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 dot falco at gmail dot 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/buffers.hpp> | ||
| 15 | #include <boost/capy/buffers/buffer_param.hpp> | ||
| 16 | #include <boost/capy/concept/io_awaitable.hpp> | ||
| 17 | #include <boost/capy/concept/read_source.hpp> | ||
| 18 | #include <boost/capy/coro.hpp> | ||
| 19 | #include <boost/capy/ex/executor_ref.hpp> | ||
| 20 | #include <boost/capy/io_result.hpp> | ||
| 21 | #include <boost/capy/task.hpp> | ||
| 22 | |||
| 23 | #include <system_error> | ||
| 24 | |||
| 25 | #include <concepts> | ||
| 26 | #include <coroutine> | ||
| 27 | #include <cstddef> | ||
| 28 | #include <exception> | ||
| 29 | #include <span> | ||
| 30 | #include <stop_token> | ||
| 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 a cached coroutine frame 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 Frame Preallocation | ||
| 50 | The constructor preallocates the internal coroutine frame. | ||
| 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 Thread Safety | ||
| 56 | Not thread-safe. Concurrent operations on the same wrapper | ||
| 57 | are undefined behavior. | ||
| 58 | |||
| 59 | @par Example | ||
| 60 | @code | ||
| 61 | // Owning - takes ownership of the source | ||
| 62 | any_read_source rs(some_source{args...}); | ||
| 63 | |||
| 64 | // Reference - wraps without ownership | ||
| 65 | some_source source; | ||
| 66 | any_read_source rs(&source); | ||
| 67 | |||
| 68 | mutable_buffer buf(data, size); | ||
| 69 | auto [ec, n] = co_await rs.read(std::span(&buf, 1)); | ||
| 70 | @endcode | ||
| 71 | |||
| 72 | @see any_read_stream, ReadSource | ||
| 73 | */ | ||
| 74 | class any_read_source | ||
| 75 | { | ||
| 76 | struct vtable; | ||
| 77 | |||
| 78 | template<ReadSource S> | ||
| 79 | struct vtable_for_impl; | ||
| 80 | |||
| 81 | struct read_op; | ||
| 82 | |||
| 83 | void* source_ = nullptr; | ||
| 84 | vtable const* vt_ = nullptr; | ||
| 85 | void* cached_frame_ = nullptr; | ||
| 86 | std::size_t cached_size_ = 0; | ||
| 87 | void* storage_ = nullptr; | ||
| 88 | |||
| 89 | template<ReadSource S> | ||
| 90 | static coro | ||
| 91 | do_read_impl( | ||
| 92 | void* source, | ||
| 93 | any_read_source* wrapper, | ||
| 94 | std::span<mutable_buffer const> buffers, | ||
| 95 | coro h, | ||
| 96 | executor_ref ex, | ||
| 97 | std::stop_token token, | ||
| 98 | std::error_code* ec, | ||
| 99 | std::size_t* n); | ||
| 100 | |||
| 101 | template<ReadSource S> | ||
| 102 | static read_op | ||
| 103 | read_coro( | ||
| 104 | any_read_source* wrapper, | ||
| 105 | S& source, | ||
| 106 | std::span<mutable_buffer const> bufs, | ||
| 107 | std::error_code* out_ec, | ||
| 108 | std::size_t* out_n); | ||
| 109 | |||
| 110 | void* alloc_frame(std::size_t size); | ||
| 111 | void free_frame(void* p, std::size_t size); | ||
| 112 | |||
| 113 | public: | ||
| 114 | /** Destructor. | ||
| 115 | |||
| 116 | Destroys the owned source (if any) and releases the cached | ||
| 117 | coroutine frame. | ||
| 118 | */ | ||
| 119 | ~any_read_source(); | ||
| 120 | |||
| 121 | /** Default constructor. | ||
| 122 | |||
