util: add env var util functions

pkg/util/envvars.go

@@ -0,0 +1,38 @@
+package util
+
+import (
+	"os"
+	"strconv"
+
+	"github.com/sirupsen/logrus"
+)
+
+func GetEnvVarInt(n string) (int, bool) {
+	str, ok := os.LookupEnv(n)
+	if !ok {
+		return 0, false
+	}
+
+	num, err := strconv.Atoi(str)
+	if err != nil {
+		logrus.WithError(err).Errorf("can not parse env var %q as int, incorrect format", str)
+		return 0, false
+	}
+
+	return num, true
+}
+
+func GetEnvVarBool(n string) (bool, bool) {
+	str, ok := os.LookupEnv(n)
+	if !ok {
+		return false, false
+	}
+
+	num, err := strconv.ParseBool(str)
+	if err != nil {
+		logrus.WithError(err).Errorf("can not parse env var %q as bool, incorrect format", str)
+		return false, false
+	}
+
+	return num, true
+}