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use anyhow::anyhow;
use clap::Parser;
use tokio::io::{AsyncReadExt, AsyncWriteExt};
use tokio_listener::{self, SystemOptions, UserOptions};
use tracing::{error, info, instrument};
use nix_compat::wire::primitive;
#[derive(Parser, Debug)]
struct Cli {
/// Listening unix socket path
#[arg(short, long)]
socket: Option<String>,
}
#[tokio::main]
#[instrument()]
async fn main() {
tracing_subscriber::fmt().compact().try_init().unwrap();
let args = Cli::parse();
info!("Started Tvix daemon");
let addr = args
.socket
.unwrap_or_else(|| "sd_listen_unix".to_string())
.parse()
.expect("Invalid listening socket address");
let system_options: SystemOptions = Default::default();
let user_options: UserOptions = Default::default();
let mut listener = tokio_listener::Listener::bind(&addr, &system_options, &user_options)
.await
.unwrap();
info!("Listening for incoming connections on {:?}", listener);
while let Ok((conn, addr)) = listener.accept().await {
info!("Incoming connection from {addr}");
tokio::spawn(async move { worker(conn).await });
}
}
/// Worker in charge to respond a Nix client using the Nix wire
/// protocol.
#[instrument()]
async fn worker<R>(mut conn: R)
where
R: AsyncReadExt + AsyncWriteExt + Unpin + std::fmt::Debug,
{
match perform_init_handshake(&mut conn).await {
Ok(_) => {
// TODO: process request here, dispatch to operation
// handler.
info!("Handshake done, bye now");
}
Err(e) => error!("Client handshake failed: {}", e),
}
}
/// Performs the initial handshake. During the handshake, the client
/// will first send a magic u64, to which the daemon needs to respond
/// with another magic u64.
async fn perform_init_handshake<'a, R: 'a>(mut conn: &'a mut R) -> anyhow::Result<()>
where
&'a mut R: AsyncReadExt + AsyncWriteExt + Unpin,
{
let mut magic_hello = vec![0; 8];
conn.read(&mut magic_hello).await?;
if magic_hello != primitive::MAGIC_HELLO {
Err(anyhow!(
"Invalid client hello received: {:?}, expected {:?}",
magic_hello,
primitive::MAGIC_HELLO
))
} else {
conn.write(&primitive::MAGIC_HELLO_RESPONSE).await?;
Ok(())
}
}
#[cfg(test)]
mod integration_tests {
use nix_compat::wire::primitive;
#[tokio::test]
async fn test_init_handshake() {
let mut test_conn = tokio_test::io::Builder::new()
.read(&primitive::MAGIC_HELLO)
.write(&primitive::MAGIC_HELLO_RESPONSE)
.build();
crate::worker(&mut test_conn).await;
}
}
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