org.apache.aurora.scheduler.app.LocalServiceRegistryWithOverrides.java Source code

Introduction

Here is the source code for org.apache.aurora.scheduler.app.LocalServiceRegistryWithOverrides.java

Source

/**
 * 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.apache.aurora.scheduler.app;

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.util.Map;

import com.google.common.base.Function;
import com.google.common.base.Optional;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import com.google.inject.Inject;
import com.twitter.common.application.modules.LocalServiceRegistry;

import static java.util.Objects.requireNonNull;

/**
 * Wraps the provided LocalServiceRegistry and optionally overrides the hostname it provides.
 */
public class LocalServiceRegistryWithOverrides {
    public static class Settings {
        private final Optional<String> zkLocalDnsNameOverride;

        public Settings(Optional<String> zkLocalDnsNameOverride) {
            if (zkLocalDnsNameOverride.isPresent()) {
                /* Force resolution of the DNS address passed in to ensure it's valid */
                try {
                    InetAddress.getByName(zkLocalDnsNameOverride.get());
                } catch (UnknownHostException e) {
                    throw new IllegalStateException("Failed to resolve hostname supplied by -hostname", e);
                }
            }
            this.zkLocalDnsNameOverride = zkLocalDnsNameOverride;
        }

        public Optional<String> getZkLocalDnsNameOverride() {
            return zkLocalDnsNameOverride;
        }
    }

    private final LocalServiceRegistry wrapped;
    private final Optional<String> zkLocalDnsNameOverride;

    @Inject
    public LocalServiceRegistryWithOverrides(LocalServiceRegistry registry, Settings settings) {
        this.wrapped = requireNonNull(registry);
        this.zkLocalDnsNameOverride = settings.getZkLocalDnsNameOverride();
    }

    private Map<String, InetSocketAddress> applyDnsOverrides(Map<String, InetSocketAddress> services) {
        final InetAddress inetAddress;
        try {
            inetAddress = InetAddress.getByName(this.zkLocalDnsNameOverride.get());
        } catch (UnknownHostException e) {
            throw new RuntimeException("Failed to resolve address.", e);
        }
        return ImmutableMap
                .copyOf(Maps.transformValues(services, new Function<InetSocketAddress, InetSocketAddress>() {
                    @Override
                    public InetSocketAddress apply(InetSocketAddress input) {
                        return new InetSocketAddress(inetAddress, input.getPort());
                    }
                }));
    }

    public Map<String, InetSocketAddress> getAuxiliarySockets() {
        Map<String, InetSocketAddress> auxSockets = wrapped.getAuxiliarySockets();
        if (zkLocalDnsNameOverride.isPresent()) {
            return applyDnsOverrides(auxSockets);
        } else {
            return auxSockets;
        }
    }
}