mirror of
https://github.com/XRPLF/clio.git
synced 2025-11-04 03:45:50 +00:00
chore: Cancellable coroutines (#2180)
Add a wrap for `boost::asio::yield_context` to make async operations cancellable by default. The API could be a bit adjusted when we start switching our code to use it.
This commit is contained in:
Sergey Kuznetsov
@@ -4,6 +4,7 @@ target_sources(
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clio_util
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PRIVATE Assert.cpp
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build/Build.cpp
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Coroutine.cpp
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CoroutineGroup.cpp
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log/Logger.cpp
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prometheus/Http.cpp
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90
src/util/Coroutine.cpp
Normal file
90
src/util/Coroutine.cpp
Normal file
@@ -0,0 +1,90 @@
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//------------------------------------------------------------------------------
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/*
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This file is part of clio: https://github.com/XRPLF/clio
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Copyright (c) 2025, the clio developers.
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Permission to use, copy, modify, and distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
|
||||
copyright notice and this permission notice appear in all copies.
|
||||
|
||||
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
||||
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#include "util/Coroutine.hpp"
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#include <boost/asio/any_io_executor.hpp>
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#include <boost/asio/bind_cancellation_slot.hpp>
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#include <boost/asio/cancellation_type.hpp>
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#include <boost/asio/error.hpp>
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#include <boost/asio/post.hpp>
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#include <boost/asio/spawn.hpp>
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#include <cstddef>
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#include <memory>
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#include <utility>
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namespace util {
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Coroutine::Coroutine(boost::asio::yield_context&& yield, std::shared_ptr<FamilyCancellationSignal> signal)
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: yield_(std::move(yield))
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, cyield_(boost::asio::bind_cancellation_slot(cancellationSignal_.slot(), yield_[error_]))
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, familySignal_{std::move(signal)}
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, connection_{familySignal_->connect([this](boost::asio::cancellation_type_t cancellationType) {
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cancellationSignal_.emit(cancellationType);
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isCancelled_ = true;
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})}
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{
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}
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Coroutine::~Coroutine()
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{
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connection_.disconnect();
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}
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boost::system::error_code
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Coroutine::error() const
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{
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return error_;
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}
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void
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Coroutine::cancelAll(boost::asio::cancellation_type_t cancellationType)
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{
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if (isCancelled())
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return;
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familySignal_->operator()(cancellationType);
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}
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bool
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Coroutine::isCancelled() const
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{
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return error_ == boost::asio::error::operation_aborted || isCancelled_;
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}
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Coroutine::cancellable_yield_context_type
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Coroutine::yieldContext() const
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{
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return cyield_;
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}
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boost::asio::any_io_executor
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Coroutine::executor() const
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{
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return cyield_.get().get_executor();
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}
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void
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Coroutine::yield() const
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{
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boost::asio::post(yield_);
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}
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} // namespace util
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191
src/util/Coroutine.hpp
Normal file
191
src/util/Coroutine.hpp
Normal file
@@ -0,0 +1,191 @@
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//------------------------------------------------------------------------------
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/*
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This file is part of clio: https://github.com/XRPLF/clio
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Copyright (c) 2025, the clio developers.
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Permission to use, copy, modify, and distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
|
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copyright notice and this permission notice appear in all copies.
|
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|
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#pragma once
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#include <boost/asio/any_io_executor.hpp>
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#include <boost/asio/bind_cancellation_slot.hpp>
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#include <boost/asio/cancellation_signal.hpp>
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#include <boost/asio/cancellation_type.hpp>
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#include <boost/asio/error.hpp>
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#include <boost/asio/spawn.hpp>
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#include <boost/signals2/connection.hpp>
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#include <boost/signals2/signal.hpp>
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#include <boost/signals2/variadic_signal.hpp>
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#include <atomic>
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#include <concepts>
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#include <csignal>
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#include <cstddef>
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#include <memory>
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#include <utility>
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namespace util {
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class Coroutine;
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/**
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* @brief Concept for functions that can be used as coroutine bodies.
