unshell/examples/protocol/remote_shell_receive.rs

#[path = "support/remote_shell_common.rs"]
mod common;

use std::error::Error;
use std::net::TcpListener;

use unshell::protocol::tree::{Endpoint, Ingress, LocalEvent};

fn main() -> Result<(), Box<dyn Error>> {
    let listener = TcpListener::bind(common::LISTEN_ADDR)?;
    println!("listening on {}", common::LISTEN_ADDR);

    let (mut stream, peer_addr) = listener.accept()?;
    println!("accepted endpoint connection from {peer_addr}");

    let frame_rx = common::spawn_frame_reader(stream.try_clone()?);
    let mut endpoint = common::build_controller_endpoint();
    let hook_id = endpoint.allocate_hook_id();
    let shell_leaf_name = common::shell_leaf_name();
    let open_procedure = common::shell_open_procedure();

    let outcome = endpoint.send_call(
        common::agent_path(),
        Some(shell_leaf_name),
        open_procedure.clone(),
        Some(hook_id),
        common::shell_open_payload(),
    )?;
    common::write_frames(
        &mut stream,
        &outcome
            .forward
            .into_iter()
            .map(|(_, frame)| frame)
            .collect::<Vec<_>>(),
    )?;

    for (index, command) in ["pwd\n", "whoami\n", "exit\n"].iter().enumerate() {
        let outcome = endpoint.send_data(
            common::agent_path(),
            hook_id,
            open_procedure.clone(),
            command.as_bytes().to_vec(),
            index == 2,
        )?;
        common::write_frames(
            &mut stream,
            &outcome
                .forward
                .into_iter()
                .map(|(_, frame)| frame)
                .collect::<Vec<_>>(),
        )?;
    }

    for result in frame_rx {
        let frame = result?;
        let outcome = endpoint.receive(&Ingress::Child(common::agent_path()), frame)?;
        let Some(event) = outcome.event else {
            continue;
        };

        match event {
            LocalEvent::Data { message, .. } => {
                print!("{}", String::from_utf8_lossy(&message.data));

                if message.end_hook {
                    break;
                }
            }
            LocalEvent::Fault { message, .. } => {
                eprintln!("received protocol fault: 0x{:02X}", message.fault.0);
                break;
            }
            LocalEvent::Call { .. } => {}
        }
    }

    Ok(())
}