61 lines
No EOL
1.8 KiB
JavaScript
61 lines
No EOL
1.8 KiB
JavaScript
const ChainUtil = require('../chain-util');
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const { DIFFICULTY, MINE_RATE } = require('../config');
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class Block {
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constructor(timestamp, lastHash, hash, data, nonce, difficulty) {
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this.timestamp = timestamp;
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this.lastHash = lastHash;
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this.hash = hash;
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this.data = data;
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this.nonce = nonce;
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this.difficulty = difficulty || DIFFICULTY;
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}
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toString() {
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return `Block -
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Timestamp : ${this.timestamp}
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Last Hash : ${this.lastHash.substring(0, 10)}
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Hash : ${this.hash.substring(0, 10)}
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Nonce : ${this.nonce}
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Difficulty: ${this.difficulty}
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Data : ${this.data}`;
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}
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static genesis() {
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return new this('Genesis time', '-----', 'f1r57-h45h', [], 0, DIFFICULTY);
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}
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static mineBlock(lastBlock, data) {
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let hash, timestamp;
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const lastHash = lastBlock.hash;
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let { difficulty } = lastBlock;
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let nonce = 0;
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do {
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nonce++;
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timestamp = Date.now();
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difficulty = Block.adjustDifficulty(lastBlock, timestamp);
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hash = Block.hash(timestamp, lastHash, data, nonce, difficulty);
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} while (hash.substring(0, difficulty) !== '0'.repeat(difficulty));
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return new this(timestamp, lastHash, hash, data, nonce, difficulty);
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}
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static hash(timestamp, lastHash, data, nonce, difficulty) {
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return ChainUtil.hash(`${timestamp}${lastHash}${data}${nonce}${difficulty}`).toString();
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}
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static blockHash(block) {
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const { timestamp, lastHash, data, nonce, difficulty } = block;
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return Block.hash(timestamp, lastHash, data, nonce, difficulty);
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}
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static adjustDifficulty(lastBlock, currentTime) {
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let { difficulty } = lastBlock;
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difficulty = lastBlock.timestamp + MINE_RATE > currentTime ?
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difficulty + 1 : difficulty - 1;
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return difficulty;
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}
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}
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module.exports = Block; |