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* Such functions must be invocable with a `Coroutine&` argument.
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* @tparam Fn The function type to check.
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*/
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template <typename Fn>
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concept CoroutineFunction = std::invocable<Fn, Coroutine&> and not std::is_reference_v<Fn>;
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/**
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* @brief Manages a coroutine execution context, allowing for cooperative multitasking
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* and cancellation.
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*
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* The Coroutine class wraps a Boost.Asio yield_context and provides mechanisms
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* for spawning new coroutines, child coroutines, and managing their lifecycle,
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* including cancellation. It integrates with a signal system to propagate
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* cancellation requests across related coroutines.
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*/
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class Coroutine {
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public:
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/**
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* @brief Type alias for a yield_context that is bound to a cancellation slot.
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* This allows asynchronous operations initiated with this context to be cancelled.
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*/
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using cancellable_yield_context_type =
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boost::asio::cancellation_slot_binder<boost::asio::yield_context, boost::asio::cancellation_slot>;
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private:
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boost::asio::yield_context yield_;
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boost::system::error_code error_;
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boost::asio::cancellation_signal cancellationSignal_;
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cancellable_yield_context_type cyield_;
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std::atomic_bool isCancelled_{false};
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using FamilyCancellationSignal = boost::signals2::signal<void(boost::asio::cancellation_type_t)>;
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std::shared_ptr<FamilyCancellationSignal> familySignal_;
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boost::signals2::connection connection_;
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/**
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* @brief Private constructor to create a Coroutine instance.
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* @param yield The Boost.Asio yield_context for this coroutine.
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* @param signal A shared signal used for propagating cancellation requests among related coroutines.
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*/
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explicit Coroutine(
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boost::asio::yield_context&& yield,
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std::shared_ptr<FamilyCancellationSignal> signal = std::make_shared<FamilyCancellationSignal>()
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);
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public:
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/**
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* @brief Destructor for the Coroutine.
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* Handles cleanup, such as disconnecting from the cancellation signal.
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*/
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~Coroutine();
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Coroutine(Coroutine const&) = delete;
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Coroutine(Coroutine&&) = delete;
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Coroutine&
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operator==(Coroutine&&) = delete;
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Coroutine&
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operator==(Coroutine const&) = delete;
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/**
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* @brief Spawns a new top-level coroutine.
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* @tparam ExecutionContext The type of the I/O execution context (e.g., boost::asio::io_context).
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* @tparam Fn The type of the invocable function that represents the coroutine body.
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* @param ioContext The I/O execution context on which to spawn the coroutine.
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* @param fn The function to be executed as the coroutine. It will receive a Coroutine& argument.
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*/
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template <typename ExecutionContext, CoroutineFunction Fn>
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static void
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spawnNew(ExecutionContext& ioContext, Fn fn)
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{
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boost::asio::spawn(ioContext, [fn = std::move(fn)](boost::asio::yield_context yield) {
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Coroutine thisCoroutine{std::move(yield)};
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fn(thisCoroutine);
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});
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}
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/**
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* @brief Spawns a child coroutine from this coroutine.
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* The child coroutine shares the same cancellation signal.
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* @tparam Fn The type of the invocable function that represents the child coroutine body.
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* @param fn The function to be executed as the child coroutine. It will receive a Coroutine& argument.
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*/
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template <CoroutineFunction Fn>
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void
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spawnChild(Fn fn)
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{
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if (isCancelled_)
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return;
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boost::asio::spawn(
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yield_,
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[signal = familySignal_, fn = std::move(fn)](boost::asio::yield_context yield) mutable {
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Coroutine coroutine(std::move(yield), std::move(signal));
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fn(coroutine);
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}
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);
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}
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/**
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* @brief Returns the error code, if any, associated with the last operation in this coroutine.
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* @return A boost::system::error_code indicating the status.
