feat: zero-copy preliminary step

duva-client/src/broker/mod.rs

@@ -14,7 +14,8 @@ use duva::prelude::tokio::sync::mpsc::Receiver;
 use duva::prelude::tokio::sync::mpsc::Sender;
 use duva::prelude::uuid::Uuid;
 use duva::prelude::{
-    ConnectionRequest, ConnectionRequests, ConnectionResponse, ConnectionResponses, ReplicationId,
+    BytesMut, ConnectionRequest, ConnectionRequests, ConnectionResponse, ConnectionResponses,
+    ReplicationId,
 };
 use duva::prelude::{PeerIdentifier, tokio};
 use duva::prelude::{Topology, anyhow};
@@ -115,8 +116,10 @@ impl Broker {
         conn_req: ConnectionRequest,
     ) -> anyhow::Result<(ServerStreamReader, ServerStreamWriter, ConnectionResponse)> {
         stream.serialized_write(ConnectionRequests::Authenticate(conn_req)).await?; // client_id not exist
-
-        let ConnectionResponses::Authenticated(response) = stream.deserialized_read().await? else {
+        let mut buffer = BytesMut::new();
+        let ConnectionResponses::Authenticated(response) =
+            stream.deserialized_read(&mut buffer).await?
+        else {
             bail!("Authentication failed");
         };
 
@@ -161,7 +164,10 @@ impl Broker {
     async fn discover_leader_from(&mut self, follower: PeerIdentifier) -> anyhow::Result<()> {
         let mut stream = TcpStream::connect(follower.as_str()).await?;
         stream.serialized_write(ConnectionRequests::Discovery).await?;
-        let ConnectionResponses::Discovery { leader_id } = stream.deserialized_read().await? else {
+        let mut buffer = BytesMut::new();
+        let ConnectionResponses::Discovery { leader_id } =
+            stream.deserialized_read(&mut buffer).await?
+        else {
             bail!("Discovery failed!");
         };
 

duva-client/src/broker/read_stream.rs

@@ -1,8 +1,8 @@
 use crate::broker::BrokerMessage;
 use duva::domains::TSerdeRead;
 
-use duva::prelude::ReplicationId;
 use duva::prelude::tokio::{self, net::tcp::OwnedReadHalf, sync::oneshot};
+use duva::prelude::{BytesMut, ReplicationId};
 
 pub struct ServerStreamReader(pub(crate) OwnedReadHalf);
 impl ServerStreamReader {
@@ -15,9 +15,9 @@ impl ServerStreamReader {
 
         let future = async move {
             let controller_sender = controller_sender.clone();
-
             loop {
-                match self.0.deserialized_reads().await {
+                let mut buffer = BytesMut::new();
+                match self.0.deserialized_reads(&mut buffer).await {
                     Ok(server_responses) => {
                         for res in server_responses {
                             if controller_sender

duva/src/adapters/io/tokio_stream.rs

@@ -6,6 +6,9 @@ use crate::domains::{
     TSerdeWrite,
 };
 
+use async_trait::async_trait;
+use bincode::BorrowDecode;
+
 use bytes::BytesMut;
 use std::fmt::Debug;
 use std::io::ErrorKind;
@@ -65,7 +68,8 @@ impl<T: AsyncReadExt + std::marker::Unpin + Sync + Send + Debug + 'static> TSerd
         Ok(parsed_values)
     }
     async fn receive_connection_msgs(&mut self) -> Result<String, IoError> {
-        self.deserialized_read().await
+        let mut buffer = BytesMut::new();
+        self.deserialized_read(&mut buffer).await
     }
 }
 
@@ -92,35 +96,52 @@ impl<T: AsyncWriteExt + std::marker::Unpin + Sync + Send + Debug + 'static> TSer
     }
 }
 
-impl<T: AsyncReadExt + std::marker::Unpin + Sync + Send + Debug + 'static> TSerdeRead for T {
-    async fn deserialized_read<U>(&mut self) -> Result<U, IoError>
+#[async_trait]
+impl<T> TSerdeRead for T
+where
+    T: AsyncReadExt + Unpin + Sync + Send + Debug + 'static,
+{
+    async fn deserialized_read<'a, U>(&mut self, buffer: &'a mut BytesMut) -> Result<U, IoError>
     where
-        U: bincode::Decode<()>,
+        U: BorrowDecode<'a, ()> + Send,
     {
-        let mut buffer = BytesMut::with_capacity(INITIAL_CAPACITY);
-        self.read_bytes(&mut buffer).await?;
+        self.read_bytes(buffer).await?;
 
