Updated on 2024-06-21 GMT+08:00

Listing Parallel File Systems (SDK for Go)

Function

Parallel file systems (PFSs) are containers for storing objects in OBS. Files uploaded to OBS are stored as objects in PFSs. This API returns a list of all PFSs that meet the specified conditions in all regions of the current account. Returned PFSs are listed in alphabetical order by PFS name.

Restrictions

  • To list PFSs, you must have the obs:bucket:ListAllMyBuckets permission. IAM is recommended for granting permissions. For details, see IAM Custom Policies.
  • The mapping between OBS regions and endpoints must comply with what is listed in Regions and Endpoints.

Method

func (obsClient ObsClient) ListBuckets(input *ListBucketsInput) (output *ListBucketsOutput, err error)

Request Parameters

Table 1 List of request parameters

Parameter

Type

Mandatory (Yes/No)

Description

input

*ListBucketsInput

No

Explanation:

Input parameters for listing PFSs. For details, see Table 2.

Table 2 ListBucketsInput

Parameter

Type

Mandatory (Yes/No)

Description

QueryLocation

bool

No

Explanation:

Whether to query the PFS location.

Value range:

  • true: The PFS location is queried.
  • false: The PFS location is not queried.

Default value:

false

BucketType

BucketType

No

Explanation:

Type of the buckets to be listed.

Value range:

See Table 3.

Default value:

If this parameter is not specified, all buckets and parallel file systems are listed.

Table 3 BucketType

Constant

Default Value

Description

OBJECT

OBJECT

An object bucket

POSIX

POSIX

A parallel POSIX-compatible file bucket

Responses

Table 4 List of returned results

Parameter

Type

Description

output

*ListBucketsOutput

Explanation:

Returned results. For details, see Table 5.

err

error

Explanation:

Error messages returned by the API

Table 5 ListBucketsOutput

Parameter

Type

Description

StatusCode

int

Explanation:

HTTP status code

Value range:

A status code is a group of digits that can be 2xx (indicating successes) or 4xx or 5xx (indicating errors). It indicates the status of a response. For more information, see Status Code.

Default value:

None

RequestId

string

Explanation:

Request ID returned by the OBS server

Default value:

None

ResponseHeaders

map[string][]string

Explanation:

HTTP response headers

Default value:

None

Owner

Owner

Explanation:

PFS owner.

Value range:

See Table 6.

Buckets

[]Bucket

Explanation:

PFS list.

Value range:

See Table 7.

Table 6 Owner

Parameter

Type

Mandatory (Yes/No)

Description

ID

string

Yes if used as a request parameter

Explanation:

Account (domain) ID of the owner

Value range:

To obtain the account ID, see How Do I Get My Account ID and User ID?

Default value:

None

Table 7 Bucket

Parameter

Type

Description

Name

string

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 a period (.) and a hyphen (-) adjacent to each other, for example, my-.bucket or my.-bucket.

Default value:

None

CreationDate

time.Time

Explanation:

Time when the bucket was created

Default value:

None

Location

string

Explanation:

Region where a bucket is located

Restrictions:

If the used endpoint is obs.myhuaweicloud.com, this parameter is not required. If any other endpoint is used, this parameter is required.

Value range:

To learn about valid regions and endpoints, see Regions and Endpoints. An endpoint is the request address for calling an API. Endpoints vary depending on services and regions. To obtain the regions and endpoints, contact the enterprise administrator.

Default value:

If obs.myhuaweicloud.com is used as the endpoint and no region is specified, cn-north-1 (the CN North-Beijing1 region) is used by default.

BucketType

string

Explanation:

Bucket type

Value range:

  • Object bucket: OBJECT
  • Parallel file system: POSIX

Default value:

None

Code Examples

This example lists all PFSs.

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package main
import (
    "fmt"
    "os"
    obs "github.com/huaweicloud/huaweicloud-sdk-go-obs/obs"
)
func main() {
    //Obtain an AK/SK pair using environment variables or import an AK/SK pair in other ways. Using hard coding may result in leakage.
    //Obtain an AK/SK pair on the management console. For details, see https://support.huaweicloud.com/intl/en-us/usermanual-ca/ca_01_0003.html.
    ak := os.Getenv("AccessKeyID")
    sk := os.Getenv("SecretAccessKey")
    // (Optional) If you use a temporary AK/SK pair and a security token to access OBS, you are advised not to use hard coding, which may result in information leakage. You can obtain an AK/SK pair using environment variables or import an AK/SK pair in other ways.
    // securityToken := os.Getenv("SecurityToken")
    // Enter the endpoint corresponding to the region where the bucket is located. CN-Hong Kong is used here as an example. Replace it with the one currently in use.
    endPoint := "https://obs.ap-southeast-1.myhuaweicloud.com"
    // Create an obsClient instance.
    // If you use a temporary AK/SK pair and a security token to access OBS, use the obs.WithSecurityToken method to specify a security token when creating an instance.
    obsClient, err := obs.New(ak, sk, endPoint/*, obs.WithSecurityToken(securityToken)*/)
    if err != nil {
        fmt.Printf("Create obsClient error, errMsg: %s", err.Error())
    }
    input := &obs.ListBucketsInput{}
    // Specify whether to query the PFS location in the listing. The default value is false. true is used as an example.
    input.QueryLocation = true
    // Specify the type of the buckets to list. By default, all buckets and PFSs are listed. obs.POSIX is used as an example, indicating that all PFSs are listed.
    input.BucketType = obs.POSIX
    // List PFSs.
    output, err := obsClient.ListBuckets(input)
    if err == nil {
        fmt.Printf("List buckets successful!\n")
        fmt.Printf("RequestId:%s\n", output.RequestId)
        for index, val := range output.Buckets {
            fmt.Printf("Bucket[%d]-Name:%s,CreationDate:%s\n", index, val.Name, val.CreationDate)
        }
        return
    }
    fmt.Printf("List buckets fail!\n")
    if obsError, ok := err.(obs.ObsError); ok {
        fmt.Println("An ObsError was found, which means your request sent to OBS was rejected with an error response.")
        fmt.Println(obsError.Error())
    } else {
        fmt.Println("An Exception was found, which means the client encountered an internal problem when attempting to communicate with OBS, for example, the client was unable to access the network.")
        fmt.Println(err)
    }
}