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<h1 class="page-title">Source: coins/coinview.js</h1>
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<pre class="prettyprint source linenums"><code>/*!
* coinview.js - coin viewpoint object for bcoin
* Copyright (c) 2014-2017, Christopher Jeffrey (MIT License).
* https://github.com/bcoin-org/bcoin
*/
'use strict';
var assert = require('assert');
var co = require('../utils/co');
var Coins = require('./coins');
var UndoCoins = require('./undocoins');
var BufferReader = require('../utils/reader');
var BufferWriter = require('../utils/writer');
var CoinEntry = Coins.CoinEntry;
/**
* Represents a coin viewpoint:
* a snapshot of {@link Coins} objects.
* @alias module:coins.CoinView
* @constructor
* @property {Object} map
* @property {UndoCoins} undo
*/
function CoinView() {
if (!(this instanceof CoinView))
return new CoinView();
this.map = {};
this.undo = new UndoCoins();
}
/**
* Get coins.
* @param {Hash} hash
* @returns {Coins} coins
*/
CoinView.prototype.get = function get(hash) {
return this.map[hash];
};
/**
* Test whether the view has an entry.
* @param {Hash} hash
* @returns {Boolean}
*/
CoinView.prototype.has = function has(hash) {
return this.map[hash] != null;
};
/**
* Add coins to the collection.
* @param {Coins} coins
*/
CoinView.prototype.add = function add(coins) {
this.map[coins.hash] = coins;
return coins;
};
/**
* Remove coins from the collection.
* @param {Coins} coins
* @returns {Boolean}
*/
CoinView.prototype.remove = function remove(hash) {
if (!this.map[hash])
return false;
delete this.map[hash];
return true;
};
/**
* Add a tx to the collection.
* @param {TX} tx
* @param {Number} height
*/
CoinView.prototype.addTX = function addTX(tx, height) {
var coins = Coins.fromTX(tx, height);
return this.add(coins);
};
/**
* Remove a tx from the collection.
* @param {TX} tx
* @param {Number} height
*/
CoinView.prototype.removeTX = function removeTX(tx, height) {
var coins = Coins.fromTX(tx, height);
coins.outputs.length = 0;
return this.add(coins);
};
/**
* Add a coin to the collection.
* @param {Coin} coin
*/
CoinView.prototype.addCoin = function addCoin(coin) {
var coins = this.get(coin.hash);
if (!coins) {
coins = new Coins();
coins.hash = coin.hash;
coins.height = coin.height;
coins.coinbase = coin.coinbase;
this.add(coins);
}
if (coin.script.isUnspendable())
return;
if (!coins.has(coin.index))
coins.addCoin(coin);
};
/**
* Add an output to the collection.
* @param {Hash} hash
* @param {Number} index
* @param {Output} output
*/
CoinView.prototype.addOutput = function addOutput(hash, index, output) {
var coins = this.get(hash);
if (!coins) {
coins = new Coins();
coins.hash = hash;
coins.height = -1;
coins.coinbase = false;
this.add(coins);
}
if (output.script.isUnspendable())
return;
if (!coins.has(index))
coins.addOutput(index, output);
};
/**
* Spend an output.
* @param {Hash} hash
* @param {Number} index
* @returns {Boolean}
*/
CoinView.prototype.spendOutput = function spendOutput(hash, index) {
var coins = this.get(hash);
if (!coins)
return false;
return this.spendFrom(coins, index);
};
/**
* Remove an output.
* @param {Hash} hash
* @param {Number} index
* @returns {Boolean}
*/
CoinView.prototype.removeOutput = function removeOutput(hash, index) {
var coins = this.get(hash);
if (!coins)
return false;
return coins.remove(index);
};
/**
* Spend a coin from coins object.
* @param {Coins} coins
* @param {Number} index
* @returns {Boolean}
*/
CoinView.prototype.spendFrom = function spendFrom(coins, index) {
var entry = coins.spend(index);
var undo;
if (!entry)
return false;
this.undo.push(entry);
if (coins.isEmpty()) {
undo = this.undo.top();
undo.height = coins.height;
undo.coinbase = coins.coinbase;
undo.version = coins.version;
assert(undo.height !== -1);
}
return true;
};
/**
* Get a single coin by input.
