// Copyright (c) 2016 Sandstorm Development Group, Inc. and contributors // Licensed under the MIT License: // // Permission is hereby granted, free of charge, to any person obtaining a copy // of this software and associated documentation files (the "Software"), to deal // in the Software without restriction, including without limitation the rights // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell // copies of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN // THE SOFTWARE. #ifndef KJ_COMPAT_READINESS_IO_H_ #define KJ_COMPAT_READINESS_IO_H_ #include <kj/async-io.h> namespace kj { class ReadyInputStreamWrapper { // Provides readiness-based Async I/O as a wrapper around KJ's standard completion-based API, for // compatibility with libraries that use readiness-based abstractions (e.g. OpenSSL). // // Unfortunately this requires buffering, so is not very efficient. public: ReadyInputStreamWrapper(AsyncInputStream& input); ~ReadyInputStreamWrapper() noexcept(false); KJ_DISALLOW_COPY(ReadyInputStreamWrapper); kj::Maybe<size_t> read(kj::ArrayPtr<byte> dst); // Reads bytes into `dst`, returning the number of bytes read. Returns zero only at EOF. Returns // nullptr if not ready. kj::Promise<void> whenReady(); // Returns a promise that resolves when read() will return non-null. private: AsyncInputStream& input; kj::ForkedPromise<void> pumpTask = nullptr; bool isPumping = false; bool eof = false; kj::ArrayPtr<const byte> content = nullptr; // Points to currently-valid part of `buffer`. byte buffer[8192]; }; class ReadyOutputStreamWrapper { // Provides readiness-based Async I/O as a wrapper around KJ's standard completion-based API, for // compatibility with libraries that use readiness-based abstractions (e.g. OpenSSL). // // Unfortunately this requires buffering, so is not very efficient. public: ReadyOutputStreamWrapper(AsyncOutputStream& output); ~ReadyOutputStreamWrapper() noexcept(false); KJ_DISALLOW_COPY(ReadyOutputStreamWrapper); kj::Maybe<size_t> write(kj::ArrayPtr<const byte> src); // Writes bytes from `src`, returning the number of bytes written. Never returns zero. Returns // nullptr if not ready. kj::Promise<void> whenReady(); // Returns a promise that resolves when write() will return non-null. private: AsyncOutputStream& output; ArrayPtr<const byte> segments[2]; kj::ForkedPromise<void> pumpTask = nullptr; bool isPumping = false; uint start = 0; // index of first byte uint filled = 0; // number of bytes currently in buffer byte buffer[8192]; kj::Promise<void> pump(); // Asyncronously push the buffer out to the underlying stream. }; } // namespace kj #endif // KJ_COMPAT_READINESS_IO_H_