org.eclipse.che.workspace.infrastructure.kubernetes.server.KubernetesServerResolver.java Source code

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Here is the source code for org.eclipse.che.workspace.infrastructure.kubernetes.server.KubernetesServerResolver.java

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/*
 * Copyright (c) 2012-2018 Red Hat, Inc.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   Red Hat, Inc. - initial API and implementation
 */
package org.eclipse.che.workspace.infrastructure.kubernetes.server;

import static com.google.common.base.Strings.isNullOrEmpty;

import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.Multimap;
import io.fabric8.kubernetes.api.model.Service;
import io.fabric8.kubernetes.api.model.extensions.Ingress;
import io.fabric8.kubernetes.api.model.extensions.IngressRule;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.eclipse.che.api.core.model.workspace.config.ServerConfig;
import org.eclipse.che.api.core.model.workspace.runtime.ServerStatus;
import org.eclipse.che.api.workspace.server.model.impl.ServerImpl;
import org.eclipse.che.commons.annotation.Nullable;
import org.eclipse.che.workspace.infrastructure.kubernetes.Annotations;

/**
 * Helps to resolve {@link ServerImpl servers} by machine name according to specified {@link Ingress
 * ingresses} and {@link Service services}.
 *
 * <p>Objects annotations are used to check if {@link Service service} or {@link Ingress ingress}
 * exposes the specified machine servers.
 *
 * @author Sergii Leshchenko
 * @author Alexander Garagatyi
 * @see KubernetesServerExposer
 * @see Annotations
 */
public class KubernetesServerResolver {
    private final Multimap<String, Service> services;
    private final Multimap<String, Ingress> ingresses;

    public KubernetesServerResolver(List<Service> services, List<Ingress> ingresses) {
        this.services = ArrayListMultimap.create();
        for (Service service : services) {
            String machineName = Annotations.newDeserializer(service.getMetadata().getAnnotations()).machineName();
            this.services.put(machineName, service);
        }

        this.ingresses = ArrayListMultimap.create();
        for (Ingress ingress : ingresses) {
            String machineName = Annotations.newDeserializer(ingress.getMetadata().getAnnotations()).machineName();
            this.ingresses.put(machineName, ingress);
        }
    }

    /**
     * Resolves servers by the specified machine name.
     *
     * @param machineName machine to resolve servers
     * @return resolved servers
     */
    public Map<String, ServerImpl> resolve(String machineName) {
        Map<String, ServerImpl> servers = new HashMap<>();
        fillInternalServers(machineName, servers);
        fillExternalServers(machineName, servers);
        return servers;
    }

    protected void fillInternalServers(String machineName, Map<String, ServerImpl> servers) {
        services.get(machineName).forEach(service -> fillServiceServers(service, servers));
    }

    protected void fillExternalServers(String machineName, Map<String, ServerImpl> servers) {
        ingresses.get(machineName).forEach(ingress -> fillIngressServers(ingress, servers));
    }

    private void fillServiceServers(Service service, Map<String, ServerImpl> servers) {
        Annotations.newDeserializer(service.getMetadata().getAnnotations()).servers().forEach(
                (name, config) -> servers.put(name, newServer(config.getProtocol(), service.getMetadata().getName(),
                        config.getPort(), config.getPath(), config.getAttributes())));
    }

    private void fillIngressServers(Ingress ingress, Map<String, ServerImpl> servers) {
        IngressRule ingressRule = ingress.getSpec().getRules().get(0);

        // host either set by rule, or determined by LB ip
        final String host = ingressRule.getHost() != null ? ingressRule.getHost()
                : ingress.getStatus().getLoadBalancer().getIngress().get(0).getIp();

        Annotations.newDeserializer(ingress.getMetadata().getAnnotations()).servers().forEach((name, config) -> {
            String path = buildPath(ingressRule.getHttp().getPaths().get(0).getPath(), config.getPath());
            servers.put(name, newServer(config.getProtocol(), host, null, path, config.getAttributes()));
        });
    }

    private String buildPath(String fragment1, @Nullable String fragment2) {
        StringBuilder sb = new StringBuilder(fragment1);

        if (!isNullOrEmpty(fragment2)) {
            if (!fragment1.endsWith("/")) {
                sb.append('/');
            }

            if (fragment2.startsWith("/")) {
                sb.append(fragment2.substring(1));
            } else {
                sb.append(fragment2);
            }
        }

        return sb.toString();
    }

    /** Constructs {@link ServerImpl} instance from provided parameters. */
    protected ServerImpl newServer(String protocol, String host, String port, String path,
            Map<String, String> attributes) {
        StringBuilder ub = new StringBuilder();
        if (protocol != null) {
            ub.append(protocol).append("://");
        } else {
            ub.append("tcp://");
        }
        ub.append(host);
        if (port != null) {
            ub.append(':').append(removeSuffix(port));
        }
        if (path != null) {
            if (!path.isEmpty() && !path.startsWith("/")) {
                ub.append("/");
            }
            ub.append(path);
        }
        return new ServerImpl().withUrl(ub.toString()).withStatus(ServerStatus.UNKNOWN).withAttributes(attributes);
    }

    /** Removes suffix of {@link ServerConfig} such as "/tcp" when port value "8080/tcp". */
    private String removeSuffix(String port) {
        return port.split("/")[0];
    }
}