298 lines
11 KiB
TypeScript
298 lines
11 KiB
TypeScript
import { Element, MerkleTree, MerkleTreeOptions, PartialMerkleTree } from '../src'
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import { it } from 'mocha'
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import { should } from 'chai'
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import * as assert from 'assert'
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import { createHash } from 'crypto'
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const sha256Hash = (left, right) => createHash('sha256').update(`${left}${right}`).digest('hex')
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describe('PartialMerkleTree', () => {
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const getTestTrees = (levels: number, elements: Element[], edgeIndex: number, treeOptions: MerkleTreeOptions = {}) => {
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const fullTree = new MerkleTree(levels, elements, treeOptions)
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const edge = fullTree.getTreeEdge(edgeIndex)
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const leavesAfterEdge = elements.slice(edge.edgeIndex)
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const partialTree = new PartialMerkleTree(levels, edge, leavesAfterEdge, treeOptions)
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return { fullTree, partialTree }
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}
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describe('#constructor', () => {
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const { fullTree, partialTree } = getTestTrees(20, ['0', '1', '2', '3', '4', '5'], 2)
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it('should initialize merkle tree with same root', () => {
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should().equal(fullTree.root, partialTree.root)
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})
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it('should initialize merkle tree with same leaves count', () => {
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should().equal(fullTree.elements.length, partialTree.elements.length)
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})
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it('should work with optional hash function and zero element', () => {
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const { partialTree, fullTree } = getTestTrees(10, [1, 2, 3, 4, 5, 6], 3, {
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hashFunction: sha256Hash,
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zeroElement: 'zero',
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})
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should().equal(partialTree.root, fullTree.root)
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})
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})
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describe('#insert', () => {
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it('should have equal root to full tree after insertion ', () => {
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const { fullTree, partialTree } = getTestTrees(10, ['0', '1', '2', '3', '4', '5', '6', '7'], 5)
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fullTree.insert('9')
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partialTree.insert('9')
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should().equal(fullTree.root, partialTree.root)
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})
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it('should fail to insert when tree is full', () => {
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const { partialTree } = getTestTrees(3, ['0', '1', '2', '3', '4', '5', '6', '7'], 5)
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const call = () => partialTree.insert('8')
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should().throw(call, 'Tree is full')
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})
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})
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describe('#bulkInsert', () => {
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it('should work like full tree', () => {
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const { fullTree, partialTree } = getTestTrees(20, [1, 2, 3, 4, 5], 2)
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partialTree.bulkInsert([6, 7, 8])
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fullTree.bulkInsert([6, 7, 8])
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should().equal(fullTree.root, partialTree.root)
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})
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it('should give the same result as sequential inserts', () => {
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const initialArray = [
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[1],
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[1, 2],
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[1, 2, 3],
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[1, 2, 3, 4],
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]
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const insertedArray = [
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[11],
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[11, 12],
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[11, 12, 13],
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[11, 12, 13, 14],
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]
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for (const initial of initialArray) {
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for (const inserted of insertedArray) {
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const { partialTree: tree1 } = getTestTrees(10, initial, initial.length - 1)
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const { partialTree: tree2 } = getTestTrees(10, initial, initial.length - 1)
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tree1.bulkInsert(inserted)
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for (const item of inserted) {
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tree2.insert(item)
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}
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should().equal(tree1.root, tree2.root)
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}
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}
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}).timeout(10000)
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it('should fail to insert too many elements', () => {
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const { partialTree } = getTestTrees(2, [1, 2, 3, 4], 2)
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const call = () => partialTree.bulkInsert([5, 6, 7])
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should().throw(call, 'Tree is full')
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})
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it('should bypass empty elements', () => {
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const elements = [1, 2, 3, 4]
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const { partialTree } = getTestTrees(2, elements, 2)
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partialTree.bulkInsert([])
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should().equal(partialTree.elements.length, elements.length, 'No elements inserted')
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})
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})
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describe('#update', () => {
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it('should update last element', () => {
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const { fullTree, partialTree } = getTestTrees(10, [1, 2, 3, 4, 5], 2)
