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use serde::{Deserialize, Serialize}; |
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use tokio::{ |
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io::{AsyncBufReadExt, AsyncWriteExt, BufReader}, |
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process::{Child, Command}, |
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sync::{ |
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Mutex, |
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mpsc::{Receiver, channel}, |
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}, |
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task::spawn, |
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}; |
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|
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use std::{path::PathBuf, process::Stdio, sync::Arc}; |
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|
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#[derive(Serialize, Deserialize, Clone, Debug)] |
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pub struct ServiceConf { |
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pub name: String, |
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pub command: String, |
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pub args: Option<String>, |
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pub directory: Option<PathBuf>, |
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pub autostart: bool, |
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} |
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impl Default for ServiceConf { |
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fn default() -> Self { |
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Self::new() |
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} |
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} |
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impl ServiceConf { |
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/** |
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* Returns a new empty `ServiceConf` |
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*/ |
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pub fn new() -> Self { |
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Self { |
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name: String::new(), |
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command: String::new(), |
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args: None, |
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directory: None, |
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autostart: false, |
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} |
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} |
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/** |
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* Returns a new `ServiceConf` from parts. |
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*/ |
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pub fn from_parts( |
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name: String, |
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command: String, |
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args: Option<String>, |
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directory: Option<PathBuf>, |
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autostart: bool, |
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) -> Self { |
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Self { |
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name, |
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command, |
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args, |
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directory, |
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autostart, |
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} |
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} |
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} |
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|
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#[derive(Debug)] |
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pub struct Service { |
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conf: ServiceConf, |
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proc: Option<Arc<Mutex<Child>>>, |
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stdout: Option<Arc<Mutex<Receiver<String>>>>, |
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stderr: Option<Arc<Mutex<Receiver<String>>>>, |
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} |
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impl Default for Service { |
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fn default() -> Self { |
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Self::new() |
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} |
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} |
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impl Service { |
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/** |
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* Returns a new empty `Service` |
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*/ |
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pub fn new() -> Self { |
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Self { |
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conf: ServiceConf::default(), |
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proc: None, |
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stdout: None, |
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stderr: None, |
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} |
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} |
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/** |
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* Returns a `Service` made from a `ServiceConf`. |
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*/ |
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pub fn from_conf(conf: &ServiceConf) -> Self { |
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Self { |
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conf: conf.clone(), |
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proc: None, |
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stdout: None, |
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stderr: None, |
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} |
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} |
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/** |
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* Returns the name of the service |
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*/ |
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pub async fn name(&self) -> &str { |
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&self.conf.name |
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} |
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/** |
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* Uses `tokio::process::Command` to start the service. |
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*/ |
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pub async fn start(&mut self) -> Result<(), Box<dyn std::error::Error>> { |
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if self.proc.is_some() { |
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return Err(Box::new(std::io::Error::new( |
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std::io::ErrorKind::AlreadyExists, |
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"Process Already Exists", |
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))); |
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} |
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let cmd = &self.conf.command; |
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let args = if let Some(a) = &self.conf.args { |
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a.split_whitespace() |
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} else { |
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"".split_whitespace() |
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}; |
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let cwd = if let Some(c) = &self.conf.directory { |
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c |
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} else { |
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&PathBuf::from("/") |
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}; |
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let child = Command::new(cmd) |
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.args(args) |
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.current_dir(cwd) |
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.stdin(Stdio::piped()) |
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.stdout(Stdio::piped()) |
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.stderr(Stdio::piped()) |
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.spawn()?; |
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self.proc = Some(Arc::new(Mutex::new(child))); |
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Ok(()) |
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} |
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/** |
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* Returns true when process is started and false when process is stopped. |
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*/ |
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pub async fn started(&self) -> bool { |
