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 <C_CkRest.h>
#include <C_CkAuthAzureStorage.h>
#include <C_CkStream.h>
#include <C_CkTask.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkRest rest;
    BOOL bTls;
    int port;
    BOOL bAutoReconnect;
    HCkAuthAzureStorage azAuth;
    HCkStream sendStream;
    HCkTask task;
    int curPctDone;
    int responseStatusCode;
    const char *responseBodyStr;

    success = FALSE;

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

    rest = CkRest_Create();

    // Connect to the Azure Storage Blob Service
    bTls = TRUE;
    port = 443;
    bAutoReconnect = TRUE;
    // In this example, the storage account name is "chilkat".
    success = CkRest_Connect(rest,"chilkat.blob.core.windows.net",port,bTls,bAutoReconnect);
    if (success != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        return;
    }

    // Provide Azure Cloud credentials for the REST call.
    azAuth = CkAuthAzureStorage_Create();
    CkAuthAzureStorage_putAccessKey(azAuth,"AZURE_ACCESS_KEY");
    // The account name used here should match the 1st part of the domain passed in the call to Connect (above).
    CkAuthAzureStorage_putAccount(azAuth,"chilkat");
    CkAuthAzureStorage_putScheme(azAuth,"SharedKey");
    CkAuthAzureStorage_putService(azAuth,"Blob");
    // This causes the "x-ms-version: 2021-08-06" header to be automatically added.
    CkAuthAzureStorage_putXMsVersion(azAuth,"2021-08-06");
    success = CkRest_SetAuthAzureStorage(rest,azAuth);

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

    sendStream = CkStream_Create();

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

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

    // Start the task. 
    success = CkTask_Run(task);

    // In this example, we'll simply sleep and periodically
    // check to see if the REST upload if finished.
    curPctDone = 0;
    while (CkTask_getFinished(task) != TRUE) {
        CkTask_SleepMs(task,100);
    }

    // Check to see if the call to FullRequestStream in the background thread pool succeeded.
    if (CkTask_getTaskSuccess(task) != TRUE) {
        // Show what would've been the LastErrorText had FullRequestStream been called synchronously
        printf("%s\n",CkTask_resultErrorText(task));
        CkTask_Dispose(task);
        CkRest_Dispose(rest);
        CkAuthAzureStorage_Dispose(azAuth);
        CkStream_Dispose(sendStream);
        return;
    }

    responseStatusCode = CkRest_getResponseStatusCode(rest);

    // 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) {
        printf("File uploaded.\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.
        responseBodyStr = CkTask_getResultString(task);
        printf("response body (if any): %s\n",responseBodyStr);

        // Examine the request/response to see what happened.
        printf("response status code = %d\n",CkRest_getResponseStatusCode(rest));
        printf("response status text = %s\n",CkRest_responseStatusText(rest));
        printf("response header: %s\n",CkRest_responseHeader(rest));
        printf("---\n");
        printf("LastRequestStartLine: %s\n",CkRest_lastRequestStartLine(rest));
        printf("LastRequestHeader: %s\n",CkRest_lastRequestHeader(rest));
    }

    CkTask_Dispose(task);


    CkRest_Dispose(rest);
    CkAuthAzureStorage_Dispose(azAuth);
    CkStream_Dispose(sendStream);

    }