feat: split into modules

Cargo.lock

@@ -199,18 +199,18 @@ checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.60"
+version = "1.0.66"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dec2b086b7a862cf4de201096214fa870344cf922b2b30c167badb3af3195406"
+checksum = "18fb31db3f9bddb2ea821cde30a9f70117e3f119938b5ee630b7403aa6e2ead9"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.28"
+version = "1.0.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b9ab9c7eadfd8df19006f1cf1a4aed13540ed5cbc047010ece5826e10825488"
+checksum = "50f3b39ccfb720540debaa0164757101c08ecb8d326b15358ce76a62c7e85965"
 dependencies = [
  "proc-macro2",
 ]
@@ -267,15 +267,35 @@ checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
 
 [[package]]
 name = "syn"
-version = "2.0.18"
+version = "2.0.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "32d41677bcbe24c20c52e7c70b0d8db04134c5d1066bf98662e2871ad200ea3e"
+checksum = "b60f673f44a8255b9c8c657daf66a596d435f2da81a555b06dc644d080ba45e0"
 dependencies = [
  "proc-macro2",
  "quote",
  "unicode-ident",
 ]
 
+[[package]]
+name = "thiserror"
+version = "1.0.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "611040a08a0439f8248d1990b111c95baa9c704c805fa1f62104b39655fd7f90"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "090198534930841fab3a5d1bb637cde49e339654e606195f8d9c76eeb081dc96"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "timers"
 version = "0.1.0"
@@ -284,6 +304,7 @@ dependencies = [
  "clap",
  "serde",
  "serde_cbor",
+ "thiserror",
 ]
 
 [[package]]

Cargo.toml

@@ -10,3 +10,4 @@ anyhow = "1.0.71"
 clap = { version = "4.3.4", features = ["derive"] }
 serde = { version = "1.0.164", features = ["derive"] }
 serde_cbor = "0.11.2"
+thiserror = "1.0.44"

src/cli.rs

@@ -0,0 +1,44 @@
+use crate::daemon::{Answer, Command as OtherCommand, AnswerErr};
+use anyhow::{Context, Result};
+use clap::{Parser, Subcommand};
+use std::net::Shutdown;
+use std::os::unix::net::UnixStream;
+
+#[derive(Debug, Parser)]
+#[command(name = "timers")]
+#[command(about = "A advanced timer daemon/cli.", long_about = None)]
+#[command(arg_required_else_help = true)]
+pub struct Cli {
+    #[command(subcommand)]
+    pub command: Command,
+    #[arg(short, long)]
+    #[clap(default_value = "/tmp/timers.socket")]
+    pub socket: String,
+}
+
+#[derive(Debug, Subcommand)]
+pub enum Command {
+    Daemon,
+    Add { name: String, duration_seconds: u64 },
+    List,
+    Remove { name: String },
+}
+
+fn get_stream(socket_path: &String) -> Result<UnixStream> {
+    UnixStream::connect(socket_path)
+        .context(format!("Could not connect to socket {}!", socket_path))
+}
+
+pub fn send_command(socket_path: &String, command: OtherCommand) -> Result<()> {
+    let stream = get_stream(socket_path)?;
+    serde_cbor::to_writer(&stream, &command).context("Could not write command!")?;
+    stream
+        .shutdown(Shutdown::Write)
+        .context("Could not shutdown write!")?;
+    let answer: Result<Answer, AnswerErr> = serde_cbor::from_reader(&stream).context("Could not read answer!")?;
+    match answer {
+        Ok(answer) => println!("{}", answer),
+        Err(err) => println!("Error: {}", err),
+    }
+    Ok(())
+}

