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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
//
#include "db/blob/blob_log_sequential_reader.h"
#include "file/random_access_file_reader.h"
#include "monitoring/statistics.h"
#include "util/stop_watch.h"
namespace ROCKSDB_NAMESPACE {
BlobLogSequentialReader::BlobLogSequentialReader(
std::unique_ptr<RandomAccessFileReader>&& file_reader, SystemClock* clock,
Statistics* statistics)
: file_(std::move(file_reader)),
clock_(clock),
statistics_(statistics),
next_byte_(0) {}
BlobLogSequentialReader::~BlobLogSequentialReader() = default;
Status BlobLogSequentialReader::ReadSlice(uint64_t size, Slice* slice,
char* buf) {
assert(slice);
assert(file_);
StopWatch read_sw(clock_, statistics_, BLOB_DB_BLOB_FILE_READ_MICROS);
// TODO: rate limit `BlobLogSequentialReader` reads (it appears unused?)
Status s =
file_->Read(IOOptions(), next_byte_, static_cast<size_t>(size), slice,
buf, nullptr, Env::IO_TOTAL /* rate_limiter_priority */);
next_byte_ += size;
if (!s.ok()) {
return s;
}
RecordTick(statistics_, BLOB_DB_BLOB_FILE_BYTES_READ, slice->size());
if (slice->size() != size) {
return Status::Corruption("EOF reached while reading record");
}
return s;
}
Status BlobLogSequentialReader::ReadHeader(BlobLogHeader* header) {
assert(header);
assert(next_byte_ == 0);
static_assert(BlobLogHeader::kSize <= sizeof(header_buf_),
"Buffer is smaller than BlobLogHeader::kSize");
Status s = ReadSlice(BlobLogHeader::kSize, &buffer_, header_buf_);
if (!s.ok()) {
return s;
}
if (buffer_.size() != BlobLogHeader::kSize) {
return Status::Corruption("EOF reached before file header");
}
return header->DecodeFrom(buffer_);
}
Status BlobLogSequentialReader::ReadRecord(BlobLogRecord* record,
ReadLevel level,
uint64_t* blob_offset) {
assert(record);
static_assert(BlobLogRecord::kHeaderSize <= sizeof(header_buf_),
"Buffer is smaller than BlobLogRecord::kHeaderSize");
Status s = ReadSlice(BlobLogRecord::kHeaderSize, &buffer_, header_buf_);
if (!s.ok()) {
return s;
}
if (buffer_.size() != BlobLogRecord::kHeaderSize) {
return Status::Corruption("EOF reached before record header");
}
s = record->DecodeHeaderFrom(buffer_);
if (!s.ok()) {
return s;
}
uint64_t kb_size = record->key_size + record->value_size;
if (blob_offset != nullptr) {
*blob_offset = next_byte_ + record->key_size;
}
switch (level) {
case kReadHeader:
next_byte_ += kb_size;
break;
case kReadHeaderKey:
record->key_buf.reset(new char[record->key_size]);
s = ReadSlice(record->key_size, &record->key, record->key_buf.get());
next_byte_ += record->value_size;
break;
case kReadHeaderKeyBlob:
record->key_buf.reset(new char[record->key_size]);
s = ReadSlice(record->key_size, &record->key, record->key_buf.get());
if (s.ok()) {
record->value_buf.reset(new char[record->value_size]);
s = ReadSlice(record->value_size, &record->value,
record->value_buf.get());
}
if (s.ok()) {
s = record->CheckBlobCRC();
}
break;
}
return s;
}
Status BlobLogSequentialReader::ReadFooter(BlobLogFooter* footer) {
assert(footer);
static_assert(BlobLogFooter::kSize <= sizeof(header_buf_),
"Buffer is smaller than BlobLogFooter::kSize");
Status s = ReadSlice(BlobLogFooter::kSize, &buffer_, header_buf_);
if (!s.ok()) {
return s;
}
if (buffer_.size() != BlobLogFooter::kSize) {
return Status::Corruption("EOF reached before file footer");
}
return footer->DecodeFrom(buffer_);
}
} // namespace ROCKSDB_NAMESPACE
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