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txdb.js
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txdb.js
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/*!
* txdb.js - persistent transaction pool
* Copyright (c) 2014-2015, Fedor Indutny (MIT License)
* Copyright (c) 2014-2017, Christopher Jeffrey (MIT License).
* https://github.com/bcoin-org/bcoin
*/
'use strict';
const assert = require('bsert');
const bio = require('bufio');
const {BufferSet} = require('buffer-map');
const util = require('../utils/util');
const Amount = require('../btc/amount');
const CoinView = require('../coins/coinview');
const Coin = require('../primitives/coin');
const Outpoint = require('../primitives/outpoint');
const records = require('./records');
const layout = require('./layout').txdb;
const consensus = require('../protocol/consensus');
const policy = require('../protocol/policy');
const {TXRecord} = records;
const {inspectSymbol} = require('../utils');
/**
* TXDB
* @alias module:wallet.TXDB
*/
class TXDB {
/**
* Create a TXDB.
* @constructor
* @param {WalletDB} wdb
* @param {Number} wid
*/
constructor(wdb, wid) {
this.wdb = wdb;
this.db = wdb.db;
this.logger = wdb.logger;
this.wid = wid || 0;
this.bucket = null;
this.wallet = null;
this.locked = new BufferSet();
}
/**
* Open TXDB.
* @returns {Promise}
*/
async open(wallet) {
const prefix = layout.prefix.encode(wallet.wid);
this.wid = wallet.wid;
this.bucket = this.db.bucket(prefix);
this.wallet = wallet;
}
/**
* Emit transaction event.
* @private
* @param {String} event
* @param {Object} data
* @param {Details} details
*/
emit(event, data, details) {
this.wdb.emit(event, this.wallet, data, details);
this.wallet.emit(event, data, details);
}
/**
* Get wallet path for output.
* @param {Output} output
* @returns {Promise} - Returns {@link Path}.
*/
getPath(output) {
const hash = output.getHash();
if (!hash)
return null;
return this.wdb.getPath(this.wid, hash);
}
/**
* Test whether path exists for output.
* @param {Output} output
* @returns {Promise} - Returns Boolean.
*/
hasPath(output) {
const hash = output.getHash();
if (!hash)
return false;
return this.wdb.hasPath(this.wid, hash);
}
/**
* Save credit.
* @param {Batch} b
* @param {Credit} credit
* @param {Path} path
*/
async saveCredit(b, credit, path) {
const {coin} = credit;
b.put(layout.c.encode(coin.hash, coin.index), credit.toRaw());
b.put(layout.C.encode(path.account, coin.hash, coin.index), null);
// if the credit is 'spent', we will remove it
// else we will add it to the 'unspent' bucket
if (credit.spent) {
this.removeUnspentCredit(b, credit, path);
} else {
this.saveUnspentCredit(b, credit, path);
}
return this.addOutpointMap(b, coin.hash, coin.index);
}
/**
* Save unspent credit.
* @param {Credit} credit
* @param {Path} path
*/
saveUnspentCredit(b, credit, path) {
const {coin} = credit;
b.put(
layout.u.encode(path.account, coin.value, coin.hash, coin.index),
credit.toRaw()
);
}
/**
* Remove credit.
* @param {Batch} b
* @param {Credit} credit
* @param {Path} path
*/
async removeCredit(b, credit, path) {
const {coin} = credit;
b.del(layout.c.encode(coin.hash, coin.index));
b.del(layout.C.encode(path.account, coin.hash, coin.index));
// we are sure that the credit is spent
// so we can remove it from the 'unspent' bucket
this.removeUnspentCredit(b, credit, path);
return this.removeOutpointMap(b, coin.hash, coin.index);
}
/**
* Remove spent credit.
* @param {Credit} credit
* @param {Path} path
*/
removeUnspentCredit(b, credit, path) {
const {coin} = credit;
b.del(layout.u.encode(path.account, coin.value, coin.hash, coin.index));
}
/**
* Spend credit.
* @param {Batch} b
* @param {Credit} credit
* @param {TX} tx
* @param {Number} index
*/
spendCredit(b, credit, tx, index) {
const prevout = tx.inputs[index].prevout;
const spender = Outpoint.fromTX(tx, index);
b.put(layout.s.encode(prevout.hash, prevout.index), spender.toRaw());
b.put(layout.d.encode(spender.hash, spender.index), credit.coin.toRaw());
}
/**
* Unspend credit.
