forked from ngaut/unistore
/
sst_file_writer.go
115 lines (98 loc) · 3.21 KB
/
sst_file_writer.go
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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).
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
// Copyright 2019-present PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
// Copyright 2019-present PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package rocksdb
import (
"os"
"github.com/pingcap/badger/y"
"github.com/pingcap/errors"
)
var (
ErrKeyOrder = errors.New("Keys must be added in order")
ErrNotSupportType = errors.New("Value type is not supported")
)
const (
propExternalSstFileVersion = "rocksdb.external_sst_file.version"
propGlobalSeqNo = "rocksdb.external_sst_file.global_seqno"
)
type SstFileWriter struct {
file *os.File
builder *BlockBasedTableBuilder
lastKey []byte
comparator Comparator
}
func NewSstFileWriter(f *os.File, opts *BlockBasedTableOptions) *SstFileWriter {
w := new(SstFileWriter)
opts.PropsInjectors = append(opts.PropsInjectors, func(builder *PropsBlockBuilder) {
builder.AddUint64(propExternalSstFileVersion, 2)
builder.AddUint64(propGlobalSeqNo, 0)
})
w.file = f
w.builder = NewBlockBasedTableBuilder(f, opts)
w.comparator = opts.Comparator
return w
}
func (w *SstFileWriter) Put(key, value []byte) error {
return w.add(key, value, TypeValue)
}
func (w *SstFileWriter) Merge(key, value []byte) error {
return w.add(key, value, TypeMerge)
}
func (w *SstFileWriter) Delete(key []byte) error {
return w.add(key, nil, TypeDeletion)
}
func (w *SstFileWriter) Finish() error {
return w.builder.Finish()
}
func (w *SstFileWriter) add(key, value []byte, tp ValueType) error {
if !tp.IsValue() {
return ErrNotSupportType
}
if w.lastKey != nil {
if w.comparator(key, w.lastKey) <= 0 {
return ErrKeyOrder
}
}
ikey := InternalKey{
UserKey: key,
SequenceNumber: 0,
ValueType: tp,
}
if err := w.builder.Add(ikey.Encode(), value); err != nil {
return err
}
w.lastKey = y.SafeCopy(w.lastKey, key)
return nil
}
func (w *SstFileWriter) Close() error {
return w.file.Close()
}