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udp.rs
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udp.rs
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use crate::rtp::core::RtpHeader;
use crate::sdp::media::{MediaAddrMessage, MediaList, MediaUserMessage, MediaUserStorage};
use crate::{
client::{
actor::ClientActor,
group::GroupId,
sessions::{Session, SessionMessage, SessionsStorage},
},
dtls::is_dtls,
server::{crypto::Crypto, meta::ServerMeta},
stun::{parse_stun_binding_request, write_stun_success_response, StunBindingRequest},
};
use actix::prelude::*;
use futures::task::Poll;
use futures::{FutureExt, StreamExt, TryFutureExt};
use log::{info, warn};
use smallvec::SmallVec;
use std::{collections::HashMap, net::SocketAddr, sync::Arc, time::SystemTime};
use tokio::macros::support::Pin;
use tokio::{
net::udp::{RecvHalf, SendHalf},
net::UdpSocket,
time::Duration,
};
pub struct UdpRecv {
send: Addr<UdpSend>,
dtls: Addr<ClientActor>,
data: Arc<ServerData>,
sessions: SessionsStorage,
media_sessions: MediaUserStorage,
}
impl Actor for UdpRecv {
type Context = Context<Self>;
}
impl UdpRecv {
pub fn new(
recv: RecvHalf,
send: Addr<UdpSend>,
dtls: Addr<ClientActor>,
data: Arc<ServerData>,
) -> Addr<UdpRecv> {
UdpRecv::create(|ctx| {
ctx.set_mailbox_capacity(1024);
ctx.add_message_stream(futures::stream::unfold(recv, |mut recv| async move {
let mut message = DataPacket::with_capacity(1200);
unsafe { message.set_len(1200) }
match recv.recv_from(&mut message).await {
Ok((n, addr)) => {
message.truncate(n);
let message = WebRtcRequest::from((message, addr));
Some((message, recv))
}
Err(err) => {
warn!("could not receive UDP message: {}", err);
None
}
}
}));
ctx.add_stream(tokio::time::interval(Duration::from_secs(60)).map(|_| ClearData));
UdpRecv {
send,
dtls,
data,
sessions: HashMap::new(),
media_sessions: HashMap::new(),
}
})
}
}
impl Handler<ServerDataRequest> for UdpRecv {
type Result = ServerData;
fn handle(&mut self, _: ServerDataRequest, _ctx: &mut Context<Self>) -> Self::Result {
ServerData::clone(&self.data)
}
}
impl Handler<WebRtcRequest> for UdpRecv {
type Result = ();
fn handle(&mut self, item: WebRtcRequest, ctx: &mut Context<Self>) {
match item {
WebRtcRequest::Stun(req, addr) => {
let session = Session::new(req.server_user.clone(), req.remote_user.clone());
if let Some((group_id, ttl)) = self.sessions.get_mut(&session) {
*ttl = SystemTime::now();
let group_id = *group_id;
let media = self
.media_sessions
.get(&req.remote_user)
.map(MediaList::clone);
if let Some(media) = media {
ctx.spawn(
self.dtls
.send(MediaAddrMessage(addr, media))
.inspect_err(|e| warn!("dtls send err: {:?}", e))
.map(|_| ())
.into_actor(self),
);
}
ctx.spawn(
futures::future::try_join(
self.send.send(WebRtcRequest::Stun(req, addr)),
self.dtls.send(GroupId(group_id, addr)),
)
.inspect_err(|e| warn!("dtls or udp send err: {:?}", e))
.map(|_| ())
.into_actor(self),
);
}
}
WebRtcRequest::Dtls(message, addr) => {
ctx.spawn(
self.dtls
.send(WebRtcRequest::Dtls(message, addr))
.inspect_err(|e| warn!("dtls send err: {:?}", e))
.map(|_| ())
.into_actor(self),
);
}
WebRtcRequest::Rtc(message, addr) => {
ctx.spawn(
self.dtls
.send(WebRtcRequest::Rtc(message, addr))
.inspect_err(|e| warn!("dtls send err: {:?}", e))
.map(|_| ())
.into_actor(self),
);
}
WebRtcRequest::Unknown => warn!("recv unknown request"),
}
}
}
impl StreamHandler<ClearData> for UdpRecv {
fn handle(&mut self, _: ClearData, _ctx: &mut Context<Self>) {
let sessions_to_remove: Vec<Session> = self
.sessions
.iter()
.filter(|(_, (_, time))| match time.elapsed() {
Ok(d) => d > Duration::from_secs(60),
Err(_e) => false,
})
.map(|(s, (_, _))| s.clone())
.collect();
sessions_to_remove.into_iter().for_each(|s| {
self.sessions.remove(&s);
self.media_sessions.remove(&s.get_client());
