wip: early integration

Cargo.lock

@@ -17,6 +17,15 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
 
+[[package]]
+name = "aho-corasick"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b2969dcb958b36655471fc61f7e416fa76033bdd4bfed0678d8fee1e2d07a1f0"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "autocfg"
 version = "1.1.0"
@@ -95,6 +104,12 @@ version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d77f7ec81a6d05a3abb01ab6eb7590f6083d08449fe5a1c8b1e620283546ccb7"
 
+[[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+
 [[package]]
 name = "libc"
 version = "0.2.150"
@@ -223,6 +238,35 @@ dependencies = [
  "bitflags 1.3.2",
 ]
 
+[[package]]
+name = "regex"
+version = "1.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "380b951a9c5e80ddfd6136919eef32310721aa4aacd4889a8d39124b026ab343"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5f804c7828047e88b2d32e2d7fe5a105da8ee3264f01902f796c8e067dc2483f"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c08c74e62047bb2de4ff487b251e4a92e24f48745648451635cec7d591162d9f"
+
 [[package]]
 name = "rustc-demangle"
 version = "0.1.23"
@@ -396,7 +440,9 @@ checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
 name = "wingmate-rs"
 version = "0.1.0"
 dependencies = [
+ "lazy_static",
  "nix",
+ "regex",
  "tokio",
  "tokio-util",
 ]

Cargo.toml

@@ -6,6 +6,8 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+lazy_static = "1.4.0"
 nix = {version = "0.27.1", features = ["process", "signal", "fs"]}
+regex = "1.10.2"
 tokio = { version = "1.34.0", features = ["full"] }
 tokio-util = "0.7.10"

docker/Dockerfile

@@ -1,7 +1,7 @@
 FROM ubuntu:22.04
 
 ADD target/debug/init /usr/local/bin/init
-ADD docker/ /
+ADD docker/etc/ /etc/
 
 RUN chmod ugo+x /etc/wingmate/services/one && chmod ugo+x /etc/wingmate/services/two.sh && \
     chmod ugo-x /etc/wingmate/services/three.sh

docker/etc/wingmate/crontab

@@ -0,0 +1,3 @@
+17 * * * * sleep 1
+*/12 * * * * sleep 1
+12,17,27 * * * * sleep 1

src/bin/init.rs

@@ -4,5 +4,10 @@ use wingmate_rs::init;
 
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn error::Error>> {
-    init::start().await
+    if let Err(e) = init::start().await {
+        eprintln!("{}", e);
+        return Err(e);
+    }
+
+    Ok(())
 }

src/init.rs

@@ -2,10 +2,28 @@ mod daemon;
 mod config;
 pub(crate) mod error;
 
+use std::env;
 use std::error as std_err;
 
 pub async fn start() -> Result<(), Box<dyn std_err::Error>> {
-    let _config = config::Config::find(vec![String::from("/etc/wingmate")])?;
+    let mut vec_search: Vec<String> = Vec::new();
-    dbg!(_config);
+
-    daemon::start().await
+    match env::var("WINGMATE_CONFIG_PATH") {
+        Ok(paths) => {
+            for p in paths.split(':') {
+                vec_search.push(String::from(p));
+            }
+        },
+        Err(e) => {
+            if let env::VarError::NotUnicode(_) = e {
+                return Err(e.into());
+            } else {
+                vec_search.push(String::from("/etc/wingmate"));
+            }
+        }
+    }
+
+    let config = config::Config::find(vec_search)?;
+    dbg!(&config);
+    daemon::start(config).await
 }

src/init/config.rs

@@ -1,8 +1,12 @@
 use std::fs;
+use std::env;
 use std::path::PathBuf;
+use std::io::{BufReader, BufRead};
 use std::error as std_error;
 use crate::init::error as wingmate_error;
 use nix::unistd::{access, AccessFlags};
+use lazy_static::lazy_static;
+use regex::Regex;
 
 #[derive(Debug)]
 pub enum Command {
@@ -10,9 +14,29 @@ pub enum Command {
     Direct(String)
 }
 
