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#pragma once
#include <forstio/id.hpp>
#include <forstio/async/async.hpp>
#include <forstio/codec/data.hpp>
#include <forstio/codec/interface.hpp>
#include <forstio/codec/schema_hash.hpp>
#include <variant>
#include "transfer.hpp"
namespace saw {
/**
* This class acts as a helper for rpc calls and representing data on the remote.
*/
template<typename T, typename Encoding>
class data_or_id {
private:
/**
* Variant representing the either id or data class.
*/
std::variant<id<T>, data<T,Encoding>> doi_;
public:
/**
* Constructor for instantiating.
*/
data_or_id(const id<T>& val):
doi_{val}
{}
/**
* Constructor for instantiating.
*/
data_or_id(data<T,Encoding> 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>>(doi_);
}
/**
* Returns the id.
*/
id<T> get_id() const {
return std::get<id<T>>(doi_);
}
/**
* Return a data reference.
*/
data<T,Encoding>& get_data(){
return std::get<data<T,Encoding>>(doi_);
}
/**
* Return a data reference.
*/
const data<T,Encoding>& get_data() const {
return std::get<data<T,Encoding>>(doi_);
}
};
/**
* Representing data on the remote
*/
template<typename T, typename Encoding, typename Remote>
class remote_data;
template<typename Iface, typename Encoding, typename Remote>
class rpc_client;
namespace impl {
template<typename T, typename Encoding, typename Remote>
struct tmpl_group_to_data_server_ptr_std_tuple;
template<typename... T, typename Encoding, typename Remote>
struct tmpl_group_to_data_server_ptr_std_tuple<tmpl_group<T...>, Encoding, Remote> {
using type = std::tuple<ptr<data_server<T,Encoding,Remote>>...>;
};
template<typename T, typename Encoding, typename Remote>
struct tmpl_group_to_data_client_std_tuple;
template<typename... T, typename Encoding, typename Remote>
struct tmpl_group_to_data_client_std_tuple<tmpl_group<T...>, Encoding, Remote> {
using type = std::tuple<data_client<T,Encoding,Remote>...>;
};
}
/**
* Identifier of an interface function on the wire.
*
* Keyed on the member name instead of the member index, so reordering an
* interface doesn't silently rebind calls between versions.
*/
template<string_literal Lit>
struct rpc_function_id {
static constexpr uint32_t value = hash_literal<Lit>::apply(0u);
};
namespace impl {
/**
* Translates a runtime function id back into the compile time member name
* of an interface.
*
* Needed by every backend where the called function arrives as data instead
* of as a template argument.
*/
template<typename Iface>
struct iface_dispatch {
static_assert(always_false<Iface>, "Expecting an Interface Type");
};
template<typename... T, string_literal... Names>
struct iface_dispatch<schema::Interface<schema::Member<T,Names>...>> {
template<typename Ret, uint64_t i, typename Func>
static Ret apply_ele(uint32_t func_id, Func& func){
if constexpr ( i < sizeof...(Names) ){
constexpr string_literal Lit = parameter_key_pack_type<i, Names...>::literal;
if(func_id == rpc_function_id<Lit>::value){
return func.template operator()<Lit>();
}
return apply_ele<Ret, i+1u>(func_id, func);
} else {
(void) func_id;
(void) func;
return make_error<err::not_found>("No interface member with this function id");
}
}
/**
* Calls func.operator()<Name>() for the member matching the id.
* The return type has to be provided, since there is no member to
* deduce it from if the id doesn't match anything.
*/
template<typename Ret, typename Func>
static Ret apply(uint32_t func_id, Func&& func){
return apply_ele<Ret, 0u>(func_id, func);
}
};
}
template<typename Remote>
class i_rpc_server {
protected:
virtual ~i_rpc_server() = default;
public:
virtual std::pair<uint32_t,uint32_t> get_class_id() const = 0;
template<typename To>
error_or<ptr<To>> cast_to(){
{
auto rhs = get_class_id();
if(To::class_id.first == rhs.first && To::class_id.second == rhs.second){
return {ptr<To>{*static_cast<To*>(this)}};
}
}
return make_error<err::invalid_state>("Class IDs are not matching.");
}
};
/**
* Implementation of a remote server on the backend
*/
template<typename Iface, typename Encoding, typename Remote>
class rpc_server {
private:
interface<Iface, Encoding> iface_;
public:
rpc_server(interface<Iface, Encoding> 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");
};
}
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