B4X

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.

B4X

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 ChilkatStringBuilder
sbToken.Initialize
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 ChilkatJsonObject
json.Initialize
'  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 ChilkatHttp
http.Initialize("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 ChilkatHttpResponse
resp.Initialize
success = http.HttpJson("PUT", url, json, "application/json", resp)
If success = False Then
    Log(http.LastErrorText)
    Return
End If


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

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

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