+#[derive(Debug)]
+pub enum CronTimeFieldSpec {
+    Any,
+    Exact(u8),
+    MultiOccurrence(Vec<u8>),
+    Every(u8)
+}
+
+#[derive(Debug)]
+pub struct Crontab {
+    pub minute: CronTimeFieldSpec,
+    pub hour: CronTimeFieldSpec,
+    pub day_of_month: CronTimeFieldSpec,
+    pub month: CronTimeFieldSpec,
+    pub day_of_week: CronTimeFieldSpec,
+    pub command: String,
+}
+
 #[derive(Debug)]
 pub struct Config {
     pub services: Vec<Command>,
+    pub cron: Vec<Crontab>,
+    shell_path: Option<String>,
 }
 
 impl Config {
@@ -22,7 +46,8 @@ impl Config {
         }
 
         let mut svc_commands: Vec<Command> = Vec::new();
-        for p in search_path {
+        let mut cron : Vec<Crontab> = Vec::new();
+        'search: for p in search_path {
             let mut buf = PathBuf::new();
             buf.push(p);
             if let Ok(m) = fs::metadata(buf.as_path()) {
@@ -34,22 +59,20 @@ impl Config {
                                 let ep = dirent.path();
                                 if let Ok(_) = access(ep.as_path(), AccessFlags::X_OK) {
                                     // execute directly
-                                    svc_commands.push(Command::Direct(String::from(ep.as_path().to_string_lossy())));
+                                    svc_commands.push(Command::Direct(String::from(ep.to_string_lossy())));
                                 } else {
                                     // call with shell
-                                    svc_commands.push(Command::ShellPrefixed(String::from(ep.as_path().to_string_lossy())));
+                                    svc_commands.push(Command::ShellPrefixed(String::from(ep.to_string_lossy())));
                                 }
                             }
                         }
                     }
 
-                    let cron = buf.join("cron");
+                    cron = Self::read_crontab(&mut buf)?;
-                    if let Ok(cron_iter) = fs::read_dir(cron.as_path()) {
+
-                        for entry in cron_iter {
+                    //TODO: need to include cron in the condition
-                            if let Ok(_dirent) = entry {
+                    if !svc_commands.is_empty() || !cron.is_empty() {
-                                // read the cron file
+                        break 'search;
-                            }
-                        }
                     }
                 } else {
                     // reserve for future use; when we have a centralized config file
@@ -57,11 +80,166 @@ impl Config {
             }
         }
 
-        if svc_commands.is_empty() {
+        if svc_commands.is_empty() && cron.is_empty() {
             return Err(wingmate_error::NoServiceOrCronFoundError.into());
         }
 
