privval: add grpc (#5725)

Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>

node/utils.go

@@ -0,0 +1,26 @@
+package node
+
+import (
+	"strings"
+)
+
+// splitAndTrimEmpty slices s into all subslices separated by sep and returns a
+// slice of the string s with all leading and trailing Unicode code points
+// contained in cutset removed. If sep is empty, SplitAndTrim splits after each
+// UTF-8 sequence. First part is equivalent to strings.SplitN with a count of
+// -1.  also filter out empty strings, only return non-empty strings.
+func splitAndTrimEmpty(s, sep, cutset string) []string {
+	if s == "" {
+		return []string{}
+	}
+
+	spl := strings.Split(s, sep)
+	nonEmptyStrings := make([]string, 0, len(spl))
+	for i := 0; i < len(spl); i++ {
+		element := strings.Trim(spl[i], cutset)
+		if element != "" {
+			nonEmptyStrings = append(nonEmptyStrings, element)
+		}
+	}
+	return nonEmptyStrings
+}