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多版本场景（Python SDK）

最近更新时间：2024.02.04 18:31:03

首次发布时间：2023.01.19 18:21:16

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版本控制应用于桶中所有对象。通过开启桶的版本控制，您可以在错误删除或者覆盖对象后，将对象回恢复至任意的历史版本。目前支持多版本的接口包含 GetObject、GetObjectACL、CopyObject、UploadPartCopy、DeleteObject等。调用相关接口时，您可通过可选参数 version_id 指定操作对象的具体版本。

桶多版本管理

TOS中桶的版本状态包含未开启、开启版本控制和暂停版本控制三种。

注意

  • 要开启或暂停桶的多版本状态，您的账号必须具备 tos:PutBucketVersioning 权限。
  • 要查询桶的多版本状态，您的账号必须具备 tos:GetBucketVersioning 权限。

设置桶版本控制状态

以下代码用于设置桶状态为开启多版本（Enable）状态或暂停版本控制状态（Suspended）。

import os
import tos
from tos import VersioningStatusType

# 从环境变量获取 AK 和 SK 信息。
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:
    # 创建 TosClientV2 对象，对桶和对象的操作都通过 TosClientV2 实现
    client = tos.TosClientV2(ak, sk, endpoint, region)
    # 开启桶多版本
    client.put_bucket_versioning(bucket_name, VersioningStatusType.Versioning_Status_Enabled)
    # 暂停桶多版本
    client.put_bucket_versioning(bucket_name, VersioningStatusType.Versioning_Status_Suspended)
except tos.exceptions.TosClientError as e:
    # 操作失败，捕获客户端异常，一般情况为非法请求参数或网络异常
    print('fail with client error, message:{}, cause: {}'.format(e.message, e.cause))
except tos.exceptions.TosServerError as e:
    # 操作失败，捕获服务端异常，可从返回信息中获取详细错误信息
    print('fail with server error, code: {}'.format(e.code))
    # request id 可定位具体问题，强烈建议日志中保存
    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))

获取桶的版本控制状态

以下代码用于获取桶 bucket-test 的版本控制状态信息。

import os
import tos
from tos import VersioningStatusType

# 从环境变量获取 AK 和 SK 信息。
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:
    # 创建 TosClientV2 对象，对桶和对象的操作都通过 TosClientV2 实现
    client = tos.TosClientV2(ak, sk, endpoint, region)
    # 开启桶多版本
    version_info = client.get_bucket_version(bucket_name)
    print('bucket version state:', version_info.status)
except tos.exceptions.TosClientError as e:
    # 操作失败，捕获客户端异常，一般情况为非法请求参数或网络异常
    print('fail with client error, message:{}, cause: {}'.format(e.message, e.cause))
except tos.exceptions.TosServerError as e:
    # 操作失败，捕获服务端异常，可从返回信息中获取详细错误信息
    print('fail with server error, code: {}'.format(e.code))
    # request id 可定位具体问题，强烈建议日志中保存
    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))

下载多版本对象

以下代码用于下载桶 bucket-test 中的对象 object-test 的指定版本到内存。

import os
import tos

# 从环境变量获取 AK 和 SK 信息。
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:
    # 创建 TosClientV2 对象，对桶和对象的操作都通过 TosClientV2 实现
    client = tos.TosClientV2(ak, sk, endpoint, region)

    # get_object返回的是一个可迭代对象
    object_stream = client.get_object(bucket_name, object_key, version_id=version_id)
    # 迭代读取对象内容
    for content in object_stream:
        print(content)
except tos.exceptions.TosClientError as e:
    # 操作失败，捕获客户端异常，一般情况为非法请求参数或网络异常
    print('fail with client error, message:{}, cause: {}'.format(e.message, e.cause))
except tos.exceptions.TosServerError as e:
    # 操作失败，捕获服务端异常，可从返回信息中获取详细错误信息
    print('fail with server error, code: {}'.format(e.code))
    # request id 可定位具体问题，强烈建议日志中保存
    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))

删除多版本对象

以下代码用于删除指定桶 bucket-test 中的 object-test 对象的指定版本。

import os
import tos

# 从环境变量获取 AK 和 SK 信息。
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:
    # 创建 TosClientV2 对象，对桶和对象的操作都通过 TosClientV2 实现
    client = tos.TosClientV2(ak, sk, endpoint, region)
    # 删除指定桶下的指定对象
    resp = client.delete_object(bucket_name, object_key, version_id=version_id)
except tos.exceptions.TosClientError as e:
    # 操作失败，捕获客户端异常，一般情况为非法请求参数或网络异常
    print('fail with client error, message:{}, cause: {}'.format(e.message, e.cause))
except tos.exceptions.TosServerError as e:
    # 操作失败，捕获服务端异常，可从返回信息中获取详细错误信息
    print('fail with server error, code: {}'.format(e.code))
    # request id 可定位具体问题，强烈建议日志中保存
    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))

清空开启多版本的桶

以下代码用于清空整个开启多版本桶的示例代码，包括删除对象的多个版本数据、删除删除标记对象数据、删除所有未合并的对象。

import os
import tos

# 从环境变量获取 AK 和 SK 信息。
ak = os.getenv('TOS_ACCESS_KEY')
sk = os.getenv('TOS_SECRET_KEY')
endpoint = "your endpoint"
region = "your region"
bucket_name = "bucket-test"
try:
    # 创建 TosClientV2 对象，对桶和对象的操作都通过 TosClientV2 实现
    client = tos.TosClientV2(ak, sk, endpoint, region)

    # 删除所有对象的所有版本、删除删除标记的所有版本
    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)
        # version 中包含多版本对象信息
        for version in out.versions:
            client.delete_object(bucket_name, version.key, version.version_id)
        # 删除标记信息
        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

    # 删除所有未合并的对象
    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:
    # 操作失败，捕获客户端异常，一般情况为非法请求参数或网络异常
    print('fail with client error, message:{}, cause: {}'.format(e.message, e.cause))
except tos.exceptions.TosServerError as e:
    # 操作失败，捕获服务端异常，可从返回信息中获取详细错误信息
    print('fail with server error, code: {}'.format(e.code))
    # request id 可定位具体问题，强烈建议日志中保存
    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))