| 123 | Constructs an empty wrapper. Operations on a default-constructed | ||
| 124 | wrapper result in undefined behavior. | ||
| 125 | */ | ||
| 126 | any_read_source() = default; | ||
| 127 | |||
| 128 | /** Non-copyable. | ||
| 129 | |||
| 130 | The frame cache is per-instance and cannot be shared. | ||
| 131 | */ | ||
| 132 | any_read_source(any_read_source const&) = delete; | ||
| 133 | any_read_source& operator=(any_read_source const&) = delete; | ||
| 134 | |||
| 135 | /** Move constructor. | ||
| 136 | |||
| 137 | Transfers ownership of the wrapped source (if owned) and | ||
| 138 | cached frame from `other`. After the move, `other` is | ||
| 139 | in a default-constructed state. | ||
| 140 | |||
| 141 | @param other The wrapper to move from. | ||
| 142 | */ | ||
| 143 | 1 | any_read_source(any_read_source&& other) noexcept | |
| 144 | 1 | : source_(std::exchange(other.source_, nullptr)) | |
| 145 | 1 | , vt_(std::exchange(other.vt_, nullptr)) | |
| 146 | 1 | , cached_frame_(std::exchange(other.cached_frame_, nullptr)) | |
| 147 | 1 | , cached_size_(std::exchange(other.cached_size_, 0)) | |
| 148 | 1 | , storage_(std::exchange(other.storage_, nullptr)) | |
| 149 | { | ||
| 150 | 1 | } | |
| 151 | |||
| 152 | /** Move assignment operator. | ||
| 153 | |||
| 154 | Destroys any owned source and releases existing resources, | ||
| 155 | then transfers ownership from `other`. | ||
| 156 | |||
| 157 | @param other The wrapper to move from. | ||
| 158 | @return Reference to this wrapper. | ||
| 159 | */ | ||
| 160 | any_read_source& | ||
| 161 | operator=(any_read_source&& other) noexcept; | ||
| 162 | |||
| 163 | /** Construct by taking ownership of a ReadSource. | ||
| 164 | |||
| 165 | Allocates storage and moves the source into this wrapper. | ||
| 166 | The wrapper owns the source and will destroy it. | ||
| 167 | |||
| 168 | @param s The source to take ownership of. | ||
| 169 | */ | ||
| 170 | template<ReadSource S> | ||
| 171 | requires (!std::same_as<std::decay_t<S>, any_read_source>) | ||
| 172 | any_read_source(S s); | ||
| 173 | |||
| 174 | /** Construct by wrapping a ReadSource without ownership. | ||
| 175 | |||
| 176 | Wraps the given source by pointer. The source must remain | ||
| 177 | valid for the lifetime of this wrapper. | ||
| 178 | |||
| 179 | @param s Pointer to the source to wrap. | ||
| 180 | */ | ||
| 181 | template<ReadSource S> | ||
| 182 | 88 | any_read_source(S* s) noexcept | |
| 183 | 88 | : source_(s) | |
| 184 | 88 | , vt_(&vtable_for_impl<S>::value) | |
| 185 | { | ||
| 186 | // Preallocate the coroutine frame | ||
| 187 | 88 | read_coro<S>(this, *s, {}, nullptr, nullptr); | |
| 188 | 88 | } | |
| 189 | |||
| 190 | /** Check if the wrapper contains a valid source. | ||
| 191 | |||
| 192 | @return `true` if wrapping a source, `false` if default-constructed | ||
| 193 | or moved-from. | ||
| 194 | */ | ||
| 195 | bool | ||
| 196 | 9 | has_value() const noexcept | |
| 197 | { | ||
| 198 | 9 | return source_ != nullptr; | |
| 199 | } | ||
| 200 | |||
| 201 | /** Check if the wrapper contains a valid source. | ||
| 202 | |||
| 203 | @return `true` if wrapping a source, `false` if default-constructed | ||
| 204 | or moved-from. | ||