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self.proc.is_some() |
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} |
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/** |
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* Invokes kill on the service process |
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*/ |
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pub async fn stop(&mut self) -> Result<(), Box<dyn std::error::Error>> { |
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if let Some(proc) = self.proc.clone() { |
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let mut lock = proc.lock().await; |
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lock.kill().await?; |
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drop(lock); |
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self.proc = None; |
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Ok(()) |
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} else { |
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Err(Box::new(std::io::Error::new( |
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std::io::ErrorKind::NotFound, |
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"No Process Associated with Service", |
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))) |
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} |
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} |
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/** |
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* Restarts service process |
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*/ |
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pub async fn restart(&mut self) -> Result<(), Box<dyn std::error::Error>> { |
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self.stop().await?; |
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self.start().await?; |
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Ok(()) |
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} |
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/** |
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* Takes control of service process' stdout file handle and spawns a new task to continuously |
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* scan it. |
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*/ |
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pub async fn scan_stdout(&mut self) -> Result<(), Box<dyn std::error::Error>> { |
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if let Some(proc) = self.proc.clone() { |
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let mut lock = proc.lock().await; |
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let stdout = if let Some(stdout) = lock.stdout.take() { |
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stdout |
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} else { |
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return Err(Box::new(std::io::Error::new( |
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std::io::ErrorKind::NotFound, |
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"No stdout handle associated with process", |
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))); |
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}; |
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drop(lock); |
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let (tx, rx) = channel(100); |
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let sname = self.conf.name.clone(); |
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spawn(async move { |
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let mut br = BufReader::new(stdout).lines(); |
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while let Ok(Some(line)) = br.next_line().await { |
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println!("{} :: {}", &sname, &line); |
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if let Err(_) = tx.send(line).await { |
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return; |
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}; |
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} |
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}); |
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self.stdout = Some(Arc::new(Mutex::new(rx))); |
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Ok(()) |
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} else { |
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Err(Box::new(std::io::Error::new( |
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std::io::ErrorKind::NotFound, |
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"No Process Associated with Service", |
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))) |
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} |
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} |
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/** |
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* Takes control of service process' stderr file handle and spawns a new task to continuously |
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* scan it. |
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*/ |
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pub async fn scan_stderr(&mut self) -> Result<(), Box<dyn std::error::Error>> { |
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if let Some(proc) = self.proc.clone() { |
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let mut lock = proc.lock().await; |
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let stderr = if let Some(stderr) = lock.stderr.take() { |
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stderr |
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} else { |
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return Err(Box::new(std::io::Error::new( |
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std::io::ErrorKind::NotFound, |
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"No stderr handle associated with process", |
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))); |
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}; |
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drop(lock); |
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let (tx, rx) = channel(100); |
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let sname = self.conf.name.clone(); |
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spawn(async move { |
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let mut br = BufReader::new(stderr).lines(); |
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while let Ok(Some(line)) = br.next_line().await { |
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println!("ERR :: {} :: {}", &sname, &line); |
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if let Err(_) = tx.send(line).await { |
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return; |
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}; |
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} |
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}); |
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self.stderr = Some(Arc::new(Mutex::new(rx))); |
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Ok(()) |
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} else { |
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Err(Box::new(std::io::Error::new( |
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std::io::ErrorKind::NotFound, |
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"No Process Associated with Service", |
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))) |
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} |
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} |
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/** |
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* Writes to the service process' stdin, if it exists. |
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*/ |
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pub async fn write_stdin(&mut self, buf: String) -> Result<(), Box<dyn std::error::Error>> { |
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if let Some(proc) = self.proc.clone() { |
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let mut lock = proc.lock().await; |
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let stdin = if let Some(stdin) = lock.stdin.as_mut() { |
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stdin |
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} else { |
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return Err(Box::new(std::io::Error::new( |
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std::io::ErrorKind::NotFound, |
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"No stdin handle associated with process", |
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))); |
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}; |
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stdin.write(&buf.as_bytes()).await?; |
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Ok(()) |
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} else { |
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Err(Box::new(std::io::Error::new( |
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std::io::ErrorKind::NotFound, |
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"No Process Associated with Service", |
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))) |
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} |
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} |
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} |
