RUST-1337 Use tokio's AsyncRead and AsyncWrite traits (#669)

This fixes a performance regression that resulted from upgrading tokio-rustls and/or rustls.

Author: patrickfreed

Cargo.toml

@@ -59,7 +59,6 @@ chrono = "0.4.7"
 derivative = "2.1.1"
 flate2 = { version = "1.0", optional = true }
 futures-core = "0.3.14"
-futures-io = "0.3.14"
 futures-util = { version = "0.3.14", features = ["io"] }
 futures-executor = "0.3.14"
 hex = "0.4.0"

src/bson_util/mod.rs

@@ -1,12 +1,16 @@
-use std::{convert::TryFrom, io::Read, time::Duration};
+use std::{
+    convert::TryFrom,
+    io::{Read, Write},
+    time::Duration,
+};
 
 use bson::RawBsonRef;
 use serde::{de::Error as SerdeDeError, ser, Deserialize, Deserializer, Serialize, Serializer};
 
 use crate::{
     bson::{doc, Bson, Document},
     error::{ErrorKind, Result},
-    runtime::{SyncLittleEndianRead, SyncLittleEndianWrite},
+    runtime::SyncLittleEndianRead,
 };
 
 /// Coerce numeric types into an `i64` if it would be lossless to do so. If this Bson is not numeric
@@ -203,10 +207,10 @@ fn num_decimal_digits(mut n: usize) -> u64 {
 
 /// Read a document's raw BSON bytes from the provided reader.
 pub(crate) fn read_document_bytes<R: Read>(mut reader: R) -> Result<Vec<u8>> {
-    let length = reader.read_i32()?;
+    let length = reader.read_i32_sync()?;
 
     let mut bytes = Vec::with_capacity(length as usize);
-    bytes.write_i32(length)?;
+    bytes.write_all(&length.to_le_bytes())?;
 
     reader.take(length as u64 - 4).read_to_end(&mut bytes)?;
 

src/cmap/conn/wire/header.rs

@@ -1,10 +1,6 @@
-use futures_io::{AsyncRead, AsyncWrite};
-use futures_util::AsyncWriteExt;
+use tokio::io::{AsyncReadExt, AsyncWrite, AsyncWriteExt};
 
-use crate::{
-    error::{ErrorKind, Result},
-    runtime::AsyncLittleEndianRead,
-};
+use crate::error::{ErrorKind, Result};
 
 /// The wire protocol op codes.
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
@@ -54,11 +50,13 @@ impl Header {
     }
 
     /// Reads bytes from `r` and deserializes them into a header.
-    pub(crate) async fn read_from<R: AsyncRead + Unpin + Send>(reader: &mut R) -> Result<Self> {
-        let length = reader.read_i32().await?;
-        let request_id = reader.read_i32().await?;
-        let response_to = reader.read_i32().await?;
-        let op_code = OpCode::from_i32(reader.read_i32().await?)?;
+    pub(crate) async fn read_from<R: tokio::io::AsyncRead + Unpin + Send>(
+        reader: &mut R,
+    ) -> Result<Self> {
+        let length = reader.read_i32_le().await?;
+        let request_id = reader.read_i32_le().await?;
+        let response_to = reader.read_i32_le().await?;
+        let op_code = OpCode::from_i32(reader.read_i32_le().await?)?;
         Ok(Self {
             length,
             request_id,

src/cmap/conn/wire/message.rs

@@ -1,12 +1,7 @@
 use std::io::Read;
 
 use bitflags::bitflags;
-use futures_io::AsyncWrite;
-use futures_util::{
-    io::{BufReader, BufWriter},
-    AsyncReadExt,
-    AsyncWriteExt,
-};
+use tokio::io::{AsyncReadExt, AsyncWrite, AsyncWriteExt, BufReader, BufWriter};
 
 use super::header::{Header, OpCode};
 use crate::{
@@ -16,7 +11,7 @@ use crate::{
         Command,
     },
     error::{Error, ErrorKind, Result},
-    runtime::{AsyncLittleEndianWrite, AsyncStream, SyncLittleEndianRead},
+    runtime::{AsyncStream, SyncLittleEndianRead},
 };
 
 use crate::compression::{Compressor, Decoder};
@@ -129,7 +124,7 @@ impl Message {
         let mut reader = buf.as_slice();
 
         // Read original opcode (should be OP_MSG)
-        let original_opcode = reader.read_i32()?;
+        let original_opcode = reader.read_i32_sync()?;
         if original_opcode != OpCode::Message as i32 {
             return Err(ErrorKind::InvalidResponse {
                 message: format!(
@@ -142,10 +137,10 @@ impl Message {
         }
 
         // Read uncompressed size
-        let uncompressed_size = reader.read_i32()?;
+        let uncompressed_size = reader.read_i32_sync()?;
 
