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use std::io::prelude::*; use std::io::{self, BufReader, BufWriter}; use std::net::{TcpStream}; pub struct LxiDevice { addr: (String, u16), stream: Option<LxiStream>, } struct LxiStream { inp: BufReader<TcpStream>, out: BufWriter<TcpStream>, } impl LxiDevice { pub fn new(addr: (String, u16)) -> Self { Self { addr, stream: None } } pub fn address(&self) -> (&str, u16) { (self.addr.0.as_str(), self.addr.1) } pub fn is_connected(&self) -> bool { self.stream.is_some() } pub fn connect(&mut self) -> io::Result<()> { if self.is_connected() { return Err(io::ErrorKind::AlreadyExists.into()) } let stream = TcpStream::connect(self.address())?; let inp = BufReader::new(stream.try_clone()?); let out = BufWriter::new(stream); self.stream = Some(LxiStream { inp, out }); Ok(()) } pub fn disconnect(&mut self) -> io::Result<()> { if !self.is_connected() { return Err(io::ErrorKind::NotConnected.into()) } self.stream = None; Ok(()) } pub fn reconnect(&mut self) -> io::Result<()> { self.disconnect() .and_then(|()| self.connect()) } pub fn send(&mut self, text: &str) -> io::Result<()> { self.stream.as_mut().ok_or(io::ErrorKind::NotConnected.into()) .and_then(|stream| stream.send(text)) } pub fn receive(&mut self) -> io::Result<String> { self.stream.as_mut().ok_or(io::ErrorKind::NotConnected.into()) .and_then(|stream| stream.receive()) } pub fn request(&mut self, text: &str) -> io::Result<String> { self.stream.as_mut().ok_or(io::ErrorKind::NotConnected.into()) .and_then(|stream| stream.request(text)) } } impl LxiStream { fn send(&mut self, text: &str) -> io::Result<()> { self.out.write_all(text.as_bytes()) .and_then(|()| self.out.write_all(b"\r\n")) .and_then(|()| self.out.flush()) } fn receive(&mut self) -> io::Result<String> { let mut buf = Vec::new(); self.inp.read_until(b'\n', &mut buf) .and_then(|_num| { let mut text = String::from_utf8_lossy(&buf).into_owned(); remove_newline(&mut text); Ok(text) }) } fn request(&mut self, text: &str) -> io::Result<String> { self.send(text) .and_then(|()| self.receive()) } } fn remove_newline(text: &mut String) { match text.pop() { Some('\n') => match text.pop() { Some('\r') => (), Some(c) => text.push(c), None => (), }, Some(c) => text.push(c), None => (), } } #[cfg(test)] mod emul; #[cfg(test)] mod tests { use super::*; use std::thread; use std::time::{Duration}; use emul::{Emulator}; #[test] fn idn() { let e = Emulator::new(("localhost", 0)).unwrap(); let p = e.address().unwrap().port(); let e = e.run(); thread::sleep(Duration::from_millis(100)); { let mut d = LxiDevice::new((String::from("localhost"), p)); d.connect().unwrap(); assert_eq!(d.request(&"*IDN?").unwrap(), "Emulator"); } e.join().unwrap().unwrap(); } }