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.immutable.ArrayMap;
import com.jcabi.log.Logger;
import com.jcabi.xml.XML;
import com.thindeck.api.Agent;
import java.io.IOException;
import java.util.Collection;
import org.xembly.Directive;
import org.xembly.Directives;

/**
 * Remove all waste images.
 *
 * @author Yegor Bugayenko (yegor256@gmail.com)
 * @version $Id$
 * @since 0.5
 */
@Immutable
public final class RemoveImages implements Agent {

    /**
     * Script to use.
     */
    private final transient Script script;

    /**
     * Ctor.
     * @throws IOException If fails
     */
    public RemoveImages() throws IOException {
        this(
            new Script.Default(
                RemoveImages.class.getResource("remove-image.sh")
            )
        );
    }

    /**
     * Ctor.
     * @param spt Script.
     */
    public RemoveImages(final Script spt) {
        this.script = spt;
    }

    @Override
    public Iterable<Directive> exec(final XML deck) throws IOException {
        final Collection<String> images = deck.xpath(
            // @checkstyle LineLength (1 line)
            "/deck/images/image[@waste and not(name=/deck/containers/container/image)]/name/text()"
        );
        final Directives dirs = new Directives();
        for (final String image : images) {
            Logger.info(
                this, "Docker image %s is waste, has to be removed",
                image
            );
            this.remove(image);
            dirs.xpath(
                String.format(
                    "/deck/images/image[name='%s']",
                    image
                )
            ).remove();
        }
        return dirs;
    }

    /**
     * Remove image.
     * @param name Name of image
     * @throws IOException If fails
     */
    private void remove(final String name) throws IOException {
        this.script.exec(
            "t1.thindeck.com",
            new ArrayMap<String, String>().with("image", name)
        );
        Logger.info(
            StartDocker.class,
            "Docker image %s removed", name
        );
    }

}