├── .github
    └── workflows
    │   ├── ci.yml
    │   └── release.yml
├── .gitignore
├── CHANGELOG.md
├── Cargo.lock
├── Cargo.toml
├── README.md
├── examples
    ├── echo.rs
    └── echo_streamable.rs
├── src
    ├── cli.rs
    ├── core.rs
    ├── main.rs
    └── state.rs
└── tests
    ├── advanced_test.rs
    ├── basic_test.rs
    └── echo
        └── mod.rs


/.github/workflows/ci.yml:
--------------------------------------------------------------------------------
 1 | name: Rust
 2 | 
 3 | on:
 4 |   push:
 5 |     branches: [ "main" ]
 6 |   pull_request:
 7 |     branches: [ "main" ]
 8 | 
 9 | env:
10 |   CARGO_TERM_COLOR: always
11 | 
12 | jobs:
13 |   build:
14 | 
15 |     runs-on: ubuntu-latest
16 | 
17 |     steps:
18 |     - uses: actions/checkout@v4
19 |     - name: Build
20 |       run: cargo build --verbose
21 |     - name: Build examples
22 |       run: cargo build --examples
23 |     - name: Run tests
24 |       run: cargo test --verbose
25 | 


--------------------------------------------------------------------------------
/.github/workflows/release.yml:
--------------------------------------------------------------------------------
 1 | name: Rust Release
 2 | 
 3 | on:
 4 |   push:
 5 |     branches:
 6 |       # Always run on main branch.
 7 |       - main
 8 |     tags:
 9 |       - '*'
10 |   workflow_dispatch:
11 | 
12 | 
13 | jobs:
14 |   release:
15 |     name: ${{ matrix.platform.os-name }}
16 |     permissions:
17 |       contents: write
18 |     strategy:
19 |       fail-fast: false
20 |       matrix:
21 |         platform:
22 |           - os-name: FreeBSD-x86_64
23 |             runs-on: ubuntu-24.04
24 |             target: x86_64-unknown-freebsd
25 | 
26 |           - os-name: Linux-x86_64
27 |             runs-on: ubuntu-24.04
28 |             target: x86_64-unknown-linux-gnu
29 | 
30 |           - os-name: Linux-aarch64
31 |             runs-on: ubuntu-24.04
32 |             target: aarch64-unknown-linux-gnu
33 | 
34 |           - os-name: Linux-x86_64-musl
35 |             runs-on: ubuntu-24.04
36 |             target: x86_64-unknown-linux-musl
37 | 
38 |           - os-name: Linux-aarch64-musl
39 |             runs-on: ubuntu-24.04
40 |             target: aarch64-unknown-linux-musl
41 | 
42 |           - os-name: Windows-x86_64
43 |             runs-on: windows-latest
44 |             target: x86_64-pc-windows-msvc
45 | 
46 |           - os-name: macOS-x86_64
47 |             runs-on: macOS-latest
48 |             target: x86_64-apple-darwin
49 | 
50 |           - os-name: macOS-arm64
51 |             runs-on: macos-latest
52 |             target: aarch64-apple-darwin
53 | 
54 |     runs-on: ${{ matrix.platform.runs-on }}
55 |     steps:
56 |       - name: Checkout
57 |         uses: actions/checkout@v4
58 |       - name: Build binary
59 |         uses: houseabsolute/actions-rust-cross@f7da4010930154943c99d13df0151dece91a924f
60 |         with:
61 |           command: build
62 |           target: ${{ matrix.platform.target }}
63 |           args: "--locked --release"
64 |           strip: true
65 |       - name: Create archive (Unix)
66 |         if: matrix.platform.os-name != 'Windows-x86_64'
67 |         run: tar -czvf mcp-proxy-${{ matrix.platform.target }}.tar.gz -C target/*/release mcp-proxy
68 |       - name: Create archive (Windows)
69 |         if: matrix.platform.os-name == 'Windows-x86_64'
70 |         working-directory: target\\${{ matrix.platform.target }}\\release
71 |         run: 7z a ..\\..\\..\\mcp-proxy-${{ matrix.platform.target }}.zip mcp-proxy.exe
72 |       - name: Upload artifacts
73 |         uses: actions/upload-artifact@v4
74 |         with:
75 |           name: mcp-proxy-${{ matrix.platform.target }}
76 |           path: mcp-proxy-${{ matrix.platform.target }}.*
77 |       - name: Release
78 |         uses: softprops/action-gh-release@39ba0b9d81217c984acfad95ddcc7db226387497
79 |         if: github.ref_type == 'tag'
80 |         with:
81 |           files: 'mcp-proxy-${{ matrix.platform.target }}.*'
82 | 


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
1 | /target
2 | 


--------------------------------------------------------------------------------
/CHANGELOG.md:
--------------------------------------------------------------------------------
 1 | # Changelog
 2 | 
 3 | ## 0.2.0 (2025-05-20)
 4 | 
 5 | * Enhancements
 6 |   * support streamable HTTP transport: the proxy tries to automatically detect the correct transport to use
 7 | * Bug fixes
 8 |   * fix `annotations` field being sent as `null` causing issues in Cursor (upstream bug in the SDK)
 9 | 
10 | ## 0.1.1 (2025-05-02)
11 | 
12 | * Refactor code to use the [Rust MCP SDK](https://github.com/modelcontextprotocol/rust-sdk).
13 | 
14 | ## 0.1.0 (2025-04-29)
15 | 
16 | Initial release.
17 | 


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2530 | dependencies = [
2531 |  "zerofrom-derive",
2532 | ]
2533 | 
2534 | [[package]]
2535 | name = "zerofrom-derive"
2536 | version = "0.1.6"
2537 | source = "registry+https://github.com/rust-lang/crates.io-index"
2538 | checksum = "d71e5d6e06ab090c67b5e44993ec16b72dcbaabc526db883a360057678b48502"
2539 | dependencies = [
2540 |  "proc-macro2",
2541 |  "quote",
2542 |  "syn",
2543 |  "synstructure",
2544 | ]
2545 | 
2546 | [[package]]
2547 | name = "zeroize"
2548 | version = "1.8.1"
2549 | source = "registry+https://github.com/rust-lang/crates.io-index"
2550 | checksum = "ced3678a2879b30306d323f4542626697a464a97c0a07c9aebf7ebca65cd4dde"
2551 | 
2552 | [[package]]
2553 | name = "zerovec"
2554 | version = "0.10.4"
2555 | source = "registry+https://github.com/rust-lang/crates.io-index"
2556 | checksum = "aa2b893d79df23bfb12d5461018d408ea19dfafe76c2c7ef6d4eba614f8ff079"
2557 | dependencies = [
2558 |  "yoke",
2559 |  "zerofrom",
2560 |  "zerovec-derive",
2561 | ]
2562 | 
2563 | [[package]]
2564 | name = "zerovec-derive"
2565 | version = "0.10.3"
2566 | source = "registry+https://github.com/rust-lang/crates.io-index"
2567 | checksum = "6eafa6dfb17584ea3e2bd6e76e0cc15ad7af12b09abdd1ca55961bed9b1063c6"
2568 | dependencies = [
2569 |  "proc-macro2",
2570 |  "quote",
2571 |  "syn",
2572 | ]
2573 | 


--------------------------------------------------------------------------------
/Cargo.toml:
--------------------------------------------------------------------------------
 1 | [package]
 2 | name = "mcp-proxy"
 3 | version = "0.2.0"
 4 | edition = "2024"
 5 | 
 6 | [dependencies]
 7 | rmcp = { git = "https://github.com/modelcontextprotocol/rust-sdk.git", rev = "076dc2c2cd8910bee56bae13f29bbcff8c279666", features = [
 8 |     "server",
 9 |     "client",
10 |     "reqwest",
11 |     "client-side-sse",
12 |     "transport-sse-client",
13 |     "transport-streamable-http-client",
14 |     "transport-worker",
15 |     "transport-child-process"
16 | ] }
17 | clap = { version = "4.5.37", features = ["derive"] }
18 | tokio = { version = "1", features = ["full"] }
19 | tracing = "0.1.41"
20 | tracing-subscriber = "0.3.19"
21 | anyhow = "1.0.98"
22 | uuid = { version = "1.6", features = ["v7", "fast-rng"] }
23 | futures = "0.3.31"
24 | tokio-util = "0.7.15"
25 | reqwest = { version = "0.12", features = ["json", "stream"] }
26 | 
27 | [dependencies.openssl-sys]
28 | version = "0.9"
29 | features = ["vendored"]
30 | 
31 | [dev-dependencies]
32 | rmcp = { git = "https://github.com/modelcontextprotocol/rust-sdk.git", rev = "076dc2c2cd8910bee56bae13f29bbcff8c279666", features = [
33 |     "server",
34 |     "client",
35 |     "reqwest",
36 |     "client-side-sse",
37 |     "transport-sse-client",
38 |     "transport-sse-server",
39 |     "transport-child-process",
40 |     "transport-streamable-http-server",
41 |     "macros"
42 | ] }
43 | axum = { version = "0.8", features = ["macros"] }
44 | serde = { version = "1.0", features = ["derive"] }
45 | serde_json = "1.0"
46 | 
47 | [profile.release]
48 | opt-level = "s"
49 | lto = true
50 | codegen-units = 1
51 | strip = true
52 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
  1 | # mcp-proxy
  2 | 
  3 | A standalone binary for connecting STDIO based MCP clients to HTTP (SSE) based MCP servers.
  4 | 
  5 | Note: the proxy supports both SSE according to the `2024-11-05` as well as streamable HTTP according to the `2025-03-26` specification.
  6 | It may happen though that the connecting client does **not** support the version sent by the server.
  7 | 
  8 | ## Installation
  9 | 
 10 | The latest releases are available on the [releases page](https://github.com/tidewave-ai/mcp_proxy_rust/releases).
 11 | 
 12 | ### macOS
 13 | 
 14 | Depending on your Mac, you can download the latest version with one of the following commands:
 15 | 
 16 | Apple Silicon:
 17 | 
 18 | ```bash
 19 | curl -sL https://github.com/tidewave-ai/mcp_proxy_rust/releases/latest/download/mcp-proxy-aarch64-apple-darwin.tar.gz | tar xv
 20 | ```
 21 | 
 22 | Intel:
 23 | 
 24 | ```bash
 25 | curl -sL https://github.com/tidewave-ai/mcp_proxy_rust/releases/latest/download/mcp-proxy-x86_64-apple-darwin.tar.gz | tar xv
 26 | ```
 27 | 
 28 | which will put the `mcp-proxy` binary in the current working directory (`pwd`).
 29 | 
 30 | Note that the binaries are not notarized, so if you download the release with the browser, you won't be able to open it.
 31 | 
 32 | Alternatively, you can remove the quarantine flag with:
 33 | 
 34 | ```bash
 35 | xattr -d com.apple.quarantine /path/to/mcp-proxy
 36 | ```
 37 | 
 38 | ### Linux
 39 | 
 40 | You can download the latest release from the [Releases page](https://github.com/tidewave-ai/mcp_proxy_rust/releases) or with one command, depending on your architecture:
 41 | 
 42 | x86:
 43 | 
 44 | ```bash
 45 | curl -sL https://github.com/tidewave-ai/mcp_proxy_rust/releases/latest/download/mcp-proxy-x86_64-unknown-linux-musl.tar.gz | tar zxv
 46 | ```
 47 | 
 48 | arm64 / aarch64:
 49 | 
 50 | ```bash
 51 | curl -sL https://github.com/tidewave-ai/mcp_proxy_rust/releases/latest/download/mcp-proxy-aarch64-unknown-linux-musl.tar.gz | tar zxv
 52 | ```
 53 | 
 54 | ### Windows
 55 | 
 56 | You can download the latest release from the [Releases page](https://github.com/tidewave-ai/mcp_proxy_rust/releases) or with the following Powershell command:
 57 | 
 58 | ```powershell
 59 | curl.exe -L -o mcp-proxy.zip https://github.com/tidewave-ai/mcp_proxy_rust/releases/latest/download/mcp-proxy-x86_64-pc-windows-msvc.zip; Expand-Archive -Path mcp-proxy.zip -DestinationPath .
 60 | ```
 61 | 
 62 | ## Building from scratch
 63 | 
 64 | The proxy is built in Rust. If you have Rust and its tools installed, the project can be built with `cargo`:
 65 | 
 66 | ```bash
 67 | cargo build --release
 68 | ```
 69 | 
 70 | Then, the binary will be located at `target/release/mcp-proxy`.
 71 | 
 72 | ## Usage
 73 | 
 74 | If you have an SSE MCP server available at `http://localhost:4000/tidewave/mcp`, a client like Claude Desktop would then be configured as follows.
 75 | 
 76 | ### On macos/Linux
 77 | 
 78 | ```json
 79 | {
 80 |   "mcpServers": {
 81 |     "my-server": {
 82 |       "command": "/path/to/mcp-proxy",
 83 |       "args": ["http://localhost:4000/tidewave/mcp"]
 84 |     }
 85 |   }
 86 | }
 87 | ```
 88 | 
 89 | ### On Windows
 90 | 
 91 | ```json
 92 | {
 93 |   "mcpServers": {
 94 |     "my-server": {
 95 |       "command": "c:\\path\\to\\mcp-proxy.exe",
 96 |       "args": ["http://localhost:4000/tidewave/mcp"]
 97 |     }
 98 |   }
 99 | }
100 | ```
101 | 
102 | ## Configuration
103 | 
104 | `mcp-proxy` either accepts the SSE URL as argument or using the environment variable `SSE_URL`. For debugging purposes, you can also pass `--debug`, which will log debug messages on stderr.
105 | 
106 | Other supported flags:
107 | 
108 | * `--max-disconnected-time` the maximum amount of time for trying to reconnect while disconnected. When not set, defaults to infinity.
109 | 


