plugin/timeouts - Allow ability to configure listening server timeouts (#5784)

plugin/pkg/durations/durations.go

@@ -0,0 +1,26 @@
+package durations
+
+import (
+	"fmt"
+	"strconv"
+	"time"
+)
+
+// NewDurationFromArg returns a time.Duration from a configuration argument
+// (string) which has come from the Corefile. The argument has some basic
+// validation applied before returning a time.Duration. If the argument has no
+// time unit specified and is numeric the argument will be treated as seconds
+// rather than GO's default of nanoseconds.
+func NewDurationFromArg(arg string) (time.Duration, error) {
+	_, err := strconv.Atoi(arg)
+	if err == nil {
+		arg = arg + "s"
+	}
+
+	d, err := time.ParseDuration(arg)
+	if err != nil {
+		return 0, fmt.Errorf("failed to parse duration '%s'", arg)
+	}
+
+	return d, nil
+}