(Objective-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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#import <CkoRest.h>
#import <CkoStringBuilder.h>
#import <NSString.h>
#import <CkoJsonObject.h>

// 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.
CkoRest *rest = [[CkoRest alloc] init];
BOOL bAutoReconnect = YES;
BOOL success = [rest Connect: @"<yournamespace>.servicebus.windows.net" port: [NSNumber numberWithInt: 443] tls: YES autoReconnect: bAutoReconnect];
if (success != YES) {
    NSLog(@"%@",rest.LastErrorText);
    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.
CkoStringBuilder *sbToken = [[CkoStringBuilder alloc] init];
[sbToken LoadFile: @"qa_data/tokens/serviceBusSas.txt" charset: @"utf-8"];

// Tell the REST object to use the Azure Shared Access Signature for authorization.
[sbToken Prepend: @"SharedAccessSignature "];
[rest AddHeader: @"Authorization" value: [sbToken GetAsString]];

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

// 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";
NSString *topicName = @"gilaMonster";

// The HTTP request body contains the content of the message sent to the topic.
CkoStringBuilder *sbRequestBody = [[CkoStringBuilder alloc] init];
[sbRequestBody Append: @"Hello, I'm a gila monster!"];

// Build the path..
CkoStringBuilder *sbPath = [[CkoStringBuilder alloc] init];
[sbPath Append: @"/"];
[sbPath Append: topicName];
[sbPath Append: @"/messages"];

// Add timeout and api-version query parameters.
[rest AddQueryParam: @"timeout" value: @"20"];
[rest AddQueryParam: @"api-version" value: @"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..
CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json AppendInt: @"TimeToLive" value: [NSNumber numberWithInt: 3600]];
[json AppendString: @"Label" value: @"A123"];
[rest AddHeader: @"BrokerProperties" value: [json Emit]];

// To add custom properties, such as "Priority" and "Color"
[rest AddHeader: @"Priority" value: @"High"];
[rest AddHeader: @"Color" value: @"pink"];

CkoStringBuilder *sbResponseBody = [[CkoStringBuilder alloc] init];
success = [rest FullRequestSb: @"POST" uriPath: [sbPath GetAsString] requestBody: sbRequestBody responseBody: sbResponseBody];
if (success != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

NSLog(@"%@%d",@"Response Status Code = ",[rest.ResponseStatusCode intValue]);

// Check for a success response.
if ([rest.ResponseStatusCode intValue] != 201) {
    NSLog(@"%@",rest.LastRequestStartLine);
    NSLog(@"%@",rest.LastRequestHeader);
    NSLog(@"%@",[sbResponseBody GetAsString]);
    NSLog(@"%@",@"Failed.");
    return;
}

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

NSLog(@"%@",@"Success.");