#include <assert.h>
#include <broker/broker.hh>
#include <iostream>
#include <poll.h>

using namespace broker;

int main() {}

void f1() {
  // --attach-master-start
  endpoint ep;
  auto ds = ep.attach_master("foo", backend::memory);
  // --attach-master-end

  // --get-with-error-start
  auto result = ds->get("foo");
  if (result)
    std::cout << *result << std::endl; // Print current value of 'foo'.
  else if (result.error() == ec::no_such_key)
    std::cout << "key 'foo' does not exist'" << std::endl;
  else if (result.error() == ec::backend_failure)
    std::cout << "something went wrong with the backend" << std::endl;
  else
    std::cout << "could not retrieve value at key 'foo'" << std::endl;
  // --get-with-error-end

  ///

  // --proxy-start
  // Add a value to a data store (master or clone).
  ds->put("foo", 42);
  // Create a proxy.
  auto proxy = store::proxy{*ds};
  // Perform an asynchyronous request to look up a value.
  auto id = proxy.get("foo");
  // Get a file descriptor for event loops.
  auto fd = proxy.mailbox().descriptor();
  // Wait for result.
  ::pollfd p = {fd, POLLIN, 0};
  auto n = ::poll(&p, 1, -1);
  if (n < 0)
    std::terminate(); // poll failed

  if (n == 1 && p.revents & POLLIN) {
    auto response = proxy.receive(); // Retrieve result, won't block now.
    assert(response.id == id);
    // Check whether we got data or an error.
    if (response.answer)
      std::cout << *response.answer << std::endl; // may print 42
    else if (response.answer.error() == ec::no_such_key)
      std::cout << "no such key: 'foo'" << std::endl;
    else
      std::cout << "failed to retrieve value at key 'foo'" << std::endl;
  }
  // --proxy-end
}