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#![expect(unused_crate_dependencies)]
use std::{
fs::{self, File, OpenOptions},
io::Write,
path::{Path, PathBuf},
time::{Duration, Instant},
};
use clap::Parser;
use eyre::WrapErr;
use eyre::{Context, Result, bail, eyre};
use fs4::fs_std::FileExt;
use tokio::time::sleep;
use crate::{
aclient::{database::ClientSqlite, record::sqlite_store::SqliteStore, settings::Settings},
api::{control::ControlService, history::HistoryService},
daemon::Daemon,
};
pub(crate) mod aclient;
pub(crate) mod api;
pub(crate) mod daemon;
pub(crate) mod events;
pub(crate) mod server;
const DAEMON_VERSION: &str = env!("CARGO_PKG_VERSION");
#[derive(Parser, Debug)]
#[command(infer_subcommands = true)]
enum Cmd {
/// Start the daemon server
Start {
/// Also write daemon logs to the console (useful for debugging)
#[arg(long)]
show_logs: bool,
},
}
#[tokio::main]
async fn main() -> Result<()> {
let settings = Settings::new().wrap_err("could not load client settings")?;
let db_path = PathBuf::from(settings.db_path.as_str());
let record_store_path = PathBuf::from(settings.record_store_path.as_str());
let history_db = ClientSqlite::new(db_path, settings.local_timeout).await?;
let sqlite_store = SqliteStore::new(record_store_path, settings.local_timeout).await?;
match Cmd::parse() {
Cmd::Start { show_logs, .. } => boot(settings, sqlite_store, history_db).await,
}
}
/// Boot the daemon.
///
/// This creates a daemon,
/// starts the gRPC server with services, and runs the event loop.
async fn boot(settings: Settings, store: SqliteStore, history_db: ClientSqlite) -> Result<()> {
let pidfile_path = PathBuf::from(&settings.daemon.pidfile_path);
let _pidfile_guard = PidfileGuard::acquire(&pidfile_path)?;
let mut daemon = Daemon::builder(settings.clone())
.store(store)
.history_db(history_db.clone())
.build()?;
let handle = {
let handle = daemon.handle();
// Spawn signal handler to emit ShutdownRequested on Ctrl+C/SIGTERM
let signal_handle = handle.clone();
tokio::spawn(async move {
shutdown_signal().await;
tracing::info!("received shutdown signal");
signal_handle.shutdown();
});
handle
};
let history_service = HistoryService::new(handle.clone(), history_db).await?;
let control_service = ControlService::new(handle.clone());
server::run_grpc_server(
&settings,
history_service.into_server(),
control_service.into_server(),
handle,
)?;
daemon.run_event_loop().await?;
tracing::info!("daemon shut down complete");
Ok(())
}
/// Wait for a shutdown signal (Ctrl+C or SIGTERM).
#[cfg(unix)]
async fn shutdown_signal() {
let mut term = tokio::signal::unix::signal(tokio::signal::unix::SignalKind::terminate())
.expect("failed to register sigterm handler");
let mut int = tokio::signal::unix::signal(tokio::signal::unix::SignalKind::interrupt())
.expect("failed to register sigint handler");
tokio::select! {
_ = term.recv() => {},
_ = int.recv() => {},
}
}
struct PidfileGuard {
file: File,
}
impl PidfileGuard {
fn acquire(path: &Path) -> Result<Self> {
let mut file = open_lock_file(path)?;
if !file.try_lock_exclusive()? {
bail!(
"daemon already running (pidfile lock busy at {})",
path.display()
);
}
file.set_len(0)
.wrap_err_with(|| format!("could not truncate daemon pidfile {}", path.display()))?;
writeln!(file, "{}", std::process::id())
.and_then(|()| writeln!(file, "{DAEMON_VERSION}"))
.wrap_err_with(|| format!("could not write daemon pidfile {}", path.display()))?;
Ok(Self { file })
}
}
impl Drop for PidfileGuard {
fn drop(&mut self) {
drop(self.file.unlock());
}
}
fn open_lock_file(path: &Path) -> Result<File> {
if let Some(parent) = path.parent() {
fs::create_dir_all(parent)
.wrap_err_with(|| format!("could not create lock directory {}", parent.display()))?;
}
OpenOptions::new()
.read(true)
.write(true)
.create(true)
.truncate(false)
.open(path)
.wrap_err_with(|| format!("could not open lock file {}", path.display()))
}
async fn wait_for_lock(path: &Path, timeout: Duration) -> Result<File> {
const LOCK_POLL: Duration = Duration::from_millis(20);
let file = open_lock_file(path)?;
let start = Instant::now();
loop {
match file.try_lock_exclusive() {
Ok(true) => return Ok(file),
Ok(false) => {
if start.elapsed() >= timeout {
bail!("timed out waiting for lock at {}", path.display());
}
sleep(LOCK_POLL).await;
}
Err(err) => {
return Err(eyre!("could not lock {}: {err}", path.display()));
}
}
}
}
async fn wait_for_pidfile_available(path: &Path, timeout: Duration) -> Result<()> {
let file = wait_for_lock(path, timeout).await?;
file.unlock()
.wrap_err_with(|| format!("failed to unlock {}", path.display()))?;
Ok(())
}
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