mset / mget commands (cli currently only supports mget)

src/bin/cli.rs

@@ -39,6 +39,13 @@ enum Commands {
     Persist {
         key: String,
     },
+
+    #[command(name = "mget")]
+    MGet {
+        #[arg(num_args = 1..)]
+        keys: Vec<String>,
+    },
+
     #[command(aliases = &["exit", "q"])]
     Quit,
 }
@@ -108,6 +115,13 @@ async fn main() -> Result<()> {
                 let value = client.persist(&key).await?;
                 println!("{value:?}");
             }
+
+            Commands::MGet { keys } => {
+                let value = client.m_get(keys).await?;
+
+                println!("{value:?}");
+            }
+
             Commands::Quit => break,
         }
     }

src/buffer.rs

@@ -0,0 +1,164 @@
+use std::num::TryFromIntError;
+
+use bytes::{Buf, BufMut, Bytes};
+
+use crate::{Result, errors::AppError};
+
+pub trait ArchiveBuf<B: Buf> {
+    fn try_get_string(&mut self) -> Result<String>;
+    fn try_get_short_string(&mut self) -> Result<String>;
+    fn try_get_bytes(&mut self) -> Result<Bytes>;
+    fn try_get_bool(&mut self) -> Result<bool>;
+    fn try_get_option<T, F, E>(&mut self, f: F) -> Result<Option<T>>
+    where
+        T: Sized,
+        F: FnOnce(&mut B) -> std::result::Result<T, E>,
+        AppError: From<E>;
+    fn try_get_vec<T, F, E>(&mut self, f: F) -> Result<Vec<T>>
+    where
+        T: Sized,
+        F: FnMut(&mut B) -> std::result::Result<T, E>,
+        AppError: From<E>;
+}
+
+pub trait ArchiveBufMut<B: Buf> {
+    fn put_string(&mut self, s: &str) -> Result<()>;
+    fn put_short_string(&mut self, s: &str) -> Result<()>;
+    fn put_bytes_with_length<T: AsRef<[u8]>>(&mut self, bytes: T);
+    fn put_option<T, F>(&mut self, value: Option<T>, f: F)
+    where
+        T: Sized,
+        F: FnOnce(&mut B, T);
+    fn try_put_vec<T, F, V, E>(&mut self, value: V, f: F) -> Result<()>
+    where
+        T: Sized,
+        F: FnMut(&T, &mut B) -> std::result::Result<(), E>,
+        V: AsRef<[T]>,
+        AppError: From<E> + From<TryFromIntError>;
+}
+
+impl<B: Buf> ArchiveBuf<B> for B {
+    fn try_get_string(&mut self) -> Result<String> {
+        let len = self.try_get_u32()? as usize;
+
+        if self.remaining() < len {
+            return Err(AppError::IncompleteBuffer);
+        }
+
+        Ok(String::from_utf8(self.copy_to_bytes(len).to_vec())?)
+    }
+
+    fn try_get_short_string(&mut self) -> Result<String> {
+        let len = self.try_get_u16()? as usize;
+
+        if self.remaining() < len {
+            return Err(AppError::IncompleteBuffer);
+        }
+
+        Ok(String::from_utf8(self.copy_to_bytes(len).to_vec())?)
+    }
+
+    fn try_get_bytes(&mut self) -> Result<Bytes> {
+        let len = self.try_get_u32()? as usize;
+
+        if self.remaining() < len {
+            return Err(AppError::IncompleteBuffer);
+        }
+
+        let data = self.copy_to_bytes(len);
+
+        Ok(data)
+    }
+
+    fn try_get_bool(&mut self) -> Result<bool> {
+        Ok(match self.try_get_u8()? {
+            1 => true,
+            0 => false,
+            _ => return Err(AppError::UnexpectedData),
+        })
+    }
+
+    fn try_get_option<T, F, E>(&mut self, f: F) -> Result<Option<T>>
+    where
+        T: Sized,
+        F: FnOnce(&mut B) -> std::result::Result<T, E>,
+        AppError: From<E>,
+    {
+        if !self.try_get_bool()? {
+            return Ok(None);
+        }
+
+        Ok(Some(f(self)?))
+    }
+
+    fn try_get_vec<T, F, E>(&mut self, mut f: F) -> Result<Vec<T>>
+    where
+        T: Sized,
+        F: FnMut(&mut B) -> std::result::Result<T, E>,
+        AppError: From<E>,
+    {
+        let len = self.try_get_u16()?;
+
+        let mut vec = Vec::with_capacity(len.into());
+
+        for _ in 0..len {
+            vec.push(f(self)?);
+        }
+
+        Ok(vec)
+    }
+}
+
+impl<B: Buf + BufMut> ArchiveBufMut<B> for B {
+    fn put_string(&mut self, s: &str) -> Result<()> {
+        self.put_u32(s.len().try_into()?);
+        self.put_slice(s.as_bytes());
+
+        Ok(())
+    }
+
+    fn put_short_string(&mut self, s: &str) -> Result<()> {
+        self.put_u16(s.len().try_into()?);
+        self.put_slice(s.as_bytes());
+
+        Ok(())
+    }
+
+    fn put_bytes_with_length<T: AsRef<[u8]>>(&mut self, bytes: T) {
+        let bytes = bytes.as_ref();
+
+        self.put_u32(bytes.len() as u32);
+        self.put_slice(bytes);
+    }
+
+    fn put_option<T, F>(&mut self, value: Option<T>, f: F)
+    where
+        T: Sized,
+        F: FnOnce(&mut B, T),
+    {
+        let Some(value) = value else {
+            self.put_u8(0);
+            return;
+        };
+
+        self.put_u8(1);
+        f(self, value);
+    }
+
+    fn try_put_vec<T, F, V, E>(&mut self, vec: V, mut f: F) -> Result<()>
+    where
+        T: Sized,
+        F: FnMut(&T, &mut B) -> std::result::Result<(), E>,
+        V: AsRef<[T]>,
+        AppError: From<E> + From<TryFromIntError>,
+    {
+        let vec = vec.as_ref();
+        self.put_u16(vec.len().try_into()?);
+
+        for element in vec {
+            f(element, self)?;
+        }
+
+        Ok(())
+    }
+}

