libs/capy/include/boost/capy/io/any_read_source.hpp
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libs/capy/include/boost/capy/io/any_read_source.hpp
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|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2025 Vinnie Falco (vinnie.falco@gmail.com) | ||
| 3 | // | ||
| 4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | ||
| 5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | ||
| 6 | // | ||
| 7 | // Official repository: https://github.com/cppalliance/capy | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_CAPY_IO_ANY_READ_SOURCE_HPP | ||
| 11 | #define BOOST_CAPY_IO_ANY_READ_SOURCE_HPP | ||
| 12 | |||
| 13 | #include <boost/capy/detail/config.hpp> | ||
| 14 | #include <boost/capy/detail/await_suspend_helper.hpp> | ||
| 15 | #include <boost/capy/buffers.hpp> | ||
| 16 | #include <boost/capy/buffers/buffer_array.hpp> | ||
| 17 | #include <boost/capy/buffers/buffer_param.hpp> | ||
| 18 | #include <boost/capy/concept/io_awaitable.hpp> | ||
| 19 | #include <boost/capy/concept/read_source.hpp> | ||
| 20 | #include <boost/capy/ex/io_env.hpp> | ||
| 21 | #include <boost/capy/io_result.hpp> | ||
| 22 | #include <boost/capy/io_task.hpp> | ||
| 23 | |||
| 24 | #include <concepts> | ||
| 25 | #include <coroutine> | ||
| 26 | #include <cstddef> | ||
| 27 | #include <new> | ||
| 28 | #include <span> | ||
| 29 | #include <stop_token> | ||
| 30 | #include <system_error> | ||
| 31 | #include <utility> | ||
| 32 | |||
| 33 | namespace boost { | ||
| 34 | namespace capy { | ||
| 35 | |||
| 36 | /** Type-erased wrapper for any ReadSource. | ||
| 37 | |||
| 38 | This class provides type erasure for any type satisfying the | ||
| 39 | @ref ReadSource concept, enabling runtime polymorphism for | ||
| 40 | source read operations. It uses cached awaitable storage to achieve | ||
| 41 | zero steady-state allocation after construction. | ||
| 42 | |||
| 43 | The wrapper supports two construction modes: | ||
| 44 | - **Owning**: Pass by value to transfer ownership. The wrapper | ||
| 45 | allocates storage and owns the source. | ||
| 46 | - **Reference**: Pass a pointer to wrap without ownership. The | ||
| 47 | pointed-to source must outlive this wrapper. | ||
| 48 | |||
| 49 | @par Awaitable Preallocation | ||
| 50 | The constructor preallocates storage for the type-erased awaitable. | ||
| 51 | This reserves all virtual address space at server startup | ||
| 52 | so memory usage can be measured up front, rather than | ||
| 53 | allocating piecemeal as traffic arrives. | ||
| 54 | |||
| 55 | @par Immediate Completion | ||
| 56 | Operations complete immediately without suspending when the | ||
| 57 | buffer sequence is empty, or when the underlying source's | ||
| 58 | awaitable reports readiness via `await_ready`. | ||
| 59 | |||
| 60 | @par Thread Safety | ||
| 61 | Not thread-safe. Concurrent operations on the same wrapper | ||
| 62 | are undefined behavior. | ||
| 63 | |||
| 64 | @par Example | ||
| 65 | @code | ||
| 66 | // Owning - takes ownership of the source | ||
| 67 | any_read_source rs(some_source{args...}); | ||
| 68 | |||
| 69 | // Reference - wraps without ownership | ||
| 70 | some_source source; | ||
| 71 | any_read_source rs(&source); | ||
| 72 | |||
| 73 | mutable_buffer buf(data, size); | ||
