(Xojo Plugin) REST Asynchronous Streaming Upload File

Demonstrates how to asynchronous streaming upload a file to cloud storage. This particular example demonstrates an upload to the Azure Cloud Storage service. The same concepts apply to S3, Google Cloud, and Google Drive.

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// 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".
Dim success As Boolean
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)

// Set some request headers.
success = rest.AddHeader("x-ms-blob-content-disposition","attachment; filename=""thisIsATest.txt""")
success = rest.AddHeader("x-ms-blob-type","BlockBlob")
success = rest.AddHeader("x-ms-meta-m1","v1")
success = rest.AddHeader("x-ms-meta-m2","v2")

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

Dim sendStream As New Chilkat.Stream

// Define the source data for the stream to be a file.
sendStream.SourceFile = "qa_data/hamlet.xml"

// Create a background thread task to upload from the stream
// The name of the Azure storage container is "test".
Dim task As Chilkat.Task
task = rest.FullRequestStreamAsync("PUT","/test/thisIsATest.txt",sendStream)

// Start the task. 
success = task.Run()

// In this example, we'll simply sleep and periodically
// check to see if the REST upload if finished.
Dim curPctDone As Int32
curPctDone = 0
While task.Finished <> True
    task.SleepMs 100
Wend

// Check to see if the call to FullRequestStream in the background thread pool succeeded.
If (task.TaskSuccess <> True) Then
    // Show what would've been the LastErrorText had FullRequestStream been called synchronously
    System.DebugLog(task.ResultErrorText)

    Return
End If

Dim responseStatusCode As Int32
responseStatusCode = rest.ResponseStatusCode

// When successful, the Azure Storage service will respond with a 201 response code,
// with an empty body.  Therefore, in the success condition, the responseStr is empty.
If (responseStatusCode = 201) Then
    System.DebugLog("File uploaded.")
Else
    // It failed, so examine the response body, if one was returned:
    // Given that FullRequestStream returns a string, the return value is obtained via GetResultString.
    Dim responseBodyStr As String
    responseBodyStr = task.GetResultString()
    System.DebugLog("response body (if any): " + responseBodyStr)

    // 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("---")
    System.DebugLog("LastRequestStartLine: " + rest.LastRequestStartLine)
    System.DebugLog("LastRequestHeader: " + rest.LastRequestHeader)
End If