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Ec2NameResolver minus commons httpclient

This commit is contained in:
Paul_Loy 2011-05-23 15:54:20 +01:00 committed by kimchy
parent 6a60bbba1d
commit d474025b30
1 changed files with 56 additions and 25 deletions
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83
plugins/cloud/aws/src/main/java/org/elasticsearch/cloud/aws/network/Ec2NameResolver.java
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@ -1,15 +1,30 @@
/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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.elasticsearch.cloud.aws.network;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.text.MessageFormat;
import java.util.HashMap;
import java.util.Map;
import java.net.URL;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.elasticsearch.common.network.NetworkService.CustomNameResolver;
/**
@ -30,7 +45,11 @@ import org.elasticsearch.common.network.NetworkService.CustomNameResolver;
*/
public class Ec2NameResolver implements CustomNameResolver {
// enum that can be added to over time with more meta-data types (such as ipv6 when this is available)
/**
* enum that can be added to over time with more meta-data types (such as ipv6 when this is available)
*
* @author Paul_Loy
*/
private static enum Ec2HostnameType {
PRIVATE_IPv4("_ec2:privateIpv4_", "local-ipv4"),
@ -38,6 +57,7 @@ public class Ec2NameResolver implements CustomNameResolver {
PUBLIC_IPv4 ("_ec2:publicIpv4_", "public-ipv4"),
PUBLIC_DNS ("_ec2:publicDns_", "public-hostname"),
// some less verbose defaults
PUBLIC_IP ("_ec2:publicIp_", PUBLIC_IPv4.ec2Name),
PRIVATE_IP ("_ec2:privateIp_", PRIVATE_IPv4.ec2Name),
DEFAULT ("_ec2", PRIVATE_IPv4.ec2Name);
@ -54,43 +74,54 @@ public class Ec2NameResolver implements CustomNameResolver {
private static final String EC2_METADATA_URL = "http://169.254.169.254/latest/meta-data/";
private final Ec2HostnameType type;
/**
* Construct a {@link CustomNameResolver} with the given {@link Ec2HostnameType}
* address type.
*
* @param addressType the type of ec2 host to bind to.
*/
public Ec2NameResolver(Ec2HostnameType addressType) {
this.type = addressType;
public Ec2NameResolver() {
}
/**
* @return the appropriate host resolved from ec2 meta-data.
* @throws IOException if ec2 meta-data cannot be obtained.
*
* @see CustomNameResolver#resolve()
* @see CustomNameResolver#resolveIfPossible(String)
*/
@Override
public InetAddress resolve() throws IOException {
String ec2Url = EC2_METADATA_URL + this.type.ec2Name;
GetMethod ec2MetadataRequest = new GetMethod(ec2Url);
public InetAddress resolve(Ec2HostnameType type) throws IOException {
int status = new HttpClient().executeMethod(ec2MetadataRequest);
if (status != 200) {
throw new HttpException(MessageFormat.format("unable to retrieve ec2 metadata from {0}. Response: {1} {2}", ec2Url, status, HttpStatus.getStatusText(status)));
URL url = new URL(EC2_METADATA_URL + type.ec2Name);
BufferedReader urlReader = new BufferedReader(new InputStreamReader(url.openStream()));
String metadataResult = urlReader.readLine();
if (metadataResult == null || metadataResult.length() == 0) {
throw new IOException("no ec2 metadata returned from :" + url);
}
String metadataResult = ec2MetadataRequest.getResponseBodyAsString();
return InetAddress.getByName(metadataResult);
}
public static Map<String, CustomNameResolver> resolvers() {
Map<String, CustomNameResolver> resolvers = new HashMap<String, CustomNameResolver>();
for (Ec2HostnameType type : Ec2HostnameType.values()) {
resolvers.put(type.configName, new Ec2NameResolver(type));
/*
* (non-Javadoc)
* @see org.elasticsearch.common.network.NetworkService.CustomNameResolver#resolveDefault()
*/
@Override
public InetAddress resolveDefault() throws IOException {
return resolve(Ec2HostnameType.DEFAULT);
}
return resolvers;
/*
* (non-Javadoc)
* @see org.elasticsearch.common.network.NetworkService.CustomNameResolver#resolveIfPossible(java.lang.String)
*/
@Override
public InetAddress resolveIfPossible(String value) throws IOException {
for (Ec2HostnameType type : Ec2HostnameType.values()) {
if (type.configName.equals(value)) {
return resolve(type);
}
}
return null;
}
}