68 lines
2.3 KiB
Go
68 lines
2.3 KiB
Go
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// Copyright 2023 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>
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package trienode
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import "github.com/ethereum/go-ethereum/common"
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// Node is a wrapper which contains the encoded blob of the trie node and its
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// unique hash identifier. It is general enough that can be used to represent
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// trie nodes corresponding to different trie implementations.
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type Node struct {
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Hash common.Hash // Node hash, empty for deleted node
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Blob []byte // Encoded node blob, nil for the deleted node
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}
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// Size returns the total memory size used by this node.
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func (n *Node) Size() int {
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return len(n.Blob) + common.HashLength
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}
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// IsDeleted returns the indicator if the node is marked as deleted.
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func (n *Node) IsDeleted() bool {
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return n.Hash == (common.Hash{})
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}
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// WithPrev wraps the Node with the previous node value attached.
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type WithPrev struct {
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*Node
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Prev []byte // Encoded original value, nil means it's non-existent
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}
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// Unwrap returns the internal Node object.
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func (n *WithPrev) Unwrap() *Node {
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return n.Node
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}
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// Size returns the total memory size used by this node. It overloads
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// the function in Node by counting the size of previous value as well.
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func (n *WithPrev) Size() int {
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return n.Node.Size() + len(n.Prev)
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}
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// New constructs a node with provided node information.
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func New(hash common.Hash, blob []byte) *Node {
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return &Node{Hash: hash, Blob: blob}
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}
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// NewWithPrev constructs a node with provided node information.
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func NewWithPrev(hash common.Hash, blob []byte, prev []byte) *WithPrev {
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return &WithPrev{
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Node: New(hash, blob),
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Prev: prev,
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}
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}
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