Moving from cocaine 11 to 12

[bioothod]

Hi

There is a question about moving apparently client app from 11 to 12 cocaine at reverbrain mail list, please take a look and reply both here and in the mailgroup

We are trying move from cocaine 11 to 12 and I'm investigating details. I didn't find any docs about writing applications with cocaine12 and examples are too simple.
Now I'm interested how properly send big array of bytes in chunks?

App:

worker.on("ping", [](worker::sender tx, worker::receiver rx) {
       std::cout << "After invoke" << std::endl;
       if (boost::optional<std::string> message = rx.recv().get()) { // app read one chunk
            std::cout << "After chunk: '" << *message << "'" << std::endl;
           tx.write(*message).get(); // app write one chunk
            std::cout << "After write" << std::endl;
       }
       std::cout << "After close" << std::endl;
   });

Client:

task<void>::future_type
on_invoke(task<channel<io::app::enqueue>>::future_move_type future) {
   auto channel = future.get();
   auto tx = std::move(channel.tx);
   auto rx = std::move(channel.rx);
   return tx.send<scope::chunk>("le message") // client write one chunk
        .then(trace_t::bind(&on_send, std::placeholders::_1, rx))
       .then(trace_t::bind(&on_chunk, std::placeholders::_1, rx)) // client read one chunk
        .then(trace_t::bind(&on_choke, std::placeholders::_1));
}

In this example I see how to send one chunk from client to app and backward. But what should I do if I want to send 3 chunks from client to app and after that 5 chunks from app to client?

https://groups.google.com/forum/#!topic/reverbrain/4VGLV2-yIac