Configuring Lifecycle Rules for a Bucket (SDK for Python)

Function

You can configure lifecycle rules to periodically delete objects or transition objects between storage classes. For more information, see Lifecycle Management.

This API configures lifecycle rules for a bucket.

Expired objects will be permanently deleted and cannot be recovered.
Multi-AZ redundancy is not available for Archive storage. For this reason, buckets or objects with multi-AZ redundancy cannot be transitioned to the Archive storage class based on a lifecycle rule.
The minimum storage duration is 30 days for Infrequent Access storage, and 90 days for Archive storage. After an object is transitioned to the Archive storage class, if it stays in this storage class for less than 90 days, you still need to pay for a full 90 days.

Restrictions

There is no limit on the number of lifecycle rules in a bucket, but the total size of XML descriptions about all lifecycle rules in a bucket cannot exceed 20 KB.
A maximum of 20 lifecycle rules can be configured for a parallel file system.
To configure a lifecycle rule for a bucket, you must be the bucket owner or have the required permission (obs:bucket:PutLifecycleConfiguration in IAM or PutLifecycleConfiguration in a bucket policy). For details, see Introduction to OBS Access Control, IAM Custom Policies, and Creating a Custom Bucket Policy.

Method

ObsClient.setBucketLifecycle(bucketName, lifecycle)

Request Parameters

Parameter	Type	Mandatory (Yes/No)	Description
bucketName	str	Yes	Explanation: Bucket name Restrictions: A bucket name must be unique across all accounts and regions. A bucket name: Must be 3 to 63 characters long and start with a digit or letter. Lowercase letters, digits, hyphens (-), and periods (.) are allowed. Cannot be formatted as an IP address. Cannot start or end with a hyphen (-) or period (.). Cannot contain two consecutive periods (..), for example, my..bucket. Cannot contain periods (.) and hyphens (-) adjacent to each other, for example, my-.bucket or my.-bucket. If you repeatedly create buckets of the same name in the same region, no error will be reported and the bucket properties comply with those set in the first creation request. Default value: None
lifecycle	Lifecycle	Yes	Explanation: List of lifecycle rules. For details, see Table 1. Default value: None

Parameter

Type

Mandatory (Yes/No)

Description

bucketName

str

Yes

Explanation:

Bucket name

Restrictions:

A bucket name must be unique across all accounts and regions.
A bucket name:
- Must be 3 to 63 characters long and start with a digit or letter. Lowercase letters, digits, hyphens (-), and periods (.) are allowed.
- Cannot be formatted as an IP address.
- Cannot start or end with a hyphen (-) or period (.).
- Cannot contain two consecutive periods (..), for example, my..bucket.
- Cannot contain periods (.) and hyphens (-) adjacent to each other, for example, my-.bucket or my.-bucket.
If you repeatedly create buckets of the same name in the same region, no error will be reported and the bucket properties comply with those set in the first creation request.

Default value:

None

lifecycle

Lifecycle

Yes

Explanation:

List of lifecycle rules. For details, see Table 1.

Default value:

None

**Table 1** Lifecycle
Parameter	Type	Mandatory (Yes/No)	Description
rule	list of Rule	Yes	Explanation: List of lifecycle rules. For details, see Table 2. Default value: None

**Table 2** Rule
Parameter	Type	Mandatory (Yes/No)	Description
id	str	No	Explanation: Lifecycle rule ID Value range: The value must contain 1 to 255 characters. Default value: None
prefix	str	Yes	Explanation: Object name prefix. It identifies the objects the rule applies to. You can leave this parameter blank to apply the rule to all objects in the bucket. Assume that you have the following objects: logs/day1, logs/day2, logs/day3, and ExampleObject.jpg. If you set Prefix to ExampleObject.jpg, the rule applies to object ExampleObject.jpg only. If you set Prefix to logs/, the rule applies to the three objects with name starting with logs/. If you leave Prefix blank, the rule applies to all objects in the bucket. Value range: The value must contain 1 to 1,024 characters. Default value: None
status	str	Yes	Explanation: Whether the rule is enabled Value range: Enabled Disabled Default value: None
transition	Transition or list of Transition	No	Explanation: Policies for storage class transition, including transition time and the storage class after transition. For details, see Table 3. Restrictions: This parameter applies only to the current object version. Default value: None
expiration	Expiration	No	Explanation: Object expiration time. For details, see Table 4. Restrictions: This parameter applies only to the current object version. Default value: None
noncurrentVersionTransition	NoncurrentVersionTransition or list of NoncurrentVersionTransition	No	Explanation: Policies for storage class transition, including transition time and the storage class after transition. For details, see Table 7. Restrictions: This parameter applies only to noncurrent object versions. Versioning is enabled (or suspended after being enabled) for the bucket. This parameter is not available for parallel file systems. Default value: None
noncurrentVersionExpiration	NoncurrentVersionExpiration	No	Explanation: Expiration time of noncurrent object versions. For details, see Table 8. Restrictions: This parameter applies only to noncurrent object versions. Versioning is enabled (or suspended after being enabled) for the bucket. CAUTION: This parameter is not available for parallel file systems. Default value: None

