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#pragma once
#include "baserule.hpp"
#include "ruleparametertraits.hpp"
#include "websocket.hpp"
#include <boost/beast/http/verb.hpp>
#include <functional>
#include <limits>
#include <string>
#include <type_traits>
namespace crow
{
namespace detail
{
namespace routing_handler_call_helper
{
template <typename T, int Pos>
struct CallPair
{
using type = T;
static const int pos = Pos;
};
template <typename H1>
struct CallParams
{
H1& handler;
const std::vector<std::string>& params;
const Request& req;
const std::shared_ptr<bmcweb::AsyncResp>& asyncResp;
};
template <typename F, int NString, typename S1, typename S2>
struct Call
{};
template <typename F, int NString, typename... Args1, typename... Args2>
struct Call<F, NString, black_magic::S<std::string, Args1...>,
black_magic::S<Args2...>>
{
void operator()(F cparams)
{
using pushed = typename black_magic::S<Args2...>::template push_back<
CallPair<std::string, NString>>;
Call<F, NString + 1, black_magic::S<Args1...>, pushed>()(cparams);
}
};
template <typename F, int NString, typename... Args1>
struct Call<F, NString, black_magic::S<>, black_magic::S<Args1...>>
{
void operator()(F cparams)
{
cparams.handler(cparams.req, cparams.asyncResp,
cparams.params[Args1::pos]...);
}
};
template <typename Func, typename... ArgsWrapped>
struct Wrapped
{
template <typename... Args>
void set(
Func f,
typename std::enable_if<
!std::is_same<
typename std::tuple_element<0, std::tuple<Args..., void>>::type,
const Request&>::value,
int>::type /*enable*/
= 0)
{
handler = [f = std::forward<Func>(f)](
const Request&,
const std::shared_ptr<bmcweb::AsyncResp>& asyncResp,
Args... args) { asyncResp->res.result(f(args...)); };
}
template <typename Req, typename... Args>
struct ReqHandlerWrapper
{
explicit ReqHandlerWrapper(Func fIn) : f(std::move(fIn)) {}
void operator()(const Request& req,
const std::shared_ptr<bmcweb::AsyncResp>& asyncResp,
Args... args)
{
asyncResp->res.result(f(req, args...));
}
Func f;
};
template <typename... Args>
void set(
Func f,
typename std::enable_if<
std::is_same<
typename std::tuple_element<0, std::tuple<Args..., void>>::type,
const Request&>::value &&
!std::is_same<typename std::tuple_element<
1, std::tuple<Args..., void, void>>::type,
const std::shared_ptr<bmcweb::AsyncResp>&>::value,
int>::type /*enable*/
= 0)
{
handler = ReqHandlerWrapper<Args...>(std::move(f));
/*handler = (
[f = std::move(f)]
(const Request& req, Response& res, Args... args){
res.result(f(req, args...));
res.end();
});*/
}
template <typename... Args>
void set(
Func f,
typename std::enable_if<
std::is_same<
typename std::tuple_element<0, std::tuple<Args..., void>>::type,
const Request&>::value &&
std::is_same<typename std::tuple_element<
1, std::tuple<Args..., void, void>>::type,
const std::shared_ptr<bmcweb::AsyncResp>&>::value,
int>::type /*enable*/
= 0)
{
handler = std::move(f);
}
template <typename... Args>
struct HandlerTypeHelper
{
using type = std::function<void(
const crow::Request& /*req*/,
const std::shared_ptr<bmcweb::AsyncResp>&, Args...)>;
using args_type = black_magic::S<Args...>;
};
template <typename... Args>
struct HandlerTypeHelper<const Request&, Args...>
{
using type = std::function<void(
const crow::Request& /*req*/,
const std::shared_ptr<bmcweb::AsyncResp>&, Args...)>;
using args_type = black_magic::S<Args...>;
};
template <typename... Args>
struct HandlerTypeHelper<const Request&,
const std::shared_ptr<bmcweb::AsyncResp>&, Args...>
{
using type = std::function<void(
const crow::Request& /*req*/,
const std::shared_ptr<bmcweb::AsyncResp>&, Args...)>;
using args_type = black_magic::S<Args...>;
};
typename HandlerTypeHelper<ArgsWrapped...>::type handler;
void operator()(const Request& req,
const std::shared_ptr<bmcweb::AsyncResp>& asyncResp,
const std::vector<std::string>& params)
{
detail::routing_handler_call_helper::Call<
detail::routing_handler_call_helper::CallParams<decltype(handler)>,
0, typename HandlerTypeHelper<ArgsWrapped...>::args_type,
black_magic::S<>>()(
detail::routing_handler_call_helper::CallParams<decltype(handler)>{
handler, params, req, asyncResp});
}
};
} // namespace routing_handler_call_helper
} // namespace detail
class DynamicRule : public BaseRule, public RuleParameterTraits<DynamicRule>
{
public:
explicit DynamicRule(const std::string& ruleIn) : BaseRule(ruleIn) {}
void validate() override
{
if (!erasedHandler)
{
throw std::runtime_error("no handler for url " + rule);
}
}
void handle(const Request& req,
const std::shared_ptr<bmcweb::AsyncResp>& asyncResp,
const std::vector<std::string>& params) override
{
erasedHandler(req, asyncResp, params);
}
template <typename Func>
void operator()(Func f)
{
using boost::callable_traits::args_t;
constexpr size_t arity = std::tuple_size<args_t<Func>>::value;
constexpr auto is = std::make_integer_sequence<unsigned, arity>{};
erasedHandler = wrap(std::move(f), is);
}
// enable_if Arg1 == request && Arg2 == Response
// enable_if Arg1 == request && Arg2 != response
// enable_if Arg1 != request
template <typename Func, unsigned... Indices>
std::function<void(const Request&,
const std::shared_ptr<bmcweb::AsyncResp>&,
const std::vector<std::string>&)>
wrap(Func f, std::integer_sequence<unsigned, Indices...> /*is*/)
{
using function_t = crow::utility::FunctionTraits<Func>;
auto ret = detail::routing_handler_call_helper::Wrapped<
Func, typename function_t::template arg<Indices>...>();
ret.template set<typename function_t::template arg<Indices>...>(
std::move(f));
return ret;
}
private:
std::function<void(const Request&,
const std::shared_ptr<bmcweb::AsyncResp>&,
const std::vector<std::string>&)>
erasedHandler;
};
} // namespace crow
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