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// -*- coding: utf-8 -*-
//
// Copyright (C) 2024 Michael Büsch <m@bues.ch>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
//
// SPDX-License-Identifier: GPL-2.0-or-later
#![forbid(unsafe_code)]
mod refresh;
mod systemd;
use crate::{refresh::refresh_feeds, systemd::systemd_notify_ready};
use anyhow::{self as ah, format_err as err, Context as _};
use clap::Parser;
use feedsdb::{Db, DEBUG};
use std::{fs::OpenOptions, io::Write as _, num::NonZeroUsize, sync::Arc, time::Duration};
use tokio::{
runtime,
signal::unix::{signal, SignalKind},
sync, task,
};
/// Create the PID-file in the /run subdirectory.
fn make_pidfile() -> ah::Result<()> {
OpenOptions::new()
.write(true)
.create(true)
.truncate(true)
.open("/run/feedsd/feedsd.pid")
.context("Open PID-file")?
.write_all(format!("{}\n", std::process::id()).as_bytes())
.context("Write to PID-file")
}
#[derive(Parser, Debug, Clone)]
struct Opts {
/// The name of the database to use.
#[arg(long, default_value = "feeds")]
db: String,
/// Set the number async worker threads.
#[arg(long, default_value = "4")]
worker_threads: NonZeroUsize,
/// Feed refresh interval, in seconds.
#[arg(long, default_value = "600")]
refresh_interval: u64,
/// Do not create `/run/feedsd/feedsd.pid`.
#[arg(long)]
no_pidfile: bool,
}
impl Opts {
pub fn refresh_interval(&self) -> Duration {
Duration::from_secs(self.refresh_interval)
}
}
#[must_use]
async fn do_refresh(db: Arc<Db>, opts: &Opts) -> (bool, Duration) {
if DEBUG {
eprintln!("Refreshing...");
}
match refresh_feeds(db, opts.refresh_interval()).await {
Err(e) => {
eprintln!("ERROR: {e:?}");
(false, Duration::from_secs(60))
}
Ok(sleep_dur) => {
if DEBUG {
eprintln!("Refreshed. Sleeping {sleep_dur:?}.");
}
(true, sleep_dur)
}
}
}
async fn async_main(opts: Opts) -> ah::Result<()> {
let opts = Arc::new(opts);
// Create pid-file in /run.
if !opts.no_pidfile {
make_pidfile()?;
}
// Register unix signal handlers.
let mut sigterm = signal(SignalKind::terminate()).unwrap();
let mut sigint = signal(SignalKind::interrupt()).unwrap();
let mut sighup = signal(SignalKind::hangup()).unwrap();
// Create async IPC channels.
let (exit_sock_tx, mut exit_sock_rx) = sync::mpsc::channel(1);
// Create the database access object.
let db = Arc::new(Db::new(&opts.db).await.context("Database")?);
// Initialize the database, if not already done.
db.open()
.await
.context("Open database")?
.init()
.await
.context("Initialize database")?;
// Ready-signal to systemd.
systemd_notify_ready().context("Notify systemd")?;
// Vacuum the database.
db.open()
.await
.context("Open database")?
.vacuum()
.await
.context("Vacuum database")?;
// Task: DB refresher.
task::spawn({
let db = Arc::clone(&db);
let opts = Arc::clone(&opts);
async move {
let mut err_count = 0_u32;
loop {
let (ok, sleep_dur) = do_refresh(Arc::clone(&db), &opts).await;
if ok {
err_count = err_count.saturating_sub(1);
} else {
err_count = err_count.saturating_add(3);
if err_count >= 9 {
let e = Err(err!("Too many errors. Bailing to systemd."));
let _ = exit_sock_tx.send(e).await;
break;
}
}
tokio::time::sleep(sleep_dur).await;
}
}
});
// Task: Main loop.
let exitcode;
loop {
tokio::select! {
_ = sigterm.recv() => {
eprintln!("SIGTERM: Terminating.");
exitcode = Ok(());
break;
}
_ = sigint.recv() => {
exitcode = Err(err!("Interrupted by SIGINT."));
break;
}
_ = sighup.recv() => {
println!("SIGHUP: Triggering database refresh.");
let _ = do_refresh(Arc::clone(&db), &opts).await;
}
code = exit_sock_rx.recv() => {
exitcode = code.unwrap_or_else(|| Err(err!("Unknown error code.")));
break;
}
}
}
exitcode
}
fn main() -> ah::Result<()> {
let opts = Opts::parse();
runtime::Builder::new_multi_thread()
.worker_threads(opts.worker_threads.into())
.max_blocking_threads(opts.worker_threads.into()) // one blocking per worker.
.thread_keep_alive(Duration::from_secs(10))
.enable_all()
.build()
.context("Tokio runtime builder")?
.block_on(async_main(opts))
}
// vim: ts=4 sw=4 expandtab
|
