Fix bcash EstimateFee after interface change in backend v0.19.1

bchain/coins/bch/bcashrpc.go

@@ -5,6 +5,7 @@ import (
 	"blockbook/bchain/coins/btc"
 	"encoding/hex"
 	"encoding/json"
+	"math/big"
 
 	"github.com/golang/glog"
 	"github.com/juju/errors"
@@ -161,3 +162,35 @@ func isErrBlockNotFound(err *bchain.RPCError) bool {
 	return err.Message == "Block not found" ||
 		err.Message == "Block height out of range"
 }
+
+// EstimateFee returns fee estimation
+func (b *BCashRPC) EstimateFee(blocks int) (big.Int, error) {
+	//  from version BitcoinABC version 0.19.1 EstimateFee does not support parameter Blocks
+	if b.ChainConfig.CoinShortcut == "BCHSV" {
+		return b.BitcoinRPC.EstimateFee(blocks)
+	}
+
+	glog.V(1).Info("rpc: estimatefee ", blocks)
+
+	res := btc.ResEstimateFee{}
+	req := struct {
+		Method string `json:"method"`
+	}{
+		Method: "estimatefee",
+	}
+
+	err := b.Call(&req, &res)
+
+	var r big.Int
+	if err != nil {
+		return r, err
+	}
+	if res.Error != nil {
+		return r, res.Error
+	}
+	r, err = b.Parser.AmountToBigInt(res.Result)
+	if err != nil {
+		return r, err
+	}
+	return r, nil
+}

configs/coins/bcash.json

@@ -49,7 +49,7 @@
     "additional_params": "",
     "block_chain": {
       "parse": true,
-      "subversion": "/Bitcoin ABC:0.17.1/",
+      "subversion": "/Bitcoin ABC:0.19.1/",
       "address_format": "cashaddr",
       "mempool_workers": 8,
       "mempool_sub_workers": 2,