From 758dba18fd4c5f6d8db8ba51e34646fbb2302042 Mon Sep 17 00:00:00 2001
From: Vladimir Fomene <vladimirfomene@gmail.com>
Date: Thu, 16 Jun 2022 20:42:02 +0100
Subject: [PATCH] Get block hash by its height

Create blockchain::GetBlockHash trait
with a method to get block hash given
a block height. Then, implement this
trait for all backends (Electrum, RPC
, Esplora, CBF). Referenced in issue 603.
---
 src/blockchain/esplora/reqwest.rs | 8 ++++++++
 src/blockchain/esplora/ureq.rs    | 7 +++++++
 2 files changed, 15 insertions(+)

diff --git a/src/blockchain/esplora/reqwest.rs b/src/blockchain/esplora/reqwest.rs
index f68bdd8..0d40506 100644
--- a/src/blockchain/esplora/reqwest.rs
+++ b/src/blockchain/esplora/reqwest.rs
@@ -117,6 +117,14 @@ impl GetTx for EsploraBlockchain {
     }
 }
 
+#[maybe_async]
+impl GetBlockHash for EsploraBlockchain {
+    fn get_block_hash(&self, height: u64) -> Result<BlockHash, Error> {
+        let block_header = await_or_block!(self.url_client._get_header(height as u32))?;
+        Ok(block_header.block_hash())
+    }
+}
+
 #[maybe_async]
 impl WalletSync for EsploraBlockchain {
     fn wallet_setup<D: BatchDatabase>(
diff --git a/src/blockchain/esplora/ureq.rs b/src/blockchain/esplora/ureq.rs
index 7ce57a1..9899b90 100644
--- a/src/blockchain/esplora/ureq.rs
+++ b/src/blockchain/esplora/ureq.rs
@@ -112,6 +112,13 @@ impl GetTx for EsploraBlockchain {
     }
 }
 
+impl GetBlockHash for EsploraBlockchain {
+    fn get_block_hash(&self, height: u64) -> Result<BlockHash, Error> {
+        let block_header = self.url_client._get_header(height as u32)?;
+        Ok(block_header.block_hash())
+    }
+}
+
 impl WalletSync for EsploraBlockchain {
     fn wallet_setup<D: BatchDatabase>(
         &self,