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#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();
};
}
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