mirror of https://github.com/facebook/rocksdb.git
424 lines
11 KiB
C++
424 lines
11 KiB
C++
// 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_file_reader.h"
|
|
|
|
#include <cassert>
|
|
#include <string>
|
|
|
|
#include "db/blob/blob_log_format.h"
|
|
#include "file/filename.h"
|
|
#include "options/cf_options.h"
|
|
#include "rocksdb/file_system.h"
|
|
#include "rocksdb/slice.h"
|
|
#include "rocksdb/status.h"
|
|
#include "test_util/sync_point.h"
|
|
#include "util/compression.h"
|
|
#include "util/crc32c.h"
|
|
|
|
namespace ROCKSDB_NAMESPACE {
|
|
|
|
Status BlobFileReader::Create(
|
|
const ImmutableCFOptions& immutable_cf_options,
|
|
const FileOptions& file_options, uint32_t column_family_id,
|
|
HistogramImpl* blob_file_read_hist, uint64_t blob_file_number,
|
|
std::unique_ptr<BlobFileReader>* blob_file_reader) {
|
|
assert(blob_file_reader);
|
|
assert(!*blob_file_reader);
|
|
|
|
uint64_t file_size = 0;
|
|
std::unique_ptr<RandomAccessFileReader> file_reader;
|
|
|
|
{
|
|
const Status s =
|
|
OpenFile(immutable_cf_options, file_options, blob_file_read_hist,
|
|
blob_file_number, &file_size, &file_reader);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
assert(file_reader);
|
|
|
|
CompressionType compression_type = kNoCompression;
|
|
|
|
{
|
|
const Status s =
|
|
ReadHeader(file_reader.get(), column_family_id, &compression_type);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
{
|
|
const Status s = ReadFooter(file_size, file_reader.get());
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
blob_file_reader->reset(
|
|
new BlobFileReader(std::move(file_reader), file_size, compression_type));
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
Status BlobFileReader::OpenFile(
|
|
const ImmutableCFOptions& immutable_cf_options,
|
|
const FileOptions& file_opts, HistogramImpl* blob_file_read_hist,
|
|
uint64_t blob_file_number, uint64_t* file_size,
|
|
std::unique_ptr<RandomAccessFileReader>* file_reader) {
|
|
assert(file_size);
|
|
assert(file_reader);
|
|
|
|
const auto& cf_paths = immutable_cf_options.cf_paths;
|
|
assert(!cf_paths.empty());
|
|
|
|
const std::string blob_file_path =
|
|
BlobFileName(cf_paths.front().path, blob_file_number);
|
|
|
|
FileSystem* const fs = immutable_cf_options.fs;
|
|
assert(fs);
|
|
|
|
constexpr IODebugContext* dbg = nullptr;
|
|
|
|
{
|
|
TEST_SYNC_POINT("BlobFileReader::OpenFile:GetFileSize");
|
|
|
|
const Status s =
|
|
fs->GetFileSize(blob_file_path, IOOptions(), file_size, dbg);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
if (*file_size < BlobLogHeader::kSize + BlobLogFooter::kSize) {
|
|
return Status::Corruption("Malformed blob file");
|
|
}
|
|
|
|
std::unique_ptr<FSRandomAccessFile> file;
|
|
|
|
{
|
|
TEST_SYNC_POINT("BlobFileReader::OpenFile:NewRandomAccessFile");
|
|
|
|
const Status s =
|
|
fs->NewRandomAccessFile(blob_file_path, file_opts, &file, dbg);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
assert(file);
|
|
|
|
if (immutable_cf_options.advise_random_on_open) {
|
|
file->Hint(FSRandomAccessFile::kRandom);
|
|
}
|
|
|
|
file_reader->reset(new RandomAccessFileReader(
|
|
std::move(file), blob_file_path, immutable_cf_options.env,
|
|
std::shared_ptr<IOTracer>(), immutable_cf_options.statistics,
|
|
BLOB_DB_BLOB_FILE_READ_MICROS, blob_file_read_hist,
|
|
immutable_cf_options.rate_limiter, immutable_cf_options.listeners));
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
Status BlobFileReader::ReadHeader(const RandomAccessFileReader* file_reader,
|
|
uint32_t column_family_id,
|
|
CompressionType* compression_type) {
|
|
assert(file_reader);
|
|
assert(compression_type);
|
|
|
|
Slice header_slice;
|
|
Buffer buf;
|
|
AlignedBuf aligned_buf;
|
|
|
|
{
|
|
TEST_SYNC_POINT("BlobFileReader::ReadHeader:ReadFromFile");
|
|
|
|
constexpr uint64_t read_offset = 0;
|
|
constexpr size_t read_size = BlobLogHeader::kSize;
|
|
|
|
const Status s = ReadFromFile(file_reader, read_offset, read_size,