src/client.rs

@@ -1,7 +1,16 @@
-use bytes::{Buf, BufMut as _, Bytes, BytesMut};
+use bytes::{Buf, Bytes, BytesMut};
 use tokio::net::{TcpStream, ToSocketAddrs};
 
-use crate::{Result, connection::Connection, errors::AppError};
+use crate::{
+    Result,
+    buffer::ArchiveBuf,
+    commands::{
+        delete::Delete, expire::Expire, get::Get, has::Has, m_get::MGet, m_set::MSet,
+        persist::Persist, set::Set, ttl::Ttl,
+    },
+    connection::Connection,
+    errors::AppError,
+};
 
 pub struct Client {
     connection: Connection,
@@ -19,35 +28,16 @@ impl Client {
     pub async fn get(&mut self, key: &str) -> Result<Option<Bytes>> {
         let mut bytes = BytesMut::new();
 
-        bytes.put_u16(3);
-        bytes.put_slice(b"get");
-
-        let key_length: u16 = key
-            .len()
-            .try_into()
-            .map_err(|_| AppError::KeyLength(key.len()))?;
-
-        bytes.put_u16(key_length);
-        bytes.put_slice(key.as_bytes());
+        let cmd = Get::new(key.to_owned());
+        cmd.put(&mut bytes)?;
 
         self.connection.write(bytes.into()).await?;
 
         let mut r = self.get_response().await?;
-        let response = match r.try_get_u8()? {
-            0 => None,
-            1 => {
-                let len = r.try_get_u32()? as usize;
 
-                if r.remaining() < len {
-                    return Err(AppError::InvalidCommandResponse);
-                }
+        let value = r.try_get_option(ArchiveBuf::try_get_bytes)?;
 
-                Some(r.copy_to_bytes(len))
-            }
-            _ => return Err(AppError::InvalidCommandResponse),
-        };
-
-        Ok(response)
+        Ok(value)
     }
 
     pub async fn set(
@@ -56,172 +46,137 @@ impl Client {
         data: &[u8],
         expiration_secs: Option<u64>,
     ) -> Result<()> {
-        let mut bytes = BytesMut::new();
+        let mut buf = BytesMut::new();
 
-        bytes.put_u16(3);
-        bytes.put_slice(b"set");
+        let cmd = Set::new(key.to_owned(), data.into(), expiration_secs);
+        cmd.put(&mut buf)?;
 
-        let key_length: u16 = key
-            .len()
-            .try_into()
-            .map_err(|_| AppError::KeyLength(key.len()))?;
-
-        bytes.put_u16(key_length);
-        bytes.put_slice(key.as_bytes());
-
-        bytes.put_u32(data.len() as u32);
-        bytes.put_slice(data);
-
-        match expiration_secs {
-            Some(seconds) => {
-                bytes.put_u8(1);
-                bytes.put_u64(seconds);
-            }
-            None => {
-                bytes.put_u8(0);
-            }
-        }
-
-        self.connection.write(bytes.into()).await?;
+        self.connection.write(buf.into()).await?;
 
         let mut r = self.get_response().await?;
 
-        match r.try_get_u8()? {
-            1 => return Ok(()),
-            _ => return Err(AppError::InvalidCommandResponse),
+        if !r.try_get_bool()? {
+            return Err(AppError::InvalidCommandResponse);
         }
+
+        Ok(())
     }
 
     pub async fn delete(&mut self, key: &str) -> Result<Option<Bytes>> {
         let mut bytes = BytesMut::new();
 
-        bytes.put_u16(6);
-        bytes.put_slice(b"delete");
-
-        let key_length: u16 = key
-            .len()
-            .try_into()
-            .map_err(|_| AppError::KeyLength(key.len()))?;
-
-        bytes.put_u16(key_length);
-        bytes.put_slice(key.as_bytes());
+        let cmd = Delete::new(key.to_owned());
+        cmd.put(&mut bytes)?;
 
         self.connection.write(bytes.into()).await?;
 
         let mut r = self.get_response().await?;
 
