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|
#![allow(clippy::disallowed_types)]
use std::{io, time::Duration};
use futures::{FutureExt, SinkExt, StreamExt, channel::mpsc, future::BoxFuture, pin_mut};
use hyper_util::rt::TokioIo;
use mullvad_management_interface::{ManagementServiceClient, MullvadProxyClient};
use test_rpc::transport::{ConnectionHandle, GrpcForwarder};
use tokio::io::{AsyncReadExt, AsyncWriteExt, DuplexStream};
use tokio_util::codec::{Decoder, LengthDelimitedCodec};
use tower::Service;
const GRPC_REQUEST_TIMEOUT: Duration = Duration::from_secs(10);
const CONVERTER_BUF_SIZE: usize = 16 * 1024;
#[derive(Clone)]
struct DummyService {
management_channel_provider_tx: mpsc::UnboundedSender<TokioIo<DuplexStream>>,
}
impl<Request> Service<Request> for DummyService {
type Response = TokioIo<DuplexStream>;
type Error = std::io::Error;
type Future = BoxFuture<'static, Result<TokioIo<DuplexStream>, Self::Error>>;
fn poll_ready(
&mut self,
_: &mut std::task::Context<'_>,
) -> std::task::Poll<Result<(), Self::Error>> {
std::task::Poll::Ready(Ok(()))
}
fn call(&mut self, _: Request) -> Self::Future {
log::trace!("DummyService::call");
let (channel_in, channel_out) = tokio::io::duplex(CONVERTER_BUF_SIZE);
let notifier_tx = self.management_channel_provider_tx.clone();
Box::pin(async move {
notifier_tx
.unbounded_send(TokioIo::new(channel_in))
.map_err(|_| io::Error::other("stream receiver is down"))?;
Ok(TokioIo::new(channel_out))
})
}
}
#[derive(Clone)]
pub struct RpcClientProvider {
service: DummyService,
}
impl RpcClientProvider {
pub async fn new_client(&self) -> MullvadProxyClient {
// FIXME: Ugly workaround to ensure that we don't receive stuff from a
// previous RPC session.
tokio::time::sleep(std::time::Duration::from_millis(500)).await;
log::trace!("Mullvad daemon: connecting");
let channel = tonic::transport::Endpoint::from_static("serial://placeholder")
.timeout(GRPC_REQUEST_TIMEOUT)
.connect_with_connector(self.service.clone())
.await
.unwrap();
MullvadProxyClient::from_rpc_client(ManagementServiceClient::new(channel))
}
}
pub fn new_rpc_client(
connection_handle: ConnectionHandle,
mullvad_daemon_transport: GrpcForwarder,
) -> RpcClientProvider {
let mut framed_transport = LengthDelimitedCodec::new().framed(mullvad_daemon_transport);
let (management_channel_provider_tx, mut management_channel_provider_rx) = mpsc::unbounded();
tokio::spawn(async move {
let mut read_buf = [0u8; CONVERTER_BUF_SIZE];
loop {
log::trace!("waiting for management interface client");
let mut management_channel_in: DuplexStream =
match management_channel_provider_rx.next().await {
Some(channel) => TokioIo::into_inner(channel),
None => {
log::trace!("exiting management interface forward loop");
break;
}
};
// clear data from last session
while let Some(_next) = framed_transport.next().now_or_never() {}
loop {
let proxy_read = management_channel_in.read(&mut read_buf);
pin_mut!(proxy_read);
let reset_notified = connection_handle.notified_reset();
pin_mut!(reset_notified);
match futures::future::select(
reset_notified,
futures::future::select(framed_transport.next(), proxy_read),
)
.await
{
futures::future::Either::Left(_) => {
log::debug!("Restarting daemon RPC client");
break;
}
futures::future::Either::Right((
futures::future::Either::Left((Some(Ok(bytes)), _)),
_,
)) => {
if bytes.is_empty() {
log::trace!("Management channel EOF");
if let Err(error) = management_channel_in.shutdown().await {
log::error!("Failed to shut down forwarder stream: {}", error);
}
break;
}
if management_channel_in.write_all(&bytes).await.is_err() {
break;
}
}
futures::future::Either::Right((
futures::future::Either::Left((Some(Err(error)), _)),
_,
)) => {
log::debug!("Management channel stream errored: {}", error);
break;
}
futures::future::Either::Right((
futures::future::Either::Left((None, _)),
_,
)) => break,
futures::future::Either::Right((
futures::future::Either::Right((Ok(num_bytes), _)),
_,
)) => {
if framed_transport
.send(read_buf[..num_bytes].to_vec().into())
.await
.is_err()
{
break;
}
if num_bytes == 0 {
log::trace!("Mullvad daemon connection EOF");
break;
}
}
futures::future::Either::Right((
futures::future::Either::Right((Err(_), _)),
_,
)) => {
let _ = framed_transport.send(bytes::Bytes::new()).await;
break;
}
}
}
}
});
let service = DummyService {
management_channel_provider_tx,
};
RpcClientProvider { service }
}
|
