expire command

src/commands/expire.rs

@@ -0,0 +1,37 @@
+use std::io::Cursor;
+
+use bytes::{Buf as _, Bytes};
+
+use crate::{Result, connection::Connection, database::Database, errors::AppError};
+
+#[derive(Debug, Clone)]
+pub struct Expire {
+    key: String,
+    seconds: u64,
+}
+
+impl Expire {
+    pub async fn execute(self, db: &Database, connection: &mut Connection) -> Result<()> {
+        let value = db.expire(&self.key, self.seconds).await?;
+
+        connection
+            .write(Bytes::from_static(if value { &[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()?;
+
+        Ok(Self { key, seconds })
+    }
+}