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use futures::ready;
use std::fmt;
use std::pin::Pin;
use std::task::{Context, Poll};
use async_trait::async_trait;
use openssl::ssl::{Ssl, SslContext};
use tokio::io::{self, AsyncRead, AsyncWrite, AsyncWriteExt, Interest, ReadBuf, Ready};
use tokio_openssl::SslStream;
use tracing::trace;
use ore::cast::CastFrom;
use ore::metrics::MetricsRegistry;
use ore::netio::AsyncReady;
use crate::codec::{self, FramedConn, ACCEPT_SSL_ENCRYPTION, REJECT_ENCRYPTION};
use crate::message::FrontendStartupMessage;
use crate::metrics::Metrics;
use crate::protocol;
#[derive(Debug)]
pub struct Config<'a> {
pub coord_client: coord::Client,
pub tls: Option<TlsConfig>,
pub metrics_registry: &'a MetricsRegistry,
}
#[derive(Debug)]
pub struct TlsConfig {
pub context: SslContext,
pub mode: TlsMode,
}
#[derive(Debug, Clone, Copy)]
pub enum TlsMode {
Require,
VerifyUser,
}
pub struct Server {
tls: Option<TlsConfig>,
coord_client: coord::Client,
metrics: Metrics,
}
impl Server {
pub fn new(config: Config<'_>) -> Server {
Server {
metrics: Metrics::register_into(config.metrics_registry),
tls: config.tls,
coord_client: config.coord_client,
}
}
pub async fn handle_connection<A>(&self, conn: A) -> Result<(), anyhow::Error>
where
A: AsyncRead + AsyncWrite + AsyncReady + Send + Sync + Unpin + fmt::Debug + 'static,
{
let mut coord_client = self.coord_client.new_conn()?;
let conn_id = coord_client.conn_id();
let mut conn = Conn::Unencrypted(MeteredConn {
metrics: &self.metrics,
inner: conn,
});
loop {
let message = codec::decode_startup(&mut conn).await?;
match &message {
Some(message) => trace!("cid={} recv={:?}", conn_id, message),
None => trace!("cid={} recv=<eof>", conn_id),
}
conn = match message {
None => return Ok(()),
Some(FrontendStartupMessage::Startup { version, params }) => {
let mut conn = FramedConn::new(conn_id, conn);
protocol::run(protocol::RunParams {
tls_mode: self.tls.as_ref().map(|tls| tls.mode),
coord_client,
conn: &mut conn,
version,
params,
metrics: &self.metrics,
})
.await?;
conn.flush().await?;
return Ok(());
}
Some(FrontendStartupMessage::CancelRequest {
conn_id,
secret_key,
}) => {
coord_client.cancel_request(conn_id, secret_key).await;
return Ok(());
}
Some(FrontendStartupMessage::SslRequest) => match (conn, &self.tls) {
(Conn::Unencrypted(mut conn), Some(tls)) => {
trace!("cid={} send=AcceptSsl", conn_id);
conn.write_all(&[ACCEPT_SSL_ENCRYPTION]).await?;
let mut ssl_stream = SslStream::new(Ssl::new(&tls.context)?, conn)?;
if let Err(e) = Pin::new(&mut ssl_stream).accept().await {
let _ = ssl_stream.get_mut().shutdown().await;
return Err(e.into());
}
Conn::Ssl(ssl_stream)
}
(mut conn, _) => {
trace!("cid={} send=RejectSsl", conn_id);
conn.write_all(&[REJECT_ENCRYPTION]).await?;
conn
}
},
Some(FrontendStartupMessage::GssEncRequest) => {
trace!("cid={} send=RejectGssEnc", conn_id);
conn.write_all(&[REJECT_ENCRYPTION]).await?;
conn
}
}
}
}
pub fn metrics(&self) -> Metrics {
self.metrics.clone()
}
}
pub struct MeteredConn<'a, A> {
inner: A,
metrics: &'a Metrics,
}
impl<'a, A> AsyncRead for MeteredConn<'a, A>
where
A: AsyncRead + AsyncWrite + Unpin,
{
fn poll_read(
mut self: Pin<&mut Self>,
cx: &mut Context,
buf: &mut ReadBuf,
) -> Poll<io::Result<()>> {
Pin::new(&mut self.inner).poll_read(cx, buf)
}
}
impl<'a, A> AsyncWrite for MeteredConn<'a, A>
where
A: AsyncRead + AsyncWrite + Unpin,
{
fn poll_write(
mut self: Pin<&mut Self>,
cx: &mut Context,
buf: &[u8],
) -> Poll<io::Result<usize>> {
let n = ready!(Pin::new(&mut self.inner).poll_write(cx, buf))?;
self.metrics.bytes_sent.inc_by(u64::cast_from(n));
Poll::Ready(Ok(n))
}
fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<io::Result<()>> {
Pin::new(&mut self.inner).poll_flush(cx)
}
fn poll_shutdown(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<io::Result<()>> {
Pin::new(&mut self.inner).poll_shutdown(cx)
}
}
#[async_trait]
impl<'a, A> AsyncReady for MeteredConn<'a, A>
where
A: AsyncRead + AsyncWrite + AsyncReady + Sync + Unpin,
{
async fn ready(&self, interest: Interest) -> io::Result<Ready> {
let ready = self.inner.ready(interest);
ready.await
}
}
#[derive(Debug)]
pub enum Conn<A> {
Unencrypted(A),
Ssl(SslStream<A>),
}
impl<A> AsyncRead for Conn<A>
where
A: AsyncRead + AsyncWrite + Unpin,
{
fn poll_read(
self: Pin<&mut Self>,
cx: &mut Context,
buf: &mut ReadBuf,
) -> Poll<io::Result<()>> {
match self.get_mut() {
Conn::Unencrypted(inner) => Pin::new(inner).poll_read(cx, buf),
Conn::Ssl(inner) => Pin::new(inner).poll_read(cx, buf),
}
}
}
impl<A> AsyncWrite for Conn<A>
where
A: AsyncRead + AsyncWrite + Unpin,
{
fn poll_write(self: Pin<&mut Self>, cx: &mut Context, buf: &[u8]) -> Poll<io::Result<usize>> {
match self.get_mut() {
Conn::Unencrypted(inner) => Pin::new(inner).poll_write(cx, buf),
Conn::Ssl(inner) => Pin::new(inner).poll_write(cx, buf),
}
}
fn poll_flush(self: Pin<&mut Self>, cx: &mut Context) -> Poll<io::Result<()>> {
match self.get_mut() {
Conn::Unencrypted(inner) => Pin::new(inner).poll_flush(cx),
Conn::Ssl(inner) => Pin::new(inner).poll_flush(cx),
}
}
fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context) -> Poll<io::Result<()>> {
match self.get_mut() {
Conn::Unencrypted(inner) => Pin::new(inner).poll_shutdown(cx),
Conn::Ssl(inner) => Pin::new(inner).poll_shutdown(cx),
}
}
}
#[async_trait]
impl<A> AsyncReady for Conn<A>
where
A: AsyncRead + AsyncWrite + AsyncReady + Sync + Unpin,
{
async fn ready(&self, interest: Interest) -> io::Result<Ready> {
match self {
Conn::Unencrypted(inner) => inner.ready(interest).await,
Conn::Ssl(inner) => inner.ready(interest).await,
}
}
}