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https://github.com/nspcc-dev/neo-go.git
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097ef2a731
Related to #1468, ported from #1475. We should copy the key to avoid bytes substitution. Otherwise there's a chance that at the end of dao.Store.Seek(...) execution some keys won't be the same as the original keys found inside saveToMap function because storage.Seek can guarantee that provided key and value are only valid until the next `f` call.
101 lines
2.7 KiB
Go
101 lines
2.7 KiB
Go
package storage
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import (
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"encoding/binary"
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"errors"
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"fmt"
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)
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// KeyPrefix constants.
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const (
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DataBlock KeyPrefix = 0x01
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DataTransaction KeyPrefix = 0x02
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DataMPT KeyPrefix = 0x03
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STAccount KeyPrefix = 0x40
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STNotification KeyPrefix = 0x4d
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STContract KeyPrefix = 0x50
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STContractID KeyPrefix = 0x51
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STStorage KeyPrefix = 0x70
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STNEP5Transfers KeyPrefix = 0x72
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STNEP5Balances KeyPrefix = 0x73
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IXHeaderHashList KeyPrefix = 0x80
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SYSCurrentBlock KeyPrefix = 0xc0
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SYSCurrentHeader KeyPrefix = 0xc1
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SYSContractID KeyPrefix = 0xc2
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SYSVersion KeyPrefix = 0xf0
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)
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// ErrKeyNotFound is an error returned by Store implementations
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// when a certain key is not found.
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var ErrKeyNotFound = errors.New("key not found")
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type (
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// Store is anything that can persist and retrieve the blockchain.
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// information.
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Store interface {
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Batch() Batch
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Delete(k []byte) error
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Get([]byte) ([]byte, error)
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Put(k, v []byte) error
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PutBatch(Batch) error
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// Seek can guarantee that provided key (k) and value (v) are the only valid until the next call to f.
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// Key and value slices should not be modified.
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Seek(k []byte, f func(k, v []byte))
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Close() error
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}
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// Batch represents an abstraction on top of batch operations.
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// Each Store implementation is responsible of casting a Batch
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// to its appropriate type.
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Batch interface {
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Delete(k []byte)
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Put(k, v []byte)
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}
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// KeyPrefix is a constant byte added as a prefix for each key
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// stored.
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KeyPrefix uint8
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)
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// Bytes returns the bytes representation of KeyPrefix.
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func (k KeyPrefix) Bytes() []byte {
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return []byte{byte(k)}
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}
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// AppendPrefix appends byteslice b to the given KeyPrefix.
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// AppendKeyPrefix(SYSVersion, []byte{0x00, 0x01})
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func AppendPrefix(k KeyPrefix, b []byte) []byte {
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dest := make([]byte, len(b)+1)
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dest[0] = byte(k)
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copy(dest[1:], b)
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return dest
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}
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// AppendPrefixInt append int n to the given KeyPrefix.
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//AppendPrefixInt(SYSCurrentHeader, 10001)
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func AppendPrefixInt(k KeyPrefix, n int) []byte {
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b := make([]byte, 4)
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binary.LittleEndian.PutUint32(b, uint32(n))
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return AppendPrefix(k, b)
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}
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// NewStore creates storage with preselected in configuration database type.
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func NewStore(cfg DBConfiguration) (Store, error) {
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var store Store
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var err error
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switch cfg.Type {
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case "leveldb":
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store, err = NewLevelDBStore(cfg.LevelDBOptions)
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case "inmemory":
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store = NewMemoryStore()
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case "redis":
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store, err = NewRedisStore(cfg.RedisDBOptions)
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case "boltdb":
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store, err = NewBoltDBStore(cfg.BoltDBOptions)
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case "badgerdb":
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store, err = NewBadgerDBStore(cfg.BadgerDBOptions)
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default:
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return nil, fmt.Errorf("unknown storage: %s", cfg.Type)
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}
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return store, err
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}
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