--------------------------------------------------------------------------------
/examples/echo.rs:
--------------------------------------------------------------------------------
 1 | use anyhow::Context;
 2 | use clap::Parser;
 3 | use rmcp::transport::SseServer;
 4 | use tracing_subscriber::FmtSubscriber;
 5 | 
 6 | use rmcp::{
 7 |     ServerHandler,
 8 |     model::{ServerCapabilities, ServerInfo},
 9 |     schemars, tool,
10 | };
11 | #[derive(Debug, Clone, Default)]
12 | pub struct Echo;
13 | #[tool(tool_box)]
14 | impl Echo {
15 |     #[tool(description = "Echo a message")]
16 |     fn echo(&self, #[tool(param)] message: String) -> String {
17 |         message
18 |     }
19 | }
20 | 
21 | #[tool(tool_box)]
22 | impl ServerHandler for Echo {
23 |     fn get_info(&self) -> ServerInfo {
24 |         ServerInfo {
25 |             instructions: Some("A simple echo server".into()),
26 |             capabilities: ServerCapabilities::builder().enable_tools().build(),
27 |             ..Default::default()
28 |         }
29 |     }
30 | }
31 | 
32 | #[derive(Parser)]
33 | #[command(author, version, about, long_about = None)]
34 | struct Args {
35 |     /// Address to bind the server to
36 |     #[arg(short, long, default_value = "127.0.0.1:8080")]
37 |     address: std::net::SocketAddr,
38 | }
39 | 
40 | #[tokio::main]
41 | async fn main() -> anyhow::Result<()> {
42 |     let subscriber = FmtSubscriber::builder()
43 |         .with_max_level(tracing::Level::DEBUG)
44 |         .with_writer(std::io::stderr)
45 |         .finish();
46 | 
47 |     // Parse command line arguments
48 |     let args = Args::parse();
49 | 
50 |     tracing::subscriber::set_global_default(subscriber).context("Failed to set up logging")?;
51 | 
52 |     let ct = SseServer::serve(args.address)
53 |         .await?
54 |         .with_service(Echo::default);
55 | 
56 |     tokio::signal::ctrl_c().await?;
57 |     ct.cancel();
58 |     Ok(())
59 | }
60 | 


--------------------------------------------------------------------------------
/examples/echo_streamable.rs:
--------------------------------------------------------------------------------
 1 | use anyhow::Context;
 2 | use clap::Parser;
 3 | use rmcp::transport::StreamableHttpServer;
 4 | use tracing_subscriber::FmtSubscriber;
 5 | 
 6 | use rmcp::{
 7 |     ServerHandler,
 8 |     model::{ServerCapabilities, ServerInfo},
 9 |     schemars, tool,
10 | };
11 | #[derive(Debug, Clone, Default)]
12 | pub struct Echo;
13 | #[tool(tool_box)]
14 | impl Echo {
15 |     #[tool(description = "Echo a message")]
16 |     fn echo(&self, #[tool(param)] message: String) -> String {
17 |         message
18 |     }
19 | }
20 | 
21 | #[tool(tool_box)]
22 | impl ServerHandler for Echo {
23 |     fn get_info(&self) -> ServerInfo {
24 |         ServerInfo {
25 |             instructions: Some("A simple echo server".into()),
26 |             capabilities: ServerCapabilities::builder().enable_tools().build(),
27 |             ..Default::default()
28 |         }
29 |     }
30 | }
31 | 
32 | #[derive(Parser)]
33 | #[command(author, version, about, long_about = None)]
34 | struct Args {
35 |     /// Address to bind the server to
36 |     #[arg(short, long, default_value = "127.0.0.1:8080")]
37 |     address: std::net::SocketAddr,
38 | }
39 | 
40 | #[tokio::main]
41 | async fn main() -> anyhow::Result<()> {
42 |     let subscriber = FmtSubscriber::builder()
43 |         .with_max_level(tracing::Level::DEBUG)
44 |         .with_writer(std::io::stderr)
45 |         .finish();
46 | 
47 |     // Parse command line arguments
48 |     let args = Args::parse();
49 | 
50 |     tracing::subscriber::set_global_default(subscriber).context("Failed to set up logging")?;
51 | 
52 |     let ct = StreamableHttpServer::serve(args.address)
53 |         .await?
54 |         .with_service(Echo::default);
55 | 
56 |     tokio::signal::ctrl_c().await?;
57 |     ct.cancel();
58 |     Ok(())
59 | }
60 | 


--------------------------------------------------------------------------------
/src/cli.rs:
--------------------------------------------------------------------------------
 1 | use clap::Parser;
 2 | 
 3 | #[derive(Parser, Debug)]
 4 | #[command(author, version, about, long_about = None)]
 5 | pub struct Args {
 6 |     /// The URL of the SSE endpoint to connect to
 7 |     #[arg(value_name = "URL")]
 8 |     pub sse_url: Option<String>,
 9 | 
10 |     /// Enable debug logging
11 |     #[arg(long)]
12 |     pub debug: bool,
13 | 
14 |     /// Maximum time to try reconnecting in seconds
15 |     #[arg(long)]
16 |     pub max_disconnected_time: Option<u64>,
17 | 
18 |     /// Initial retry interval in seconds. Default is 5 seconds
19 |     #[arg(long, default_value = "5")]
20 |     pub initial_retry_interval: u64,
21 | }
22 | 


