(C) Azure Storage: Lease Container

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.

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#include <C_CkRest.h>
#include <C_CkAuthAzureStorage.h>
#include <C_CkCrypt2.h>

void ChilkatSample(void)
    {
    HCkRest rest;
    BOOL bTls;
    int port;
    BOOL bAutoReconnect;
    BOOL success;
    HCkAuthAzureStorage azAuth;
    HCkCrypt2 crypt;
    const char *guid;
    const char *responseStr;

    // 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.

    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: 2020-08-04" header to be automatically added.
    CkAuthAzureStorage_putXMsVersion(azAuth,"2020-08-04");
    success = CkRest_SetAuthAzureStorage(rest,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)
    crypt = CkCrypt2_Create();
    guid = CkCrypt2_generateUuid(crypt);
    printf("Lease ID: %s\n",guid);
    success = CkRest_AddHeader(rest,"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 = CkRest_AddHeader(rest,"x-ms-lease-action","acquire");

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

    // In this example, we are acquiring a lease for the container named "mycontainer".
    responseStr = CkRest_fullRequestNoBody(rest,"PUT","/mycontainer?restype=container&comp=lease");
    if (CkRest_getLastMethodSuccess(rest) != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        CkAuthAzureStorage_Dispose(azAuth);
        CkCrypt2_Dispose(crypt);
        return;
    }

    // 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 ((CkRest_getResponseStatusCode(rest) < 200) || (CkRest_getResponseStatusCode(rest) > 202)) {
        // 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("response body (if any): %s\n",responseStr);
        printf("---\n");
        printf("LastRequestStartLine: %s\n",CkRest_lastRequestStartLine(rest));
        printf("LastRequestHeader: %s\n",CkRest_lastRequestHeader(rest));
        CkRest_Dispose(rest);
        CkAuthAzureStorage_Dispose(azAuth);
        CkCrypt2_Dispose(crypt);
        return;
    }

    printf("Success: Lease acquired.\n");


    CkRest_Dispose(rest);
    CkAuthAzureStorage_Dispose(azAuth);
    CkCrypt2_Dispose(crypt);

    }