mirror of https://github.com/chipsenkbeil/distant
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
214 lines
7.3 KiB
Rust
214 lines
7.3 KiB
Rust
mod transport;
|
|
pub use transport::{DataStream, Transport, TransportError, TransportReadHalf, TransportWriteHalf};
|
|
|
|
use crate::core::{
|
|
constants::CLIENT_BROADCAST_CHANNEL_CAPACITY,
|
|
data::{Request, Response},
|
|
session::Session,
|
|
utils,
|
|
};
|
|
use log::*;
|
|
use std::{
|
|
collections::HashMap,
|
|
convert,
|
|
sync::{Arc, Mutex},
|
|
};
|
|
use tokio::{
|
|
io,
|
|
net::TcpStream,
|
|
sync::{broadcast, oneshot},
|
|
time::Duration,
|
|
};
|
|
use tokio_stream::wrappers::BroadcastStream;
|
|
|
|
type Callbacks = Arc<Mutex<HashMap<usize, oneshot::Sender<Response>>>>;
|
|
|
|
/// Represents a client that can make requests against a server
|
|
pub struct Client<T>
|
|
where
|
|
T: DataStream,
|
|
{
|
|
/// Underlying transport used by client
|
|
t_write: TransportWriteHalf<T::Write>,
|
|
|
|
/// Collection of callbacks to be invoked upon receiving a response to a request
|
|
callbacks: Callbacks,
|
|
|
|
/// Callback to trigger when a response is received without an origin or with an origin
|
|
/// not found in the list of callbacks
|
|
broadcast: broadcast::Sender<Response>,
|
|
|
|
/// Represents an initial receiver for broadcasted responses that can capture responses
|
|
/// prior to a stream being established and consumed
|
|
init_broadcast_receiver: Option<broadcast::Receiver<Response>>,
|
|
}
|
|
|
|
impl Client<TcpStream> {
|
|
/// Connect to a remote TCP session
|
|
pub async fn tcp_connect(session: Session) -> io::Result<Self> {
|
|
let transport = Transport::<TcpStream>::connect(session).await?;
|
|
debug!(
|
|
"Client has connected to {}",
|
|
transport
|
|
.peer_addr()
|
|
.map(|x| x.to_string())
|
|
.unwrap_or_else(|_| String::from("???"))
|
|
);
|
|
Self::inner_connect(transport).await
|
|
}
|
|
|
|
/// Connect to a remote TCP session, timing out after duration has passed
|
|
pub async fn tcp_connect_timeout(session: Session, duration: Duration) -> io::Result<Self> {
|
|
utils::timeout(duration, Self::tcp_connect(session))
|
|
.await
|
|
.and_then(convert::identity)
|
|
}
|
|
}
|
|
|
|
#[cfg(unix)]
|
|
impl Client<tokio::net::UnixStream> {
|
|
/// Connect to a proxy unix socket
|
|
pub async fn unix_connect(
|
|
path: impl AsRef<std::path::Path>,
|
|
auth_key: Option<Arc<orion::aead::SecretKey>>,
|
|
) -> io::Result<Self> {
|
|
let transport = Transport::<tokio::net::UnixStream>::connect(path, auth_key).await?;
|
|
debug!(
|
|
"Client has connected to {}",
|
|
transport
|
|
.peer_addr()
|
|
.map(|x| format!("{:?}", x))
|
|
.unwrap_or_else(|_| String::from("???"))
