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Convert the storage classes of objects using OSS SDK for Python 1.0

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Object Storage Service (OSS) provides the following storage classes to cover various data storage scenarios from hot data to cold data: Standard, Infrequent Access (IA), Archive, Cold Archive, and Deep Cold Archive. In OSS, once an object is created, its content cannot be modified. If you want to convert the storage class of an object, you must use the Bucket.CopyObject method to copy the object to create a new object and convert the storage class of the new object.

Usage notes

  • 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, access credentials are obtained from environment variables. For more information about how to configure access credentials, see Configure access credentials using OSS SDK for Python 1.0.

  • This topic demonstrates creating an OSSClient instance with an OSS endpoint. For alternative configurations, such as using a custom domain or authenticating with credentials from Security Token Service (STS), see Initialization.

  • To convert the storage class of an object, you must have the oss:GetObject, oss:PutObject, and oss:RestoreObject permissions. For more information, see Grant a custom policy.

Examples

Important

If you convert the storage class of an IA, Archive, Cold Archive, or Deep Cold Archive object or delete the object before the minimum storage duration elapses, you are charged for the storage usage of the object that is stored for less than the minimum storage duration. For more information, see How am I charged for objects whose storage duration is less than the minimum storage duration?

Convert the storage class of an object from Standard or IA to Archive, Cold Archive, or Deep Cold Archive

The following sample code converts the storage class of an object from Standard or IA to Archive, Cold Archive, or Deep Cold Archive: 

# -*- coding: utf-8 -*-
import oss2
from oss2.credentials import EnvironmentVariableCredentialsProvider
import os
# 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. 
auth = oss2.ProviderAuthV4(EnvironmentVariableCredentialsProvider())

# Specify the endpoint of the bucket region (for example: https://oss-cn-hangzhou.aliyuncs.com). 
endpoint = "https://oss-cn-hangzhou.aliyuncs.com"

# Specify the ID of the region that maps to the endpoint. Example: cn-hangzhou. This parameter is required if you use the signature algorithm V4.
region = "cn-hangzhou"

# Specify the name of your bucket.
bucket = oss2.Bucket(auth, endpoint, "yourBucketName", region=region)

# Specify the full path of the object. Do not include the bucket name in the full path. Example: exampledir/exampleobject.txt. 
# Make sure that the storage class of the object is Standard or IA. 
object_name = 'exampledir/exampleobject.txt'

# Convert the storage class of the object to Archive by setting the x-oss-storage-class header to oss2.BUCKET_STORAGE_CLASS_ARCHIVE. 
headers = {'x-oss-storage-class': oss2.BUCKET_STORAGE_CLASS_ARCHIVE}
# Convert the storage class of the object to Cold Archive by setting the x-oss-storage-class header to oss2.BUCKET_STORAGE_CLASS_COLD_ARCHIVE. 
# headers = {'x-oss-storage-class': oss2.BUCKET_STORAGE_CLASS_COLD_ARCHIVE}
# Convert the storage class of the object to Deep Cold Archive by setting the x-oss-storage-class header to BUCKET_STORAGE_CLASS_DEEP_COLD_ARCHIVE 
# headers = {'x-oss-storage-class': oss2.models.BUCKET_STORAGE_CLASS_DEEP_COLD_ARCHIVE}
# Convert the storage class of the object. 
bucket.copy_object(bucket.bucket_name, object_name, object_name, headers)

Convert the storage class of an object from Archive to Standard or IA

The following sample code converts the storage class of an object from Archive to Standard or IA: 

# -*- coding: utf-8 -*-
import oss2
from oss2.credentials import EnvironmentVariableCredentialsProvider
import os
import time
# 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. 
auth = oss2.ProviderAuthV4(EnvironmentVariableCredentialsProvider())

# Specify the endpoint of the bucket region (for example: https://oss-cn-hangzhou.aliyuncs.com). 
endpoint = "https://oss-cn-hangzhou.aliyuncs.com"

# Specify the ID of the region that maps to the endpoint. Example: cn-hangzhou. This parameter is required if you use the signature algorithm V4.
region = "cn-hangzhou"

