Add support for *suffix in filterhelpers.go

utils/coreutils.go

@@ -313,6 +313,16 @@ func SplitPrefix(prefix string, minLength int) []string {
 	return subs
 }
 
+func SplitSuffix(suffix string) []string {
+	length := len(suffix)
+	subs := make([]string, length)
+	max := len(suffix) - 1
+	for i := 0; i < length; i++ {
+		subs[i] = suffix[max-i:]
+	}
+	return subs
+}
+
 func CopyHour(src, dest time.Time) time.Time {
 	if src.Hour() == 0 && src.Minute() == 0 && src.Second() == 0 {
 		return src

utils/coreutils_test.go

@@ -522,14 +522,35 @@ func TestRoundDuration(t *testing.T) {
 }
 
 func TestSplitPrefix(t *testing.T) {
+	exp := []string{"0123456789", "012345678", "01234567", "0123456", "012345", "01234", "0123", "012", "01", "0"}
 	if a := SplitPrefix("0123456789", 1); len(a) != 10 {
 		t.Error("Error splitting prefix: ", a)
+	} else if !reflect.DeepEqual(a, exp) {
+		t.Errorf("Expecting: %v, received: %v", exp, a)
 	}
+	exp = []string{"0123456789", "012345678", "01234567", "0123456", "012345", "01234"}
 	if a := SplitPrefix("0123456789", 5); len(a) != 6 {
 		t.Error("Error splitting prefix: ", a)
+	} else if !reflect.DeepEqual(a, exp) {
+		t.Errorf("Expecting: %v, received: %v", exp, a)
 	}
+	exp = []string{}
 	if a := SplitPrefix("", 1); len(a) != 0 {
 		t.Error("Error splitting prefix: ", a)
+	} else if !reflect.DeepEqual(a, exp) {
+		t.Errorf("Expecting: %v, received: %v", exp, a)
+	}
+}
+
+func TestSplitSuffix(t *testing.T) {
+	exp := []string{"9", "89", "789", "6789", "56789", "456789", "3456789", "23456789", "123456789", "0123456789"}
+	if a := SplitSuffix("0123456789"); len(a) != 10 {
+		t.Error("Error splitting prefix: ", ToJSON(a))
+	} else if !reflect.DeepEqual(a, exp) {
+		t.Errorf("Expecting: %v, received: %v", exp, a)
+	}
+	if a := SplitSuffix(""); len(a) != 0 {
+		t.Error("Error splitting prefix: ", a)
 	}
 }