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|
#![feature(box_syntax)]
use bytes::Bytes;
use clap::{Parser, Subcommand};
use client_native_lib::{
connect,
peer::Peer,
state::{HasPeer, PeerInit},
webrtc::data_channel::RTCDataChannel,
Config,
};
use log::{error, info};
use std::{future::Future, pin::Pin, sync::Arc};
use tokio::{
fs::File,
io::{stdin, stdout, AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt},
sync::RwLock,
};
fn main() {
env_logger::init_from_env("LOG");
tokio::runtime::Builder::new_multi_thread()
.enable_all()
.build()
.unwrap()
.block_on(run())
}
#[derive(Parser)]
pub struct Args {
#[clap(long, default_value = "meet.metamuffin.org")]
signaling_host: String,
#[clap(short, long)]
secret: String,
#[clap(subcommand)]
action: Action,
}
async fn run() {
let args = Args::parse();
connect(
Config {
secret: args.secret.clone(),
signaling_host: args.signaling_host.clone(),
},
Arc::new(Conn {
args: Arc::new(args),
}),
)
.await;
tokio::signal::ctrl_c().await.unwrap();
error!("interrupt received, exiting");
}
#[derive(Subcommand)]
pub enum Action {
Send { filename: Option<String> },
Receive { filename: Option<String> },
}
impl Action {
pub async fn create_writer(&self) -> Pin<Box<dyn AsyncWrite + Send + Sync + 'static>> {
match self {
Action::Receive { filename } => {
if let Some(filename) = filename {
Box::pin(File::create(filename).await.unwrap())
} else {
Box::pin(stdout())
}
}
_ => unreachable!(),
}
}
pub async fn create_reader(&self) -> Pin<Box<dyn AsyncRead + Send + Sync + 'static>> {
match self {
Action::Send { filename } => {
if let Some(filename) = filename {
Box::pin(File::open(filename).await.unwrap())
} else {
Box::pin(stdin())
}
}
_ => unreachable!(),
}
}
}
pub struct Conn {
pub args: Arc<Args>,
}
pub struct PeerState {
args: Arc<Args>,
peer: Arc<Peer>,
}
impl PeerInit<PeerState> for Conn {
fn add_peer(
&self,
peer: Arc<Peer>,
) -> Pin<Box<(dyn Future<Output = Arc<PeerState>> + Send + Sync + 'static)>> {
let args = self.args.clone();
Box::pin(async move {
let p = Arc::new(PeerState { peer, args });
p.clone().init().await;
p
})
}
}
impl HasPeer for PeerState {
fn peer(&self) -> &Arc<Peer> {
&self.peer
}
}
impl PeerState {
pub async fn init(self: Arc<Self>) {
let s = self.clone();
match &self.args.action {
Action::Send { .. } => self.init_send_channel().await,
Action::Receive { .. } => {
self.peer
.peer_connection
.on_data_channel(box move |ch| {
let s = s.clone();
Box::pin(async move { s.init_receive_channel(ch).await })
})
.await;
}
}
}
pub async fn init_receive_channel(self: Arc<Self>, channel: Arc<RTCDataChannel>) {
info!("got a data channel");
let writer = Arc::new(RwLock::new(None));
{
let writer = writer.clone();
channel
.on_open(box move || {
info!("channel opened");
Box::pin(async move {
*writer.write().await = Some(self.args.action.create_writer().await);
})
})
.await;
}
{
let writer = writer.clone();
channel
.on_close(box move || {
info!("channel closed");
let writer = writer.clone();
Box::pin(async move {
*writer.write().await = None; // drop the writer, so it closes the file or whatever
})
})
.await;
}
{
let writer = writer.clone();
channel
.on_message(box move |mesg| {
let writer = writer.clone();
Box::pin(async move {
writer
.write()
.await
.as_mut()
.unwrap()
.write_all(&mesg.data)
.await
.unwrap();
})
})
.await;
}
channel
.on_error(box move |err| {
info!("channel error: {err:?}");
Box::pin(async {})
})
.await;
}
pub async fn init_send_channel(&self) {
info!("creating data channel");
let data_channel = self
.peer
.peer_connection
.create_data_channel("file-transfer", None)
.await
.unwrap();
let weak = Arc::downgrade(&data_channel);
let args = self.args.clone();
data_channel
.on_open(box move || {
let args = args.clone();
let data_channel = weak.upgrade().unwrap();
Box::pin(async move {
let mut reader = args.action.create_reader().await;
info!("starting transmission");
loop {
let mut buf = [0u8; 4096];
let size = reader.read(&mut buf).await.unwrap();
if size == 0 {
break;
}
data_channel
.send(&Bytes::from_iter(buf[0..size].into_iter().map(|e| *e)))
.await
.unwrap();
}
info!("transmission finished");
drop(reader);
info!("now closing the channel again…");
data_channel.close().await.unwrap();
})
})
.await;
data_channel
.on_close(box || Box::pin(async move { info!("data channel closed") }))
.await;
data_channel
.on_error(box |err| Box::pin(async move { error!("data channel error: {err}") }))
.await;
}
}
|
