(Go) 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.

Chilkat Go Downloads Go Package for Windows, MacOS, Linux, Alpine Linux, Solaris

    // 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 := chilkat.NewRest()
    bAutoReconnect := true
    success := rest.Connect("<yournamespace>.servicebus.windows.net",443,true,bAutoReconnect)
    if success != true {
        fmt.Println(rest.LastErrorText())
        rest.DisposeRest()
        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 := chilkat.NewStringBuilder()
    sbToken.LoadFile("qa_data/tokens/serviceBusSas.txt","utf-8")

    // Tell the REST object to use the Azure Shared Access Signature for authorization.
    sbToken.Prepend("SharedAccessSignature ")
    rest.AddHeader("Authorization",*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";
    topicName := "gilaMonster"

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

    // Build the path..
    sbPath := chilkat.NewStringBuilder()
    sbPath.Append("/")
    sbPath.Append(topicName)
    sbPath.Append("/messages")

    // Add timeout and api-version query parameters.
    rest.AddQueryParam("timeout","20")
    rest.AddQueryParam("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 := chilkat.NewJsonObject()
    json.AppendInt("TimeToLive",3600)
    json.AppendString("Label","A123")
    rest.AddHeader("BrokerProperties",*json.Emit())

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

    sbResponseBody := chilkat.NewStringBuilder()
    success = rest.FullRequestSb("POST",*sbPath.GetAsString(),sbRequestBody,sbResponseBody)
    if success != true {
        fmt.Println(rest.LastErrorText())
        rest.DisposeRest()
        sbToken.DisposeStringBuilder()
        sbRequestBody.DisposeStringBuilder()
        sbPath.DisposeStringBuilder()
        json.DisposeJsonObject()
        sbResponseBody.DisposeStringBuilder()
        return
    }

    fmt.Println("Response Status Code = ", rest.ResponseStatusCode())

    // Check for a success response.
    if rest.ResponseStatusCode() != 201 {
        fmt.Println(rest.LastRequestStartLine())
        fmt.Println(rest.LastRequestHeader())
        fmt.Println(*sbResponseBody.GetAsString())
        fmt.Println("Failed.")
        rest.DisposeRest()
        sbToken.DisposeStringBuilder()
        sbRequestBody.DisposeStringBuilder()
        sbPath.DisposeStringBuilder()
        json.DisposeJsonObject()
        sbResponseBody.DisposeStringBuilder()
        return
    }

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

    fmt.Println("Success.")

    rest.DisposeRest()
    sbToken.DisposeStringBuilder()
    sbRequestBody.DisposeStringBuilder()
    sbPath.DisposeStringBuilder()
    json.DisposeJsonObject()
    sbResponseBody.DisposeStringBuilder()