserializer=mcp_dot_v1_dot_mcp__pb2.PingRequest.FromString, + response_serializer=mcp_dot_v1_dot_mcp__pb2.PingResponse.SerializeToString, + ), + 'ListTools': grpc.unary_stream_rpc_method_handler( + servicer.ListTools, + request_deserializer=mcp_dot_v1_dot_mcp__pb2.ListToolsRequest.FromString, + response_serializer=mcp_dot_v1_dot_mcp__pb2.ListToolsResponse.SerializeToString, + ), + 'CallTool': grpc.unary_unary_rpc_method_handler( + servicer.CallTool, + request_deserializer=mcp_dot_v1_dot_mcp__pb2.CallToolRequest.FromString, + response_serializer=mcp_dot_v1_dot_mcp__pb2.CallToolResponse.SerializeToString, + ), + 'CallToolWithProgress': grpc.unary_stream_rpc_method_handler( + servicer.CallToolWithProgress, + request_deserializer=mcp_dot_v1_dot_mcp__pb2.CallToolWithProgressRequest.FromString, + response_serializer=mcp_dot_v1_dot_mcp__pb2.CallToolWithProgressResponse.SerializeToString, + ), + 'StreamToolCalls': grpc.stream_stream_rpc_method_handler( + servicer.StreamToolCalls, + request_deserializer=mcp_dot_v1_dot_mcp__pb2.StreamToolCallsRequest.FromString, + response_serializer=mcp_dot_v1_dot_mcp__pb2.StreamToolCallsResponse.SerializeToString, + ), + 'ListResources': grpc.unary_stream_rpc_method_handler( + servicer.ListResources, + request_deserializer=mcp_dot_v1_dot_mcp__pb2.ListResourcesRequest.FromString, + response_serializer=mcp_dot_v1_dot_mcp__pb2.ListResourcesResponse.SerializeToString, + ), + 'ListResourceTemplates': grpc.unary_stream_rpc_method_handler( + servicer.ListResourceTemplates, + request_deserializer=mcp_dot_v1_dot_mcp__pb2.ListResourceTemplatesRequest.FromString, + response_serializer=mcp_dot_v1_dot_mcp__pb2.ListResourceTemplatesResponse.SerializeToString, + ), + 'ReadResource': grpc.unary_unary_rpc_method_handler( + servicer.ReadResource, + request_deserializer=mcp_dot_v1_dot_mcp__pb2.ReadResourceRequest.FromString, + response_serializer=mcp_dot_v1_dot_mcp__pb2.ReadResourceResponse.SerializeToString, + ), + 'ReadResourceChunked': grpc.unary_stream_rpc_method_handler( + servicer.ReadResourceChunked, + request_deserializer=mcp_dot_v1_dot_mcp__pb2.ReadResourceChunkedRequest.FromString, + response_serializer=mcp_dot_v1_dot_mcp__pb2.ReadResourceChunkedResponse.SerializeToString, + ), + 'WatchResources': grpc.unary_stream_rpc_method_handler( + servicer.WatchResources, + request_deserializer=mcp_dot_v1_dot_mcp__pb2.WatchResourcesRequest.FromString, + response_serializer=mcp_dot_v1_dot_mcp__pb2.WatchResourcesResponse.SerializeToString, + ), + 'ListPrompts': grpc.unary_stream_rpc_method_handler( + servicer.ListPrompts, + request_deserializer=mcp_dot_v1_dot_mcp__pb2.ListPromptsRequest.FromString, + response_serializer=mcp_dot_v1_dot_mcp__pb2.ListPromptsResponse.SerializeToString, + ), + 'GetPrompt': grpc.unary_unary_rpc_method_handler( + servicer.GetPrompt, + request_deserializer=mcp_dot_v1_dot_mcp__pb2.GetPromptRequest.FromString, + response_serializer=mcp_dot_v1_dot_mcp__pb2.GetPromptResponse.SerializeToString, + ), + 'StreamPromptCompletion': grpc.unary_stream_rpc_method_handler( + servicer.StreamPromptCompletion, + request_deserializer=mcp_dot_v1_dot_mcp__pb2.StreamPromptCompletionRequest.FromString, + response_serializer=mcp_dot_v1_dot_mcp__pb2.StreamPromptCompletionResponse.SerializeToString, + ), + 'Complete': grpc.unary_unary_rpc_method_handler( + servicer.Complete, + request_deserializer=mcp_dot_v1_dot_mcp__pb2.CompleteRequest.FromString, + response_serializer=mcp_dot_v1_dot_mcp__pb2.CompleteResponse.SerializeToString, + ), + 'Session': grpc.stream_stream_rpc_method_handler( + servicer.Session, + request_deserializer=mcp_dot_v1_dot_mcp__pb2.SessionRequest.FromString, + response_serializer=mcp_dot_v1_dot_mcp__pb2.SessionResponse.SerializeToString, + ), + } + generic_handler = grpc.method_handlers_generic_handler( + 'mcp.v1.McpService', rpc_method_handlers) + server.add_generic_rpc_handlers((generic_handler,)) + server.add_registered_method_handlers('mcp.v1.McpService', rpc_method_handlers) + + + # This class is part of an EXPERIMENTAL API. +class McpService(object): + """============================================================================= + MCP Service Definition + ============================================================================= + + --- Lifecycle --- + """ + + @staticmethod + def Initialize(request, + target, + options=(), + channel_credentials=None, + call_credentials=None, + insecure=False, + compression=None, + wait_for_ready=None, + timeout=None, + metadata=None): + return grpc.experimental.unary_unary( + request, + target, + '/mcp.v1.McpService/Initialize', + mcp_dot_v1_dot_mcp__pb2.InitializeRequest.SerializeToString, + mcp_dot_v1_dot_mcp__pb2.InitializeResponse.FromString, + options, + channel_credentials, + insecure, + call_credentials, + compression, + wait_for_ready, + timeout, + metadata, + _registered_method=True) + + @staticmethod + def Ping(request, + target, + options=(), + channel_credentials=None, + call_credentials=None, + insecure=False, + compression=None, + wait_for_ready=None, + timeout=None, + metadata=None): + return