Object Storage Service:Restore objects

Usage notes

• The RestoreObject operation can be called only on Archive and Cold Archive objects.

• In this topic, the public endpoint of the China (Hangzhou) region is used. If you want to access OSS from other Alibaba Cloud services in the same region as OSS, use an internal endpoint. For more information about OSS regions and endpoints, see Regions and endpoints.

• In this topic, an OSSClient instance is created by using an OSS endpoint. If you want to create an OSSClient instance by using custom domain names or Security Token Service (STS), see Initialization.

• To restore objects, you must have the oss:RestoreObject permission. For more information, see Attach a custom policy to a RAM user.

Restore an Archive object

The following sample code provides an example on how to restore an Archive object:

using Aliyun.OSS;
using Aliyun.OSS.Model;
using Aliyun.OSS.Model;
using System.Net;
using System.Text;

// Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. 
var endpoint = "yourEndpoint";
// Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. 
var accessKeyId = Environment.GetEnvironmentVariable("OSS_ACCESS_KEY_ID");
var accessKeySecret = Environment.GetEnvironmentVariable("OSS_ACCESS_KEY_SECRET");
// Specify the name of the bucket. 
var bucketName = "examplebucket";
// Specify the full path of the object. The path cannot contain the bucket name. 
var objectName = "yourObjectName";
// Specify the content of the object. 
var objectContent = "More than just cloud.";
int maxWaitTimeInSeconds = 600;
// Create an OSSClient instance. 
var client = new OssClient(endpoint, accessKeyId, accessKeySecret);
try
{
    // Create an Archive bucket. 
    var bucket = client.CreateBucket(bucketName, StorageClass.Archive);
    Console.WriteLine("Create Archive bucket succeeded, {0} ", bucket.Name);
}
catch (Exception ex)
{
    Console.WriteLine("Create Archive bucket failed, {0}", ex.Message);
}
// Upload the object to the bucket and set the storage class of the object to Archive. 
try
{
    byte[] binaryData = Encoding.ASCII.GetBytes(objectContent);
    MemoryStream requestContent = new MemoryStream(binaryData);
    client.PutObject(bucketName, objectName, requestContent);
    Console.WriteLine("Put object succeeded, {0}", objectName);
}
catch (Exception ex)
{
    Console.WriteLine("Put object failed, {0}", ex.Message);
}
var metadata = client.GetObjectMetadata(bucketName, objectName);
string storageClass = metadata.HttpMetadata["x-oss-storage-class"] as string;
if (storageClass != "Archive")
{
    Console.WriteLine("StorageClass is {0}", storageClass);
    return;
}
// Restore the Archive object. 
RestoreObjectResult result = client.RestoreObject(bucketName, objectName);
Console.WriteLine("RestoreObject result HttpStatusCode : {0}", result.HttpStatusCode);
if (result.HttpStatusCode != HttpStatusCode.Accepted)
{
    throw new OssException(result.RequestId + ", " + result.HttpStatusCode + " ,");
}
while (maxWaitTimeInSeconds > 0)
{
    var meta = client.GetObjectMetadata(bucketName, objectName);
    string restoreStatus = meta.HttpMetadata["x-oss-restore"] as string;
    if (restoreStatus != null && restoreStatus.StartsWith("ongoing-request=\"false\"", StringComparison.InvariantCultureIgnoreCase))
    {
        break;
    }
    Thread.Sleep(1000);
    // The maximum wait time decreases by 1 second. 
    maxWaitTimeInSeconds--;
}
if (maxWaitTimeInSeconds == 0)
{
    Console.WriteLine("RestoreObject is timeout. ");
    throw new TimeoutException();
}
else
{
    Console.WriteLine("RestoreObject is successful. ");
}

Restore a Cold Archive object

The following code provides an example on how to restore a Cold Archive object:

using Aliyun.OSS;
using Aliyun.OSS.Model;
// Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. 
var endpoint = "yourEndpoint";
// Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. 
var accessKeyId = Environment.GetEnvironmentVariable("OSS_ACCESS_KEY_ID");
var accessKeySecret = Environment.GetEnvironmentVariable("OSS_ACCESS_KEY_SECRET");
// Specify the name of the bucket. 
var bucketName = "examplebucket";
// Specify the full path of the Cold Archive object. Do not include the bucket name in the full path. 
var objectName = "yourObjectName";

// Create an OSSClient instance. 
var client = new OssClient(endpoint, accessKeyId, accessKeySecret);

// Restore the Cold Archive object. 
var request = new RestoreObjectRequest(bucketName, objectName);

// Specify the restoration priority of the Cold Archive object. 
// TierType.Expedited: The object is restored within 1 hour. 
// TierType.Standard: The object is restored within 2 to 5 hours. 
// TierType.Bulk: The object is restored within 5 to 12 hours. 
// Configure restoration parameters. For example, you can set the restoration priority of the object to Expedited, and set the duration for which the object can remain in the restored state to two days. 
// The Days parameter indicates the duration for which the object can remain in the restored state. The default value is 1. This parameter applies to Archive and Cold Archive objects. 
// The Tier parameter indicates the restoration priority of the object and applies only to Cold Archive objects. 
request.Days = 2;
request.Tier = TierType.Bulk;
RestoreObjectResult result = client.RestoreObject(request);
Console.WriteLine("RestoreObject result HttpStatusCode : {0}", result.HttpStatusCode);

References

• For the complete sample code that is used to restore Archive and Cold Archive objects, visit GitHub.

• For more information about the API operation that you can call to restore Archive and Cold Archive objects, see RestoreObject.