AmazonEc2InstanceUserTagsFactoryBean.java

/*
 * Copyright 2013-2014 the original author or authors.
 *
 * 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 org.springframework.cloud.aws.core.env.ec2;

import com.amazonaws.services.ec2.AmazonEC2;
import com.amazonaws.services.ec2.model.DescribeTagsRequest;
import com.amazonaws.services.ec2.model.DescribeTagsResult;
import com.amazonaws.services.ec2.model.Filter;
import com.amazonaws.services.ec2.model.TagDescription;
import org.springframework.beans.factory.config.AbstractFactoryBean;
import org.springframework.cloud.aws.core.support.documentation.RuntimeUse;

import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;

/**
 * @author Agim Emruli
 */
public class AmazonEc2InstanceUserTagsFactoryBean extends AbstractFactoryBean<Map<String, String>> {

    private final AmazonEC2 amazonEc2;
    private final InstanceIdProvider idProvider;

    @RuntimeUse
    public AmazonEc2InstanceUserTagsFactoryBean(AmazonEC2 amazonEc2) {
        this(amazonEc2, new AmazonEc2InstanceIdProvider());
    }

    public AmazonEc2InstanceUserTagsFactoryBean(AmazonEC2 amazonEc2, InstanceIdProvider idProvider) {
        this.amazonEc2 = amazonEc2;
        this.idProvider = idProvider;
    }

    @Override
    public Class<?> getObjectType() {
        return Map.class;
    }

    @Override
    protected Map<String, String> createInstance() throws Exception {
        LinkedHashMap<String, String> properties = new LinkedHashMap<>();
        DescribeTagsResult tags = this.amazonEc2.describeTags(new DescribeTagsRequest().withFilters(
                new Filter("resource-id", Collections.singletonList(this.idProvider.getCurrentInstanceId())),
                new Filter("resource-type", Collections.singletonList("instance"))));
        for (TagDescription tag : tags.getTags()) {
            properties.put(tag.getKey(), tag.getValue());
        }
        return properties;
    }
}