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97 lines
2.9 KiB
97 lines
2.9 KiB
// Copyright (c) 2021-2022 Laurent Pelecq
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//
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// Licensed under the Apache License, Version 2.0
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// <LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0> or the MIT
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// license <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. All files in the project carrying such notice may not be copied,
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// modified, or distributed except according to those terms.
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use std::io::{self, BufRead, BufReader, BufWriter, Write};
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use std::path::Path;
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use std::thread;
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use std::os::unix::net::UnixListener;
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/// Server on a named socket.
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pub struct Server {
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listener: UnixListener,
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communication: Vec<(&'static str, &'static str)>,
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}
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impl Server {
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/// Create a new server on a named socket.
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///
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/// Argument `communication` is an array of pairs. The first item is a list of strings
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/// the server will receive and the second item is the answer.
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pub fn new<P>(
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socket_path: P,
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communication: &[(&'static str, &'static str)],
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) -> io::Result<Self>
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where
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P: AsRef<Path>,
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{
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let listener = UnixListener::bind(socket_path.as_ref())?;
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Ok(Server {
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listener,
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communication: communication.to_vec(),
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})
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}
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fn split_lines(lines: &str) -> Vec<String> {
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lines
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.trim_end()
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.split("\r\n")
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.map(|s| format!("{}\r\n", s))
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.collect::<Vec<String>>()
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}
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pub fn serve(&mut self) -> io::Result<()> {
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let (stream, _) = self.listener.accept()?;
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let mut input = BufReader::new(stream.try_clone()?);
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let mut output = BufWriter::new(stream);
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for (questions, answer) in self.communication.iter() {
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for question in Server::split_lines(questions).iter() {
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let mut line = String::new();
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input.read_line(&mut line)?;
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if line != *question {
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return Err(io::Error::new(
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io::ErrorKind::InvalidInput,
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format!("read <{}> instead of <{}>", line, *question),
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));
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}
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}
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output.write_all(answer.as_bytes())?;
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output.flush()?;
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}
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Ok(())
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}
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pub fn run<P>(
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socket_path: P,
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communication: &'static [(&'static str, &'static str)],
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) -> thread::JoinHandle<io::Result<()>>
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where
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P: AsRef<Path>,
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{
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let server_path = socket_path.as_ref().to_path_buf();
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let mut server = Server::new(&server_path, communication).unwrap();
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thread::spawn(move || -> io::Result<()> {
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server.serve()?;
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Ok(())
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})
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}
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}
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#[cfg(test)]
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mod test {
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use super::Server;
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#[test]
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fn test_split_lines() {
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const ONE_LINE: &str = "one line\r\n";
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let one_line = Server::split_lines(ONE_LINE);
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assert_eq!(&[ONE_LINE], one_line.as_slice());
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}
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}
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