|
|
);
|
|
Self::inner_connect(transport).await
|
|
}
|
|
|
|
/// Connect to a proxy unix socket, timing out after duration has passed
|
|
pub async fn unix_connect_timeout(
|
|
path: impl AsRef<std::path::Path>,
|
|
auth_key: Option<Arc<orion::aead::SecretKey>>,
|
|
duration: Duration,
|
|
) -> io::Result<Self> {
|
|
utils::timeout(duration, Self::unix_connect(path, auth_key))
|
|
.await
|
|
.and_then(convert::identity)
|
|
}
|
|
}
|
|
|
|
impl<T> Client<T>
|
|
where
|
|
T: DataStream,
|
|
{
|
|
/// Establishes a connection using the provided session
|
|
async fn inner_connect(transport: Transport<T>) -> io::Result<Self> {
|
|
let (mut t_read, t_write) = transport.into_split();
|
|
let callbacks: Callbacks = Arc::new(Mutex::new(HashMap::new()));
|
|
let (broadcast, init_broadcast_receiver) =
|
|
broadcast::channel(CLIENT_BROADCAST_CHANNEL_CAPACITY);
|
|
|
|
// Start a task that continually checks for responses and triggers callbacks
|
|
let callbacks_2 = Arc::clone(&callbacks);
|
|
let broadcast_2 = broadcast.clone();
|
|
tokio::spawn(async move {
|
|
loop {
|
|
match t_read.receive::<Response>().await {
|
|
Ok(Some(res)) => {
|
|
trace!("Client got response: {:?}", res);
|
|
let maybe_callback = res
|
|
.origin_id
|
|
.as_ref()
|
|
.and_then(|id| callbacks_2.lock().unwrap().remove(id));
|
|
|
|
// If there is an origin to this response, trigger the callback
|
|
if let Some(tx) = maybe_callback {
|
|
trace!("Client has callback! Triggering!");
|
|
if let Err(res) = tx.send(res) {
|
|
error!("Failed to trigger callback for response {}", res.id);
|
|
}
|
|
|
|
// Otherwise, this goes into the junk draw of response handlers
|
|
} else {
|
|
trace!("Client does not have callback! Broadcasting!");
|
|
if let Err(x) = broadcast_2.send(res) {
|
|
error!("Failed to trigger broadcast: {}", x);
|
|
}
|
|
}
|
|
}
|
|
Ok(None) => break,
|
|
Err(x) => {
|
|
error!("{}", x);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
});
|
|
|
|
Ok(Self {
|
|
t_write,
|
|
callbacks,
|
|
broadcast,
|
|
init_broadcast_receiver: Some(init_broadcast_receiver),
|
|
})
|
|
}
|
|
|
|
/// Sends a request and waits for a response
|
|
pub async fn send(&mut self, req: Request) -> Result<Response, TransportError> {
|
|
// First, add a callback that will trigger when we get the response for this request
|
|
let (tx, rx) = oneshot::channel();
|
|
self.callbacks.lock().unwrap().insert(req.id, tx);
|
|
|
|
// Second, send the request
|
|
self.t_write.send(req).await?;
|
|
|
|
// Third, wait for the response
|
|
rx.await
|
|
.map_err(|x| TransportError::from(io::Error::new(io::ErrorKind::ConnectionAborted, x)))
|
|
}
|
|
|
|
/// Sends a request and waits for a response, timing out after duration has passed
|
|
pub async fn send_timeout(
|
|
&mut self,
|
|
req: Request,
|
|
duration: Duration,
|
|
) -> Result<Response, TransportError> {
|
|
utils::timeout(duration, self.send(req))
|
|
.await
|
|
.map_err(TransportError::from)
|
|
.and_then(convert::identity)
|
|
}
|
|
|
|
/// Sends a request without waiting for a response
|
|
///
|
|
/// Any response that would be received gets sent over the broadcast channel instead
|
|
pub async fn fire(&mut self, req: Request) -> Result<(), TransportError> {
|
|
self.t_write.send(req).await
|
|
}
|
|
|
|
/// Sends a request without waiting for a response, timing out after duration has passed
|
|
pub async fn fire_timeout(
|
|
&mut self,
|
|
req: Request,
|
|
duration: Duration,
|
|
) -> Result<(), TransportError> {
|
|
utils::timeout(duration, self.fire(req))
|
|
.await
|
|
.map_err(TransportError::from)
|
|
.and_then(convert::identity)
|
|
}
|
|
|
|
/// Clones a new instance of the broadcaster used by the client
|
|
pub fn to_response_broadcaster(&self) -> broadcast::Sender<Response> {
|
|
self.broadcast.clone()
|
|
}
|
|
|
|
/// Creates and returns a new stream of responses that are received that do not match the
|
|
/// response to a `send` request
|
|
pub fn to_response_broadcast_stream(&mut self) -> BroadcastStream<Response> {
|
|
BroadcastStream::new(
|
|
self.init_broadcast_receiver
|
|
.take()
|
|
.unwrap_or_else(|| self.broadcast.subscribe()),
|
|
)
|
|
}
|
|
}
|