|
|
&header_slice, &buf, &aligned_buf);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
TEST_SYNC_POINT_CALLBACK("BlobFileReader::ReadHeader:TamperWithResult",
|
|
&header_slice);
|
|
}
|
|
|
|
BlobLogHeader header;
|
|
|
|
{
|
|
const Status s = header.DecodeFrom(header_slice);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
constexpr ExpirationRange no_expiration_range;
|
|
|
|
if (header.has_ttl || header.expiration_range != no_expiration_range) {
|
|
return Status::Corruption("Unexpected TTL blob file");
|
|
}
|
|
|
|
if (header.column_family_id != column_family_id) {
|
|
return Status::Corruption("Column family ID mismatch");
|
|
}
|
|
|
|
*compression_type = header.compression;
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
Status BlobFileReader::ReadFooter(uint64_t file_size,
|
|
const RandomAccessFileReader* file_reader) {
|
|
assert(file_size >= BlobLogHeader::kSize + BlobLogFooter::kSize);
|
|
assert(file_reader);
|
|
|
|
Slice footer_slice;
|
|
Buffer buf;
|
|
AlignedBuf aligned_buf;
|
|
|
|
{
|
|
TEST_SYNC_POINT("BlobFileReader::ReadFooter:ReadFromFile");
|
|
|
|
const uint64_t read_offset = file_size - BlobLogFooter::kSize;
|
|
constexpr size_t read_size = BlobLogFooter::kSize;
|
|
|
|
const Status s = ReadFromFile(file_reader, read_offset, read_size,
|
|
&footer_slice, &buf, &aligned_buf);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
TEST_SYNC_POINT_CALLBACK("BlobFileReader::ReadFooter:TamperWithResult",
|
|
&footer_slice);
|
|
}
|
|
|
|
BlobLogFooter footer;
|
|
|
|
{
|
|
const Status s = footer.DecodeFrom(footer_slice);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
constexpr ExpirationRange no_expiration_range;
|
|
|
|
if (footer.expiration_range != no_expiration_range) {
|
|
return Status::Corruption("Unexpected TTL blob file");
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
Status BlobFileReader::ReadFromFile(const RandomAccessFileReader* file_reader,
|
|
uint64_t read_offset, size_t read_size,
|
|
Slice* slice, Buffer* buf,
|
|
AlignedBuf* aligned_buf) {
|
|
assert(slice);
|
|
assert(buf);
|
|
assert(aligned_buf);
|
|
|
|
assert(file_reader);
|
|
|
|
Status s;
|
|
|
|
if (file_reader->use_direct_io()) {
|
|
constexpr char* scratch = nullptr;
|
|
|
|
s = file_reader->Read(IOOptions(), read_offset, read_size, slice, scratch,
|
|
aligned_buf);
|
|
} else {
|
|
buf->reset(new char[read_size]);
|
|
constexpr AlignedBuf* aligned_scratch = nullptr;
|
|
|
|
s = file_reader->Read(IOOptions(), read_offset, read_size, slice,
|
|
buf->get(), aligned_scratch);
|
|
}
|
|
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
if (slice->size() != read_size) {
|
|
return Status::Corruption("Failed to read data from blob file");
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
BlobFileReader::BlobFileReader(
|
|
std::unique_ptr<RandomAccessFileReader>&& file_reader, uint64_t file_size,
|
|
CompressionType compression_type)
|
|
: file_reader_(std::move(file_reader)),
|
|
file_size_(file_size),
|
|
compression_type_(compression_type) {
|
|
assert(file_reader_);
|
|
}
|
|
|
|
BlobFileReader::~BlobFileReader() = default;
|
|
|
|
Status BlobFileReader::GetBlob(const ReadOptions& read_options,
|
|
const Slice& user_key, uint64_t offset,
|
|
uint64_t value_size,
|
|
CompressionType compression_type,
|
|
PinnableSlice* value) const {
|
|
assert(value);
|
|
|
|
const uint64_t key_size = user_key.size();
|
|
|
|
if (!IsValidBlobOffset(offset, key_size, value_size, file_size_)) {
|
|
return Status::Corruption("Invalid blob offset");
|
|
}
|
|
|
|
if (compression_type != compression_type_) {
|
|
return Status::Corruption("Compression type mismatch when reading blob");
|
|
}
|
|
|
|
// Note: if verify_checksum is set, we read the entire blob record to be able
|
|
// to perform the verification; otherwise, we just read the blob itself. Since
|
|
// the offset in BlobIndex actually points to the blob value, we need to make
|
|
// an adjustment in the former case.
