Using Iron.mq push queue with PHP

Question

I'm attempting to use the iron.mq push queue, but am having difficulty figuring out how to properly respond to the queue after receiving a message. I realize that I might also not fully understand how the queue system behaves, but my understanding is that it is something like this:

1. Message sent to queue
2. Message pushed from queue to my endpoint
3. Message is 'reserved' until my endpoint responds or times out
4. Endpoint responds with either a 2xx (success) and it is deleted or 4xx/5xx failure, in which case the queue will attempt to resend the message to the endpoint.

For example, my script (using FuelPHP) has something like this:

    $headers = Input::headers(); //gets array of headers sent from ironmq
    $data = @file_get_contents('php://input'); //get the body

Now that I have received the message, I want to do one of two things:

1. Process message and return response to ironmq servers that it was successful
2. Delay the process (by sending a 4xx/5xx?) and have it be resent after a defined period of time.

But... how do you respond to a push message? Using the PHP SDK's deleteMessage method causes an exception as the message appears to no longer exist.

Answer 1

• Version 1. Endpoint responded with status 202. http://dev.iron.io/mq/reference/push_queues/#how_the_endpoint_should_handle_push_messages You should explicitly delete a message after processing via deleteMessagePushStatus()

• Version 2. Endpoint responded with status 200. Message will be deleted automatically, no actions required

so - two ways:

1. 202 -> do long work -> deleteMessagePushStatus()
2. 4xx or 5xx -> 4xx or 5xx (many times) -> 200