mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-11-23 13:38:35 +00:00
6b21ad9922
Everywhere including examples, external interop APIs, bindings generators
code and in other valuable places. A couple of `interface{}` usages are
intentionally left in the CHANGELOG.md, documentation and tests.
106 lines
2.5 KiB
Go
106 lines
2.5 KiB
Go
package mpt
|
|
|
|
import (
|
|
"encoding/hex"
|
|
"encoding/json"
|
|
"errors"
|
|
"fmt"
|
|
|
|
"github.com/nspcc-dev/neo-go/pkg/config/limits"
|
|
"github.com/nspcc-dev/neo-go/pkg/io"
|
|
"github.com/nspcc-dev/neo-go/pkg/util"
|
|
)
|
|
|
|
const (
|
|
// maxPathLength is the max length of the extension node key.
|
|
maxPathLength = (limits.MaxStorageKeyLen + 4) * 2
|
|
|
|
// MaxKeyLength is the max length of the key to put in the trie
|
|
// before transforming to nibbles.
|
|
MaxKeyLength = maxPathLength / 2
|
|
)
|
|
|
|
// ExtensionNode represents an MPT's extension node.
|
|
type ExtensionNode struct {
|
|
BaseNode
|
|
key []byte
|
|
next Node
|
|
}
|
|
|
|
var _ Node = (*ExtensionNode)(nil)
|
|
|
|
// NewExtensionNode returns a hash node with the specified key and the next node.
|
|
// Note: since it is a part of a Trie, the key must be mangled, i.e. must contain only bytes with high half = 0.
|
|
func NewExtensionNode(key []byte, next Node) *ExtensionNode {
|
|
return &ExtensionNode{
|
|
key: key,
|
|
next: next,
|
|
}
|
|
}
|
|
|
|
// Type implements Node interface.
|
|
func (e ExtensionNode) Type() NodeType { return ExtensionT }
|
|
|
|
// Hash implements BaseNode interface.
|
|
func (e *ExtensionNode) Hash() util.Uint256 {
|
|
return e.getHash(e)
|
|
}
|
|
|
|
// Bytes implements BaseNode interface.
|
|
func (e *ExtensionNode) Bytes() []byte {
|
|
return e.getBytes(e)
|
|
}
|
|
|
|
// DecodeBinary implements io.Serializable.
|
|
func (e *ExtensionNode) DecodeBinary(r *io.BinReader) {
|
|
sz := r.ReadVarUint()
|
|
if sz > maxPathLength {
|
|
r.Err = fmt.Errorf("extension node key is too big: %d", sz)
|
|
return
|
|
}
|
|
e.key = make([]byte, sz)
|
|
r.ReadBytes(e.key)
|
|
no := new(NodeObject)
|
|
no.DecodeBinary(r)
|
|
e.next = no.Node
|
|
e.invalidateCache()
|
|
}
|
|
|
|
// EncodeBinary implements io.Serializable.
|
|
func (e ExtensionNode) EncodeBinary(w *io.BinWriter) {
|
|
w.WriteVarBytes(e.key)
|
|
encodeBinaryAsChild(e.next, w)
|
|
}
|
|
|
|
// Size implements Node interface.
|
|
func (e *ExtensionNode) Size() int {
|
|
return io.GetVarSize(len(e.key)) + len(e.key) +
|
|
1 + util.Uint256Size // e.next is never empty
|
|
}
|
|
|
|
// MarshalJSON implements the json.Marshaler.
|
|
func (e *ExtensionNode) MarshalJSON() ([]byte, error) {
|
|
m := map[string]any{
|
|
"key": hex.EncodeToString(e.key),
|
|
"next": e.next,
|
|
}
|
|
return json.Marshal(m)
|
|
}
|
|
|
|
// UnmarshalJSON implements the json.Unmarshaler.
|
|
func (e *ExtensionNode) UnmarshalJSON(data []byte) error {
|
|
var obj NodeObject
|
|
if err := obj.UnmarshalJSON(data); err != nil {
|
|
return err
|
|
} else if u, ok := obj.Node.(*ExtensionNode); ok {
|
|
*e = *u
|
|
return nil
|
|
}
|
|
return errors.New("expected extension node")
|
|
}
|
|
|
|
// Clone implements Node interface.
|
|
func (e *ExtensionNode) Clone() Node {
|
|
res := *e
|
|
return &res
|
|
}
|