grpc.experimental.unary_unary( + request, + target, + '/mcp.v1.McpService/Ping', + mcp_dot_v1_dot_mcp__pb2.PingRequest.SerializeToString, + mcp_dot_v1_dot_mcp__pb2.PingResponse.FromString, + options, + channel_credentials, + insecure, + call_credentials, + compression, + wait_for_ready, + timeout, + metadata, + _registered_method=True) + + @staticmethod + def ListTools(request, + target, + options=(), + channel_credentials=None, + call_credentials=None, + insecure=False, + compression=None, + wait_for_ready=None, + timeout=None, + metadata=None): + return grpc.experimental.unary_stream( + request, + target, + '/mcp.v1.McpService/ListTools', + mcp_dot_v1_dot_mcp__pb2.ListToolsRequest.SerializeToString, + mcp_dot_v1_dot_mcp__pb2.ListToolsResponse.FromString, + options, + channel_credentials, + insecure, + call_credentials, + compression, + wait_for_ready, + timeout, + metadata, + _registered_method=True) + + @staticmethod + def CallTool(request, + target, + options=(), + channel_credentials=None, + call_credentials=None, + insecure=False, + compression=None, + wait_for_ready=None, + timeout=None, + metadata=None): + return grpc.experimental.unary_unary( + request, + target, + '/mcp.v1.McpService/CallTool', + mcp_dot_v1_dot_mcp__pb2.CallToolRequest.SerializeToString, + mcp_dot_v1_dot_mcp__pb2.CallToolResponse.FromString, + options, + channel_credentials, + insecure, + call_credentials, + compression, + wait_for_ready, + timeout, + metadata, + _registered_method=True) + + @staticmethod + def CallToolWithProgress(request, + target, + options=(), + channel_credentials=None, + call_credentials=None, + insecure=False, + compression=None, + wait_for_ready=None, + timeout=None, + metadata=None): + return grpc.experimental.unary_stream( + request, + target, + '/mcp.v1.McpService/CallToolWithProgress', + mcp_dot_v1_dot_mcp__pb2.CallToolWithProgressRequest.SerializeToString, + mcp_dot_v1_dot_mcp__pb2.CallToolWithProgressResponse.FromString, + options, + channel_credentials, + insecure, + call_credentials, + compression, + wait_for_ready, + timeout, + metadata, + _registered_method=True) + + @staticmethod + def StreamToolCalls(request_iterator, + target, + options=(), + channel_credentials=None, + call_credentials=None, + insecure=False, + compression=None, + wait_for_ready=None, + timeout=None, + metadata=None): + return grpc.experimental.stream_stream( + request_iterator, + target, + '/mcp.v1.McpService/StreamToolCalls', + mcp_dot_v1_dot_mcp__pb2.StreamToolCallsRequest.SerializeToString, + mcp_dot_v1_dot_mcp__pb2.StreamToolCallsResponse.FromString, + options, + channel_credentials, + insecure, + call_credentials, + compression, + wait_for_ready, + timeout, + metadata, + _registered_method=True) + + @staticmethod + def ListResources(request, + target, + options=(), + channel_credentials=None, + call_credentials=None, + insecure=False, + compression=None, + wait_for_ready=None, + timeout=None, + metadata=None): + return grpc.experimental.unary_stream( + request, + target, + '/mcp.v1.McpService/ListResources', + mcp_dot_v1_dot_mcp__pb2.ListResourcesRequest.SerializeToString, + mcp_dot_v1_dot_mcp__pb2.ListResourcesResponse.FromString, + options, + channel_credentials, + insecure, + call_credentials, + compression, + wait_for_ready, + timeout, + metadata, + _registered_method=True) + + @staticmethod + def ListResourceTemplates(request, + target, + options=(), + channel_credentials=None, + call_credentials=None, + insecure=False, + compression=None, + wait_for_ready=None, + timeout=None, + metadata=None): + return grpc.experimental.unary_stream( + request, + target, + '/mcp.v1.McpService/ListResourceTemplates', + mcp_dot_v1_dot_mcp__pb2.ListResourceTemplatesRequest.SerializeToString, + mcp_dot_v1_dot_mcp__pb2.ListResourceTemplatesResponse.FromString, + options, + channel_credentials, + insecure, + call_credentials, + compression, + wait_for_ready, + timeout, + metadata, + _registered_method=True) + + @staticmethod + def ReadResource(request, + target, + options=(), + channel_credentials=None, + call_credentials=None, + insecure=False, + compression=None, + wait_for_ready=None, + timeout=None, + metadata=None): + return grpc.experimental.unary_unary( + request, + target, + '/mcp.v1.McpService/ReadResource', + mcp_dot_v1_dot_mcp__pb2.ReadResourceRequest.SerializeToString, + mcp_dot_v1_dot_mcp__pb2.ReadResourceResponse.FromString, + options, + channel_credentials, + insecure, + call_credentials, + compression, + wait_for_ready, + timeout, + metadata, + _registered_method=True) + + @staticmethod + def ReadResourceChunked(request, + target, + options=(), + channel_credentials=None, + call_credentials=None, + insecure=False, + compression=None, + wait_for_ready=None, + timeout=None, + metadata=None): + return grpc.experimental.unary_stream( + request, + target, + '/mcp.v1.McpService/ReadResourceChunked', + mcp_dot_v1_dot_mcp__pb2.ReadResourceChunkedRequest.SerializeToString, + mcp_dot_v1_dot_mcp__pb2.ReadResourceChunkedResponse.FromString, + options, + channel_credentials, + insecure, + call_credentials, + compression, + wait_for_ready, + timeout, + metadata, + _registered_method=True) + + @staticmethod + def