How to impl a request-response-acknowledge protocol with tokio-tower?

[matthiasbeyer]

Hi,

I have a protocol that expects me to send an "Acknowledge" message after I received a "response".

I successfully implemented a server part, where a client connects and messages are handled successfully:

• Client sends "connect"
• Server sends "Connect Response"
• Client sends "Connect Response Acknowledge"

Right now, we do nothing with the acknowledge. We just drop the message. We do not even verify that the acknowledge can be associated with a prior "response" (operation IDs and such are not verified).

Now I need to implement a request-response-acknowledge flow where the server initiates the request on an existing connection (aka. the "remote" part initiated the connection):

• Server sends some "Get" message
• Client sends "Get Response" message
• Server sends "Get Response Acknowledge" message

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My questions:

• Is this even the right crate to implement this with?
• How to implement said behavior? What are the interfaces I want to look at? I feel like the Client types are not what I want, do I?

Unfortunately, I cannot share the code I am working on.