io.micronaut.discovery.cloud.aws.EC2MetadataKeys Maven / Gradle / Ivy
/*
* Copyright 2017-2019 original authors
*
* 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 io.micronaut.discovery.cloud.aws;
import java.net.MalformedURLException;
import java.net.URL;
/**
* A enum of Amazon EC2 metadata.
*
* @author rvanderwerf
* @author Graeme Rocher
* @since 1.0
*/
public enum EC2MetadataKeys {
instanceId("instance-id"), // always have this first as we use it as a fail fast mechanism
amiId("ami-id"),
region("region"),
instanceType("instance-type"),
localIpv4("local-ipv4"),
localHostname("local-hostname"),
availabilityZone("availability-zone", "placement/"),
publicHostname("public-hostname"),
publicIpv4("public-ipv4"),
mac("mac"), // mac is declared above vpcId so will be found before vpcId (where it is needed)
vpcId("vpc-id", "network/interfaces/macs/") {
@Override
public URL getURL(String prepend, String mac) throws MalformedURLException {
return new URL(AWS_METADATA_URL + this.path + mac + "/" + getName());
}
},
accountId("accountId");
public static final String AWS_API_VERSION = "latest";
public static final String AWS_METADATA_URL = "http://169.254.169.254/" + AWS_API_VERSION + "/meta-data/";
protected String path;
private String name;
/**
* Construct a EC2 Metadata key with the given name.
*
* @param name The name of key
*/
EC2MetadataKeys(String name) {
this(name, "");
}
/**
* Construct EC2 Metadata key with given name and path.
*
* @param name The name of key
* @param path The path in EC2 Metadata
*/
EC2MetadataKeys(String name, String path) {
this.name = name;
this.path = path;
}
/**
* @return The name of key
*/
public String getName() {
return name;
}
/**
* The URL for metadata information.
* Override to apply prepend and append.
*
* @param prepend Building the URL endpoints
* @param append Region
* @return The URL for the Metadata information of specific {@link #name}.
* @throws MalformedURLException If the URL is invalid
*/
public URL getURL(String prepend, String append) throws MalformedURLException {
return new URL(AWS_METADATA_URL + path + name);
}
/**
* Returns the name of this enum constant, as contained in the
* declaration. This method may be overridden, though it typically
* isn't necessary or desirable. An enum type should override this
* method when a more "programmer-friendly" string form exists.
*
* @return the name of this enum constant
*/
@Override
public String toString() {
return getName();
}
}