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#![feature(external_doc)]
#![deny(missing_docs)]
#![doc(include = "../README.md")]
#[macro_use]
extern crate log;
use std::fs;
use std::io;
use std::io::Error as IoError;
use std::os::unix::net::{UnixListener, UnixStream};
use std::path::PathBuf;
use std::sync::{mpsc, Arc, RwLock};
use std::thread;
#[derive(Debug, Clone)]
pub enum State {
Closed = 0x00,
Listening = 0x01,
ShouldQuit = 0x02,
}
#[derive(Debug, Clone)]
pub enum Message {
ChangeState(State),
}
pub struct UnixDomainSocket {
path: PathBuf,
state: Arc<RwLock<State>>,
tx: mpsc::Sender<Message>,
rx: mpsc::Receiver<Message>,
}
impl UnixDomainSocket {
pub fn new(path: PathBuf) -> Self {
let state = State::Closed;
let state = RwLock::new(state);
let state = Arc::new(state);
let (tx, rx) = mpsc::channel();
UnixDomainSocket {
path,
state,
tx,
rx,
}
}
pub fn get_state(&self) -> Result<State, IoError> {
self.state
.read()
.map_err(|e| IoError::new(io::ErrorKind::Other, e.to_string()))
.and_then(|state| Ok(state.clone()))
}
pub fn set_state(&self, state: State) -> Result<(), IoError> {
self.state
.write()
.map_err(|e| IoError::new(io::ErrorKind::Other, e.to_string()))
.and_then(|mut self_state| Ok(*self_state = state))
}
pub fn is_listening(&self) -> Result<bool, IoError> {
self.get_state().and_then(|state| Ok(state as u8 == 0x01))
}
pub fn receive_message(&self, message: Message) -> Result<(), IoError> {
match message {
Message::ChangeState(state) => self.set_state(state),
}
}
pub fn bind<F>(&self, handler: F) -> Result<(), IoError>
where
F: FnOnce(UnixStream, mpsc::Sender<Message>),
F: Send + 'static,
F: Copy + 'static,
{
if self.path.as_path().exists() {
fs::remove_file(self.path.as_path())?;
}
let path = self
.path
.to_str()
.map(|p| Ok(p))
.unwrap_or(Err(IoError::new(
io::ErrorKind::Other,
"Invalid path returned by the buffer",
)))?;
UnixListener::bind(path).and_then(|listener| {
info!("UnixDomainSocket bound on {}", path);
self.set_state(State::Listening)?;
for socket in listener.incoming() {
let tx = self.tx.clone();
socket
.and_then(|s| Ok(thread::spawn(move || handler(s, tx))))
.map(|_| ())
.map_err(|e| error!("{}", e))
.unwrap_or(());
for msg in self.rx.try_iter() {
self.receive_message(msg)?;
}
if !self.is_listening()? {
break;
}
debug!("Thread spawned");
}
Ok(info!("UnixDomainSocket closed"))
})
}
}
impl<T: ToString> From<T> for UnixDomainSocket {
fn from(path: T) -> Self {
let path = PathBuf::from(path.to_string());
UnixDomainSocket::new(path)
}
}