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Discovery server
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/*
 * Copyright 2010 Proofpoint, Inc.
 *
 * 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 com.proofpoint.discovery;

import com.google.common.collect.ImmutableList;
import com.google.inject.Binder;
import com.google.inject.Key;
import com.google.inject.Provides;
import com.google.inject.Scopes;
import com.proofpoint.configuration.AbstractConfigurationAwareModule;
import com.proofpoint.discovery.client.ServiceDescriptor;
import com.proofpoint.discovery.client.ServiceInventory;
import com.proofpoint.discovery.client.ServiceSelector;
import com.proofpoint.discovery.store.DistributedStore;
import com.proofpoint.discovery.store.InMemoryStore;
import com.proofpoint.discovery.store.ReplicatedStoreModule;
import com.proofpoint.node.NodeInfo;

import javax.inject.Singleton;
import java.util.List;
import java.util.concurrent.ScheduledExecutorService;

import static com.proofpoint.audit.AuditLoggerBinder.auditLoggerBinder;
import static com.proofpoint.concurrent.Threads.daemonThreadsNamed;
import static com.proofpoint.configuration.ConfigBinder.bindConfig;
import static com.proofpoint.discovery.client.DiscoveryBinder.discoveryBinder;
import static com.proofpoint.http.client.HttpClientBinder.httpClientBinder;
import static com.proofpoint.jaxrs.JaxrsBinder.jaxrsBinder;
import static java.util.concurrent.Executors.newSingleThreadScheduledExecutor;

public class DiscoveryServerModule
        extends AbstractConfigurationAwareModule
{
    @Override
    public void setup(Binder binder)
    {
        bindConfig(binder).bind(DiscoveryConfig.class);
        jaxrsBinder(binder).bind(ServiceResource.class).withApplicationPrefix();
        binder.bind(InitializationTracker.class).in(Scopes.SINGLETON);

        discoveryBinder(binder).bindHttpAnnouncement("discovery");

        // dynamic announcements
        jaxrsBinder(binder).bind(DynamicAnnouncementResource.class).withApplicationPrefix();
        binder.bind(DynamicStore.class).to(Key.get(DistributedStore.class, ForDynamicStore.class)).in(Scopes.SINGLETON);
        binder.install(new ReplicatedStoreModule("dynamic", ForDynamicStore.class, InMemoryStore.class));

        // config-based static announcements
        binder.bind(ConfigStore.class).in(Scopes.SINGLETON);
        bindConfig(binder).bind(ConfigStoreConfig.class);

        // proxy announcements
        DiscoveryConfig discoveryConfig = buildConfigObject(DiscoveryConfig.class);
        if (!discoveryConfig.getProxyUris().isEmpty()) {
            httpClientBinder(binder).bindBalancingHttpClient("discovery.proxy", ForProxyStore.class, discoveryConfig.getProxyUris());
        }
        binder.bind(ProxyStore.class).in(Scopes.SINGLETON);

        if (discoveryConfig.isEnforceHostIpMapping()) {
            binder.bind(ScheduledExecutorService.class).annotatedWith(ForAuthManager.class)
                    .toInstance(newSingleThreadScheduledExecutor(daemonThreadsNamed("auth-manager")));
            binder.bind(AuthManager.class).to(IpHostnameAuthManager.class).in(Scopes.SINGLETON);
            auditLoggerBinder(binder).bind(AuthAuditRecord.class);
        }
        else {
            binder.bind(AuthManager.class).to(AllowAllAuthManager.class).in(Scopes.SINGLETON);
        }
    }

    @Singleton
    @Provides
    public static ServiceSelector getServiceInventory(final ServiceInventory inventory, final NodeInfo nodeInfo)
    {
        return new ServiceSelector()
        {
            @Override
            public String getType()
            {
                return "discovery";
            }

            @Override
            public String getPool()
            {
                return nodeInfo.getPool();
            }

            @Override
            public List selectAllServices()
            {
                return ImmutableList.copyOf(inventory.getServiceDescriptors(getType()));
            }
        };
    }
}