| 205 | */ | ||
| 206 | explicit | ||
| 207 | 2 | operator bool() const noexcept | |
| 208 | { | ||
| 209 | 2 | return has_value(); | |
| 210 | } | ||
| 211 | |||
| 212 | /** Initiate an asynchronous read operation. | ||
| 213 | |||
| 214 | Reads data into the provided buffer sequence. The operation | ||
| 215 | completes when the entire buffer sequence is filled, end-of-file | ||
| 216 | is reached, or an error occurs. | ||
| 217 | |||
| 218 | @param buffers The buffer sequence to read into. Passed by | ||
| 219 | value to ensure the sequence lives in the coroutine frame | ||
| 220 | across suspension points. | ||
| 221 | |||
| 222 | @return An awaitable yielding `(error_code,std::size_t)`. | ||
| 223 | |||
| 224 | @par Postconditions | ||
| 225 | Exactly one of the following is true on return: | ||
| 226 | @li **Success**: `!ec` and `n == buffer_size(buffers)`. | ||
| 227 | The entire buffer was filled. | ||
| 228 | @li **End-of-stream or Error**: `ec` and `n` indicates | ||
| 229 | the number of bytes transferred before the failure. | ||
| 230 | |||
| 231 | @par Preconditions | ||
| 232 | The wrapper must contain a valid source (`has_value() == true`). | ||
| 233 | */ | ||
| 234 | template<MutableBufferSequence MB> | ||
| 235 | task<io_result<std::size_t>> | ||
| 236 | read(MB buffers); | ||
| 237 | |||
| 238 | protected: | ||
| 239 | /** Rebind to a new source after move. | ||
| 240 | |||
| 241 | Updates the internal pointer to reference a new source object. | ||
| 242 | Used by owning wrappers after move assignment when the owned | ||
| 243 | object has moved to a new location. | ||
| 244 | |||
| 245 | @param new_source The new source to bind to. Must be the same | ||
| 246 | type as the original source. | ||
| 247 | |||
| 248 | @note Terminates if called with a source of different type | ||
| 249 | than the original. | ||
| 250 | */ | ||
| 251 | template<ReadSource S> | ||
| 252 | void | ||
| 253 | rebind(S& new_source) noexcept | ||
| 254 | { | ||
| 255 | if(vt_ != &vtable_for_impl<S>::value) | ||
| 256 | std::terminate(); | ||
| 257 | source_ = &new_source; | ||
| 258 | } | ||
| 259 | |||
| 260 | private: | ||
| 261 | auto | ||
| 262 | read_some_(std::span<mutable_buffer const> buffers); | ||
| 263 | }; | ||
| 264 | |||
| 265 | //---------------------------------------------------------- | ||
| 266 | |||
| 267 | struct any_read_source::vtable | ||
| 268 | { | ||
| 269 | void (*destroy)(void*) noexcept; | ||
| 270 | |||
| 271 | coro (*do_read)( | ||
| 272 | void* source, | ||
| 273 | any_read_source* wrapper, | ||
| 274 | std::span<mutable_buffer const> buffers, | ||
| 275 | coro h, | ||
| 276 | executor_ref ex, | ||
| 277 | std::stop_token token, | ||
| 278 | std::error_code* ec, | ||
| 279 | std::size_t* n); | ||
| 280 | }; | ||
| 281 | |||
| 282 | template<ReadSource S> | ||
| 283 | struct any_read_source::vtable_for_impl | ||
| 284 | { | ||
| 285 | static void | ||
| 286 | ✗ | do_destroy_impl(void* source) noexcept | |
| 287 | { | ||
| 288 | ✗ | static_cast<S*>(source)->~S(); | |
| 289 | ✗ | } | |
| 290 | |||
| 291 | static constexpr vtable value = { | ||
| 292 | &do_destroy_impl, | ||
