path: root/ethdb/database.go

package ethdb

import (
    "fmt"

    "github.com/ethereum/go-ethereum/compression/rle"
    "github.com/ethereum/go-ethereum/common"
    "github.com/syndtr/goleveldb/leveldb"
    "github.com/syndtr/goleveldb/leveldb/iterator"
)

type LDBDatabase struct {
    db   *leveldb.DB
    comp bool
}

func NewLDBDatabase(file string) (*LDBDatabase, error) {
    // Open the db
    db, err := leveldb.OpenFile(file, nil)
    if err != nil {
        return nil, err
    }
    database := &LDBDatabase{db: db, comp: true}
    return database, nil
}

func (self *LDBDatabase) Put(key []byte, value []byte) {
    if self.comp {
        value = rle.Compress(value)
    }

    err := self.db.Put(key, value, nil)
    if err != nil {
        fmt.Println("Error put", err)
    }
}

func (self *LDBDatabase) Get(key []byte) ([]byte, error) {
    dat, err := self.db.Get(key, nil)
    if err != nil {
        return nil, err
    }

    if self.comp {
        return rle.Decompress(dat)
    }

    return dat, nil
}

func (self *LDBDatabase) Delete(key []byte) error {
    return self.db.Delete(key, nil)
}

func (self *LDBDatabase) LastKnownTD() []byte {
    data, _ := self.Get([]byte("LTD"))

    if len(data) == 0 {
        data = []byte{0x0}
    }

    return data
}

func (self *LDBDatabase) NewIterator() iterator.Iterator {
    return self.db.NewIterator(nil, nil)
}

func (self *LDBDatabase) Write(batch *leveldb.Batch) error {
    return self.db.Write(batch, nil)
}

func (self *LDBDatabase) Close() {
    // Close the leveldb database
    self.db.Close()
}

func (self *LDBDatabase) Print() {
    iter := self.db.NewIterator(nil, nil)
    for iter.Next() {
        key := iter.Key()
        value := iter.Value()

        fmt.Printf("%x(%d): ", key, len(key))
        node := common.NewValueFromBytes(value)
        fmt.Printf("%v\n", node)
    }
}