This commit is contained in:
Michael Zhang 2023-05-04 20:57:10 -05:00
parent 0d9435e3e9
commit 7b4a511bdd
11 changed files with 1172 additions and 0 deletions

2
.cargo/config.toml Normal file
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@ -0,0 +1,2 @@
[registries.crates-io]
protocol = "sparse"

179
client/package-lock.json generated
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@ -4,6 +4,9 @@
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@ -5,5 +5,8 @@
"devDependencies": {
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"vite": "^4.3.4"
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}

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@ -3,14 +3,17 @@ import { defineConfig } from "vite";
export default defineConfig({
// prevent vite from obscuring rust errors
clearScreen: false,
// Tauri expects a fixed port, fail if that port is not available
server: {
strictPort: true,
},
// to make use of `TAURI_PLATFORM`, `TAURI_ARCH`, `TAURI_FAMILY`,
// `TAURI_PLATFORM_VERSION`, `TAURI_PLATFORM_TYPE` and `TAURI_DEBUG`
// env variables
envPrefix: ["VITE_", "TAURI_"],
build: {
// Tauri uses Chromium on Windows and WebKit on macOS and Linux
target: process.env.TAURI_PLATFORM == "windows" ? "chrome105" : "safari13",

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@ -0,0 +1,14 @@
syntax = "proto3";
message ChatMessage {
string from = 1;
string msg = 2;
string time = 3;
}
service ChatService {
rpc join(User) returns (JoinResponse) {}
rpc sendMsg(ChatMessage) returns (Empty) {}
rpc receiveMsg(Empty) returns (stream ChatMessage) {}
rpc getAllUsers(Empty) returns (UserList) {}
}

3
rustfmt.toml Normal file
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max_width = 80
tab_spaces = 2
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target

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14
server/Cargo.toml Normal file
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@ -0,0 +1,14 @@
[package]
name = "server"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
futures = "0.3.28"
tokio = { version = "1.28.0", features = ["full"] }
tokio-stream = { version = "0.1.14", features = ["full"] }
tokio-util = { version = "0.7.8", features = ["full"] }
tracing = "0.1.37"
tracing-subscriber = { version = "0.3.17", features = ["env-filter"] }

