(Tcl) 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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load ./chilkat.dll

# 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..
set sbToken [new_CkStringBuilder]

CkStringBuilder_LoadFile $sbToken "qa_data/tokens/googleCloudStorageAccessToken.txt" "utf-8"

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

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

set json [new_CkJsonObject]

# Be careful if using the "regional" storage class.  See the note below about the 400 error response.
CkJsonObject_UpdateString $json "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"

set http [new_CkHttp]

CkHttp_put_AuthToken $http [CkStringBuilder_getAsString $sbToken]

CkHttp_SetUrlVar $http "bucket_name" "chilkat-ocean"
set url "https://www.googleapis.com/storage/v1/b/{$bucket_name}?fields=storageClass"
# resp is a CkHttpResponse
set resp [CkHttp_PText $http "PUT" $url [CkJsonObject_emit $json] "utf-8" "application/json" 0 0]
if {[CkHttp_get_LastMethodSuccess $http] == 0} then {
    puts [CkHttp_lastErrorText $http]
    delete_CkStringBuilder $sbToken
    delete_CkJsonObject $json
    delete_CkHttp $http
    exit
}

set responseCode [CkHttpResponse_get_StatusCode $resp]
if {$responseCode == 401} then {
    puts [CkHttpResponse_bodyStr $resp]
    puts "If invalid credentials, then it is likely the access token expired."
    puts "Your app should automatically fetch a new access token and re-try."
    delete_CkHttpResponse $resp

    delete_CkStringBuilder $sbToken
    delete_CkJsonObject $json
    delete_CkHttp $http
    exit
}

# 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. 

puts "Response code: $responseCode"
puts "Response body"
puts [CkHttpResponse_bodyStr $resp]

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

delete_CkHttpResponse $resp


delete_CkStringBuilder $sbToken
delete_CkJsonObject $json
delete_CkHttp $http