| 293 | &any_read_source::do_read_impl<S> | ||
| 294 | }; | ||
| 295 | }; | ||
| 296 | |||
| 297 | //---------------------------------------------------------- | ||
| 298 | |||
| 299 | inline | ||
| 300 | 91 | any_read_source::~any_read_source() | |
| 301 | { | ||
| 302 |
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91 | if(storage_) |
| 303 | { | ||
| 304 | ✗ | vt_->destroy(source_); | |
| 305 | ✗ | ::operator delete(storage_); | |
| 306 | } | ||
| 307 |
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91 | if(cached_frame_) |
| 308 | 88 | ::operator delete(cached_frame_); | |
| 309 | 91 | } | |
| 310 | |||
| 311 | inline any_read_source& | ||
| 312 | 1 | any_read_source::operator=(any_read_source&& other) noexcept | |
| 313 | { | ||
| 314 |
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1 | if(this != &other) |
| 315 | { | ||
| 316 |
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1 | if(storage_) |
| 317 | { | ||
| 318 | ✗ | vt_->destroy(source_); | |
| 319 | ✗ | ::operator delete(storage_); | |
| 320 | } | ||
| 321 |
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1 | if(cached_frame_) |
| 322 | ✗ | ::operator delete(cached_frame_); | |
| 323 | 1 | source_ = std::exchange(other.source_, nullptr); | |
| 324 | 1 | vt_ = std::exchange(other.vt_, nullptr); | |
| 325 | 1 | cached_frame_ = std::exchange(other.cached_frame_, nullptr); | |
| 326 | 1 | cached_size_ = std::exchange(other.cached_size_, 0); | |
| 327 | 1 | storage_ = std::exchange(other.storage_, nullptr); | |
| 328 | } | ||
| 329 | 1 | return *this; | |
| 330 | } | ||
| 331 | |||
| 332 | template<ReadSource S> | ||
| 333 | requires (!std::same_as<std::decay_t<S>, any_read_source>) | ||
| 334 | any_read_source::any_read_source(S s) | ||
| 335 | : vt_(&vtable_for_impl<S>::value) | ||
| 336 | { | ||
| 337 | struct guard { | ||
| 338 | any_read_source* self; | ||
| 339 | bool committed = false; | ||
| 340 | ~guard() { | ||
| 341 | if(!committed && self->storage_) { | ||
| 342 | self->vt_->destroy(self->source_); | ||
| 343 | ::operator delete(self->storage_); | ||
| 344 | self->storage_ = nullptr; | ||
| 345 | self->source_ = nullptr; | ||
| 346 | } | ||
| 347 | } | ||
| 348 | } g{this}; | ||
| 349 | |||
| 350 | storage_ = ::operator new(sizeof(S)); | ||
| 351 | source_ = ::new(storage_) S(std::move(s)); | ||
| 352 | |||
| 353 | // Preallocate the coroutine frame | ||
| 354 | auto& ref = *static_cast<S*>(source_); | ||
| 355 | read_coro<S>(this, ref, {}, nullptr, nullptr); | ||
| 356 | |||
| 357 | g.committed = true; | ||
| 358 | } | ||
| 359 | |||
| 360 | //---------------------------------------------------------- | ||
| 361 | |||
| 362 | struct any_read_source::read_op | ||
| 363 | { | ||
| 364 | struct promise_type | ||
| 365 | { | ||
| 366 | executor_ref executor_; | ||
| 367 | std::stop_token stop_token_; | ||
| 368 | coro caller_h_{}; | ||
| 369 | |||
| 370 | 218 | promise_type() = default; | |
| 371 | |||
| 372 | read_op | ||
| 373 | 218 | get_return_object() noexcept | |
| 374 | { | ||
| 375 | return read_op{ | ||
| 376 | 218 | std::coroutine_handle<promise_type>::from_promise(*this)}; | |
| 377 | } | ||
| 378 | |||
| 379 | std::suspend_always | ||
