mirror of
https://github.com/nestriness/cdc-file-transfer.git
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09cee120b2
There are no real changes, just moving files around. Sockets will be used in the future to find available ports in cdc_stream. Therefore, they need to be in common.
73 lines
2.2 KiB
C++
73 lines
2.2 KiB
C++
/*
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* Copyright 2022 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef CDC_RSYNC_ZSTD_STREAM_H_
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#define CDC_RSYNC_ZSTD_STREAM_H_
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#include <thread>
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#include "absl/status/status.h"
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#include "absl/synchronization/mutex.h"
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#include "common/buffer.h"
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#include "common/socket.h"
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#include "lib/zstd.h"
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namespace cdc_ft {
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// Streaming compression using zstd.
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class ZstdStream {
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public:
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ZstdStream(Socket* socket, int level, uint32_t num_threads);
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~ZstdStream();
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// Sends the given |data| to the compressor.
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absl::Status Write(const void* data, size_t size) ABSL_LOCKS_EXCLUDED(mutex_);
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// Finishes the stream and flushes all remaining data.
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absl::Status Finish() ABSL_LOCKS_EXCLUDED(mutex_);
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// Flushes internal buffers if no new data is written for longer than this
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// time. This makes sure that no data is stuck in the pipeline if no new input
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// is available. Default is 500 ms.
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void AutoFlushAfter(absl::Duration dur) { auto_flush_period_ = dur; }
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private:
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// Initializes the compressor and related data.
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absl::Status Initialize(int level, uint32_t num_threads)
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ABSL_LOCKS_EXCLUDED(mutex_);
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// Compressor thread, pushes |in_buffer_| to the zstd compressor and sends
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// compressed data to the socket.
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void ThreadCompressorMain() ABSL_LOCKS_EXCLUDED(mutex_);
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Socket* const socket_;
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ZSTD_CCtx* cctx_;
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absl::Mutex mutex_;
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Buffer in_buffer_ ABSL_GUARDED_BY(mutex_);
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bool shutdown_ ABSL_GUARDED_BY(mutex_) = false;
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bool last_chunk_ ABSL_GUARDED_BY(mutex_) = false;
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bool last_chunk_sent_ ABSL_GUARDED_BY(mutex_) = false;
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absl::Status status_ ABSL_GUARDED_BY(mutex_);
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std::thread compressor_thread_;
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absl::Duration auto_flush_period_;
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};
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} // namespace cdc_ft
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#endif // CDC_RSYNC_ZSTD_STREAM_H_
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