Add server client

crates/pile-value/src/source/mod.rs

@@ -17,9 +17,18 @@ pub trait DataSource {
 		key: &str,
 	) -> impl Future<Output = Result<Option<crate::value::Item>, std::io::Error>> + Send;
 
-	/// Iterate over all items in this source in an arbitrary order
+	/// Iterate over all items in this source in sorted key order
 	fn iter(&self) -> impl Iterator<Item = &crate::value::Item>;
 
+	/// Iterate over a page of items, sorted by key
+	fn iter_page(
+		&self,
+		offset: usize,
+		limit: usize,
+	) -> impl Iterator<Item = &crate::value::Item> {
+		self.iter().skip(offset).take(limit)
+	}
+
 	/// Return the time of the latest change to the data in this source
 	fn latest_change(
 		&self,