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