Torch Object Storage
Torch Object Storage
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- Documentation
Torch Object StorageSDK ReferencePythonIntroduction to typical scenesMulti-version scenarios (Python SDK)
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Multi-version scenarios (Python SDK)
Copy pageDownload PDFMulti-version scenarios (Python SDK)
Version control applies to all objects in the bucket. By enabling version control for the bucket, you can restore objects to any previous version after accidental deletion or overwriting. Currently, multi-version support includes interfaces such as GetObject, GetObjectACL, CopyObject, UploadPartCopy, and DeleteObject. When calling these interfaces, you can specify the target object's specific version through the optional parameter version_id.
Bucket multi-version management
In TOS, a bucket's version status includes three states: disabled, versioning enabled, and versioning suspended.
warning
- To enable or suspend multi-version status for a bucket, your account must have the tos:PutBucketVersioning permission.
- To query the multi-version status of a bucket, your account must have the tos:GetBucketVersioning permission.
Set bucket version control status
The following code sets the bucket status to enable versioning or suspend version control.
import os
import tos
from tos import VersioningStatusType
# Retrieve AKSK information from environment variables.
ak = os.getenv('TOS_ACCESS_KEY')
sk = os.getenv('TOS_SECRET_KEY')
endpoint = "your endpoint"
region = "your region"
bucket_name = "bucket-test"
object_key = "object-test"
try:
# Create a TosClientV2 object to perform operations on buckets and objects.
client = tos.TosClientV2(ak, sk, endpoint, region)
# Enable bucket versioning
client.put_bucket_versioning(bucket_name, VersioningStatusType.Versioning_Status_Enabled)
# Pause bucket multi-version.
client.put_bucket_versioning(bucket_name, VersioningStatusType.Versioning_Status_Suspended)
except tos.exceptions.TosClientError as e:
# Operation failed, catch client error, usually caused by invalid request parameters or network issues
print('fail with client error, message:{}, cause: {}'.format(e.message, e.cause))
except tos.exceptions.TosServerError as e:
# Operation failed, catch server error, detailed error information can be obtained from the response
print('fail with server error, code: {}'.format(e.code))
# request id can be used to locate specific issues, it is strongly recommended to save it in the log.
print('error with request id: {}'.format(e.request_id))
print('error with message: {}'.format(e.message))
print('error with http code: {}'.format(e.status_code))
print('error with ec: {}'.format(e.ec))
print('error with request url: {}'.format(e.request_url))
except Exception as e:
print('fail with unknown error: {}'.format(e))
Get the bucket version control status
The following code retrieves the version control status of the bucket bucket-test.
import os
import tos
from tos import VersioningStatusType
# Retrieve AKSK information from environment variables.
ak = os.getenv('TOS_ACCESS_KEY')
sk = os.getenv('TOS_SECRET_KEY')
endpoint = "your endpoint"
region = "your region"
bucket_name = "bucket-test"
object_key = "object-test"
try:
# Create a TosClientV2 object to perform operations on buckets and objects.
client = tos.TosClientV2(ak, sk, endpoint, region)
# Enable bucket versioning
version_info = client.get_bucket_version(bucket_name)
print('bucket version state:', version_info.status)
except tos.exceptions.TosClientError as e:
# Operation failed, catch client error, usually caused by invalid request parameters or network issues
print('fail with client error, message:{}, cause: {}'.format(e.message, e.cause))
except tos.exceptions.TosServerError as e:
# Operation failed, catch server error, detailed error information can be obtained from the response
print('fail with server error, code: {}'.format(e.code))
# request id can be used to locate specific issues, it is strongly recommended to save it in the log.
print('error with request id: {}'.format(e.request_id))
print('error with message: {}'.format(e.message))
print('error with http code: {}'.format(e.status_code))
print('error with ec: {}'.format(e.ec))
print('error with request url: {}'.format(e.request_url))
except Exception as e:
print('fail with unknown error: {}'.format(e))
Download versioned object
The following code downloads a specified version of the object object-test from the bucket bucket-test into memory.
