added get_block json rpc method (#123)

* added get_block json rpc method

* fix fmt check errors

* fix clippy warnings

* fix fmt warnings 2

---------

Co-authored-by: essecara <no@example.com>
Co-authored-by: h4sh3d <h4sh3d@protonmail.com>

src/lib.rs

@@ -63,6 +63,8 @@ pub use self::{models::*, util::*};
 
 use jsonrpc_core::types::{Id, *};
 use monero::{
+    blockdata::block::Block,
+    consensus::deserialize,
     cryptonote::{hash::Hash as CryptoNoteHash, subaddress},
     util::{address::PaymentId, amount},
     Address, Amount,
@@ -409,6 +411,32 @@ impl DaemonJsonRpcClient {
             .count)
     }
 
+    pub async fn get_block(&self, selector: GetBlockHeaderSelector) -> anyhow::Result<Block> {
+        let (request, params) = match selector {
+            GetBlockHeaderSelector::Hash(hash) => (
+                "get_block",
+                RpcParams::map(
+                    Some(("hash", serde_json::to_value(HashString(hash)).unwrap())).into_iter(),
+                ),
+            ),
+            GetBlockHeaderSelector::Height(height) => (
+                "get_block",
+                RpcParams::map(Some(("height", height.into())).into_iter()),
+            ),
+            GetBlockHeaderSelector::Last => ("get_block", RpcParams::None),
+        };
+
+        match self.inner.request::<Value>(request, params).await {
+            Ok(res) => {
+                let block_str = res["blob"].as_str().unwrap();
+                let block_hex = hex::decode(block_str).unwrap();
+                let block: Block = deserialize(&block_hex).unwrap();
+                Ok(block)
+            }
+            Err(e) => Err(anyhow::Error::msg(format!("Can not fetch block: {}", e))),
+        }
+    }
+
     /// Look up a block's hash by its height.
     pub async fn on_get_block_hash(&self, height: u64) -> anyhow::Result<BlockHash> {
         let res = self