-        let config = Config { services: svc_commands };
+        let mut config = Config { 
+            services: svc_commands,
+            cron,
+            shell_path: None,
+        };
+        config.find_shell()?;
+
         Ok(config)
     }
-}
+
+    fn read_crontab(path: &mut PathBuf) -> Result<Vec<Crontab>, Box<dyn std_error::Error>> {
+        lazy_static! {
+            static ref CRON_REGEX: Regex = Regex::new(
+                r"^\s*(?P<minute>\S+)\s+(?P<hour>\S+)\s+(?P<dom>\S+)\s+(?P<month>\S+)\s+(?P<dow>\S+)\s+(?P<command>\S.*\S)\s*$"
+            ).unwrap();
+        }
+
+        let cron_path = path.join("crontab");
+        let mut ret_vec: Vec<Crontab> = Vec::new();
+
+        if let Ok(f) = fs::File::open(cron_path.as_path()) {
+            for line in BufReader::new(f).lines() {
+                if let Ok(l) = line {
+                    let cap = CRON_REGEX.captures(&l).ok_or::<Box<dyn std_error::Error>>(wingmate_error::CronSyntaxError(String::from(&l)).into())?;
+                    
+                    let mut match_str = cap.name("minute").ok_or::<Box<dyn std_error::Error>>(
+                        wingmate_error::CronSyntaxError(format!("cannot capture minute in \"{}\"", &l)).into()
+                    )?;
+                    let minute = Self::to_cron_time_field_spec(&match_str).map_err(|e| { 
+                        Box::new(wingmate_error::CronSyntaxError(format!("failed to parse minute \"{}\" in \"{}\": {}", &match_str.as_str(), &l, e)))
+                    })?;
+    
+                    match_str = cap.name("hour").ok_or::<Box<dyn std_error::Error>>(
+                        wingmate_error::CronSyntaxError(format!("cannot capture hour in \"{}\"", &l)).into()
+                    )?;
+                    let hour = Self::to_cron_time_field_spec(&match_str).map_err(|e| { 
+                        Box::new(wingmate_error::CronSyntaxError(format!("failed to parse hour \"{}\" in \"{}\": {}", &match_str.as_str(), &l, e)))
+                    })?;
+    
+                    match_str = cap.name("dom").ok_or::<Box<dyn std_error::Error>>(
+                        wingmate_error::CronSyntaxError(format!("cannot capture day of month in \"{}\"", &l)).into()
+                    )?;
+                    let dom = Self::to_cron_time_field_spec(&match_str).map_err(|e| {
+                        Box::new(wingmate_error::CronSyntaxError(format!("failed to parse day of month \"{}\" in \"{}\": {}", &match_str.as_str(), &l, e)))
+                    })?;
+    
+                    match_str = cap.name("month").ok_or::<Box<dyn std_error::Error>>(
+                        wingmate_error::CronSyntaxError(format!("cannot capture month in \"{}\"", &l)).into()
+                    )?;
+                    let month = Self::to_cron_time_field_spec(&match_str).map_err(|e| {
+                        Box::new(wingmate_error::CronSyntaxError(format!("failed to parse month \"{}\" in \"{}\": {}", &match_str.as_str(), &l, e)))
+                    })?;
+    
+                    match_str = cap.name("dow").ok_or::<Box<dyn std_error::Error>>(
+                        wingmate_error::CronSyntaxError(format!("cannot capture day of week in \"{}\"", &l)).into()
+                    )?;
+                    let dow = Self::to_cron_time_field_spec(&match_str).map_err(|e| {
+                        Box::new(wingmate_error::CronSyntaxError(format!("failed to parse day of week \"{}\" in \"{}\": {}", &match_str.as_str(), &l, e)))
+                    })?;
+    
+                    match_str = cap.name("command").ok_or::<Box<dyn std_error::Error>>(
+                        wingmate_error::CronSyntaxError(format!("cannot capture command in \"{}\"", &l)).into()
+                    )?;
+    
+                    ret_vec.push(Crontab {
+                        minute,
+                        hour,
+                        day_of_month: dom,
+                        month,
+                        day_of_week: dow,
+                        command: String::from(match_str.as_str())
+                    })
+                }
+            }
+        }
+
+        Ok(ret_vec)
+    }
+
+    fn to_cron_time_field_spec(match_str: &regex::Match) -> Result<CronTimeFieldSpec, Box<dyn std_error::Error>> {
+        let field = match_str.as_str();
+
+        if field == "*" {
+            return Ok(CronTimeFieldSpec::Any);
+        } else if field.starts_with("*/") {
+            let every = field[2..].parse::<u8>()?;
+            return Ok(CronTimeFieldSpec::Every(every));
+        } else if field.contains(",") {
+            let multi: Vec<&str> = field.split(",").collect();
+            let mut multi_occurrence: Vec<u8> = Vec::new();
+
+            for m in multi {
+                let ur = m.parse::<u8>()?;
+                multi_occurrence.push(ur);
+            }
+
+            return Ok(CronTimeFieldSpec::MultiOccurrence(multi_occurrence));
+        } else {
+            let n = field.parse::<u8>()?;
+            return Ok(CronTimeFieldSpec::Exact(n));
+        }
+    }
+
+    fn find_shell(&mut self) -> Result<(), Box<dyn std_error::Error>> {
+
+        let  shell: String;
+        match env::var("WINGMATE_SHELL") {
+            Ok(sh) => {
+                shell = sh;
+            },
+            Err(e) => {
+                match e {
+                    env::VarError::NotPresent => {
+                        shell = String::from("sh");
+                    },
+                    env::VarError::NotUnicode(_) => {
+                        return Err(e.into());
+                    }
+                }
+            }
+        }
+
+        let env_path  = env::var("PATH")?;
+        let vec_path: Vec<&str> = env_path.split(':').collect();
+
+        for p in vec_path {
+            let mut search_path = PathBuf::new();
+            search_path.push(p);
+
+            let shell_path = search_path.join(&shell);
+            if let Ok(_) = fs::metadata(shell_path.as_path()) {
+                self.shell_path = Some(String::from(shell_path.to_string_lossy()));
+                return Ok(());
+            }
+        }
+
+        Err(wingmate_error::ShellNotFoundError(shell).into())
+    }
+
+    pub fn get_service_iter(&self) -> std::slice::Iter<Command> {
+        self.services.iter()
+    }
+
+    pub fn get_shell(&self) -> Option<String> {
+        if let Some(shell) = &self.shell_path {
+            return Some(shell.clone());
+        }
+        None
+    }
+}
+
+impl Clone for Command {
+    fn clone(&self) -> Self {
+        match self {
+            Command::Direct(d) => Command::Direct(String::from(d)),
+            Command::ShellPrefixed(s) => Command::ShellPrefixed(String::from(s))
+        }
+    }
+}

src/init/daemon.rs

@@ -7,8 +7,9 @@ use std::error;
 use tokio::task::JoinSet;
 use tokio_util::sync::CancellationToken;
 use std::sync::{Arc, Mutex};
+use crate::init::config;
 
