From 44f6a2ec37e35cf96419885be27afeab9ea84ec5 Mon Sep 17 00:00:00 2001
From: Claudius 'keldu' Holeksa <mail@keldu.de>
Date: Mon, 29 Jul 2024 14:53:48 +0200
Subject: wip

---
 modules/codec/c++/data.hpp                  |  4 +-
 modules/codec/c++/schema_hash.hpp           | 27 ++++++++++++-
 modules/core/c++/templates.hpp              |  4 +-
 modules/remote/c++/remote_loopback.hpp      | 34 ----------------
 modules/remote/c++/remote_loopback_base.hpp | 63 +++++++++++++++++++++++++++++
 modules/remote/c++/transfer.hpp             |  6 ++-
 modules/remote/c++/transfer_loopback.hpp    | 19 +++++++--
 7 files changed, 116 insertions(+), 41 deletions(-)

diff --git a/modules/codec/c++/data.hpp b/modules/codec/c++/data.hpp
index a17f123..8e92622 100644
--- a/modules/codec/c++/data.hpp
+++ b/modules/codec/c++/data.hpp
@@ -21,7 +21,9 @@ struct Default {};
 }
 
 namespace encode {
-struct Native {};
+struct Native {
+	static constexpr string_literal name = "encode::Native";
+};
 }
 template<typename Schema, typename Encode, typename Storage = storage::Default>
 class codec;
diff --git a/modules/codec/c++/schema_hash.hpp b/modules/codec/c++/schema_hash.hpp
index 4b537e1..d653bf4 100644
--- a/modules/codec/c++/schema_hash.hpp
+++ b/modules/codec/c++/schema_hash.hpp
@@ -15,7 +15,9 @@ struct hash_literal {
 
 template<typename Schema>
 struct schema_hash_seed {
-		static_assert(always_false<Schema>, "Not schema_hashable");
+	static constexpr uint32_t apply(uint32_t seed){
+		return hash_literal<Schema::name>::apply(seed);
+	}
 };
 
 template<>
@@ -125,6 +127,29 @@ struct schema_hash_seed<schema::Tuple<T...>> {
 	}
 };
 
+template<typename... T>
+struct schema_hash_seed<tmpl_group<T...>> {
+	template<uint64_t i>
+	static constexpr uint32_t apply_ele(uint32_t seed){
+		using Type = typename parameter_pack_type<i,T...>::type;
+
+		seed = schema_hash_seed<Type>::apply(seed);
+		if constexpr ( (i+1u) < sizeof...(T) ){
+			return apply_ele<i+1u>(seed);
+		}
+
+		return seed;
+	}
+
+	static constexpr uint32_t apply(uint32_t seed){
+		seed = hash_literal<tmpl_group<T...>::name>::apply(seed);
+		if constexpr (sizeof...(T)>0u){
+			seed = apply_ele<0u>(seed);
+		}
+		return seed;
+	}
+};
+
 template<typename V, string_literal K>
 struct schema_hash_seed<schema::Member<V,K>> {
 	using Schema = schema::Member<V,K>;
diff --git a/modules/core/c++/templates.hpp b/modules/core/c++/templates.hpp
index 70836ae..9f629da 100644
--- a/modules/core/c++/templates.hpp
+++ b/modules/core/c++/templates.hpp
@@ -9,7 +9,9 @@ namespace saw {
  * This type is meant for grouping of template types
  */
 template <class... T>
-struct tmpl_group {};
+struct tmpl_group {
+	static constexpr string_literal name = "tmpl_group";
+};
 
 template<typename T, typename U>
 struct tmpl_concat;
diff --git a/modules/remote/c++/remote_loopback.hpp b/modules/remote/c++/remote_loopback.hpp
index ea4eb8e..400a076 100644
--- a/modules/remote/c++/remote_loopback.hpp
+++ b/modules/remote/c++/remote_loopback.hpp
@@ -83,38 +83,4 @@ public:
 	// error_or<id<>>
 };
 
-template<>
-class remote<rmt::Loopback> {
-private:
-	std::map<uint64_t, i_data_server<>> registered_data_servers_;
-public:
-	/**
-	 * Resolves an address for the remote
-	 */
-	error_or<own<remote_address<rmt::Loopback>>> parse_address(data<schema::UInt64> id){
-		return heap<remote_address<rmt::Loopback>>(id);
-	}
-
-	/**
-	 * Connect to a remote
-	 */
-	template<typename Iface, typename Encode, typename Storage>
-	conveyor<rpc_client<Iface, Encode, Storage, rmt::Loopback>> connect(const remote_address<rmt::Loopback>& addr);
-
-	/**
-	 * Start listening
-	 */
-	template<typename Iface, typename Encode, typename Storage>
-	rpc_server<Iface, Encode, Storage, rmt::Loopback> listen(const remote_address<rmt::Loopback>& addr, typename rpc_server<Iface,Encode,Storage,rmt::Loopback>::InterfaceT iface){
-		return {addr, std::move(iface)};
-	}
-
-	/**
-	 * Start data server
-	 */
-	template<typename Encode>
-	data_server<Encode> data_listen(const remote_address<rmt::Loopback>& addr){
-		return {addr,*this};
-	}
-};
 }
diff --git a/modules/remote/c++/remote_loopback_base.hpp b/modules/remote/c++/remote_loopback_base.hpp
index 823c516..660180d 100644
--- a/modules/remote/c++/remote_loopback_base.hpp
+++ b/modules/remote/c++/remote_loopback_base.hpp
@@ -1,7 +1,70 @@
 #pragma once
 