WatchResources(request, + target, + options=(), + channel_credentials=None, + call_credentials=None, + insecure=False, + compression=None, + wait_for_ready=None, + timeout=None, + metadata=None): + return grpc.experimental.unary_stream( + request, + target, + '/mcp.v1.McpService/WatchResources', + mcp_dot_v1_dot_mcp__pb2.WatchResourcesRequest.SerializeToString, + mcp_dot_v1_dot_mcp__pb2.WatchResourcesResponse.FromString, + options, + channel_credentials, + insecure, + call_credentials, + compression, + wait_for_ready, + timeout, + metadata, + _registered_method=True) + + @staticmethod + def ListPrompts(request, + target, + options=(), + channel_credentials=None, + call_credentials=None, + insecure=False, + compression=None, + wait_for_ready=None, + timeout=None, + metadata=None): + return grpc.experimental.unary_stream( + request, + target, + '/mcp.v1.McpService/ListPrompts', + mcp_dot_v1_dot_mcp__pb2.ListPromptsRequest.SerializeToString, + mcp_dot_v1_dot_mcp__pb2.ListPromptsResponse.FromString, + options, + channel_credentials, + insecure, + call_credentials, + compression, + wait_for_ready, + timeout, + metadata, + _registered_method=True) + + @staticmethod + def GetPrompt(request, + target, + options=(), + channel_credentials=None, + call_credentials=None, + insecure=False, + compression=None, + wait_for_ready=None, + timeout=None, + metadata=None): + return grpc.experimental.unary_unary( + request, + target, + '/mcp.v1.McpService/GetPrompt', + mcp_dot_v1_dot_mcp__pb2.GetPromptRequest.SerializeToString, + mcp_dot_v1_dot_mcp__pb2.GetPromptResponse.FromString, + options, + channel_credentials, + insecure, + call_credentials, + compression, + wait_for_ready, + timeout, + metadata, + _registered_method=True) + + @staticmethod + def StreamPromptCompletion(request, + target, + options=(), + channel_credentials=None, + call_credentials=None, + insecure=False, + compression=None, + wait_for_ready=None, + timeout=None, + metadata=None): + return grpc.experimental.unary_stream( + request, + target, + '/mcp.v1.McpService/StreamPromptCompletion', + mcp_dot_v1_dot_mcp__pb2.StreamPromptCompletionRequest.SerializeToString, + mcp_dot_v1_dot_mcp__pb2.StreamPromptCompletionResponse.FromString, + options, + channel_credentials, + insecure, + call_credentials, + compression, + wait_for_ready, + timeout, + metadata, + _registered_method=True) + + @staticmethod + def Complete(request, + target, + options=(), + channel_credentials=None, + call_credentials=None, + insecure=False, + compression=None, + wait_for_ready=None, + timeout=None, + metadata=None): + return grpc.experimental.unary_unary( + request, + target, + '/mcp.v1.McpService/Complete', + mcp_dot_v1_dot_mcp__pb2.CompleteRequest.SerializeToString, + mcp_dot_v1_dot_mcp__pb2.CompleteResponse.FromString, + options, + channel_credentials, + insecure, + call_credentials, + compression, + wait_for_ready, + timeout, + metadata, + _registered_method=True) + + @staticmethod + def Session(request_iterator, + target, + options=(), + channel_credentials=None, + call_credentials=None, + insecure=False, + compression=None, + wait_for_ready=None, + timeout=None, + metadata=None): + return grpc.experimental.stream_stream( + request_iterator, + target, + '/mcp.v1.McpService/Session', + mcp_dot_v1_dot_mcp__pb2.SessionRequest.SerializeToString, + mcp_dot_v1_dot_mcp__pb2.SessionResponse.FromString, + options, + channel_credentials, + insecure, + call_credentials, + compression, + wait_for_ready, + timeout, + metadata, + _registered_method=True) diff --git a/tests/client/grpc/__init__.py b/tests/client/grpc/__init__.py new file mode 100644 index 0000000000..4552794c8b --- /dev/null +++ b/tests/client/grpc/__init__.py @@ -0,0 +1 @@ +# gRPC transport tests diff --git a/tests/client/grpc/test_transport.py b/tests/client/grpc/test_transport.py new file mode 100644 index 0000000000..f408d6f16a --- /dev/null +++ b/tests/client/grpc/test_transport.py @@ -0,0 +1,136 @@ +""" +Tests for gRPC client transport. +""" + +from unittest.mock import AsyncMock, MagicMock + +import grpc +import pytest + +from mcp.client.transport_session import ClientTransportSession + + +class TestGrpcTransportInterface: + """Test that GrpcClientTransport implements ClientTransportSession correctly.""" + + def test_import_with_grpc(self) -> None: + """Test that GrpcClientTransport is available and is a ClientTransportSession.""" + from mcp.client.grpc import GrpcClientTransport + + assert issubclass(GrpcClientTransport, ClientTransportSession) + + def test_implements_all_abstract_methods(self) -> None: + """Verify GrpcClientTransport implements all required methods.""" + # Get all abstract methods from ClientTransportSession + import inspect + + from mcp.client.grpc import GrpcClientTransport + + abstract_methods = { + name + for name, method in inspect.getmembers( + ClientTransportSession, predicate=inspect.isfunction + ) + if getattr(method, "__isabstractmethod__", False) + } + + # Get all methods implemented by GrpcClientTransport + implemented_methods = { + name + for name, _ in inspect.getmembers( + GrpcClientTransport, predicate=inspect.isfunction + ) + } + + # Verify all