Torch Object Storage
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- Documentation
Torch Object StorageSDK ReferencePythonObject interfaceList objectsList unmerged objects (list multipart upload tasks) - Python SDK
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List unmerged objects (list multipart upload tasks) - Python SDK
Copy pageDownload PDFList unmerged objects (list multipart upload tasks) - Python SDK
This API is used to list multiversion objects in a bucket. This API returns a maximum of 1,000 multiversion objects in the bucket for each request. You can use request parameters to define the selection criteria for the objects to list.
Notes
To list multipart upload tasks, you need tos:ListBucketMultipartUploads permission on the bucket. For details, see IAM policy overview.
Parameter description
Parameter | Description |
Parameter | Description |
prefix | Prefix for this query result. |
delimiter | The character used to group object names. |
max_uploads | Returns the maximum number of objects listed, default is 1000. Values: greater than 0 and less than or equal to 1000. |
key_marker | Starting position for listing versioned objects. Objects are listed in alphabetical order after the specified start. Usually the next_marker value returned from the last request. |
Example code
Simply list unmerged multipart upload tasks
The following code lists up to 10 unmerged multipart upload tasks 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'
try:
# Fill in "your endpoint" and "your region" with the corresponding Endpoint of the region where your Bucket is located. Taking the example of North China 2 (Beijing), fill in "your endpoint" with tos-cn-beijing.volces.com and "your region" with cn-beijing.
client = tos.TosClientV2(ak, sk, endpoint, region)
out = client.list_multipart_uploads(bucket_name, max_uploads=10)
for upload in out.uploads:
print('object key', upload.key)
print('upload id', upload.upload_id)
print('owner', upload.owner)
print('storage class', upload.storage_class)
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))
List all unmerged multipart upload tasks with the specified prefix
The following code lists all unmerged multipart upload tasks under the prefix exampledir/ in 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'
prefix = 'exampledir/'
try:
# Fill in "your endpoint" and "your region" with the corresponding Endpoint of the region where your Bucket is located. Taking the example of North China 2 (Beijing), fill in "your endpoint" with tos-cn-beijing.volces.com and "your region" with cn-beijing.
client = tos.TosClientV2(ak, sk, endpoint, region)
is_truncated = True
marker = ''
while is_truncated:
out = client.list_multipart_uploads(bucket_name, prefix=prefix, key_marker=marker)
for upload in out.uploads:
print('object key', upload.key)
print('upload id', upload.upload_id)
print('owner', upload.owner)
print('storage class', upload.storage_class)
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))
List all unmerged multipart upload tasks
The following code lists all unmerged multipart upload tasks in 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'
try:
# Fill in "your endpoint" and "your region" with the corresponding Endpoint of the region where your Bucket is located. Taking the example of North China 2 (Beijing), fill in "your endpoint" with tos-cn-beijing.volces.com and "your region" with cn-beijing.
client = tos.TosClientV2(ak, sk, endpoint, region)
is_truncated = True
marker = ''
while is_truncated:
out = client.list_multipart_uploads(bucket_name, key_marker=marker)
for upload in out.uploads:
print('object key', upload.key)
print('upload id', upload.upload_id)
print('owner', upload.owner)
print('storage class', upload.storage_class)
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))
Recursively list unmerged multipart upload tasks by directory
TOS only has the concept of objects. You can simulate directory functionality by creating an object that is 0 bytes and ends with a slash/.
The directory function can be simulated using the parameters delimiter and prefix:
- First set delimiter to/Then set prefix to empty to return objects and subdirectory information in the root directory.
- Set delimiter to/Set the prefix as a subdirectory to return objects and subdirectories within that subdirectory.
The following code lists unmerged multipart upload tasks in the bucket bucket-test by directory.
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'
prefix = 'exampledir/'
try:
# Fill in "your endpoint" and "your region" with the corresponding Endpoint of the region where your Bucket is located. Taking the example of North China 2 (Beijing), fill in "your endpoint" with tos-cn-beijing.volces.com and "your region" with cn-beijing.
client = tos.TosClientV2(ak, sk, endpoint, region)
is_truncated = True
marker = ''
while is_truncated:
out = client.list_multipart_uploads(bucket_name, key_marker=marker, delimiter='/', prefix=prefix)
for prefix in out.common_prefixes:
print('subDir', prefix)
for upload in out.uploads:
print('object key', upload.key)
print('upload id', upload.upload_id)
print('owner', upload.owner)
print('storage class', upload.storage_class)
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 18:22:11
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