ja-netfilter/src/main/java/io/zhile/research/ja/netfilter/commons/DebugInfo.java

package io.zhile.research.ja.netfilter.commons;

import io.zhile.research.ja.netfilter.utils.DateUtils;

public class DebugInfo {
    private static final boolean DEBUG = "1".equals(System.getenv("JANF_DEBUG"));

    public static void output(String content) { // No logger lib required
        if (!DEBUG) {
            return;
        }

        String template = "[%s] %s DEBUG : %s%n";

        StackTraceElement[] traces = new Throwable().getStackTrace();
        String caller = traces.length < 2 ? "UNKNOWN" : traces[1].toString();

        System.out.printf(template, DateUtils.formatNow(), caller, content);
    }
}