(Visual FoxPro) Azure Storage: Lease Container

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.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

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

* 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.

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Rest')
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.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.AuthAzureStorage')
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)
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Crypt2')
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