garnet/bin/pkg_cache/src/main.rs

// Copyright 2018 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.

#![feature(async_await, await_macro, futures_api)]
#![deny(warnings)]

use {
    failure::{Error, ResultExt},
    fidl_fuchsia_io::DirectoryProxy,
    fuchsia_async as fasync,
    fuchsia_component::server::ServiceFs,
    fuchsia_syslog::{self, fx_log_err, fx_log_info},
    futures::{StreamExt, TryFutureExt},
    std::fs::File,
};

mod cache_service;

const SERVER_THREADS: usize = 2;

fn main() -> Result<(), Error> {
    fuchsia_syslog::init_with_tags(&["pkg_cache"]).expect("can't init logger");
    fx_log_info!("starting package cache service");

    let mut executor = fasync::Executor::new().context("error creating executor")?;

    let pkgfs = connect_to_pkgfs_versions().context("error connecting to pkgfs")?;

    let mut fs = ServiceFs::new();
    fs.dir("public").add_fidl_service(move |stream| {
        fx_log_info!("spawning package cache service");
        fasync::spawn(
            cache_service::serve(Clone::clone(&pkgfs), stream)
                .unwrap_or_else(|e| fx_log_err!("failed to spawn {:?}", e)),
        )
    });
    fs.take_and_serve_directory_handle()?;

    let () = executor.run(fs.collect(), SERVER_THREADS);
    Ok(())
}

fn connect_to_pkgfs_versions() -> Result<DirectoryProxy, Error> {
    let f = File::open("/pkgfs/versions")?;
    let chan = fasync::Channel::from_channel(fdio::clone_channel(&f)?)?;
    Ok(DirectoryProxy::new(chan))
}