src/daemon.rs

@@ -0,0 +1,139 @@
+pub use crate::timer::Timer;
+use anyhow::Context;
+use serde::{Deserialize, Serialize};
+use std::fmt::{Display, Formatter};
+use std::{
+    io::Write,
+    os::unix::net::{UnixListener, UnixStream},
+    thread::sleep,
+    time::Duration,
+};
+
+#[derive(Debug, Serialize, Deserialize)]
+pub enum Command {
+    Add(String, Duration),
+    Remove(String),
+    List,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub enum Answer {
+    Ok,
+    Timers(Vec<Timer>),
+}
+
+impl Display for Answer {
+    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), std::fmt::Error> {
+        match self {
+            Answer::Ok => write!(f, "Ok"),
+            Answer::Timers(timers) => {
+                if timers.is_empty() {
+                    write!(f, "No timers running.")
+                } else {
+                    let strings: Vec<String> =
+                        timers.iter().map(|timer| timer.to_string()).collect();
+                    write!(f, "{}", strings.join("\n"))
+                }
+            }
+        }
+    }
+}
+
+#[derive(Debug, thiserror::Error, Serialize, Deserialize)]
+pub enum AnswerErr {
+    #[error("Timer with name '{}' already exists", .0)]
+    TimerAlreadyExist(String),
+    #[error("No timer with the name '{}' exists", .0)]
+    NoSuchTimer(String),
+}
+
+
+pub struct Daemon {
+    listener: UnixListener,
+    timers: Vec<Timer>,
+}
+
+impl Daemon {
+    pub fn new(socket_path: String) -> 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))?;
+        }
+        let listener = UnixListener::bind(&socket_path)
+            .context(format!("Cannot bind to socket {}!", socket_path))?;
+        Ok(Self {
+            listener,
+            timers: Vec::new(),
+        })
+    }
+
+    fn has_timer(&mut self, name: &String) -> bool {
+        self.timers.iter().any(|other| &other.name == name)
+    }
+
+    fn handle_command(&mut self, command: Command) -> Result<Answer, AnswerErr> {
+        println!("Received command {:?}", command);
+        match command {
+            Command::List => Ok(Answer::Timers(self.timers.to_vec())),
+            Command::Add(name, duration) => {
+                if self.has_timer(&name) {
+                    return Err(AnswerErr::TimerAlreadyExist(name));
+                }
+                let timer = Timer::new(name, duration);
+                self.timers.push(timer);
+                Ok(Answer::Ok)
+            }
+            Command::Remove(name) => {
+                if !self.has_timer(&name) {
+                    return Err(AnswerErr::NoSuchTimer(name));
+                }
+                self.timers = self
+                    .timers
+                    .iter()
+                    .cloned()
+                    .filter(|other| other.name != name)
+                    .collect();
+                Ok(Answer::Ok)
+            }
+        }
+    }
+
+    fn handle_stream(&mut self, mut stream: &UnixStream) -> anyhow::Result<()> {
+        let command = serde_cbor::from_reader(stream).context("Could not read command!")?;
+        let answer = self.handle_command(command);
+        serde_cbor::to_writer(stream, &answer).context("Could not write answer!")?;
+        stream.flush().context("Could not flush stream!")?;
+        Ok(())
+    }
+
+    fn check_timers(&mut self) {
+        self.timers = self
+            .timers
+            .iter()
+            .cloned()
+            .filter(|timer| {
+                let expired = timer.is_expired();
+                if expired {
+                    println!("Timer {} is expired!", timer.name);
+                }
+                !expired
+            })
+            .collect();
+    }
+
+    pub fn run(&mut self) -> anyhow::Result<()> {
+        self.listener
+            .set_nonblocking(true)
+            .context("Could not set listener to non blocking!")?;
+        loop {
+            while let Ok((stream, _)) = self.listener.accept() {
+                if let Err(e) = self.handle_stream(&stream) {
+                    println!("Error while handling stream: {}", e)
+                }
+            }
+            self.check_timers();
+            sleep(Duration::from_millis(100));
+        }
+    }
+}

src/main.rs

@@ -1,286 +1,24 @@
-use crate::cli::{convert_command, send_command, Cli, Commands};
-use crate::daemon::Daemon;
+pub mod cli;
+pub mod daemon;
+pub mod timer;
+
+use std::time::Duration;
+
+use crate::cli::{send_command, Cli, Command as CliCommand};
+use crate::daemon::{Command as DaemonCommand, Daemon};
 use anyhow::Result;
 use clap::Parser;
 
