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https://github.com/nspcc-dev/neo-go.git
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115 lines
3.6 KiB
Go
115 lines
3.6 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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STContractID KeyPrefix = 0x51
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STStorage KeyPrefix = 0x70
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// STTempStorage is used to store contract storage items during state sync process
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// in order not to mess up the previous state which has its own items stored by
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// STStorage prefix. Once state exchange process is completed, all items with
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// STStorage prefix will be replaced with STTempStorage-prefixed ones.
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STTempStorage KeyPrefix = 0x71
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STNEP17Transfers KeyPrefix = 0x72
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STNEP17TransferInfo 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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SYSStateSyncCurrentBlockHeight KeyPrefix = 0xc2
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SYSStateSyncPoint KeyPrefix = 0xc3
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SYSStateJumpStage KeyPrefix = 0xc4
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SYSVersion KeyPrefix = 0xf0
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)
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const (
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// MaxStorageKeyLen is the maximum length of a key for storage items.
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MaxStorageKeyLen = 64
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// MaxStorageValueLen is the maximum length of a value for storage items.
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// It is set to be the maximum value for uint16.
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MaxStorageValueLen = 65535
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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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// PutChangeSet allows to push prepared changeset to the Store.
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PutChangeSet(puts map[string][]byte, dels map[string]bool) 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. Seek can guarantee that key-value items are sorted by
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// key in ascending way.
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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. Batches can only be used in a single
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// thread.
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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 "boltdb":
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store, err = NewBoltDBStore(cfg.BoltDBOptions)
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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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