Add block ref table

src/block_ref_table.rs

@@ -0,0 +1,51 @@
+use async_trait::async_trait;
+use serde::{Deserialize, Serialize};
+use std::sync::Arc;
+use tokio::sync::RwLock;
+
+use crate::data::*;
+use crate::server::Garage;
+use crate::table::*;
+
+#[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
+pub struct BlockRef {
+	// Primary key
+	pub block: Hash,
+
+	// Sort key
+	pub version: UUID,
+
+	// Keep track of deleted status
+	pub deleted: bool,
+}
+
+impl Entry<Hash, UUID> for BlockRef {
+	fn partition_key(&self) -> &Hash {
+		&self.block
+	}
+	fn sort_key(&self) -> &UUID {
+		&self.version
+	}
+
+	fn merge(&mut self, other: &Self) {
+		if other.deleted {
+			self.deleted = true;
+		}
+	}
+}
+
+pub struct BlockRefTable {
+	pub garage: RwLock<Option<Arc<Garage>>>,
+}
+
+#[async_trait]
+impl TableFormat for BlockRefTable {
+	type P = Hash;
+	type S = UUID;
+	type E = BlockRef;
+
+	async fn updated(&self, old: Option<&Self::E>, new: &Self::E) {
+		//unimplemented!()
+		// TODO
+	}
+}