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SDK for Microsoft Azure Storage Clients
/**
* Copyright Microsoft Corporation
*
* 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 com.microsoft.azure.storage;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URI;
import javax.xml.stream.XMLStreamException;
import com.microsoft.azure.storage.core.BaseRequest;
import com.microsoft.azure.storage.core.RequestLocationMode;
import com.microsoft.azure.storage.core.SR;
import com.microsoft.azure.storage.core.StorageRequest;
import com.microsoft.azure.storage.core.StreamMd5AndLength;
import com.microsoft.azure.storage.core.Utility;
/**
* Provides a client for accessing the Microsoft Azure Storage service.
*/
public abstract class ServiceClient {
/**
* Holds the list of URIs for all locations.
*/
private StorageUri storageUri;
/**
* Holds the StorageCredentials associated with this Service Client.
*/
protected StorageCredentials credentials;
/**
* Reserved for internal use. An internal flag which indicates if path style uris should be used.
*/
private boolean usePathStyleUris;
/**
* Creates an instance of the ServiceClient class using the specified service endpoint and account
* credentials.
*
* @param storageUri
* A {@link StorageUri} object which represents the service endpoint used to create the client.
* @param credentials
* A {@link StorageCredentials} object which represents the account credentials.
*/
protected ServiceClient(final StorageUri storageUri, final StorageCredentials credentials) {
Utility.assertNotNull("baseUri", storageUri);
if (!storageUri.isAbsolute()) {
throw new IllegalArgumentException(String.format(SR.RELATIVE_ADDRESS_NOT_PERMITTED, storageUri));
}
this.credentials = credentials == null ? StorageCredentialsAnonymous.ANONYMOUS : credentials;
this.usePathStyleUris = Utility.determinePathStyleFromUri(storageUri.getPrimaryUri());
this.storageUri = storageUri;
}
protected StorageRequest downloadServicePropertiesImpl(
final RequestOptions options, final boolean signAsTable) {
final StorageRequest getRequest = new StorageRequest(
options, this.getStorageUri()) {
@Override
public HttpURLConnection buildRequest(ServiceClient client, Void parentObject, OperationContext context)
throws Exception {
return BaseRequest.getServiceProperties(
credentials.transformUri(client.getEndpoint()), options, null, context);
}
@Override
public void signRequest(HttpURLConnection connection, ServiceClient client, OperationContext context)
throws Exception {
if (signAsTable) {
StorageRequest.signTableRequest(connection, client, -1, context);
}
else {
StorageRequest.signBlobQueueAndFileRequest(connection, client, -1, context);
}
}
@Override
public ServiceProperties preProcessResponse(Void parentObject, ServiceClient client,
OperationContext context) throws Exception {
if (this.getResult().getStatusCode() != HttpURLConnection.HTTP_OK) {
this.setNonExceptionedRetryableFailure(true);
}
return null;
}
@Override
public ServiceProperties postProcessResponse(HttpURLConnection connection, Void parentObject,
ServiceClient client, OperationContext context, ServiceProperties storageObject) throws Exception {
return ServicePropertiesHandler.readServicePropertiesFromStream(connection.getInputStream());
}
};
return getRequest;
}
protected StorageRequest getServiceStatsImpl(final RequestOptions options,
final boolean signAsTable) {
final StorageRequest getRequest = new StorageRequest(
options, this.getStorageUri()) {
@Override
public void setRequestLocationMode() {
this.applyLocationModeToRequest();
this.setRequestLocationMode(RequestLocationMode.PRIMARY_OR_SECONDARY);
}
@Override
public HttpURLConnection buildRequest(ServiceClient client, Void parentObject, OperationContext context)
throws Exception {
return BaseRequest.getServiceStats(
credentials.transformUri(client.getStorageUri().getUri(this.getCurrentLocation())),
options, null, context);
}
@Override
public void signRequest(HttpURLConnection connection, ServiceClient client, OperationContext context)
throws Exception {
if (signAsTable) {
StorageRequest.signTableRequest(connection, client, -1, context);
}
else {
StorageRequest.signBlobQueueAndFileRequest(connection, client, -1, context);
}
}
@Override
public ServiceStats preProcessResponse(Void parentObject, ServiceClient client, OperationContext context)
throws Exception {
if (this.getResult().getStatusCode() != HttpURLConnection.HTTP_OK) {
this.setNonExceptionedRetryableFailure(true);
}
return null;
}
@Override
public ServiceStats postProcessResponse(HttpURLConnection connection, Void parentObject,
ServiceClient client, OperationContext context, ServiceStats storageObject) throws Exception {
return ServiceStatsHandler.readServiceStatsFromStream(connection.getInputStream());
}
};
return getRequest;
}
/**
* Returns the storage credentials associated with this service client.
