Add chainname and activation height to getinfo

common/common.go

@@ -0,0 +1,42 @@
+package common
+
+import (
+	"encoding/json"
+	"strconv"
+	"strings"
+
+	"github.com/adityapk00/btcd/rpcclient"
+	"github.com/pkg/errors"
+)
+
+func GetSaplingInfo(rpcClient *rpcclient.Client) (int, string, error) {
+	result, rpcErr := rpcClient.RawRequest("getblockchaininfo", make([]json.RawMessage, 0))
+
+	var err error
+	var errCode int64
+
+	// For some reason, the error responses are not JSON
+	if rpcErr != nil {
+		errParts := strings.SplitN(rpcErr.Error(), ":", 2)
+		errCode, err = strconv.ParseInt(errParts[0], 10, 32)
+		//Check to see if we are requesting a height the zcashd doesn't have yet
+		if err == nil && errCode == -8 {
+			return -1, "", nil
+		}
+		return -1, "", errors.Wrap(rpcErr, "error requesting block")
+	}
+
+	var f interface{}
+	err = json.Unmarshal(result, &f)
+	if err != nil {
+		return -1, "", errors.Wrap(err, "error reading JSON response")
+	}
+
+	chainName := f.(map[string]interface{})["chain"].(string)
+
+	upgradeJSON := f.(map[string]interface{})["upgrades"]
+	saplingJSON := upgradeJSON.(map[string]interface{})["76b809bb"] // Sapling ID
+	saplingHeight := saplingJSON.(map[string]interface{})["activationheight"].(float64)
+
+	return int(saplingHeight), chainName, nil
+}