* @param {Batch} b
* @param {TX} tx
* @param {Number} index
*/
unspendCredit(b, tx, index) {
const prevout = tx.inputs[index].prevout;
const spender = Outpoint.fromTX(tx, index);
b.del(layout.s.encode(prevout.hash, prevout.index));
b.del(layout.d.encode(spender.hash, spender.index));
}
/**
* Write input record.
* @param {Batch} b
* @param {TX} tx
* @param {Number} index
*/
async writeInput(b, tx, index) {
const prevout = tx.inputs[index].prevout;
const spender = Outpoint.fromTX(tx, index);
b.put(layout.s.encode(prevout.hash, prevout.index), spender.toRaw());
return this.addOutpointMap(b, prevout.hash, prevout.index);
}
/**
* Remove input record.
* @param {Batch} b
* @param {TX} tx
* @param {Number} index
*/
async removeInput(b, tx, index) {
const prevout = tx.inputs[index].prevout;
b.del(layout.s.encode(prevout.hash, prevout.index));
return this.removeOutpointMap(b, prevout.hash, prevout.index);
}
/**
* Update wallet balance.
* @param {Batch} b
* @param {BalanceDelta} state
*/
async updateBalance(b, state) {
const balance = await this.getWalletBalance();
state.applyTo(balance);
b.put(layout.R.encode(), balance.toRaw());
return balance;
}
/**
* Update account balance.
* @param {Batch} b
* @param {Number} acct
* @param {Balance} delta
*/
async updateAccountBalance(b, acct, delta) {
const balance = await this.getAccountBalance(acct);
delta.applyTo(balance);
b.put(layout.r.encode(acct), balance.toRaw());
return balance;
}
/**
* Test a whether a coin has been spent.
* @param {Hash} hash
* @param {Number} index
* @returns {Promise} - Returns Boolean.
*/
async getSpent(hash, index) {
const data = await this.bucket.get(layout.s.encode(hash, index));
if (!data)
return null;
return Outpoint.fromRaw(data);
}
/**
* Test a whether a coin has been spent.
* @param {Hash} hash
* @param {Number} index
* @returns {Promise} - Returns Boolean.
*/
isSpent(hash, index) {
return this.bucket.has(layout.s.encode(hash, index));
}
/**
* Append to global map.
* @param {Batch} b
* @param {Number} height
* @returns {Promise}
*/
addBlockMap(b, height) {
return this.wdb.addBlockMap(b.root(), height, this.wid);
}
/**
* Remove from global map.
* @param {Batch} b
* @param {Number} height
* @returns {Promise}
*/
removeBlockMap(b, height) {
return this.wdb.removeBlockMap(b.root(), height, this.wid);
}
/**
* Append to global map.
* @param {Batch} b
* @param {Hash} hash
* @returns {Promise}
*/
addTXMap(b, hash) {
return this.wdb.addTXMap(b.root(), hash, this.wid);
}
/**
* Remove from global map.
* @param {Batch} b
* @param {Hash} hash
* @returns {Promise}
*/
removeTXMap(b, hash) {
return this.wdb.removeTXMap(b.root(), hash, this.wid);
}
/**
* Append to global map.
* @param {Batch} b
* @param {Hash} hash
* @param {Number} index
* @returns {Promise}
*/
addOutpointMap(b, hash, index) {
return this.wdb.addOutpointMap(b.root(), hash, index, this.wid);
}
/**
* Remove from global map.
* @param {Batch} b
* @param {Hash} hash
* @param {Number} index
* @returns {Promise}
*/
removeOutpointMap(b, hash, index) {
return this.wdb.removeOutpointMap(b.root(), hash, index, this.wid);
}
/**
* List block records.
* @returns {Promise}
*/
getBlocks() {
return this.bucket.keys({
gte: layout.b.min(),
lte: layout.b.max(),
parse: key => layout.b.decode(key)[0]
});
}
/**
* Get block record.
* @param {Number} height
* @returns {Promise}
*/
async getBlock(height) {
const data = await this.bucket.get(layout.b.encode(height));
if (!data)
return null;
return BlockRecord.fromRaw(data);
}
/**
* Append to the global block record.
* @param {Batch} b
* @param {Hash} hash
* @param {BlockMeta} block
* @returns {Promise}
*/
async addBlock(b, hash, block) {
const key = layout.b.encode(block.height);
const data = await this.bucket.get(key);
if (!data) {
const blk = BlockRecord.fromMeta(block);
blk.add(hash);
b.put(key, blk.toRaw());
return;
}
const raw = Buffer.allocUnsafe(data.length + 32);
data.copy(raw, 0);
const size = raw.readUInt32LE(40, true);
raw.writeUInt32LE(size + 1, 40, true);
hash.copy(raw, data.length);
b.put(key, raw);
}
/**
* Remove from the global block record.