*
* @return A {@link StorageCredentials} object which represents the storage credentials associated with this client.
*/
public final StorageCredentials getCredentials() {
return this.credentials;
}
/**
* Returns the base URI for this service client.
*
* @return A java.net.URI object which represents the base URI for the service client.
*/
public final URI getEndpoint() {
return this.storageUri.getPrimaryUri();
}
/**
* Returns the list of URIs for all locations.
*
* @return A {@link StorageUri} object which represents the list of URIs for all locations.
*/
public final StorageUri getStorageUri() {
return this.storageUri;
}
/**
* @return true if path-style URIs are used; otherwise, false.
*/
protected boolean isUsePathStyleUris() {
return this.usePathStyleUris;
}
/**
* Sets the credentials to use with this service client.
*
* @param credentials
* A {@link StorageCredentials} object which represents the credentials being assigned for the service
* client.
*/
protected final void setCredentials(final StorageCredentials credentials) {
this.credentials = credentials;
}
/**
* Sets the list of URIs for all locations.
*
* @param storageUri
* A {@link StorageUri} object which represents the list of URIs for all locations.
*/
protected final void setStorageUri(final StorageUri storageUri) {
this.usePathStyleUris = Utility.determinePathStyleFromUri(storageUri.getPrimaryUri());
this.storageUri = storageUri;
}
protected StorageRequest uploadServicePropertiesImpl(final ServiceProperties properties,
final RequestOptions options, final OperationContext opContext, final boolean signAsTable)
throws StorageException {
try {
byte[] propertiesBytes = ServicePropertiesSerializer.serializeToByteArray(properties);
final ByteArrayInputStream sendStream = new ByteArrayInputStream(propertiesBytes);
final StreamMd5AndLength descriptor = Utility.analyzeStream(sendStream, -1L, -1L,
true /* rewindSourceStream */, true /* calculateMD5 */);
final StorageRequest putRequest = new StorageRequest(
options, this.getStorageUri()) {
@Override
public HttpURLConnection buildRequest(ServiceClient client, Void parentObject, OperationContext context)
throws Exception {
this.setSendStream(sendStream);
this.setLength(descriptor.getLength());
return BaseRequest.setServiceProperties(
credentials.transformUri(client.getEndpoint()), options, null, context);
}
@Override
public void setHeaders(HttpURLConnection connection, Void parentObject, OperationContext context) {
connection.setRequestProperty(Constants.HeaderConstants.CONTENT_MD5, descriptor.getMd5());
}
@Override
public void signRequest(HttpURLConnection connection, ServiceClient client, OperationContext context)
throws Exception {
if (signAsTable) {
StorageRequest.signTableRequest(connection, client, descriptor.getLength(), context);
}
else {
StorageRequest.signBlobQueueAndFileRequest(connection, client, descriptor.getLength(), context);
}
}
@Override
public Void preProcessResponse(Void parentObject, ServiceClient client, OperationContext context)
throws Exception {
if (this.getResult().getStatusCode() != HttpURLConnection.HTTP_ACCEPTED) {
this.setNonExceptionedRetryableFailure(true);
}
return null;
}
@Override
public void recoveryAction(OperationContext context) throws IOException {
sendStream.reset();
sendStream.mark(Constants.MAX_MARK_LENGTH);
}
};
return putRequest;
}
catch (IllegalArgumentException e) {
// to do : Move this to multiple catch clause so we can avoid the duplicated code once we move to Java 1.7.
// The request was not even made. There was an error while trying to read the permissions. Just throw.
StorageException translatedException = StorageException.translateClientException(e);
throw translatedException;
}
catch (XMLStreamException e) {
// The request was not even made. There was an error while trying to read the serviceProperties and write to stream. Just throw.
StorageException translatedException = StorageException.translateClientException(e);
throw translatedException;
}
catch (IOException e) {
// The request was not even made. There was an error while trying to read the serviceProperties and write to stream. Just throw.
StorageException translatedException = StorageException.translateClientException(e);
throw translatedException;
}
}
/**
* Gets the {@link RequestOptions} that is used for requests associated with this ServiceClient
*
* @return The {@link RequestOptions} object containing the values used by this ServiceClient
*/
public abstract RequestOptions getDefaultRequestOptions();
}