abstract methods are implemented + missing = abstract_methods - implemented_methods + assert not missing, f"Missing implementations: {missing}" + + +class TestGrpcTransportInstantiation: + """Test GrpcClientTransport instantiation.""" + + def test_requires_target(self) -> None: + """Test that target is required.""" + from mcp.client.grpc import GrpcClientTransport + + with pytest.raises(TypeError): + GrpcClientTransport() # type: ignore[call-arg] + + def test_accepts_target(self) -> None: + """Test basic instantiation with target.""" + from mcp.client.grpc import GrpcClientTransport + + transport = GrpcClientTransport("localhost:50051") + assert transport._target == "localhost:50051" + + def test_not_connected_before_enter(self) -> None: + """Test that transport is not connected before context manager.""" + from mcp.client.grpc import GrpcClientTransport + + transport = GrpcClientTransport("localhost:50051") + assert transport._channel is None + assert transport._stub is None + + +@pytest.mark.anyio +class TestGrpcTransportFunctionality: + """Test GrpcClientTransport functionality using mocks.""" + + async def test_initialize(self) -> None: + """Test initialize call.""" + from mcp.client.grpc import GrpcClientTransport + from mcp.v1.mcp_pb2 import InitializeResponse + + transport = GrpcClientTransport("localhost:50051") + transport._stub = MagicMock() + + mock_response = InitializeResponse( + protocol_version="2024-11-05", + instructions="Test instructions", + ) + mock_response.server_info.name = "test-server" + mock_response.server_info.version = "1.0.0" + + transport._stub.Initialize = AsyncMock(return_value=mock_response) + + # Mock __aenter__ to avoid channel creation + transport._session_task = MagicMock() # Avoid task creation + + result = await transport.initialize() + + assert result.protocolVersion == "2024-11-05" + assert result.serverInfo.name == "test-server" + assert result.instructions == "Test instructions" + transport._stub.Initialize.assert_called_once() + + async def test_ping(self) -> None: + """Test ping call.""" + from mcp.client.grpc import GrpcClientTransport + from mcp.v1.mcp_pb2 import PingResponse + + transport = GrpcClientTransport("localhost:50051") + transport._stub = MagicMock() + transport._stub.Ping = AsyncMock(return_value=PingResponse()) + + await transport.send_ping() + transport._stub.Ping.assert_called_once() + + async def test_error_mapping(self) -> None: + """Test gRPC to MCP error mapping.""" + from mcp.client.grpc import GrpcClientTransport + + transport = GrpcClientTransport("localhost:50051") + + # Mock a gRPC error using a class that implements code() and details() + class MockRpcError(grpc.RpcError): + def code(self): + return grpc.StatusCode.NOT_FOUND + def details(self): + return "Not found" + + mock_error = MockRpcError() + + mapped_error = transport._map_error(mock_error) + assert isinstance(mapped_error, ValueError) + assert "Not found" in str(mapped_error) diff --git a/tests/client/test_list_roots_callback.py b/tests/client/test_list_roots_callback.py index 0da0fff07a..5acb3b21aa 100644 --- a/tests/client/test_list_roots_callback.py +++ b/tests/client/test_list_roots_callback.py @@ -1,7 +1,7 @@ import pytest from pydantic import FileUrl -from mcp.client.session import ClientSession +from mcp.client.transport_session import ClientTransportSession from mcp.server.fastmcp.server import Context from mcp.server.session import ServerSession from mcp.shared.context import RequestContext @@ -31,7 +31,7 @@ async def test_list_roots_callback(): ) async def list_roots_callback( - context: RequestContext[ClientSession, None], + context: RequestContext[ClientTransportSession, None], ) -> ListRootsResult: return callback_return diff --git a/tests/client/test_sampling_callback.py b/tests/client/test_sampling_callback.py index a3f6affda8..9fb6e29c75 100644 --- a/tests/client/test_sampling_callback.py +++ b/tests/client/test_sampling_callback.py @@ -1,6 +1,7 @@ import pytest -from mcp.client.session import ClientSession +from mcp.client.transport_session import ClientTransportSession +from mcp.server.session import ServerSession from mcp.shared.context import RequestContext from mcp.shared.memory import ( create_connected_server_and_client_session as create_session, @@ -27,14 +28,16 @@ async def test_sampling_callback(): ) async def sampling_callback( - context: RequestContext[ClientSession, None], + context: RequestContext[ClientTransportSession, None], params: CreateMessageRequestParams, ) -> CreateMessageResult: return callback_return @server.tool("test_sampling") async def test_sampling_tool(message: str): - value = await server.get_context().session.create_message( + session = server.get_context().session + assert isinstance(session, ServerSession) + value = await session.create_message( messages=[SamplingMessage(role="user", content=TextContent(type="text", text=message))], max_tokens=100, ) diff --git a/tests/client/test_session.py b/tests/client/test_session.py index 8d0ef68a98..bd51e4e102 100644 --- a/tests/client/test_session.py +++ b/tests/client/test_session.py @@ -5,6 +5,7 @@ import mcp.types as types