--------------------------------------------------------------------------------
/src/core.rs:
--------------------------------------------------------------------------------
  1 | use crate::state::{AppState, BufferMode, ProxyState, ReconnectFailureReason};
  2 | use crate::{DISCONNECTED_ERROR_CODE, SseClientType, StdoutSink, TRANSPORT_SEND_ERROR_CODE};
  3 | use anyhow::{Result, anyhow};
  4 | use futures::FutureExt;
  5 | use futures::SinkExt;
  6 | use rmcp::model::{
  7 |     ClientJsonRpcMessage, ClientNotification, ClientRequest, ErrorData, RequestId,
  8 |     ServerJsonRpcMessage,
  9 | };
 10 | use std::time::Duration;
 11 | use tracing::{debug, error, info};
 12 | use uuid::Uuid;
 13 | 
 14 | /// Generates a random UUID for request IDs
 15 | pub(crate) fn generate_id() -> String {
 16 |     Uuid::now_v7().to_string()
 17 | }
 18 | 
 19 | /// Sends a disconnected error response
 20 | pub(crate) async fn reply_disconnected(id: &RequestId, stdout_sink: &mut StdoutSink) -> Result<()> {
 21 |     let error_response = ServerJsonRpcMessage::error(
 22 |         ErrorData::new(
 23 |             DISCONNECTED_ERROR_CODE,
 24 |             "Server not connected. The SSE endpoint is currently not available. Please ensure it is running and retry.".to_string(),
 25 |             None,
 26 |         ),
 27 |         id.clone(),
 28 |     );
 29 | 
 30 |     if let Err(e) = stdout_sink.send(error_response).await {
 31 |         error!("Error writing disconnected error response to stdout: {}", e);
 32 |     }
 33 | 
 34 |     Ok(())
 35 | }
 36 | 
 37 | pub(crate) async fn connect(app_state: &AppState) -> Result<SseClientType> {
 38 |     // this function should try sending a POST request to the sse_url and see if
 39 |     // the server responds with 405 method not supported. If so, it should call
 40 |     // connect_with_sse, otherwise it should call connect_with_streamable.
 41 |     let result = reqwest::Client::new()
 42 |         .post(app_state.url.clone())
 43 |         .header("Accept", "application/json,text/event-stream")
 44 |         .header("Content-Type", "application/json")
 45 |         .body(r#"{"jsonrpc":"2.0","id":"init","method":"initialize","params":{"protocolVersion":"2025-03-26","capabilities":{},"clientInfo":{"name":"test","version":"0.1.0"}}}"#)
 46 |         .send()
 47 |         .await?;
 48 | 
 49 |     if result.status() == reqwest::StatusCode::METHOD_NOT_ALLOWED {
 50 |         debug!("Server responded with 405, using SSE transport");
 51 |         return connect_with_sse(app_state).await;
 52 |     } else if result.status().is_success() {
 53 |         debug!("Server responded successfully, using streamable transport");
 54 |         return connect_with_streamable(app_state).await;
 55 |     } else {
 56 |         error!("Server returned unexpected status: {}", result.status());
 57 |         anyhow::bail!("Server returned unexpected status: {}", result.status());
 58 |     }
 59 | }
 60 | 
 61 | pub(crate) async fn connect_with_streamable(app_state: &AppState) -> Result<SseClientType> {
 62 |     let result = rmcp::transport::StreamableHttpClientTransport::with_client(
 63 |         reqwest::Client::default(),
 64 |         rmcp::transport::streamable_http_client::StreamableHttpClientTransportConfig {
 65 |             uri: app_state.url.clone().into(),
 66 |             // we don't want the sdk to perform any retries
 67 |             retry_config: std::sync::Arc::new(
 68 |                 rmcp::transport::common::client_side_sse::FixedInterval {
 69 |                     max_times: Some(0),
 70 |                     duration: Duration::from_millis(0),
 71 |                 },
 72 |             ),
 73 |             channel_buffer_capacity: 16,
 74 |         },
 75 |     );
 76 | 
 77 |     Ok(SseClientType::Streamable(result))
 78 | }
 79 | 
 80 | pub(crate) async fn connect_with_sse(app_state: &AppState) -> Result<SseClientType> {
 81 |     let result = rmcp::transport::SseClientTransport::start_with_client(
 82 |         reqwest::Client::default(),
 83 |         rmcp::transport::sse_client::SseClientConfig {
 84 |             sse_endpoint: app_state.url.clone().into(),
 85 |             // we don't want the sdk to perform any retries
 86 |             retry_policy: std::sync::Arc::new(
 87 |                 rmcp::transport::common::client_side_sse::FixedInterval {
 88 |                     max_times: Some(0),
 89 |                     duration: Duration::from_millis(0),
 90 |                 },
 91 |             ),
 92 |             use_message_endpoint: None,
 93 |         },
 94 |     )
 95 |     .await;
 96 | 
 97 |     match result {
 98 |         Ok(transport) => {
 99 |             info!("Successfully reconnected to SSE server");
100 |             Ok(SseClientType::Sse(transport))
101 |         }
102 |         Err(e) => {
103 |             error!("Failed to reconnect: {}", e);
104 |             Err(anyhow!("Connection failed: {}", e))
105 |         }
106 |     }
107 | }
108 | 
109 | /// Attempts to reconnect to the SSE server with backoff.
110 | /// Does not mutate AppState directly.
111 | pub(crate) async fn try_reconnect(
112 |     app_state: &AppState,
113 | ) -> Result<SseClientType, ReconnectFailureReason> {
114 |     let backoff = app_state.get_backoff_duration();
115 |     info!(
116 |         "Attempting to reconnect in {}s (attempt {})",
117 |         backoff.as_secs(),
118 |         app_state.connect_tries
119 |     );
120 | 
121 |     if app_state.disconnected_too_long() {
122 |         error!("Reconnect timeout exceeded, giving up reconnection attempts");
123 |         return Err(ReconnectFailureReason::TimeoutExceeded);
124 |     }
125 | 
126 |     let result = connect(app_state).await;
127 | 
128 |     match result {
129 |         Ok(transport) => {
130 |             info!("Successfully reconnected to SSE server");
131 |             Ok(transport)
132 |         }
133 |         Err(e) => {
134 |             error!("Failed to reconnect: {}", e);
135 |             Err(ReconnectFailureReason::ConnectionFailed(e))
136 |         }
137 |     }
138 | }
139 | 
140 | /// Sends a JSON-RPC request to the SSE server and handles any transport errors.
141 | /// Returns true if the send was successful, false otherwise.
142 | pub(crate) async fn send_request_to_sse(
143 |     transport: &mut SseClientType,
144 |     request: ClientJsonRpcMessage,
145 |     original_message: ClientJsonRpcMessage,
146 |     stdout_sink: &mut StdoutSink,
147 |     app_state: &mut AppState,
148 | ) -> Result<bool> {
149 |     debug!("Sending request to SSE: {:?}", request);
150 |     match transport.send(request.clone()).await {
151 |         Ok(_) => Ok(true),
152 |         Err(e) => {
153 |             error!("Error sending to SSE: {}", e);
154 |             app_state.handle_fatal_transport_error();
155 |             app_state
156 |                 .maybe_handle_message_while_disconnected(original_message, stdout_sink)
157 |                 .await?;
158 | 
159 |             Ok(false)
160 |         }
161 |     }
162 | }
163 | 
164 | /// Processes a client request message, handles ID mapping, sends it to the SSE server,
165 | /// and handles any transport errors.
166 | pub(crate) async fn process_client_request(
167 |     message: ClientJsonRpcMessage,
168 |     app_state: &mut AppState,
169 |     transport: &mut SseClientType,
170 |     stdout_sink: &mut StdoutSink,
171 | ) -> Result<()> {
172 |     // Try mapping the ID first (for Response/Error cases).
173 |     // If it returns None, the ID was unknown, so we skip processing/forwarding.
174 |     let message = match app_state.map_client_response_error_id(message) {
175 |         Some(msg) => msg,
176 |         None => return Ok(()), // Skip forwarding if ID was not mapped
177 |     };
178 | 
179 |     // Handle ping directly if disconnected
180 |     match app_state
181 |         .maybe_handle_message_while_disconnected(message.clone(), stdout_sink)
182 |         .await
183 |     {
184 |         Err(_) => {}
185 |         Ok(_) => return Ok(()),
186 |     }
187 | 
188 |     match &message {
189 |         ClientJsonRpcMessage::Request(req) => {
190 |             if app_state.init_message.is_none() {
191 |                 if let ClientRequest::InitializeRequest(_) = req.request {
192 |                     debug!("Stored client initialization message");
193 |                     app_state.init_message = Some(message.clone());
194 |                     app_state.state = ProxyState::WaitingForServerInit(req.id.clone());
195 |                 }
196 |             }
197 |         }
198 |         ClientJsonRpcMessage::Notification(notification) => {
199 |             if let ClientNotification::InitializedNotification(_) = notification.notification {
200 |                 if app_state.state == ProxyState::WaitingForClientInitialized {
201 |                     debug!("Received client initialized notification, proxy fully connected.");
202 |                     app_state.connected();
203 |                 } else {
204 |                     debug!("Forwarding client initialized notification outside of expected state.");
205 |                 }
206 |             }
207 |         }
208 |         _ => {}
209 |     }
210 | 
211 |     // Process requests separately to map their IDs before sending
212 |     let original_message = message.clone();
213 |     if let ClientJsonRpcMessage::Request(req) = message {
214 |         let request_id = req.id.clone();
215 |         let mut req = req.clone();
216 |         debug!("Forwarding request from stdin to SSE: {:?}", req);
217 | 
218 |         let new_id = generate_id();
219 |         let new_request_id = RequestId::String(new_id.clone().into());
220 |         req.id = new_request_id;
221 |         app_state.id_map.insert(new_id, request_id.clone());
222 | 
223 |         let _success = send_request_to_sse(
224 |             transport,
225 |             ClientJsonRpcMessage::Request(req),
226 |             original_message,
227 |             stdout_sink,
228 |             app_state,
229 |         )
230 |         .await?;
231 |         return Ok(());
232 |     }
233 | 
234 |     // Send other message types (Notifications, mapped Responses/Errors)
235 |     debug!("Forwarding message from stdin to SSE: {:?}", message);
236 |     if let Err(e) = transport.send(message).await {
237 |         error!("Error sending message to SSE: {}", e);
238 |         app_state.handle_fatal_transport_error();
239 |     }
240 | 
241 |     Ok(())
242 | }
243 | 
244 | /// Process buffered messages after a successful reconnection
245 | pub(crate) async fn process_buffered_messages(
246 |     app_state: &mut AppState,
247 |     transport: &mut SseClientType,
248 |     stdout_sink: &mut StdoutSink,
249 | ) -> Result<()> {
250 |     let buffered_messages = std::mem::take(&mut app_state.in_buf);
251 |     debug!("Processing {} buffered messages", buffered_messages.len());
252 | 
253 |     for message in buffered_messages {
254 |         match &message {
255 |             ClientJsonRpcMessage::Request(req) => {
256 |                 let request_id = req.id.clone();
257 |                 let mut req = req.clone();
258 | 
259 |                 let new_id = generate_id();
260 |                 req.id = RequestId::String(new_id.clone().into());
261 |                 app_state.id_map.insert(new_id, request_id.clone());
262 | 
263 |                 if let Err(e) = transport.send(ClientJsonRpcMessage::Request(req)).await {
264 |                     error!("Error sending buffered request: {}", e);
265 |                     let error_response = ServerJsonRpcMessage::error(
266 |                         ErrorData::new(
267 |                             TRANSPORT_SEND_ERROR_CODE,
268 |                             format!("Transport error: {}", e),
269 |                             None,
270 |                         ),
271 |                         request_id,
272 |                     );
273 |                     if let Err(write_err) = stdout_sink.send(error_response).await {
274 |                         error!("Error writing error response to stdout: {}", write_err);
275 |                     }
276 |                 }
277 |             }
278 |             _ => {
279 |                 // Notifications etc.
280 |                 if let Err(e) = transport.send(message.clone()).await {
281 |                     error!("Error sending buffered message: {}", e);
282 |                     // If sending a buffered notification fails, we probably just log it.
283 |                     // Triggering another disconnect cycle might be excessive.
284 |                 }
285 |             }
286 |         }
287 |     }
288 |     Ok(())
289 | }
290 | 
291 | /// Sends error responses for all buffered messages
292 | pub(crate) async fn flush_buffer_with_errors(
293 |     app_state: &mut AppState,
294 |     stdout_sink: &mut StdoutSink,
295 | ) -> Result<()> {
296 |     debug!(
297 |         "Flushing buffer with errors: {} messages",
298 |         app_state.in_buf.len()
299 |     );
300 | 
301 |     let buffered_messages = std::mem::take(&mut app_state.in_buf);
302 |     app_state.buf_mode = BufferMode::Fail;
303 | 
304 |     if !app_state.id_map.is_empty() {
305 |         debug!("Clearing ID map with {} entries", app_state.id_map.len());
306 |         app_state.id_map.clear();
307 |     }
308 | 
309 |     for message in buffered_messages {
310 |         if let ClientJsonRpcMessage::Request(request) = message {
311 |             debug!("Sending error response for buffered request");
312 |             reply_disconnected(&request.id, stdout_sink).await?;
313 |         }
314 |     }
315 | 
316 |     Ok(())
317 | }
318 | 
319 | /// Initiates the post-reconnection handshake by sending the initialize request.
320 | /// Sets the state to WaitingForServerInitHidden.
321 | /// Returns Ok(true) if handshake initiated successfully (or not needed).
322 | /// Returns Ok(false) if sending the init message failed (triggers disconnect).
323 | pub(crate) async fn initiate_post_reconnect_handshake(
324 |     app_state: &mut AppState,
325 |     transport: &mut SseClientType,
326 |     stdout_sink: &mut StdoutSink,
327 | ) -> Result<bool> {
328 |     if let Some(init_msg) = &app_state.init_message {
329 |         let id = if let ClientJsonRpcMessage::Request(req) = init_msg {
330 |             req.id.clone()
331 |         } else {
332 |             error!("Stored init_message is not a request: {:?}", init_msg);
333 |             return Ok(false);
334 |         };
335 | 
336 |         debug!(
337 |             "Initiating post-reconnect handshake by sending: {:?}",
338 |             init_msg
339 |         );
340 |         app_state.state = ProxyState::WaitingForServerInitHidden(id.clone());
341 | 
342 |         if let Err(e) =
343 |             process_client_request(init_msg.clone(), app_state, transport, stdout_sink).await
344 |         {
345 |             info!("Error resending init message during handshake: {}", e);
346 |             app_state.handle_fatal_transport_error();
347 |             Ok(false)
348 |         } else {
349 |             Ok(true)
350 |         }
351 |     } else {
352 |         // If the init_message is None during a reconnect attempt, it's a fatal error.
353 |         error!(
354 |             "No initialization message stored. Cannot reconnect! This indicates a critical state issue."
355 |         );
356 |         // Return an Err to signal a fatal condition that should terminate the proxy.
357 |         Err(anyhow::anyhow!(
358 |             "Cannot perform reconnect handshake: init_message is missing"
359 |         ))
360 |     }
361 | }
362 | 
363 | /// Send a heartbeat ping to check if the transport is still connected.
364 | /// Returns Some(true) if alive, Some(false) if dead, None if check not needed.
365 | pub(crate) async fn send_heartbeat_if_needed(
366 |     app_state: &AppState,
367 |     transport: &mut SseClientType,
368 | ) -> Option<bool> {
369 |     if app_state.last_heartbeat.elapsed() > Duration::from_secs(5) {
370 |         debug!("Checking SSE connection state due to inactivity...");
371 |         match transport.receive().now_or_never() {
372 |             Some(Some(_)) => {
373 |                 debug!("Heartbeat check: Received message/event, connection alive.");
374 |                 Some(true)
375 |             }
376 |             Some(None) => {
377 |                 debug!("Heartbeat check: Stream terminated, connection dead.");
378 |                 Some(false)
379 |             }
380 |             None => {
381 |                 debug!(
382 |                     "Heartbeat check: No immediate message/event, state uncertain but assuming alive for now."
383 |                 );
384 |                 Some(true)
385 |             }
386 |         }
387 |     } else {
388 |         None
389 |     }
390 | }
391 | 


