(Lianja) 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.

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// 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("CkRest")

// Connect to the Azure Storage Blob Service
llBTls = .T.
lnPort = 443
llBAutoReconnect = .T.
// In this example, the storage account name is "chilkat".
llSuccess = loRest.Connect("chilkat.blob.core.windows.net",lnPort,llBTls,llBAutoReconnect)
if (llSuccess <> .T.) then
    ? loRest.LastErrorText
    release loRest
    return
endif

// Provide Azure Cloud credentials for the REST call.
loAzAuth = createobject("CkAuthAzureStorage")
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: 2020-08-04" header to be automatically added.
loAzAuth.XMsVersion = "2020-08-04"
llSuccess = 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("CkCrypt2")
lcGuid = loCrypt.GenerateUuid()
? "Lease ID: " + lcGuid
llSuccess = 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
llSuccess = loRest.AddHeader("x-ms-lease-action","acquire")

// The lease duration..
llSuccess = 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 <> .T.) then
    ? loRest.LastErrorText
    release loRest
    release loAzAuth
    release loCrypt
    return
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
    return
endif

? "Success: Lease acquired."


release loRest
release loAzAuth
release loCrypt