refactor string / byte reads from buffer

src/commands/delete.rs

@@ -1,8 +1,8 @@
 use std::io::Cursor;
 
-use bytes::{Buf as _, BufMut as _, BytesMut};
+use bytes::{BufMut as _, BytesMut};
 
-use crate::{Result, connection::Connection, database::Database, errors::AppError};
+use crate::{Result, buffer::try_get_string, connection::Connection, database::Database};
 
 #[derive(Debug, Clone)]
 pub struct Delete {
@@ -29,13 +29,7 @@ impl Delete {
     }
 
     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 key = try_get_string(bytes)?;
 
         Ok(Self { key })
     }