131 lines
3.7 KiB
C++
131 lines
3.7 KiB
C++
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#ifndef GINVOKE_HPP
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#define GINVOKE_HPP
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#include <type_traits>
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#include <string>
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#include <string_view>
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#include <sstream>
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#include <iomanip>
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#include <utility>
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#include <optional>
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#include <variant>
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#include <iterator>
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#include <functional>
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#include <exception>
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#include <cstdint>
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#include <cinttypes>
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#include <cassert>
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#include <glib.h>
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#include "overload.hpp"
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#include "make_array.hpp"
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#include "hexify.hpp"
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namespace glib {
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namespace impl
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{
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using static_c_str = const char *;
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using varstring_t = std::variant<std::string, static_c_str>;
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struct varstring : varstring_t
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{
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const char* c_str() const && = delete;
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const char* c_str() const &
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{
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return std::visit(overload{
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[](const std::string &s){ return s.c_str(); },
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[](const static_c_str s){ return s; }
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}, static_cast<const varstring_t &>(*this));
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}
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};
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struct hresult
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{
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std::int32_t code;
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varstring message;
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};
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std::optional<hresult> get_if_hresult_error(std::exception_ptr) noexcept;
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}
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template<typename OStream, typename T>
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inline auto &describe_argument(OStream &s, const T &a) { return s << a; }
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template<typename OStream>
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inline auto &describe_argument(OStream &s, std::string_view const a) { return s << std::quoted(a); }
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template<typename OStream>
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inline auto &describe_argument(OStream &s, const std::string & a) { return s << std::quoted(a); }
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template<typename OStream>
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inline auto &describe_argument(OStream &s, const char * const a) { return s << std::quoted(a); }
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// TODO: overload for const GString *
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template<typename OStream>
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inline auto &describe_argument(OStream &s, std::wstring_view const a) { return s << std::quoted(a); }
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template<typename OStream>
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inline auto &describe_argument(OStream &s, const std::wstring & a) { return s << std::quoted(a); }
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template<typename OStream>
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inline auto &describe_argument(OStream &s, const wchar_t * const a) = delete; // not implemented
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// TODO: handle wide strings maybe
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template<typename... Arg>
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inline impl::varstring describe_arguments(const Arg &...a) noexcept try
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{
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std::ostringstream ss;
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((describe_argument(ss,a)<<','), ...);
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auto s = std::move(ss).str();
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s.pop_back();
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return {s};
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}
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catch (...)
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{
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return {"<failed to stringify>"};
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}
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#define FORMAT "%s(%s) failed: %s"
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template<typename... Arg>
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inline void log_invocation_failure(const char *e, const char *func_name, const Arg &...a) noexcept
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{
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const auto args = describe_arguments(a...);
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g_warning(FORMAT, func_name, args.c_str(), e);
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}
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template<typename... Arg>
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inline void log_invocation_failure_desc(const char* e, const char* e_desc, const char* func_name, const Arg&... a) noexcept
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{
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const auto args = describe_arguments(a...);
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g_warning(FORMAT": %s", func_name, args.c_str(), e, e_desc);
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}
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#undef FORMAT
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template<typename Invokable, typename... Arg>
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inline gboolean try_invoke(const char *func_name, Invokable &&i, const Arg &...a) noexcept try
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{
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return std::invoke(std::forward<Invokable>(i), a...);
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}
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catch (const std::exception &e)
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{
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log_invocation_failure(e.what(), func_name, a...);
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return FALSE;
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}
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catch (...)
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{
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if (const auto e = impl::get_if_hresult_error(std::current_exception()))
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{
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auto hr = make_array("hresult 0x01234567\0");
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hexify32(static_cast<std::uint32_t>(e->code), std::end(hr)-1);
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log_invocation_failure_desc(std::begin(hr), e->message.c_str(), func_name, a...);
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}
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else
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log_invocation_failure("unknown error", func_name, a...);
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return FALSE;
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}
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} // namespace glib
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#define g_try_invoke(invokable, ...) glib::try_invoke(#invokable, invokable, __VA_ARGS__)
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#endif
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