Obtaining Storage Information of a Bucket

Functions

This operation queries the number of bucket objects and the space occupied by the objects. The size of the object space is a positive integer, measured by bytes.

Constraints

• OBS measures bucket storage statistics in the background and does not update the storage information in real time. So, you are advised not to perform real-time verification on the storage information.

Authorization Information

To call this API, you must be the bucket owner or have the permission to obtain the storage information of a bucket. You are advised to use IAM or bucket policies for authorization. For details about OBS authorization methods, see Differences Between OBS Permissions Control Methods.

• If you use IAM for authorization, you need to use either role/policy-based authorization or identity policy-based authorization and configure the required permissions:
  • If you use role/policy-based authorization (IAM v3 APIs in the old IAM version), you need to grant the obs:bucket:GetBucketStorage permission. For details, see Creating a Custom IAM Policy.
  • If you use identity policy-based authorization (IAM v5 APIs in the new IAM version), you need to grant the obs:bucket:getBucketStorage permission, as shown in the following table. For details, see Creating a Custom IAM Identity Policy.

    Action	Access Level	Resource Type (*: Required)	Condition Key	Alias	Dependencies
    obs:bucket:getBucketStorage	Read	bucket *	g:EnterpriseProjectId g:ResourceTag/<tag-key>	-	-
    		-	obs:EpochTime obs:SourceIp obs:TlsVersion obs:CustomDomain

• If you use bucket policies for authorization, you need to grant the obs:bucket:GetBucketStorage permission. For details, see Creating a Custom Bucket Policy.

Request Syntax

The following is an example request. Replace BucketName with your bucket name and RegionID with the ID of the region where your bucket resides. You can obtain the region ID by referring to Supported Regions.

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GET /?storageinfo HTTP/1.1 
Host: BucketName.obs.RegionID.myhuaweicloud.com 
Date: GMT Date
Authorization: SignatureValue

URI Parameters

This request contains no URI parameters.

Request Headers

This request uses common headers. For details, see Table 3.

Request Body

This request contains no request body parameters.

Response Syntax

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HTTP/1.1 status_code
Date: date
Content-Type: type
Content-Length: length
<?xml version="1.0" encoding="UTF-8" standalone="yes"?> 
<GetBucketStorageInfoResult xmlns="http://obs.region.myhuaweicloud.com/doc/2015-06-30/">
<Size>size</Size> 
<ObjectNumber>number</ObjectNumber> 
</GetBucketStorageInfoResult>

Response Headers

This response uses common headers. For details, see Table 1.

Response Body

This response contains elements of information about the used storage capacity of a bucket. Table 1 describes the elements.

Error Responses

No special error responses are returned. For details about error responses, see Table 2.

Sample Request

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GET /?storageinfo HTTP/1.1
User-Agent: curl/7.29.0
Host: examplebucket.obs.region.myhuaweicloud.com
Accept: */*
Date: WED, 01 Jul 2015 03:31:18 GMT
Authorization: OBS H4IPJX0TQTHTHEBQQCEC:bLcdeJGYWw/eEEjMhPZx2MK5R9U=

Sample Response

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HTTP/1.1 200 OK
Server: OBS
x-obs-request-id: BF260000016435DD2958BFDCDB86B55E
x-obs-id-2: 32AAAQAAEAABAAAQAAEAABAAAQAAEAABCSitZctaPYVnat49fVMd1O+OWIP1yrg3
Content-Type: application/xml
WED, 01 Jul 2015 03:31:18 GMT
Content-Length: 206

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<GetBucketStorageInfoResult xmlns="http://obs.ap-southeast-1.myhuaweicloud.com/doc/2015-06-30/">
  <Size>25490</Size>
  <ObjectNumber>24</ObjectNumber>
</GetBucketStorageInfoResult>

Using SDKs to Call APIs

You are advised to use OBS SDKs to call APIs. SDKs encapsulate APIs to simplify development. You can call SDK API functions to access OBS without manually calculating signatures.

References

• For more information about bucket usage statistics, see Viewing Bucket Usage Statistics.
• For details about the billing items involved in API operations, see Billing Items.