feat!: implement own pid file + signal handling

Cargo.lock

@@ -345,15 +345,6 @@ dependencies = [
  "typenum",
 ]
 
-[[package]]
-name = "daemonize"
-version = "0.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ab8bfdaacb3c887a54d41bdf48d3af8873b3f5566469f8ba21b92057509f116e"
-dependencies = [
- "libc",
-]
-
 [[package]]
 name = "derivative"
 version = "2.2.0"
@@ -621,9 +612,9 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.146"
+version = "0.2.147"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f92be4933c13fd498862a9e02a3055f8a8d9c039ce33db97306fd5a6caa7f29b"
+checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
 
 [[package]]
 name = "linux-raw-sys"
@@ -1132,11 +1123,12 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "clap",
- "daemonize",
  "humantime",
+ "libc",
  "notify-rust",
  "serde",
  "serde_cbor",
+ "signal-hook",
  "thiserror",
 ]
 

Cargo.toml

@@ -8,9 +8,10 @@ edition = "2021"
 [dependencies]
 anyhow = "1.0.71"
 clap = { version = "4.3.4", features = ["derive"] }
-daemonize = "0.5.0"
 humantime = "2.1.0"
+libc = "0.2.147"
 notify-rust = "4.8.0"
 serde = { version = "1.0.164", features = ["derive"] }
 serde_cbor = "0.11.2"
+signal-hook = "0.3.17"
 thiserror = "1.0.44"

src/cli.rs

@@ -1,4 +1,5 @@
 use crate::daemon::{Answer, AnswerErr, Command as OtherCommand};
+use crate::run_path;
 use anyhow::{Context, Result};
 use clap::{Parser, Subcommand};
 use std::net::Shutdown;
@@ -12,7 +13,7 @@ pub struct Cli {
     #[command(subcommand)]
     pub command: Command,
     #[arg(short, long)]
-    #[clap(default_value = "/tmp/timers.socket")]
+    #[clap(default_value_t = format!("{}/timers.socket", run_path()))]
     pub socket: String,
 }
 
@@ -24,6 +25,9 @@ pub enum Command {
         /// do not send notifications
         #[arg(short, long)]
         no_notify: bool,
+        #[arg(short, long)]
+        #[clap(default_value_t = format!("{}/timers.pid", run_path()))]
+        pid_file: String,
     },
     /// Add a timer
     #[clap(visible_alias = "a")]

src/daemon.rs

@@ -4,6 +4,10 @@ pub use crate::timer::Timer;
 use anyhow::Context;
 use serde::{Deserialize, Serialize};
 use std::fmt::{Display, Formatter};
+use std::fs::File;
+use std::path::Path;
+use std::sync::Arc;
+use std::sync::atomic::{AtomicBool, Ordering};
 use std::{
     io::Write,
     os::unix::net::{UnixListener, UnixStream},
@@ -63,22 +67,41 @@ pub enum AnswerErr {
 }
 
 pub struct Daemon {
+    socket_path: Box<Path>,
+    pid_file_path: Box<Path>,
     listener: UnixListener,
     timers: Vec<Timer>,
     pomodoro: Option<Pomodoro>,
     notify: bool,
 }
 
-impl Daemon {
-    pub fn new(socket_path: String, no_notify: bool) -> anyhow::Result<Self> {
-        let path = std::path::Path::new(&socket_path);
-        if path.exists() {
-            std::fs::remove_file(path)
-                .with_context(|| format!("Could not remove previous socket {}!", socket_path))?;
+#[derive(Debug, thiserror::Error)]
+pub enum DaemonErr {
+    #[error("Daemon already running!")]
+    AlreadyRunning,
 }
-        let listener = UnixListener::bind(&socket_path)
-            .context(format!("Cannot bind to socket {}!", socket_path))?;
+
+impl Daemon {
+    pub fn new(socket: String, pid_file: String, no_notify: bool) -> anyhow::Result<Self> {
+        let pid_file_path = std::path::Path::new(&pid_file);
+        if pid_file_path.exists() {
+            return Err(DaemonErr::AlreadyRunning)?;
+        };
+        let mut pid_file = File::create(pid_file_path)
+            .with_context(|| format!("Could not create pid file at {}!", pid_file))?;
+        write!(pid_file, "{}", std::process::id()).context("Could not write pid to file!")?;
+
+        let socket_path = std::path::Path::new(&socket);
+        if socket_path.exists() {
+            std::fs::remove_file(socket_path)
+                .with_context(|| format!("Could not remove previous socket {}!", socket))?;
+        }
+        let listener =
+            UnixListener::bind(&socket).context(format!("Cannot bind to socket {}!", socket))?;
+
         Ok(Self {
+            socket_path: socket_path.into(),
+            pid_file_path: pid_file_path.into(),
             listener,
             timers: Vec::new(),
             pomodoro: None,
@@ -168,7 +191,12 @@ impl Daemon {
         self.listener
             .set_nonblocking(true)
             .context("Could not set listener to non blocking!")?;
-        loop {
+
+        let term = Arc::new(AtomicBool::new(false));
+        for sig in signal_hook::consts::TERM_SIGNALS {
+            signal_hook::flag::register(*sig, Arc::clone(&term))?;
+        }
+        while !term.load(Ordering::Relaxed) {
             while let Ok((stream, _)) = self.listener.accept() {
                 if let Err(e) = self.handle_stream(&stream) {
                     println!("Error while handling stream: {}", e)
@@ -176,6 +204,20 @@ impl Daemon {
             }
             self.check_timers();
             sleep(Duration::from_millis(100));
+        };
+        Ok(())
     }
 }
+
+impl Drop for Daemon {
+    fn drop(&mut self) {
+        println!("Stopping...");
+        if let Err(err) = std::fs::remove_file(self.socket_path.as_ref()) {
+            eprintln!("Error removing socket: {}", err)
+        };
+        if let Err(err) = std::fs::remove_file(self.pid_file_path.as_ref()) {
+            eprintln!("Error removing pid file: {}", err)
+        };
+        println!("Stopped successfully!");
+    }
 }

src/helper.rs

@@ -0,0 +1,7 @@
+pub fn getuid() -> u32 {
+    unsafe { libc::getuid() }
+}
+
+pub fn run_path() -> String {
+    format!("/run/user/{}", getuid())
+}

src/main.rs

@@ -1,20 +1,21 @@
 mod cli;
 mod daemon;
+mod helper;
 mod notification;
 mod pomodoro;
 mod timer;
 
 use crate::cli::{send_command, Cli, Command as CliCommand};
 use crate::daemon::{Command as DaemonCommand, Daemon};
+use crate::helper::run_path;
 use clap::Parser;
 use cli::PomodoroCommand;
 
 fn main() -> Result<(), anyhow::Error> {
     let args = Cli::parse();
     let daemon_command = match args.command {
-        CliCommand::Daemon { no_notify } => {
-            daemonize::Daemonize::new().start()?;
-            return Daemon::new(args.socket, no_notify)?.run();
+        CliCommand::Daemon { no_notify, pid_file } => {
+            return Daemon::new(args.socket, pid_file, no_notify)?.run();
         }
         CliCommand::Add { name, duration } => {
             DaemonCommand::Add(name.into_boxed_str(), duration.into())