| 74 | auto [ec, n] = co_await rs.read(std::span(&buf, 1)); | ||
| 75 | @endcode | ||
| 76 | |||
| 77 | @see any_read_stream, ReadSource | ||
| 78 | */ | ||
| 79 | class any_read_source | ||
| 80 | { | ||
| 81 | struct vtable; | ||
| 82 | struct awaitable_ops; | ||
| 83 | |||
| 84 | template<ReadSource S> | ||
| 85 | struct vtable_for_impl; | ||
| 86 | |||
| 87 | void* source_ = nullptr; | ||
| 88 | vtable const* vt_ = nullptr; | ||
| 89 | void* cached_awaitable_ = nullptr; | ||
| 90 | void* storage_ = nullptr; | ||
| 91 | awaitable_ops const* active_ops_ = nullptr; | ||
| 92 | |||
| 93 | public: | ||
| 94 | /** Destructor. | ||
| 95 | |||
| 96 | Destroys the owned source (if any) and releases the cached | ||
| 97 | awaitable storage. | ||
| 98 | */ | ||
| 99 | ~any_read_source(); | ||
| 100 | |||
| 101 | /** Default constructor. | ||
| 102 | |||
| 103 | Constructs an empty wrapper. Operations on a default-constructed | ||
| 104 | wrapper result in undefined behavior. | ||
| 105 | */ | ||
| 106 | any_read_source() = default; | ||
| 107 | |||
| 108 | /** Non-copyable. | ||
| 109 | |||
| 110 | The awaitable cache is per-instance and cannot be shared. | ||
| 111 | */ | ||
| 112 | any_read_source(any_read_source const&) = delete; | ||
| 113 | any_read_source& operator=(any_read_source const&) = delete; | ||
| 114 | |||
| 115 | /** Move constructor. | ||
| 116 | |||
| 117 | Transfers ownership of the wrapped source (if owned) and | ||
| 118 | cached awaitable storage from `other`. After the move, `other` is | ||
| 119 | in a default-constructed state. | ||
| 120 | |||
| 121 | @param other The wrapper to move from. | ||
| 122 | */ | ||
| 123 | 1 | any_read_source(any_read_source&& other) noexcept | |
| 124 | 1 | : source_(std::exchange(other.source_, nullptr)) | |
| 125 | 1 | , vt_(std::exchange(other.vt_, nullptr)) | |
| 126 | 1 | , cached_awaitable_(std::exchange(other.cached_awaitable_, nullptr)) | |
| 127 | 1 | , storage_(std::exchange(other.storage_, nullptr)) | |
| 128 | 1 | , active_ops_(std::exchange(other.active_ops_, nullptr)) | |
| 129 | { | ||
| 130 | 1 | } | |
| 131 | |||
| 132 | /** Move assignment operator. | ||
| 133 | |||
| 134 | Destroys any owned source and releases existing resources, | ||
| 135 | then transfers ownership from `other`. | ||
| 136 | |||
| 137 | @param other The wrapper to move from. | ||
| 138 | @return Reference to this wrapper. | ||
| 139 | */ | ||
| 140 | any_read_source& | ||
| 141 | operator=(any_read_source&& other) noexcept; | ||
| 142 | |||
| 143 | /** Construct by taking ownership of a ReadSource. | ||
| 144 | |||
| 145 | Allocates storage and moves the source into this wrapper. | ||
| 146 | The wrapper owns the source and will destroy it. | ||
| 147 | |||
| 148 | @param s The source to take ownership of. | ||
| 149 | */ | ||
| 150 | template<ReadSource S> | ||
| 151 | requires (!std::same_as<std::decay_t<S>, any_read_source>) | ||
| 152 | any_read_source(S s); | ||
| 153 | |||
| 154 | /** Construct by wrapping a ReadSource without ownership. | ||
| 155 | |||
| 156 | Wraps the given source by pointer. The source must remain | ||
| 157 | valid for the lifetime of this wrapper. | ||
| 158 | |||
| 159 | @param s Pointer to the source to wrap. | ||
| 160 | */ | ||
| 161 | template<ReadSource S> | ||
| 162 | any_read_source(S* s); | ||
| 163 | |||