**Table 3** Transition
Parameter	Type	Mandatory (Yes/No)	Description
storageClass	str	Yes if used as a request parameter	Explanation: Storage class of the object after transition Restrictions: The Standard storage class is not supported. Restrictions on storage class transitions: Only transitions from the Standard storage class to the Infrequent Access storage class are supported. To transition objects from Infrequent Access to Standard, you must manually do it. Only transitions from the Standard or Infrequent Access storage class to the Archive storage class are supported. To transition objects from Archive to Standard or Infrequent Access, you must restore the objects first and then manually transition their storage class. Multi-AZ redundancy is not available for Archive storage. For this reason, buckets or objects with multi-AZ redundancy cannot be transitioned to the Archive storage class based on a lifecycle rule. Value range: See Table 5. Default value: None
date	str or DateTime	Yes if the parameter is used as a request parameter and days is absent	Explanation: OBS executes the lifecycle rule for objects that were modified before the specified date. Restrictions: The value must conform with the ISO8601 standards and must be at 00:00 (UTC time). For example, 2018-01-01T00:00:00.000Z, indicating only objects that were last modified before that time are transitioned to the specified storage class. For example, DateTime(year=2023, month=9, day=12) Default value: None
days	int	Yes if the parameter is used as a request parameter and date is absent	Explanation: Number of days (since the last update was made to the object) after which the lifecycle rule takes effect Restrictions: This parameter applies only to the current object version. Value range: An integer greater than or equal to 0, in days Default value: None

**Table 4** Expiration
Parameter	Type	Mandatory (Yes/No)	Description
date	str or DateTime	Yes if the parameter is used as a request parameter and days is absent	Explanation: OBS executes the lifecycle rule for objects that were modified before the specified date. Restrictions: The value must conform with the ISO8601 standards and must be at 00:00 (UTC time). For example, 2018-01-01T00:00:00.000Z, indicating only objects that were last modified before that time are deleted. For example, DateTime(year=2023, month=9, day=12) Default value: None
days	int	Yes if the parameter is used as a request parameter and date is absent	Explanation: Number of days (since the last update was made to the object) after which the lifecycle rule takes effect Restrictions: This parameter applies only to the current object version. Value range: An integer greater than or equal to 0, in days Default value: None

**Table 5** StorageClass
Parameter	Type	Description
STANDARD	Standard storage class	Explanation: Features low access latency and high throughput and is used for storing massive, frequently accessed (multiple times a month) or small objects (< 1 MB) requiring quick response.
WARM	Infrequent Access storage class	Explanation: Used for storing data that is semi-frequently accessed (fewer than 12 times a year) but is instantly available when needed.
COLD	Archive storage class	Explanation: Used for storing rarely accessed (once a year) data.

**Table 6** DateTime
Parameter	Type	Description
year	int	Explanation: Year in UTC Default value: None
month	int	Explanation: Month in UTC Default value: None
day	int	Explanation: Day in UTC Default value: None
hour	int	Explanation: Hour in UTC Restrictions: The value is in 24-hour format. Default value: 0
min	int	Explanation: Minute in UTC Default value: 0
sec	int	Explanation: Second in UTC Default value: 0

**Table 7** NoncurrentVersionTransition
Parameter	Type	Mandatory (Yes/No)	Description
storageClass	str	Yes if used as a request parameter	Explanation: Storage class of noncurrent object versions after transition Restrictions: The Standard storage class is not supported. Restrictions on storage class transitions: Only transitions from the Standard storage class to the Infrequent Access storage class are supported. To transition objects from Infrequent Access to Standard, you must manually do it. Only transitions from the Standard or Infrequent Access storage class to the Archive storage class are supported. To transition objects from Archive to Standard or Infrequent Access, you must restore the objects first and then manually transition their storage class. Multi-AZ redundancy is not available for Archive storage. For this reason, buckets or objects with multi-AZ redundancy cannot be transitioned to the Archive storage class based on a lifecycle rule. Value range: See Table 5. Default value: None
noncurrentDays	int	Yes if used as a request parameter	Explanation: Number of days an object is noncurrent before the specified rule takes effect Restrictions: This parameter applies only to noncurrent object versions. Value range: An integer greater than or equal to 0, in days Default value: None