--------------------------------------------------------------------------------
/src/main.rs:
--------------------------------------------------------------------------------
  1 | use anyhow::{Context, Result, anyhow};
  2 | use clap::Parser;
  3 | use futures::StreamExt;
  4 | use rmcp::{
  5 |     model::{ClientJsonRpcMessage, ErrorCode, ServerJsonRpcMessage},
  6 |     transport::{StreamableHttpClientTransport, Transport, sse_client::SseClientTransport},
  7 | };
  8 | use std::env;
  9 | use tokio::io::{Stdin, Stdout};
 10 | use tokio::time::{Duration, Instant, sleep};
 11 | use tokio_util::codec::{FramedRead, FramedWrite};
 12 | use tracing::{debug, error, info, warn};
 13 | use tracing_subscriber::FmtSubscriber;
 14 | 
 15 | // Modules
 16 | mod cli;
 17 | mod core;
 18 | mod state;
 19 | 
 20 | use crate::cli::Args;
 21 | use crate::core::{connect, flush_buffer_with_errors};
 22 | use crate::state::{AppState, ProxyState}; // Only needed directly by main for final check
 23 | 
 24 | // Custom Error Codes (Keep here or move to common/state? Keeping here for now)
 25 | const DISCONNECTED_ERROR_CODE: ErrorCode = ErrorCode(-32010);
 26 | const TRANSPORT_SEND_ERROR_CODE: ErrorCode = ErrorCode(-32011);
 27 | 
 28 | enum SseClientType {
 29 |     Sse(SseClientTransport<reqwest::Client>),
 30 |     Streamable(StreamableHttpClientTransport<reqwest::Client>),
 31 | }
 32 | 
 33 | impl SseClientType {
 34 |     async fn send(
 35 |         &mut self,
 36 |         item: ClientJsonRpcMessage,
 37 |     ) -> Result<(), Box<dyn std::error::Error + Send + Sync + 'static>> {
 38 |         match self {
 39 |             SseClientType::Sse(transport) => transport.send(item).await.map_err(|e| e.into()),
 40 |             SseClientType::Streamable(transport) => {
 41 |                 transport.send(item).await.map_err(|e| e.into())
 42 |             }
 43 |         }
 44 |     }
 45 | 
 46 |     async fn receive(&mut self) -> Option<ServerJsonRpcMessage> {
 47 |         match self {
 48 |             SseClientType::Sse(transport) => transport.receive().await,
 49 |             SseClientType::Streamable(transport) => transport.receive().await,
 50 |         }
 51 |     }
 52 | }
 53 | 
 54 | type StdinCodec = rmcp::transport::async_rw::JsonRpcMessageCodec<ClientJsonRpcMessage>;
 55 | type StdoutCodec = rmcp::transport::async_rw::JsonRpcMessageCodec<ServerJsonRpcMessage>;
 56 | type StdinStream = FramedRead<Stdin, StdinCodec>;
 57 | type StdoutSink = FramedWrite<Stdout, StdoutCodec>;
 58 | 
 59 | // --- Helper for Initial Connection ---
 60 | const INITIAL_CONNECT_TIMEOUT: Duration = Duration::from_secs(5 * 60); // 5 minutes
 61 | 
 62 | /// Attempts to establish the initial SSE connection, retrying on failure.
 63 | async fn connect_with_retry(app_state: &AppState, delay: Duration) -> Result<SseClientType> {
 64 |     let start_time = Instant::now();
 65 |     let mut attempts = 0;
 66 | 
 67 |     loop {
 68 |         attempts += 1;
 69 |         info!(
 70 |             "Attempting initial SSE connection (attempt {})...",
 71 |             attempts
 72 |         );
 73 | 
 74 |         let result = connect(app_state).await;
 75 | 
 76 |         // Try creating the transport
 77 |         match result {
 78 |             Ok(transport) => {
 79 |                 info!("Initial connection successful!");
 80 |                 return Ok(transport);
 81 |             }
 82 |             Err(e) => {
 83 |                 warn!("Attempt {} failed to start transport: {}", attempts, e);
 84 |             }
 85 |         }
 86 | 
 87 |         if start_time.elapsed() >= INITIAL_CONNECT_TIMEOUT {
 88 |             error!(
 89 |                 "Failed to connect after {} attempts over {:?}. Giving up.",
 90 |                 attempts, INITIAL_CONNECT_TIMEOUT
 91 |             );
 92 |             return Err(anyhow!(
 93 |                 "Initial connection timed out after {:?}",
 94 |                 INITIAL_CONNECT_TIMEOUT
 95 |             ));
 96 |         }
 97 | 
 98 |         info!("Retrying in {:?}...", delay);
 99 |         sleep(delay).await;
100 |     }
101 | }
102 | 
103 | // --- Main Function ---
104 | #[tokio::main]
105 | async fn main() -> Result<()> {
106 |     let args = Args::parse();
107 |     let log_level = if args.debug {
108 |         tracing::Level::DEBUG
109 |     } else {
110 |         tracing::Level::INFO
111 |     };
112 | 
113 |     let subscriber = FmtSubscriber::builder()
114 |         .with_max_level(log_level)
115 |         .with_writer(std::io::stderr)
116 |         .finish();
117 | 
118 |     tracing::subscriber::set_global_default(subscriber).context("Failed to set up logging")?;
119 | 
120 |     // Get the SSE URL from args or environment
121 |     let sse_url = match args.sse_url {
122 |           Some(url) => url,
123 |           None => env::var("SSE_URL").context(
124 |               "Either the URL must be passed as the first argument or the SSE_URL environment variable must be set",
125 |           )?,
126 |       };
127 | 
128 |     debug!("Starting MCP proxy with URL: {}", sse_url);
129 |     debug!("Max disconnected time: {:?}s", args.max_disconnected_time);
130 | 
131 |     // Set up communication channels
132 |     let (reconnect_tx, mut reconnect_rx) = tokio::sync::mpsc::channel(10);
133 |     let (timer_tx, mut timer_rx) = tokio::sync::mpsc::channel(10);
134 | 
135 |     // Initialize application state
136 |     let mut app_state = AppState::new(sse_url.clone(), args.max_disconnected_time);
137 |     // Pass channel senders to state
138 |     app_state.reconnect_tx = Some(reconnect_tx.clone());
139 |     app_state.timer_tx = Some(timer_tx.clone());
140 | 
141 |     // Establish initial SSE connection using the retry helper
142 |     info!("Attempting initial connection to {}...", sse_url);
143 |     let mut transport =
144 |         connect_with_retry(&app_state, Duration::from_secs(args.initial_retry_interval)).await?;
145 | 
146 |     info!("Connection established. Proxy operational.");
147 |     app_state.state = ProxyState::WaitingForClientInit;
148 | 
149 |     let stdin = tokio::io::stdin();
150 |     let stdout = tokio::io::stdout();
151 |     let mut stdin_stream: StdinStream = FramedRead::new(stdin, StdinCodec::default());
152 |     let mut stdout_sink: StdoutSink = FramedWrite::new(stdout, StdoutCodec::default());
153 | 
154 |     info!("Connected to SSE endpoint, starting proxy");
155 | 
156 |     // Set up heartbeat interval
157 |     let mut heartbeat_interval = tokio::time::interval(Duration::from_secs(1));
158 | 
159 |     // Main event loop
160 |     loop {
161 |         tokio::select! {
162 |             // Bias select towards checking cheaper/more frequent events first if needed,
163 |             // but default Tokio select is fair.
164 |             biased;
165 |             // Handle message from stdin
166 |             msg = stdin_stream.next() => {
167 |                 if !app_state.handle_stdin_message(msg, &mut transport, &mut stdout_sink).await? {
168 |                     break;
169 |                 }
170 |             }
171 |             // Handle message from SSE server
172 |             result = transport.receive(), if app_state.transport_valid => {
173 |                 if !app_state.handle_sse_message(result, &mut transport, &mut stdout_sink).await? {
174 |                     break;
175 |                 }
176 |             }
177 |             // Handle reconnect signal
178 |             Some(_) = reconnect_rx.recv() => {
179 |                 // Call method on app_state
180 |                 if let Some(new_transport) = app_state.handle_reconnect_signal(&mut stdout_sink).await? {
181 |                     transport = new_transport;
182 |                 }
183 |                 // Check if disconnected too long *after* attempting reconnect
184 |                 if app_state.disconnected_too_long() {
185 |                     error!("Giving up after failed reconnection attempts and exceeding max disconnected time.");
186 |                     // Ensure buffer is flushed if not already done by handle_reconnect_signal
187 |                     if !app_state.in_buf.is_empty() && app_state.buf_mode == state::BufferMode::Store {
188 |                         flush_buffer_with_errors(&mut app_state, &mut stdout_sink).await?;
189 |                     }
190 |                     break;
191 |                 }
192 |             }
193 |             // Handle flush timer signal
194 |             Some(_) = timer_rx.recv() => app_state.handle_timer_signal(&mut stdout_sink).await?,
195 |             // Handle heartbeat tick
196 |             _ = heartbeat_interval.tick() => app_state.handle_heartbeat_tick(&mut transport).await?,
197 |             // Exit if no events are ready (shouldn't happen with interval timers unless others close)
198 |             else => break,
199 |         }
200 |     }
201 | 
202 |     info!("Proxy terminated");
203 |     Ok(())
204 | }
205 | 


