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rocksdb/utilities/blob_db/blob_log_writer.cc

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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).
//
#ifndef ROCKSDB_LITE
#include "utilities/blob_db/blob_log_writer.h"
#include <cstdint>
#include <limits>
#include <string>
#include "rocksdb/env.h"
#include "util/coding.h"
#include "util/crc32c.h"
#include "util/file_reader_writer.h"
namespace rocksdb {
namespace blob_db {
Writer::Writer(unique_ptr<WritableFileWriter>&& dest, uint64_t log_number,
uint64_t bpsync, bool use_fs, uint64_t boffset)
: dest_(std::move(dest)),
log_number_(log_number),
block_offset_(boffset),
bytes_per_sync_(bpsync),
next_sync_offset_(0),
use_fsync_(use_fs),
last_elem_type_(kEtNone) {
for (int i = 0; i <= kMaxRecordType; i++) {
char t = static_cast<char>(i);
type_crc_[i] = crc32c::Value(&t, 1);
}
}
Writer::~Writer() {}
void Writer::Sync() { dest_->Sync(use_fsync_); }
Status Writer::WriteHeader(const BlobLogHeader& header) {
assert(block_offset_ == 0);
assert(last_elem_type_ == kEtNone);
std::string str;
header.EncodeTo(&str);
Status s = dest_->Append(Slice(str));
if (s.ok()) {
block_offset_ += str.size();
s = dest_->Flush();
}
last_elem_type_ = kEtFileHdr;
return s;
}
Status Writer::AppendFooter(const BlobLogFooter& footer) {
assert(block_offset_ != 0);
assert(last_elem_type_ == kEtFileHdr || last_elem_type_ == kEtFooter);
std::string str;
footer.EncodeTo(&str);
Status s = dest_->Append(Slice(str));
if (s.ok()) {
block_offset_ += str.size();
s = dest_->Close();
dest_.reset();
}
last_elem_type_ = kEtFileFooter;
return s;
}
Status Writer::AddRecord(const Slice& key, const Slice& val,
uint64_t* key_offset, uint64_t* blob_offset,
uint32_t ttl) {
assert(block_offset_ != 0);
assert(last_elem_type_ == kEtFileHdr || last_elem_type_ == kEtFooter);
std::string buf;
ConstructBlobHeader(&buf, key, val, ttl, -1);
Status s = EmitPhysicalRecord(buf, key, val, key_offset, blob_offset);
return s;
}
Status Writer::AddRecord(const Slice& key, const Slice& val,
uint64_t* key_offset, uint64_t* blob_offset) {
assert(block_offset_ != 0);
assert(last_elem_type_ == kEtFileHdr || last_elem_type_ == kEtFooter);
std::string buf;
ConstructBlobHeader(&buf, key, val, -1, -1);
Status s = EmitPhysicalRecord(buf, key, val, key_offset, blob_offset);
return s;
}
void Writer::ConstructBlobHeader(std::string* headerbuf, const Slice& key,
const Slice& val, int32_t ttl, int64_t ts) {
headerbuf->reserve(BlobLogRecord::kHeaderSize);
uint32_t key_size = static_cast<uint32_t>(key.size());
PutFixed32(headerbuf, key_size);
PutFixed64(headerbuf, val.size());
uint32_t ttl_write = (ttl != -1) ? static_cast<uint32_t>(ttl)
: std::numeric_limits<uint32_t>::max();
PutFixed32(headerbuf, ttl_write);
uint64_t ts_write = (ts != -1) ? static_cast<uint64_t>(ts)
: std::numeric_limits<uint64_t>::max();
PutFixed64(headerbuf, ts_write);
RecordType t = kFullType;
headerbuf->push_back(static_cast<char>(t));
RecordSubType st = kRegularType;
if (ttl != -1) st = kTTLType;
headerbuf->push_back(static_cast<char>(st));
uint32_t header_crc = 0;
header_crc =
crc32c::Extend(header_crc, headerbuf->c_str(), headerbuf->size());
header_crc = crc32c::Extend(header_crc, key.data(), key.size());
header_crc = crc32c::Mask(header_crc);
PutFixed32(headerbuf, header_crc);
uint32_t crc = 0;
// Compute the crc of the record type and the payload.
crc = crc32c::Extend(crc, val.data(), val.size());
crc = crc32c::Mask(crc); // Adjust for storage
PutFixed32(headerbuf, crc);
}
Status Writer::EmitPhysicalRecord(const std::string& headerbuf,
const Slice& key, const Slice& val,
uint64_t* key_offset, uint64_t* blob_offset) {
Status s = dest_->Append(Slice(headerbuf));
if (s.ok()) {
s = dest_->Append(key);
if (s.ok()) s = dest_->Append(val);
}
*key_offset = block_offset_ + BlobLogRecord::kHeaderSize;
*blob_offset = *key_offset + key.size();
block_offset_ = *blob_offset + val.size();
last_elem_type_ = kEtRecord;
return s;
}
Status Writer::AddRecordFooter(const SequenceNumber& seq) {
assert(last_elem_type_ == kEtRecord);
std::string buf;
PutFixed64(&buf, seq);
uint32_t footer_crc = crc32c::Extend(0, buf.c_str(), buf.size());
footer_crc = crc32c::Mask(footer_crc);
PutFixed32(&buf, footer_crc);
Status s = dest_->Append(Slice(buf));
block_offset_ += BlobLogRecord::kFooterSize;
if (s.ok()) dest_->Flush();
last_elem_type_ = kEtFooter;
return s;
}
} // namespace blob_db
} // namespace rocksdb
#endif // ROCKSDB_LITE