neo-go/pkg/core/mpt/base.go
Roman Khimov 2b53877dff mpt: don't flush nodes already present in the DB
It's just a waste of time.

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
2020-07-30 12:42:15 +03:00

84 lines
1.9 KiB
Go

package mpt
import (
"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
"github.com/nspcc-dev/neo-go/pkg/io"
"github.com/nspcc-dev/neo-go/pkg/util"
)
// BaseNode implements basic things every node needs like caching hash and
// serialized representation. It's a basic node building block intended to be
// included into all node types.
type BaseNode struct {
hash util.Uint256
bytes []byte
hashValid bool
bytesValid bool
isFlushed bool
}
// BaseNodeIface abstracts away basic Node functions.
type BaseNodeIface interface {
Hash() util.Uint256
Type() NodeType
Bytes() []byte
IsFlushed() bool
SetFlushed()
}
// getHash returns a hash of this BaseNode.
func (b *BaseNode) getHash(n Node) util.Uint256 {
if !b.hashValid {
b.updateHash(n)
}
return b.hash
}
// getBytes returns a slice of bytes representing this node.
func (b *BaseNode) getBytes(n Node) []byte {
if !b.bytesValid {
b.updateBytes(n)
}
return b.bytes
}
// updateHash updates hash field for this BaseNode.
func (b *BaseNode) updateHash(n Node) {
if n.Type() == HashT {
panic("can't update hash for hash node")
}
b.hash = hash.DoubleSha256(b.getBytes(n))
b.hashValid = true
}
// updateCache updates hash and bytes fields for this BaseNode.
func (b *BaseNode) updateBytes(n Node) {
buf := io.NewBufBinWriter()
encodeNodeWithType(n, buf.BinWriter)
b.bytes = buf.Bytes()
b.bytesValid = true
}
// invalidateCache sets all cache fields to invalid state.
func (b *BaseNode) invalidateCache() {
b.bytesValid = false
b.hashValid = false
b.isFlushed = false
}
// IsFlushed checks for node flush status.
func (b *BaseNode) IsFlushed() bool {
return b.isFlushed
}
// SetFlushed sets 'flushed' flag to true for this node.
func (b *BaseNode) SetFlushed() {
b.isFlushed = true
}
// encodeNodeWithType encodes node together with it's type.
func encodeNodeWithType(n Node, w *io.BinWriter) {
w.WriteB(byte(n.Type()))
n.EncodeBinary(w)
}