-        let response = match r.try_get_u8()? {
-            1 => {
-                let len = r.try_get_u32()?;
-                let bytes = r.copy_to_bytes(len as usize);
+        let value = r.try_get_option(ArchiveBuf::try_get_bytes)?;
 
-                Some(bytes)
-            }
-            0 => None,
-            _ => return Err(AppError::InvalidCommandResponse),
-        };
-
-        Ok(response)
+        Ok(value)
     }
 
     pub async fn has(&mut self, key: &str) -> Result<bool> {
         let mut bytes = BytesMut::new();
-        bytes.put_u16(3);
-        bytes.put_slice(b"has");
 
-        let key_length: u16 = key
-            .len()
-            .try_into()
-            .map_err(|_| AppError::KeyLength(key.len()))?;
-
-        bytes.put_u16(key_length);
-        bytes.put_slice(key.as_bytes());
+        let cmd = Has::new(key.to_owned());
+        cmd.put(&mut bytes)?;
 
         self.connection.write(bytes.into()).await?;
 
         let mut r = self.get_response().await?;
 
-        Ok(r.try_get_u8()? == 1)
+        let has = r.try_get_bool()?;
+
+        Ok(has)
     }
 
     pub async fn ttl(&mut self, key: &str) -> Result<Option<u64>> {
         let mut bytes = BytesMut::new();
-        bytes.put_u16(3);
-        bytes.put_slice(b"ttl");
 
-        let key_length: u16 = key
-            .len()
-            .try_into()
-            .map_err(|_| AppError::KeyLength(key.len()))?;
-
-        bytes.put_u16(key_length);
-        bytes.put_slice(key.as_bytes());
+        let cmd = Ttl::new(key.to_owned());
+        cmd.put(&mut bytes)?;
 
         self.connection.write(bytes.into()).await?;
 
         let mut r = self.get_response().await?;
 
-        let ttl = match r.try_get_u8()? {
-            1 => Some(r.try_get_u64()?),
-            0 => None,
-            _ => return Err(AppError::InvalidCommandResponse),
-        };
+        let ttl = r.try_get_option(Bytes::try_get_u64)?;
 
         Ok(ttl)
     }
 
     pub async fn expire(&mut self, key: &str, seconds: u64) -> Result<bool> {
         let mut bytes = BytesMut::new();
-        bytes.put_u16(6);
-        bytes.put_slice(b"expire");
 
-        let key_length: u16 = key
-            .len()
-            .try_into()
-            .map_err(|_| AppError::KeyLength(key.len()))?;
-
-        bytes.put_u16(key_length);
-        bytes.put_slice(key.as_bytes());
-
-        bytes.put_u64(seconds);
+        let cmd = Expire::new(key.to_owned(), seconds);
+        cmd.put(&mut bytes)?;
 
         self.connection.write(bytes.into()).await?;
 
         let mut r = self.get_response().await?;
 
-        let success = match r.try_get_u8()? {
-            1 => true,
-            0 => false,
-            _ => return Err(AppError::InvalidCommandResponse),
-        };
-
-        Ok(success)
+        Ok(r.try_get_bool()?)
     }
 
     pub async fn persist(&mut self, key: &str) -> Result<bool> {
         let mut bytes = BytesMut::new();
-        bytes.put_u16(7);
-        bytes.put_slice(b"persist");
 
-        let key_length: u16 = key
-            .len()
-            .try_into()
-            .map_err(|_| AppError::KeyLength(key.len()))?;
-
-        bytes.put_u16(key_length);
-        bytes.put_slice(key.as_bytes());
+        let cmd = Persist::new(key.to_owned());
+        cmd.put(&mut bytes)?;
 
         self.connection.write(bytes.into()).await?;
 
         let mut r = self.get_response().await?;
 
-        let success = match r.try_get_u8()? {
-            1 => true,
-            0 => false,
-            _ => return Err(AppError::InvalidCommandResponse),
-        };
+        Ok(r.try_get_bool()?)
+    }
 
-        Ok(success)
+    pub async fn m_set(
+        &mut self,
+        keys: Vec<&str>,
+        data: Vec<&[u8]>,
+        expirations: Vec<Option<u64>>,
+    ) -> Result<()> {
+        let mut bytes = BytesMut::new();
+
+        let len = keys.len().min(data.len()).min(expirations.len());
+
+        let mut sets = Vec::with_capacity(len);
+
+        for i in 0..len {
+            sets.push(Set::new(keys[i].to_owned(), data[i].into(), expirations[i]));
+        }
+
+        let cmd = MSet::new(sets);
+        cmd.put(&mut bytes)?;
+
+        self.connection.write(bytes.into()).await?;
+
+        let mut r = self.get_response().await?;
+
+        if !r.try_get_bool()? {
+            return Err(AppError::InvalidCommandResponse);
+        }
+
+        Ok(())
+    }
+
+    pub async fn m_get(&mut self, keys: Vec<String>) -> Result<Vec<Option<Bytes>>> {
+        let mut bytes = BytesMut::new();
+
+        let gets: Vec<Get> = keys.into_iter().map(Get::new).collect();
+        let cmd = MGet::new(gets);
+        cmd.put(&mut bytes)?;
+
+        self.connection.write(bytes.into()).await?;
+
+        let mut r = self.get_response().await?;
+
+        let values = r.try_get_vec(|b| b.try_get_option(ArchiveBuf::try_get_bytes))?;
+
+        Ok(values)
     }
 
     async fn get_response(&mut self) -> Result<Bytes> {

src/commands/delete.rs

@@ -1,8 +1,13 @@
 use std::io::Cursor;
 