-        let (request, _) = bincode::decode_from_slice(&buffer, SERDE_CONFIG)
-            .map_err(|e| IoError::Custom(e.to_string()))?;
+        let (request, _) = bincode::borrow_decode_from_slice(&buffer[..], SERDE_CONFIG).unwrap();
 
         Ok(request)
     }
 
-    async fn deserialized_reads<U>(&mut self) -> Result<Vec<U>, IoError>
+    async fn deserialized_reads<'a, U>(
+        &mut self,
+        buffer: &'a mut BytesMut,
+    ) -> Result<Vec<U>, IoError>
     where
-        U: bincode::Decode<()>,
+        U: BorrowDecode<'a, ()> + Send,
     {
-        let mut buffer = BytesMut::with_capacity(INITIAL_CAPACITY);
-        self.read_bytes(&mut buffer).await?;
+        // Read data from socket into buffer
+        self.read_bytes(buffer).await?;
 
         let mut parsed_values = Vec::new();
 
-        while !buffer.is_empty() {
-            let (request, size) = bincode::decode_from_slice(&buffer, SERDE_CONFIG)
-                .map_err(|e| IoError::Custom(e.to_string()))?;
-            parsed_values.push(request);
-            buffer = buffer.split_off(size);
+        // Zero-copy slicing logic
+        let mut slice = &buffer[..];
+
+        // Note: In a real protocol, you need a loop that checks if
+        // there is enough data for a full frame before decoding.
+        // This simple loop assumes the buffer contains perfect packets.
+        while !slice.is_empty() {
+            match bincode::borrow_decode_from_slice(slice, SERDE_CONFIG) {
+                Ok((request, size)) => {
+                    parsed_values.push(request);
+                    slice = &slice[size..];
+                },
+                Err(_) => {
+                    break;
+                },
+            }
         }
+
         Ok(parsed_values)
     }
 }
@@ -226,7 +247,8 @@ pub mod test_tokio_stream_impl {
         let mut mock = MockAsyncStream::new(vec![encoded_msg.into()]);
 
         // 2. Act
-        let result: Result<Vec<TestMessage>, IoError> = mock.deserialized_reads().await;
+        let mut buffer = BytesMut::new();
+        let result: Result<Vec<TestMessage>, IoError> = mock.deserialized_reads(&mut buffer).await;
 
         // 3. Assert
         let deserialized = result.unwrap();
@@ -247,7 +269,8 @@ pub mod test_tokio_stream_impl {
         let mut mock = MockAsyncStream::new(vec![raw_data]);
 
         // 2. Act
-        let result: Result<Vec<TestMessage>, IoError> = mock.deserialized_reads().await;
+        let mut buffer = BytesMut::new();
+        let result: Result<Vec<TestMessage>, IoError> = mock.deserialized_reads(&mut buffer).await;
 
         // 3. Assert
         let deserialized = result.unwrap();

duva/src/domains/interface.rs

@@ -7,6 +7,7 @@ use crate::domains::{
         connections::connection_types::{ReadConnected, WriteConnected},
     },
 };
+use bincode::BorrowDecode;
 use bytes::BytesMut;
 
 #[async_trait::async_trait]
@@ -33,14 +34,18 @@ pub trait TSerdeWrite {
     ) -> impl std::future::Future<Output = Result<(), IoError>> + Send;
 }
 
+#[async_trait::async_trait]
 pub trait TSerdeRead {
-    fn deserialized_read<U: bincode::Decode<()>>(
-        &mut self,
-    ) -> impl std::future::Future<Output = Result<U, IoError>> + Send;
+    async fn deserialized_read<'a, U>(&mut self, buffer: &'a mut BytesMut) -> Result<U, IoError>
+    where
+        U: BorrowDecode<'a, ()> + Send; // 'U' lives as long as 'buffer'
 