222
server/src/main.rs Normal file
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@ -0,0 +1,222 @@
mod room;
use tokio::net::{TcpListener, TcpStream};
use tokio::sync::{mpsc, Mutex};
use tokio_stream::StreamExt;
use tokio_util::codec::{Framed, LinesCodec};
use futures::SinkExt;
use std::collections::HashMap;
use std::env;
use std::error::Error;
use std::io;
use std::net::SocketAddr;
use std::sync::Arc;
#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
use tracing_subscriber::{fmt::format::FmtSpan, EnvFilter};
// Configure a `tracing` subscriber that logs traces emitted by the chat
// server.
tracing_subscriber::fmt()
// Filter what traces are displayed based on the RUST_LOG environment
// variable.
//
// Traces emitted by the example code will always be displayed. You
// can set `RUST_LOG=tokio=trace` to enable additional traces emitted by
// Tokio itself.
.with_env_filter(
EnvFilter::from_default_env().add_directive("chat=info".parse()?),
)
// Log events when `tracing` spans are created, entered, exited, or
// closed. When Tokio's internal tracing support is enabled (as
// described above), this can be used to track the lifecycle of spawned
// tasks on the Tokio runtime.
.with_span_events(FmtSpan::FULL)
// Set this subscriber as the default, to collect all traces emitted by
// the program.
.init();
// Create the shared state. This is how all the peers communicate.
//
// The server task will hold a handle to this. For every new client, the
// `state` handle is cloned and passed into the task that processes the
// client connection.
let state = Arc::new(Mutex::new(Shared::new()));
let addr = env::args()
.nth(1)
.unwrap_or_else(|| "127.0.0.1:6142".to_string());
// Bind a TCP listener to the socket address.
//
// Note that this is the Tokio TcpListener, which is fully async.
let listener = TcpListener::bind(&addr).await?;
tracing::info!("server running on {}", addr);
loop {
// Asynchronously wait for an inbound TcpStream.
let (stream, addr) = listener.accept().await?;
// Clone a handle to the `Shared` state for the new connection.
let state = Arc::clone(&state);
// Spawn our handler to be run asynchronously.
tokio::spawn(async move {
tracing::debug!("accepted connection");
if let Err(e) = process(state, stream, addr).await {
tracing::info!("an error occurred; error = {:?}", e);
}
});
}
}
/// Shorthand for the transmit half of the message channel.
type Tx = mpsc::UnboundedSender<String>;
/// Shorthand for the receive half of the message channel.
type Rx = mpsc::UnboundedReceiver<String>;
/// Data that is shared between all peers in the chat server.
///
/// This is the set of `Tx` handles for all connected clients. Whenever a
/// message is received from a client, it is broadcasted to all peers by
/// iterating over the `peers` entries and sending a copy of the message on each
/// `Tx`.
struct Shared {
peers: HashMap<SocketAddr, Tx>,
}
/// The state for each connected client.
struct Peer {
/// The TCP socket wrapped with the `Lines` codec, defined below.
///
/// This handles sending and receiving data on the socket. When using
/// `Lines`, we can work at the line level instead of having to manage the
/// raw byte operations.
lines: Framed<TcpStream, LinesCodec>,
/// Receive half of the message channel.
///
/// This is used to receive messages from peers. When a message is received
/// off of this `Rx`, it will be written to the socket.
rx: Rx,
}
impl Shared {
/// Create a new, empty, instance of `Shared`.
fn new() -> Self {
Shared {
peers: HashMap::new(),
}
}
/// Send a `LineCodec` encoded message to every peer, except
/// for the sender.
async fn broadcast(&mut self, sender: SocketAddr, message: &str) {
for peer in self.peers.iter_mut() {
if *peer.0 != sender {
let _ = peer.1.send(message.into());
}
}
}
}
impl Peer {
/// Create a new instance of `Peer`.
async fn new(
state: Arc<Mutex<Shared>>,
lines: Framed<TcpStream, LinesCodec>,
) -> io::Result<Peer> {
// Get the client socket address
let addr = lines.get_ref().peer_addr()?;
// Create a channel for this peer
let (tx, rx) = mpsc::unbounded_channel();
// Add an entry for this `Peer` in the shared state map.
state.lock().await.peers.insert(addr, tx);
Ok(Peer { lines, rx })
}
}
/// Process an individual chat client
async fn process(
state: Arc<Mutex<Shared>>,
stream: TcpStream,
addr: SocketAddr,
) -> Result<(), Box<dyn Error>> {
let mut lines = Framed::new(stream, LinesCodec::new());
// Send a prompt to the client to enter their username.
lines.send("Please enter your username:").await?;
// Read the first line from the `LineCodec` stream to get the username.
let username = match lines.next().await {
Some(Ok(line)) => line,
// We didn't get a line so we return early here.
_ => {
tracing::error!(
"Failed to get username from {}. Client disconnected.",
addr
);
return Ok(());
}
};
// Register our peer with state which internally sets up some channels.
let mut peer = Peer::new(state.clone(), lines).await?;
// A client has connected, let's let everyone know.
{
let mut state = state.lock().await;
let msg = format!("{} has joined the chat", username);
tracing::info!("{}", msg);
state.broadcast(addr, &msg).await;
}
// Process incoming messages until our stream is exhausted by a disconnect.
loop {
tokio::select! {
// A message was received from a peer. Send it to the current user.
Some(msg) = peer.rx.recv() => {
peer.lines.send(&msg).await?;
}
result = peer.lines.next() => match result {
// A message was received from the current user, we should
// broadcast this message to the other users.
Some(Ok(msg)) => {
let mut state = state.lock().await;
let msg = format!("{}: {}", username, msg);
state.broadcast(addr, &msg).await;
}
// An error occurred.
Some(Err(e)) => {
tracing::error!(
"an error occurred while processing messages for {}; error = {:?}",
username,
e
);
}
// The stream has been exhausted.
None => break,
},
}
}
// If this section is reached it means that the client was disconnected!
// Let's let everyone still connected know about it.
{
let mut state = state.lock().await;
state.peers.remove(&addr);
let msg = format!("{} has left the chat", username);
tracing::info!("{}", msg);
state.broadcast(addr, &msg).await;
}
Ok(())
}

11
server/src/room.rs Normal file
View file

@ -0,0 +1,11 @@
use tokio::sync::broadcast::{Receiver, Sender};
pub struct Message {}
pub type MessageTx = Sender<Message>;
pub type MessageRx = Receiver<Message>;
pub struct Room {
sender: MessageTx,
receiver: MessageRx,
}