C++

REST Asynchronous Streaming Upload File

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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. C++

#include <CkRest.h>
#include <CkAuthAzureStorage.h>
#include <CkStream.h>
#include <CkTask.h>

void ChilkatSample(void)
    {
    bool success = false;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkRest rest;

    // Connect to the Azure Storage Blob Service
    bool bTls = true;
    int port = 443;
    bool 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) {
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    // Provide Azure Cloud credentials for the REST call.
    CkAuthAzureStorage azAuth;
    azAuth.put_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.put_Account("chilkat");
    azAuth.put_Scheme("SharedKey");
    azAuth.put_Service("Blob");
    // This causes the "x-ms-version: 2021-08-06" header to be automatically added.
    azAuth.put_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.

    CkStream sendStream;

    // Define the source data for the stream to be a file.
    sendStream.put_SourceFile("qa_data/hamlet.xml");

    // Create a background thread task to upload from the stream
    // The name of the Azure storage container is "test".
    CkTask *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.
    int curPctDone = 0;
    while (task->get_Finished() != true) {
        task->SleepMs(100);
    }

    // Check to see if the call to FullRequestStream in the background thread pool succeeded.
    if (task->get_TaskSuccess() != true) {
        // Show what would've been the LastErrorText had FullRequestStream been called synchronously
        std::cout << task->resultErrorText() << "\r\n";
        delete task;
        return;
    }

    int responseStatusCode = rest.get_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) {
        std::cout << "File uploaded." << "\r\n";
    }
    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.
        const char *responseBodyStr = task->getResultString();
        std::cout << "response body (if any): " << responseBodyStr << "\r\n";

        // Examine the request/response to see what happened.
        std::cout << "response status code = " << rest.get_ResponseStatusCode() << "\r\n";
        std::cout << "response status text = " << rest.responseStatusText() << "\r\n";
        std::cout << "response header: " << rest.responseHeader() << "\r\n";
        std::cout << "---" << "\r\n";
        std::cout << "LastRequestStartLine: " << rest.lastRequestStartLine() << "\r\n";
        std::cout << "LastRequestHeader: " << rest.lastRequestHeader() << "\r\n";
    }

    delete task;
    }