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<h1 class="page-title">Source: protocol/policy.js</h1>
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<pre class="prettyprint source linenums"><code>/*!
* policy.js - bitcoin constants for bcoin
* Copyright (c) 2014-2015, Fedor Indutny (MIT License)
* Copyright (c) 2014-2017, Christopher Jeffrey (MIT License).
* https://github.com/bcoin-org/bcoin
*/
'use strict';
/**
* @module protocol/policy
*/
var consensus = require('./consensus');
/**
* Maximum transaction version (policy).
* @const {Number}
* @default
*/
exports.MAX_TX_VERSION = 2;
/**
* Maximum transaction base size (policy).
* @const {Number}
* @default
*/
exports.MAX_TX_SIZE = consensus.MAX_BLOCK_SIZE / 10;
/**
* Maximum transaction weight (policy).
* @const {Number}
* @default
*/
exports.MAX_TX_WEIGHT = consensus.MAX_BLOCK_WEIGHT / 10;
/**
* Maximum number of transaction sigops (policy).
* @const {Number}
* @default
*/
exports.MAX_TX_SIGOPS = consensus.MAX_BLOCK_SIGOPS / 5;
/**
* Maximum cost of transaction sigops (policy).
* @const {Number}
* @default
*/
exports.MAX_TX_SIGOPS_COST = consensus.MAX_BLOCK_SIGOPS_COST / 5;
/**
* How much weight a sigop should
* add to virtual size (policy).
* @const {Number}
* @default
*/
exports.BYTES_PER_SIGOP = 20;
/**
* Minimum relay fee rate (policy).
* @const {Rate}
*/
exports.MIN_RELAY = 1000;
/**
* Whether bare multisig outputs
* should be relayed (policy).
* @const {Boolean}
* @default
*/
exports.BARE_MULTISIG = true;
/**
* Priority threshold for
* free transactions (policy).
* @const {Number}
* @default
*/
exports.FREE_THRESHOLD = consensus.COIN * 144 / 250;
/**
* Max sigops per redeem script (policy).
* @const {Number}
* @default
*/
exports.MAX_P2SH_SIGOPS = 15;
/**
* Max serialized nulldata size (policy).
* @const {Number}
* @default
*/
exports.MAX_OP_RETURN_BYTES = 83;
/**
* Max pushdata size in nulldata (policy).
* @const {Number}
* @default
*/
exports.MAX_OP_RETURN = 80;
/**
* Max p2wsh stack size. Used for
* witness malleation checks (policy).
* @const {Number}
* @default
*/
exports.MAX_P2WSH_STACK = 100;
/**
* Max p2wsh push size. Used for
* witness malleation checks (policy).
* @const {Number}
* @default
*/
exports.MAX_P2WSH_PUSH = 80;
/**
* Max serialized p2wsh size. Used for
* witness malleation checks (policy).
* @const {Number}
* @default
*/
exports.MAX_P2WSH_SIZE = 3600;
/**
* Default ancestor limit.
* @const {Number}
* @default
*/
exports.MEMPOOL_MAX_ANCESTORS = 25;
/**
* Default maximum mempool size in bytes.
* @const {Number}
* @default
*/
exports.MEMPOOL_MAX_SIZE = 100 * 1000000;
/**
* Time at which transactions
* fall out of the mempool.
* @const {Number}
* @default
*/
exports.MEMPOOL_EXPIRY_TIME = 72 * 60 * 60;
/**
* Maximum number of orphan transactions.
* @const {Number}
* @default
*/
exports.MEMPOOL_MAX_ORPHANS = 100;
/**
* Block weight to be reached before
* rejecting priority transactions during
* mining.
* @const {Number}
* @default
*/
exports.MIN_BLOCK_WEIGHT = 0;
/**
* Maximum block weight to be mined.
* @const {Number}
* @default
*/
exports.MAX_BLOCK_WEIGHT = 750000 * consensus.WITNESS_SCALE_FACTOR;
/**
* Bottom priority threshold to be seen
* before ignoring priority transactions
* during mining.
* @const {Number}
* @default
*/
exports.MIN_BLOCK_PRIORITY = 50000 * consensus.WITNESS_SCALE_FACTOR;
/**
* Weight to be reached before ignoring
* priority transactions during mining.
* @const {Number}
* @default
*/
exports.PRIORITY_BLOCK_WEIGHT = exports.FREE_THRESHOLD;
/**
* Calculate minimum fee based on rate and size.
* @param {Number?} size
* @param {Rate?} rate - Rate of satoshi per kB.
* @returns {Amount} fee
*/
exports.getMinFee = function getMinFee(size, rate) {
var fee;
if (rate == null)
rate = exports.MIN_RELAY;
fee = Math.floor(rate * size / 1000);
if (fee === 0 &amp;&amp; rate > 0)
fee = rate;
return fee;
};
/**
* Calculate the minimum fee in order for the transaction
* to be relayable, but _round to the nearest kilobyte
* when taking into account size.
* @param {Number?} size
* @param {Rate?} rate - Rate of satoshi per kB.
* @returns {Amount} fee
*/
exports.getRoundFee = function getRoundFee(size, rate) {
var fee;
if (rate == null)
rate = exports.MIN_RELAY;
fee = rate * Math.ceil(size / 1000);
if (fee === 0 &amp;&amp; rate > 0)
fee = rate;
return fee;
};
/**
* Calculate a fee rate based on size and fees.
* @param {Number} size
* @param {Amount} fee
* @returns {Rate}
*/
exports.getRate = function getRate(size, fee) {
return Math.floor(fee * 1000 / size);
};
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