mirror of https://github.com/facebook/rocksdb.git
133 lines
3.9 KiB
C++
133 lines
3.9 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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//
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#include "db/blob/blob_log_sequential_reader.h"
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#include "file/random_access_file_reader.h"
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#include "monitoring/statistics.h"
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#include "util/stop_watch.h"
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namespace ROCKSDB_NAMESPACE {
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BlobLogSequentialReader::BlobLogSequentialReader(
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std::unique_ptr<RandomAccessFileReader>&& file_reader, SystemClock* clock,
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Statistics* statistics)
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: file_(std::move(file_reader)),
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clock_(clock),
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statistics_(statistics),
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next_byte_(0) {}
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BlobLogSequentialReader::~BlobLogSequentialReader() = default;
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Status BlobLogSequentialReader::ReadSlice(uint64_t size, Slice* slice,
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char* buf) {
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assert(slice);
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assert(file_);
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StopWatch read_sw(clock_, statistics_, BLOB_DB_BLOB_FILE_READ_MICROS);
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Status s = file_->Read(IOOptions(), next_byte_, static_cast<size_t>(size),
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slice, buf, nullptr);
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next_byte_ += size;
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if (!s.ok()) {
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return s;
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}
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RecordTick(statistics_, BLOB_DB_BLOB_FILE_BYTES_READ, slice->size());
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if (slice->size() != size) {
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return Status::Corruption("EOF reached while reading record");
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}
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return s;
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}
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Status BlobLogSequentialReader::ReadHeader(BlobLogHeader* header) {
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assert(header);
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assert(next_byte_ == 0);
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static_assert(BlobLogHeader::kSize <= sizeof(header_buf_),
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"Buffer is smaller than BlobLogHeader::kSize");
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Status s = ReadSlice(BlobLogHeader::kSize, &buffer_, header_buf_);
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if (!s.ok()) {
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return s;
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}
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if (buffer_.size() != BlobLogHeader::kSize) {
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return Status::Corruption("EOF reached before file header");
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}
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return header->DecodeFrom(buffer_);
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}
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Status BlobLogSequentialReader::ReadRecord(BlobLogRecord* record,
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ReadLevel level,
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uint64_t* blob_offset) {
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assert(record);
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static_assert(BlobLogRecord::kHeaderSize <= sizeof(header_buf_),
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"Buffer is smaller than BlobLogRecord::kHeaderSize");
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Status s = ReadSlice(BlobLogRecord::kHeaderSize, &buffer_, header_buf_);
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if (!s.ok()) {
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return s;
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}
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if (buffer_.size() != BlobLogRecord::kHeaderSize) {
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return Status::Corruption("EOF reached before record header");
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}
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s = record->DecodeHeaderFrom(buffer_);
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if (!s.ok()) {
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return s;
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}
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uint64_t kb_size = record->key_size + record->value_size;
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if (blob_offset != nullptr) {
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*blob_offset = next_byte_ + record->key_size;
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}
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switch (level) {
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case kReadHeader:
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next_byte_ += kb_size;
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break;
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case kReadHeaderKey:
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record->key_buf.reset(new char[record->key_size]);
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s = ReadSlice(record->key_size, &record->key, record->key_buf.get());
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next_byte_ += record->value_size;
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break;
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case kReadHeaderKeyBlob:
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record->key_buf.reset(new char[record->key_size]);
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s = ReadSlice(record->key_size, &record->key, record->key_buf.get());
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if (s.ok()) {
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record->value_buf.reset(new char[record->value_size]);
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s = ReadSlice(record->value_size, &record->value,
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record->value_buf.get());
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}
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if (s.ok()) {
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s = record->CheckBlobCRC();
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}
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break;
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}
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return s;
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}
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Status BlobLogSequentialReader::ReadFooter(BlobLogFooter* footer) {
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assert(footer);
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static_assert(BlobLogFooter::kSize <= sizeof(header_buf_),
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"Buffer is smaller than BlobLogFooter::kSize");
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Status s = ReadSlice(BlobLogFooter::kSize, &buffer_, header_buf_);
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if (!s.ok()) {
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return s;
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}
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if (buffer_.size() != BlobLogFooter::kSize) {
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return Status::Corruption("EOF reached before file footer");
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}
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return footer->DecodeFrom(buffer_);
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}
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} // namespace ROCKSDB_NAMESPACE
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