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feat: Asio and
execution may now be used within the same applicatio…
…n. Simply link with `asio-grpc::asio-grpc(-standalone-asio)` and `asio-grpc::asio-grpc-(unifex|stdexec)`
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| Original file line number | Diff line number | Diff line change |
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| // Copyright 2023 Dennis Hezel | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
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| #ifndef AGRPC_DETAIL_ASIO_UTILS_HPP | ||
| #define AGRPC_DETAIL_ASIO_UTILS_HPP | ||
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| #include <agrpc/detail/config.hpp> | ||
| #include <agrpc/detail/execution.hpp> | ||
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| #if defined(AGRPC_STANDALONE_ASIO) || defined(AGRPC_BOOST_ASIO) | ||
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| AGRPC_NAMESPACE_BEGIN() | ||
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| namespace detail | ||
| { | ||
| template <class, class = void> | ||
| inline constexpr bool IS_EXECUTOR_PROVIDER = false; | ||
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| template <class T> | ||
| inline constexpr bool IS_EXECUTOR_PROVIDER<T, decltype((void)std::declval<T>().get_executor())> = true; | ||
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| #ifdef AGRPC_ASIO_HAS_SENDER_RECEIVER | ||
| template <class Executor, class Function> | ||
| void execute(Executor&& executor, Function&& function) | ||
| { | ||
| asio::execution::execute(static_cast<Executor&&>(executor), static_cast<Function&&>(function)); | ||
| } | ||
| #else | ||
| template <class Executor, class Function> | ||
| void execute(Executor&& executor, Function&& function) | ||
| { | ||
| static_cast<Executor&&>(executor).execute(static_cast<Function&&>(function)); | ||
| } | ||
| #endif | ||
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| template <class Executor, class Function, class Allocator> | ||
| void post_with_allocator(Executor&& executor, Function&& function, const Allocator& allocator) | ||
| { | ||
| detail::execute(asio::prefer(asio::require(static_cast<Executor&&>(executor), asio::execution::blocking_t::never), | ||
| asio::execution::relationship_t::fork, asio::execution::allocator(allocator)), | ||
| static_cast<Function&&>(function)); | ||
| } | ||
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| template <class CompletionHandler, class Function, class IOExecutor> | ||
| void complete_immediately(CompletionHandler&& completion_handler, Function&& function, const IOExecutor& io_executor) | ||
| { | ||
| const auto allocator = asio::get_associated_allocator(completion_handler); | ||
| #ifdef AGRPC_ASIO_HAS_IMMEDIATE_EXECUTOR | ||
| auto executor = asio::get_associated_immediate_executor( | ||
| completion_handler, | ||
| [&]() -> decltype(auto) | ||
| { | ||
| // Ensure that the io_executor is not already blocking::never because asio will try to convert const& to && | ||
| // due to chosing the `identity` overload of asio::require within the default_immediate_executor. | ||
| // https://github.com/chriskohlhoff/asio/issues/1392 | ||
| if constexpr (asio::traits::static_require<IOExecutor, asio::execution::blocking_t::never_t>::is_valid) | ||
| { | ||
| return asio::prefer(io_executor, asio::execution::blocking_t::possibly); | ||
| } | ||
| else | ||
| { | ||
| return (io_executor); | ||
| } | ||
| }()); | ||
| detail::execute( | ||
| asio::prefer(std::move(executor), asio::execution::allocator(allocator)), | ||
| [ch = static_cast<CompletionHandler&&>(completion_handler), f = static_cast<Function&&>(function)]() mutable | ||
| { | ||
| static_cast<Function&&>(f)(static_cast<CompletionHandler&&>(ch)); | ||
| }); | ||
| #else | ||
| auto executor = asio::get_associated_executor(completion_handler, io_executor); | ||
| detail::post_with_allocator( | ||
| std::move(executor), | ||
| [ch = static_cast<CompletionHandler&&>(completion_handler), f = static_cast<Function&&>(function)]() mutable | ||
| { | ||
| static_cast<Function&&>(f)(static_cast<CompletionHandler&&>(ch)); | ||
| }, | ||
| allocator); | ||
| #endif | ||
| } | ||
|
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| struct UncancellableToken | ||
| { | ||
| static constexpr bool is_connected() noexcept { return false; } | ||
| }; | ||
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| template <class Object> | ||
| auto get_cancellation_slot([[maybe_unused]] const Object& object) noexcept | ||
| { | ||
| #ifdef AGRPC_ASIO_HAS_CANCELLATION_SLOT | ||
| return asio::get_associated_cancellation_slot(object, UncancellableToken{}); | ||
| #else | ||
| return UncancellableToken{}; | ||
| #endif | ||
| } | ||
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| template <class T> | ||
| using CancellationSlotT = decltype(detail::get_cancellation_slot(std::declval<T>())); | ||
| } // namespace detail | ||
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| AGRPC_NAMESPACE_END | ||
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| #endif | ||
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| #endif // AGRPC_DETAIL_ASIO_UTILS_HPP |
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