Initial commit
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619
src-tauri/vendor/sacp-tokio/src/acp_agent.rs
vendored
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619
src-tauri/vendor/sacp-tokio/src/acp_agent.rs
vendored
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@@ -0,0 +1,619 @@
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//! Utilities for connecting to ACP agents and proxies.
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//!
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//! This module provides [`AcpAgent`], a convenient wrapper around [`sacp::schema::McpServer`]
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//! that can be parsed from either a command string or JSON configuration.
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use std::path::PathBuf;
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use std::str::FromStr;
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use std::sync::Arc;
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use sacp::{Client, Conductor, Role};
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use tokio::process::Child;
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use tokio_util::compat::{TokioAsyncReadCompatExt, TokioAsyncWriteCompatExt};
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#[cfg(windows)]
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const CREATE_NO_WINDOW: u32 = 0x0800_0000;
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const MAX_STDERR_CAPTURE_BYTES: usize = 1024 * 1024;
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/// Direction of a line being sent or received.
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub enum LineDirection {
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/// Line being sent to the agent (stdin)
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Stdin,
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/// Line being received from the agent (stdout)
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Stdout,
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/// Line being received from the agent (stderr)
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Stderr,
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}
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/// A component representing an external ACP agent running in a separate process.
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///
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/// `AcpAgent` implements the [`sacp::ConnectTo`] trait for spawning and communicating with
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/// external agents or proxies via stdio. It handles process spawning, stream setup, and
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/// byte stream serialization automatically. This is the primary way to connect to agents
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/// that run as separate executables.
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///
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/// This is a wrapper around [`sacp::schema::McpServer`] that provides convenient parsing
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/// from command-line strings or JSON configurations.
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///
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/// # Use Cases
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///
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/// - **External agents**: Connect to agents written in any language (Python, Node.js, Rust, etc.)
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/// - **Proxy chains**: Spawn intermediate proxies that transform or intercept messages
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/// - **Conductor components**: Use with [`sacp_conductor::Conductor`] to build proxy chains
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/// - **Subprocess isolation**: Run potentially untrusted code in a separate process
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///
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/// # Examples
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///
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/// Parse from a command string:
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/// ```
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/// # use sacp_tokio::AcpAgent;
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/// # use std::str::FromStr;
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/// let agent = AcpAgent::from_str("python my_agent.py --verbose").unwrap();
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/// ```
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///
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/// Parse from JSON:
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/// ```
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/// # use sacp_tokio::AcpAgent;
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/// # use std::str::FromStr;
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/// let agent = AcpAgent::from_str(r#"{"type": "stdio", "name": "my-agent", "command": "python", "args": ["my_agent.py"], "env": []}"#).unwrap();
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/// ```
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///
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/// Use as a component to connect to an external agent:
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/// ```ignore
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/// use sacp::{Client, Builder};
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/// use sacp_tokio::AcpAgent;
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/// use std::str::FromStr;
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///
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/// # async fn example() -> Result<(), Box<dyn std::error::Error>> {
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/// let agent = AcpAgent::from_str("python my_agent.py")?;
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///
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/// // The agent process will be spawned automatically when connected
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/// Client.builder()
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/// .connect_to(agent)
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/// .await?
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/// .connect_with(|cx| async move {
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/// // Use the connection to communicate with the agent process
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/// Ok(())
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/// })
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/// .await?;
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/// # Ok(())
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/// # }
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/// ```
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///
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/// [`sacp_conductor::Conductor`]: https://docs.rs/sacp-conductor/latest/sacp_conductor/struct.Conductor.html
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pub struct AcpAgent {
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server: sacp::schema::McpServer,
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debug_callback: Option<Arc<dyn Fn(&str, LineDirection) + Send + Sync + 'static>>,
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}
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impl std::fmt::Debug for AcpAgent {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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f.debug_struct("AcpAgent")
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.field("server", &self.server)
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.field(
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"debug_callback",
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&self.debug_callback.as_ref().map(|_| "..."),
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)
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.finish()
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}
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}
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impl AcpAgent {
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/// Create a new `AcpAgent` from an [`sacp::schema::McpServer`] configuration.
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pub fn new(server: sacp::schema::McpServer) -> Self {
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Self {
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server,
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debug_callback: None,
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}
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}
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/// Create an ACP agent for Zed Industries' Claude Code tool.
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/// Just runs `npx -y @zed-industries/claude-code-acp@latest`.
