1 files changed, 84 insertions, 0 deletions
diff --git a/source/lib/include/wanda/proto/message.hpp b/source/lib/include/wanda/proto/message.hpp
new file mode 100644
index 0000000..03a30c2
--- /dev/null
+++ b/source/lib/include/wanda/proto/message.hpp
@@ -0,0 +1,84 @@
+/**
+ * @file   message.hpp
+ * @author Felix Morgner (felix.morgner@gmail.com)
+ * @since  1.0.0
+ */
+
+#ifndef WANDA_PROTO_MESSAGE_HPP
+#define WANDA_PROTO_MESSAGE_HPP
+
+#include <spdlog/common.h>
+
+#include <cstddef>
+#include <istream>
+#include <optional>
+#include <string>
+#include <string_view>
+
+namespace wanda::proto
+{
+  /**
+   * @brief A tag to mark messages originating from the controller
+   */
+  auto constexpr message_source_controller = "C";
+
+  /**
+   * @brief A tag to mark messages originating from the daemon
+   */
+  auto constexpr message_source_daemon = "D";
+
+  /**
+   * @brief The command of the hello message
+   */
+  auto constexpr message_command_hello = "HELLO";
+
+  /**
+   * @brief A control protocol message, consisting of a @p source, @p command, and @p arguments
+   */
+  struct message
+  {
+    /**
+     * @brief Serialize this message into a string
+     */
+    explicit operator std::string() const;
+
+    /**
+     * @brief Get the size of the message as if it was serialized
+     */
+    std::size_t size() const;
+
+    /**
+     * @brief The source of the message
+     */
+    std::string source;
+
+    /**
+     * @brief The command of the message
+     */
+    std::string command;
+
+    /**
+     * @brief The arguments of the message command
+     */
+    std::optional<std::string> argument;
+  };
+
+  /**
+   * @brief Deserialize a message from the given stream
+   */
+  std::istream & operator>>(std::istream & in, message & message);
+
+  /**
+   * @brief Serialize a message to the given stream
+   */
+  std::ostream & operator<<(std::ostream & out, message const & message);
+
+}  // namespace wanda::proto
+
+template<>
+struct spdlog::fmt_lib::formatter<wanda::proto::message> : spdlog::fmt_lib::formatter<std::string>
+{
+  auto format(wanda::proto::message const & message, format_context & context) const -> decltype(context.out());
+};
+
+#endif
+\ No newline at end of file