yegor256/thindeck

/**
 * Copyright (c) 2014-2019, Thindeck.com
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met: 1) Redistributions of source code must retain the above
 * copyright notice, this list of conditions and the following
 * disclaimer. 2) Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following
 * disclaimer in the documentation and/or other materials provided
 * with the distribution. 3) Neither the name of the thindeck.com nor
 * the names of its contributors may be used to endorse or promote
 * products derived from this software without specific prior written
 * permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.thindeck.agents;

import com.jcabi.aspects.Immutable;
import com.jcabi.aspects.Tv;
import com.jcabi.log.Logger;
import com.jcabi.xml.XML;
import com.thindeck.api.Agent;
import java.io.IOException;
import java.text.ParseException;
import java.util.Collection;
import java.util.Date;
import java.util.concurrent.TimeUnit;
import org.apache.commons.lang3.time.DateFormatUtils;
import org.xembly.Directive;
import org.xembly.Directives;

/**
 * Remove repo if it's too old and still has no images.
 *
 * @author Yegor Bugayenko (yegor256@gmail.com)
 * @version $Id$
 * @since 0.1
 */
@Immutable
public final class WipeRepo implements Agent {

    @Override
    public Iterable<Directive> exec(final XML deck) throws IOException {
        final Collection<XML> images = deck.nodes(
            "/deck/images/image[repo=/deck/repo/name]"
        );
        final Directives dirs = new Directives();
        if (images.isEmpty() && !deck.nodes("/deck/repo/name").isEmpty()) {
            final Date today = new Date();
            final int age;
            try {
                age = (int) ((today.getTime()
                    - DateFormatUtils.ISO_DATETIME_FORMAT.parse(
                        deck.xpath("/deck/repo/@added").get(0)
                    ).getTime()) / TimeUnit.MINUTES.toMillis(1L));
            } catch (final ParseException ex) {
                throw new IOException(ex);
            }
            if (age > Tv.TEN) {
                Logger.info(
                    this, "Repo %s still has no images for over %d mins",
                    deck.xpath("/deck/repo/uri/text()"), age
                );
                dirs.xpath("/deck/repo").remove();
            }
        }
        return dirs;
    }

}