import os
import tos
# Retrieve AKSK information from environment variables.
ak = os.getenv('TOS_ACCESS_KEY')
sk = os.getenv('TOS_SECRET_KEY')
endpoint = "your endpoint"
region = "your region"
bucket_name = "bucket-test"
object_key = "object-test"
version_id = "your version id"
try:
# Create a TosClientV2 object to perform operations on buckets and objects.
client = tos.TosClientV2(ak, sk, endpoint, region)
# get_object returns an iterable object.
object_stream = client.get_object(bucket_name, object_key, version_id=version_id)
# Iteratively read object content.
for content in object_stream:
print(content)
except tos.exceptions.TosClientError as e:
# Operation failed, catch client error, usually caused by invalid request parameters or network issues
print('fail with client error, message:{}, cause: {}'.format(e.message, e.cause))
except tos.exceptions.TosServerError as e:
# Operation failed, catch server error, detailed error information can be obtained from the response
print('fail with server error, code: {}'.format(e.code))
# request id can be used to locate specific issues, it is strongly recommended to save it in the log.
print('error with request id: {}'.format(e.request_id))
print('error with message: {}'.format(e.message))
print('error with http code: {}'.format(e.status_code))
print('error with ec: {}'.format(e.ec))
print('error with request url: {}'.format(e.request_url))
except Exception as e:
print('fail with unknown error: {}'.format(e))
Delete versioned object
The following code deletes a specified version of the object object-test in the specified bucket bucket-test.
import os
import tos
# Retrieve AKSK information from environment variables.
ak = os.getenv('TOS_ACCESS_KEY')
sk = os.getenv('TOS_SECRET_KEY')
endpoint = "your endpoint"
region = "your region"
bucket_name = "bucket-test"
object_key = "object-test"
version_id = "your version id"
try:
# Create a TosClientV2 object to perform operations on buckets and objects.
client = tos.TosClientV2(ak, sk, endpoint, region)
# Delete specified objects under a specified bucket.
resp = client.delete_object(bucket_name, object_key, version_id=version_id)
except tos.exceptions.TosClientError as e:
# Operation failed, catch client error, usually caused by invalid request parameters or network issues
print('fail with client error, message:{}, cause: {}'.format(e.message, e.cause))
except tos.exceptions.TosServerError as e:
# Operation failed, catch server error, detailed error information can be obtained from the response
print('fail with server error, code: {}'.format(e.code))
# request id can be used to locate specific issues, it is strongly recommended to save it in the log.
print('error with request id: {}'.format(e.request_id))
print('error with message: {}'.format(e.message))
print('error with http code: {}'.format(e.status_code))
print('error with ec: {}'.format(e.ec))
print('error with request url: {}'.format(e.request_url))
except Exception as e:
print('fail with unknown error: {}'.format(e))
Empty a bucket with versioning enabled
The following code example empties an entire bucket with versioning enabled, including deleting multiple versions of objects, delete marker objects, and all uncommitted objects.
import os
import tos
# Retrieve AKSK information from environment variables.
ak = os.getenv('TOS_ACCESS_KEY')
sk = os.getenv('TOS_SECRET_KEY')
endpoint = "your endpoint"
region = "your region"
bucket_name = "bucket-test"
try:
# Create a TosClientV2 object to perform operations on buckets and objects.
client = tos.TosClientV2(ak, sk, endpoint, region)
# Delete all versions of all objects, delete all versions with deletion markers.
is_truncated = True
key_marker = ''
version_id_marker = ''
while is_truncated:
out = client.list_object_versions(bucket_name, key_marker=key_marker, version_id_marker=version_id_marker)
# The version contains information about multiple versions of objects.
for version in out.versions:
client.delete_object(bucket_name, version.key, version.version_id)
# Delete tag information.
for delete_marker in out.delete_markers:
client.delete_object(bucket_name, delete_marker.key, delete_marker.version_id)
is_truncated = out.is_truncated
key_marker = out.next_key_marker
version_id_marker = out.next_version_id_marker
# Delete all unmerged objects.
is_truncated = True
marker = ''
while is_truncated:
out = client.list_multipart_uploads(bucket_name, key_marker=marker)
for upload in out.uploads:
client.abort_multipart_upload(bucket_name, upload.key, upload.upload_id)
is_truncated = out.is_truncated
marker = out.next_key_marker
except tos.exceptions.TosClientError as e:
# Operation failed, catch client error, usually caused by invalid request parameters or network issues
print('fail with client error, message:{}, cause: {}'.format(e.message, e.cause))
except tos.exceptions.TosServerError as e:
# Operation failed, catch server error, detailed error information can be obtained from the response
print('fail with server error, code: {}'.format(e.code))
# request id can be used to locate specific issues, it is strongly recommended to save it in the log.
print('error with request id: {}'.format(e.request_id))
print('error with message: {}'.format(e.message))
print('error with http code: {}'.format(e.status_code))
print('error with ec: {}'.format(e.ec))
print('error with request url: {}'.format(e.request_url))
except Exception as e:
print('fail with unknown error: {}'.format(e))
Last updated: 2025.09.17 18:22:10
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