**Table 8** NoncurrentVersionExpiration
Parameter	Type	Mandatory (Yes/No)	Description
noncurrentDays	int	Yes if used as a request parameter	Explanation: Number of days an object is noncurrent before the specified rule takes effect Restrictions: This parameter applies only to noncurrent object versions. Value range: An integer greater than or equal to 0, in days Default value: None

Responses

Type	Description
GetResult	Explanation: SDK common results

Type

Description

GetResult

Explanation:

SDK common results

**Table 9** GetResult
Parameter	Type	Description
status	int	Explanation: HTTP status code Value range: A status code is a group of digits ranging from 2xx (indicating successes) to 4xx or 5xx (indicating errors). It indicates the status of a response. For more information, see Status Code. Default value: None
reason	str	Explanation: Reason description. Default value: None
errorCode	str	Explanation: Error code returned by the OBS server. If the value of status is less than 300, this parameter is left blank. Default value: None
errorMessage	str	Explanation: Error message returned by the OBS server. If the value of status is less than 300, this parameter is left blank. Default value: None
requestId	str	Explanation: Request ID returned by the OBS server Default value: None
indicator	str	Explanation: Error indicator returned by the OBS server. Default value: None
hostId	str	Explanation: Requested server ID. If the value of status is less than 300, this parameter is left blank. Default value: None
resource	str	Explanation: Error source (a bucket or an object). If the value of status is less than 300, this parameter is left blank. Default value: None
header	list	Explanation: Response header list, composed of tuples. Each tuple consists of two elements, respectively corresponding to the key and value of a response header. Default value: None
body	object	Explanation: Result content returned after the operation is successful. If the value of status is larger than 300, this parameter is left blank. The value varies with the API being called. For details, see Bucket-Related APIs (SDK for Python) and Object-Related APIs (SDK for Python). Default value: None

Code Examples

This example configures a lifecycle rule for bucket examplebucket.

    
     
       
       
         from obs import ObsClient
from obs import Expiration, NoncurrentVersionExpiration
from obs import DateTime
from obs import Rule
from obs import Lifecycle
import os
import traceback

# Obtain an AK and SK pair using environment variables or import the AK and SK pair in other ways. Using hard coding may result in leakage.
# Obtain an AK and SK pair on the management console. For details, see https://support.huaweicloud.com/eu/usermanual-ca/ca_01_0003.html.
ak = os.getenv("AccessKeyID")
sk = os.getenv("SecretAccessKey")
# (Optional) If you use a temporary AK and SK pair and a security token to access OBS, obtain them from environment variables.
security_token = os.getenv("SecurityToken")
# Set server to the endpoint corresponding to the bucket. Here uses EU-Dublin as an example. Replace it with the one in use.
server = "https://obs.eu-west-101.myhuaweicloud.eu" 

# Create an obsClient instance.
# If you use a temporary AK and SK pair and a security token to access OBS, you must specify security_token when creating an instance.
obsClient = ObsClient(access_key_id=ak, secret_access_key=sk, server=server)
try:
    # Configure a lifecycle rule for deleting objects with prefix1 as the prefix after 60 days since the last update.
    rule1 = Rule(id='rule1', prefix='prefix1', status='Enabled', expiration=Expiration(days=60))
    # Configure a lifecycle rule for deleting objects with prefix2 as the prefix on December 31, 2023.
    rule2 = Rule(id='rule2', prefix='prefix2', status='Enabled', expiration=Expiration(date=DateTime(2023, 12, 31)))
    lifecycle = Lifecycle(rule=[rule1, rule2])
    bucketName="examplebucket"
    # Configures the lifecycle rules for the bucket.
    resp = obsClient.setBucketLifecycle(bucketName, lifecycle)
    # If status code 2xx is returned, the API is called successfully. Otherwise, the API call fails.
    if resp.status < 300:
        print('Set Bucket Lifecycle Succeeded')
        print('requestId:', resp.requestId)
    else:
        print('Set Bucket Lifecycle Failed')
        print('requestId:', resp.requestId)
        print('errorCode:', resp.errorCode)
        print('errorMessage:', resp.errorMessage)
except:
    print('Set Bucket Lifecycle Failed')
    print(traceback.format_exc())

        

      

    
   