src/sys/tools/dash-launcher/src/main.rs

// Copyright 2022 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

use anyhow::{self, Context};
use fidl_fuchsia_dash::{LauncherRequest, LauncherRequestStream};
use fuchsia_async as fasync;
use fuchsia_component::server::ServiceFs;
use fuchsia_inspect::{component, health::Reporter};
use fuchsia_zircon as zx;
use futures::prelude::*;
use launch::{launch_with_pty, launch_with_socket};
use tracing::*;

mod launch;
mod socket;

enum IncomingRequest {
    Launcher(LauncherRequestStream),
}

#[fuchsia::main]
async fn main() -> Result<(), anyhow::Error> {
    let mut service_fs = ServiceFs::new_local();

    // Initialize inspect
    inspect_runtime::serve(component::inspector(), &mut service_fs)?;
    component::health().set_starting_up();

    service_fs.dir("svc").add_fidl_service(IncomingRequest::Launcher);

    service_fs.take_and_serve_directory_handle().context("failed to serve outgoing namespace")?;

    component::health().set_ok();
    debug!("Initialized.");

    service_fs
        .for_each_concurrent(None, |IncomingRequest::Launcher(mut stream)| async move {
            while let Some(Ok(request)) = stream.next().await {
                match request {
                    LauncherRequest::LaunchWithPty { moniker, pty, responder } => {
                        let mut result = launch_with_pty(&moniker, pty).await.map(|p| {
                            info!("Launched dash for instance {}", moniker);
                            log_on_process_exit(p);
                        });
                        let _ = responder.send(&mut result);
                    }
                    LauncherRequest::LaunchWithSocket { moniker, socket, responder } => {
                        let mut result = launch_with_socket(&moniker, socket).await.map(|p| {
                            info!("Launched dash for instance {}", moniker);
                            log_on_process_exit(p);
                        });
                        let _ = responder.send(&mut result);
                    }
                }
            }
        })
        .await;

    Ok(())
}

fn log_on_process_exit(process: zx::Process) {
    fasync::Task::spawn(async move {
        let _ = fasync::OnSignals::new(&process, zx::Signals::PROCESS_TERMINATED).await;
        match process.info() {
            Ok(info) => {
                info!("Dash process has terminated (exit code: {})", info.return_code);
            }
            Err(s) => {
                info!("Dash process has terminated (could not get exit code: {})", s);
            }
        }
    })
    .detach();
}