90 lines
2.3 KiB
Go
90 lines
2.3 KiB
Go
package storage
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import (
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"context"
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"encoding/binary"
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"errors"
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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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STAccount KeyPrefix = 0x40
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STCoin KeyPrefix = 0x44
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STSpentCoin KeyPrefix = 0x45
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STValidator KeyPrefix = 0x48
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STAsset KeyPrefix = 0x4c
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STContract KeyPrefix = 0x50
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STStorage KeyPrefix = 0x70
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IXHeaderHashList KeyPrefix = 0x80
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IXValidatorsCount KeyPrefix = 0x90
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SYSCurrentBlock KeyPrefix = 0xc0
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SYSCurrentHeader KeyPrefix = 0xc1
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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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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(k []byte, f func(k, v []byte))
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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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Put(k, v []byte)
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Len() int
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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 append 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(context context.Context, 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(context, 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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}
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return store, err
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}
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