* @param {Batch} b
* @param {Hash} hash
* @param {Number} height
* @returns {Promise}
*/
async removeBlock(b, hash, height) {
const key = layout.b.encode(height);
const data = await this.bucket.get(key);
if (!data)
return;
const size = data.readUInt32LE(40, true);
assert(size > 0);
assert(data.slice(-32).equals(hash));
if (size === 1) {
b.del(key);
return;
}
const raw = data.slice(0, -32);
raw.writeUInt32LE(size - 1, 40, true);
b.put(key, raw);
}
/**
* Remove from the global block record.
* @param {Batch} b
* @param {Hash} hash
* @param {Number} height
* @returns {Promise}
*/
async spliceBlock(b, hash, height) {
const block = await this.getBlock(height);
if (!block)
return;
if (!block.remove(hash))
return;
if (block.hashes.size === 0) {
b.del(layout.b.encode(height));
return;
}
b.put(layout.b.encode(height), block.toRaw());
}
/**
* Add transaction without a batch.
* @private
* @param {TX} tx
* @param {BlockMeta} block
* @returns {Promise}
*/
async add(tx, block) {
const hash = tx.hash();
const existing = await this.getTX(hash);
assert(!tx.mutable, 'Cannot add mutable TX to wallet.');
if (existing) {
// Existing tx is already confirmed. Ignore.
if (existing.height !== -1)
return null;
// The incoming tx won't confirm the
// existing one anyway. Ignore.
if (!block)
return null;
// Confirm transaction.
return this.confirm(existing, block);
}
const wtx = TXRecord.fromTX(tx, block);
if (!block) {
// Potentially remove double-spenders.
// Only remove if they're not confirmed.
if (!await this.removeConflicts(tx, true))
return null;
} else {
// Potentially remove double-spenders.
await this.removeConflicts(tx, false);
}
// Finally we can do a regular insertion.
return this.insert(wtx, block);
}
/**
* Insert transaction.
* @private
* @param {TXRecord} wtx
* @param {BlockMeta} block
* @returns {Promise}
*/
async insert(wtx, block) {
const b = this.bucket.batch();
const {tx, hash} = wtx;
const height = block ? block.height : -1;
const details = new Details(wtx, block);
const state = new BalanceDelta();
let own = false;
if (!tx.isCoinbase()) {
// We need to potentially spend some coins here.
for (let i = 0; i < tx.inputs.length; i++) {
const input = tx.inputs[i];
const {hash, index} = input.prevout;
const credit = await this.getCredit(hash, index);
if (!credit) {
// Watch all inputs for incoming txs.
// This allows us to check for double spends.
if (!block)
await this.writeInput(b, tx, i);
continue;
}
const coin = credit.coin;
const path = await this.getPath(coin);
assert(path);
// Build the tx details object
// as we go, for speed.
details.setInput(i, path, coin);
// Write an undo coin for the credit
// and add it to the stxo set.
this.spendCredit(b, credit, tx, i);
// Unconfirmed balance should always
// be updated as it reflects the on-chain
// balance _and_ mempool balance assuming
// everything in the mempool were to confirm.
state.tx(path, 1);
state.coin(path, -1);
state.unconfirmed(path, -coin.value);
if (!block) {
// If the tx is not mined, we do not
// disconnect the coin, we simply mark
// a `spent` flag on the credit. This
// effectively prevents the mempool
// from altering our utxo state
// permanently. It also makes it
// possible to compare the on-chain
// state vs. the mempool state.
credit.spent = true;
await this.saveCredit(b, credit, path);
} else {
// If the tx is mined, we can safely
// remove the coin being spent. This
// coin will be indexed as an undo
// coin so it can be reconnected
// later during a reorg.
state.confirmed(path, -coin.value);
await this.removeCredit(b, credit, path);
}
own = true;
}
}
// Potentially add coins to the utxo set.
for (let i = 0; i < tx.outputs.length; i++) {
const output = tx.outputs[i];
const path = await this.getPath(output);
if (!path)
continue;
details.setOutput(i, path);
const credit = Credit.fromTX(tx, i, height);
credit.own = own;
state.tx(path, 1);
state.coin(path, 1);
state.unconfirmed(path, output.value);
if (block)
state.confirmed(path, output.value);
await this.saveCredit(b, credit, path);
}
// If this didn't update any coins,
// it's not our transaction.
