Method statistics

src/slave/http.cpp:2680–2714

Future<Response> Http::statistics(
    const Request& request,
    const Option<Principal>& principal) const
{
  // TODO(nfnt): Remove check for enabled
  // authorization as part of MESOS-5346.
  if (request.method != "GET" && slave->authorizer.isSome()) {
    return MethodNotAllowed({"GET"}, request.method);
  }

  Try<string> endpoint = extractEndpoint(request.url);
  if (endpoint.isError()) {
    return Failure("Failed to extract endpoint: " + endpoint.error());
  }

  return authorizeEndpoint(
      endpoint.get(),
      request.method,
      slave->authorizer,
      principal)
    .then(defer(
        slave->self(),
        [this, request](bool authorized) -> Future<Response> {
          if (!authorized) {
            return Forbidden();
          }

          return statisticsLimiter->acquire()
            .then(defer(slave->self(), &Slave::usage))
            .then(defer(slave->self(),
                  [this, request](const ResourceUsage& usage) {
              return _statistics(usage, request);
            }));
        }));
}


Response Http::_statistics(