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*/
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[[nodiscard]] boost::system::error_code
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error() const;
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/**
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* @brief Cancels all coroutines sharing the same root cancellation signal.
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* @param cancellationType The type of cancellation to perform.
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* Defaults to boost::asio::cancellation_type::terminal.
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*/
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void
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cancelAll(boost::asio::cancellation_type_t cancellationType = boost::asio::cancellation_type::terminal);
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/**
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* @brief Checks if this coroutine has been cancelled.
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* @return True if the coroutine is cancelled, false otherwise.
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*/
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[[nodiscard]] bool
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isCancelled() const;
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/**
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* @brief Returns the cancellable yield context associated with this coroutine.
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* This context should be used for Boost.Asio asynchronous operations within the coroutine
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* to enable cancellation.
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* @return A cancellable_yield_context_type object.
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*/
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[[nodiscard]] cancellable_yield_context_type
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yieldContext() const;
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/**
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* @brief Returns the executor associated with this coroutine's yield context.
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* @return The executor.
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*/
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[[nodiscard]] boost::asio::any_io_executor
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executor() const;
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/**
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* @brief Explicitly yields execution back to the scheduler.
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* This can be used to allow other tasks to run.
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*/
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void
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yield() const;
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};
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} // namespace util
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@@ -19,6 +19,7 @@
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#pragma once
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#include "util/Coroutine.hpp"
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#include "util/LoggerFixtures.hpp"
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#include <boost/asio/executor_work_guard.hpp>
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@@ -79,6 +80,22 @@ private:
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* This is meant to be used as a base for other fixtures.
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*/
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struct SyncAsioContextTest : virtual public NoLoggerFixture {
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template <util::CoroutineFunction F>
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void
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runCoroutine(F&& f, bool allowMockLeak = false)
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{
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testing::MockFunction<void()> call;
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if (allowMockLeak)
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testing::Mock::AllowLeak(&call);
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util::Coroutine::spawnNew(ctx_, [&, _ = boost::asio::make_work_guard(ctx_)](util::Coroutine& coroutine) {
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f(coroutine);
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call.Call();
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});
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EXPECT_CALL(call, Call());
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runContext();
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}
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template <typename F>
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void
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runSpawn(F&& f, bool allowMockLeak = false)
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@@ -166,6 +166,7 @@ target_sources(
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# Common utils
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util/AccountUtilsTests.cpp
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util/AssertTests.cpp
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util/CoroutineTest.cpp
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util/MoveTrackerTests.cpp
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util/RandomTests.cpp
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util/RetryTests.cpp
|
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|
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191
tests/unit/util/CoroutineTest.cpp
Normal file
191
tests/unit/util/CoroutineTest.cpp
Normal file
@@ -0,0 +1,191 @@
|
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//------------------------------------------------------------------------------
|
||||
/*
|
||||
This file is part of clio: https://github.com/XRPLF/clio
|
||||
Copyright (c) 2025, the clio developers.
|
||||
|
||||
Permission to use, copy, modify, and distribute this software for any
|
||||
purpose with or without fee is hereby granted, provided that the above
|
||||
copyright notice and this permission notice appear in all copies.
