add bucket sys marshal func

ecstore/src/bucket/lifecycle/lifecycle.rs

@@ -1,9 +1,26 @@
 use super::rule::Rule;
+use crate::error::Result;
+use rmp_serde::Serializer as rmpSerializer;
 use serde::{Deserialize, Serialize};
 use time::OffsetDateTime;
 
-#[derive(Debug, Deserialize, Serialize, Default,Clone)]
+#[derive(Debug, Deserialize, Serialize, Default, Clone)]
 pub struct Lifecycle {
     pub rules: Vec<Rule>,
     pub expiry_updated_at: Option<OffsetDateTime>,
 }
+
+impl Lifecycle {
+    pub fn marshal_msg(&self) -> Result<Vec<u8>> {
+        let mut buf = Vec::new();
+
+        self.serialize(&mut rmpSerializer::new(&mut buf).with_struct_map())?;
+
+        Ok(buf)
+    }
+
+    pub fn unmarshal(buf: &[u8]) -> Result<Self> {
+        let t: Lifecycle = rmp_serde::from_slice(buf)?;
+        Ok(t)
+    }
+}