Xojo Plugin

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. Xojo Plugin

Dim success As Boolean
success = False

// 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.

Dim rest As New Chilkat.Rest

// Connect to the Azure Storage Blob Service
Dim bTls As Boolean
bTls = True
Dim port As Int32
port = 443
Dim bAutoReconnect As Boolean
bAutoReconnect = True
// In this example, the storage account name is "chilkat".
success = rest.Connect("chilkat.blob.core.windows.net",port,bTls,bAutoReconnect)
If (success <> True) Then
    System.DebugLog(rest.LastErrorText)
    Return
End If

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

// 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)
Dim crypt As New Chilkat.Crypt2
Dim guid As String
guid = crypt.GenerateUuid()
System.DebugLog("Lease ID: " + guid)
success = rest.AddHeader("x-ms-lease-id",guid)

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

// The lease duration..
success = rest.AddHeader("x-ms-lease-duration","15")

// In this example, we are acquiring a lease for the container named "mycontainer".
Dim responseStr As String
responseStr = rest.FullRequestNoBody("PUT","/mycontainer?restype=container&comp=lease")
If (rest.LastMethodSuccess <> True) Then
    System.DebugLog(rest.LastErrorText)
    Return
End If

// 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 ((rest.ResponseStatusCode < 200) Or (rest.ResponseStatusCode > 202)) Then
    // Examine the request/response to see what happened.
    System.DebugLog("response status code = " + Str(rest.ResponseStatusCode))
    System.DebugLog("response status text = " + rest.ResponseStatusText)
    System.DebugLog("response header: " + rest.ResponseHeader)
    System.DebugLog("response body (if any): " + responseStr)
    System.DebugLog("---")
    System.DebugLog("LastRequestStartLine: " + rest.LastRequestStartLine)
    System.DebugLog("LastRequestHeader: " + rest.LastRequestHeader)
    Return
End If

System.DebugLog("Success: Lease acquired.")