from mcp.client.session import DEFAULT_CLIENT_INFO, ClientSession +from mcp.client.transport_session import ClientTransportSession from mcp.shared.context import RequestContext from mcp.shared.message import SessionMessage from mcp.shared.session import RequestResponder @@ -427,7 +428,7 @@ async def test_client_capabilities_with_custom_callbacks(): received_capabilities = None async def custom_sampling_callback( # pragma: no cover - context: RequestContext["ClientSession", Any], + context: RequestContext["ClientTransportSession", Any], params: types.CreateMessageRequestParams, ) -> types.CreateMessageResult | types.ErrorData: return types.CreateMessageResult( @@ -437,7 +438,7 @@ async def custom_sampling_callback( # pragma: no cover ) async def custom_list_roots_callback( # pragma: no cover - context: RequestContext["ClientSession", Any], + context: RequestContext["ClientTransportSession", Any], ) -> types.ListRootsResult | types.ErrorData: return types.ListRootsResult(roots=[]) diff --git a/tests/server/fastmcp/test_elicitation.py b/tests/server/fastmcp/test_elicitation.py index 2c74d0e88b..52e6799b7b 100644 --- a/tests/server/fastmcp/test_elicitation.py +++ b/tests/server/fastmcp/test_elicitation.py @@ -7,9 +7,10 @@ import pytest from pydantic import BaseModel, Field -from mcp.client.session import ClientSession, ElicitationFnT +from mcp.client.session import ElicitationFnT +from mcp.client.transport_session import ClientTransportSession from mcp.server.fastmcp import Context, FastMCP -from mcp.server.session import ServerSession +from mcp.server.transport_session import ServerTransportSession from mcp.shared.context import RequestContext from mcp.shared.memory import create_connected_server_and_client_session from mcp.types import ElicitRequestParams, ElicitResult, TextContent @@ -24,7 +25,7 @@ def create_ask_user_tool(mcp: FastMCP): """Create a standard ask_user tool that handles all elicitation responses.""" @mcp.tool(description="A tool that uses elicitation") - async def ask_user(prompt: str, ctx: Context[ServerSession, None]) -> str: + async def ask_user(prompt: str, ctx: Context[ServerTransportSession, None]) -> str: result = await ctx.elicit(message=f"Tool wants to ask: {prompt}", schema=AnswerSchema) if result.action == "accept" and result.data: @@ -72,7 +73,7 @@ async def test_stdio_elicitation(): # Create a custom handler for elicitation requests async def elicitation_callback( - context: RequestContext[ClientSession, None], params: ElicitRequestParams + context: RequestContext[ClientTransportSession, None], params: ElicitRequestParams ): # pragma: no cover if params.message == "Tool wants to ask: What is your name?": return ElicitResult(action="accept", content={"answer": "Test User"}) @@ -90,7 +91,7 @@ async def test_stdio_elicitation_decline(): mcp = FastMCP(name="StdioElicitationDeclineServer") create_ask_user_tool(mcp) - async def elicitation_callback(context: RequestContext[ClientSession, None], params: ElicitRequestParams): + async def elicitation_callback(context: RequestContext[ClientTransportSession, None], params: ElicitRequestParams): return ElicitResult(action="decline") await call_tool_and_assert( @@ -105,7 +106,7 @@ async def test_elicitation_schema_validation(): def create_validation_tool(name: str, schema_class: type[BaseModel]): @mcp.tool(name=name, description=f"Tool testing {name}") - async def tool(ctx: Context[ServerSession, None]) -> str: # pragma: no cover + async def tool(ctx: Context[ServerTransportSession, None]) -> str: # pragma: no cover try: await ctx.elicit(message="This should fail validation", schema=schema_class) return "Should not reach here" @@ -129,7 +130,7 @@ class InvalidNestedSchema(BaseModel): # Dummy callback (won't be called due to validation failure) async def elicitation_callback( - context: RequestContext[ClientSession, None], params: ElicitRequestParams + context: RequestContext[ClientTransportSession, None], params: ElicitRequestParams ): # pragma: no cover return ElicitResult(action="accept", content={}) @@ -159,7 +160,7 @@ class OptionalSchema(BaseModel): subscribe: bool | None = Field(default=False, description="Subscribe to newsletter?") @mcp.tool(description="Tool with optional fields") - async def optional_tool(ctx: Context[ServerSession, None]) -> str: + async def optional_tool(ctx: Context[ServerTransportSession, None]) -> str: result = await ctx.elicit(message="Please provide your information", schema=OptionalSchema) if result.action == "accept" and result.data: @@ -189,7 +190,7 @@ async def optional_tool(ctx: Context[ServerSession, None]) -> str: for content, expected in test_cases: - async def callback(context: RequestContext[ClientSession, None], params: ElicitRequestParams): + async def callback(context: RequestContext[ClientTransportSession, None], params: ElicitRequestParams): return ElicitResult(action="accept", content=content) await call_tool_and_assert(mcp, callback, "optional_tool", {}, expected) @@ -200,7 +201,7 @@ class InvalidOptionalSchema(BaseModel): optional_list: list[str] | None = Field(default=None, description="Invalid optional list") @mcp.tool(description="Tool