-    fn deserialized_reads<U: bincode::Decode<()>>(
+    async fn deserialized_reads<'a, U>(
         &mut self,
-    ) -> impl std::future::Future<Output = Result<Vec<U>, IoError>> + Send;
+        buffer: &'a mut BytesMut,
+    ) -> Result<Vec<U>, IoError>
+    where
+        U: BorrowDecode<'a, ()> + Send;
 }
 
 pub(crate) trait TAsyncReadWrite {

duva/src/lib.rs

@@ -12,6 +12,7 @@ use crate::domains::replications::*;
 use crate::domains::{TSerdeRead, TSerdeWrite};
 use crate::signals::SignalHandler;
 use anyhow::{Context, Result};
+use bytes::BytesMut;
 pub use config::Environment;
 use domains::IoError;
 use domains::caches::cache_manager::CacheManager;
@@ -235,7 +236,8 @@ impl StartUpFacade {
     async fn handle_client_stream(&self, stream: tokio::net::TcpStream) -> anyhow::Result<()> {
         let (mut read_half, write_half) = stream.into_split();
         let mut writer = ClientStreamWriter(write_half);
-        let request = read_half.deserialized_read().await?;
+        let mut buffer = BytesMut::new();
+        let request = read_half.deserialized_read(&mut buffer).await?;
 
         match request {
             ConnectionRequests::Discovery => {

duva/src/presentation/clients/authenticate.rs

@@ -19,18 +19,18 @@ impl ConnectionRequest {
         Ok((client_id.to_string(), self.request_id))
     }
 }
-#[derive(Debug, Clone, PartialEq, Eq, bincode::Decode, bincode::Encode)]
+#[derive(Debug, Clone, PartialEq, Eq, bincode::BorrowDecode, bincode::Encode)]
 pub enum ConnectionRequests {
     Discovery,
     Authenticate(ConnectionRequest),
 }
-#[derive(Debug, Clone, bincode::Decode, bincode::Encode)]
+#[derive(Debug, Clone, bincode::BorrowDecode, bincode::Encode)]
 pub enum ConnectionResponses {
     Discovery { leader_id: PeerIdentifier },
     Authenticated(ConnectionResponse),
 }
 
-#[derive(Debug, Clone, Default, bincode::Decode, bincode::Encode)]
+#[derive(Debug, Clone, Default, bincode::BorrowDecode, bincode::Encode)]
 pub struct ConnectionResponse {
     pub client_id: String,
     pub request_id: u64,

duva/src/presentation/clients/request.rs

@@ -12,19 +12,19 @@ use anyhow::Context;
 use chrono::{DateTime, Utc};
 use std::str::FromStr;
 
-#[derive(Debug, Clone, PartialEq, Eq, bincode::Encode, bincode::Decode)]
+#[derive(Debug, Clone, PartialEq, Eq, bincode::Encode, bincode::BorrowDecode)]
 pub struct SessionRequest {
     pub conn_offset: u64,
     pub action: ClientAction,
 }
 
-#[derive(Clone, Debug, PartialEq, Eq, bincode::Encode, bincode::Decode)]
+#[derive(Clone, Debug, PartialEq, Eq, bincode::Encode, bincode::BorrowDecode)]
 pub enum ClientAction {
     NonMutating(NonMutatingAction),
     Mutating(LogEntry),
 }
 
-#[derive(Clone, Debug, PartialEq, Eq, bincode::Encode, bincode::Decode)]
+#[derive(Clone, Debug, PartialEq, Eq, bincode::Encode, bincode::BorrowDecode)]
 pub enum NonMutatingAction {
     Ping,
     Echo(String),
@@ -306,7 +306,7 @@ pub struct ClientRequest {
     pub(crate) conn_id: String,
 }
 
-#[derive(Clone, Debug, bincode::Decode, bincode::Encode)]
+#[derive(Clone, Debug, bincode::BorrowDecode, bincode::Encode)]
 pub enum ServerResponse {
     WriteRes { res: QueryIO, log_index: u64, conn_offset: u64 },
     ReadRes { res: QueryIO, conn_offset: u64 },

duva/src/presentation/clients/stream.rs

@@ -11,6 +11,7 @@ use crate::prelude::ConnectionResponse;
 use crate::prelude::ConnectionResponses;
 use crate::presentation::clients::request::{ClientAction, ServerResponse, SessionRequest};
 
+use bytes::BytesMut;
 use tokio::{
     net::tcp::{OwnedReadHalf, OwnedWriteHalf},
     sync::mpsc::Sender,
@@ -31,7 +32,8 @@ impl ClientStreamReader {
     ) {
         loop {
             // * extract queries
-            let query_ios = self.r.deserialized_reads::<SessionRequest>().await;
+            let mut buffer = BytesMut::new();
+            let query_ios = self.r.deserialized_reads::<SessionRequest>(&mut buffer).await;
             if let Err(err) = query_ios {
                 info!("{}", err);
                 if err.should_break() {