--------------------------------------------------------------------------------
/src/state.rs:
--------------------------------------------------------------------------------
  1 | use crate::core::{
  2 |     flush_buffer_with_errors, generate_id, initiate_post_reconnect_handshake,
  3 |     process_buffered_messages, process_client_request, reply_disconnected,
  4 |     send_heartbeat_if_needed, try_reconnect,
  5 | };
  6 | use crate::{SseClientType, StdoutSink};
  7 | use anyhow::Result;
  8 | use futures::SinkExt;
  9 | use rmcp::model::{
 10 |     ClientJsonRpcMessage, ClientNotification, ClientRequest, EmptyResult, InitializedNotification,
 11 |     InitializedNotificationMethod, RequestId, ServerJsonRpcMessage,
 12 | };
 13 | use std::collections::HashMap;
 14 | use std::time::{Duration, Instant};
 15 | use tokio::sync::mpsc::Sender;
 16 | use tokio::time::sleep;
 17 | use tracing::{debug, error, info, warn};
 18 | 
 19 | /// Reasons why a reconnection attempt might fail.
 20 | #[derive(Debug)]
 21 | pub enum ReconnectFailureReason {
 22 |     TimeoutExceeded,
 23 |     ConnectionFailed(anyhow::Error),
 24 | }
 25 | 
 26 | /// Buffer mode for message handling during disconnection
 27 | #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 28 | pub enum BufferMode {
 29 |     Store,
 30 |     Fail,
 31 | }
 32 | 
 33 | /// Proxy state to track connection and message handling
 34 | #[derive(Debug, Clone, PartialEq, Eq)]
 35 | pub enum ProxyState {
 36 |     Connecting,
 37 |     Connected,
 38 |     Disconnected,
 39 |     WaitingForClientInit,
 40 |     WaitingForServerInit(RequestId),
 41 |     WaitingForServerInitHidden(RequestId),
 42 |     WaitingForClientInitialized,
 43 | }
 44 | 
 45 | /// Application state for the proxy
 46 | #[derive(Debug)]
 47 | pub struct AppState {
 48 |     /// URL of the SSE server
 49 |     pub url: String,
 50 |     /// Maximum time to try reconnecting in seconds (None = infinity)
 51 |     pub max_disconnected_time: Option<u64>,
 52 |     /// When we were disconnected
 53 |     pub disconnected_since: Option<Instant>,
 54 |     /// Current state of the application
 55 |     pub state: ProxyState,
 56 |     /// Number of connection attempts
 57 |     pub connect_tries: u32,
 58 |     /// The initialization message (for reconnection)
 59 |     pub init_message: Option<ClientJsonRpcMessage>,
 60 |     /// Map of generated IDs to original IDs (Client -> Server flow)
 61 |     pub id_map: HashMap<String, RequestId>,
 62 |     /// Buffer for holding messages during reconnection
 63 |     pub in_buf: Vec<ClientJsonRpcMessage>,
 64 |     /// Buffer mode (store or fail)
 65 |     pub buf_mode: BufferMode,
 66 |     /// Whether a flush timer is in progress
 67 |     pub flush_timer_active: bool,
 68 |     /// Channel sender for reconnect events
 69 |     pub reconnect_tx: Option<Sender<()>>,
 70 |     /// Channel sender for timer events
 71 |     pub timer_tx: Option<Sender<()>>,
 72 |     /// Whether reconnect is already scheduled
 73 |     pub reconnect_scheduled: bool,
 74 |     /// Whether the transport is still valid
 75 |     pub transport_valid: bool,
 76 |     /// Time of last heartbeat check
 77 |     pub last_heartbeat: Instant,
 78 | }
 79 | 
 80 | impl AppState {
 81 |     pub fn new(url: String, max_disconnected_time: Option<u64>) -> Self {
 82 |         Self {
 83 |             url,
 84 |             max_disconnected_time,
 85 |             disconnected_since: None,
 86 |             state: ProxyState::Connecting,
 87 |             connect_tries: 0,
 88 |             init_message: None,
 89 |             id_map: HashMap::new(),
 90 |             in_buf: Vec::new(),
 91 |             buf_mode: BufferMode::Store,
 92 |             flush_timer_active: false,
 93 |             reconnect_tx: None,
 94 |             timer_tx: None,
 95 |             reconnect_scheduled: false,
 96 |             transport_valid: true,
 97 |             last_heartbeat: Instant::now(),
 98 |         }
 99 |     }
100 | 
101 |     pub fn connected(&mut self) {
102 |         self.state = ProxyState::Connected;
103 |         self.connect_tries = 0;
104 |         self.disconnected_since = None;
105 |         self.buf_mode = BufferMode::Store;
106 |         self.reconnect_scheduled = false;
107 |         self.transport_valid = true;
108 |         self.last_heartbeat = Instant::now();
109 |     }
110 | 
111 |     pub fn disconnected(&mut self) {
112 |         if self.state != ProxyState::Disconnected {
113 |             debug!("State changing to disconnected");
114 |             self.state = ProxyState::Disconnected;
115 |             self.disconnected_since = Some(Instant::now());
116 |             self.buf_mode = BufferMode::Store;
117 |             self.transport_valid = false;
118 |         }
119 |         self.connect_tries += 1;
120 |     }
121 | 
122 |     pub fn disconnected_too_long(&self) -> bool {
123 |         match (self.max_disconnected_time, self.disconnected_since) {
124 |             (Some(max_time), Some(since)) => since.elapsed().as_secs() > max_time,
125 |             _ => false,
126 |         }
127 |     }
128 | 
129 |     pub fn get_backoff_duration(&self) -> Duration {
130 |         let seconds = std::cmp::min(2u64.pow(self.connect_tries.saturating_sub(1)), 8);
131 |         Duration::from_secs(seconds)
132 |     }
133 | 
134 |     pub fn schedule_reconnect(&mut self) {
135 |         if !self.reconnect_scheduled {
136 |             if let Some(tx) = &self.reconnect_tx {
137 |                 let tx_clone = tx.clone();
138 |                 let backoff = self.get_backoff_duration();
139 |                 debug!("Scheduling reconnect in {}s", backoff.as_secs());
140 |                 tokio::spawn(async move {
141 |                     sleep(backoff).await;
142 |                     let _ = tx_clone.send(()).await;
143 |                 });
144 |                 self.reconnect_scheduled = true;
145 |             }
146 |         } else {
147 |             debug!("Reconnect already scheduled, skipping");
148 |         }
149 |     }
150 | 
151 |     pub fn schedule_flush_timer(&mut self) {
152 |         if !self.flush_timer_active {
153 |             if let Some(tx) = &self.timer_tx {
154 |                 debug!("Scheduling flush timer for 20s");
155 |                 self.flush_timer_active = true;
156 |                 let tx_clone = tx.clone();
157 |                 tokio::spawn(async move {
158 |                     sleep(Duration::from_secs(20)).await;
159 |                     let _ = tx_clone.send(()).await;
160 |                 });
161 |             }
162 |         } else {
163 |             debug!("Flush timer already active, skipping");
164 |         }
165 |     }
166 | 
167 |     pub fn update_heartbeat(&mut self) {
168 |         self.last_heartbeat = Instant::now();
169 |     }
170 | 
171 |     /// Handles common logic for fatal transport errors:
172 |     /// Sets state to disconnected and schedules timer/reconnect.
173 |     pub fn handle_fatal_transport_error(&mut self) {
174 |         if self.state != ProxyState::Disconnected {
175 |             self.disconnected();
176 |             self.schedule_flush_timer();
177 |             self.schedule_reconnect();
178 |         }
179 |     }
180 | 
181 |     /// Handles messages received from stdin.
182 |     /// Returns Ok(true) to continue processing, Ok(false) to break the main loop.
183 |     pub(crate) async fn handle_stdin_message(
184 |         &mut self,
185 |         msg: Option<
186 |             Result<ClientJsonRpcMessage, rmcp::transport::async_rw::JsonRpcMessageCodecError>,
187 |         >,
188 |         transport: &mut SseClientType,
189 |         stdout_sink: &mut StdoutSink,
190 |     ) -> Result<bool> {
191 |         match msg {
192 |             Some(Ok(message)) => {
193 |                 process_client_request(message, self, transport, stdout_sink).await?;
194 |                 Ok(true)
195 |             }
196 |             Some(Err(e)) => {
197 |                 error!("Error reading from stdin: {}", e);
198 |                 Ok(false)
199 |             }
200 |             None => {
201 |                 info!("Stdin stream ended.");
202 |                 Ok(false)
203 |             }
204 |         }
205 |     }
206 | 
207 |     /// Handles messages received from the SSE transport.
208 |     /// Returns Ok(true) to continue processing, Ok(false) to break the main loop.
209 |     pub(crate) async fn handle_sse_message(
210 |         &mut self,
211 |         result: Option<ServerJsonRpcMessage>,
212 |         transport: &mut SseClientType,
213 |         stdout_sink: &mut StdoutSink,
214 |     ) -> Result<bool> {
215 |         debug!("Received SSE message: {:?}", result);
216 |         match result {
217 |             Some(mut message) => {
218 |                 self.update_heartbeat();
219 | 
220 |                 // --- Handle Server-Initiated Request ---
221 |                 if let ServerJsonRpcMessage::Request(mut req) = message {
222 |                     let server_id = req.id.clone();
223 |                     let proxy_id_str = generate_id();
224 |                     let proxy_id = RequestId::String(proxy_id_str.clone().into());
225 |                     debug!(
226 |                         "Mapping server request ID {} to proxy ID {}",
227 |                         server_id, proxy_id
228 |                     );
229 |                     self.id_map.insert(proxy_id_str, server_id);
230 |                     req.id = proxy_id;
231 |                     message = ServerJsonRpcMessage::Request(req);
232 |                     // Now fall through to forward the modified request
233 |                 }
234 |                 // --- End Server-Initiated Request Handling ---
235 |                 else {
236 |                     match self.map_server_response_error_id(message) {
237 |                         Some(mapped_message) => message = mapped_message,
238 |                         None => return Ok(true), // Skip forwarding this message
239 |                     }
240 |                     // --- Handle Initialization Response --- (Only for Response/Error)
241 |                     let is_init_response = match &message {
242 |                         ServerJsonRpcMessage::Response(response) => match self.state {
243 |                             ProxyState::WaitingForServerInit(ref init_request_id) => {
244 |                                 *init_request_id == response.id
245 |                             }
246 |                             ProxyState::WaitingForServerInitHidden(ref init_request_id) => {
247 |                                 *init_request_id == response.id
248 |                             }
249 |                             _ => false,
250 |                         },
251 |                         // Don't treat errors related to init ID as special init responses
252 |                         _ => false,
253 |                     };
254 | 
255 |                     debug!(
256 |                         "Handling initialization response - state: {:?}, message: {:?}, is_init_response: {}",
257 |                         self.state, message, is_init_response
258 |                     );
259 | 
260 |                     if is_init_response {
261 |                         let was_hidden =
262 |                             matches!(self.state, ProxyState::WaitingForServerInitHidden(_));
263 |                         if was_hidden {
264 |                             self.connected();
265 |                             debug!("Reconnection successful, received hidden init response");
266 |                             let initialized_notification = ClientJsonRpcMessage::notification(
267 |                                 ClientNotification::InitializedNotification(
268 |                                     InitializedNotification {
269 |                                         method: InitializedNotificationMethod,
270 |                                         extensions: rmcp::model::Extensions::default(),
271 |                                     },
272 |                                 ),
273 |                             );
274 |                             if let Err(e) = transport.send(initialized_notification).await {
275 |                                 error!(
276 |                                     "Error sending initialized notification post-reconnect: {}",
277 |                                     e
278 |                                 );
279 |                                 self.handle_fatal_transport_error();
280 |                             } else {
281 |                                 process_buffered_messages(self, transport, stdout_sink).await?;
282 |                             }
283 |                             return Ok(true); // Don't forward the init response
284 |                         } else {
285 |                             debug!(
286 |                                 "Initial connection successful, received init response. Waiting for client initialized."
287 |                             );
288 |                             self.state = ProxyState::WaitingForClientInitialized;
289 |                         }
290 |                     }
291 |                     // --- End Initialization Response Handling ---
292 |                 }
293 | 
294 |                 // Forward the (potentially modified) message to stdout
295 |                 // This now handles mapped server requests, mapped responses/errors, and notifications
296 |                 debug!("Forwarding from SSE to stdout: {:?}", message);
297 |                 if let Err(e) = stdout_sink.send(message).await {
298 |                     error!("Error writing to stdout: {}", e);
299 |                     return Ok(false);
300 |                 }
301 | 
302 |                 Ok(true)
303 |             }
304 |             None => {
305 |                 debug!("SSE stream ended (Fatal error in transport) - trying to reconnect");
306 |                 self.handle_fatal_transport_error();
307 |                 Ok(true)
308 |             }
309 |         }
310 |     }
311 | 
312 |     pub(crate) async fn maybe_handle_message_while_disconnected(
313 |         &mut self,
314 |         message: ClientJsonRpcMessage,
315 |         stdout_sink: &mut StdoutSink,
316 |     ) -> Result<()> {
317 |         if self.state != ProxyState::Disconnected {
318 |             return Err(anyhow::anyhow!("Not disconnected"));
319 |         }
320 | 
321 |         // Handle ping directly if disconnected
322 |         if let ClientJsonRpcMessage::Request(ref req) = message {
323 |             if let ClientRequest::PingRequest(_) = &req.request {
324 |                 debug!(
325 |                     "Received Ping request while disconnected, replying directly: {:?}",
326 |                     req.id
327 |                 );
328 |                 let response = ServerJsonRpcMessage::response(
329 |                     rmcp::model::ServerResult::EmptyResult(EmptyResult {}),
330 |                     req.id.clone(),
331 |                 );
332 |                 if let Err(e) = stdout_sink.send(response).await {
333 |                     error!("Error sending direct ping response to stdout: {}", e);
334 |                 }
335 |                 return Ok(());
336 |             }
337 |             if self.buf_mode == BufferMode::Store {
338 |                 debug!("Buffering request for later retry");
339 |                 self.in_buf.push(message);
340 |             } else {
341 |                 reply_disconnected(&req.id, stdout_sink).await?;
342 |             }
343 |         }
344 | 
345 |         Ok(())
346 |     }
347 | 
348 |     /// Handles the reconnect signal.
349 |     /// Returns the potentially new transport if reconnection was successful.
350 |     pub(crate) async fn handle_reconnect_signal(
351 |         &mut self,
352 |         stdout_sink: &mut StdoutSink,
353 |     ) -> Result<Option<SseClientType>> {
354 |         debug!("Received reconnect signal");
355 |         self.reconnect_scheduled = false;
356 | 
357 |         if self.state == ProxyState::Disconnected {
358 |             match try_reconnect(self).await {
359 |                 Ok(mut new_transport) => {
360 |                     self.transport_valid = true;
361 | 
362 |                     initiate_post_reconnect_handshake(self, &mut new_transport, stdout_sink)
363 |                         .await
364 |                         .map(|success| {
365 |                             if success {
366 |                                 Some(new_transport)
367 |                             } else {
368 |                                 None // Handshake failed non-fatally, no new transport
369 |                             }
370 |                         })
371 |                 }
372 |                 Err(reason) => {
373 |                     self.connect_tries += 1;
374 |                     match reason {
375 |                         ReconnectFailureReason::TimeoutExceeded => {
376 |                             error!(
377 |                                 "Reconnect attempt {} failed: Timeout exceeded",
378 |                                 self.connect_tries
379 |                             );
380 |                             info!("Disconnected too long, flushing buffer.");
381 |                             flush_buffer_with_errors(self, stdout_sink).await?;
382 |                         }
383 |                         ReconnectFailureReason::ConnectionFailed(e) => {
384 |                             error!(
385 |                                 "Reconnect attempt {} failed: Connection error: {}",
386 |                                 self.connect_tries, e
387 |                             );
388 |                             if !self.disconnected_too_long() {
389 |                                 self.schedule_reconnect();
390 |                             } else {
391 |                                 info!(
392 |                                     "Disconnected too long after failed connect, flushing buffer."
393 |                                 );
394 |                                 flush_buffer_with_errors(self, stdout_sink).await?;
395 |                             }
396 |                         }
397 |                     }
398 |                     Ok(None)
399 |                 }
400 |             }
401 |         } else {
402 |             Ok(None)
403 |         }
404 |     }
405 | 
406 |     /// Handles the flush timer signal.
407 |     pub(crate) async fn handle_timer_signal(&mut self, stdout_sink: &mut StdoutSink) -> Result<()> {
408 |         debug!("Received flush timer signal");
409 |         self.flush_timer_active = false;
410 |         if self.state == ProxyState::Disconnected {
411 |             info!("Still disconnected after 20 seconds, flushing buffer with errors");
412 |             flush_buffer_with_errors(self, stdout_sink).await?;
413 |         }
414 |         Ok(())
415 |     }
416 | 
417 |     /// Handles the heartbeat interval tick.
418 |     pub(crate) async fn handle_heartbeat_tick(
419 |         &mut self,
420 |         transport: &mut SseClientType,
421 |     ) -> Result<()> {
422 |         if self.state == ProxyState::Connected {
423 |             let check_result = send_heartbeat_if_needed(self, transport).await;
424 |             match check_result {
425 |                 Some(true) => {
426 |                     self.update_heartbeat();
427 |                 }
428 |                 Some(false) => {
429 |                     self.handle_fatal_transport_error();
430 |                 }
431 |                 None => {}
432 |             }
433 |         }
434 |         Ok(())
435 |     }
436 | 
437 |     // --- ID Mapping Helpers ---
438 |     fn lookup_and_remove_original_id(&mut self, current_id: &RequestId) -> Option<RequestId> {
439 |         let lookup_key = current_id.to_string();
440 |         self.id_map.remove(&lookup_key)
441 |     }
442 | 
443 |     // Add the client mapping logic here
444 |     pub(crate) fn map_client_response_error_id(
445 |         &mut self,
446 |         message: ClientJsonRpcMessage,
447 |     ) -> Option<ClientJsonRpcMessage> {
448 |         let (id_to_check, is_response_or_error) = match &message {
449 |             ClientJsonRpcMessage::Response(res) => (Some(res.id.clone()), true),
450 |             ClientJsonRpcMessage::Error(err) => (Some(err.id.clone()), true),
451 |             _ => (None, false), // Requests or Notifications are not mapped back this way
452 |         };
453 | 
454 |         if is_response_or_error {
455 |             if let Some(current_id) = id_to_check {
456 |                 if let Some(original_id) = self.lookup_and_remove_original_id(&current_id) {
457 |                     debug!(
458 |                         "Mapping client message ID {} back to original server ID: {}",
459 |                         current_id, original_id
460 |                     );
461 |                     return Some(match message {
462 |                         ClientJsonRpcMessage::Response(mut res) => {
463 |                             res.id = original_id;
464 |                             ClientJsonRpcMessage::Response(res)
465 |                         }
466 |                         ClientJsonRpcMessage::Error(mut err) => {
467 |                             err.id = original_id;
468 |                             ClientJsonRpcMessage::Error(err)
469 |                         }
470 |                         _ => message, // Should not happen
471 |                     });
472 |                 } else {
473 |                     // ID not found, return None to prevent forwarding
474 |                     warn!(
475 |                         "Received client response/error with unknown ID: {}, skipping forwarding.",
476 |                         current_id
477 |                     );
478 |                     return None;
479 |                 }
480 |             } else {
481 |                 // Error message has no ID (should not happen for JSON-RPC errors)
482 |                 warn!("Received client error message without an ID, skipping forwarding.");
483 |                 return None;
484 |             }
485 |         }
486 |         // Not a response/error, return Some(original_message)
487 |         Some(message)
488 |     }
489 | 
490 |     /// Checks if a server message (Response or Error) has an ID corresponding
491 |     /// to a mapped client request ID. If found, replaces the message's ID with
492 |     /// the original client ID and returns `Some` modified message.
493 |     /// Otherwise, returns `None`.
494 |     // Renamed from try_map_server_message_id and made private
495 |     pub(crate) fn map_server_response_error_id(
496 |         &mut self,
497 |         message: ServerJsonRpcMessage,
498 |     ) -> Option<ServerJsonRpcMessage> {
499 |         let (id_to_check, is_response_or_error) = match &message {
500 |             ServerJsonRpcMessage::Response(res) => (Some(res.id.clone()), true),
501 |             ServerJsonRpcMessage::Error(err) => (Some(err.id.clone()), true),
502 |             _ => (None, false), // Notifications or Requests are not mapped back
503 |         };
504 | 
505 |         if is_response_or_error {
506 |             if let Some(current_id) = id_to_check {
507 |                 if let Some(original_id) = self.lookup_and_remove_original_id(&current_id) {
508 |                     debug!(
509 |                         "Mapping server message ID {} back to original client ID: {}",
510 |                         current_id, original_id
511 |                     );
512 |                     return Some(match message {
513 |                         ServerJsonRpcMessage::Response(mut res) => {
514 |                             res.id = original_id;
515 |                             ServerJsonRpcMessage::Response(res)
516 |                         }
517 |                         ServerJsonRpcMessage::Error(mut err) => {
518 |                             err.id = original_id;
519 |                             ServerJsonRpcMessage::Error(err)
520 |                         }
521 |                         _ => message, // Should not happen due to is_response_or_error check
522 |                     });
523 |                 } else {
524 |                     // ID not found, return None to prevent forwarding
525 |                     warn!(
526 |                         "Received server response/error with unknown ID: {}, skipping forwarding.",
527 |                         current_id
528 |                     );
529 |                     return None;
530 |                 }
531 |             } else {
532 |                 // Error message has no ID (should not happen for JSON-RPC errors)
533 |                 warn!("Received server error message without an ID, skipping forwarding.");
534 |                 return None;
535 |             }
536 |         }
537 |         // Not a response/error, return Some(original_message)
538 |         Some(message)
539 |     }
540 | }
541 | 