| 380 | 218 | initial_suspend() noexcept | |
| 381 | { | ||
| 382 | 218 | return {}; | |
| 383 | } | ||
| 384 | |||
| 385 | auto | ||
| 386 | 99 | final_suspend() noexcept | |
| 387 | { | ||
| 388 | struct awaiter | ||
| 389 | { | ||
| 390 | promise_type* p_; | ||
| 391 | |||
| 392 | 99 | bool await_ready() const noexcept { return false; } | |
| 393 | |||
| 394 | 99 | coro await_suspend(coro) const noexcept | |
| 395 | { | ||
| 396 |
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99 | if(p_->caller_h_) |
| 397 | ✗ | return p_->caller_h_; | |
| 398 | 99 | return std::noop_coroutine(); | |
| 399 | } | ||
| 400 | |||
| 401 | ✗ | void await_resume() const noexcept {} | |
| 402 | }; | ||
| 403 | 99 | return awaiter{this}; | |
| 404 | } | ||
| 405 | |||
| 406 | void | ||
| 407 | 99 | return_void() noexcept | |
| 408 | { | ||
| 409 | 99 | } | |
| 410 | |||
| 411 | void | ||
| 412 | 31 | unhandled_exception() | |
| 413 | { | ||
| 414 | 31 | throw; | |
| 415 | } | ||
| 416 | |||
| 417 | template<class... Args> | ||
| 418 | static void* | ||
| 419 | 218 | operator new( | |
| 420 | std::size_t size, | ||
| 421 | any_read_source* wrapper, | ||
| 422 | Args&&...) | ||
| 423 | { | ||
| 424 | 218 | return wrapper->alloc_frame(size); | |
| 425 | } | ||
| 426 | |||
| 427 | template<class... Args> | ||
| 428 | static void | ||
| 429 | operator delete(void*, any_read_source*, Args&&...) noexcept | ||
| 430 | { | ||
| 431 | } | ||
| 432 | |||
| 433 | static void | ||
| 434 | 218 | operator delete(void*, std::size_t) noexcept | |
| 435 | { | ||
| 436 | 218 | } | |
| 437 | |||
| 438 | void | ||
| 439 | 130 | set_executor(executor_ref ex) noexcept | |
| 440 | { | ||
| 441 | 130 | executor_ = ex; | |
| 442 | 130 | } | |
| 443 | |||
| 444 | void | ||
| 445 | 130 | set_stop_token(std::stop_token token) noexcept | |
| 446 | { | ||
| 447 | 130 | stop_token_ = token; | |
| 448 | 130 | } | |
| 449 | |||
| 450 | void | ||
| 451 | ✗ | set_caller(coro h) noexcept | |
| 452 | { | ||
| 453 | ✗ | caller_h_ = h; | |
| 454 | ✗ | } | |
| 455 | |||
| 456 | template<class Awaitable> | ||
| 457 | struct transform_awaiter | ||
| 458 | { | ||
| 459 | std::decay_t<Awaitable> a_; | ||
| 460 | promise_type* p_; | ||
| 461 | |||
| 462 | 130 | bool await_ready() | |
| 463 | { | ||
| 464 | 130 | return a_.await_ready(); | |
| 465 | } | ||
| 466 | |||
| 467 | 130 | decltype(auto) await_resume() | |
| 468 | { | ||
| 469 | 130 | return a_.await_resume(); | |
| 470 | } | ||
| 471 | |||
| 472 | ✗ | auto await_suspend(coro h) | |
| 473 | { | ||
| 474 | ✗ | return a_.await_suspend(h, p_->executor_, p_->stop_token_); | |
| 475 | } | ||
| 476 | }; | ||
| 477 | |||
| 478 | template<class Awaitable> | ||
| 479 | 130 | auto await_transform(Awaitable&& a) | |
| 480 | { | ||
| 481 | using A = std::decay_t<Awaitable>; | ||
| 482 | if constexpr (IoAwaitable<A>) | ||
| 483 | { | ||
| 484 | return transform_awaiter<Awaitable>{ | ||
| 485 | 130 | std::forward<Awaitable>(a), this}; | |
| 486 | } | ||
| 487 | else | ||
| 488 | { | ||
| 489 | static_assert(sizeof(A) == 0, "requires IoAwaitable"); | ||
| 490 | } | ||
| 491 | } | ||
| 492 | }; | ||
| 493 | |||
