/*!
* block.js - block object for hsd
* Copyright (c) 2017-2018, Christopher Jeffrey (MIT License).
* https://github.com/handshake-org/hsd
*/
'use strict';
const assert = require('bsert');
const bio = require('bufio');
const {BufferSet} = require('buffer-map');
const blake2b = require('bcrypto/lib/blake2b');
const merkle = require('bcrypto/lib/mrkl');
const consensus = require('../protocol/consensus');
const AbstractBlock = require('./abstractblock');
const TX = require('./tx');
const MerkleBlock = require('./merkleblock');
const Headers = require('./headers');
const Network = require('../protocol/network');
const util = require('../utils/util');
const {encoding} = bio;
/**
* Block
* Represents a full block.
* @alias module:primitives.Block
* @extends AbstractBlock
*/
class Block extends AbstractBlock {
/**
* Create a block.
* @constructor
* @param {Object} options
*/
constructor(options) {
super();
this.txs = [];
this._raw = null;
this._sizes = null;
if (options)
this.fromOptions(options);
}
/**
* Inject properties from options object.
* @private
* @param {Object} options
*/
fromOptions(options) {
this.parseOptions(options);
if (options.txs) {
assert(Array.isArray(options.txs));
for (const tx of options.txs) {
assert(tx instanceof TX);
this.txs.push(tx);
}
}
return this;
}
/**
* Clear any cached values.
* @param {Boolean?} all - Clear transactions.
*/
refresh(all) {
this._refresh();
this._raw = null;
this._sizes = null;
if (!all)
return this;
for (const tx of this.txs)
tx.refresh();
return this;
}
/**
* Calculate virtual block size.
* @returns {Number} Virtual size.
*/
getVirtualSize() {
const scale = consensus.WITNESS_SCALE_FACTOR;
return (this.getWeight() + scale - 1) / scale | 0;
}
/**
* Calculate block weight.
* @returns {Number} weight
*/
getWeight() {
const {base, witness} = this.getSizes();
const total = base + witness;
return base * (consensus.WITNESS_SCALE_FACTOR - 1) + total;
}
/**
* Get real block size.
* @returns {Number} size
*/
getSize() {
const {base, witness} = this.getSizes();
return base + witness;
}
/**
* Get base block size (without witness).
* @returns {Number} size
*/
getBaseSize() {
const {base} = this.getSizes();
return base;
}
/**
* Test whether the block contains a
* transaction with a non-empty witness.
* @returns {Boolean}
*/
hasWitness() {
for (const tx of this.txs) {
if (tx.hasWitness())
return true;
}
return false;
}
/**
* Test the block's transaction vector against a hash.
* @param {Hash} hash
* @returns {Boolean}
*/
hasTX(hash) {
return this.indexOf(hash) !== -1;
}
/**
* Find the index of a transaction in the block.
* @param {Hash} hash
* @returns {Number} index (-1 if not present).
*/
indexOf(hash) {
for (let i = 0; i < this.txs.length; i++) {
const tx = this.txs[i];
if (tx.hash().equals(hash))
return i;
}
return -1;
}
/**
* Calculate merkle root.
* @returns {Hash}
*/
createMerkleRoot() {
const leaves = [];
for (const tx of this.txs)
leaves.push(tx.hash());
return merkle.createRoot(blake2b, leaves);
}
/**
* Calculate witness root.
* @returns {Hash}
*/
createWitnessRoot() {
const leaves = [];
for (const tx of this.txs)
leaves.push(tx.witnessHash());
return merkle.createRoot(blake2b, leaves);
}
/**
* Retrieve the merkle root from the block header.
* @returns {Hash}
*/
getMerkleRoot() {
return this.merkleRoot;
}
/**
* Do non-contextual verification on the block. Including checking the block
* size, the coinbase and the merkle root. This is consensus-critical.
* @returns {Boolean}
*/
verifyBody() {
const [valid] = this.checkBody();
return valid;
}
/**
* Do non-contextual verification on the block. Including checking the block
* size, the coinbase and the merkle root. This is consensus-critical.
* @returns {Array} [valid, reason, score]
*/
checkBody() {
// Check base size.
if (this.txs.length === 0
|| this.txs.length > consensus.MAX_BLOCK_SIZE
|| this.getBaseSize() > consensus.MAX_BLOCK_SIZE) {
return [false, 'bad-blk-length', 100];
}
// Check block weight.
if (this.getWeight() > consensus.MAX_BLOCK_WEIGHT)
return [false, 'bad-blk-weight', 100];
// Check merkle root.
const merkleRoot = this.createMerkleRoot();
if (merkleRoot.equals(consensus.ZERO_HASH))
return [false, 'bad-txnmrklroot', 100];
if (!merkleRoot.equals(this.merkleRoot))
return [false, 'bad-txnmrklroot', 100];
// Check witness root.
const witnessRoot = this.createWitnessRoot();
if (!witnessRoot.equals(this.witnessRoot))
return [false, 'bad-witnessroot', 100];
// First TX must be a coinbase.
if (this.txs.length === 0 || !this.txs[0].isCoinbase())
return [false, 'bad-cb-missing', 100];
// Test all transactions.
for (let i = 0; i < this.txs.length; i++) {
const tx = this.txs[i];
// The rest of the txs must not be coinbases.
if (i > 0 && tx.isCoinbase())
return [false, 'bad-cb-multiple', 100];
// Sanity checks.
const [valid, reason, score] = tx.checkSanity();
if (!valid)
return [valid, reason, score];
}
return [true, 'valid', 0];
}
/**
* Retrieve the coinbase height from the coinbase input script.
