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helpers.go
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helpers.go
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// Copyright (C) 2019-2021, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package database
import (
"encoding/binary"
"errors"
"fmt"
"time"
"github.com/ava-labs/avalanchego/ids"
)
var errWrongSize = errors.New("value has unexpected size")
const (
// kvPairOverhead is an estimated overhead for a kv pair in a database.
kvPairOverhead = 8 // bytes
)
func PutID(db KeyValueWriter, key []byte, val ids.ID) error {
return db.Put(key, val[:])
}
func GetID(db KeyValueReader, key []byte) (ids.ID, error) {
b, err := db.Get(key)
if err != nil {
return ids.ID{}, err
}
return ids.ToID(b)
}
func ParseID(b []byte) (ids.ID, error) {
return ids.ToID(b)
}
func PutUInt64(db KeyValueWriter, key []byte, val uint64) error {
b := PackUInt64(val)
return db.Put(key, b)
}
func GetUInt64(db KeyValueReader, key []byte) (uint64, error) {
b, err := db.Get(key)
if err != nil {
return 0, err
}
return ParseUInt64(b)
}
func PackUInt64(val uint64) []byte {
bytes := make([]byte, 8)
binary.BigEndian.PutUint64(bytes, val)
return bytes
}
func ParseUInt64(b []byte) (uint64, error) {
if len(b) != 8 {
return 0, errWrongSize
}
return binary.BigEndian.Uint64(b), nil
}
func PutUInt32(db KeyValueWriter, key []byte, val uint32) error {
b := PackUInt32(val)
return db.Put(key, b)
}
func GetUInt32(db KeyValueReader, key []byte) (uint32, error) {
b, err := db.Get(key)
if err != nil {
return 0, err
}
return ParseUInt32(b)
}
func PackUInt32(val uint32) []byte {
bytes := make([]byte, 4)
binary.BigEndian.PutUint32(bytes, val)
return bytes
}
func ParseUInt32(b []byte) (uint32, error) {
if len(b) != 4 {
return 0, errWrongSize
}
return binary.BigEndian.Uint32(b), nil
}
func PutTimestamp(db KeyValueWriter, key []byte, val time.Time) error {
valBytes, err := val.MarshalBinary()
if err != nil {
return err
}
return db.Put(key, valBytes)
}
func GetTimestamp(db KeyValueReader, key []byte) (time.Time, error) {
b, err := db.Get(key)
if err != nil {
return time.Time{}, err
}
return ParseTimestamp(b)
}
func ParseTimestamp(b []byte) (time.Time, error) {
val := time.Time{}
if err := val.UnmarshalBinary(b); err != nil {
return time.Time{}, err
}
return val, nil
}
func PutBool(db KeyValueWriter, key []byte, b bool) error {
if b {
return db.Put(key, []byte{1})
}
return db.Put(key, []byte{0})
}
func GetBool(db KeyValueReader, key []byte) (bool, error) {
b, err := db.Get(key)
switch {
case err != nil:
return false, err
case len(b) != 1:
return false, fmt.Errorf("length should be 1 but is %d", len(b))
case b[0] != 0 && b[0] != 1:
return false, fmt.Errorf("should be 0 or 1 but is %v", b[0])
}
return b[0] == 1, nil
}
func Count(db Iteratee) (int, error) {
iterator := db.NewIterator()
defer iterator.Release()
count := 0
for iterator.Next() {
count++
}
return count, iterator.Error()
}
func Size(db Iteratee) (int, error) {
iterator := db.NewIterator()
defer iterator.Release()
size := 0
for iterator.Next() {
size += len(iterator.Key()) + len(iterator.Value()) + kvPairOverhead
}
return size, iterator.Error()
}
func IsEmpty(db Iteratee) (bool, error) {
iterator := db.NewIterator()
defer iterator.Release()
return !iterator.Next(), iterator.Error()
}
func Clear(readerDB Iteratee, deleterDB KeyValueDeleter) error {
return ClearPrefix(readerDB, deleterDB, nil)
}
func ClearPrefix(readerDB Iteratee, deleterDB KeyValueDeleter, prefix []byte) error {
iterator := readerDB.NewIteratorWithPrefix(prefix)
defer iterator.Release()
for iterator.Next() {
key := iterator.Key()
if err := deleterDB.Delete(key); err != nil {
return err
}
}
return iterator.Error()
}