Xojo Plugin

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.

Xojo Plugin

Dim success As Boolean
success = 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
success = 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.
success = 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()

success = http.SetUrlVar("bucket_name","chilkat-ocean")
Dim url As String
url = "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
    System.DebugLog(http.LastErrorText)
    Return
End If

Dim responseCode As Int32
responseCode = resp.StatusCode
If (responseCode = 401) Then
    System.DebugLog(resp.BodyStr)
    System.DebugLog("If invalid credentials, then it is likely the access token expired.")
    System.DebugLog("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. 

System.DebugLog("Response code: " + Str(responseCode))
System.DebugLog("Response body")
System.DebugLog(resp.BodyStr)

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