|
|
const uint64_t adjustment =
|
|
read_options.verify_checksums
|
|
? BlobLogRecord::CalculateAdjustmentForRecordHeader(key_size)
|
|
: 0;
|
|
assert(offset >= adjustment);
|
|
|
|
Slice record_slice;
|
|
Buffer buf;
|
|
AlignedBuf aligned_buf;
|
|
|
|
{
|
|
TEST_SYNC_POINT("BlobFileReader::GetBlob:ReadFromFile");
|
|
|
|
const uint64_t record_offset = offset - adjustment;
|
|
const uint64_t record_size = value_size + adjustment;
|
|
|
|
const Status s = ReadFromFile(file_reader_.get(), record_offset,
|
|
static_cast<size_t>(record_size),
|
|
&record_slice, &buf, &aligned_buf);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
TEST_SYNC_POINT_CALLBACK("BlobFileReader::GetBlob:TamperWithResult",
|
|
&record_slice);
|
|
}
|
|
|
|
if (read_options.verify_checksums) {
|
|
const Status s = VerifyBlob(record_slice, user_key, value_size);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
const Slice value_slice(record_slice.data() + adjustment, value_size);
|
|
|
|
{
|
|
const Status s =
|
|
UncompressBlobIfNeeded(value_slice, compression_type, value);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
Status BlobFileReader::VerifyBlob(const Slice& record_slice,
|
|
const Slice& user_key, uint64_t value_size) {
|
|
BlobLogRecord record;
|
|
|
|
const Slice header_slice(record_slice.data(), BlobLogRecord::kHeaderSize);
|
|
|
|
{
|
|
const Status s = record.DecodeHeaderFrom(header_slice);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
if (record.key_size != user_key.size()) {
|
|
return Status::Corruption("Key size mismatch when reading blob");
|
|
}
|
|
|
|
if (record.value_size != value_size) {
|
|
return Status::Corruption("Value size mismatch when reading blob");
|
|
}
|
|
|
|
record.key =
|
|
Slice(record_slice.data() + BlobLogRecord::kHeaderSize, record.key_size);
|
|
if (record.key != user_key) {
|
|
return Status::Corruption("Key mismatch when reading blob");
|
|
}
|
|
|
|
record.value = Slice(record.key.data() + record.key_size, value_size);
|
|
|
|
{
|
|
TEST_SYNC_POINT_CALLBACK("BlobFileReader::VerifyBlob:CheckBlobCRC",
|
|
&record);
|
|
|
|
const Status s = record.CheckBlobCRC();
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
Status BlobFileReader::UncompressBlobIfNeeded(const Slice& value_slice,
|
|
CompressionType compression_type,
|
|
PinnableSlice* value) {
|
|
assert(value);
|
|
|
|
if (compression_type == kNoCompression) {
|
|
SaveValue(value_slice, value);
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
UncompressionContext context(compression_type);
|
|
UncompressionInfo info(context, UncompressionDict::GetEmptyDict(),
|
|
compression_type);
|
|
|
|
size_t uncompressed_size = 0;
|
|
constexpr uint32_t compression_format_version = 2;
|
|
constexpr MemoryAllocator* allocator = nullptr;
|
|
|
|
CacheAllocationPtr output =
|
|
UncompressData(info, value_slice.data(), value_slice.size(),
|
|
&uncompressed_size, compression_format_version, allocator);
|
|
|
|
TEST_SYNC_POINT_CALLBACK(
|
|
"BlobFileReader::UncompressBlobIfNeeded:TamperWithResult", &output);
|
|
|
|
if (!output) {
|
|
return Status::Corruption("Unable to uncompress blob");
|
|
}
|
|
|
|
SaveValue(Slice(output.get(), uncompressed_size), value);
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
void BlobFileReader::SaveValue(const Slice& src, PinnableSlice* dst) {
|
|
assert(dst);
|
|
|
|
if (dst->IsPinned()) {
|
|
dst->Reset();
|
|
}
|
|
|
|
dst->PinSelf(src);
|
|
}
|
|
|
|
} // namespace ROCKSDB_NAMESPACE
|