|
||||
|
||||
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
||||
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
||||
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
||||
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
||||
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
||||
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
||||
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
||||
*/
|
||||
//==============================================================================
|
||||
|
||||
#include "util/AsioContextTestFixture.hpp"
|
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#include "util/Coroutine.hpp"
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#include "util/Profiler.hpp"
|
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|
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#include <boost/asio/buffer.hpp>
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#include <boost/asio/error.hpp>
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#include <boost/asio/ip/tcp.hpp>
|
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#include <boost/asio/post.hpp>
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#include <boost/asio/read.hpp>
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#include <boost/asio/steady_timer.hpp>
|
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#include <boost/system/error_code.hpp>
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#include <boost/system/system_error.hpp>
|
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#include <gmock/gmock.h>
|
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#include <gtest/gtest.h>
|
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|
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#include <chrono>
|
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#include <ranges>
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#include <string>
|
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|
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using namespace util;
|
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|
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class CoroutineTest : public SyncAsioContextTest {
|
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protected:
|
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testing::StrictMock<testing::MockFunction<void(Coroutine&)>> fnMock_;
|
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|
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static void
|
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asyncOperation(Coroutine::cancellable_yield_context_type yield, std::chrono::steady_clock::duration duration)
|
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{
|
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boost::asio::steady_timer timer(yield.get().get_executor(), duration);
|
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timer.async_wait(yield);
|
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}
|
||||
};
|
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|
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TEST_F(CoroutineTest, SpawnNew)
|
||||
{
|
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EXPECT_CALL(fnMock_, Call);
|
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|
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Coroutine::spawnNew(ctx_, fnMock_.AsStdFunction());
|
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ctx_.run();
|
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}
|
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|
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TEST_F(CoroutineTest, SpawnChild)
|
||||
{
|
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EXPECT_CALL(fnMock_, Call);
|
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runCoroutine([this](Coroutine& coroutine) { coroutine.spawnChild(fnMock_.AsStdFunction()); });
|
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}
|
||||
|
||||
TEST_F(CoroutineTest, SpawnChildDoesNothingWhenTheCoroutineIsCancelled)
|
||||
{
|
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runCoroutine([this](Coroutine& coroutine) {
|
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coroutine.cancelAll();
|
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coroutine.spawnChild(fnMock_.AsStdFunction());
|
||||
});
|
||||
}
|
||||
|
||||
