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(Lianja) Azure Service Bus - Unlock Message

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

Note: This example requires Chilkat v9.5.0.65 or greater.

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//  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.
loRest = createobject("CkRest")
llBAutoReconnect = .T.
llSuccess = loRest.Connect("<yournamespace>.servicebus.windows.net",443,.T.,llBAutoReconnect)
if (llSuccess <> .T.) then
    ? loRest.LastErrorText
    release loRest
    return
endif

//  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.
loSbToken = createobject("CkStringBuilder")
loSbToken.LoadFile("qa_data/tokens/serviceBusSas.txt","utf-8")

//  Tell the REST object to use the Azure Shared Access Signature for authorization.
loSbToken.Prepend("SharedAccessSignature ")
loRest.AddHeader("Authorization",loSbToken.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.
lcTopicName = "gilaMonster"
lcSubscriptionName = "feedings"
lcMessageId = "7bea513a6ddb49089e07bfbee26d85bd"
lcLockToken = "0a13ee8a-be32-4458-89e0-5e1401caa6a0"

//  Build the path..
loSbPath = createobject("CkStringBuilder")
loSbPath.Append("/{topicPath}/subscriptions/{subscriptionName}/messages/{messageId|sequenceNumber}/{lockToken}")
lnNumReplaced = loSbPath.Replace("{topicPath}",lcTopicName)
lnNumReplaced = loSbPath.Replace("{subscriptionName}",lcSubscriptionName)
lnNumReplaced = loSbPath.Replace("{messageId|sequenceNumber}",lcMessageId)
lnNumReplaced = loSbPath.Replace("{lockToken}",lcLockToken)

//  Add a timeout parameter.
loRest.AddQueryParam("timeout","60")

//  Use the PUT HTTP verb to unlock the message.
loSbResponseBody = createobject("CkStringBuilder")
llSuccess = loRest.FullRequestNoBodySb("PUT",loSbPath.GetAsString(),loSbResponseBody)
if (llSuccess <> .T.) then
    ? loRest.LastErrorText
    release loRest
    release loSbToken
    release loSbPath
    release loSbResponseBody
    return
endif

? "Response Status Code = " + str(loRest.ResponseStatusCode)

//  Check for a success response.
if (loRest.ResponseStatusCode <> 200) then
    ? loRest.LastRequestStartLine
    ? loRest.LastRequestHeader
    ? loSbResponseBody.GetAsString()
    ? "Failed."
    release loRest
    release loSbToken
    release loSbPath
    release loSbResponseBody
    return
endif

//  If successful, the response body would be empty..
? "Success."


release loRest
release loSbToken
release loSbPath
release loSbResponseBody

 

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