if (!state.updated())
return null;
// Save and index the transaction record.
b.put(layout.t.encode(hash), wtx.toRaw());
b.put(layout.m.encode(wtx.mtime, hash), null);
if (!block)
b.put(layout.p.encode(hash), null);
else
b.put(layout.h.encode(height, hash), null);
// Do some secondary indexing for account-based
// queries. This saves us a lot of time for
// queries later.
for (const [acct, delta] of state.accounts) {
await this.updateAccountBalance(b, acct, delta);
b.put(layout.T.encode(acct, hash), null);
b.put(layout.M.encode(acct, wtx.mtime, hash), null);
if (!block)
b.put(layout.P.encode(acct, hash), null);
else
b.put(layout.H.encode(acct, height, hash), null);
}
// Update block records.
if (block) {
await this.addBlockMap(b, height);
await this.addBlock(b, tx.hash(), block);
} else {
await this.addTXMap(b, hash);
}
// Commit the new state.
const balance = await this.updateBalance(b, state);
await b.write();
// This transaction may unlock some
// coins now that we've seen it.
this.unlockTX(tx);
// Emit events for potential local and
// websocket listeners. Note that these
// will only be emitted if the batch is
// successfully written to disk.
this.emit('tx', tx, details);
this.emit('balance', balance);
return details;
}
/**
* Attempt to confirm a transaction.
* @private
* @param {TXRecord} wtx
* @param {BlockMeta} block
* @returns {Promise}
*/
async confirm(wtx, block) {
const b = this.bucket.batch();
const {tx, hash} = wtx;
const height = block.height;
const details = new Details(wtx, block);
const state = new BalanceDelta();
let own = false;
wtx.setBlock(block);
if (!tx.isCoinbase()) {
const credits = await this.getSpentCredits(tx);
// Potentially spend coins. Now that the tx
// is mined, we can actually _remove_ coins
// from the utxo state.
for (let i = 0; i < tx.inputs.length; i++) {
const input = tx.inputs[i];
const {hash, index} = input.prevout;
let resolved = false;
// There may be new credits available
// that we haven't seen yet.
if (!credits[i]) {
await this.removeInput(b, tx, i);
const credit = await this.getCredit(hash, index);
if (!credit)
continue;
// Add a spend record and undo coin
// for the coin we now know is ours.
// We don't need to remove the coin
// since it was never added in the
// first place.
this.spendCredit(b, credit, tx, i);
credits[i] = credit;
resolved = true;
}
const credit = credits[i];
const coin = credit.coin;
assert(coin.height !== -1);
const path = await this.getPath(coin);
assert(path);
own = true;
details.setInput(i, path, coin);
if (resolved) {
state.coin(path, -1);
state.unconfirmed(path, -coin.value);
}
// We can now safely remove the credit
// entirely, now that we know it's also
// been removed on-chain.
state.confirmed(path, -coin.value);
await this.removeCredit(b, credit, path);
}
}
// Update credit heights, including undo coins.
for (let i = 0; i < tx.outputs.length; i++) {
const output = tx.outputs[i];
const path = await this.getPath(output);
if (!path)
continue;
details.setOutput(i, path);
let credit = await this.getCredit(hash, i);
if (!credit) {
// This credit didn't belong to us the first time we
// saw the transaction (before confirmation or rescan).
// Create new credit for database.
credit = Credit.fromTX(tx, i, height);
// If this tx spent any of our own coins, we "own" this output,
// meaning if it becomes unconfirmed, we can still confidently spend it.
credit.own = own;
// Add coin to "unconfirmed" balance (which includes confirmed coins)
state.coin(path, 1);
state.unconfirmed(path, credit.coin.value);
}
// Credits spent in the mempool add an
// undo coin for ease. If this credit is
// spent in the mempool, we need to
// update the undo coin's height.
if (credit.spent)
await this.updateSpentCoin(b, tx, i, height);
// Update coin height and confirmed
// balance. Save once again.
state.confirmed(path, output.value);
credit.coin.height = height;
await this.saveCredit(b, credit, path);
}
// Save the new serialized transaction as
// the block-related properties have been
// updated. Also reindex for height.
b.put(layout.t.encode(hash), wtx.toRaw());
b.del(layout.p.encode(hash));
b.put(layout.h.encode(height, hash), null);
// Secondary indexing also needs to change.
for (const [acct, delta] of state.accounts) {
await this.updateAccountBalance(b, acct, delta);
b.del(layout.P.encode(acct, hash));
b.put(layout.H.encode(acct, height, hash), null);
}
await this.removeTXMap(b, hash);
await this.addBlockMap(b, height);
await this.addBlock(b, tx.hash(), block);
// Commit the new state. The balance has updated.
const balance = await this.updateBalance(b, state);
await b.write();
this.unlockTX(tx);
this.emit('confirmed', tx, details);
this.emit('balance', balance);
return details;
}
/**
* Recursively remove a transaction
* from the database.