* @returns {Number} height (-1 if not present).
*/
getCoinbaseHeight() {
if (this.txs.length === 0)
return -1;
const cb = this.txs[0];
return cb.locktime;
}
/**
* Get the "claimed" reward by the coinbase.
* @returns {Amount} claimed
*/
getClaimed() {
assert(this.txs.length > 0);
assert(this.txs[0].isCoinbase());
return this.txs[0].getOutputValue();
}
/**
* Get all unique outpoint hashes in the
* block. Coinbases are ignored.
* @returns {Hash[]} Outpoint hashes.
*/
getPrevout() {
const prevout = new BufferSet();
for (let i = 1; i < this.txs.length; i++) {
const tx = this.txs[i];
for (const input of tx.inputs)
prevout.add(input.prevout.hash);
}
return prevout.toArray();
}
/**
* Inspect the block and return a more
* user-friendly representation of the data.
* @param {CoinView} view
* @param {Number} height
* @returns {Object}
*/
format(view, height) {
return {
hash: this.hash().toString('hex'),
height: height != null ? height : -1,
size: this.getSize(),
virtualSize: this.getVirtualSize(),
date: util.date(this.time),
version: this.version.toString(16),
prevBlock: this.prevBlock.toString('hex'),
merkleRoot: this.merkleRoot.toString('hex'),
witnessRoot: this.witnessRoot.toString('hex'),
treeRoot: this.treeRoot.toString('hex'),
reservedRoot: this.reservedRoot.toString('hex'),
time: this.time,
bits: this.bits,
nonce: this.nonce,
extraNonce: this.extraNonce.toString('hex'),
mask: this.mask.toString('hex'),
txs: this.txs.map((tx, i) => {
return tx.format(view, null, i);
})
};
}
/**
* Convert the block to an object suitable
* for JSON serialization.
* @param {Network} network
* @param {CoinView} view
* @param {Number} height
* @param {Number} depth
* @returns {Object}
*/
getJSON(network, view, height, depth) {
network = Network.get(network);
return {
hash: this.hash().toString('hex'),
height: height,
depth: depth,
version: this.version,
prevBlock: this.prevBlock.toString('hex'),
merkleRoot: this.merkleRoot.toString('hex'),
witnessRoot: this.witnessRoot.toString('hex'),
treeRoot: this.treeRoot.toString('hex'),
reservedRoot: this.reservedRoot.toString('hex'),
time: this.time,
bits: this.bits,
nonce: this.nonce,
extraNonce: this.extraNonce.toString('hex'),
mask: this.mask.toString('hex'),
txs: this.txs.map((tx, i) => {
return tx.getJSON(network, view, null, i);
})
};
}
/**
* Inject properties from json object.
* @private
* @param {Object} json
*/
fromJSON(json) {
assert(json, 'Block data is required.');
assert(Array.isArray(json.txs));
this.parseJSON(json);
for (const tx of json.txs)
this.txs.push(TX.fromJSON(tx));
return this;
}
/**
* Inject properties from serialized data.
* @private
* @param {Buffer} data
*/
read(br) {
br.start();
this.readHead(br);
const count = br.readVarint();
let witness = 0;
for (let i = 0; i < count; i++) {
const tx = TX.read(br);
witness += tx._sizes.witness;
this.txs.push(tx);
}
if (!this.mutable) {
const raw = br.endData();
const base = raw.length - witness;
this._raw = raw;
this._sizes = new Sizes(base, witness);
}
return this;
}
/**
* Convert the Block to a MerkleBlock.
* @param {Bloom} filter - Bloom filter for transactions
* to match. The merkle block will contain only the
* matched transactions.
* @returns {MerkleBlock}
*/
toMerkle(filter) {
return MerkleBlock.fromBlock(this, filter);
}
write(bw) {
if (this._raw) {
bw.writeBytes(this._raw);
return bw;
}
this.writeHead(bw);
bw.writeVarint(this.txs.length);
for (const tx of this.txs)
tx.write(bw);
return bw;
}
encode() {
if (this.mutable)
return super.encode();
if (!this._raw)
this._raw = super.encode();
return this._raw;
}
/**
* Convert the block to a headers object.
* @returns {Headers}
*/
toHeaders() {
return Headers.fromBlock(this);
}
/**
* Get real block size with witness.
* @returns {RawBlock}
*/
getSizes() {
if (this._sizes)
return this._sizes;
let base = 0;
let witness = 0;
base += this.sizeHead();
base += encoding.sizeVarint(this.txs.length);
for (const tx of this.txs) {
const sizes = tx.getSizes();
base += sizes.base;
witness += sizes.witness;
}
const sizes = new Sizes(base, witness);
if (!this.mutable)
this._sizes = sizes;
return sizes;
}
/**
* Test whether an object is a Block.
* @param {Object} obj
* @returns {Boolean}
*/
static isBlock(obj) {
return obj instanceof Block;
}
}
/*
* Helpers
*/
class Sizes {
constructor(base, witness) {
this.base = base;
this.witness = witness;
}
}
/*
* Expose
*/
module.exports = Block;