-use bytes::{Buf as _, BufMut as _, BytesMut};
+use bytes::BytesMut;
 
-use crate::{Result, connection::Connection, database::Database, errors::AppError};
+use crate::{
+    Result,
+    buffer::{ArchiveBuf as _, ArchiveBufMut},
+    connection::Connection,
+    database::Database,
+};
 
 #[derive(Debug, Clone)]
 pub struct Delete {
@@ -10,33 +15,33 @@ pub struct Delete {
 }
 
 impl Delete {
+    pub fn new(key: String) -> Self {
+        Self { key }
+    }
+
     pub async fn execute(self, db: &Database, connection: &mut Connection) -> Result<()> {
         let value = db.delete(&self.key).await;
 
         let mut buf = BytesMut::new();
-        match value {
-            Some(v) => {
-                buf.put_u8(1);
-                buf.put_u32(v.len() as u32);
-                buf.put_slice(&v);
-            }
-            None => buf.put_u8(0),
-        }
+        buf.put_option(value, ArchiveBufMut::put_bytes_with_length);
 
         connection.write(buf.into()).await?;
 
         Ok(())
     }
 
-    pub fn parse(bytes: &mut Cursor<&[u8]>) -> Result<Self> {
-        let key_length = bytes.try_get_u16()? as usize;
-
-        if bytes.remaining() < key_length {
-            return Err(AppError::IncompleteCommandBuffer);
-        }
-
-        let key = String::from_utf8(bytes.copy_to_bytes(key_length).to_vec())?;
+    pub fn parse(buf: &mut Cursor<&[u8]>) -> Result<Self> {
+        let key = buf.try_get_short_string()?;
 
         Ok(Self { key })
     }
+
+    pub fn put(&self, buf: &mut BytesMut) -> Result<()> {
+        buf.put_short_string("delete")?;
+        self.put_without_cmd_name(buf)
+    }
+
+    pub fn put_without_cmd_name(&self, buf: &mut BytesMut) -> Result<()> {
+        buf.put_short_string(&self.key)
+    }
 }

src/commands/expire.rs

@@ -1,8 +1,13 @@
 use std::io::Cursor;
 
-use bytes::{Buf as _, Bytes};
+use bytes::{Buf as _, BufMut as _, Bytes, BytesMut};
 
-use crate::{Result, connection::Connection, database::Database, errors::AppError};
+use crate::{
+    Result,
+    buffer::{ArchiveBuf as _, ArchiveBufMut as _},
+    connection::Connection,
+    database::Database,
+};
 
 #[derive(Debug, Clone)]
 pub struct Expire {
@@ -11,27 +16,38 @@ pub struct Expire {
 }
 
 impl Expire {
+    pub fn new(key: String, seconds: u64) -> Self {
+        Self { key, seconds }
+    }
+
     pub async fn execute(self, db: &Database, connection: &mut Connection) -> Result<()> {
-        let value = db.expire(&self.key, self.seconds).await?;
+        let success = db.expire(&self.key, self.seconds).await?;
 
         connection
-            .write(Bytes::from_static(if value { &[1] } else { &[0] }))
+            .write(Bytes::from_static(if success { &[1] } else { &[0] }))
             .await?;
 
         Ok(())
     }
 
-    pub fn parse(bytes: &mut Cursor<&[u8]>) -> Result<Self> {
-        let key_length = bytes.try_get_u16()? as usize;
-
-        if bytes.remaining() < key_length {
-            return Err(AppError::IncompleteCommandBuffer);
-        }
-
-        let key = String::from_utf8(bytes.copy_to_bytes(key_length).to_vec())?;
-
-        let seconds = bytes.try_get_u64()?;
+    pub fn parse(buf: &mut Cursor<&[u8]>) -> Result<Self> {
+        let key = buf.try_get_short_string()?;
+        let seconds = buf.try_get_u64()?;
 
         Ok(Self { key, seconds })
     }
+
+    pub fn put(&self, buf: &mut BytesMut) -> Result<()> {
+        buf.put_short_string("expire")?;
+
+        self.put_without_cmd_name(buf)
+    }
+
+    pub fn put_without_cmd_name(&self, buf: &mut BytesMut) -> Result<()> {
+        buf.put_short_string(&self.key)?;
+
+        buf.put_u64(self.seconds);
+
+        Ok(())
+    }
 }

src/commands/get.rs

@@ -1,44 +1,47 @@
 use std::io::Cursor;
 
