com.vlkan.log4j2.logstash.layout.resolver.SourceHostResolver Maven / Gradle / Ivy

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package com.vlkan.log4j2.logstash.layout.resolver;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.TextNode;
import org.apache.logging.log4j.core.LogEvent;

import java.net.InetAddress;
import java.net.UnknownHostException;

public class SourceHostResolver implements TemplateResolver {

    private static final SourceHostResolver INSTANCE = new SourceHostResolver();

    private static final String SOURCE_HOST = getLocalHost();

    private static final TextNode SOURCE_HOST_NODE = new TextNode(SOURCE_HOST);

    private static String getLocalHost() {
        try {
            return InetAddress.getLocalHost().getHostName();
        } catch (UnknownHostException error) {
            return "localhost";
        }
    }

    private SourceHostResolver() {
        // Do nothing.
    }

    public static SourceHostResolver getInstance() {
        return INSTANCE;
    }

    @Override
    public String getName() {
        return "sourceHost";
    }

    @Override
    public JsonNode resolve(TemplateResolverContext context, LogEvent logEvent) {
        return SOURCE_HOST_NODE;
    }

}