with invalid optional field") - async def invalid_optional_tool(ctx: Context[ServerSession, None]) -> str: # pragma: no cover + async def invalid_optional_tool(ctx: Context[ServerTransportSession, None]) -> str: # pragma: no cover try: await ctx.elicit(message="This should fail", schema=InvalidOptionalSchema) return "Should not reach here" @@ -208,7 +209,7 @@ async def invalid_optional_tool(ctx: Context[ServerSession, None]) -> str: # pr return f"Validation failed: {str(e)}" async def elicitation_callback( - context: RequestContext[ClientSession, None], params: ElicitRequestParams + context: RequestContext[ClientTransportSession, None], params: ElicitRequestParams ): # pragma: no cover return ElicitResult(action="accept", content={}) @@ -233,7 +234,7 @@ class DefaultsSchema(BaseModel): email: str = Field(description="Email address (required)") @mcp.tool(description="Tool with default values") - async def defaults_tool(ctx: Context[ServerSession, None]) -> str: + async def defaults_tool(ctx: Context[ServerTransportSession, None]) -> str: result = await ctx.elicit(message="Please provide your information", schema=DefaultsSchema) if result.action == "accept" and result.data: @@ -245,7 +246,9 @@ async def defaults_tool(ctx: Context[ServerSession, None]) -> str: return f"User {result.action}" # First verify that defaults are present in the JSON schema sent to clients - async def callback_schema_verify(context: RequestContext[ClientSession, None], params: ElicitRequestParams): + async def callback_schema_verify( + context: RequestContext[ClientTransportSession, None], params: ElicitRequestParams + ): # Verify the schema includes defaults schema = params.requestedSchema props = schema["properties"] @@ -266,7 +269,7 @@ async def callback_schema_verify(context: RequestContext[ClientSession, None], p ) # Test overriding defaults - async def callback_override(context: RequestContext[ClientSession, None], params: ElicitRequestParams): + async def callback_override(context: RequestContext[ClientTransportSession, None], params: ElicitRequestParams): return ElicitResult( action="accept", content={"email": "john@example.com", "name": "John", "age": 25, "subscribe": False} ) diff --git a/tests/server/fastmcp/test_integration.py b/tests/server/fastmcp/test_integration.py index b1cefca29c..d95d3a380e 100644 --- a/tests/server/fastmcp/test_integration.py +++ b/tests/server/fastmcp/test_integration.py @@ -35,6 +35,7 @@ from mcp.client.session import ClientSession from mcp.client.sse import sse_client from mcp.client.streamable_http import GetSessionIdCallback, streamablehttp_client +from mcp.client.transport_session import ClientTransportSession from mcp.shared.context import RequestContext from mcp.shared.message import SessionMessage from mcp.shared.session import RequestResponder @@ -212,7 +213,7 @@ def unpack_streams( # Callback functions for testing async def sampling_callback( - context: RequestContext[ClientSession, None], params: CreateMessageRequestParams + context: RequestContext[ClientTransportSession, None], params: CreateMessageRequestParams ) -> CreateMessageResult: """Sampling callback for tests.""" return CreateMessageResult( @@ -225,7 +226,7 @@ async def sampling_callback( ) -async def elicitation_callback(context: RequestContext[ClientSession, None], params: ElicitRequestParams): +async def elicitation_callback(context: RequestContext[ClientTransportSession, None], params: ElicitRequestParams): """Elicitation callback for tests.""" # For restaurant booking test if "No tables available" in params.message: diff --git a/tests/server/grpc/__init__.py b/tests/server/grpc/__init__.py new file mode 100644 index 0000000000..972336a18e --- /dev/null +++ b/tests/server/grpc/__init__.py @@ -0,0 +1 @@ +# gRPC server tests \ No newline at end of file diff --git a/tests/server/grpc/test_server.py b/tests/server/grpc/test_server.py new file mode 100644 index 0000000000..0d39e27a81 --- /dev/null +++ b/tests/server/grpc/test_server.py @@ -0,0 +1,161 @@ + +import asyncio +import pytest +from pydantic import AnyUrl +from mcp.server.lowlevel.server import Server +from mcp.client.grpc import GrpcClientTransport +from mcp.server.grpc import start_grpc_server +import mcp.types as types +from mcp.server.lowlevel.helper_types import ReadResourceContents + +@pytest.mark.anyio +async def test_grpc_server_end_to_end(): + # 1. Setup Server + server = Server("test-grpc-server") + + @server.call_tool() + async def echo_tool(name: str, arguments: dict) -> list[types.TextContent]: + if name != "echo_tool": + raise ValueError(f"Unknown tool: {name}") + + # If progress is requested, send some notifications + ctx = server.request_context + if ctx.session: + await ctx.session.send_progress_notification( + progress_token=123, + progress=50.0, + total=100.0, + message="Halfway there" + ) + + return [types.TextContent(type="text", text=f"Echo: {arguments.get('message', '')}")] + + @server.list_tools() + async def list_tools() -> list[types.Tool]: + return [ + types.Tool( + name="echo_tool", + description="Echoes