| 494 | std::coroutine_handle<promise_type> h_; | ||
| 495 | |||
| 496 | 218 | ~read_op() | |
| 497 | { | ||
| 498 |
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218 | if(h_) |
| 499 | 119 | h_.destroy(); | |
| 500 | 218 | } | |
| 501 | |||
| 502 | read_op(read_op const&) = delete; | ||
| 503 | read_op& operator=(read_op const&) = delete; | ||
| 504 | |||
| 505 | read_op(read_op&& other) noexcept | ||
| 506 | : h_(std::exchange(other.h_, nullptr)) | ||
| 507 | { | ||
| 508 | } | ||
| 509 | |||
| 510 | read_op& operator=(read_op&& other) noexcept | ||
| 511 | { | ||
| 512 | if(this != &other) | ||
| 513 | { | ||
| 514 | if(h_) | ||
| 515 | h_.destroy(); | ||
| 516 | h_ = std::exchange(other.h_, nullptr); | ||
| 517 | } | ||
| 518 | return *this; | ||
| 519 | } | ||
| 520 | |||
| 521 | private: | ||
| 522 | explicit | ||
| 523 | 218 | read_op(std::coroutine_handle<promise_type> h) noexcept | |
| 524 | 218 | : h_(h) | |
| 525 | { | ||
| 526 | 218 | } | |
| 527 | }; | ||
| 528 | |||
| 529 | //---------------------------------------------------------- | ||
| 530 | |||
| 531 | inline void* | ||
| 532 | 218 | any_read_source::alloc_frame(std::size_t size) | |
| 533 | { | ||
| 534 |
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218 | if(cached_frame_ && cached_size_ >= size) |
| 535 | 130 | return cached_frame_; | |
| 536 | |||
| 537 |
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88 | if(cached_frame_) |
| 538 | ✗ | ::operator delete(cached_frame_); | |
| 539 | |||
| 540 | 88 | cached_frame_ = ::operator new(size); | |
| 541 | 88 | cached_size_ = size; | |
| 542 | 88 | return cached_frame_; | |
| 543 | } | ||
| 544 | |||
| 545 | inline void | ||
| 546 | any_read_source::free_frame(void*, std::size_t) | ||
| 547 | { | ||
| 548 | // Keep the frame cached for reuse | ||
| 549 | } | ||
| 550 | |||
| 551 | #if defined(__GNUC__) && !defined(__clang__) | ||
| 552 | #pragma GCC diagnostic push | ||
| 553 | #pragma GCC diagnostic ignored "-Wmismatched-new-delete" | ||
| 554 | #endif | ||
| 555 | |||
| 556 | template<ReadSource S> | ||
| 557 | any_read_source::read_op | ||
| 558 |
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218 | any_read_source::read_coro( |
| 559 | any_read_source*, | ||
| 560 | S& source, | ||
| 561 | std::span<mutable_buffer const> bufs, | ||
| 562 | std::error_code* out_ec, | ||
| 563 | std::size_t* out_n) | ||
| 564 | { | ||
| 565 | auto [err, bytes] = co_await source.read(bufs); | ||
| 566 | |||
| 567 | *out_ec = err; | ||
| 568 | *out_n = bytes; | ||
| 569 | 436 | } | |
| 570 | |||
| 571 | #if defined(__GNUC__) && !defined(__clang__) | ||
| 572 | #pragma GCC diagnostic pop | ||
| 573 | #endif | ||
| 574 | |||
| 575 | template<ReadSource S> | ||
| 576 | coro | ||
| 577 | 130 | any_read_source::do_read_impl( | |
| 578 | void* source, | ||
| 579 | any_read_source* wrapper, | ||
| 580 | std::span<mutable_buffer const> buffers, | ||
| 581 | coro h, | ||
| 582 | executor_ref ex, | ||
| 583 | std::stop_token token, | ||
| 584 | std::error_code* ec, | ||
| 585 | std::size_t* n) | ||
| 586 | { | ||
| 587 | 130 | auto& s = *static_cast<S*>(source); | |
| 588 | |||
| 589 | // Create coroutine - frame is cached in wrapper | ||