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pub fn zed_claude_code() -> Self {
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Self::from_str("npx -y @zed-industries/claude-code-acp@latest").expect("valid bash command")
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}
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/// Create an ACP agent for Zed Industries' Codex tool.
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/// Just runs `npx -y @zed-industries/codex-acp@latest`.
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pub fn zed_codex() -> Self {
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Self::from_str("npx -y @zed-industries/codex-acp@latest").expect("valid bash command")
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}
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/// Create an ACP agent for Google's Gemini CLI.
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/// Just runs `npx -y -- @google/gemini-cli@latest --experimental-acp`.
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pub fn google_gemini() -> Self {
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Self::from_str("npx -y -- @google/gemini-cli@latest --experimental-acp")
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.expect("valid bash command")
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}
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/// Get the underlying [`sacp::schema::McpServer`] configuration.
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pub fn server(&self) -> &sacp::schema::McpServer {
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&self.server
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}
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/// Convert into the underlying [`sacp::schema::McpServer`] configuration.
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pub fn into_server(self) -> sacp::schema::McpServer {
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self.server
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}
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/// Add a debug callback that will be invoked for each line sent/received.
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///
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/// The callback receives the line content and the direction (stdin/stdout/stderr).
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/// This is useful for logging, debugging, or monitoring agent communication.
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///
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/// # Example
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///
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/// ```no_run
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/// # use sacp_tokio::{AcpAgent, LineDirection};
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/// # use std::str::FromStr;
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/// let agent = AcpAgent::from_str("python my_agent.py")
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/// .unwrap()
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/// .with_debug(|line, direction| {
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/// eprintln!("{:?}: {}", direction, line);
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/// });
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/// ```
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pub fn with_debug<F>(mut self, callback: F) -> Self
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where
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F: Fn(&str, LineDirection) + Send + Sync + 'static,
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{
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self.debug_callback = Some(Arc::new(callback));
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self
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}
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/// Spawn the process and get stdio streams.
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/// Used internally by the Component trait implementation.
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pub fn spawn_process(
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&self,
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) -> Result<
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(
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tokio::process::ChildStdin,
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tokio::process::ChildStdout,
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tokio::process::ChildStderr,
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Child,
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),
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sacp::Error,
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> {
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match &self.server {
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sacp::schema::McpServer::Stdio(stdio) => {
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let mut cmd = tokio::process::Command::new(&stdio.command);
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cmd.args(&stdio.args);
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for env_var in &stdio.env {
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cmd.env(&env_var.name, &env_var.value);
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}
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#[cfg(windows)]
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{
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cmd.creation_flags(CREATE_NO_WINDOW);
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}
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cmd.stdin(std::process::Stdio::piped())
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.stdout(std::process::Stdio::piped())
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.stderr(std::process::Stdio::piped());
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let mut child = cmd.spawn().map_err(sacp::Error::into_internal_error)?;
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let child_stdin = child
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.stdin
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.take()
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.ok_or_else(|| sacp::util::internal_error("Failed to open stdin"))?;
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let child_stdout = child
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.stdout
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.take()
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.ok_or_else(|| sacp::util::internal_error("Failed to open stdout"))?;
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let child_stderr = child
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.stderr
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.take()
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.ok_or_else(|| sacp::util::internal_error("Failed to open stderr"))?;
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Ok((child_stdin, child_stdout, child_stderr, child))
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}
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sacp::schema::McpServer::Http(_) => Err(sacp::util::internal_error(
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"HTTP transport not yet supported by AcpAgent",
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)),
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sacp::schema::McpServer::Sse(_) => Err(sacp::util::internal_error(
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"SSE transport not yet supported by AcpAgent",
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)),
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_ => Err(sacp::util::internal_error(
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"Unknown MCP server transport type",
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)),
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}
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}
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}
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/// A wrapper around Child that kills the process when dropped.
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struct ChildGuard(Child);
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impl ChildGuard {
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async fn wait(&mut self) -> std::io::Result<std::process::ExitStatus> {
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self.0.wait().await
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}
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}
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impl Drop for ChildGuard {
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fn drop(&mut self) {
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let _ = self.0.start_kill();
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}
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}
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fn append_limited_utf8(output: &mut String, chunk: &str, limit: usize) -> bool {
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output.push_str(chunk);
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if output.len() <= limit {
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return false;
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}
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let mut start = output.len().saturating_sub(limit);
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while start < output.len() && !output.is_char_boundary(start) {
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start += 1;
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}
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output.drain(..start);
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true
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}
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/// Waits for a child process and returns an error if it exits with non-zero status.
