150 lines
3.2 KiB
JavaScript
150 lines
3.2 KiB
JavaScript
'use strict';
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var assert = require('assert');
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var encoding = require('../lib/utils/encoding');
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var BufferReader = require('../lib/utils/reader');
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var crypto = require('../lib/crypto/crypto');
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var util = require('../lib/utils/util');
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var LDB = require('../lib/db/ldb');
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var BN = require('../lib/crypto/bn');
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var DUMMY = Buffer.from([0]);
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var file = process.argv[2];
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var db, batch;
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assert(typeof file === 'string', 'Please pass in a database path.');
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file = file.replace(/\.ldb\/?$/, '');
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db = LDB({
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location: file,
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db: 'leveldb',
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compression: true,
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cacheSize: 32 << 20,
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createIfMissing: false,
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bufferKeys: true
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});
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async function checkVersion() {
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var data, ver;
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console.log('Checking version.');
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data = await db.get('V');
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if (!data)
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return;
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ver = data.readUInt32LE(0, true);
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if (ver !== 1)
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throw Error('DB is version ' + ver + '.');
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}
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function entryFromRaw(data) {
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var p = new BufferReader(data, true);
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var hash = crypto.hash256(p.readBytes(80));
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var entry = {};
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p.seek(-80);
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entry.hash = hash.toString('hex');
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entry.version = p.readU32(); // Technically signed
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entry.prevBlock = p.readHash('hex');
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entry.merkleRoot = p.readHash('hex');
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entry.ts = p.readU32();
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entry.bits = p.readU32();
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entry.nonce = p.readU32();
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entry.height = p.readU32();
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entry.chainwork = new BN(p.readBytes(32), 'le');
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return entry;
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}
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function getEntries() {
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return db.values({
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gte: pair('e', encoding.ZERO_HASH),
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lte: pair('e', encoding.MAX_HASH),
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parse: entryFromRaw
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});
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}
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async function getTip(entry) {
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var state = await db.get('R');
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assert(state);
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var tip = state.toString('hex', 0, 32);
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var data = await db.get(pair('e', tip));
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assert(data);
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return entryFromRaw(data);
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}
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async function isMainChain(entry, tip) {
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if (entry.hash === tip)
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return true;
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if (await db.get(pair('n', entry.hash)))
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return true;
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return false;
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}
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// And this insane function is why we should
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// be indexing tips in the first place!
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async function indexTips() {
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var entries = await getEntries();
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var tip = await getTip();
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var tips = [];
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var orphans = [];
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var prevs = {};
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var i, orphan, entry, main;
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for (i = 0; i < entries.length; i++) {
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entry = entries[i];
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main = await isMainChain(entry, tip.hash);
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if (!main) {
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orphans.push(entry);
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prevs[entry.prevBlock] = true;
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}
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}
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for (i = 0; i < orphans.length; i++) {
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orphan = orphans[i];
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if (!prevs[orphan.hash])
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tips.push(orphan.hash);
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}
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tips.push(tip.hash);
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for (i = 0; i < tips.length; i++) {
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tip = tips[i];
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console.log('Indexing chain tip: %s.', util.revHex(tip));
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batch.put(pair('p', tip), DUMMY);
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}
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}
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function write(data, str, off) {
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if (Buffer.isBuffer(str))
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return str.copy(data, off);
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data.write(str, off, 'hex');
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}
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function pair(prefix, hash) {
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var key = Buffer.allocUnsafe(33);
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if (typeof prefix === 'string')
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prefix = prefix.charCodeAt(0);
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key[0] = prefix;
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write(key, hash, 1);
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return key;
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}
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(async function() {
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await db.open();
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console.log('Opened %s.', file);
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batch = db.batch();
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await checkVersion();
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await indexTips();
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await batch.write();
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})().then(function() {
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console.log('Migration complete.');
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process.exit(0);
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});
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