# Specify the name of your bucket.
bucket = oss2.Bucket(auth, endpoint, "yourBucketName", region=region)

# Specify the full path of the object. Do not include the bucket name in the full path. Example: exampledir/exampleobject.txt. 
# Make sure that the storage class of the object is Archive. 
object_name = 'exampledir/exampleobject.txt'

# Obtain the object metadata. 
meta = bucket.head_object(object_name)

# Restore the object. The amount of time required to restore an object varies based on the size of the object. 
if meta.resp.headers['x-oss-storage-class'] == oss2.BUCKET_STORAGE_CLASS_ARCHIVE:
    bucket.restore_object(object_name)
    while True:
        meta = bucket.head_object(object_name)
        if meta.resp.headers['x-oss-restore'] == 'ongoing-request="true"':
            time.sleep(5)
        else:
            break

# Convert the storage class of the object to Standard by setting the x-oss-storage-class header to oss2.BUCKET_STORAGE_CLASS_STANDARD. 
headers = {'x-oss-storage-class': oss2.BUCKET_STORAGE_CLASS_STANDARD}
# Convert the storage class of the object to IA by setting the x-oss-storage-class header to oss2.BUCKET_STORAGE_CLASS_IA. 
# headers = {'x-oss-storage-class': oss2.BUCKET_STORAGE_CLASS_IA}

# Convert the storage class of the object. 
bucket.copy_object(bucket.bucket_name, object_name, object_name, headers)

Convert the storage class of an object from Cold Archive to Standard or IA

The following sample code converts the storage class of an object from Cold Archive to Standard or IA: 

# -*- coding: utf-8 -*-
import oss2
from oss2.credentials import EnvironmentVariableCredentialsProvider
import os
import time
from oss2.models import RESTORE_TIER_EXPEDITED, RestoreJobParameters

# 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. 
auth = oss2.ProviderAuthV4(EnvironmentVariableCredentialsProvider())

# Specify the endpoint of the bucket region (for example: https://oss-cn-hangzhou.aliyuncs.com). 
endpoint = "https://oss-cn-hangzhou.aliyuncs.com"

# Specify the ID of the region that maps to the endpoint. Example: cn-hangzhou. This parameter is required if you use the signature algorithm V4.
region = "cn-hangzhou"

# Specify the name of your bucket.
bucket = oss2.Bucket(auth, endpoint, "yourBucketName", region=region)

# Specify the full path of the object. Do not include the bucket name in the full path. Example: exampledir/exampleobject.txt. 
# Make sure that the storage class of the object is Cold Archive. 
object_name = 'exampledir/exampleobject.txt'

# Obtain the object metadata. 
meta = bucket.head_object(object_name)

# Restore the object. 
if meta.resp.headers['x-oss-storage-class'] == oss2.BUCKET_STORAGE_CLASS_COLD_ARCHIVE:
    # Specify the restoration priority. RESTORE_TIER_EXPEDITED specifies that the object is restored within 1 hour. 
    job_parameters = RestoreJobParameters(RESTORE_TIER_EXPEDITED)
    # Specify the duration for which the object can remain in the restored state. Unit: days.     
    restore_config = oss2.models.RestoreConfiguration(days=5, job_parameters=job_parameters)
    bucket.restore_object(object_name, input=restore_config)
    while True:
        meta = bucket.head_object(object_name)
        if meta.resp.headers['x-oss-restore'] == 'ongoing-request="true"':
            time.sleep(5)
        else:
            break
# Convert the storage class of the object to Standard by setting the x-oss-storage-class header to oss2.BUCKET_STORAGE_CLASS_STANDARD. 
headers = {'x-oss-storage-class': oss2.BUCKET_STORAGE_CLASS_STANDARD}
# Convert the storage class of the object to IA by setting the x-oss-storage-class header to oss2.BUCKET_STORAGE_CLASS_IA. 
# headers = {'x-oss-storage-class': oss2.BUCKET_STORAGE_CLASS_IA}

# Convert the storage class of the object. 
bucket.copy_object(bucket.bucket_name, object_name, object_name, headers)

References

For more information about the API operation that you can call to convert the storage class of an object, see CopyObject.

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