         // Read compressor id
-        let compressor_id: u8 = reader.read_u8()?;
+        let compressor_id: u8 = reader.read_u8_sync()?;
 
         // Get decoder
         let decoder = Decoder::from_u8(compressor_id)?;
@@ -178,7 +173,7 @@ impl Message {
         mut length_remaining: i32,
         header: &Header,
     ) -> Result<Self> {
-        let flags = MessageFlags::from_bits_truncate(reader.read_u32()?);
+        let flags = MessageFlags::from_bits_truncate(reader.read_u32_sync()?);
         length_remaining -= std::mem::size_of::<u32>() as i32;
 
         let mut count_reader = SyncCountReader::new(&mut reader);
@@ -193,7 +188,7 @@ impl Message {
         let mut checksum = None;
 
         if length_remaining == 4 && flags.contains(MessageFlags::CHECKSUM_PRESENT) {
-            checksum = Some(reader.read_u32()?);
+            checksum = Some(reader.read_u32_sync()?);
         } else if length_remaining != 0 {
             return Err(ErrorKind::InvalidResponse {
                 message: format!(
@@ -241,11 +236,11 @@ impl Message {
         };
 
         header.write_to(&mut writer).await?;
-        writer.write_u32(self.flags.bits()).await?;
+        writer.write_u32_le(self.flags.bits()).await?;
         writer.write_all(&sections_bytes).await?;
 
         if let Some(checksum) = self.checksum {
-            writer.write_u32(checksum).await?;
+            writer.write_u32_le(checksum).await?;
         }
 
         writer.flush().await?;
@@ -292,9 +287,9 @@ impl Message {
         // Write header
         header.write_to(&mut writer).await?;
         // Write original (pre-compressed) opcode (always OP_MSG)
-        writer.write_i32(OpCode::Message as i32).await?;
+        writer.write_i32_le(OpCode::Message as i32).await?;
         // Write uncompressed size
-        writer.write_i32(uncompressed_len as i32).await?;
+        writer.write_i32_le(uncompressed_len as i32).await?;
         // Write compressor id
         writer.write_u8(compressor_id).await?;
         // Write compressed message
@@ -329,15 +324,15 @@ pub(crate) enum MessageSection {
 impl MessageSection {
     /// Reads bytes from `reader` and deserializes them into a MessageSection.
     fn read<R: Read>(reader: &mut R) -> Result<Self> {
-        let payload_type = reader.read_u8()?;
+        let payload_type = reader.read_u8_sync()?;
 
         if payload_type == 0 {
             return Ok(MessageSection::Document(bson_util::read_document_bytes(
                 reader,
             )?));
         }
 
-        let size = reader.read_i32()?;
+        let size = reader.read_i32_sync()?;
         let mut length_remaining = size - std::mem::size_of::<i32>() as i32;
 
         let mut identifier = String::new();
@@ -385,7 +380,7 @@ impl MessageSection {
                 // Write payload type.
                 writer.write_u8(1).await?;
 
-                writer.write_i32(*size).await?;
+                writer.write_i32_le(*size).await?;
                 super::util::write_cstring(writer, identifier).await?;
 
                 for doc in documents {

src/cmap/conn/wire/util.rs

@@ -3,9 +3,8 @@ use std::{
     sync::atomic::{AtomicI32, Ordering},
 };
 
-use futures_io::{self, AsyncWrite};
-use futures_util::AsyncWriteExt;
 use lazy_static::lazy_static;
+use tokio::io::{AsyncWrite, AsyncWriteExt};
 
 use crate::error::Result;
 

src/runtime/async_read_ext.rs

@@ -1,12 +1,11 @@
 mod acknowledged_message;
-mod async_read_ext;
-mod async_write_ext;
 mod http;
 #[cfg(feature = "async-std-runtime")]
 mod interval;
 mod join_handle;
 mod resolver;
 mod stream;
+mod sync_read_ext;
 #[cfg(feature = "openssl-tls")]
 mod tls_openssl;
 #[cfg_attr(feature = "openssl-tls", allow(unused))]
@@ -16,11 +15,10 @@ use std::{future::Future, net::SocketAddr, time::Duration};
 
 pub(crate) use self::{
     acknowledged_message::AcknowledgedMessage,
-    async_read_ext::{AsyncLittleEndianRead, SyncLittleEndianRead},
-    async_write_ext::{AsyncLittleEndianWrite, SyncLittleEndianWrite},
     join_handle::AsyncJoinHandle,
     resolver::AsyncResolver,
     stream::AsyncStream,
+    sync_read_ext::SyncLittleEndianRead,
 };
 use crate::{error::Result, options::ServerAddress};
 pub(crate) use http::HttpClient;