feat: add batch_transaction_get_merkle

- adds the new batch method for `blockchain.transaction.get_merkle`.

Author: oleonardolima

src/api.rs

@@ -145,6 +145,17 @@ where
         (**self).transaction_get_merkle(txid, height)
     }
 
+    fn batch_transaction_get_merkle<'s, I>(
+        &self,
+        txids_and_heights: I,
+    ) -> Result<Vec<GetMerkleRes>, Error>
+    where
+        I: IntoIterator + Clone,
+        I::Item: Borrow<&'s (Txid, usize)>,
+    {
+        (**self).batch_transaction_get_merkle(txids_and_heights)
+    }
+
     fn txid_from_pos(&self, height: usize, tx_pos: usize) -> Result<Txid, Error> {
         (**self).txid_from_pos(height, tx_pos)
     }
@@ -362,6 +373,17 @@ pub trait ElectrumApi {
     /// Returns the merkle path for the transaction `txid` confirmed in the block at `height`.
     fn transaction_get_merkle(&self, txid: &Txid, height: usize) -> Result<GetMerkleRes, Error>;
 
+    /// Batch version of [`transaction_get_merkle`](#method.transaction_get_merkle).
+    ///
+    /// Take a list of `(txid, height)`, for transactions with `txid` confirmed in the block at `height`.
+    fn batch_transaction_get_merkle<'s, I>(
+        &self,
+        txids_and_heights: I,
+    ) -> Result<Vec<GetMerkleRes>, Error>
+    where
+        I: IntoIterator + Clone,
+        I::Item: Borrow<&'s (Txid, usize)>;
+
     /// Returns a transaction hash, given a block `height` and a `tx_pos` in the block.
     fn txid_from_pos(&self, height: usize, tx_pos: usize) -> Result<Txid, Error>;
 
@@ -558,6 +580,17 @@ mod test {
             unreachable!()
         }
 
+        fn batch_transaction_get_merkle<'s, I>(
+            &self,
+            _: I,
+        ) -> Result<Vec<crate::GetMerkleRes>, crate::Error>
+        where
+            I: IntoIterator + Clone,
+            I::Item: std::borrow::Borrow<&'s (bitcoin::Txid, usize)>,
+        {
+            unreachable!()
+        }
+
         fn txid_from_pos(&self, _: usize, _: usize) -> Result<bitcoin::Txid, super::Error> {
             unreachable!()
         }

src/batch.rs

@@ -62,6 +62,17 @@ impl Batch {
             .push((String::from("blockchain.transaction.get"), params));
     }
 
+    /// Add one `blockchain.transaction.get_merkle` request to the batch queue
+    pub fn transaction_get_merkle(&mut self, tx_hash_and_height: &(Txid, usize)) {
+        let (tx_hash, height) = tx_hash_and_height;
+        let params = vec![
+            Param::String(format!("{:x}", tx_hash)),
+            Param::Usize(*height),
+        ];
+        self.calls
+            .push((String::from("blockchain.transaction.get_merkle"), params));
+    }
+
     /// Add one `blockchain.estimatefee` request to the batch queue
     pub fn estimate_fee(&mut self, number: usize) {
         let params = vec![Param::Usize(number)];

src/client.rs

@@ -327,6 +327,22 @@ impl ElectrumApi for Client {
         impl_inner_call!(self, transaction_get_merkle, txid, height)
     }
 
+    #[inline]
+    fn batch_transaction_get_merkle<'s, I>(
+        &self,
+        txids_and_heights: I,
+    ) -> Result<Vec<GetMerkleRes>, Error>
+    where
+        I: IntoIterator + Clone,
+        I::Item: Borrow<&'s (Txid, usize)>,
+    {
+        impl_inner_call!(
+            self,
+            batch_transaction_get_merkle,
+            txids_and_heights.clone()
+        )
+    }
+
     #[inline]
     fn txid_from_pos(&self, height: usize, tx_pos: usize) -> Result<Txid, Error> {
         impl_inner_call!(self, txid_from_pos, height, tx_pos)

src/raw_client.rs

@@ -1102,6 +1102,17 @@ impl<T: Read + Write> ElectrumApi for RawClient<T> {
         Ok(serde_json::from_value(result)?)
     }
 
+    fn batch_transaction_get_merkle<'s, I>(
+        &self,
+        txids_and_hashes: I,
+    ) -> Result<Vec<GetMerkleRes>, Error>
+    where
+        I: IntoIterator + Clone,
+        I::Item: Borrow<&'s (Txid, usize)>,
+    {
+        impl_batch_call!(self, txids_and_hashes, transaction_get_merkle)
+    }
+
     fn txid_from_pos(&self, height: usize, tx_pos: usize) -> Result<Txid, Error> {
         let params = vec![Param::Usize(height), Param::Usize(tx_pos)];
         let req = Request::new_id(