From a22bf37788ed578722e4cfa95e9996433a81caa2 Mon Sep 17 00:00:00 2001
From: Martin Boehm <martin.boehm@1mbsoftware.net>
Date: Sat, 21 May 2022 13:09:31 +0200
Subject: [PATCH] Litecoin: Adapt to MWEB related changes in backend 0.21.2,
 #770

---
 bchain/coins/litecoin/litecoinrpc.go | 54 ++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/bchain/coins/litecoin/litecoinrpc.go b/bchain/coins/litecoin/litecoinrpc.go
index ad0ec462..ca62445b 100644
--- a/bchain/coins/litecoin/litecoinrpc.go
+++ b/bchain/coins/litecoin/litecoinrpc.go
@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 
 	"github.com/golang/glog"
+	"github.com/juju/errors"
 	"github.com/trezor/blockbook/bchain"
 	"github.com/trezor/blockbook/bchain/coins/btc"
 )
@@ -56,3 +57,56 @@ func (b *LitecoinRPC) Initialize() error {
 
 	return nil
 }
+
+// GetBlock returns block with given hash.
+// Litecoin cannot use optimized BitcoinRPC.GetBlock since v 0.21.2,
+// which introduced MWEB fields to the transaction data and made the serialized block incompatible with Bitcoin wire protocol
+func (b *LitecoinRPC) GetBlock(hash string, height uint32) (*bchain.Block, error) {
+	var err error
+	if hash == "" && height > 0 {
+		hash, err = b.GetBlockHash(height)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	glog.V(1).Info("rpc: getblock (verbosity=1) ", hash)
+
+	res := btc.ResGetBlockThin{}
+	req := btc.CmdGetBlock{Method: "getblock"}
+	req.Params.BlockHash = hash
+	req.Params.Verbosity = 1
+	err = b.Call(&req, &res)
+
+	if err != nil {
+		return nil, errors.Annotatef(err, "hash %v", hash)
+	}
+	if res.Error != nil {
+		return nil, errors.Annotatef(res.Error, "hash %v", hash)
+	}
+
+	txs := make([]bchain.Tx, 0, len(res.Result.Txids))
+	for _, txid := range res.Result.Txids {
+		tx, err := b.GetTransaction(txid)
+		if err != nil {
+			if err == bchain.ErrTxNotFound {
+				glog.Errorf("rpc: getblock: skipping transaction in block %s due error: %s", hash, err)
+				continue
+			}
+			return nil, err
+		}
+		txs = append(txs, *tx)
+	}
+	block := &bchain.Block{
+		BlockHeader: res.Result.BlockHeader,
+		Txs:         txs,
+	}
+	return block, nil
+}
+
+// GetTransactionForMempool returns a transaction by the transaction ID
+// Litecoin cannot use optimized BitcoinRPC.GetTransactionForMempool since v 0.21.2,
+// which introduced MWEB fields to the transaction data and made the serialized transaction incompatible with Bitcoin wire protocol
+func (b *LitecoinRPC) GetTransactionForMempool(txid string) (*bchain.Tx, error) {
+	return b.GetTransaction(txid)
+}