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use once_cell::sync::Lazy;
use std::collections::HashMap;
use std::net::SocketAddr;
use std::sync::atomic::{AtomicUsize, Ordering};
use std::sync::{Arc, Mutex};
use test_rpc::net::SockHandleId;
use tokio::net::TcpListener;
use tokio::net::TcpStream;
static SERVERS: Lazy<Mutex<HashMap<SockHandleId, Handle>>> =
Lazy::new(|| Mutex::new(HashMap::new()));
/// Spawn a TCP forwarder that sends TCP via `via_addr`
pub async fn start_server(
bind_addr: SocketAddr,
via_addr: SocketAddr,
) -> Result<(SockHandleId, SocketAddr), test_rpc::Error> {
let next_nonce = {
static NONCE: AtomicUsize = AtomicUsize::new(0);
|| NONCE.fetch_add(1, Ordering::Relaxed)
};
let id = SockHandleId(next_nonce());
let handle = tcp_forward(bind_addr, via_addr).await.map_err(|error| {
log::error!("Failed to start TCP forwarder listener: {error}");
test_rpc::Error::TcpForward
})?;
let bind_addr = handle.local_addr();
let mut servers = SERVERS.lock().unwrap();
servers.insert(id, handle);
Ok((id, bind_addr))
}
/// Stop TCP forwarder given some ID returned by `start_server`
pub fn stop_server(id: SockHandleId) -> Result<(), test_rpc::Error> {
let handle = {
let mut servers = SERVERS.lock().unwrap();
servers.remove(&id)
};
if let Some(handle) = handle {
handle.close();
}
Ok(())
}
struct Handle {
handle: tokio::task::JoinHandle<()>,
bind_addr: SocketAddr,
clients: Arc<Mutex<Vec<tokio::task::JoinHandle<()>>>>,
}
impl Handle {
pub fn close(&self) {
self.handle.abort();
let mut clients = self.clients.lock().unwrap();
for client in clients.drain(..) {
client.abort();
}
}
pub fn local_addr(&self) -> SocketAddr {
self.bind_addr
}
}
impl Drop for Handle {
fn drop(&mut self) {
self.close();
}
}
/// Forward TCP traffic via `proxy_addr`
async fn tcp_forward(
bind_addr: SocketAddr,
proxy_addr: SocketAddr,
) -> Result<Handle, test_rpc::Error> {
let listener = TcpListener::bind(&bind_addr).await.map_err(|error| {
log::error!("Failed to bind TCP forward socket: {error}");
test_rpc::Error::TcpForward
})?;
let bind_addr = listener.local_addr().map_err(|error| {
log::error!("Failed to get TCP socket addr: {error}");
test_rpc::Error::TcpForward
})?;
let clients = Arc::new(Mutex::new(vec![]));
let clients_copy = clients.clone();
let handle = tokio::spawn(async move {
loop {
match listener.accept().await {
Ok((mut client, _addr)) => {
let client_handle = tokio::spawn(async move {
let mut proxy = match TcpStream::connect(proxy_addr).await {
Ok(proxy) => proxy,
Err(error) => {
log::error!("failed to connect to TCP proxy: {error}");
return;
}
};
if let Err(error) =
tokio::io::copy_bidirectional(&mut client, &mut proxy).await
{
log::error!("copy_directional failed: {error}");
}
});
clients_copy.lock().unwrap().push(client_handle);
}
Err(error) => {
log::error!("failed to accept TCP client: {error}");
}
}
}
});
Ok(Handle {
handle,
bind_addr,
clients,
})
}
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