--------------------------------------------------------------------------------
/tests/advanced_test.rs:
--------------------------------------------------------------------------------
  1 | mod echo;
  2 | use anyhow::Result;
  3 | use rmcp::{
  4 |     ServiceExt,
  5 |     model::CallToolRequestParam,
  6 |     object,
  7 |     transport::{ConfigureCommandExt, TokioChildProcess},
  8 | };
  9 | use std::{
 10 |     net::SocketAddr,
 11 |     sync::{Arc, Mutex},
 12 |     time::Duration,
 13 | };
 14 | use tokio::{
 15 |     io::{AsyncBufReadExt, AsyncWriteExt, BufReader},
 16 |     time::{sleep, timeout},
 17 | };
 18 | 
 19 | /// A guard that ensures processes are killed on drop, especially on test failures (panics)
 20 | struct TestGuard {
 21 |     child: Option<tokio::process::Child>,
 22 |     server_handle: Option<tokio::process::Child>,
 23 |     stderr_buffer: Arc<Mutex<Vec<String>>>,
 24 | }
 25 | 
 26 | impl TestGuard {
 27 |     fn new(
 28 |         child: tokio::process::Child,
 29 |         server_handle: tokio::process::Child,
 30 |         stderr_buffer: Arc<Mutex<Vec<String>>>,
 31 |     ) -> Self {
 32 |         Self {
 33 |             child: Some(child),
 34 |             server_handle: Some(server_handle),
 35 |             stderr_buffer,
 36 |         }
 37 |     }
 38 | }
 39 | 
 40 | impl Drop for TestGuard {
 41 |     fn drop(&mut self) {
 42 |         // If we're dropping because of a panic, print the stderr content
 43 |         if std::thread::panicking() {
 44 |             eprintln!("Test failed! Process stderr output:");
 45 |             for line in self.stderr_buffer.lock().unwrap().iter() {
 46 |                 eprintln!("{}", line);
 47 |             }
 48 |         }
 49 | 
 50 |         // Force kill both processes
 51 |         if let Some(mut child) = self.child.take() {
 52 |             let _ = child.start_kill();
 53 |         }
 54 |         if let Some(mut server_handle) = self.server_handle.take() {
 55 |             let _ = server_handle.start_kill();
 56 |         }
 57 |     }
 58 | }
 59 | 
 60 | /// Spawns a proxy process with stdin, stdout, and stderr all captured
 61 | async fn spawn_proxy(
 62 |     server_url: &str,
 63 |     extra_args: Vec<&str>,
 64 | ) -> Result<(
 65 |     tokio::process::Child,
 66 |     tokio::io::BufReader<tokio::process::ChildStdout>,
 67 |     tokio::io::BufReader<tokio::process::ChildStderr>,
 68 |     tokio::process::ChildStdin,
 69 | )> {
 70 |     let mut cmd = tokio::process::Command::new("./target/debug/mcp-proxy");
 71 |     cmd.arg(server_url)
 72 |         .args(extra_args)
 73 |         .stdout(std::process::Stdio::piped())
 74 |         .stderr(std::process::Stdio::piped())
 75 |         .stdin(std::process::Stdio::piped());
 76 | 
 77 |     let mut child = cmd.spawn()?;
 78 |     let stdin = child.stdin.take().unwrap();
 79 |     let stdout = BufReader::new(child.stdout.take().unwrap());
 80 |     let stderr = BufReader::new(child.stderr.take().unwrap());
 81 | 
 82 |     Ok((child, stdout, stderr, stdin))
 83 | }
 84 | 
 85 | /// Collects stderr lines in the background
 86 | fn collect_stderr(
 87 |     mut stderr_reader: BufReader<tokio::process::ChildStderr>,
 88 | ) -> Arc<Mutex<Vec<String>>> {
 89 |     let stderr_buffer = Arc::new(Mutex::new(Vec::new()));
 90 |     let buffer_clone = stderr_buffer.clone();
 91 | 
 92 |     tokio::spawn(async move {
 93 |         let mut line = String::new();
 94 |         while let Ok(bytes_read) = stderr_reader.read_line(&mut line).await {
 95 |             if bytes_read == 0 {
 96 |                 break;
 97 |             }
 98 |             buffer_clone.lock().unwrap().push(line.clone());
 99 |             line.clear();
100 |         }
101 |     });
102 | 
103 |     stderr_buffer
104 | }
105 | 
106 | // Creates a new SSE server for testing
107 | // Starts the echo-server as a subprocess
108 | async fn create_sse_server(
109 |     server_name: &str,
110 |     address: SocketAddr,
111 | ) -> Result<(tokio::process::Child, String)> {
112 |     let url = if server_name == "echo_streamable" {
113 |         format!("http://{}", address)
114 |     } else {
115 |         format!("http://{}/sse", address)
116 |     };
117 | 
118 |     tracing::info!("Starting echo-server at {}", url);
119 | 
120 |     // Create echo-server process
121 |     let mut cmd = tokio::process::Command::new(format!("./target/debug/examples/{}", server_name));
122 |     cmd.arg("--address").arg(address.to_string());
123 | 
124 |     tracing::debug!("cmd: {:?}", cmd);
125 | 
126 |     // Start the process with stdout/stderr redirected to null
127 |     let child = cmd
128 |         .stdout(std::process::Stdio::null())
129 |         .stderr(std::process::Stdio::null())
130 |         .spawn()?;
131 | 
132 |     // Give the server time to start up
133 |     sleep(Duration::from_millis(500)).await;
134 |     tracing::info!("{} server started successfully", server_name);
135 | 
136 |     Ok((child, url))
137 | }
138 | 
139 | async fn protocol_initialization(server_name: &str) -> Result<()> {
140 |     const BIND_ADDRESS: &str = "127.0.0.1:8181";
141 |     let (server_handle, server_url) = create_sse_server(server_name, BIND_ADDRESS.parse()?).await?;
142 | 
143 |     // Create a child process for the proxy with stderr capture
144 |     let (child, mut reader, stderr_reader, mut stdin) = spawn_proxy(&server_url, vec![]).await?;
145 |     let stderr_buffer = collect_stderr(stderr_reader);
146 |     let _guard = TestGuard::new(child, server_handle, stderr_buffer);
147 | 
148 |     // Send initialization message
149 |     let init_message = r#"{"jsonrpc":"2.0","id":"init-1","method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"test","version":"0.1.0"}}}"#;
150 |     stdin.write_all(init_message.as_bytes()).await?;
151 |     stdin.write_all(b"\n").await?;
152 | 
153 |     // Read the response
154 |     let mut response = String::new();
155 |     reader.read_line(&mut response).await?;
156 | 
157 |     // Verify the response contains expected data
158 |     assert!(response.contains("\"id\":\"init-1\""));
159 |     assert!(response.contains("\"result\""));
160 | 
161 |     // Send initialized notification
162 |     let initialized_message = r#"{"jsonrpc":"2.0","method":"notifications/initialized"}"#;
163 |     stdin.write_all(initialized_message.as_bytes()).await?;
164 |     stdin.write_all(b"\n").await?;
165 | 
166 |     // Call the echo tool
167 |     let echo_call = r#"{"jsonrpc":"2.0","id":"call-1","method":"tools/call","params":{"name":"echo","arguments":{"message":"Hey!"}}}"#;
168 |     stdin.write_all(echo_call.as_bytes()).await?;
169 |     stdin.write_all(b"\n").await?;
170 | 
171 |     // Read the response
172 |     let mut echo_response = String::new();
173 |     reader.read_line(&mut echo_response).await?;
174 | 
175 |     // Verify the echo response
176 |     assert!(echo_response.contains("\"id\":\"call-1\""));
177 |     assert!(echo_response.contains("Hey!"));
178 | 
179 |     Ok(())
180 | }
181 | 
182 | #[tokio::test]
183 | async fn test_protocol_initialization() -> Result<()> {
184 |     protocol_initialization("echo").await?;
185 |     protocol_initialization("echo_streamable").await?;
186 | 
187 |     Ok(())
188 | }
189 | 
190 | async fn reconnection_handling(server_name: &str) -> Result<()> {
191 |     let subscriber = tracing_subscriber::fmt()
192 |         .with_max_level(tracing::Level::DEBUG)
193 |         .with_test_writer()
194 |         .finish();
195 |     let _guard = tracing::subscriber::set_default(subscriber);
196 | 
197 |     const BIND_ADDRESS: &str = "127.0.0.1:8182";
198 | 
199 |     // Start the SSE server
200 |     tracing::info!("Test: Starting initial SSE server");
201 |     let (server_handle, server_url) = create_sse_server(server_name, BIND_ADDRESS.parse()?).await?;
202 | 
203 |     // Create a child process for the proxy
204 |     tracing::info!("Test: Creating proxy process");
205 |     let (child, mut reader, stderr_reader, mut stdin) = spawn_proxy(&server_url, vec![]).await?;
206 |     let stderr_buffer = collect_stderr(stderr_reader);
207 |     let mut test_guard = TestGuard::new(child, server_handle, stderr_buffer);
208 | 
209 |     // Send initialization message
210 |     let init_message = r#"{"jsonrpc":"2.0","id":"init-1","method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"test","version":"0.1.0"}}}"#;
211 |     stdin.write_all(init_message.as_bytes()).await?;
212 |     stdin.write_all(b"\n").await?;
213 | 
214 |     // Read the response
215 |     let mut response = String::new();
216 |     reader.read_line(&mut response).await?;
217 | 
218 |     // Send initialized notification
219 |     let initialized_message = r#"{"jsonrpc":"2.0","method":"notifications/initialized"}"#;
220 |     stdin.write_all(initialized_message.as_bytes()).await?;
221 |     stdin.write_all(b"\n").await?;
222 | 
223 |     // Call the echo tool to ensure server is working
224 |     let initial_echo_call = r#"{"jsonrpc":"2.0","id":"call-1","method":"tools/call","params":{"name":"echo","arguments":{"message":"Initial Call"}}}"#;
225 |     stdin.write_all(initial_echo_call.as_bytes()).await?;
226 |     stdin.write_all(b"\n").await?;
227 | 
228 |     let mut initial_echo_response = String::new();
229 |     reader.read_line(&mut initial_echo_response).await?;
230 |     assert!(
231 |         initial_echo_response.contains("Initial Call"),
232 |         "Initial echo call failed"
233 |     );
234 | 
235 |     // Shutdown the server
236 |     if let Some(mut server) = test_guard.server_handle.take() {
237 |         server.kill().await?;
238 |     }
239 | 
240 |     // Give the server time to shut down
241 |     sleep(Duration::from_millis(1000)).await;
242 | 
243 |     // Create a new server on the same address
244 |     tracing::info!("Test: Starting new SSE server");
245 |     let (new_server_handle, new_url) =
246 |         create_sse_server(server_name, BIND_ADDRESS.parse()?).await?;
247 |     assert_eq!(
248 |         server_url, new_url,
249 |         "New server URL should match the original"
250 |     );
251 | 
252 |     // Update the test guard with the new server handle
253 |     test_guard.server_handle = Some(new_server_handle);
254 | 
255 |     // Give the proxy time to reconnect
256 |     sleep(Duration::from_millis(3000)).await;
257 | 
258 |     // Call the echo tool after reconnection
259 |     let echo_call = r#"{"jsonrpc":"2.0","id":"call-2","method":"tools/call","params":{"name":"echo","arguments":{"message":"After Reconnect"}}}"#;
260 |     stdin.write_all(echo_call.as_bytes()).await?;
261 |     stdin.write_all(b"\n").await?;
262 | 
263 |     // Read the response
264 |     let mut echo_response = String::new();
265 |     reader.read_line(&mut echo_response).await?;
266 | 
267 |     tracing::info!("Test: Received echo response: {}", echo_response.trim());
268 | 
269 |     // Even if the response contains an error, we should at least get a response
270 |     assert!(
271 |         echo_response.contains("\"id\":\"call-2\""),
272 |         "No response received after reconnection"
273 |     );
274 | 
275 |     Ok(())
276 | }
277 | 
278 | #[tokio::test]
279 | async fn test_reconnection_handling() -> Result<()> {
280 |     reconnection_handling("echo").await?;
281 |     reconnection_handling("echo_streamable").await?;
282 | 
283 |     Ok(())
284 | }
285 | 
286 | async fn server_info_and_capabilities(server_name: &str) -> Result<()> {
287 |     const BIND_ADDRESS: &str = "127.0.0.1:8183";
