org.jclouds.aws.ec2.util.EC2Utils.java Source code

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Here is the source code for org.jclouds.aws.ec2.util.EC2Utils.java

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/**
 *
 * Copyright (C) 2010 Cloud Conscious, LLC. <info@cloudconscious.com>
 *
 * ====================================================================
 * 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.jclouds.aws.ec2.util;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static org.jclouds.http.HttpUtils.addFormParamTo;

import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.inject.Singleton;

import org.jclouds.aws.domain.Region;
import org.jclouds.aws.ec2.domain.AvailabilityZone;
import org.jclouds.aws.ec2.domain.RunningInstance;
import org.jclouds.aws.ec2.services.InstanceClient;
import org.jclouds.domain.Location;
import org.jclouds.domain.LocationScope;
import org.jclouds.http.HttpRequest;
import org.jclouds.rest.internal.GeneratedHttpRequest;

import com.google.common.base.Function;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Iterables;

/**
 * 
 * @author Adrian Cole
 */
public class EC2Utils {
    @Singleton
    public static class GetRegionFromLocation implements Function<Location, String> {
        public String apply(Location location) {
            String region = location.getScope() == LocationScope.REGION ? location.getId()
                    : location.getParent().getId();
            return region;
        }
    }

    public static String[] getAvailabilityZonesForRegion(String region) {
        Set<String> availabilityZones = new HashSet<String>();
        for (String az : AvailabilityZone.zones) {
            if (az.startsWith(region))
                availabilityZones.add(az);
        }

        return (String[]) availabilityZones.toArray(new String[availabilityZones.size()]);
    }

    public static void indexStringArrayToFormValuesWithPrefix(HttpRequest request, String prefix, Object input) {
        checkArgument(checkNotNull(input, "input") instanceof String[],
                "this binder is only valid for String[] : " + input.getClass());
        String[] values = (String[]) input;
        for (int i = 0; i < values.length; i++) {
            addFormParamTo(request, prefix + "." + (i + 1),
                    checkNotNull(values[i], prefix.toLowerCase() + "s[" + i + "]"));
        }
    }

    public static Iterable<RunningInstance> getAllRunningInstancesInRegion(InstanceClient client, String region,
            String id) {
        return Iterables.concat(client.describeInstancesInRegion(region, id));
    }

    public static String[] parseHandle(String id) {
        String[] parts = checkNotNull(id, "id").split("/");
        checkArgument(parts.length == 2, "id syntax is region/instanceid");
        return parts;
    }

    public static void indexIterableToFormValuesWithPrefix(HttpRequest request, String prefix, Object input) {
        checkArgument(checkNotNull(input, "input") instanceof Iterable<?>,
                "this binder is only valid for Iterable<?>: " + input.getClass());
        Iterable<?> values = (Iterable<?>) input;
        int i = 0;
        for (Object o : values) {
            addFormParamTo(request, prefix + "." + (i++ + 1),
                    checkNotNull(o.toString(), prefix.toLowerCase() + "s[" + i + "]"));
        }
    }

    public static String findRegionInArgsOrNull(GeneratedHttpRequest<?> gRequest) {
        for (Object arg : gRequest.getArgs()) {
            if (arg instanceof String) {
                String regionName = (String) arg;
                if (isRegion(regionName))
                    return regionName;
            }
        }
        return null;
    }

    public static boolean isRegion(String regionName) {
        return Region.EU_WEST_1.equals(regionName) || Region.US_WEST_1.equals(regionName)
                || Region.US_EAST_1.equals(regionName) || Region.US_STANDARD.equals(regionName)
                || Region.AP_SOUTHEAST_1.equals(regionName);
    }

    public static String findAvailabilityZoneInArgsOrNull(GeneratedHttpRequest<?> gRequest) {
        for (Object arg : gRequest.getArgs()) {
            if (arg instanceof String) {
                String zone = (String) arg;
                if (AvailabilityZone.zones.contains(zone))
                    return zone;
            }
        }
        return null;
    }

    public static void indexStringArrayToFormValuesWithStringFormat(HttpRequest request, String format,
            Object input) {
        checkArgument(checkNotNull(input, "input") instanceof String[],
                "this binder is only valid for String[] : " + input.getClass());
        String[] values = (String[]) input;
        for (int i = 0; i < values.length; i++) {
            addFormParamTo(request, String.format(format, (i + 1)),
                    checkNotNull(values[i], format.toLowerCase() + "s[" + i + "]"));
        }
    }

    private static final Pattern ELB_PATTERN = Pattern.compile("([^.]+)-[^.]+\\.([^.]+)\\.elb\\.amazonaws\\.com");

    public static Map<String, String> getLoadBalancerNameAndRegionFromDnsName(String dnsName) {
        Matcher matcher = ELB_PATTERN.matcher(checkNotNull(dnsName, "dnsName"));
        checkArgument(matcher.find(), "dnsName syntax is " + ELB_PATTERN + " didn't match: " + dnsName);
        String loadBalancerName = matcher.group(1);
        String regionName = matcher.group(2);
        checkArgument((isRegion(regionName)),
                String.format("Region (%s)  parsed from (%s) is not a valid region", regionName, dnsName));
        return ImmutableMap.<String, String>of(regionName, loadBalancerName);
    }
}