B4X

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. B4X

Dim success As Boolean = 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 ChilkatRest
rest.Initialize("rest")

'  Connect to the Azure Storage Blob Service
Dim bTls As Boolean = True
Dim port As Int = 443
Dim bAutoReconnect As Boolean = 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
    Log(rest.LastErrorText)
    Return
End If


'  Provide Azure Cloud credentials for the REST call.
Dim azAuth As ChilkatAuthAzureStorage
azAuth.Initialize
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 ChilkatCrypt2
crypt.Initialize("crypt")
Dim guid As String = crypt.GenerateUuid
Log("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 = rest.FullRequestNoBody("PUT", "/mycontainer?restype=container&comp=lease")
If rest.LastMethodSuccess <> True Then
    Log(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.
    Log("response status code = " & rest.ResponseStatusCode)
    Log("response status text = " & rest.ResponseStatusText)
    Log("response header: " & rest.ResponseHeader)
    Log("response body (if any): " & responseStr)
    Log("---")
    Log("LastRequestStartLine: " & rest.LastRequestStartLine)
    Log("LastRequestHeader: " & rest.LastRequestHeader)
    Return
End If


Log("Success: Lease acquired.")