mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
synced 2024-12-23 12:07:17 +00:00
101 lines
2.8 KiB
Go
101 lines
2.8 KiB
Go
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)
|
|
}
|