288 |     // Start the SSE server
289 |     let (mut server_handle, server_url) =
290 |         create_sse_server(server_name, BIND_ADDRESS.parse()?).await?;
291 | 
292 |     // Create a transport for the proxy
293 |     let transport = TokioChildProcess::new(
294 |         tokio::process::Command::new("./target/debug/mcp-proxy").configure(|cmd| {
295 |             cmd.arg(&server_url);
296 |         }),
297 |     )?;
298 | 
299 |     // Connect a client to the proxy
300 |     let client = ().serve(transport).await?;
301 | 
302 |     // List available tools
303 |     let tools = client.list_all_tools().await?;
304 | 
305 |     // Verify the echo tool is available
306 |     assert!(tools.iter().any(|t| t.name == "echo"));
307 | 
308 |     // Call the echo tool with a test message
309 |     if let Some(echo_tool) = tools.iter().find(|t| t.name.contains("echo")) {
310 |         let result = client
311 |             .call_tool(CallToolRequestParam {
312 |                 name: echo_tool.name.clone(),
313 |                 arguments: Some(object!({
314 |                     "message": "Testing server capabilities"
315 |                 })),
316 |             })
317 |             .await?;
318 | 
319 |         // Verify the response
320 |         let result_str = format!("{:?}", result);
321 |         assert!(result_str.contains("Testing server capabilities"));
322 |     } else {
323 |         panic!("Echo tool not found");
324 |     }
325 | 
326 |     // Clean up
327 |     drop(client);
328 |     server_handle.kill().await?;
329 | 
330 |     Ok(())
331 | }
332 | 
333 | #[tokio::test]
334 | async fn test_server_info_and_capabilities() -> Result<()> {
335 |     server_info_and_capabilities("echo").await?;
336 |     server_info_and_capabilities("echo_streamable").await?;
337 | 
338 |     Ok(())
339 | }
340 | 
341 | async fn initial_connection_retry(server_name: &str) -> Result<()> {
342 |     // Set up custom logger for this test to clearly see what's happening
343 |     let subscriber = tracing_subscriber::fmt()
344 |         .with_max_level(tracing::Level::INFO)
345 |         .with_test_writer()
346 |         .finish();
347 |     let _guard = tracing::subscriber::set_default(subscriber);
348 | 
349 |     const BIND_ADDRESS: &str = "127.0.0.1:8184";
350 |     let server_url = if server_name == "echo_streamable" {
351 |         format!("http://{}", BIND_ADDRESS)
352 |     } else {
353 |         format!("http://{}/sse", BIND_ADDRESS)
354 |     };
355 |     let bind_addr: SocketAddr = BIND_ADDRESS.parse()?;
356 | 
357 |     // 1. Start the proxy process BEFORE the server
358 |     tracing::info!("Test: Starting proxy process...");
359 |     let (child, mut reader, stderr_reader, mut stdin) =
360 |         spawn_proxy(&server_url, vec!["--initial-retry-interval", "1"]).await?;
361 | 
362 |     let stderr_buffer = collect_stderr(stderr_reader);
363 | 
364 |     // 2. Wait for slightly longer than the proxy's retry delay
365 |     // This ensures the proxy has attempted connection at least once and is retrying.
366 |     let retry_wait = Duration::from_secs(2);
367 |     tracing::info!(
368 |         "Test: Waiting {:?} for proxy to attempt connection...",
369 |         retry_wait
370 |     );
371 |     sleep(retry_wait).await;
372 | 
373 |     // Send initialize message WHILE proxy is still trying to connect
374 |     // (it will be buffered by the OS pipe until proxy reads stdin)
375 |     tracing::info!("Test: Sending initialize request (before server starts)...");
376 |     let init_message = r#"{"jsonrpc":"2.0","id":"init-retry","method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"retry-test","version":"0.1.0"}}}"#;
377 |     stdin.write_all(init_message.as_bytes()).await?;
378 |     stdin.write_all(b"\n").await?;
379 | 
380 |     // 3. Start the SSE server AFTER the wait and AFTER sending init
381 |     tracing::info!("Test: Starting SSE server on {}", BIND_ADDRESS);
382 |     let (server_handle, returned_url) = create_sse_server(server_name, bind_addr).await?;
383 |     assert_eq!(server_url, returned_url, "Server URL mismatch");
384 | 
385 |     let _test_guard = TestGuard::new(child, server_handle, stderr_buffer);
386 | 
387 |     // 4. Proceed with initialization handshake (Proxy should now process buffered init)
388 |     // Read the initialize response (with a timeout)
389 |     tracing::info!("Test: Waiting for initialize response...");
390 |     let mut init_response = String::new();
391 |     match timeout(
392 |         Duration::from_secs(10),
393 |         reader.read_line(&mut init_response),
394 |     )
395 |     .await
396 |     {
397 |         Ok(Ok(_)) => {
398 |             tracing::info!(
399 |                 "Test: Received initialize response: {}",
400 |                 init_response.trim()
401 |             );
402 |             assert!(
403 |                 init_response.contains("\"id\":\"init-retry\""),
404 |                 "Init response missing correct ID"
405 |             );
406 |             assert!(
407 |                 init_response.contains("\"result\""),
408 |                 "Init response missing result"
409 |             );
410 |         }
411 |         Ok(Err(e)) => return Err(anyhow::anyhow!("Error reading init response: {}", e)),
412 |         Err(_) => return Err(anyhow::anyhow!("Timed out waiting for init response")),
413 |     }
414 | 
415 |     tracing::info!("Test: Sending initialized notification...");
416 |     let initialized_message = r#"{"jsonrpc":"2.0","method":"notifications/initialized"}"#;
417 |     stdin.write_all(initialized_message.as_bytes()).await?;
418 |     stdin.write_all(b"\n").await?;
419 | 
420 |     // 5. Test basic functionality (e.g., echo tool call)
421 |     tracing::info!("Test: Sending echo request...");
422 |     let echo_call = r#"{"jsonrpc":"2.0","id":"call-retry","method":"tools/call","params":{"name":"echo","arguments":{"message":"Hello after initial retry!"}}}"#;
423 |     stdin.write_all(echo_call.as_bytes()).await?;
424 |     stdin.write_all(b"\n").await?;
425 | 
426 |     tracing::info!("Test: Waiting for echo response...");
427 |     let mut echo_response = String::new();
428 |     match timeout(Duration::from_secs(5), reader.read_line(&mut echo_response)).await {
429 |         Ok(Ok(_)) => {
430 |             tracing::info!("Test: Received echo response: {}", echo_response.trim());
431 |             assert!(
432 |                 echo_response.contains("\"id\":\"call-retry\""),
433 |                 "Echo response missing correct ID"
434 |             );
435 |             assert!(
436 |                 echo_response.contains("Hello after initial retry!"),
437 |                 "Echo response missing correct message"
438 |             );
439 |         }
440 |         Ok(Err(e)) => return Err(anyhow::anyhow!("Error reading echo response: {}", e)),
441 |         Err(_) => return Err(anyhow::anyhow!("Timed out waiting for echo response")),
442 |     }
443 | 
444 |     tracing::info!("Test: Completed successfully");
445 |     Ok(())
446 | }
447 | 
448 | #[tokio::test]
449 | async fn test_initial_connection_retry() -> Result<()> {
450 |     initial_connection_retry("echo").await?;
451 |     initial_connection_retry("echo_streamable").await?;
452 | 
453 |     Ok(())
454 | }
455 | 
456 | async fn ping_when_disconnected(server_name: &str) -> Result<()> {
457 |     const BIND_ADDRESS: &str = "127.0.0.1:8185";
458 |     let subscriber = tracing_subscriber::fmt()
459 |         .with_max_level(tracing::Level::DEBUG)
460 |         .with_test_writer()
461 |         .finish();
462 |     let _guard = tracing::subscriber::set_default(subscriber);
463 | 
464 |     // 1. Start the SSE server
465 |     tracing::info!("Test: Starting SSE server for ping test");
466 |     let (server_handle, server_url) = create_sse_server(server_name, BIND_ADDRESS.parse()?).await?;
467 | 
468 |     // Create a child process for the proxy
469 |     tracing::info!("Test: Creating proxy process");
470 |     let (child, mut reader, stderr_reader, mut stdin) =
471 |         spawn_proxy(&server_url, vec!["--debug"]).await?;
472 | 
473 |     let stderr_buffer = collect_stderr(stderr_reader);
474 | 
475 |     let mut test_guard = TestGuard::new(child, server_handle, stderr_buffer);
476 | 
477 |     // 2. Initializes everything
478 |     let init_message = r#"{"jsonrpc":"2.0","id":"init-ping","method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"ping-test","version":"0.1.0"}}}"#;
479 |     tracing::info!("Test: Sending initialize request");
480 |     stdin.write_all(init_message.as_bytes()).await?;
481 |     stdin.write_all(b"\n").await?;
482 | 
483 |     // Read the initialize response
484 |     let mut init_response = String::new();
485 |     match timeout(Duration::from_secs(5), reader.read_line(&mut init_response)).await {
486 |         Ok(Ok(_)) => {
487 |             tracing::info!(
488 |                 "Test: Received initialize response: {}",
489 |                 init_response.trim()
490 |             );
491 |             assert!(init_response.contains("\"id\":\"init-ping\""));
492 |         }
493 |         Ok(Err(e)) => panic!("Failed to read init response: {}", e),
494 |         Err(_) => panic!("Timed out waiting for init response"),
495 |     }
496 | 
497 |     // Send initialized notification
498 |     let initialized_message = r#"{"jsonrpc":"2.0","method":"notifications/initialized"}"#;
499 |     tracing::info!("Test: Sending initialized notification");
500 |     stdin.write_all(initialized_message.as_bytes()).await?;
501 |     stdin.write_all(b"\n").await?;
502 |     // Allow time for proxy to process initialized and potentially send buffered msgs (if any)
503 |     sleep(Duration::from_millis(100)).await;
504 | 
505 |     // 3. Kills the SSE server
506 |     tracing::info!("Test: Shutting down SSE server");
507 |     if let Some(mut server) = test_guard.server_handle.take() {
508 |         server.kill().await?;
509 |     }
510 |     // Give the server time to shut down and the proxy time to notice
511 |     sleep(Duration::from_secs(3)).await;
512 | 
513 |     // 4. Sends a ping request
514 |     let ping_message = r#"{"jsonrpc":"2.0","id":"ping-1","method":"ping"}"#;
515 |     tracing::info!("Test: Sending ping request while server is down");
516 |     stdin.write_all(ping_message.as_bytes()).await?;
517 |     stdin.write_all(b"\n").await?;
518 | 
519 |     // 5. Checks that it receives a response
520 |     let mut ping_response = String::new();
521 |     match timeout(Duration::from_secs(2), reader.read_line(&mut ping_response)).await {
522 |         Ok(Ok(_)) => {
523 |             tracing::info!("Test: Received ping response: {}", ping_response.trim());
524 |             // Expecting: {"jsonrpc":"2.0","id":"ping-1","result":{}}
525 |             assert!(
526 |                 ping_response.contains("\"id\":\"ping-1\""),
527 |                 "Response ID mismatch"
528 |             );
529 |             assert!(
530 |                 ping_response.contains("\"result\":{}"),
531 |                 "Expected empty result object"
532 |             );
533 |         }
534 |         Ok(Err(e)) => panic!("Failed to read ping response: {}", e),
535 |         Err(_) => panic!("Timed out waiting for ping response"),
536 |     }
537 | 
538 |     Ok(())
539 | }
540 | 
541 | #[tokio::test]
542 | async fn test_ping_when_disconnected() -> Result<()> {
543 |     ping_when_disconnected("echo").await?;
544 |     ping_when_disconnected("echo_streamable").await?;
545 | 
546 |     Ok(())
547 | }
548 | 


