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|
use std::{
collections::HashMap,
thread::{self, sleep},
time::Duration,
};
use bevy::{
app::{AppExit, ScheduleRunnerPlugin},
log::LogPlugin,
prelude::{info, warn, App, Commands, CoreStage, EventReader, EventWriter, Res, ResMut},
};
use bevy_quinnet::{
client::{Client, ClientConfigurationData, QuinnetClientPlugin},
ClientId,
};
use chat_protocol::{ClientMessage, ServerMessage};
use rand::{distributions::Alphanumeric, Rng};
use tokio::sync::mpsc;
#[path = "../chat_protocol/lib.rs"] // Because we can't have a shared lib between Cargo examples
mod chat_protocol;
#[derive(Debug, Clone, Default)]
struct Users {
self_id: ClientId,
names: HashMap<ClientId, String>,
}
pub fn on_app_exit(app_exit_events: EventReader<AppExit>, client: Res<Client>) {
if !app_exit_events.is_empty() {
client.send_message(ClientMessage::Disconnect {}).unwrap();
// TODO Clean: event to let the async client send his last messages.
sleep(Duration::from_secs_f32(0.1));
}
}
fn handle_server_messages(mut client: ResMut<Client>, mut users: ResMut<Users>) {
while let Ok(Some(message)) = client.receive_message::<ServerMessage>() {
match message {
ServerMessage::ClientConnected {
client_id,
username,
} => {
info!("{} joined", username);
users.names.insert(client_id, username);
}
ServerMessage::ClientDisconnected { client_id } => {
if let Some(username) = users.names.remove(&client_id) {
println!("{} left", username);
} else {
warn!("ClientDisconnected for an unknown client_id: {}", client_id)
}
}
ServerMessage::ChatMessage { client_id, message } => {
if let Some(username) = users.names.get(&client_id) {
if client_id != users.self_id {
println!("{}: {}", username, message);
}
} else {
warn!("Chat message from an unknown client_id: {}", client_id)
}
}
ServerMessage::InitClient {
client_id,
usernames,
} => {
users.self_id = client_id;
users.names = usernames;
}
}
}
}
fn handle_terminal_messages(
client: ResMut<Client>,
mut terminal_messages: ResMut<mpsc::Receiver<String>>,
mut app_exit_events: EventWriter<AppExit>,
) {
while let Ok(message) = terminal_messages.try_recv() {
if message == "quit" {
app_exit_events.send(AppExit);
} else {
client
.send_message(ClientMessage::ChatMessage { message: message })
.expect("Failed to send chat message");
}
}
}
fn start_terminal_listener(mut commands: Commands) {
let (from_terminal_sender, from_terminal_receiver) = mpsc::channel::<String>(100);
thread::spawn(move || loop {
let mut buffer = String::new();
std::io::stdin().read_line(&mut buffer).unwrap();
from_terminal_sender
.try_send(buffer.trim_end().to_string())
.unwrap();
});
commands.insert_resource(from_terminal_receiver);
}
fn start_connection(client: ResMut<Client>) {
client.connect().unwrap();
let username: String = rand::thread_rng()
.sample_iter(&Alphanumeric)
.take(7)
.map(char::from)
.collect();
println!("--- Joining with name: {}", username);
println!("--- Type 'quit' to disconnect");
// You can already send message(s) even before being connected, they will be buffered. Else, just wait for client.is_connected()
client
.send_message(ClientMessage::Join { name: username })
.unwrap();
}
fn main() {
App::new()
.add_plugin(ScheduleRunnerPlugin::default())
.add_plugin(LogPlugin::default())
.add_plugin(QuinnetClientPlugin::default())
// Currently, bevy_quinnet takes its configuration as a resource
.insert_resource(ClientConfigurationData::new(
"127.0.0.1".to_string(),
6000,
"0.0.0.0".to_string(),
0,
))
.insert_resource(Users::default())
.add_startup_system(start_terminal_listener)
.add_startup_system(start_connection)
.add_system(handle_terminal_messages)
.add_system(handle_server_messages)
// CoreStage::PostUpdate so that AppExit events generated in the previous stage are available
.add_system_to_stage(CoreStage::PostUpdate, on_app_exit)
.run();
}
|