-use bytes::{Buf as _, BufMut as _, BytesMut};
+use bytes::BytesMut;
 
-use crate::{Result, connection::Connection, database::Database, errors::AppError};
+use crate::{
+    Result,
+    buffer::{ArchiveBuf as _, ArchiveBufMut},
+    connection::Connection,
+    database::Database,
+};
 
 #[derive(Debug, Clone)]
 pub struct Get {
-    key: String,
+    pub(super) key: String,
 }
 
 impl Get {
+    pub fn new(key: String) -> Self {
+        Self { key }
+    }
+
     pub async fn execute(self, db: &Database, connection: &mut Connection) -> Result<()> {
         let value = db.get(&self.key).await;
 
         let mut buf = BytesMut::new();
-        match value {
-            Some(v) => {
-                buf.put_u8(1);
-                buf.put_u32(v.len() as u32);
-                buf.put_slice(&v);
-            }
-            None => {
-                buf.put_u8(0);
-            }
-        }
+        buf.put_option(value, ArchiveBufMut::put_bytes_with_length);
 
         connection.write(buf.into()).await?;
 
         Ok(())
     }
 
-    pub fn parse(bytes: &mut Cursor<&[u8]>) -> Result<Self> {
-        let key_length = bytes.try_get_u16()? as usize;
-
-        if bytes.remaining() < key_length {
-            return Err(AppError::IncompleteCommandBuffer);
-        }
-
-        let key = String::from_utf8(bytes.copy_to_bytes(key_length).to_vec())?;
+    pub fn parse(buf: &mut Cursor<&[u8]>) -> Result<Self> {
+        let key = buf.try_get_short_string()?;
 
         Ok(Self { key })
     }
+
+    pub fn put(&self, buf: &mut BytesMut) -> Result<()> {
+        buf.put_short_string("get")?;
+        self.put_without_cmd_name(buf)
+    }
+
+    pub fn put_without_cmd_name(&self, buf: &mut BytesMut) -> Result<()> {
+        buf.put_short_string(&self.key)
+    }
 }

src/commands/has.rs

@@ -1,8 +1,13 @@
 use std::io::Cursor;
 
-use bytes::{Buf as _, Bytes};
+use bytes::{Bytes, BytesMut};
 
-use crate::{Result, connection::Connection, database::Database, errors::AppError};
+use crate::{
+    Result,
+    buffer::{ArchiveBuf as _, ArchiveBufMut as _},
+    connection::Connection,
+    database::Database,
+};
 
 #[derive(Debug, Clone)]
 pub struct Has {
@@ -10,6 +15,10 @@ pub struct Has {
 }
 
 impl Has {
+    pub fn new(key: String) -> Self {
+        Self { key }
+    }
+
     pub async fn execute(self, db: &Database, connection: &mut Connection) -> Result<()> {
         let value = db.has(&self.key).await;
 
@@ -20,15 +29,18 @@ impl Has {
         Ok(())
     }
 
-    pub fn parse(bytes: &mut Cursor<&[u8]>) -> Result<Self> {
-        let key_length = bytes.try_get_u16()? as usize;
-
-        if bytes.remaining() < key_length {
-            return Err(AppError::IncompleteCommandBuffer);
-        }
-
-        let key = String::from_utf8(bytes.copy_to_bytes(key_length).to_vec())?;
+    pub fn parse(buf: &mut Cursor<&[u8]>) -> Result<Self> {
+        let key = buf.try_get_short_string()?;
 
         Ok(Self { key })
     }
+
+    pub fn put(&self, buf: &mut BytesMut) -> Result<()> {
+        buf.put_short_string("has")?;
+        self.put_without_cmd_name(buf)
+    }
+
+    pub fn put_without_cmd_name(&self, buf: &mut BytesMut) -> Result<()> {
+        buf.put_short_string(&self.key)
+    }
 }

src/commands/m_get.rs

@@ -0,0 +1,60 @@
+use std::io::Cursor;
+
+use crate::{
+    Result,
+    buffer::{ArchiveBuf as _, ArchiveBufMut},
+    connection::Connection,
+    database::Database,
+    errors::AppError,
+};
+use bytes::BytesMut;
+
+use super::get::Get;
+
+#[derive(Debug, Clone)]
+pub struct MGet {
+    gets: Vec<Get>,
+}
+
+impl MGet {
+    pub fn new(gets: Vec<Get>) -> Self {
+        Self { gets }
+    }
+
+    pub async fn execute(self, db: &Database, connection: &mut Connection) -> Result<()> {
+        let mut values = Vec::with_capacity(self.gets.len());
+
+        for get in self.gets {
+            values.push(db.get(&get.key).await);
+        }
+
+        let mut buf = BytesMut::new();
+
+        buf.try_put_vec(values, |data, buf| {
+            buf.put_option(data.as_deref(), ArchiveBufMut::put_bytes_with_length);
+
+            Ok::<(), AppError>(())
+        })?;
+
+        connection.write(buf.into()).await?;
+
+        Ok(())
+    }
+
+    pub fn parse(buf: &mut Cursor<&[u8]>) -> Result<Self> {
+        let gets = buf.try_get_vec(Get::parse)?;
+
+        Ok(Self { gets })
+    }
+
+    pub fn put(&self, buf: &mut BytesMut) -> Result<()> {
+        buf.put_short_string("mget")?;
+        self.put_without_cmd_name(buf)
+    }
+
+    pub fn put_without_cmd_name(&self, buf: &mut BytesMut) -> Result<()> {
+        buf.try_put_vec(&self.gets, Get::put_without_cmd_name)?;
+
+        Ok(())
+    }
+}