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///
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/// The error message includes any stderr output collected by the background task.
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/// When dropped, the child process is killed.
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async fn monitor_child(
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child: Child,
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stderr_rx: tokio::sync::oneshot::Receiver<String>,
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) -> Result<(), sacp::Error> {
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let mut guard = ChildGuard(child);
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// Wait for the child to exit
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let status = guard
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.wait()
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.await
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.map_err(|e| sacp::util::internal_error(format!("Failed to wait for process: {}", e)))?;
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if status.success() {
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Ok(())
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} else {
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// Get stderr content if available
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let stderr = stderr_rx.await.unwrap_or_default();
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let message = if stderr.is_empty() {
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format!("Process exited with {}", status)
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} else {
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format!("Process exited with {}: {}", status, stderr)
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};
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Err(sacp::util::internal_error(message))
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}
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}
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/// Roles that an ACP agent executable can potentially serve.
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pub trait AcpAgentCounterpartRole: Role {}
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impl AcpAgentCounterpartRole for Client {}
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impl AcpAgentCounterpartRole for Conductor {}
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impl<Counterpart: AcpAgentCounterpartRole> sacp::ConnectTo<Counterpart> for AcpAgent {
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async fn connect_to(
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self,
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client: impl sacp::ConnectTo<Counterpart::Counterpart>,
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) -> Result<(), sacp::Error> {
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use futures::AsyncBufReadExt;
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use futures::AsyncWriteExt;
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use futures::StreamExt;
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use futures::io::BufReader;
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let (child_stdin, child_stdout, child_stderr, child) = self.spawn_process()?;
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// Create a channel to collect stderr for error reporting
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let (stderr_tx, stderr_rx) = tokio::sync::oneshot::channel::<String>();
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// Spawn a task to read stderr, optionally calling the debug callback
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let debug_callback = self.debug_callback.clone();
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tokio::spawn(async move {
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let stderr_reader = BufReader::new(child_stderr.compat());
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let mut stderr_lines = stderr_reader.lines();
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let mut collected = String::new();
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let mut truncated = false;
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while let Some(line_result) = stderr_lines.next().await {
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if let Ok(line) = line_result {
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// Call debug callback if present
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if let Some(ref callback) = debug_callback {
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callback(&line, LineDirection::Stderr);
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}
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// Always collect for error reporting
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if !collected.is_empty() {
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truncated |= append_limited_utf8(
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&mut collected,
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"\n",
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MAX_STDERR_CAPTURE_BYTES,
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);
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}
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truncated |=
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append_limited_utf8(&mut collected, &line, MAX_STDERR_CAPTURE_BYTES);
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}
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}
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if truncated {
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let prefix = "[stderr truncated to last 1 MiB]\n";
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let mut marked = String::with_capacity(prefix.len() + collected.len());
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marked.push_str(prefix);
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marked.push_str(&collected);
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collected = marked;
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}
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let _ = stderr_tx.send(collected);
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});
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// Create a future that monitors the child process for early exit
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let child_monitor = monitor_child(child, stderr_rx);
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// Convert stdio to line streams with optional debug inspection
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let incoming_lines = if let Some(callback) = self.debug_callback.clone() {
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Box::pin(
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BufReader::new(child_stdout.compat())
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.lines()
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.inspect(move |result| {
|
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if let Ok(line) = result {
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callback(line, LineDirection::Stdout);
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}
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}),
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)
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as std::pin::Pin<Box<dyn futures::Stream<Item = std::io::Result<String>> + Send>>
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} else {
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Box::pin(BufReader::new(child_stdout.compat()).lines())
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};
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|
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// Create a sink that writes lines (with newlines) to stdin with optional debug logging
|
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let outgoing_sink = if let Some(callback) = self.debug_callback.clone() {
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Box::pin(futures::sink::unfold(
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(child_stdin.compat_write(), callback),
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async move |(mut writer, callback), line: String| {
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callback(&line, LineDirection::Stdin);
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let mut bytes = line.into_bytes();
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bytes.push(b'\n');
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writer.write_all(&bytes).await?;
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Ok::<_, std::io::Error>((writer, callback))
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},
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))
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as std::pin::Pin<Box<dyn futures::Sink<String, Error = std::io::Error> + Send>>
|
||||
} else {
|
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Box::pin(futures::sink::unfold(
|
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child_stdin.compat_write(),
|
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async move |mut writer, line: String| {
|
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let mut bytes = line.into_bytes();
|
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bytes.push(b'\n');
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writer.write_all(&bytes).await?;
|
||||
Ok::<_, std::io::Error>(writer)
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||||
},
|
||||
))
|
||||
};
|
||||
|
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// Race the protocol against child process exit
|
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// If the child exits early (e.g., with an error), we return that error
|
||||
let protocol_future = sacp::ConnectTo::<Counterpart>::connect_to(
|
||||
sacp::Lines::new(outgoing_sink, incoming_lines),
|
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client,
|
||||
);
|
||||
|
||||
tokio::select! {
|
||||
result = protocol_future => result,
|
||||
result = child_monitor => result,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl AcpAgent {
|
||||
/// Create an `AcpAgent` from an iterator of command-line arguments.