back", + inputSchema={"type": "object", "properties": {"message": {"type": "string"}}} + ) + ] + + @server.list_resources() + async def list_resources() -> list[types.Resource]: + return [ + types.Resource( + uri=AnyUrl("file:///test/resource.txt"), + name="test_resource", + mimeType="text/plain" + ) + ] + + @server.read_resource() + async def read_resource(uri: AnyUrl) -> list[ReadResourceContents]: + if str(uri) == "file:///test/resource.txt": + return [ + ReadResourceContents( + content="Resource Content", + mime_type="text/plain" + ) + ] + raise ValueError("Resource not found") + + @server.list_prompts() + async def list_prompts() -> list[types.Prompt]: + return [ + types.Prompt( + name="test_prompt", + description="A test prompt" + ) + ] + + @server.get_prompt() + async def get_prompt(name: str, arguments: dict | None) -> types.GetPromptResult: + if name == "test_prompt": + return types.GetPromptResult( + description="A test prompt", + messages=[ + types.PromptMessage( + role="user", + content=types.TextContent(type="text", text="Hello Prompt") + ) + ] + ) + raise ValueError("Prompt not found") + + # 2. Start gRPC Server + import socket + sock = socket.socket() + sock.bind(('localhost', 0)) + port = sock.getsockname()[1] + sock.close() + + address = f"localhost:{port}" + grpc_server = await start_grpc_server(server, address) + + try: + # 3. Connect Client + async with GrpcClientTransport(address) as client: + # Test Initialize + init_res = await client.initialize() + assert init_res.serverInfo.name == "test-grpc-server" + + # Test List Tools (Streaming) + tools_res = await client.list_tools() + assert len(tools_res.tools) == 1 + assert tools_res.tools[0].name == "echo_tool" + + # Test Call Tool + call_res = await client.call_tool("echo_tool", {"message": "Hello gRPC"}) + assert call_res.content[0].text == "Echo: Hello gRPC" + + # Test Call Tool with Progress + progress_updates = [] + async def progress_callback(progress, total, message): + progress_updates.append((progress, total, message)) + + call_res_progress = await client.call_tool( + "echo_tool", + {"message": "Hello Progress"}, + progress_callback=progress_callback + ) + assert call_res_progress.content[0].text == "Echo: Hello Progress" + assert len(progress_updates) == 1 + assert progress_updates[0] == (50.0, 100.0, "Halfway there") + + # Test Error (Tool not found) + # MCP returns error as result, not exception + error_res = await client.call_tool("non_existent_tool", {}) + assert error_res.isError is True + assert "Unknown tool" in error_res.content[0].text + + # Ensure connection is still healthy after an error + call_res = await client.call_tool("echo_tool", {"message": "Still here"}) + assert call_res.content[0].text == "Echo: Still here" + + # Test List Resources (Streaming) + res_list = await client.list_resources() + assert len(res_list.resources) == 1 + assert str(res_list.resources[0].uri) == "file:///test/resource.txt" + + # Test Read Resource + read_res = await client.read_resource(AnyUrl("file:///test/resource.txt")) + assert read_res.contents[0].text == "Resource Content" + + # Test Read Resource error + with pytest.raises(Exception) as excinfo: + await client.read_resource(AnyUrl("file:///test/non_existent.txt")) + assert "Resource not found" in str(excinfo.value) + + # Test List Prompts (Streaming) + prompts_list = await client.list_prompts() + assert len(prompts_list.prompts) == 1 + assert prompts_list.prompts[0].name == "test_prompt" + + # Test Get Prompt + prompt_res = await client.get_prompt("test_prompt") + assert prompt_res.messages[0].content.text == "Hello Prompt" + + finally: + await grpc_server.stop(0) diff --git a/tests/server/test_cancel_handling.py b/tests/server/test_cancel_handling.py index 47c49bb62b..b1f825933a 100644 --- a/tests/server/test_cancel_handling.py +++ b/tests/server/test_cancel_handling.py @@ -6,6 +6,7 @@ import pytest import mcp.types as types +from mcp.client.session import ClientSession from mcp.server.lowlevel.server import Server from mcp.shared.exceptions import McpError from mcp.shared.memory import create_connected_server_and_client_session @@ -56,6 +57,8 @@ async def handle_call_tool(name: str, arguments: dict[str, Any] | None) -> list[ async with create_connected_server_and_client_session(server) as client: # First request (will be cancelled) + assert isinstance(client, ClientSession) + async def first_request(): try: await client.send_request( diff --git a/tests/shared/test_memory.py b/tests/shared/test_memory.py index ca4368e9f8..56e0b98e70 100644 --- a/tests/shared/test_memory.py +++ b/tests/shared/test_memory.py @@ -3,6 +3,7 @@ from typing_extensions import AsyncGenerator from mcp.client.session import ClientSession +from mcp.client.transport_session import ClientTransportSession from mcp.server import Server from mcp.shared.memory import create_connected_server_and_client_session from mcp.types import EmptyResult, Resource @@ -28,7 +29,7 @@ async def handle_list_resources(): # pragma: no cover @pytest.fixture async def client_connected_to_server( mcp_server: Server, -) -> AsyncGenerator[ClientSession, None]: +) -> AsyncGenerator[ClientTransportSession, None]: async with