From cf462a82740086f85a074bed85918eaa5eaa7a68 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Tue, 4 Dec 2018 10:48:44 +0100
Subject: [PATCH] Add block_exists utility function

---
 storage/src/lib.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/storage/src/lib.rs b/storage/src/lib.rs
index 8b59f506a..456dde020 100644
--- a/storage/src/lib.rs
+++ b/storage/src/lib.rs
@@ -261,6 +261,14 @@ pub fn block_read(storage: &Storage, hash: &HeaderHash) -> Result<RawBlock> {
     block_read_location(storage, &block_location(storage, hash)?, hash)
 }
 
+pub fn block_exists(storage: &Storage, hash: &HeaderHash) -> Result<bool> {
+    match block_location(storage, hash) {
+        Ok(_) => Ok(true),
+        Err(Error::HashNotFound(_)) => Ok(false),
+        Err(err) => Err(err),
+    }
+}
+
 enum ReverseSearch {
     Continue,
     Found,