src/commands/m_set.rs

@@ -0,0 +1,49 @@
+use std::io::Cursor;
+
+use crate::{
+    Result,
+    buffer::{ArchiveBuf as _, ArchiveBufMut as _},
+    connection::Connection,
+    database::Database,
+};
+use bytes::{Bytes, BytesMut};
+
+use super::set::Set;
+
+#[derive(Debug, Clone)]
+pub struct MSet {
+    sets: Vec<Set>,
+}
+
+impl MSet {
+    pub fn new(sets: Vec<Set>) -> Self {
+        Self { sets }
+    }
+
+    pub async fn execute(self, db: &Database, connection: &mut Connection) -> Result<()> {
+        for set in self.sets {
+            db.set(set.key, set.data, set.expiration).await?;
+        }
+
+        connection.write(Bytes::from_static(&[1])).await?;
+
+        Ok(())
+    }
+
+    pub fn parse(buf: &mut Cursor<&[u8]>) -> Result<Self> {
+        let sets = buf.try_get_vec(Set::parse)?;
+
+        Ok(Self { sets })
+    }
+
+    pub fn put(&self, buf: &mut BytesMut) -> Result<()> {
+        buf.put_short_string("mset")?;
+        self.put_without_cmd_name(buf)
+    }
+
+    pub fn put_without_cmd_name(&self, buf: &mut BytesMut) -> Result<()> {
+        buf.try_put_vec(&self.sets, Set::put_without_cmd_name)?;
+
+        Ok(())
+    }
+}

src/commands/mod.rs

@@ -1,23 +1,29 @@
-mod delete;
-mod expire;
-mod get;
-mod has;
-mod persist;
-mod set;
-mod ttl;
+pub mod delete;
+pub mod expire;
+pub mod get;
+pub mod has;
+pub mod m_get;
+pub mod m_set;
+pub mod persist;
+pub mod set;
+pub mod ttl;
 
 use std::io::Cursor;
 
-use bytes::{Buf, BytesMut};
+use bytes::BytesMut;
 use delete::Delete;
 use expire::Expire;
 use get::Get;
 use has::Has;
+use m_get::MGet;
+use m_set::MSet;
 use persist::Persist;
 use set::Set;
 use ttl::Ttl;
 
-use crate::{Result, connection::Connection, database::Database, errors::AppError};
+use crate::{
+    Result, buffer::ArchiveBuf as _, connection::Connection, database::Database, errors::AppError,
+};
 
 #[derive(Debug)]
 pub enum Command {
@@ -28,6 +34,9 @@ pub enum Command {
     Ttl(Ttl),
     Expire(Expire),
     Persist(Persist),
+
+    MSet(MSet),
+    MGet(MGet),
 }
 
 impl Command {
@@ -40,21 +49,18 @@ impl Command {
             Command::Ttl(ttl) => ttl.execute(db, connection).await,
             Command::Expire(expire) => expire.execute(db, connection).await,
             Command::Persist(persist) => persist.execute(db, connection).await,
+
+            Command::MSet(m_set) => m_set.execute(db, connection).await,
+            Command::MGet(m_get) => m_get.execute(db, connection).await,
         }
     }
 
     pub fn parse(bytes: &BytesMut) -> Result<(Self, u64)> {
-        let mut buffer = Cursor::new(&bytes[..]);
+        let mut buf = Cursor::new(&bytes[..]);
 
-        let name_length = buffer.try_get_u16()? as usize;
+        let name = buf.try_get_short_string()?;
 
-        if buffer.remaining() < name_length {
-            return Err(AppError::IncompleteCommandBuffer);
-        }
-
-        let name = String::from_utf8(buffer.copy_to_bytes(name_length).to_vec())?;
-
-        Self::parse_inner(name, &mut buffer)
+        Self::parse_inner(name, &mut buf)
     }
 
     fn parse_inner(command_name: String, bytes: &mut Cursor<&[u8]>) -> Result<(Self, u64)> {
@@ -66,6 +72,8 @@ impl Command {
             "ttl" => Self::Ttl(Ttl::parse(bytes)?),
             "expire" => Self::Expire(Expire::parse(bytes)?),
             "persist" => Self::Persist(Persist::parse(bytes)?),
+            "mset" => Self::MSet(MSet::parse(bytes)?),
+            "mget" => Self::MGet(MGet::parse(bytes)?),
             _ => return Err(AppError::UnknownCommand(command_name)),
         };
 

src/commands/persist.rs

@@ -1,8 +1,13 @@
 use std::io::Cursor;
 