| 164 | /** Check if the wrapper contains a valid source. | ||
| 165 | |||
| 166 | @return `true` if wrapping a source, `false` if default-constructed | ||
| 167 | or moved-from. | ||
| 168 | */ | ||
| 169 | bool | ||
| 170 | 27 | has_value() const noexcept | |
| 171 | { | ||
| 172 | 27 | return source_ != nullptr; | |
| 173 | } | ||
| 174 | |||
| 175 | /** Check if the wrapper contains a valid source. | ||
| 176 | |||
| 177 | @return `true` if wrapping a source, `false` if default-constructed | ||
| 178 | or moved-from. | ||
| 179 | */ | ||
| 180 | explicit | ||
| 181 | 8 | operator bool() const noexcept | |
| 182 | { | ||
| 183 | 8 | return has_value(); | |
| 184 | } | ||
| 185 | |||
| 186 | /** Initiate a partial read operation. | ||
| 187 | |||
| 188 | Reads one or more bytes into the provided buffer sequence. | ||
| 189 | May fill less than the full sequence. | ||
| 190 | |||
| 191 | @param buffers The buffer sequence to read into. | ||
| 192 | |||
| 193 | @return An awaitable yielding `(error_code,std::size_t)`. | ||
| 194 | |||
| 195 | @par Immediate Completion | ||
| 196 | The operation completes immediately without suspending | ||
| 197 | the calling coroutine when: | ||
| 198 | @li The buffer sequence is empty, returning `{error_code{}, 0}`. | ||
| 199 | @li The underlying source's awaitable reports immediate | ||
| 200 | readiness via `await_ready`. | ||
| 201 | |||
| 202 | @note This is a partial operation and may not process the | ||
| 203 | entire buffer sequence. Use @ref read for guaranteed | ||
| 204 | complete transfer. | ||
| 205 | |||
| 206 | @par Preconditions | ||
| 207 | The wrapper must contain a valid source (`has_value() == true`). | ||
| 208 | The caller must not call this function again after a prior | ||
| 209 | call returned an error (including EOF). | ||
| 210 | */ | ||
| 211 | template<MutableBufferSequence MB> | ||
| 212 | auto | ||
| 213 | read_some(MB buffers); | ||
| 214 | |||
| 215 | /** Initiate a complete read operation. | ||
| 216 | |||
| 217 | Reads data into the provided buffer sequence by forwarding | ||
| 218 | to the underlying source's `read` operation. Large buffer | ||
| 219 | sequences are processed in windows, with each window | ||
| 220 | forwarded as a separate `read` call to the underlying source. | ||
| 221 | The operation completes when the entire buffer sequence is | ||
| 222 | filled, end-of-file is reached, or an error occurs. | ||
| 223 | |||
| 224 | @param buffers The buffer sequence to read into. | ||
| 225 | |||
| 226 | @return An awaitable yielding `(error_code,std::size_t)`. | ||
| 227 | |||
| 228 | @par Immediate Completion | ||
| 229 | The operation completes immediately without suspending | ||
| 230 | the calling coroutine when: | ||
| 231 | @li The buffer sequence is empty, returning `{error_code{}, 0}`. | ||
| 232 | @li The underlying source's `read` awaitable reports | ||
| 233 | immediate readiness via `await_ready`. | ||
| 234 | |||
| 235 | @par Postconditions | ||
| 236 | Exactly one of the following is true on return: | ||
| 237 | @li **Success**: `!ec` and `n == buffer_size(buffers)`. | ||
| 238 | The entire buffer was filled. | ||
| 239 | @li **End-of-stream or Error**: `ec` and `n` indicates | ||
| 240 | the number of bytes transferred before the failure. | ||
| 241 | |||
| 242 | @par Preconditions | ||
