/usr/share/gocode/src/github.com/lunny/nodb/store/goleveldb/db.go is in golang-github-lunny-nodb-dev 0.0~git20160621.0.fc1ef06-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 | package goleveldb
import (
"github.com/syndtr/goleveldb/leveldb"
"github.com/syndtr/goleveldb/leveldb/cache"
"github.com/syndtr/goleveldb/leveldb/filter"
"github.com/syndtr/goleveldb/leveldb/opt"
"github.com/syndtr/goleveldb/leveldb/storage"
"github.com/lunny/nodb/config"
"github.com/lunny/nodb/store/driver"
"os"
)
const defaultFilterBits int = 10
type Store struct {
}
func (s Store) String() string {
return DBName
}
type MemStore struct {
}
func (s MemStore) String() string {
return MemDBName
}
type DB struct {
path string
cfg *config.LevelDBConfig
db *leveldb.DB
opts *opt.Options
iteratorOpts *opt.ReadOptions
cache cache.Cache
filter filter.Filter
}
func (s Store) Open(path string, cfg *config.Config) (driver.IDB, error) {
if err := os.MkdirAll(path, os.ModePerm); err != nil {
return nil, err
}
db := new(DB)
db.path = path
db.cfg = &cfg.LevelDB
db.initOpts()
var err error
db.db, err = leveldb.OpenFile(db.path, db.opts)
if err != nil {
return nil, err
}
return db, nil
}
func (s Store) Repair(path string, cfg *config.Config) error {
db, err := leveldb.RecoverFile(path, newOptions(&cfg.LevelDB))
if err != nil {
return err
}
db.Close()
return nil
}
func (s MemStore) Open(path string, cfg *config.Config) (driver.IDB, error) {
db := new(DB)
db.path = path
db.cfg = &cfg.LevelDB
db.initOpts()
var err error
db.db, err = leveldb.Open(storage.NewMemStorage(), db.opts)
if err != nil {
return nil, err
}
return db, nil
}
func (s MemStore) Repair(path string, cfg *config.Config) error {
return nil
}
func (db *DB) initOpts() {
db.opts = newOptions(db.cfg)
db.iteratorOpts = &opt.ReadOptions{}
db.iteratorOpts.DontFillCache = true
}
func newOptions(cfg *config.LevelDBConfig) *opt.Options {
opts := &opt.Options{}
opts.ErrorIfMissing = false
cfg.Adjust()
//opts.BlockCacher = cache.NewLRU(cfg.CacheSize)
opts.BlockCacheCapacity = cfg.CacheSize
//we must use bloomfilter
opts.Filter = filter.NewBloomFilter(defaultFilterBits)
if !cfg.Compression {
opts.Compression = opt.NoCompression
} else {
opts.Compression = opt.SnappyCompression
}
opts.BlockSize = cfg.BlockSize
opts.WriteBuffer = cfg.WriteBufferSize
return opts
}
func (db *DB) Close() error {
return db.db.Close()
}
func (db *DB) Put(key, value []byte) error {
return db.db.Put(key, value, nil)
}
func (db *DB) Get(key []byte) ([]byte, error) {
v, err := db.db.Get(key, nil)
if err == leveldb.ErrNotFound {
return nil, nil
}
return v, nil
}
func (db *DB) Delete(key []byte) error {
return db.db.Delete(key, nil)
}
func (db *DB) NewWriteBatch() driver.IWriteBatch {
wb := &WriteBatch{
db: db,
wbatch: new(leveldb.Batch),
}
return wb
}
func (db *DB) NewIterator() driver.IIterator {
it := &Iterator{
db.db.NewIterator(nil, db.iteratorOpts),
}
return it
}
func (db *DB) Begin() (driver.Tx, error) {
return nil, driver.ErrTxSupport
}
func (db *DB) NewSnapshot() (driver.ISnapshot, error) {
snapshot, err := db.db.GetSnapshot()
if err != nil {
return nil, err
}
s := &Snapshot{
db: db,
snp: snapshot,
}
return s, nil
}
func init() {
driver.Register(Store{})
driver.Register(MemStore{})
}
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