mirror of https://github.com/facebook/rocksdb.git
86 lines
3.1 KiB
C++
86 lines
3.1 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#include <cinttypes>
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#include <memory>
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#include "file/random_access_file_reader.h"
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#include "rocksdb/compression_type.h"
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#include "rocksdb/rocksdb_namespace.h"
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namespace ROCKSDB_NAMESPACE {
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class Status;
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struct ImmutableCFOptions;
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struct FileOptions;
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class HistogramImpl;
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struct ReadOptions;
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class Slice;
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class PinnableSlice;
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class BlobFileReader {
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public:
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static Status Create(const ImmutableCFOptions& immutable_cf_options,
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const FileOptions& file_options,
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uint32_t column_family_id,
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HistogramImpl* blob_file_read_hist,
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uint64_t blob_file_number,
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const std::shared_ptr<IOTracer>& io_tracer,
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std::unique_ptr<BlobFileReader>* reader);
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BlobFileReader(const BlobFileReader&) = delete;
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BlobFileReader& operator=(const BlobFileReader&) = delete;
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~BlobFileReader();
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Status GetBlob(const ReadOptions& read_options, const Slice& user_key,
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uint64_t offset, uint64_t value_size,
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CompressionType compression_type, PinnableSlice* value,
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uint64_t* bytes_read) const;
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private:
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BlobFileReader(std::unique_ptr<RandomAccessFileReader>&& file_reader,
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uint64_t file_size, CompressionType compression_type);
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static Status OpenFile(const ImmutableCFOptions& immutable_cf_options,
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const FileOptions& file_opts,
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HistogramImpl* blob_file_read_hist,
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uint64_t blob_file_number,
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const std::shared_ptr<IOTracer>& io_tracer,
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uint64_t* file_size,
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std::unique_ptr<RandomAccessFileReader>* file_reader);
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static Status ReadHeader(const RandomAccessFileReader* file_reader,
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uint32_t column_family_id,
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CompressionType* compression_type);
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static Status ReadFooter(uint64_t file_size,
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const RandomAccessFileReader* file_reader);
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using Buffer = std::unique_ptr<char[]>;
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static Status ReadFromFile(const RandomAccessFileReader* file_reader,
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uint64_t read_offset, size_t read_size,
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Slice* slice, Buffer* buf,
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AlignedBuf* aligned_buf);
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static Status VerifyBlob(const Slice& record_slice, const Slice& user_key,
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uint64_t value_size);
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static Status UncompressBlobIfNeeded(const Slice& value_slice,
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CompressionType compression_type,
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PinnableSlice* value);
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static void SaveValue(const Slice& src, PinnableSlice* dst);
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std::unique_ptr<RandomAccessFileReader> file_reader_;
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uint64_t file_size_;
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CompressionType compression_type_;
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};
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} // namespace ROCKSDB_NAMESPACE
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