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||||
///
|
||||
/// Leading arguments of the form `NAME=value` are parsed as environment variables.
|
||||
/// The first non-env argument is the command, and the rest are arguments.
|
||||
///
|
||||
/// # Example
|
||||
///
|
||||
/// ```
|
||||
/// # use sacp_tokio::AcpAgent;
|
||||
/// let agent = AcpAgent::from_args([
|
||||
/// "RUST_LOG=debug",
|
||||
/// "cargo",
|
||||
/// "run",
|
||||
/// "-p",
|
||||
/// "my-crate",
|
||||
/// ]).unwrap();
|
||||
/// ```
|
||||
pub fn from_args<I, T>(args: I) -> Result<Self, sacp::Error>
|
||||
where
|
||||
I: IntoIterator<Item = T>,
|
||||
T: ToString,
|
||||
{
|
||||
let args: Vec<String> = args.into_iter().map(|s| s.to_string()).collect();
|
||||
|
||||
if args.is_empty() {
|
||||
return Err(sacp::util::internal_error("Arguments cannot be empty"));
|
||||
}
|
||||
|
||||
let mut env = vec![];
|
||||
let mut command_idx = 0;
|
||||
|
||||
// Parse leading FOO=bar arguments as environment variables
|
||||
for (i, arg) in args.iter().enumerate() {
|
||||
if let Some((name, value)) = parse_env_var(arg) {
|
||||
env.push(sacp::schema::EnvVariable::new(name, value));
|
||||
command_idx = i + 1;
|
||||
} else {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if command_idx >= args.len() {
|
||||
return Err(sacp::util::internal_error(
|
||||
"No command found (only environment variables provided)",
|
||||
));
|
||||
}
|
||||
|
||||
let command = PathBuf::from(&args[command_idx]);
|
||||
let cmd_args = args[command_idx + 1..].to_vec();
|
||||
|
||||
// Generate a name from the command
|
||||
let name = command
|
||||
.file_name()
|
||||
.and_then(|n| n.to_str())
|
||||
.unwrap_or("agent")
|
||||
.to_string();
|
||||
|
||||
Ok(AcpAgent {
|
||||
server: sacp::schema::McpServer::Stdio(
|
||||
sacp::schema::McpServerStdio::new(name, command)
|
||||
.args(cmd_args)
|
||||
.env(env),
|
||||
),
|
||||
debug_callback: None,
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
/// Parse a string as an environment variable assignment (NAME=value).
|
||||
/// Returns None if it doesn't match the pattern.
