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#include <wanda/control_interface.hpp>
#include <wanda/logging.hpp>
#include <wanda/optional.hpp>
#include <spdlog/fmt/ostr.h>
#include <unistd.h>
#include <algorithm>
#include <iterator>
#include <string>
#include <system_error>
#include <utility>
namespace wanda
{
// 'socket_deleter' implementation
socket_deleter::~socket_deleter()
{
if (std::filesystem::exists(path))
{
std::filesystem::remove(path);
}
}
// 'control_interface' implementation
control_interface::control_interface(control_interface::key key, asio::io_service & service, control_interface::protocol::endpoint endpoint, listener & listener)
: keyed{key}
, m_service{service}
, m_endpoint{std::move(endpoint)}
, m_socket{m_service}
, m_acceptor{m_service}
, m_listener{listener}
{
}
std::error_code control_interface::start()
{
if (auto error = std::error_code{}; m_acceptor.open(m_endpoint.protocol(), error))
{
return error;
}
if (auto error = std::error_code{}; m_acceptor.bind(m_endpoint, error))
{
return error;
}
if (auto error = std::error_code{}; m_acceptor.listen(128, error))
{
return error;
}
else
{
perform_accept();
return error;
}
}
std::error_code control_interface::shutdown()
{
for (auto & connection : m_connections)
{
connection->close();
}
auto error = std::error_code{};
return m_acceptor.close(error);
}
void control_interface::perform_accept()
{
m_acceptor.async_accept(m_socket, [that = shared_from_this(), this](auto const & error) {
if (error && error != asio::error::operation_aborted)
{
get_logger()->error("failed to accept connection because '{}'", error);
}
else
{
get_logger()->info("new incoming controller connection");
auto [connection, inserted] = m_connections.insert(make_control_connection(std::move(m_socket)));
if (inserted)
{
(*connection)->add(this);
(*connection)->start();
}
perform_accept();
}
});
}
void control_interface::on_close(control_connection::pointer connection)
{
if (static_cast<char>(connection->current_state()) >= static_cast<char>(control_connection::state::established))
{
get_logger()->info("controller connection closed");
}
else
{
get_logger()->info("controller connection aborted before it could be established");
}
m_connections.erase(connection);
}
void control_interface::on_received(control_connection::pointer connection, message message)
{
using namespace wanda::std_ext;
if (m_connections.find(connection) == m_connections.cend())
{
get_logger()->error("received message from an unknown connection");
return;
}
if (message.source != message_source_controller)
{
get_logger()->error("received a deamon message");
return;
}
if (auto state = connection->current_state(); message.command == message_command_hello && state == control_connection::state::fresh)
{
get_logger()->info("controller connection established");
if (message.argument.has_value())
{
get_logger()->info("remote controller version '{}'", *message.argument);
}
connection->send({message_source_daemon, message_command_hello, message_argument_hello});
connection->update(control_connection::state::established);
}
else
{
with(make_command(message), [&](auto const & command) {
m_listener.on_received(*this, command);
}) ||
[&] { get_logger()->warn("ignoring unknown message '{}'", message); };
}
}
control_interface::pointer make_interface(asio::io_service & service, std::filesystem::path socket, control_interface::listener & listener)
{
if (std::filesystem::exists(socket))
{
get_logger()->error("socket '{}' exists", socket.native());
return {};
}
control_interface::protocol::endpoint endpoint{socket.string()};
return std::make_shared<control_interface>(control_interface::key{}, service, std::move(endpoint), listener);
}
} // namespace wanda
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