/
segment_builder.go
121 lines (111 loc) · 3.33 KB
/
segment_builder.go
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// Copyright (c) 2016 Couchbase, 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, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
// express or implied. See the License for the specific language
// governing permissions and limitations under the License.
package cellar
import (
"fmt"
"os"
"github.com/boltdb/bolt"
)
type segmentBuilder struct {
db *bolt.DB
tx *bolt.Tx
mutations *bolt.Bucket
deletions *bolt.Bucket
metadata *bolt.Bucket
}
func newSegmentBuilder(cellarPath string, seq uint64) (*segmentBuilder, error) {
path := fmt.Sprintf("%s/%s%016x", cellarPath, segmentPrefix, seq)
db, err := bolt.Open(path, 0600, nil)
if err != nil {
return nil, fmt.Errorf("newSegmentBuilder Open: %v", err)
}
// set no-sync since we're bulk loading it
db.NoSync = true
// try to start a write transaction
tx, err := db.Begin(true)
if err != nil {
return nil, fmt.Errorf("newSegmentBuilder Begin: %v", err)
}
mutations, err := tx.CreateBucketIfNotExists(mutationsBucketName)
if err != nil {
return nil, fmt.Errorf("newSegmentBuilder CreateBucketIfNotExists '%s': %v", mutationsBucketName, err)
}
mutations.FillPercent = 1.0
deletions, err := tx.CreateBucketIfNotExists(deletionsBucketName)
if err != nil {
return nil, fmt.Errorf("newSegmentBuilder CreateBucketIfNotExists '%s': %v", deletionsBucketName, err)
}
deletions.FillPercent = 1.0
metadata, err := tx.CreateBucketIfNotExists(metaBucketName)
if err != nil {
return nil, fmt.Errorf("newSegmentBuilder CreateBucketIfNotExists '%s': %v", metaBucketName, err)
}
err = metadata.Put(seqKeyName, []byte(fmt.Sprintf("%016x", seq)))
if err != nil {
return nil, fmt.Errorf("newSegmentBuilder Put '%s': %v", seqKeyName, err)
}
return &segmentBuilder{
db: db,
tx: tx,
mutations: mutations,
deletions: deletions,
metadata: metadata,
}, nil
}
func (s *segmentBuilder) Put(key, val []byte) error {
err := s.mutations.Put(key, val)
if err != nil {
return fmt.Errorf("segmentBuilder Put: %v", err)
}
return nil
}
func (s *segmentBuilder) PutMetadata(key, val []byte) error {
err := s.metadata.Put(key, val)
if err != nil {
return fmt.Errorf("segmentBuilder PutMetadata: %v", err)
}
return nil
}
func (s *segmentBuilder) Delete(key []byte) error {
err := s.deletions.Put(key, []byte{})
if err != nil {
return fmt.Errorf("segmentBuilder Delete: %v", err)
}
return nil
}
func (s *segmentBuilder) Build() error {
err := s.tx.Commit()
if err != nil {
return fmt.Errorf("segmentBuilder Build Commit: %v", err)
}
err = s.db.Close()
if err != nil {
return fmt.Errorf("segmentBuilder Build Close: %v", err)
}
return nil
}
func (s *segmentBuilder) Abort() error {
cleanupPath := s.db.Path()
err := s.tx.Rollback()
if err != nil {
return fmt.Errorf("segmentBuilder Abort Rollback: %v", err)
}
err = s.db.Close()
if err != nil {
return fmt.Errorf("segmentBuilder Abort Close: %v", err)
}
err = os.Remove(cleanupPath)
if err != nil {
return fmt.Errorf("segmentBuilder Abort Remove: %v", err)
}
return nil
}