HostInfoEnvironmentPostProcessor.java

package org.springframework.cloud.client;

import java.util.LinkedHashMap;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.bind.PropertySourcesPropertyValues;
import org.springframework.boot.bind.RelaxedDataBinder;
import org.springframework.boot.context.config.ConfigFileApplicationListener;
import org.springframework.boot.env.EnvironmentPostProcessor;
import org.springframework.cloud.commons.util.InetUtils;
import org.springframework.cloud.commons.util.InetUtils.HostInfo;
import org.springframework.cloud.commons.util.InetUtilsProperties;
import org.springframework.core.Ordered;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.MapPropertySource;

/**
 * @author Spencer Gibb
 */
public class HostInfoEnvironmentPostProcessor
		implements EnvironmentPostProcessor, Ordered {

	// Before ConfigFileApplicationListener
	private int order = ConfigFileApplicationListener.DEFAULT_ORDER - 1;

	@Override
	public int getOrder() {
		return this.order;
	}

	@Override
	public void postProcessEnvironment(ConfigurableEnvironment environment,
			SpringApplication application) {
		InetUtils.HostInfo hostInfo = getFirstNonLoopbackHostInfo(environment);
		LinkedHashMap<String, Object> map = new LinkedHashMap<>();
		map.put("spring.cloud.client.hostname", hostInfo.getHostname());
		map.put("spring.cloud.client.ipAddress", hostInfo.getIpAddress());
		MapPropertySource propertySource = new MapPropertySource(
				"springCloudClientHostInfo", map);
		environment.getPropertySources().addLast(propertySource);
	}

	private HostInfo getFirstNonLoopbackHostInfo(ConfigurableEnvironment environment) {
		InetUtilsProperties target = new InetUtilsProperties();
		RelaxedDataBinder binder = new RelaxedDataBinder(target,
				InetUtilsProperties.PREFIX);
		binder.bind(new PropertySourcesPropertyValues(environment.getPropertySources()));
		try (InetUtils utils = new InetUtils(target)) {
			return utils.findFirstNonLoopbackHostInfo();
		}
	}
}