node-repository/src/main/java/com/yahoo/vespa/hosted/provision/provisioning/ContainerImages.java


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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.provision.provisioning;

import com.yahoo.config.provision.DockerImage;
import com.yahoo.config.provision.NodeType;
import com.yahoo.vespa.hosted.provision.Node;

import java.util.Objects;
import java.util.Optional;

/**
 * This class decides the container image to use for a given node. Two sources are considered, in the following order:
 *
 * 1. Requested image (from node allocation, this is set by either a feature flag or through services.xml)
 * 2. Default image, specified in the node repository config file
 *
 * Independent of source, the registry part of the image is rewritten to match the one set in the node repository config
 * file.
 *
 * @author freva
 * @author mpolden
 */
public class ContainerImages {

    private final DockerImage defaultImage;
    private final Optional<DockerImage> tenantImage;

    public ContainerImages(DockerImage defaultImage, Optional<DockerImage> tenantContainerImage) {
        this.defaultImage = Objects.requireNonNull(defaultImage);
        this.tenantImage = Objects.requireNonNull(tenantContainerImage);
    }

    /** Returns the container image to use for given node */
    public DockerImage get(Node node) {
        Optional<DockerImage> requestedImage = node.allocation()
                                                   .flatMap(allocation -> allocation.membership().cluster().dockerImageRepo());
        NodeType nodeType = node.type().isHost() ? node.type().childNodeType() : node.type();
        final DockerImage image;
        if (requestedImage.isPresent()) {
            image = requestedImage.get();
        } else if (nodeType == NodeType.tenant) {
            image = tenantImage.orElse(defaultImage);
        } else {
            image = defaultImage;
        }
        return rewriteRegistry(image);
    }

    /** Rewrite the registry part of given image, using this zone's default image */
    private DockerImage rewriteRegistry(DockerImage image) {
        return image.withRegistry(defaultImage.registry());
    }

}