* @param {Hash} hash
* @returns {Promise}
*/
async remove(hash) {
const wtx = await this.getTX(hash);
if (!wtx)
return null;
return this.removeRecursive(wtx);
}
/**
* Remove a transaction from the
* database. Disconnect inputs.
* @private
* @param {TXRecord} wtx
* @param {BlockMeta} block
* @returns {Promise}
*/
async erase(wtx, block) {
const b = this.bucket.batch();
const {tx, hash} = wtx;
const height = block ? block.height : -1;
const details = new Details(wtx, block);
const state = new BalanceDelta();
if (!tx.isCoinbase()) {
// We need to undo every part of the
// state this transaction ever touched.
// Start by getting the undo coins.
const credits = await this.getSpentCredits(tx);
for (let i = 0; i < tx.inputs.length; i++) {
const credit = credits[i];
if (!credit) {
if (!block)
await this.removeInput(b, tx, i);
continue;
}
const coin = credit.coin;
const path = await this.getPath(coin);
assert(path);
details.setInput(i, path, coin);
// Recalculate the balance, remove
// from stxo set, remove the undo
// coin, and resave the credit.
state.tx(path, -1);
state.coin(path, 1);
state.unconfirmed(path, coin.value);
if (block)
state.confirmed(path, coin.value);
this.unspendCredit(b, tx, i);
credit.spent = false;
await this.saveCredit(b, credit, path);
}
}
// We need to remove all credits
// this transaction created.
for (let i = 0; i < tx.outputs.length; i++) {
const output = tx.outputs[i];
const path = await this.getPath(output);
if (!path)
continue;
details.setOutput(i, path);
const credit = Credit.fromTX(tx, i, height);
state.tx(path, -1);
state.coin(path, -1);
state.unconfirmed(path, -output.value);
if (block)
state.confirmed(path, -output.value);
await this.removeCredit(b, credit, path);
}
// Remove the transaction data
// itself as well as unindex.
b.del(layout.t.encode(hash));
b.del(layout.m.encode(wtx.mtime, hash));
if (!block)
b.del(layout.p.encode(hash));
else
b.del(layout.h.encode(height, hash));
// Remove all secondary indexing.
for (const [acct, delta] of state.accounts) {
await this.updateAccountBalance(b, acct, delta);
b.del(layout.T.encode(acct, hash));
b.del(layout.M.encode(acct, wtx.mtime, hash));
if (!block)
b.del(layout.P.encode(acct, hash));
else
b.del(layout.H.encode(acct, height, hash));
}
// Update block records.
if (block) {
await this.removeBlockMap(b, height);
await this.spliceBlock(b, hash, height);
} else {
await this.removeTXMap(b, hash);
}
// Update the transaction counter
// and commit new state due to
// balance change.
const balance = await this.updateBalance(b, state);
await b.write();
this.emit('remove tx', tx, details);
this.emit('balance', balance);
return details;
}
/**
* Remove a transaction and recursively
* remove all of its spenders.
* @private
* @param {TXRecord} wtx
* @returns {Promise}
*/
async removeRecursive(wtx) {
const {tx, hash} = wtx;
if (!await this.hasTX(hash))
return null;
for (let i = 0; i < tx.outputs.length; i++) {
const spent = await this.getSpent(hash, i);
if (!spent)
continue;
// Remove all of the spender's spenders first.
const stx = await this.getTX(spent.hash);
assert(stx);
await this.removeRecursive(stx);
}
// Remove the spender.
return this.erase(wtx, wtx.getBlock());
}
/**
* Revert a block.
* @param {Number} height
* @returns {Promise}
*/
async revert(height) {
const block = await this.getBlock(height);
if (!block)
return 0;
this.logger.debug('Rescan: reverting block %d', height);
const hashes = block.toArray();
for (let i = hashes.length - 1; i >= 0; i--) {
const hash = hashes[i];
await this.unconfirm(hash);