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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.cassandra.locator;

import java.io.IOException;

import com.google.common.collect.ImmutableMap;

import org.apache.cassandra.locator.AbstractCloudMetadataServiceConnector.DefaultCloudMetadataServiceConnector;

import static org.apache.cassandra.locator.AbstractCloudMetadataServiceConnector.METADATA_URL_PROPERTY;

/**
 * A snitch that assumes an GCE region is a DC and an GCE availability_zone
 * is a rack. This information is available in the config for the node.
 */
public class GoogleCloudSnitch extends AbstractCloudMetadataServiceSnitch
{
    static final String DEFAULT_METADATA_SERVICE_URL = "http://metadata.google.internal";
    static final String ZONE_NAME_QUERY_URL = "/computeMetadata/v1/instance/zone";

    public GoogleCloudSnitch() throws IOException
    {
        this(new SnitchProperties());
    }

    public GoogleCloudSnitch(SnitchProperties properties) throws IOException
    {
        this(new DefaultCloudMetadataServiceConnector(properties.putIfAbsent(METADATA_URL_PROPERTY,
                                                                             DEFAULT_METADATA_SERVICE_URL)));
    }

    public GoogleCloudSnitch(AbstractCloudMetadataServiceConnector connector) throws IOException
    {
        super(connector, SnitchUtils.parseDcAndRack(connector.apiCall(ZONE_NAME_QUERY_URL,
                                                                      ImmutableMap.of("Metadata-Flavor", "Google")),
                                                    connector.getProperties().getDcSuffix()));
    }
}