VB.NET

Manage Bucket Storage Class

See more Google Cloud Storage Examples

Demonstrates how to manage a bucket's default storage class.

See Cloud Storage Classes for information about storage classes.

VB.NET

Dim success As Boolean = False

' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

' This example uses a previously obtained access token having permission for the 
' scope "https://www.googleapis.com/auth/cloud-platform"

' In this example, Get Google Cloud Storage OAuth2 Access Token, 
' the service account access token was saved to a text file.  This example fetches the access token from the file..
Dim sbToken As New Chilkat.StringBuilder
sbToken.LoadFile("qa_data/tokens/googleCloudStorageAccessToken.txt","utf-8")

' ---- Step 1
' Create the JSON body of the PUT request that will be sent.

' {
'   "storageClass": "[STORAGE_CLASS]"
' }
' 

Dim json As New Chilkat.JsonObject
' Be careful if using the "regional" storage class.  See the note below about the 400 error response.
json.UpdateString("storageClass","nearline")

' ---- Step 2
' Send a PUT equivalent to this curl command

' curl -X PUT --data-binary @[JSON_FILE_NAME].json \
'     -H "Authorization: Bearer [OAUTH2_TOKEN]" \
'     -H "Content-Type: application/json" \
'     "https://www.googleapis.com/storage/v1/b/[BUCKET_NAME]?fields=storageClass"

Dim http As New Chilkat.Http
http.AuthToken = sbToken.GetAsString()

http.SetUrlVar("bucket_name","chilkat-ocean")
Dim url As String = "https://www.googleapis.com/storage/v1/b/{$bucket_name}?fields=storageClass"
Dim resp As New Chilkat.HttpResponse
success = http.HttpJson("PUT",url,json,"application/json",resp)
If (success = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


Dim responseCode As Integer = resp.StatusCode
If (responseCode = 401) Then
    Debug.WriteLine(resp.BodyStr)
    Debug.WriteLine("If invalid credentials, then it is likely the access token expired.")
    Debug.WriteLine("Your app should automatically fetch a new access token and re-try.")
    Exit Sub
End If


' On my first try at running this code, I received the following error response:
' Response code: 400
' Response body
' {
'  "error": {
'   "errors": [
'    {
'     "domain": "global",
'     "reason": "invalid",
'     "message": "The combination of locationConstraint and storageClass you provided is not supported for your project"
'    }
'   ],
'   "code": 400,
'   "message": "The combination of locationConstraint and storageClass you provided is not supported for your project"
'  }
' }
' 

' This was because my storage location was a Multi-regional location, and I tried to assign the "regional" storage class,
' which is not allowed. 

Debug.WriteLine("Response code: " & responseCode)
Debug.WriteLine("Response body")
Debug.WriteLine(resp.BodyStr)

' A response code = 200 indicates success, and the response body contains the JSON
' 
' Response code: 200
' Response body
' {
'  "storageClass": "NEARLINE"
' }
'