| 243 | The wrapper must contain a valid source (`has_value() == true`). | ||
| 244 | The caller must not call this function again after a prior | ||
| 245 | call returned an error (including EOF). | ||
| 246 | */ | ||
| 247 | template<MutableBufferSequence MB> | ||
| 248 | io_task<std::size_t> | ||
| 249 | read(MB buffers); | ||
| 250 | |||
| 251 | protected: | ||
| 252 | /** Rebind to a new source after move. | ||
| 253 | |||
| 254 | Updates the internal pointer to reference a new source object. | ||
| 255 | Used by owning wrappers after move assignment when the owned | ||
| 256 | object has moved to a new location. | ||
| 257 | |||
| 258 | @param new_source The new source to bind to. Must be the same | ||
| 259 | type as the original source. | ||
| 260 | |||
| 261 | @note Terminates if called with a source of different type | ||
| 262 | than the original. | ||
| 263 | */ | ||
| 264 | template<ReadSource S> | ||
| 265 | void | ||
| 266 | rebind(S& new_source) noexcept | ||
| 267 | { | ||
| 268 | if(vt_ != &vtable_for_impl<S>::value) | ||
| 269 | std::terminate(); | ||
| 270 | source_ = &new_source; | ||
| 271 | } | ||
| 272 | |||
| 273 | private: | ||
| 274 | auto | ||
| 275 | read_(std::span<mutable_buffer const> buffers); | ||
| 276 | }; | ||
| 277 | |||
| 278 | //---------------------------------------------------------- | ||
| 279 | |||
| 280 | // ordered by call sequence for cache line coherence | ||
| 281 | struct any_read_source::awaitable_ops | ||
| 282 | { | ||
| 283 | bool (*await_ready)(void*); | ||
| 284 | std::coroutine_handle<> (*await_suspend)(void*, std::coroutine_handle<>, io_env const*); | ||
| 285 | io_result<std::size_t> (*await_resume)(void*); | ||
| 286 | void (*destroy)(void*) noexcept; | ||
| 287 | }; | ||
| 288 | |||
| 289 | // ordered by call frequency for cache line coherence | ||
| 290 | struct any_read_source::vtable | ||
| 291 | { | ||
| 292 | awaitable_ops const* (*construct_read_some_awaitable)( | ||
| 293 | void* source, | ||
| 294 | void* storage, | ||
| 295 | std::span<mutable_buffer const> buffers); | ||
| 296 | awaitable_ops const* (*construct_read_awaitable)( | ||
| 297 | void* source, | ||
| 298 | void* storage, | ||
| 299 | std::span<mutable_buffer const> buffers); | ||
| 300 | std::size_t awaitable_size; | ||
| 301 | std::size_t awaitable_align; | ||
| 302 | void (*destroy)(void*) noexcept; | ||
| 303 | }; | ||
| 304 | |||
| 305 | template<ReadSource S> | ||
| 306 | struct any_read_source::vtable_for_impl | ||
| 307 | { | ||
| 308 | using ReadSomeAwaitable = decltype(std::declval<S&>().read_some( | ||
| 309 | std::span<mutable_buffer const>{})); | ||
| 310 | using ReadAwaitable = decltype(std::declval<S&>().read( | ||
| 311 | std::span<mutable_buffer const>{})); | ||
| 312 | |||
| 313 | static void | ||
| 314 | 6 | do_destroy_impl(void* source) noexcept | |
| 315 | { | ||
| 316 | 6 | static_cast<S*>(source)->~S(); | |
| 317 | 6 | } | |
| 318 | |||
| 319 | static awaitable_ops const* | ||
| 320 | 52 | construct_read_some_awaitable_impl( | |
| 321 | void* source, | ||
| 322 | void* storage, | ||
| 323 | std::span<mutable_buffer const> buffers) | ||
| 324 | { | ||
| 325 | 52 | auto& s = *static_cast<S*>(source); | |
| 326 | 52 | ::new(storage) ReadSomeAwaitable(s.read_some(buffers)); | |
| 327 | |||