});
}
}
impl Handler<SessionMessage> for UdpRecv {
type Result = bool;
fn handle(
&mut self,
SessionMessage(session, id): SessionMessage,
_ctx: &mut Context<Self>,
) -> Self::Result {
self.sessions.insert(session, (id, SystemTime::now()));
true
}
}
impl Handler<MediaUserMessage> for UdpRecv {
type Result = ();
fn handle(
&mut self,
MediaUserMessage(user_name, media): MediaUserMessage,
_ctx: &mut Context<Self>,
) -> Self::Result {
self.media_sessions.insert(user_name, media);
}
}
pub struct UdpSend {
send: Arc<SendHalf>,
data: Arc<ServerData>,
}
impl UdpSend {
pub fn new(send: SendHalf, data: Arc<ServerData>) -> Addr<Self> {
Self::create(|ctx| {
ctx.set_mailbox_capacity(1024);
Self {
send: Arc::new(send),
data,
}
})
}
}
impl Actor for UdpSend {
type Context = Context<Self>;
fn stopped(&mut self, _ctx: &mut Self::Context) {
info!("stopping")
}
}
impl Handler<WebRtcRequest> for UdpSend {
type Result = ();
fn handle(&mut self, msg: WebRtcRequest, ctx: &mut Context<Self>) -> Self::Result {
let send = self.send.clone();
match msg {
WebRtcRequest::Stun(req, addr) => {
let mut message_buf: DataPacket = DataPacket::with_capacity(1200);
unsafe { message_buf.set_len(1200) }
let n = write_stun_success_response(
req.transaction_id,
addr,
self.data.meta.password.as_bytes(),
&mut message_buf,
);
let n = match n {
Ok(n) => n,
Err(e) => {
warn!("error on writing stun response: {}", e);
return;
}
};
message_buf.truncate(n);
ctx.spawn(
UdpMassSender(send, addr, message_buf)
.inspect_err(|e| {
if e.kind() != std::io::ErrorKind::AddrNotAvailable {
warn!("err stun: {:?}", e)
}
})
.map(|_| ())
.into_actor(self),
);
}
WebRtcRequest::Dtls(message, addr) => {
ctx.spawn(
UdpMassSender(send, addr, message)
.inspect_err(|e| warn!("err dtls send: {:?}", e))
.map(|_| ())
.into_actor(self),
);
}
WebRtcRequest::Rtc(message, addr) => {
ctx.spawn(
UdpMassSender(send, addr, message)
.inspect_err(|e| warn!("err rtc send: {:?}", e))
.map(|_| ())
.into_actor(self),
);
}
WebRtcRequest::Unknown => warn!("send unknown request"),
}
}
}
pub async fn create_udp(addr: SocketAddr) -> (Addr<UdpRecv>, Addr<UdpSend>) {
let server = UdpSocket::bind(addr).await.expect("udp must be up");
let meta = ServerMeta::new();
let crypto = Crypto::init().expect("WebRTC server could not initialize OpenSSL primitives");
let data = Arc::new(ServerData { meta, crypto });
let (recv, send) = server.split();
let udp_send = UdpSend::new(send, Arc::clone(&data));
let dtls = ClientActor::new(Arc::clone(&data.crypto.ssl_acceptor), udp_send.clone());
let udp_recv = UdpRecv::new(recv, udp_send.clone(), dtls, data);
(udp_recv, udp_send)
}
#[derive(Debug, Clone)]
pub enum WebRtcRequest {
Stun(StunBindingRequest, SocketAddr),
Dtls(DataPacket, SocketAddr),
Rtc(DataPacket, SocketAddr),
Unknown,
}
impl From<(DataPacket, SocketAddr)> for WebRtcRequest {
fn from((buf, addr): (DataPacket, SocketAddr)) -> Self {
if RtpHeader::is_rtp_header(&buf) {
return WebRtcRequest::Rtc(buf, addr);
}
if let Some(stun) = parse_stun_binding_request(&buf) {
return WebRtcRequest::Stun(stun, addr);
}
if is_dtls(&buf) {
return WebRtcRequest::Dtls(buf, addr);
}
WebRtcRequest::Unknown
}
}
impl Message for WebRtcRequest {
type Result = ();
}
#[derive(MessageResponse, Clone)]
pub struct ServerData {
pub crypto: Crypto,
pub meta: ServerMeta,
}
#[derive(Message)]
#[rtype(result = "ServerData")]
pub struct ServerDataRequest;
struct ClearData;
impl Message for ClearData {
type Result = ();
}
struct UdpMassSender(Arc<SendHalf>, SocketAddr, DataPacket);
impl Future for UdpMassSender {
type Output = std::io::Result<usize>;
fn poll(self: Pin<&mut Self>, cx: &mut std::task::Context<'_>) -> Poll<Self::Output> {
self.0.as_ref().as_ref().poll_send_to(cx, &self.2, &self.1)
}
}
pub type DataPacket = SmallVec<[u8; 2048]>;