-use bytes::{Buf as _, Bytes};
+use bytes::{Bytes, BytesMut};
 
-use crate::{Result, connection::Connection, database::Database, errors::AppError};
+use crate::{
+    Result,
+    buffer::{ArchiveBuf as _, ArchiveBufMut as _},
+    connection::Connection,
+    database::Database,
+};
 
 #[derive(Debug, Clone)]
 pub struct Persist {
@@ -10,6 +15,10 @@ pub struct Persist {
 }
 
 impl Persist {
+    pub fn new(key: String) -> Self {
+        Self { key }
+    }
+
     pub async fn execute(self, db: &Database, connection: &mut Connection) -> Result<()> {
         let value = db.persist(&self.key).await?;
 
@@ -20,15 +29,18 @@ impl Persist {
         Ok(())
     }
 
-    pub fn parse(bytes: &mut Cursor<&[u8]>) -> Result<Self> {
-        let key_length = bytes.try_get_u16()? as usize;
-
-        if bytes.remaining() < key_length {
-            return Err(AppError::IncompleteCommandBuffer);
-        }
-
-        let key = String::from_utf8(bytes.copy_to_bytes(key_length).to_vec())?;
+    pub fn parse(buf: &mut Cursor<&[u8]>) -> Result<Self> {
+        let key = buf.try_get_short_string()?;
 
         Ok(Self { key })
     }
+
+    pub fn put(&self, buf: &mut BytesMut) -> Result<()> {
+        buf.put_short_string("persist")?;
+        self.put_without_cmd_name(buf)
+    }
+
+    pub fn put_without_cmd_name(&self, buf: &mut BytesMut) -> Result<()> {
+        buf.put_short_string(&self.key)
+    }
 }

src/commands/set.rs

@@ -1,16 +1,29 @@
 use std::io::Cursor;
 
-use crate::{Result, connection::Connection, database::Database, errors::AppError};
-use bytes::{Buf as _, Bytes};
+use crate::{
+    Result,
+    buffer::{ArchiveBuf as _, ArchiveBufMut as _},
+    connection::Connection,
+    database::Database,
+};
+use bytes::{Buf as _, BufMut as _, Bytes, BytesMut};
 
 #[derive(Debug, Clone)]
 pub struct Set {
-    key: String,
-    data: Box<[u8]>,
-    expiration: Option<u64>,
+    pub(super) key: String,
+    pub(super) data: Box<[u8]>,
+    pub(super) expiration: Option<u64>,
 }
 
 impl Set {
+    pub fn new(key: String, data: Box<[u8]>, expiration: Option<u64>) -> Self {
+        Self {
+            key,
+            data,
+            expiration,
+        }
+    }
+
     pub async fn execute(self, db: &Database, connection: &mut Connection) -> Result<()> {
         db.set(self.key, self.data, self.expiration).await?;
 
@@ -19,28 +32,12 @@ impl Set {
         Ok(())
     }
 
-    pub fn parse(bytes: &mut Cursor<&[u8]>) -> Result<Self> {
-        let key_length = bytes.try_get_u16()? as usize;
+    pub fn parse(buf: &mut Cursor<&[u8]>) -> Result<Self> {
+        let key = buf.try_get_short_string()?;
 
-        if bytes.remaining() < key_length {
-            return Err(AppError::IncompleteCommandBuffer);
-        }
+        let data = buf.try_get_bytes()?;
 
-        let key = String::from_utf8(bytes.copy_to_bytes(key_length).to_vec())?;
-
-        let value_length = bytes.try_get_u32()? as usize;
-
-        if bytes.remaining() < value_length {
-            return Err(AppError::IncompleteCommandBuffer);
-        }
-
-        let data = bytes.copy_to_bytes(value_length);
-
-        let expiration: Option<u64> = match bytes.try_get_u8()? {
-            1 => Some(bytes.try_get_u64()?),
-            0 => None,
-            _ => return Err(AppError::UnexpectedCommandData),
-        };
+        let expiration = buf.try_get_option(Cursor::try_get_u64)?;
 
         Ok(Self {
             key,
@@ -48,4 +45,20 @@ impl Set {
             expiration,
         })
     }
+
+    pub fn put(&self, buf: &mut BytesMut) -> Result<()> {
+        buf.put_short_string("set")?;
+
+        self.put_without_cmd_name(buf)?;
+
+        Ok(())
+    }
+
+    pub fn put_without_cmd_name(&self, buf: &mut BytesMut) -> Result<()> {
+        buf.put_short_string(&self.key)?;
+        buf.put_bytes_with_length(&self.data);
+        buf.put_option(self.expiration, BytesMut::put_u64);
+
+        Ok(())
+    }
 }

src/commands/ttl.rs

@@ -1,8 +1,13 @@
 use std::io::Cursor;
 