| 328 | static constexpr awaitable_ops ops = { | ||
| 329 | +[](void* p) { | ||
| 330 | return static_cast<ReadSomeAwaitable*>(p)->await_ready(); | ||
| 331 | }, | ||
| 332 | +[](void* p, std::coroutine_handle<> h, io_env const* env) { | ||
| 333 | return detail::call_await_suspend( | ||
| 334 | static_cast<ReadSomeAwaitable*>(p), h, env); | ||
| 335 | }, | ||
| 336 | +[](void* p) { | ||
| 337 | return static_cast<ReadSomeAwaitable*>(p)->await_resume(); | ||
| 338 | }, | ||
| 339 | +[](void* p) noexcept { | ||
| 340 | static_cast<ReadSomeAwaitable*>(p)->~ReadSomeAwaitable(); | ||
| 341 | } | ||
| 342 | }; | ||
| 343 | 52 | return &ops; | |
| 344 | } | ||
| 345 | |||
| 346 | static awaitable_ops const* | ||
| 347 | 116 | construct_read_awaitable_impl( | |
| 348 | void* source, | ||
| 349 | void* storage, | ||
| 350 | std::span<mutable_buffer const> buffers) | ||
| 351 | { | ||
| 352 | 116 | auto& s = *static_cast<S*>(source); | |
| 353 | 116 | ::new(storage) ReadAwaitable(s.read(buffers)); | |
| 354 | |||
| 355 | static constexpr awaitable_ops ops = { | ||
| 356 | +[](void* p) { | ||
| 357 | return static_cast<ReadAwaitable*>(p)->await_ready(); | ||
| 358 | }, | ||
| 359 | +[](void* p, std::coroutine_handle<> h, io_env const* env) { | ||
| 360 | return detail::call_await_suspend( | ||
| 361 | static_cast<ReadAwaitable*>(p), h, env); | ||
| 362 | }, | ||
| 363 | +[](void* p) { | ||
| 364 | return static_cast<ReadAwaitable*>(p)->await_resume(); | ||
| 365 | }, | ||
| 366 | +[](void* p) noexcept { | ||
| 367 | static_cast<ReadAwaitable*>(p)->~ReadAwaitable(); | ||
| 368 | } | ||
| 369 | }; | ||
| 370 | 116 | return &ops; | |
| 371 | } | ||
| 372 | |||
| 373 | static constexpr std::size_t max_awaitable_size = | ||
| 374 | sizeof(ReadSomeAwaitable) > sizeof(ReadAwaitable) | ||
| 375 | ? sizeof(ReadSomeAwaitable) | ||
| 376 | : sizeof(ReadAwaitable); | ||
| 377 | static constexpr std::size_t max_awaitable_align = | ||
| 378 | alignof(ReadSomeAwaitable) > alignof(ReadAwaitable) | ||
| 379 | ? alignof(ReadSomeAwaitable) | ||
| 380 | : alignof(ReadAwaitable); | ||
| 381 | |||
| 382 | static constexpr vtable value = { | ||
| 383 | &construct_read_some_awaitable_impl, | ||
| 384 | &construct_read_awaitable_impl, | ||
| 385 | max_awaitable_size, | ||
| 386 | max_awaitable_align, | ||
| 387 | &do_destroy_impl | ||
| 388 | }; | ||
| 389 | }; | ||
| 390 | |||
| 391 | //---------------------------------------------------------- | ||
| 392 | |||
| 393 | inline | ||
| 394 | 145 | any_read_source::~any_read_source() | |
| 395 | { | ||
| 396 |
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145 | if(storage_) |
| 397 | { | ||
| 398 | 6 | vt_->destroy(source_); | |
| 399 | 6 | ::operator delete(storage_); | |
| 400 | } | ||
| 401 |
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145 | if(cached_awaitable_) |
| 402 | { | ||
| 403 |
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139 | if(active_ops_) |
| 404 | 1 | active_ops_->destroy(cached_awaitable_); | |
| 405 | 139 | ::operator delete(cached_awaitable_); | |
| 406 | } | ||
| 407 | 145 | } | |
| 408 | |||
| 409 | inline any_read_source& | ||
| 410 | 4 | any_read_source::operator=(any_read_source&& other) noexcept | |
| 411 | { | ||
| 412 |
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4 | if(this != &other) |
| 413 | { | ||
| 414 |
