(Swift 2) Azure Service Bus - Unlock Message

See more Azure Service Bus Examples

Shows how to unlock a message for processing by other receivers on a specified queue or subscription. This operation deletes the lock object, causing the message to be unlocked.

For more information, see https://docs.microsoft.com/en-us/rest/api/servicebus/unlock-message

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func chilkatTest() {
    // 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.
    let rest = CkoRest()
    var bAutoReconnect: Bool = true
    var success: Bool = rest.Connect("<yournamespace>.servicebus.windows.net", port: 443, tls: true, autoReconnect: bAutoReconnect)
    if success != true {
        print("\(rest.LastErrorText)")
        return
    }

    // 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.
    let sbToken = CkoStringBuilder()
    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 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..
    // ----------------------------------------------------------------------------------------------

    // To unlock a message, we'll need either the SequenceNumber or MessageId.
    // When the message was locked, the SequenceNumber and MessageId of the locked message
    // was returned in the HTTP response header named "BrokerProperties, which contained
    // JSON such as the following:

    // 	{
    // 	  "DeliveryCount": 2,
    // 	  "EnqueuedSequenceNumber": 3000003,
    // 	  "EnqueuedTimeUtc": "Wed, 07 Dec 2016 17:42:48 GMT",
    // 	  "Label": "M2",
    // 	  "LockToken": "0a13ee8a-be32-4458-89e0-5e1401caa6a0",
    // 	  "LockedUntilUtc": "Wed, 07 Dec 2016 18:13:12 GMT",
    // 	  "MessageId": "7bea513a6ddb49089e07bfbee26d85bd",
    // 	  "SequenceNumber": 3,
    // 	  "State": "Active",
    // 	  "TimeToLive": 922337203685.47754
    // 	}

    // The path for unlocking a message is constructed as follows, depending on
    // whether it is a message on a queue or subscription:
    // 
    // (for a queue)
    // /{queuePath}/messages/{messageId|sequenceNumber}/{lockToken}
    // 
    // (for a subscription)
    // /{topicPath}/subscriptions/{subscriptionName}/messages/{messageId|sequenceNumber}/{lockToken}

    // This example will build a path to unlock a message contained in a subscription.
    var topicName: String? = "gilaMonster"
    var subscriptionName: String? = "feedings"
    var messageId: String? = "7bea513a6ddb49089e07bfbee26d85bd"
    var lockToken: String? = "0a13ee8a-be32-4458-89e0-5e1401caa6a0"

    // Build the path..
    let sbPath = CkoStringBuilder()
    sbPath.Append("/{topicPath}/subscriptions/{subscriptionName}/messages/{messageId|sequenceNumber}/{lockToken}")
    var numReplaced: Int = sbPath.Replace("{topicPath}", replacement: topicName).intValue
    numReplaced = sbPath.Replace("{subscriptionName}", replacement: subscriptionName).intValue
    numReplaced = sbPath.Replace("{messageId|sequenceNumber}", replacement: messageId).intValue
    numReplaced = sbPath.Replace("{lockToken}", replacement: lockToken).intValue

    // Add a timeout parameter.
    rest.AddQueryParam("timeout", value: "20")

    // Use the PUT HTTP verb to unlock the message.
    let sbResponseBody = CkoStringBuilder()
    success = rest.FullRequestNoBodySb("PUT", uriPath: sbPath.GetAsString(), sb: sbResponseBody)
    if success != true {
        print("\(rest.LastErrorText)")
        return
    }

    print("Response Status Code = \(rest.ResponseStatusCode.intValue)")

    // Check for a success response.
    if rest.ResponseStatusCode.intValue != 200 {
        print("\(rest.LastRequestStartLine)")
        print("\(rest.LastRequestHeader)")
        print("\(sbResponseBody.GetAsString())")
        print("Failed.")
        return
    }

    // If successful, the response body would be empty..
    print("Success.")

}