(Go) 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.

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    // 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..
    sbToken := chilkat.NewStringBuilder()
    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]"
    // }
    // 

    json := chilkat.NewJsonObject()
    // 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"

    http := chilkat.NewHttp()
    http.SetAuthToken(*sbToken.GetAsString())

    http.SetUrlVar("bucket_name","chilkat-ocean")
    url := "https://www.googleapis.com/storage/v1/b/{$bucket_name}?fields=storageClass"
    resp := http.PText("PUT",url,*json.Emit(),"utf-8","application/json",false,false)
    if http.LastMethodSuccess() == false {
        fmt.Println(http.LastErrorText())
        sbToken.DisposeStringBuilder()
        json.DisposeJsonObject()
        http.DisposeHttp()
        return
    }

    responseCode := resp.StatusCode()
    if responseCode == 401 {
        fmt.Println(resp.BodyStr())
        fmt.Println("If invalid credentials, then it is likely the access token expired.")
        fmt.Println("Your app should automatically fetch a new access token and re-try.")
        resp.DisposeHttpResponse()
        sbToken.DisposeStringBuilder()
        json.DisposeJsonObject()
        http.DisposeHttp()
        return
    }

    // 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. 

    fmt.Println("Response code: ", responseCode)
    fmt.Println("Response body")
    fmt.Println(resp.BodyStr())

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

    resp.DisposeHttpResponse()

    sbToken.DisposeStringBuilder()
    json.DisposeJsonObject()
    http.DisposeHttp()