From 6ec934a8d78d7d92904774f28aa392a104824604 Mon Sep 17 00:00:00 2001
From: Henry de Valence <hdevalence@hdevalence.ca>
Date: Wed, 18 Mar 2020 17:00:12 -0700
Subject: [PATCH] impl FromStr for BlockHeaderHash

This is very convenient for putting block hashes in the source code.
---
 zebra-chain/src/block.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/zebra-chain/src/block.rs b/zebra-chain/src/block.rs
index 2ffed136..86ce1dac 100644
--- a/zebra-chain/src/block.rs
+++ b/zebra-chain/src/block.rs
@@ -67,6 +67,18 @@ impl ZcashDeserialize for BlockHeaderHash {
     }
 }
 
+impl std::str::FromStr for BlockHeaderHash {
+    type Err = SerializationError;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let mut bytes = [0; 32];
+        if hex::decode_to_slice(s, &mut bytes[..]).is_err() {
+            Err(SerializationError::Parse("hex decoding error"))
+        } else {
+            Ok(BlockHeaderHash(bytes))
+        }
+    }
+}
+
 /// Block header.
 ///
 /// How are blocks chained together? They are chained together via the