1 files changed, 169 insertions, 0 deletions
diff --git a/modules/codec/c++/rpc.hpp b/modules/codec/c++/rpc.hpp
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+++ b/modules/codec/c++/rpc.hpp
@@ -0,0 +1,169 @@
+#pragma once
+
+#include <forstio/id.hpp>
+#include <forstio/codec/data.hpp>
+#include <forstio/async/async.hpp>
+
+#include <forstio/codec/interface.hpp>
+
+#include <variant>
+
+namespace saw {
+
+/**
+ * This class acts as a helper for rpc calls and representing data on the remote.
+ */
+template<typename T, typename Encoding, typename Storage>
+class data_or_id {
+private:
+	/**
+	 * Variant representing the either id or data class.
+	 */
+	std::variant<id<T>, data<T,Encoding, Storage>> doi_;
+public:
+	/**
+	 * Constructor for instantiating.
+	 */
+	data_or_id(const id<T>& val):
+		doi_{val}
+	{}
+
+	/**
+	 * Constructor for instantiating.
+	 */
+	data_or_id(data<T,Encoding, Storage> val):
+		doi_{std::move(val)}
+	{}
+
+	/**
+	 * Check if this class holds an id.
+	 */
+	bool is_id() const {
+		return std::holds_alternative<id<T>>(doi_);
+	}
+
+	/**
+	 * Check if this class holds data.
+	 */
+	bool is_data() const {
+		return std::holds_alternative<data<T,Encoding,Storage>>(doi_);
+	}
+
+	/**
+	 * Returns the id.
+	 */
+	id<T> get_id() const {
+		return std::get<id<T>>(doi_);
+	}
+
+	/**
+	 * Return a data reference.
+	 */
+	data<T,Encoding, Storage>& get_data(){
+		return std::get<data<T,Encoding, Storage>>(doi_);
+	}
+
+	/**
+	 * Return a data reference.
+	 */
+	const data<T,Encoding,Storage>& get_data() const {
+		return std::get<data<T,Encoding,Storage>>(doi_);
+	}
+};
+
+/**
+ * Representing data on the remote
+ */
+template<typename T, typename Encoding, typename Storage, typename Remote>
+class remote_data {
+private:
+	id<T> id_;
+public:
+	remote_data(const id<T>& id):
+		id_{id}
+	{}
+
+	/**
+	 * Wait until data arrives
+	 */
+	error_or<data<T, Encoding, Storage>> wait(wait_scope& wait);
+
+	/**
+	 * Asynchronously wait for a result
+	 */
+	conveyor<data<T, Encoding, Storage>> on_receive();
+};
+
+/**
+ * Client RPC reference structure
+ */
+template<typename Iface, typename Encoding, typename Storage, typename Remote>
+class rpc_client {
+	/**
+	 * request the data from the remote
+	 */
+	template<typename IdT>
+	remote_data<IdT, Encoding, Storage, Remote> request_data(id<IdT> data);
+		
+	/** @todo
+	 * Determine type based on Name
+	 */
+	/*
+	template<string_literal Name>
+	error_or<
+		id<
+			typename schema_member_type<Name, Iface>::type
+		>
+	> call(data_or_id<Input> inp);
+	*/
+};
+
+/**
+ * Implementation of a remote server on the backend
+ */
+template<typename Iface, typename Encoding, typename Storage, typename Remote>
+class rpc_server {
+private:
+	interface<Iface, Encoding, Storage> iface_;
+public:
+	rpc_server(interface<Iface, Encoding, Storage> iface):
+		iface_{std::move(iface)}
+	{}
+};
+
+/**
+ * Representation of a remote.
+ * Partially similar to a network address
+ */
+template<typename Remote>
+class remote_address {
+	static_assert(always_false<Remote>, "Type of remote not supported");
+
+
+};
+
+/**
+ * Reference Backend structure
+ */
+template<typename Remote>
+class remote {
+	static_assert(always_false<Remote>, "Type of backend not supported");
+
+	/**
+	 * Resolves an address for the remote
+	 */
+	conveyor<remote_address<Remote>> resolve_address();
+
+	/**
+	 * Connect to a remote
+	 */
+	template<typename Iface, typename Encode, typename Storage>
+	conveyor<rpc_client<Iface, Encode, Storage, Remote>> connect(const remote_address<Remote>& addr);
+
+	/**
+	 * Start listening
+	 */
+	template<typename Iface, typename Encode, typename Storage>
+	rpc_server<Iface, Encode, Storage, Remote> listen();
+};
+}