TEST_F(CoroutineTest, ErrorReturnsDefaultWhenNoError)
|
||||
{
|
||||
runCoroutine([](Coroutine& coroutine) { EXPECT_EQ(coroutine.error(), boost::system::error_code{}); });
|
||||
}
|
||||
|
||||
TEST_F(CoroutineTest, ErrorReturnsDefaultAfterSuccessfulOperation)
|
||||
{
|
||||
runCoroutine([](Coroutine& coroutine) {
|
||||
boost::asio::steady_timer timer(coroutine.executor());
|
||||
timer.expires_after(std::chrono::milliseconds(1));
|
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timer.async_wait(coroutine.yieldContext());
|
||||
EXPECT_EQ(coroutine.error(), boost::system::error_code{});
|
||||
});
|
||||
}
|
||||
|
||||
TEST_F(CoroutineTest, ErrorReturnsErrorOfLastOperation)
|
||||
{
|
||||
runCoroutine([](Coroutine& coroutine) {
|
||||
boost::asio::ip::tcp::socket socket{coroutine.executor()};
|
||||
std::string buffer;
|
||||
socket.async_read_some(boost::asio::buffer(buffer), coroutine.yieldContext());
|
||||
EXPECT_EQ(coroutine.error(), boost::system::errc::bad_file_descriptor);
|
||||
});
|
||||
}
|
||||
|
||||
TEST_F(CoroutineTest, CancelAllCancelsChildren)
|
||||
{
|
||||
runCoroutine([&](Coroutine& coroutine) {
|
||||
coroutine.spawnChild([](Coroutine& childCoroutine) {
|
||||
auto const duration = util::timed([&childCoroutine]() {
|
||||
asyncOperation(childCoroutine.yieldContext(), std::chrono::seconds{5});
|
||||
});
|
||||
EXPECT_TRUE(childCoroutine.isCancelled());
|
||||
EXPECT_LT(duration, 1000);
|
||||
});
|
||||
coroutine.cancelAll();
|
||||
EXPECT_TRUE(coroutine.isCancelled());
|
||||
});
|
||||
}
|
||||
|
||||
TEST_F(CoroutineTest, CancelAllCancelsParent)
|
||||
{
|
||||
runCoroutine([&](Coroutine& coroutine) {
|
||||
coroutine.spawnChild([](Coroutine& childCoroutine) {
|
||||
childCoroutine.yield();
|
||||
childCoroutine.cancelAll();
|
||||
EXPECT_TRUE(childCoroutine.isCancelled());
|
||||
});
|
||||
|
||||
auto const duration =
|
||||
util::timed([&coroutine]() { asyncOperation(coroutine.yieldContext(), std::chrono::seconds{5}); });
|
||||
EXPECT_TRUE(coroutine.isCancelled());
|
||||
EXPECT_LT(duration, 1000);
|
||||
});
|
||||
}
|
||||
|
||||
TEST_F(CoroutineTest, CancelAllCalledMultipleTimes)
|
||||
{
|
||||
runCoroutine([&](Coroutine& coroutine) {
|
||||
coroutine.spawnChild([](Coroutine& childCoroutine) {
|
||||
childCoroutine.yield();
|
||||
for ([[maybe_unused]] auto const i : std::ranges::iota_view(0, 10)) {
|
||||
childCoroutine.cancelAll();
|
||||
}
|
||||
EXPECT_TRUE(childCoroutine.isCancelled());
|
||||
});
|
||||
|
||||
auto const duration =
|
||||
util::timed([&coroutine]() { asyncOperation(coroutine.yieldContext(), std::chrono::seconds{5}); });
|
||||
EXPECT_TRUE(coroutine.isCancelled());
|
||||
EXPECT_LT(duration, 1000);
|
||||
});
|
||||
}
|
||||
|
||||
TEST_F(CoroutineTest, CancelAllCancelsSiblingsAndParent)
|
||||
{
|
||||
EXPECT_CALL(fnMock_, Call).Times(2);
|
||||
runCoroutine([&](Coroutine& parentCoroutine) {
|
||||
parentCoroutine.spawnChild([&](Coroutine& child1Coroutine) {
|
||||
auto duration = util::timed([&child1Coroutine]() {
|
||||
asyncOperation(child1Coroutine.yieldContext(), std::chrono::seconds(5));
|
||||
});
|
||||
EXPECT_TRUE(child1Coroutine.isCancelled());
|
||||
EXPECT_LT(duration, 2000);
|
||||
EXPECT_EQ(child1Coroutine.error(), boost::asio::error::operation_aborted);
|
||||
fnMock_.Call(child1Coroutine);
|
||||
});
|
||||
parentCoroutine.spawnChild([&](Coroutine& child2Coroutine) {
|
||||
child2Coroutine.yield();
|
||||
child2Coroutine.cancelAll();
|
||||
fnMock_.Call(child2Coroutine);
|
||||
});
|
||||
|
||||
auto parentDuration = util::timed([&parentCoroutine]() {
|
||||
asyncOperation(parentCoroutine.yieldContext(), std::chrono::seconds(5));
|
||||
});
|
||||
EXPECT_TRUE(parentCoroutine.isCancelled());
|
||||
EXPECT_LT(parentDuration, 2000);
|
||||
EXPECT_EQ(parentCoroutine.error(), boost::asio::error::operation_aborted);
|
||||
});
|
||||
}
|
||||
|
||||
TEST_F(CoroutineTest, Yield)
|
||||
{
|
||||
testing::StrictMock<testing::MockFunction<void()>> anotherFnMock;
|
||||
testing::Sequence sequence;
|
||||
EXPECT_CALL(fnMock_, Call).InSequence(sequence);
|
||||
EXPECT_CALL(anotherFnMock, Call).InSequence(sequence);
|
||||
|
||||
runCoroutine([&](Coroutine& coroutine) {
|
||||
coroutine.spawnChild([&anotherFnMock](Coroutine& childCoroutine) {
|
||||
childCoroutine.yield();
|
||||
anotherFnMock.Call();
|
||||
});
|
||||
fnMock_.Call(coroutine);
|
||||
});
|
||||
}
|
||||
Reference in New Issue
Block a user