-mod timer {
-    use serde::{Deserialize, Serialize};
-    use std::{
-        fmt::{Display, Formatter},
-        time::{Duration, Instant},
-    };
-    mod approx_instant {
-        use std::time::{Duration, Instant};
-
-        use serde::de::Error;
-        use serde::{Deserialize, Deserializer, Serialize, Serializer};
-
-        pub fn serialize<S>(instant: &Instant, serializer: S) -> Result<S::Ok, S::Error>
-        where
-            S: Serializer,
-        {
-            let duration = instant.elapsed();
-            duration.serialize(serializer)
-        }
-
-        pub fn deserialize<'de, D>(deserializer: D) -> Result<Instant, D::Error>
-        where
-            D: Deserializer<'de>,
-        {
-            let duration = Duration::deserialize(deserializer)?;
-            let now = Instant::now();
-            let instant = now
-                .checked_sub(duration)
-                .ok_or_else(|| Error::custom("Error deserializing instant!"))?;
-            Ok(instant)
-        }
-    }
-
-    #[derive(Debug, Serialize, Deserialize, PartialEq, Eq, Clone)]
-    pub struct Timer {
-        pub name: String,
-        #[serde(with = "approx_instant")]
-        start: Instant,
-        duration: Duration,
-    }
-
-    impl Display for Timer {
-        fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), std::fmt::Error> {
-            write!(
-                f,
-                "{} has {}s remaining.",
-                self.name,
-                self.remaining().as_secs()
-            )
-        }
-    }
-
-    impl Timer {
-        pub fn new(name: String, duration: Duration) -> Timer {
-            Timer {
-                name,
-                start: Instant::now(),
-                duration,
-            }
-        }
-
-        pub fn is_expired(&self) -> bool {
-            return Instant::now() - self.start > self.duration;
-        }
-
-        pub fn remaining(&self) -> Duration {
-            self.duration - (Instant::now() - self.start)
-        }
-    }
-}
-
-mod daemon {
-    use crate::timer::Timer;
-    use anyhow::{Context, Ok, Result};
-    use serde::{Deserialize, Serialize};
-    use std::fmt::{Display, Formatter};
-    use std::result::Result::Ok as ResultOk;
-    use std::{
-        io::Write,
-        os::unix::net::{UnixListener, UnixStream},
-        thread::sleep,
-        time::Duration,
-    };
-    #[derive(Debug, Serialize, Deserialize)]
-    pub enum Command {
-        Add(String, Duration),
-        Remove(String),
-        List,
-    }
-
-    #[derive(Debug, Serialize, Deserialize)]
-    pub enum Answer {
-        Ok,
-        Timers(Vec<Timer>),
-        Err(String),
-    }
-
-    impl Display for Answer {
-        fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), std::fmt::Error> {
-            match self {
-                Answer::Ok => write!(f, "Ok"),
-                Answer::Timers(timers) => {
-                    if timers.is_empty() {
-                        write!(f, "No timers running.")
-                    } else {
-                        let strings: Vec<String> =
-                            timers.iter().map(|timer| timer.to_string()).collect();
-                        write!(f, "{}", strings.join("\n"))
-                    }
-                }
-                Answer::Err(msg) => write!(f, "Error: {}", msg),
-            }
-        }
-    }
-
-    pub struct Daemon {
-        listener: UnixListener,
-        timers: Vec<Timer>,
-    }
-
-    impl Daemon {
-        pub fn new(socket_path: String) -> 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)
-                })?;
-            }
-            let listener = UnixListener::bind(&socket_path)
-                .with_context(|| format!("Cannot bind to socket {}!", socket_path))?;
-            Ok(Self {
-                listener,
-                timers: Vec::new(),
-            })
-        }
-
-        fn has_timer(&mut self, name: &String) -> bool {
-            self.timers
-                .iter()
-                .find(|other| &other.name == name)
-                .is_some()
-        }
-
-        fn handle_command(&mut self, command: Command) -> Answer {
-            println!("Received command {:?}", command);
-            match command {
-                Command::List => Answer::Timers(self.timers.to_vec()),
-                Command::Add(name, duration) => {
-                    if self.has_timer(&name) {
-                        return Answer::Err(format!("Timer with name {} already exists!", name));
-                    }
-                    let timer = Timer::new(name, duration);
-                    self.timers.push(timer);
-                    Answer::Ok
-                }
-                Command::Remove(name) => {
-                    if !self.has_timer(&name) {
-                        return Answer::Err(format!("Timer with name {} does not exist!", name));
-                    }
-                    self.timers = self
-                        .timers
-                        .to_vec()
-                        .into_iter()
-                        .filter(|other| other.name != name)
-                        .collect();
-                    Answer::Ok
-                }
-            }
-        }
-
-        fn handle_stream(&mut self, mut stream: &UnixStream) -> Result<()> {
-            let command = serde_cbor::from_reader(stream).context("Could not read command!")?;
-            let answer = self.handle_command(command);
-            serde_cbor::to_writer(stream, &answer).context("Could not write answer!")?;
-            stream.flush().context("Could not flush stream!")?;
-            Ok(())
-        }
-
-        fn check_timers(&mut self) {
-            self.timers = self
-                .timers
-                .to_vec()
-                .into_iter()
-                .filter(|timer| {
-                    let expired = timer.is_expired();
-                    if expired {
-                        println!("Timer {} is expired!", timer.name);
-                    }
-                    !expired
-                })
-                .collect();
-        }
-
-        pub fn run(&mut self) -> Result<()> {
-            self.listener
-                .set_nonblocking(true)
-                .context("Could not set listener to non blocking!")?;
-            loop {
-                while let ResultOk((stream, _)) = self.listener.accept() {
-                    if let Err(e) = self.handle_stream(&stream) {
-                        println!("Error while handling stream: {}", e)
-                    }
-                }
-                self.check_timers();
-                sleep(Duration::from_millis(100));
-            }
-        }
-    }
-}
-
-mod cli {
-    use std::net::Shutdown;
-    use std::os::unix::net::UnixStream;
-
-    use std::time::Duration;
-
-    use clap::{Parser, Subcommand};
-
-    use anyhow::{Context, Result};
-
-    use crate::daemon::{Answer, Command};
-
-    #[derive(Debug, Parser)]
-    #[command(name = "timers")]
-    #[command(about = "A advanced timer daemon/cli.", long_about = None)]
-    pub struct Cli {
-        #[command(subcommand)]
-        pub command: Commands,
-        #[arg(short, long)]
-        #[clap(default_value = "/tmp/timers.socket")]
-        pub socket: String,
-    }
-
-    #[derive(Debug, Subcommand)]
-    pub enum Commands {
-        Daemon,
-        Add { name: String, duration_seconds: u64 },
-        List,
-        Remove { name: String },
-    }
-
-    fn get_stream(socket_path: &String) -> Result<UnixStream> {
-        UnixStream::connect(socket_path)
-            .with_context(|| format!("Could not connect to socket {}!", socket_path))
-    }
-
-    pub fn convert_command(command: &Commands) -> Command {
-        match command {
-            Commands::Add {
-                name,
-                duration_seconds,
-            } => Command::Add(name.to_string(), Duration::from_secs(*duration_seconds)),
-            Commands::List => Command::List,
-            Commands::Remove { name } => Command::Remove(name.to_string()),
-            _ => panic!("Invalid command!"),
-        }
-    }
-
-    pub fn send_command(socket_path: &String, command: Command) -> Result<()> {
-        let stream = get_stream(socket_path)?;
-        serde_cbor::to_writer(&stream, &command).with_context(|| "Could not write command!")?;
-        stream
-            .shutdown(Shutdown::Write)
-            .context("Could not shutdown write!")?;
-        let answer: Answer =
-            serde_cbor::from_reader(&stream).with_context(|| "Could not read answer!")?;
-        println!("{}", answer);
-        Ok(())
-    }
-}
-
 fn main() -> Result<()> {
     let args = Cli::parse();
-    match args.command {
-        Commands::Daemon => {
-            Daemon::new(args.socket)?.run()?;
-            Ok(())
-        }
-        _ => send_command(&args.socket, convert_command(&args.command)),
-    }
+    let daemon_command = match args.command {
+        CliCommand::Daemon => return Daemon::new(args.socket)?.run(),
+        CliCommand::Add {
+            name,
+            duration_seconds,
+        } => DaemonCommand::Add(name, Duration::from_secs(duration_seconds)),
+        CliCommand::List => DaemonCommand::List,
+        CliCommand::Remove { name } => DaemonCommand::Remove(name),
+    };
+    send_command(&args.socket, daemon_command)
 }