+#include "remote.hpp"
+
+#include <map>
+
 namespace saw {
 namespace rmt {
 struct Loopback {};
 }
+
+template<>
+class remote<rmt::Loopback> {
+private:
+	std::map<uint64_t, ptr<i_data_server<rmt::Loopback>>> registered_data_servers_;
+public:
+	/**
+	 * Resolves an address for the remote
+	 */
+	error_or<own<remote_address<rmt::Loopback>>> parse_address(data<schema::UInt64> id){
+		return heap<remote_address<rmt::Loopback>>(id);
+	}
+
+	/**
+	 * Connect to a remote
+	 */
+	template<typename Iface, typename Encode, typename Storage>
+	conveyor<rpc_client<Iface, Encode, Storage, rmt::Loopback>> connect(const remote_address<rmt::Loopback>& addr);
+
+	/**
+	 * Start listening
+	 */
+	template<typename Iface, typename Encode, typename Storage>
+	rpc_server<Iface, Encode, Storage, rmt::Loopback> listen(const remote_address<rmt::Loopback>& addr, typename rpc_server<Iface,Encode,Storage,rmt::Loopback>::InterfaceT iface){
+		return {addr, std::move(iface)};
+	}
+
+	/**
+	 * Start data server
+	 */
+	template<typename Schema, typename Encode>
+	error_or<own<data_server<Schema, Encode, rmt::Loopback>>> data_listen(const remote_address<rmt::Loopback>& addr){
+		auto find = registered_data_servers_.find(addr.get_address_id());
+		if(find == registered_data_servers_.end()){
+			return make_error<err::already_exists>("Server already bound to this address");
+		}
+		return {addr,*this};
+	}
+
+	/**
+	 * Connect to a data server
+	 */
+	template<typename Schema, typename Encode>
+	conveyor<data_client<Schema, Encode, rmt::Loopback>> data_connect(const remote_address<rmt::Loopback>& addr){
+		
+	}
+
+	/**
+	 * Internal function
+	 */
+	error_or<void> register_data_server(const remote_address<rmt::Loopback>& addr, i_data_server<rmt::Loopback>& srv){
+
+		auto insert = registered_data_servers_.emplace(std::make_pair(addr.get_address_id(), {srv}));
+		if(insert.second){
+			return make_error<err::already_exists>("Server already bound to this address");
+		}
+
+	}
+};
 }
diff --git a/modules/remote/c++/transfer.hpp b/modules/remote/c++/transfer.hpp
index ea61d56..32416de 100644
--- a/modules/remote/c++/transfer.hpp
+++ b/modules/remote/c++/transfer.hpp
@@ -1,10 +1,14 @@
 #pragma once
 
+#include <map>
+
 namespace saw {
 template<typename Remote>
 class i_data_server {
 protected:
-	virtual ~i_data_server() = default;
+	~i_data_server() = default;
+public:
+	virtual std::pair<uint32_t,uint32_t> get_class_id() const = 0;
 };
 
 template<typename Schema, typename Encoding, typename Remote>
diff --git a/modules/remote/c++/transfer_loopback.hpp b/modules/remote/c++/transfer_loopback.hpp
index 2e01509..d205776 100644
--- a/modules/remote/c++/transfer_loopback.hpp
+++ b/modules/remote/c++/transfer_loopback.hpp
@@ -9,24 +9,37 @@ namespace rmt {
 struct Loopback {};
 }
 
+template<>
+class remote<rmt::Loopback>;
+
 template<typename... Schema, typename Encoding>
-class data_server<tmpl_group<Schema...>, Encoding, rmt::Loopback> {
+class data_server<tmpl_group<Schema...>, Encoding, rmt::Loopback> final : public i_data_server<rmt::Loopback> {
 private:
 	typename impl::data_server_redux<Encoding, storage::Default, typename tmpl_reduce<tmpl_group<Schema...>>::type>::type values_;
 
 	ptr<remote<rmt::Loopback>> remote_;
 public:
 	data_server(remote_address<rmt::Loopback>& addr){
-		remote->register_server(addr);
+		remote_().register_server(addr);
 	}
 
 	~data_server(){
-		remote->deregister_server(addr);
+		remote_().deregister_server(addr);
 	}
 
 	SAW_FORBID_COPY(data_server);
 	SAW_FORBID_MOVE(data_server);
 
+	/**
+	 * Return the schema id
+	 */
+	std::pair<uint32_t,uint32_t> get_class_id() const override {
+		uint32_t schema_hash = schema_hash<tmpl_group<Schema...>>::apply();
+		uint32_t encode_hash = schema_hash<Encoding>::apply();
+
+		return std::make_pair(schema_hash, encode_hash);
+	}
+
 	/**
 	 * Get data from client
 	 */
-- 
cgit v1.2.3