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package ethdb
import (
"github.com/ethereum/go-ethereum/compression/rle"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/rcrowley/go-metrics"
"github.com/syndtr/goleveldb/leveldb"
"github.com/syndtr/goleveldb/leveldb/errors"
"github.com/syndtr/goleveldb/leveldb/iterator"
"github.com/syndtr/goleveldb/leveldb/opt"
)
var OpenFileLimit = 64
type LDBDatabase struct {
fn string // filename for reporting
db *leveldb.DB // LevelDB instance
GetMeter metrics.Meter // Meter for measuring the database get request counts
PutMeter metrics.Meter // Meter for measuring the database put request counts
DelMeter metrics.Meter // Meter for measuring the database delete request counts
ReadMeter metrics.Meter // Meter for measuring the database get request data usage
WriteMeter metrics.Meter // Meter for measuring the database put request data usage
}
// NewLDBDatabase returns a LevelDB wrapped object. LDBDatabase does not persist data by
// it self but requires a background poller which syncs every X. `Flush` should be called
// when data needs to be stored and written to disk.
func NewLDBDatabase(file string) (*LDBDatabase, error) {
// Open the db
db, err := leveldb.OpenFile(file, &opt.Options{OpenFilesCacheCapacity: OpenFileLimit})
// check for curruption and attempt to recover
if _, iscorrupted := err.(*errors.ErrCorrupted); iscorrupted {
db, err = leveldb.RecoverFile(file, nil)
}
// (re) check for errors and abort if opening of the db failed
if err != nil {
return nil, err
}
database := &LDBDatabase{
fn: file,
db: db,
}
return database, nil
}
// Put puts the given key / value to the queue
func (self *LDBDatabase) Put(key []byte, value []byte) error {
dat := rle.Compress(value)
if self.PutMeter != nil {
self.PutMeter.Mark(1)
}
if self.WriteMeter != nil {
self.WriteMeter.Mark(int64(len(dat)))
}
return self.db.Put(key, dat, nil)
}
// Get returns the given key if it's present.
func (self *LDBDatabase) Get(key []byte) ([]byte, error) {
dat, err := self.db.Get(key, nil)
if err != nil {
return nil, err
}
if self.GetMeter != nil {
self.GetMeter.Mark(1)
}
if self.ReadMeter != nil {
self.ReadMeter.Mark(int64(len(dat)))
}
return rle.Decompress(dat)
}
// Delete deletes the key from the queue and database
func (self *LDBDatabase) Delete(key []byte) error {
if self.DelMeter != nil {
self.DelMeter.Mark(1)
}
return self.db.Delete(key, nil)
}
func (self *LDBDatabase) NewIterator() iterator.Iterator {
return self.db.NewIterator(nil, nil)
}
// Flush flushes out the queue to leveldb
func (self *LDBDatabase) Flush() error {
return nil
}
func (self *LDBDatabase) Close() {
if err := self.Flush(); err != nil {
glog.V(logger.Error).Infof("error: flush '%s': %v\n", self.fn, err)
}
self.db.Close()
glog.V(logger.Error).Infoln("flushed and closed db:", self.fn)
}
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