src/timer.rs

@@ -0,0 +1,69 @@
+use serde::{Deserialize, Serialize};
+use std::{
+    fmt::{Display, Formatter},
+    time::{Duration, Instant},
+};
+
+mod approx_instant {
+    use std::time::{Duration, Instant};
+
+    use serde::de::Error;
+    use serde::{Deserialize, Deserializer, Serialize, Serializer};
+
+    pub fn serialize<S>(instant: &Instant, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let duration = instant.elapsed();
+        duration.serialize(serializer)
+    }
+
+    pub fn deserialize<'de, D>(deserializer: D) -> Result<Instant, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let duration = Duration::deserialize(deserializer)?;
+        let now = Instant::now();
+        let instant = now
+            .checked_sub(duration)
+            .ok_or_else(|| Error::custom("Error deserializing instant!"))?;
+        Ok(instant)
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq, Eq, Clone)]
+pub struct Timer {
+    pub name: String,
+    #[serde(with = "approx_instant")]
+    start: Instant,
+    duration: Duration,
+}
+
+impl Display for Timer {
+    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), std::fmt::Error> {
+        write!(
+            f,
+            "{} has {}s remaining.",
+            self.name,
+            self.remaining().as_secs()
+        )
+    }
+}
+
+impl Timer {
+    pub fn new(name: String, duration: Duration) -> Timer {
+        Timer {
+            name,
+            start: Instant::now(),
+            duration,
+        }
+    }
+
+    pub fn is_expired(&self) -> bool {
+        Instant::now() - self.start > self.duration
+    }
+
+    pub fn remaining(&self) -> Duration {
+        self.duration - (Instant::now() - self.start)
+    }
+}