path: root/ethdb/database.go

package ethdb

import (
    "fmt"
    "github.com/ethereum/eth-go/ethutil"
    "github.com/syndtr/goleveldb/leveldb"
    "path"
)

type LDBDatabase struct {
    db *leveldb.DB
}

func NewLDBDatabase() (*LDBDatabase, error) {
    dbPath := path.Join(ethutil.Config.ExecPath, "database")

    // Open the db
    db, err := leveldb.OpenFile(dbPath, nil)
    if err != nil {
        return nil, err
    }

    database := &LDBDatabase{db: db}

    return database, nil
}

func (db *LDBDatabase) Put(key []byte, value []byte) {
    err := db.db.Put(key, value, nil)
    if err != nil {
        fmt.Println("Error put", err)
    }
}

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

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

func (db *LDBDatabase) LastKnownTD() []byte {
    data, _ := db.db.Get([]byte("LastKnownTotalDifficulty"), nil)

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

    return data
}

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

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

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