(C) Azure Service Bus - Send Message to Topic

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Example code showing how to send a message to an Azure Service Bus Topic.

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#include <C_CkRest.h>
#include <C_CkStringBuilder.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    HCkRest rest;
    BOOL bAutoReconnect;
    BOOL success;
    HCkStringBuilder sbToken;
    const char *topicName;
    HCkStringBuilder sbRequestBody;
    HCkStringBuilder sbPath;
    HCkJsonObject json;
    HCkStringBuilder sbResponseBody;

    // Note: Requires Chilkat v9.5.0.65 or greater.

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

    // Make the initial connection.
    // A single REST object, once connected, can be used for many Azure Service Bus REST API calls.
    // The auto-reconnect indicates that if the already-established HTTPS connection is closed,
    // then it will be automatically re-established as needed.
    rest = CkRest_Create();
    bAutoReconnect = TRUE;
    success = CkRest_Connect(rest,"<yournamespace>.servicebus.windows.net",443,TRUE,bAutoReconnect);
    if (success != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        return;
    }

    // ----------------------------------------------------------------------------------------------
    // The code above this comment could be placed inside a function/subroutine within the application
    // because the connection does not need to be made for every request.  Once the connection is made
    // the app may send many requests..
    // ----------------------------------------------------------------------------------------------

    // Let's load a previously computed SAS token and use it.
    // See Azure Shared Access Signature for an example to genenerate an Azure SAS token.
    sbToken = CkStringBuilder_Create();
    CkStringBuilder_LoadFile(sbToken,"qa_data/tokens/serviceBusSas.txt","utf-8");

    // Tell the REST object to use the Azure Shared Access Signature for authorization.
    CkStringBuilder_Prepend(sbToken,"SharedAccessSignature ");
    CkRest_AddHeader(rest,"Authorization",CkStringBuilder_getAsString(sbToken));

    // ----------------------------------------------------------------------------------------------

    // The code for sending to a topic is identical to the code sending to a queue.
    // The only difference is that a topic name (or topic path) is used instead of queue name/path.

    // Send to a topic named "gilaMonster";
    topicName = "gilaMonster";

    // The HTTP request body contains the content of the message sent to the topic.
    sbRequestBody = CkStringBuilder_Create();
    CkStringBuilder_Append(sbRequestBody,"Hello, I'm a gila monster!");

    // Build the path..
    sbPath = CkStringBuilder_Create();
    CkStringBuilder_Append(sbPath,"/");
    CkStringBuilder_Append(sbPath,topicName);
    CkStringBuilder_Append(sbPath,"/messages");

    // Add timeout and api-version query parameters.
    CkRest_AddQueryParam(rest,"timeout","20");
    CkRest_AddQueryParam(rest,"api-version","2013-08");

    // Standard brokered message properties are placed in a BrokerProperties HTTP header. 
    // The broker properties must be serialized in JSON format. To specify a TimeToLive value of 3600 seconds 
    // and to add a message label "M1" to the message..
    json = CkJsonObject_Create();
    CkJsonObject_AppendInt(json,"TimeToLive",3600);
    CkJsonObject_AppendString(json,"Label","A123");
    CkRest_AddHeader(rest,"BrokerProperties",CkJsonObject_emit(json));

    // To add custom properties, such as "Priority" and "Color"
    CkRest_AddHeader(rest,"Priority","High");
    CkRest_AddHeader(rest,"Color","pink");

    sbResponseBody = CkStringBuilder_Create();
    success = CkRest_FullRequestSb(rest,"POST",CkStringBuilder_getAsString(sbPath),sbRequestBody,sbResponseBody);
    if (success != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        CkStringBuilder_Dispose(sbToken);
        CkStringBuilder_Dispose(sbRequestBody);
        CkStringBuilder_Dispose(sbPath);
        CkJsonObject_Dispose(json);
        CkStringBuilder_Dispose(sbResponseBody);
        return;
    }

    printf("Response Status Code = %d\n",CkRest_getResponseStatusCode(rest));

    // Check for a success response.
    if (CkRest_getResponseStatusCode(rest) != 201) {
        printf("%s\n",CkRest_lastRequestStartLine(rest));
        printf("%s\n",CkRest_lastRequestHeader(rest));
        printf("%s\n",CkStringBuilder_getAsString(sbResponseBody));
        printf("Failed.\n");
        CkRest_Dispose(rest);
        CkStringBuilder_Dispose(sbToken);
        CkStringBuilder_Dispose(sbRequestBody);
        CkStringBuilder_Dispose(sbPath);
        CkJsonObject_Dispose(json);
        CkStringBuilder_Dispose(sbResponseBody);
        return;
    }

    // If successful, the 201 response will have no response body.

    printf("Success.\n");


    CkRest_Dispose(rest);
    CkStringBuilder_Dispose(sbToken);
    CkStringBuilder_Dispose(sbRequestBody);
    CkStringBuilder_Dispose(sbPath);
    CkJsonObject_Dispose(json);
    CkStringBuilder_Dispose(sbResponseBody);

    }