-pub async fn start() -> Result<(), Box<dyn error::Error>> {
+pub async fn start(cfg: config::Config) -> Result<(), Box<dyn error::Error>> {
     let sync_flag = Arc::new(Mutex::new(false));
     let sig_sync_flag = sync_flag.clone();
 
@@ -24,7 +25,7 @@ pub async fn start() -> Result<(), Box<dyn error::Error>> {
     });
 
     //TODO: start the process starter
-    starter::start_process(&mut set, starter_cancel);
+    starter::start_services(&mut set, &cfg, starter_cancel)?;
 
     //TODO: spawn_blocking for waiter
     set.spawn_blocking(move || {

src/init/daemon/starter.rs

@@ -1,5 +1,5 @@
 use tokio::task::JoinSet;
-use tokio::process::Command;
+use tokio::process::{Command, Child};
 use tokio_util::sync::CancellationToken;
 use tokio::select;
 use tokio::io::Result as tokio_result;
@@ -10,17 +10,33 @@ use std::error;
 use nix::sys::signal::{kill, Signal};
 use nix::errno::Errno;
 use nix::unistd::Pid;
+use crate::init::config;
+use crate::init::error::NoShellAvailableError;
 
 
-pub fn start_process(ts: &mut JoinSet<Result<(), Box<dyn error::Error + Send + Sync>>>, cancel: CancellationToken) {
+pub fn start_services(ts: &mut JoinSet<Result<(), Box<dyn error::Error + Send + Sync>>>, cfg: &config::Config, cancel: CancellationToken)
-    for _j in 0..5 {
+    -> Result<(), Box<dyn error::Error>> {
+
+    for svc_ in cfg.get_service_iter() {
+        let shell: String = cfg.get_shell().ok_or::<Box<dyn error::Error>>(NoShellAvailableError.into())?;
+        let svc = svc_.clone();
+        // if let config::Command::ShellPrefixed(_) = svc {
+        //     shell = cfg.get_shell().ok_or::<Box<dyn error::Error>>(NoShellAvailableError.into())?;
+        // }
         let cancel = cancel.clone();
         ts.spawn(async move {
             'autorestart: loop {
-                let mut child = Command::new("sleep").arg("1")
+                let mut child: Child;
-                    .spawn()
+                let shell = shell.clone();
-                    .expect("failed to spawn");
+                let svc = svc.clone();
-
+                match svc {
+                    config::Command::Direct(c) => {
+                        child = Command::new(c).spawn().expect("change me");
+                    },
+                    config::Command::ShellPrefixed(s) => {
+                        child = Command::new(shell).arg(s).spawn().expect("change me");
+                    } 
+                }
 
                 select! {
                     _ = cancel.cancelled() => {
@@ -64,6 +80,8 @@ pub fn start_process(ts: &mut JoinSet<Result<(), Box<dyn error::Error + Send + S
 
     }
     println!("starter: spawning completed");
+
+    Ok(())
 }
 
 fn result_match(result: tokio_result<ExitStatus>) -> Result<(), Box<dyn error::Error + Send + Sync>> {

src/init/error.rs

@@ -22,4 +22,37 @@ impl fmt::Display for NoServiceOrCronFoundError {
     }
 }
 
-impl error::Error for NoServiceOrCronFoundError {}
+impl error::Error for NoServiceOrCronFoundError {}
+
+#[derive(Debug,Clone)]
+pub struct CronSyntaxError(pub String);
+
+impl fmt::Display for CronSyntaxError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "cron syntax error at: {}", self.0)
+    }
+}
+
+impl error::Error for CronSyntaxError {}
+
+#[derive(Debug,Clone)]
+pub struct ShellNotFoundError(pub String);
+
+impl fmt::Display for ShellNotFoundError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "shell not found: {}", self.0)
+    }
+}
+
+impl error::Error for ShellNotFoundError {}
+
+#[derive(Debug,Clone)]
+pub struct NoShellAvailableError;
+
+impl fmt::Display for NoShellAvailableError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "no shell available")
+    }
+}
+
+impl error::Error for NoShellAvailableError {}