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209 lines
6.1 KiB
209 lines
6.1 KiB
use std::sync::{Arc, Mutex};
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use std::net::{TcpListener, TcpStream};
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use std::thread;
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use clap::Parser;
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use std::io::Write;
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use std::io::{self, BufRead};
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use chrono::{DateTime, Utc};
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use std::collections::BTreeMap;
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use serde::{Serialize, Deserialize};
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use std::fs::File;
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/// Represent one single chat user and their network stuff
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struct ChatUser {
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/// user id
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id: u64,
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/// Name of the chat user
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name: String,
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/// TCPStream socket object thingy
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socket: TcpStream,
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}
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impl ChatUser {
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pub fn new(id: u64, name: String, socket: TcpStream) -> Self {
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Self{id, name, socket}
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}
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}
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struct ChatServer {
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config: ConfigArgs,
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user_map: BTreeMap<u64, ChatUser>,
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user_id_counter: u64,
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}
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impl ChatServer {
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pub fn new(config: ConfigArgs) -> Self {
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Self{config, user_map: BTreeMap::new(), user_id_counter: 1}
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}
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pub fn get_user_count(&self) -> usize {
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self.user_map.len()
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}
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/// register a client by creating a ChatUser for it and assigning it a user id
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pub fn register(&mut self, name: String, socket: TcpStream) -> u64 {
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let chat_user = ChatUser::new(self.user_id_counter, name, socket);
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let client_id = chat_user.id;
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self.user_map.insert(chat_user.id, chat_user);
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self.user_id_counter += 1;
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client_id
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}
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pub fn deregister(&mut self, client_id: u64) -> Option<ChatUser> {
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self.user_map.remove(&client_id)
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}
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pub fn send_to_all(&mut self, msg: &str) -> Result<(), ChatError> {
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let now: DateTime<Utc> = Utc::now();
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let time_msg = format!("[{}] {}", now.format("%H:%M:%S"), msg);
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let mut broken_clients = vec![];
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for (user_id, user) in self.user_map.iter_mut() {
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if write!(user.socket, "{}\n", time_msg).is_err() {
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broken_clients.push((*user_id, user.name.clone()));
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}
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}
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// remove users from map
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for (user_id, _) in broken_clients.iter() {
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self.deregister(*user_id);
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}
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// send out the news
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for (_, name) in broken_clients.iter() {
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self.send_to_all(&format!("* {} has left the chat (broken pipe)", name))?;
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}
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Ok(())
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}
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}
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#[derive(Debug)]
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enum ChatError {
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IOError(std::io::Error),
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MutexPoisonError(),
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Protocol(String),
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}
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impl From<std::io::Error> for ChatError {
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fn from(error: std::io::Error) -> Self {
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ChatError::IOError(error)
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}
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}
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impl <'a, T> From<std::sync::PoisonError<std::sync::MutexGuard<'a, T>>> for ChatError {
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fn from(_error: std::sync::PoisonError<std::sync::MutexGuard<'a, T>>) -> Self {
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ChatError::MutexPoisonError()
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}
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}
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fn handle_client(mut stream: TcpStream, server: Arc<Mutex<ChatServer>>, client_id: &mut Option<u64>) -> Result<(), ChatError> {
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let mut writer = stream.try_clone()?;
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let reader = io::BufReader::new(&mut stream);
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let mut lines = reader.lines();
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// greet and recv nick
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write!(writer, "Hello and welcome to RustChat!\nNick: ")?;
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let nick = lines.next().ok_or(ChatError::Protocol(String::from("Could not recv nickname")))??;
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// FIXME: check for nick name uniqueness
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// print joined msg and register at server
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server.lock()?.send_to_all(&format!("* {} has joined the chat", nick))?;
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let curr_users = server.lock()?.get_user_count();
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let users_in_room_msg = if curr_users == 1 { String::from("is 1 user") } else { format!("are {} users", curr_users) };
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write!(writer, "Welcome, {}! You can now start to chat! There {} in the room.\n", nick, users_in_room_msg)?;
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// server.lock()?.borrow_mut().push(ChatUser::new(nick.clone(), writer));
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*client_id = Some(server.lock()?.register(nick.clone(), writer));
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// read lines
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for line in lines {
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let msg_raw = line?;
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if msg_raw.is_empty() {
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continue;
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}
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let msg = format!("<{}> {}", nick, msg_raw);
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server.lock()?.send_to_all(&msg)?;
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println!("{}", msg);
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}
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Ok(())
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}
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fn run_thread(stream: TcpStream, server: Arc<Mutex<ChatServer>>) {
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let mut client_id = None;
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let quit_reason = match handle_client(stream, Arc::clone(&server), &mut client_id) {
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Ok(()) => String::from("Connection closed by user's choice"),
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Err(err) => format!("Client foobar't their thread: {:?}", err),
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};
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if let Some(client_id) = client_id {
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let mut srv = server.lock().unwrap();
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let name = srv.deregister(client_id).map(|client| client.name).unwrap_or("<unknown user>".into());
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let quit_msg = format!("* {} has left the chat ({})", name, quit_reason);
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println!("{}", quit_msg);
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srv.send_to_all(&quit_msg).unwrap();
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} else {
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println!("Client thread terminated before identifying themselves");
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}
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}
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/// Chatserver in RUST!
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#[derive(Parser, Debug)]
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#[clap(about, version, author)]
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struct Args {
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/// Path to config file
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#[clap(short, long, default_value = "config.yaml")]
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config: String,
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/// IP address to bind to
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#[clap(long)]
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host: Option<String>,
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/// Port to run the server on
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#[clap(short, long)]
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port: Option<u16>,
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}
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#[derive(Debug, Serialize, Deserialize)]
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struct ConfigArgs {
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host: String,
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port: u16,
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greeting_msg: String,
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}
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fn main() -> std::io::Result<()> {
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// argument parsing
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let args = Args::parse();
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// read config file
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let config_reader = File::open(args.config).expect("Could not open config file");
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let mut config: ConfigArgs = serde_yaml::from_reader(&config_reader).expect("Could not parse config file");
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if let Some(host) = args.host {
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config.host = host;
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}
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if let Some(port) = args.port {
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config.port = port;
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}
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let binding_host = format!("{}:{}", config.host, config.port);
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println!("Binding to {}", binding_host);
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let listener = TcpListener::bind(binding_host)?;
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let server = Arc::new(Mutex::new(ChatServer::new(config)));
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// accept connections and process them serially
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for stream in listener.incoming() {
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if let Ok(stream) = stream {
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let server_clone = Arc::clone(&server);
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thread::spawn(move || { run_thread(stream, server_clone); });
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}
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}
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Ok(())
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}
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