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partialTree.update(4, 42)
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fullTree.update(4, 42)
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should().equal(partialTree.root, fullTree.root)
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})
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it('should update odd element', () => {
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const { fullTree, partialTree } = getTestTrees(10, [1, 2, 3, 4, 5, 6, 7, 8], 2)
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partialTree.update(4, 42)
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fullTree.update(4, 42)
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should().equal(partialTree.root, fullTree.root)
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})
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it('should update even element', () => {
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const { fullTree, partialTree } = getTestTrees(10, [1, 2, 3, 4, 5, 6, 7, 8], 2)
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partialTree.update(3, 42)
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fullTree.update(3, 42)
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should().equal(partialTree.root, fullTree.root)
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})
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it('should update extra element', () => {
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const { fullTree, partialTree } = getTestTrees(10, [1, 2, 3, 4, 5], 2)
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partialTree.update(5, 6)
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fullTree.update(5, 6)
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should().equal(fullTree.root, partialTree.root)
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})
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it('should fail to update incorrect index', () => {
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const { partialTree } = getTestTrees(10, [1, 2, 3, 4, 5], 3)
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should().throw((() => partialTree.update(-1, 42)), 'Insert index out of bounds: -1')
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should().throw((() => partialTree.update(6, 42)), 'Insert index out of bounds: 6')
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should().throw((() => partialTree.update(2, 42)), 'Index 2 is below the edge: 3')
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// @ts-ignore
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should().throw((() => partialTree.update('qwe', 42)), 'Insert index out of bounds: qwe')
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})
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it('should fail to update over capacity', () => {
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const { partialTree } = getTestTrees(2, [1, 2, 3, 4], 1)
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const call = () => partialTree.update(4, 42)
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should().throw(call, 'Insert index out of bounds: 4')
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})
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})
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describe('#indexOf', () => {
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it('should return same result as full tree', () => {
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const { fullTree, partialTree } = getTestTrees(10, [1, 2, 3, 4, 5, 6, 7, 8], 3)
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should().equal(partialTree.indexOf(5), fullTree.indexOf(5))
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})
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it('should find index', () => {
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const { partialTree } = getTestTrees(10, [1, 2, 3, 4, 5], 2)
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should().equal(partialTree.indexOf(3), 2)
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})
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it('should work with comparator', () => {
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const { partialTree } = getTestTrees(10, [1, 2, 3, 4, 5], 2)
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should().equal(partialTree.indexOf(4, (arg0, arg1) => arg0 === arg1), 3)
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})
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it('should return -1 for non existent element', () => {
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const { partialTree } = getTestTrees(10, [1, 2, 3, 4, 5], 2)
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should().equal(partialTree.indexOf(42), -1)
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})
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})
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describe('#proof', () => {
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it('should return proof for known leaf', () => {
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const { partialTree } = getTestTrees(10, [1, 2, 3, 4, 5], 2)
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assert.deepEqual(partialTree.proof(4), partialTree.path(3))
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})
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})
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describe('#getters', () => {
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it('should return capacity', () => {
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const levels = 10
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const capacity = 2 ** levels
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const { fullTree, partialTree } = getTestTrees(levels, [1, 2, 3, 4, 5], 2)
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should().equal(fullTree.capacity, capacity)
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should().equal(partialTree.capacity, capacity)
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})
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it('should return same elements count as full tree', () => {
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const levels = 10
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const capacity = 2 ** levels
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const elements = Array.from({ length: capacity }, (_, i) => i)
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const { fullTree, partialTree } = getTestTrees(levels, elements, 200)
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should().equal(partialTree.elements.length, fullTree.elements.length)
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})
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it('should return copy of layers', () => {
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const { partialTree } = getTestTrees(10, [1, 2, 3, 4, 5], 2)
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const layers = partialTree.layers
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should().not.equal(layers, partialTree.layers)
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})
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it('should return copy of zeros', () => {
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const { partialTree } = getTestTrees(10, [1, 2, 3, 4, 5], 2)
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const zeros = partialTree.zeros
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should().not.equal(zeros, partialTree.zeros)
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})
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it('should return edge leaf', () => {
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const { partialTree } = getTestTrees(10, [1, 2, 3, 4, 5], 2)