|
||||
fn parse_env_var(s: &str) -> Option<(String, String)> {
|
||||
// Must contain '=' and the part before must be a valid env var name
|
||||
let eq_pos = s.find('=')?;
|
||||
if eq_pos == 0 {
|
||||
return None;
|
||||
}
|
||||
|
||||
let name = &s[..eq_pos];
|
||||
let value = &s[eq_pos + 1..];
|
||||
|
||||
// Env var names must start with a letter or underscore, and contain only
|
||||
// alphanumeric characters and underscores
|
||||
let mut chars = name.chars();
|
||||
let first = chars.next()?;
|
||||
if !first.is_ascii_alphabetic() && first != '_' {
|
||||
return None;
|
||||
}
|
||||
if !chars.all(|c| c.is_ascii_alphanumeric() || c == '_') {
|
||||
return None;
|
||||
}
|
||||
|
||||
Some((name.to_string(), value.to_string()))
|
||||
}
|
||||
|
||||
impl FromStr for AcpAgent {
|
||||
type Err = sacp::Error;
|
||||
|
||||
fn from_str(s: &str) -> Result<Self, Self::Err> {
|
||||
let trimmed = s.trim();
|
||||
|
||||
// If it starts with '{', try to parse as JSON
|
||||
if trimmed.starts_with('{') {
|
||||
let server: sacp::schema::McpServer = serde_json::from_str(trimmed)
|
||||
.map_err(|e| sacp::util::internal_error(format!("Failed to parse JSON: {}", e)))?;
|
||||
return Ok(Self {
|
||||
server,
|
||||
debug_callback: None,
|
||||
});
|
||||
}
|
||||
|
||||
// Otherwise, parse as a command string
|
||||
let parts = shell_words::split(trimmed)
|
||||
.map_err(|e| sacp::util::internal_error(format!("Failed to parse command: {}", e)))?;
|
||||
|
||||
Self::from_args(parts)
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
|
||||
#[test]
|
||||
fn test_parse_simple_command() {
|
||||
let agent = AcpAgent::from_str("python agent.py").unwrap();
|
||||
match agent.server {
|
||||
sacp::schema::McpServer::Stdio(stdio) => {
|
||||
assert_eq!(stdio.name, "python");
|
||||
assert_eq!(stdio.command, PathBuf::from("python"));
|
||||
assert_eq!(stdio.args, vec!["agent.py"]);
|
||||
assert!(stdio.env.is_empty());
|
||||
}
|
||||
_ => panic!("Expected Stdio variant"),
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_parse_command_with_args() {
|
||||
let agent = AcpAgent::from_str("node server.js --port 8080 --verbose").unwrap();
|
||||
match agent.server {
|
||||
sacp::schema::McpServer::Stdio(stdio) => {
|
||||
assert_eq!(stdio.name, "node");
|
||||
assert_eq!(stdio.command, PathBuf::from("node"));
|
||||
assert_eq!(stdio.args, vec!["server.js", "--port", "8080", "--verbose"]);
|
||||
assert!(stdio.env.is_empty());
|
||||
}
|
||||
_ => panic!("Expected Stdio variant"),
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_parse_command_with_quotes() {
|
||||
let agent = AcpAgent::from_str(r#"python "my agent.py" --name "Test Agent""#).unwrap();
|
||||
match agent.server {
|
||||
sacp::schema::McpServer::Stdio(stdio) => {
|
||||
assert_eq!(stdio.name, "python");
|
||||
assert_eq!(stdio.command, PathBuf::from("python"));
|
||||
assert_eq!(stdio.args, vec!["my agent.py", "--name", "Test Agent"]);
|
||||
assert!(stdio.env.is_empty());
|
||||
}
|
||||
_ => panic!("Expected Stdio variant"),
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_parse_json_stdio() {
|
||||
let json = r#"{
|
||||
"type": "stdio",
|
||||
"name": "my-agent",
|
||||
"command": "/usr/bin/python",
|
||||
"args": ["agent.py", "--verbose"],
|
||||
"env": []
|
||||
}"#;
|
||||
let agent = AcpAgent::from_str(json).unwrap();
|
||||
match agent.server {
|
||||
sacp::schema::McpServer::Stdio(stdio) => {
|
||||
assert_eq!(stdio.name, "my-agent");
|
||||
assert_eq!(stdio.command, PathBuf::from("/usr/bin/python"));
|
||||
assert_eq!(stdio.args, vec!["agent.py", "--verbose"]);
|
||||
assert!(stdio.env.is_empty());
|
||||
}
|
||||
_ => panic!("Expected Stdio variant"),
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_parse_json_http() {
|
||||
let json = r#"{
|
||||
"type": "http",
|
||||
"name": "remote-agent",
|
||||
"url": "https://example.com/agent",
|
||||
"headers": []
|
||||
}"#;
|
||||
let agent = AcpAgent::from_str(json).unwrap();
|
||||
match agent.server {
|
||||
sacp::schema::McpServer::Http(http) => {
|
||||
assert_eq!(http.name, "remote-agent");
|
||||
assert_eq!(http.url, "https://example.com/agent");
|
||||
assert!(http.headers.is_empty());
|
||||
}
|
||||
_ => panic!("Expected Http variant"),
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_append_limited_utf8_truncates_ascii() {
|
||||
let mut output = String::new();
|
||||
let truncated = append_limited_utf8(&mut output, "abcdefghij", 6);
|
||||
assert!(truncated);
|
||||
assert_eq!(output, "efghij");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_append_limited_utf8_keeps_char_boundaries() {
|
||||
let mut output = String::new();
|
||||
let truncated = append_limited_utf8(&mut output, "A中文B", 5);
|
||||
assert!(truncated);
|
||||
assert_eq!(output, "文B");
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user