create_connected_server_and_client_session(mcp_server) as client_session: yield client_session diff --git a/tests/shared/test_progress_notifications.py b/tests/shared/test_progress_notifications.py index 1552711d2e..25afd7f328 100644 --- a/tests/shared/test_progress_notifications.py +++ b/tests/shared/test_progress_notifications.py @@ -370,6 +370,7 @@ async def handle_list_tools() -> list[types.Tool]: with patch("mcp.shared.session.logging.error", side_effect=mock_log_error): async with create_connected_server_and_client_session(server) as client_session: # Send a request with a failing progress callback + assert isinstance(client_session, ClientSession) result = await client_session.send_request( types.ClientRequest( types.CallToolRequest( diff --git a/tests/shared/test_session.py b/tests/shared/test_session.py index 313ec99265..a056f705ba 100644 --- a/tests/shared/test_session.py +++ b/tests/shared/test_session.py @@ -6,6 +6,7 @@ import mcp.types as types from mcp.client.session import ClientSession +from mcp.client.transport_session import ClientTransportSession from mcp.server.lowlevel.server import Server from mcp.shared.exceptions import McpError from mcp.shared.memory import create_client_server_memory_streams, create_connected_server_and_client_session @@ -27,19 +28,20 @@ def mcp_server() -> Server: @pytest.fixture async def client_connected_to_server( mcp_server: Server, -) -> AsyncGenerator[ClientSession, None]: +) -> AsyncGenerator[ClientTransportSession, None]: async with create_connected_server_and_client_session(mcp_server) as client_session: yield client_session @pytest.mark.anyio async def test_in_flight_requests_cleared_after_completion( - client_connected_to_server: ClientSession, + client_connected_to_server: ClientTransportSession, ): """Verify that _in_flight is empty after all requests complete.""" # Send a request and wait for response response = await client_connected_to_server.send_ping() assert isinstance(response, EmptyResult) + assert isinstance(client_connected_to_server, ClientSession) # Verify _in_flight is empty assert len(client_connected_to_server._in_flight) == 0 @@ -101,6 +103,7 @@ async def make_request(client_session: ClientSession): async with create_connected_server_and_client_session(make_server()) as client_session: async with anyio.create_task_group() as tg: + assert isinstance(client_session, ClientSession) tg.start_soon(make_request, client_session) # Wait for the request to be in-flight diff --git a/tests/shared/test_sse.py b/tests/shared/test_sse.py index 28ac07d092..0f850599a3 100644 --- a/tests/shared/test_sse.py +++ b/tests/shared/test_sse.py @@ -19,6 +19,7 @@ import mcp.types as types from mcp.client.session import ClientSession from mcp.client.sse import sse_client +from mcp.client.transport_session import ClientTransportSession from mcp.server import Server from mcp.server.sse import SseServerTransport from mcp.server.transport_security import TransportSecuritySettings @@ -185,7 +186,7 @@ async def test_sse_client_basic_connection(server: None, server_url: str) -> Non @pytest.fixture -async def initialized_sse_client_session(server: None, server_url: str) -> AsyncGenerator[ClientSession, None]: +async def initialized_sse_client_session(server: None, server_url: str) -> AsyncGenerator[ClientTransportSession, None]: async with sse_client(server_url + "/sse", sse_read_timeout=0.5) as streams: async with ClientSession(*streams) as session: await session.initialize() diff --git a/tests/shared/test_streamable_http.py b/tests/shared/test_streamable_http.py index 43b321d96e..be80e38201 100644 --- a/tests/shared/test_streamable_http.py +++ b/tests/shared/test_streamable_http.py @@ -23,7 +23,9 @@ import mcp.types as types from mcp.client.session import ClientSession from mcp.client.streamable_http import streamablehttp_client +from mcp.client.transport_session import ClientTransportSession from mcp.server import Server +from mcp.server.session import ServerSession from mcp.server.streamable_http import ( MCP_PROTOCOL_VERSION_HEADER, MCP_SESSION_ID_HEADER, @@ -198,7 +200,9 @@ async def handle_call_tool(name: str, args: dict[str, Any]) -> list[TextContent] elif name == "test_sampling_tool": # Test sampling by requesting the client to sample a message - sampling_result = await ctx.session.create_message( + session = ctx.session + assert isinstance(session, ServerSession) + sampling_result = await session.create_message( messages=[ types.SamplingMessage( role="user", @@ -1233,7 +1237,7 @@ async def test_streamablehttp_server_sampling(basic_server: None, basic_server_u # Define sampling callback that returns a mock response async def sampling_callback( - context: RequestContext[ClientSession, Any], + context: RequestContext[ClientTransportSession, Any], params: types.CreateMessageRequestParams, ) -> types.CreateMessageResult: nonlocal sampling_callback_invoked, captured_message_params diff --git a/tests/shared/test_ws.py b/tests/shared/test_ws.py index f093cb4927..107cd5589e 100644 --- a/tests/shared/test_ws.py +++ b/tests/shared/test_ws.py @@ -13,6 +13,7 @@ from 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