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should().equal(partialTree.edgeElement, 3)
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})
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})
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describe('#path', () => {
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it('should return path for known nodes', () => {
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const levels = 10
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const capacity = 2 ** levels
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const elements = Array.from({ length: capacity / 2 }, (_, i) => i)
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const { fullTree, partialTree } = getTestTrees(levels, elements, 250)
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assert.deepEqual(fullTree.path(251), partialTree.path(251))
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}).timeout(1000)
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it('should fail on incorrect index', () => {
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const { partialTree } = getTestTrees(10, [1, 2, 3, 4, 5, 6, 7, 8, 9], 4)
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should().throw((() => partialTree.path(-1)), 'Index out of bounds: -1')
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should().throw((() => partialTree.path(10)), 'Index out of bounds: 10')
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// @ts-ignore
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should().throw((() => partialTree.path('qwe')), 'Index out of bounds: qwe')
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})
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it('should fail if index is below edge', () => {
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const { partialTree } = getTestTrees(10, [1, 2, 3, 4, 5, 6, 7, 8, 9], 4)
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const call = () => partialTree.path(2)
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should().throw(call, 'Index 2 is below the edge: 4')
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})
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})
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describe('#shiftEdge', () => {
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const levels = 20
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const elements: Element[] = Array.from({ length: 2 ** 18 }, (_, i) => i)
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const tree = new MerkleTree(levels, elements)
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it('should work', () => {
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const edge1 = tree.getTreeEdge(200)
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const edge2 = tree.getTreeEdge(100)
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const partialTree = new PartialMerkleTree(levels, edge1, elements.slice(edge1.edgeIndex))
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partialTree.shiftEdge(edge2, elements.slice(edge2.edgeIndex, partialTree.edgeIndex))
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tree.insert('1111')
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partialTree.insert('1111')
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assert.deepEqual(partialTree.path(150), tree.path(150))
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})
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it('should be able to build full tree from slices', () => {
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const slices = tree.getTreeSlices(6)
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const lastSlice = slices.pop()
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const partialTree = new PartialMerkleTree(levels, lastSlice.edge, lastSlice.elements)
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for (let i = slices.length - 1; i >= 0; i--) {
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partialTree.shiftEdge(slices[i].edge, slices[i].elements)
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}
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partialTree.insert('1')
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tree.insert('1')
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assert.deepStrictEqual(partialTree.path(432), tree.path(432))
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}).timeout(10000)
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it('should fail if new edge index is over current edge', () => {
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const { fullTree, partialTree } = getTestTrees(10, [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], 4)
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const newEdge = fullTree.getTreeEdge(4)
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const call = () => partialTree.shiftEdge(newEdge, [1, 2])
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should().throw(call, 'New edgeIndex should be smaller then 4')
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})
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it('should fail if elements length are incorrect', () => {
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const { fullTree, partialTree } = getTestTrees(10, [1, 2, 3, 4, 5, 6, 7, 8, 9], 4)
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const newEdge = fullTree.getTreeEdge(3)
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const call = () => partialTree.shiftEdge(newEdge, [1, 2])
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should().throw(call, 'Elements length should be 1')
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})
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})
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describe('#serialize', () => {
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it('should work', () => {
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const { partialTree } = getTestTrees(5, [1, 2, 3, 4, 5, 6, 7, 8, 9], 5)
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const data = partialTree.serialize()
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const dst = PartialMerkleTree.deserialize(data)
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should().equal(partialTree.root, dst.root)
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partialTree.insert(10)
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dst.insert(10)
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assert.deepStrictEqual(partialTree.path(6), dst.path(6))
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should().equal(partialTree.root, dst.root)
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})
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})
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describe('#toString', () => {
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it('should return correct stringified representation', () => {
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const { partialTree } = getTestTrees(5, [1, 2, 3, 4, 5, 6, 7, 8, 9], 5)
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const str = partialTree.toString()
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const dst = PartialMerkleTree.deserialize(JSON.parse(str))
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assert.deepStrictEqual(partialTree.path(6), dst.path(6))
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partialTree.insert(10)
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dst.insert(10)
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assert.deepStrictEqual(partialTree.path(6), dst.path(6))
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assert.deepStrictEqual(partialTree.root, dst.root)
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})
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})
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})
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