Visual FoxPro

Azure Storage: Lease Container

See more Azure Cloud Storage Examples

Azure Storage Blob Service REST API: Sample code to establishes a lock on a container for delete operations. The lock duration can be 15 to 60 seconds, or can be infinite. Visual FoxPro

LOCAL lnSuccess
LOCAL loRest
LOCAL lnBTls
LOCAL lnPort
LOCAL lnBAutoReconnect
LOCAL loAzAuth
LOCAL loCrypt
LOCAL lcGuid
LOCAL lcResponseStr

lnSuccess = 0

* Azure Blob Service Example: Lease Container
* See also: https://msdn.microsoft.com/en-us/library/azure/jj159103.aspx

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

loRest = CreateObject('Chilkat.Rest')

* Connect to the Azure Storage Blob Service
lnBTls = 1
lnPort = 443
lnBAutoReconnect = 1
* In this example, the storage account name is "chilkat".
lnSuccess = loRest.Connect("chilkat.blob.core.windows.net",lnPort,lnBTls,lnBAutoReconnect)
IF (lnSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    CANCEL
ENDIF

* Provide Azure Cloud credentials for the REST call.
loAzAuth = CreateObject('Chilkat.AuthAzureStorage')
loAzAuth.AccessKey = "AZURE_ACCESS_KEY"
* The account name used here should match the 1st part of the domain passed in the call to Connect (above).
loAzAuth.Account = "chilkat"
loAzAuth.Scheme = "SharedKey"
loAzAuth.Service = "Blob"
* This causes the "x-ms-version: 2021-08-06" header to be automatically added.
loAzAuth.XMsVersion = "2021-08-06"
lnSuccess = loRest.SetAuthAzureStorage(loAzAuth)

* Note: The application does not need to explicitly set the following
* headers: x-ms-date, Authorization.  These headers
* are automatically set by Chilkat.

* The lease ID needs to be a GUID.  (UUID and GUID are synonymous)
loCrypt = CreateObject('Chilkat.Crypt2')
lcGuid = loCrypt.GenerateUuid()
? "Lease ID: " + lcGuid
lnSuccess = loRest.AddHeader("x-ms-lease-id",lcGuid)

* The action can be "acquire", "renew", "change", "release", or "break".
* See https://msdn.microsoft.com/en-us/library/azure/jj159103.aspx
lnSuccess = loRest.AddHeader("x-ms-lease-action","acquire")

* The lease duration..
lnSuccess = loRest.AddHeader("x-ms-lease-duration","15")

* In this example, we are acquiring a lease for the container named "mycontainer".
lcResponseStr = loRest.FullRequestNoBody("PUT","/mycontainer?restype=container&comp=lease")
IF (loRest.LastMethodSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    RELEASE loAzAuth
    RELEASE loCrypt
    CANCEL
ENDIF

* When successful, the Azure Storage service will respond with a 200, 201, or 202 response status code,
* with no response body.

* The status code depends on the operation:
*    Acquire: A successful operation returns status code 201 (Created).
*    Renew: A successful operation returns status code 200 (OK).
*    Change: A successful operation returns status code 200 (OK).
*    Release: A successful operation returns status code 200 (OK).
*    Break: A successful operation returns status code 202 (Accepted).

IF ((loRest.ResponseStatusCode < 200) OR (loRest.ResponseStatusCode > 202)) THEN
    * Examine the request/response to see what happened.
    ? "response status code = " + STR(loRest.ResponseStatusCode)
    ? "response status text = " + loRest.ResponseStatusText
    ? "response header: " + loRest.ResponseHeader
    ? "response body (if any): " + lcResponseStr
    ? "---"
    ? "LastRequestStartLine: " + loRest.LastRequestStartLine
    ? "LastRequestHeader: " + loRest.LastRequestHeader
    RELEASE loRest
    RELEASE loAzAuth
    RELEASE loCrypt
    CANCEL
ENDIF

? "Success: Lease acquired."

RELEASE loRest
RELEASE loAzAuth
RELEASE loCrypt