Merge pull request rust-postgres#777 from petrosagg/buffered-io

tokio-postgres: buffer sockets to avoid excessive syscalls

Author: sfackler

postgres-native-tls/src/lib.rs

@@ -51,7 +51,7 @@ use std::future::Future;
 use std::io;
 use std::pin::Pin;
 use std::task::{Context, Poll};
-use tokio::io::{AsyncRead, AsyncWrite, ReadBuf};
+use tokio::io::{AsyncRead, AsyncWrite, BufReader, ReadBuf};
 use tokio_postgres::tls;
 #[cfg(feature = "runtime")]
 use tokio_postgres::tls::MakeTlsConnect;
@@ -115,6 +115,7 @@ where
     type Future = Pin<Box<dyn Future<Output = Result<TlsStream<S>, native_tls::Error>> + Send>>;
 
     fn connect(self, stream: S) -> Self::Future {
+        let stream = BufReader::with_capacity(8192, stream);
         let future = async move {
             let stream = self.connector.connect(&self.domain, stream).await?;
 
@@ -126,7 +127,7 @@ where
 }
 
 /// The stream returned by `TlsConnector`.
-pub struct TlsStream<S>(tokio_native_tls::TlsStream<S>);
+pub struct TlsStream<S>(tokio_native_tls::TlsStream<BufReader<S>>);
 
 impl<S> AsyncRead for TlsStream<S>
 where

postgres-openssl/src/lib.rs

@@ -57,7 +57,7 @@ use std::pin::Pin;
 #[cfg(feature = "runtime")]
 use std::sync::Arc;
 use std::task::{Context, Poll};
-use tokio::io::{AsyncRead, AsyncWrite, ReadBuf};
+use tokio::io::{AsyncRead, AsyncWrite, BufReader, ReadBuf};
 use tokio_openssl::SslStream;
 use tokio_postgres::tls;
 #[cfg(feature = "runtime")]
@@ -140,6 +140,7 @@ where
     type Future = Pin<Box<dyn Future<Output = Result<TlsStream<S>, Self::Error>> + Send>>;
 
     fn connect(self, stream: S) -> Self::Future {
+        let stream = BufReader::with_capacity(8192, stream);
         let future = async move {
             let ssl = self.ssl.into_ssl(&self.domain)?;
             let mut stream = SslStream::new(ssl, stream)?;
@@ -182,7 +183,7 @@ impl Error for ConnectError {
 }
 
 /// The stream returned by `TlsConnector`.
-pub struct TlsStream<S>(SslStream<S>);
+pub struct TlsStream<S>(SslStream<BufReader<S>>);
 
 impl<S> AsyncRead for TlsStream<S>
 where