core/dbus_wrap.h

   1 #ifndef CORE_DBUS_WRAP_H
   2 #define CORE_DBUS_WRAP_H
   3
   4 #include <memory>
   5
   6 #include <dbus/dbus.h>
   7
   8 #include "dynload.h"
   9
  10 #ifdef HAVE_DYNLOAD
  11
  12 #include <mutex>
  13
  14 #define DBUS_FUNCTIONS(MAGIC) \
  15 MAGIC(dbus_error_init) \
  16 MAGIC(dbus_error_free) \
  17 MAGIC(dbus_bus_get) \
  18 MAGIC(dbus_connection_set_exit_on_disconnect) \
  19 MAGIC(dbus_connection_unref) \
  20 MAGIC(dbus_connection_send_with_reply_and_block) \
  21 MAGIC(dbus_message_unref) \
  22 MAGIC(dbus_message_new_method_call) \
  23 MAGIC(dbus_message_append_args) \
  24 MAGIC(dbus_message_iter_init) \
  25 MAGIC(dbus_message_iter_next) \
  26 MAGIC(dbus_message_iter_recurse) \
  27 MAGIC(dbus_message_iter_get_arg_type) \
  28 MAGIC(dbus_message_iter_get_basic) \
  29 MAGIC(dbus_set_error_from_message)
  30
  31 inline void *dbus_handle{};
  32 #define DECL_FUNC(x) inline decltype(x) *p##x{};
  33 DBUS_FUNCTIONS(DECL_FUNC)
  34 #undef DECL_FUNC
  35
  36 #ifndef IN_IDE_PARSER
  37 #define dbus_error_init (*pdbus_error_init)
  38 #define dbus_error_free (*pdbus_error_free)
  39 #define dbus_bus_get (*pdbus_bus_get)
  40 #define dbus_connection_set_exit_on_disconnect (*pdbus_connection_set_exit_on_disconnect)
  41 #define dbus_connection_unref (*pdbus_connection_unref)
  42 #define dbus_connection_send_with_reply_and_block (*pdbus_connection_send_with_reply_and_block)
  43 #define dbus_message_unref (*pdbus_message_unref)
  44 #define dbus_message_new_method_call (*pdbus_message_new_method_call)
  45 #define dbus_message_append_args (*pdbus_message_append_args)
  46 #define dbus_message_iter_init (*pdbus_message_iter_init)
  47 #define dbus_message_iter_next (*pdbus_message_iter_next)
  48 #define dbus_message_iter_recurse (*pdbus_message_iter_recurse)
  49 #define dbus_message_iter_get_arg_type (*pdbus_message_iter_get_arg_type)
  50 #define dbus_message_iter_get_basic (*pdbus_message_iter_get_basic)
  51 #define dbus_set_error_from_message (*pdbus_set_error_from_message)
  52 #endif
  53
  54 void PrepareDBus();
  55
  56 inline auto HasDBus()
  57 {
  58     static std::once_flag init_dbus{};
  59     std::call_once(init_dbus, []{ PrepareDBus(); });
  60     return dbus_handle;
  61 }
  62
  63 #else
  64
  65 constexpr bool HasDBus() noexcept { return true; }
  66 #endif /* HAVE_DYNLOAD */
  67
  68
  69 namespace dbus {
  70
  71 struct Error {
  72     Error() { dbus_error_init(&mError); }
  73     Error(const Error&) = delete;
  74     Error(Error&&) = delete;
  75     ~Error() { dbus_error_free(&mError); }
  76
  77     void operator=(const Error&) = delete;
  78     void operator=(Error&&) = delete;
  79
  80     DBusError* operator->() { return &mError; }
  81     DBusError &get() { return mError; }
  82
  83 private:
  84     DBusError mError{};
  85 };
  86
  87 struct ConnectionDeleter {
  88     void operator()(DBusConnection *c) { dbus_connection_unref(c); }
  89 };
  90 using ConnectionPtr = std::unique_ptr<DBusConnection,ConnectionDeleter>;
  91
  92 } // namespace dbus
  93
  94 #endif /* CORE_DBUS_WRAP_H */