path: root/ethdb/memory_database.go

package ethdb

import (
    "fmt"
    "github.com/ethereum/eth-go/ethutil"
)

/*
 * This is a test memory database. Do not use for any production it does not get persisted
 */
type MemDatabase struct {
    db map[string][]byte
}

func NewMemDatabase() (*MemDatabase, error) {
    db := &MemDatabase{db: make(map[string][]byte)}

    return db, nil
}

func (db *MemDatabase) Put(key []byte, value []byte) {
    db.db[string(key)] = value
}

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

func (db *MemDatabase) Delete(key []byte) error {
    delete(db.db, string(key))

    return nil
}

func (db *MemDatabase) Print() {
    for key, val := range db.db {
        fmt.Printf("%x(%d): ", key, len(key))
        node := ethutil.NewValueFromBytes(val)
        fmt.Printf("%q\n", node.Interface())
    }
}

func (db *MemDatabase) Close() {
}

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

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

    return data
}