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3 | if(storage_) |
| 415 | { | ||
| 416 | ✗ | vt_->destroy(source_); | |
| 417 | ✗ | ::operator delete(storage_); | |
| 418 | } | ||
| 419 |
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3 | if(cached_awaitable_) |
| 420 | { | ||
| 421 |
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2 | if(active_ops_) |
| 422 | 1 | active_ops_->destroy(cached_awaitable_); | |
| 423 | 2 | ::operator delete(cached_awaitable_); | |
| 424 | } | ||
| 425 | 3 | source_ = std::exchange(other.source_, nullptr); | |
| 426 | 3 | vt_ = std::exchange(other.vt_, nullptr); | |
| 427 | 3 | cached_awaitable_ = std::exchange(other.cached_awaitable_, nullptr); | |
| 428 | 3 | storage_ = std::exchange(other.storage_, nullptr); | |
| 429 | 3 | active_ops_ = std::exchange(other.active_ops_, nullptr); | |
| 430 | } | ||
| 431 | 4 | return *this; | |
| 432 | } | ||
| 433 | |||
| 434 | template<ReadSource S> | ||
| 435 | requires (!std::same_as<std::decay_t<S>, any_read_source>) | ||
| 436 | 6 | any_read_source::any_read_source(S s) | |
| 437 | 6 | : vt_(&vtable_for_impl<S>::value) | |
| 438 | { | ||
| 439 | struct guard { | ||
| 440 | any_read_source* self; | ||
| 441 | bool committed = false; | ||
| 442 | 6 | ~guard() { | |
| 443 |
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6 | if(!committed && self->storage_) { |
| 444 | ✗ | self->vt_->destroy(self->source_); | |
| 445 | ✗ | ::operator delete(self->storage_); | |
| 446 | ✗ | self->storage_ = nullptr; | |
| 447 | ✗ | self->source_ = nullptr; | |
| 448 | } | ||
| 449 | 6 | } | |
| 450 | 6 | } g{this}; | |
| 451 | |||
| 452 |
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6 | storage_ = ::operator new(sizeof(S)); |
| 453 | 6 | source_ = ::new(storage_) S(std::move(s)); | |
| 454 | |||
| 455 | // Preallocate the awaitable storage | ||
| 456 |
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6 | cached_awaitable_ = ::operator new(vt_->awaitable_size); |
| 457 | |||
| 458 | 6 | g.committed = true; | |
| 459 | 6 | } | |
| 460 | |||
| 461 | template<ReadSource S> | ||
| 462 | 135 | any_read_source::any_read_source(S* s) | |
| 463 | 135 | : source_(s) | |
| 464 | 135 | , vt_(&vtable_for_impl<S>::value) | |
| 465 | { | ||
| 466 | // Preallocate the awaitable storage | ||
| 467 | 135 | cached_awaitable_ = ::operator new(vt_->awaitable_size); | |
| 468 | 135 | } | |
| 469 | |||
| 470 | //---------------------------------------------------------- | ||
| 471 | |||
| 472 | template<MutableBufferSequence MB> | ||
| 473 | auto | ||
| 474 | 54 | any_read_source::read_some(MB buffers) | |
| 475 | { | ||
| 476 | struct awaitable | ||
| 477 | { | ||
| 478 | any_read_source* self_; | ||
| 479 | mutable_buffer_array<detail::max_iovec_> ba_; | ||
| 480 | |||
| 481 | awaitable(any_read_source* self, MB const& buffers) | ||
| 482 | : self_(self) | ||
| 483 | , ba_(buffers) | ||
| 484 | { | ||
| 485 | } | ||
| 486 | |||
| 487 | bool | ||
| 488 | await_ready() const noexcept | ||
| 489 | { | ||
| 490 | return ba_.to_span().empty(); | ||
| 491 | } | ||
| 492 | |||
| 493 | std::coroutine_handle<> | ||
| 494 | await_suspend(std::coroutine_handle<> h, io_env const* env) | ||
| 495 | { | ||
| 496 | self_->active_ops_ = self_->vt_->construct_read_some_awaitable( | ||
| 497 | self_->source_, | ||
