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