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148 lines
4.3 KiB
148 lines
4.3 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, Read, Write};
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use std::path::Path;
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use std::thread;
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use std::net::{TcpListener, ToSocketAddrs};
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use std::os::unix::net::UnixListener;
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/// Split lines on CRLF
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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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/// Handle the communication for tests.
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///
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/// The communication is a list of (question, answer). If the client sends the expected question
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/// in the sequence, the answer is returned.
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fn serve_streams(
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instream: &mut dyn Read,
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outstream: &mut dyn Write,
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communication: &[(&'static str, &'static str)],
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) -> io::Result<()> {
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let mut input = BufReader::new(instream);
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let mut output = BufWriter::new(outstream);
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for (questions, answer) in communication.iter() {
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for question in 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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/// Server traits
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pub trait Server {
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fn serve(&mut self, communication: &[(&'static str, &'static str)]) -> io::Result<()>;
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}
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/// Server on a named socket.
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pub struct UnixServer {
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listener: UnixListener,
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}
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impl UnixServer {
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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>(socket_path: P) -> 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(Self { listener })
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}
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}
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impl Server for UnixServer {
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fn serve(&mut self, communication: &[(&'static str, &'static str)]) -> io::Result<()> {
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let (mut stream, _) = self.listener.accept()?;
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serve_streams(&mut stream.try_clone()?, &mut stream, communication)
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}
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}
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/// Server on a named socket.
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pub struct TcpServer {
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listener: TcpListener,
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}
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impl TcpServer {
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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<A: ToSocketAddrs>(addr: A) -> io::Result<Self> {
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let listener = TcpListener::bind(addr)?;
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Ok(Self { listener })
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}
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}
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impl Server for TcpServer {
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fn serve(&mut self, communication: &[(&'static str, &'static str)]) -> io::Result<()> {
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let (mut stream, _) = self.listener.accept()?;
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serve_streams(&mut stream.try_clone()?, &mut stream, communication)
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}
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}
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/// Run the server in a thread
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pub fn run_server(
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mut server: Box<dyn Server + Send>,
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communication: &'static [(&'static str, &'static str)],
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) -> thread::JoinHandle<io::Result<()>> {
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thread::spawn(move || -> io::Result<()> {
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server.serve(&communication)?;
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Ok(())
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})
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}
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pub fn run_unix<P>(
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socket_path: P,
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communication: &'static [(&'static str, &'static str)],
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) -> io::Result<thread::JoinHandle<io::Result<()>>>
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where
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P: AsRef<Path>,
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{
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Ok(run_server(
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Box::new(UnixServer::new(&socket_path)?),
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communication,
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))
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}
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pub fn run_tcp<A: ToSocketAddrs>(
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addr: A,
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communication: &'static [(&'static str, &'static str)],
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) -> io::Result<thread::JoinHandle<io::Result<()>>> {
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Ok(run_server(Box::new(TcpServer::new(addr)?), communication))
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}
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#[cfg(test)]
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mod test {
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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 = super::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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