| 498 | self_->cached_awaitable_, | ||
| 499 | ba_.to_span()); | ||
| 500 | |||
| 501 | if(self_->active_ops_->await_ready(self_->cached_awaitable_)) | ||
| 502 | return h; | ||
| 503 | |||
| 504 | return self_->active_ops_->await_suspend( | ||
| 505 | self_->cached_awaitable_, h, env); | ||
| 506 | } | ||
| 507 | |||
| 508 | io_result<std::size_t> | ||
| 509 | await_resume() | ||
| 510 | { | ||
| 511 | if(ba_.to_span().empty()) | ||
| 512 | return {{}, 0}; | ||
| 513 | |||
| 514 | struct guard { | ||
| 515 | any_read_source* self; | ||
| 516 | ~guard() { | ||
| 517 | self->active_ops_->destroy(self->cached_awaitable_); | ||
| 518 | self->active_ops_ = nullptr; | ||
| 519 | } | ||
| 520 | } g{self_}; | ||
| 521 | return self_->active_ops_->await_resume( | ||
| 522 | self_->cached_awaitable_); | ||
| 523 | } | ||
| 524 | }; | ||
| 525 | 54 | return awaitable(this, buffers); | |
| 526 | } | ||
| 527 | |||
| 528 | inline auto | ||
| 529 | 116 | any_read_source::read_(std::span<mutable_buffer const> buffers) | |
| 530 | { | ||
| 531 | struct awaitable | ||
| 532 | { | ||
| 533 | any_read_source* self_; | ||
| 534 | std::span<mutable_buffer const> buffers_; | ||
| 535 | |||
| 536 | bool | ||
| 537 | 116 | await_ready() const noexcept | |
| 538 | { | ||
| 539 | 116 | return false; | |
| 540 | } | ||
| 541 | |||
| 542 | std::coroutine_handle<> | ||
| 543 | 116 | await_suspend(std::coroutine_handle<> h, io_env const* env) | |
| 544 | { | ||
| 545 | 232 | self_->active_ops_ = self_->vt_->construct_read_awaitable( | |
| 546 | 116 | self_->source_, | |
| 547 | 116 | self_->cached_awaitable_, | |
| 548 | buffers_); | ||
| 549 | |||
| 550 |
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116 | if(self_->active_ops_->await_ready(self_->cached_awaitable_)) |
| 551 | 116 | return h; | |
| 552 | |||
| 553 | ✗ | return self_->active_ops_->await_suspend( | |
| 554 | ✗ | self_->cached_awaitable_, h, env); | |
| 555 | } | ||
| 556 | |||
| 557 | io_result<std::size_t> | ||
| 558 | 116 | await_resume() | |
| 559 | { | ||
| 560 | struct guard { | ||
| 561 | any_read_source* self; | ||
| 562 | 116 | ~guard() { | |
| 563 | 116 | self->active_ops_->destroy(self->cached_awaitable_); | |
| 564 | 116 | self->active_ops_ = nullptr; | |
| 565 | 116 | } | |
| 566 | 116 | } g{self_}; | |
| 567 | 116 | return self_->active_ops_->await_resume( | |
| 568 |
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200 | self_->cached_awaitable_); |
| 569 | 116 | } | |
| 570 | }; | ||
| 571 | 116 | return awaitable{this, buffers}; | |
| 572 | } | ||
| 573 | |||
| 574 | template<MutableBufferSequence MB> | ||
| 575 | io_task<std::size_t> | ||
| 576 |
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110 | any_read_source::read(MB buffers) |
| 577 | { | ||
| 578 | buffer_param bp(buffers); | ||
| 579 | std::size_t total = 0; | ||
| 580 | |||
| 581 | for(;;) | ||
| 582 | { | ||
| 583 | auto bufs = bp.data(); | ||
| 584 | if(bufs.empty()) | ||
| 585 | break; | ||
| 586 | |||
| 587 | auto [ec, n] = co_await read_(bufs); | ||
| 588 | total += n; | ||
| 589 | if(ec) | ||
| 590 | co_return {ec, total}; | ||
| 591 | bp.consume(n); | ||
| 592 | } | ||
| 593 | |||
| 594 | co_return {{}, total}; | ||
| 595 | 220 | } | |
| 596 | |||
| 597 | } // namespace capy | ||
| 598 | } // namespace boost | ||
| 599 | |||
| 600 | #endif | ||
| 601 |