anchor provider trait

storage/src/anchors.rs

@@ -0,0 +1,17 @@
+use hash::H256;
+use bytes::Bytes;
+use {EpochTag, RegularTreeState};
+
+pub trait AnchorProvider {
+	fn tree_bytes_at(&self, root: &H256) -> Option<Bytes>;
+
+	fn tree_at(&self, root: &H256) -> Option<RegularTreeState> {
+		self.tree_bytes_at(root)
+			.map(
+				|bytes| serialization::Reader::new(&bytes[..])
+					.read::<RegularTreeState>()
+					.expect("Corrupted database: wrong tree state format!")
+			)
+	}
+}
+

storage/src/lib.rs

@@ -25,6 +25,7 @@ mod transaction_meta;
 mod transaction_provider;
 mod nullifier;
 mod tree_state;
+mod anchors;
 
 pub use primitives::{hash, bytes};
 
@@ -41,6 +42,7 @@ pub use transaction_meta::TransactionMeta;
 pub use transaction_provider::{TransactionProvider, TransactionOutputProvider, TransactionMetaProvider};
 pub use nullifier::{Nullifier, NullifierTracker};
 pub use tree_state::{TreeState, H32 as H32TreeDim, Dim as TreeDim, RegularTreeState};
+pub use anchors::AnchorProvider;
 
 /// Epoch tag.
 ///