| 590 |
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130 | auto op = read_coro<S>(wrapper, s, buffers, ec, n); |
| 591 | |||
| 592 | // Set executor and stop token on promise before resuming | ||
| 593 | 130 | op.h_.promise().set_executor(ex); | |
| 594 | 130 | op.h_.promise().set_stop_token(token); | |
| 595 | |||
| 596 | // Resume the coroutine to start the operation | ||
| 597 |
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130 | op.h_.resume(); |
| 598 | |||
| 599 | // Check if operation completed synchronously | ||
| 600 |
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99 | if(op.h_.done()) |
| 601 | { | ||
| 602 |
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99 | op.h_.destroy(); |
| 603 | 99 | op.h_ = nullptr; | |
| 604 |
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99 | return ex.dispatch(h); |
| 605 | } | ||
| 606 | |||
| 607 | // Operation is pending - caller will be resumed via symmetric transfer | ||
| 608 | ✗ | op.h_.promise().set_caller(h); | |
| 609 | ✗ | op.h_ = nullptr; | |
| 610 | ✗ | return std::noop_coroutine(); | |
| 611 | 130 | } | |
| 612 | |||
| 613 | //---------------------------------------------------------- | ||
| 614 | |||
| 615 | inline auto | ||
| 616 | 130 | any_read_source::read_some_(std::span<mutable_buffer const> buffers) | |
| 617 | { | ||
| 618 | struct awaitable | ||
| 619 | { | ||
| 620 | any_read_source* self_; | ||
| 621 | std::span<mutable_buffer const> buffers_; | ||
| 622 | std::error_code ec_; | ||
| 623 | std::size_t n_ = 0; | ||
| 624 | |||
| 625 | bool | ||
| 626 | 130 | await_ready() const noexcept | |
| 627 | { | ||
| 628 | 130 | return false; | |
| 629 | } | ||
| 630 | |||
| 631 | coro | ||
| 632 | 130 | await_suspend(coro h, executor_ref ex, std::stop_token token) | |
| 633 | { | ||
| 634 | 260 | return self_->vt_->do_read( | |
| 635 |
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130 | self_->source_, |
| 636 | self_, | ||
| 637 | buffers_, | ||
| 638 | h, | ||
| 639 | ex, | ||
| 640 | token, | ||
| 641 | &ec_, | ||
| 642 | 198 | &n_); | |
| 643 | } | ||
| 644 | |||
| 645 | io_result<std::size_t> | ||
| 646 | 99 | await_resume() const noexcept | |
| 647 | { | ||
| 648 | 99 | return {ec_, n_}; | |
| 649 | } | ||
| 650 | }; | ||
| 651 | 130 | return awaitable{this, buffers, {}, 0}; | |
| 652 | } | ||
| 653 | |||
| 654 | template<MutableBufferSequence MB> | ||
| 655 | task<io_result<std::size_t>> | ||
| 656 |
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106 | any_read_source::read(MB buffers) |
| 657 | { | ||
| 658 | buffer_param<MB> bp(std::move(buffers)); | ||
| 659 | std::size_t total = 0; | ||
| 660 | |||
| 661 | for(;;) | ||
| 662 | { | ||
| 663 | auto bufs = bp.data(); | ||
| 664 | if(bufs.empty()) | ||
| 665 | break; | ||
| 666 | |||
| 667 | auto [ec, n] = co_await read_some_(bufs); | ||
| 668 | total += n; | ||
| 669 | if(ec) | ||
| 670 | co_return {ec, total}; | ||
| 671 | bp.consume(n); | ||
| 672 | } | ||
| 673 | |||
| 674 | co_return {{}, total}; | ||
| 675 | 212 | } | |
| 676 | |||
| 677 | } // namespace capy | ||
| 678 | } // namespace boost | ||
| 679 | |||
| 680 | #endif | ||
| 681 |