/**
 * Copyright 2016 Netflix, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.netflix.dynomitemanager.sidecore.config;

import com.netflix.dynomitemanager.sidecore.utils.SystemUtils;
import com.netflix.dynomitemanager.sidecore.config.InstanceDataRetriever;
import com.netflix.dynomitemanager.sidecore.config.VpcInstanceDataRetriever;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Calls AWS ec2 metadata to get info on the location of the running instance in VPC.
 * Public Hostname will return local-hostname
 * Public IP will return local-ipv4
 */
public class VpcInstanceDataRetriever implements InstanceDataRetriever
{
	private static final Logger logger = LoggerFactory.getLogger(VpcInstanceDataRetriever.class);

	
    public String getRac()
    {
        return SystemUtils.getDataFromUrl("http://169.254.169.254/latest/meta-data/placement/availability-zone");
    }

    public String getPublicHostname()
    {
        return SystemUtils.getDataFromUrl("http://169.254.169.254/latest/meta-data/local-hostname");
    }

    public String getPublicIP()
    {
        return SystemUtils.getDataFromUrl("http://169.254.169.254/latest/meta-data/local-ipv4");
    }

    public String getInstanceId()
    {
        return SystemUtils.getDataFromUrl("http://169.254.169.254/latest/meta-data/instance-id");
    }

    public String getInstanceType()
    {
        return SystemUtils.getDataFromUrl("http://169.254.169.254/latest/meta-data/instance-type");
    }
    
	@Override
	/*
	 * @return id of the network interface for running instance
	 */
	public String getMac() {
		return SystemUtils.getDataFromUrl("http://169.254.169.254/latest/meta-data/network/interfaces/macs/").trim();
	}

	@Override
	/*
	 * @return the id of the vpc account for running instance, null if does not exist.
	 */
	public String getVpcId() {
		String nacId = getMac();
		if (nacId == null || nacId.isEmpty()) 
			return null;
		
		String vpcId = null;
		try {
			vpcId = SystemUtils.getDataFromUrl("http://169.254.169.254/latest/meta-data/network/interfaces/macs/" + nacId + "vpc-id").trim();			
		} catch (Exception e) {
			logger.info("Vpc id does not exist for running instance, not fatal as running instance maybe not be in vpc.  Msg: " + e.getLocalizedMessage());
		}

		return  vpcId;
	}
}

@@ -1545,21 +1545,22 @@
 ta-data/
-local
+public
 -hostnam
@@ -1692,21 +1692,22 @@
 ta-data/
-local
+public
 -ipv4%22);

Update VpcInstanceDataRetriever.java