hadoop IAMInstanceCredentialsProvider 源码
haddop IAMInstanceCredentialsProvider 代码
文件路径：/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/auth/IAMInstanceCredentialsProvider.java
/*
* 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.hadoop.fs.s3a.auth;
import java.io.Closeable;
import java.io.IOException;
import com.amazonaws.AmazonClientException;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.AWSCredentialsProvider;
import com.amazonaws.auth.EC2ContainerCredentialsProviderWrapper;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/**
* This is an IAM credential provider which wraps
* an {@code EC2ContainerCredentialsProviderWrapper}
* to provide credentials when the S3A connector is instantiated on AWS EC2
* or the AWS container services.
* <p>
* When it fails to authenticate, it raises a
* {@link NoAwsCredentialsException} which can be recognized by retry handlers
* as a non-recoverable failure.
* <p>
* It is implicitly public; marked evolving as we can change its semantics.
*
* @deprecated This class will be replaced by one that implements AWS SDK V2's AwsCredentialProvider
* as part of upgrading S3A to SDK V2. See HADOOP-18073.
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
@Deprecated
public class IAMInstanceCredentialsProvider
implements AWSCredentialsProvider, Closeable {
private final AWSCredentialsProvider provider =
new EC2ContainerCredentialsProviderWrapper();
public IAMInstanceCredentialsProvider() {
}
/**
* Ask for the credentials.
* Failure invariably means "you aren't running in an EC2 VM or AWS container".
* @return the credentials
* @throws NoAwsCredentialsException on auth failure to indicate non-recoverable.
*/
@Override
public AWSCredentials getCredentials() {
try {
return provider.getCredentials();
} catch (AmazonClientException e) {
throw new NoAwsCredentialsException("IAMInstanceCredentialsProvider",
e.getMessage(),
e);
}
}
@Override
public void refresh() {
provider.refresh();
}
@Override
public void close() throws IOException {
// no-op.
}
}
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