-use bytes::{Buf as _, BufMut, Bytes, BytesMut};
+use bytes::{BufMut, BytesMut};
 
-use crate::{Result, connection::Connection, database::Database, errors::AppError};
+use crate::{
+    Result,
+    buffer::{ArchiveBuf as _, ArchiveBufMut as _},
+    connection::Connection,
+    database::Database,
+};
 
 #[derive(Debug, Clone)]
 pub struct Ttl {
@@ -10,33 +15,36 @@ pub struct Ttl {
 }
 
 impl Ttl {
+    pub fn new(key: String) -> Self {
+        Self { key }
+    }
+
     pub async fn execute(self, db: &Database, connection: &mut Connection) -> Result<()> {
         let ttl = db.ttl(&self.key).await;
 
-        let Some(ttl) = ttl else {
-            connection.write(Bytes::from_static(&[0])).await?;
-            return Ok(());
-        };
-
         let mut buf = BytesMut::new();
-
-        buf.put_u8(1);
-        buf.put_u64(ttl);
+        buf.put_option(ttl, BytesMut::put_u64);
 
         connection.write(buf.into()).await?;
 
         Ok(())
     }
 
-    pub fn parse(bytes: &mut Cursor<&[u8]>) -> Result<Self> {
-        let key_length = bytes.try_get_u16()? as usize;
-
-        if bytes.remaining() < key_length {
-            return Err(AppError::IncompleteCommandBuffer);
-        }
-
-        let key = String::from_utf8(bytes.copy_to_bytes(key_length).to_vec())?;
+    pub fn parse(buf: &mut Cursor<&[u8]>) -> Result<Self> {
+        let key = buf.try_get_short_string()?;
 
         Ok(Self { key })
     }
+
+    pub fn put(&self, buf: &mut BytesMut) -> Result<()> {
+        buf.put_short_string("ttl")?;
+
+        self.put_without_cmd_name(buf)?;
+
+        Ok(())
+    }
+
+    pub fn put_without_cmd_name(&self, buf: &mut BytesMut) -> Result<()> {
+        buf.put_short_string(&self.key)
+    }
 }

src/errors.rs

@@ -6,8 +6,8 @@ pub enum AppError {
     Io(#[from] std::io::Error),
     #[error("A TryGetError occurred")]
     TryGet(#[from] bytes::TryGetError),
-    #[error("The buffer is missing data for a complete command")]
-    IncompleteCommandBuffer,
+    #[error("The buffer is missing data")]
+    IncompleteBuffer,
     #[error("A Utf8Error occurred")]
     FromUtf8(#[from] std::string::FromUtf8Error),
     #[error("The command {0} was not recognized")]
@@ -18,6 +18,8 @@ pub enum AppError {
     NoResponse,
     #[error("Expected a different response for the executed command")]
     InvalidCommandResponse,
-    #[error("The binary command data is not structured correctly")]
-    UnexpectedCommandData,
+    #[error("The binary data is not structured correctly")]
+    UnexpectedData,
+    #[error("Failed to convert integer")]
+    TryFromInt(#[from] std::num::TryFromIntError),
 }

src/lib.rs

@@ -3,6 +3,7 @@ use errors::AppError;
 #[cfg(test)]
 pub mod tests;
 
+pub mod buffer;
 pub mod client;
 pub mod commands;
 pub mod config;

src/tests.rs

@@ -50,6 +50,54 @@ async fn expiration() -> Result<(), Box<dyn std::error::Error>> {
     Ok(())
 }
 
+#[tokio::test]
+async fn m_set_m_get() -> Result<(), Box<dyn std::error::Error>> {
+    let config = ServerConfig::builder()
+        .host("127.0.0.1".into())
+        .port(6172)
+        .build();
+    let mut server = Server::new(&config).await?;
+
+    let (shutdown_tx, shutdown_rx) = oneshot::channel();
+    let server_handle = tokio::spawn(async move { server.run(shutdown_rx).await });
+
+    let mut client = client("127.0.0.1:6172").await?;
+
+    client
+        .m_set(
+            vec!["key-0", "key-1", "key-2"],
+            vec![b"value-0", b"value-1", b"value-2"],
+            vec![None, Some(2), None],
+        )
+        .await?;
+
+    assert_eq!(
+        client
+            .m_get(vec!["key-0".into(), "key-1".into(), "key-2".into()])
+            .await?,
+        vec![
+            Some("value-0".into()),
+            Some("value-1".into()),
+            Some("value-2".into())
+        ]
+    );
+
+    tokio::time::sleep(Duration::from_secs(2)).await;
+
+    assert_eq!(
+        client
+            .m_get(vec!["key-0".into(), "key-1".into(), "key-2".into()])
+            .await?,
+        vec![Some("value-0".into()), None, Some("value-2".into())]
+    );
+
+    shutdown_tx.send(()).unwrap();
+
+    server_handle.await??;
+
+    Ok(())
+}
+
 async fn client<A: tokio::net::ToSocketAddrs>(
     addr: A,
 ) -> Result<Client, Box<dyn std::error::Error>> {