--------------------------------------------------------------------------------
/tests/basic_test.rs:
--------------------------------------------------------------------------------
 1 | mod echo;
 2 | use rmcp::{
 3 |     ServiceExt,
 4 |     transport::{ConfigureCommandExt, SseServer, TokioChildProcess},
 5 | };
 6 | 
 7 | const BIND_ADDRESS: &str = "127.0.0.1:8099";
 8 | const TEST_SERVER_URL: &str = "http://localhost:8099/sse";
 9 | 
10 | #[tokio::test]
11 | async fn test_proxy_connects_to_real_server() -> anyhow::Result<()> {
12 |     let ct = SseServer::serve(BIND_ADDRESS.parse()?)
13 |         .await?
14 |         .with_service(echo::Echo::default);
15 | 
16 |     let transport = TokioChildProcess::new(
17 |         tokio::process::Command::new("./target/debug/mcp-proxy").configure(|cmd| {
18 |             cmd.arg(TEST_SERVER_URL);
19 |         }),
20 |     )?;
21 | 
22 |     let client = ().serve(transport).await?;
23 |     let tools = client.list_all_tools().await?;
24 | 
25 |     // assert that the echo tool is available
26 |     assert!(tools.iter().any(|t| t.name == "echo"));
27 | 
28 |     if let Some(echo_tool) = tools.iter().find(|t| t.name.contains("echo")) {
29 |         let result = client
30 |             .call_tool(rmcp::model::CallToolRequestParam {
31 |                 name: echo_tool.name.clone(),
32 |                 arguments: Some(rmcp::object!({
33 |                     "message": "Hello, world!"
34 |                 })),
35 |             })
36 |             .await?;
37 | 
38 |         // Assert that the result contains our expected text
39 |         let result_debug = format!("{:?}", result);
40 |         assert!(
41 |             result_debug.contains("Hello, world!"),
42 |             "Expected result to contain 'Hello, world!', but got: {}",
43 |             result_debug
44 |         );
45 | 
46 |         println!("Result: {}", result_debug);
47 |     } else {
48 |         assert!(false, "No echo tool found");
49 |     }
50 | 
51 |     // Properly shutdown the client and kill the child process
52 |     drop(client);
53 |     // Wait for the server to shut down
54 |     ct.cancel();
55 | 
56 |     Ok(())
57 | }
58 | 


--------------------------------------------------------------------------------
/tests/echo/mod.rs:
--------------------------------------------------------------------------------
 1 | use rmcp::{
 2 |     ServerHandler,
 3 |     model::{ServerCapabilities, ServerInfo},
 4 |     schemars, tool,
 5 | };
 6 | #[derive(Debug, Clone, Default)]
 7 | pub struct Echo;
 8 | #[tool(tool_box)]
 9 | impl Echo {
10 |     #[tool(description = "Echo a message")]
11 |     fn echo(&self, #[tool(param)] message: String) -> String {
12 |         message
13 |     }
14 | }
15 | 
16 | #[tool(tool_box)]
17 | impl ServerHandler for Echo {
18 |     fn get_info(&self) -> ServerInfo {
19 |         ServerInfo {
20 |             instructions: Some("A simple echo server".into()),
21 |             capabilities: ServerCapabilities::builder().enable_tools().build(),
22 |             ..Default::default()
23 |         }
24 |     }
25 | }
26 | 


--------------------------------------------------------------------------------