* @param {Input} input
* @returns {Coin}
*/
CoinView.prototype.getCoin = function getCoin(input) {
var coins = this.get(input.prevout.hash);
if (!coins)
return;
return coins.getCoin(input.prevout.index);
};
/**
* Get a single output by input.
* @param {Input} input
* @returns {Output}
*/
CoinView.prototype.getOutput = function getOutput(input) {
var coins = this.get(input.prevout.hash);
if (!coins)
return;
return coins.getOutput(input.prevout.index);
};
/**
* Get a single entry by input.
* @param {Input} input
* @returns {CoinEntry}
*/
CoinView.prototype.getEntry = function getEntry(input) {
var coins = this.get(input.prevout.hash);
if (!coins)
return;
return coins.get(input.prevout.index);
};
/**
* Test whether the view has an entry by input.
* @param {Input} input
* @returns {Boolean}
*/
CoinView.prototype.hasEntry = function hasEntry(input) {
var coins = this.get(input.prevout.hash);
if (!coins)
return false;
return coins.has(input.prevout.index);
};
/**
* Get coins height by input.
* @param {Input} input
* @returns {Number}
*/
CoinView.prototype.getHeight = function getHeight(input) {
var coins = this.get(input.prevout.hash);
if (!coins)
return -1;
return coins.height;
};
/**
* Get coins coinbase flag by input.
* @param {Input} input
* @returns {Boolean}
*/
CoinView.prototype.isCoinbase = function isCoinbase(input) {
var coins = this.get(input.prevout.hash);
if (!coins)
return false;
return coins.coinbase;
};
/**
* Retrieve coins from database.
* @method
* @param {ChainDB} db
* @param {TX} tx
* @returns {Promise} - Returns {@link Coins}.
*/
CoinView.prototype.readCoins = co(function* readCoins(db, hash) {
var coins = this.map[hash];
if (!coins) {
coins = yield db.getCoins(hash);
if (!coins)
return;
this.map[hash] = coins;
}
return coins;
});
/**
* Read all input coins into unspent map.
* @method
* @param {ChainDB} db
* @param {TX} tx
* @returns {Promise} - Returns {Boolean}.
*/
CoinView.prototype.ensureInputs = co(function* ensureInputs(db, tx) {
var found = true;
var i, input;
for (i = 0; i &lt; tx.inputs.length; i++) {
input = tx.inputs[i];
if (!(yield this.readCoins(db, input.prevout.hash)))
found = false;
}
return found;
});
/**
* Spend coins for transaction.
* @method
* @param {ChainDB} db
* @param {TX} tx
* @returns {Promise} - Returns {Boolean}.
*/
CoinView.prototype.spendInputs = co(function* spendInputs(db, tx) {
var i, input, prevout, coins;
for (i = 0; i &lt; tx.inputs.length; i++) {
input = tx.inputs[i];
prevout = input.prevout;
coins = yield this.readCoins(db, prevout.hash);
if (!coins)
return false;
if (!this.spendFrom(coins, prevout.index))
return false;
}
return true;
});
/**
* Convert collection to an array.
* @returns {Coins[]}
*/
CoinView.prototype.toArray = function toArray() {
var keys = Object.keys(this.map);
var out = [];
var i, hash;
for (i = 0; i &lt; keys.length; i++) {
hash = keys[i];
out.push(this.map[hash]);
}
return out;
};
/**
* Calculate serialization size.
* @returns {Number}
*/
CoinView.prototype.getFastSize = function getFastSize(tx) {
var size = 0;
var i, input, entry;
size += tx.inputs.length;
for (i = 0; i &lt; tx.inputs.length; i++) {
input = tx.inputs[i];
entry = this.getEntry(input);
if (!entry)
continue;
size += entry.getSize();
}
return size;
};
/**
* Write coin data to buffer writer
* as it pertains to a transaction.
* @param {BufferWriter} bw
* @param {TX} tx
*/
CoinView.prototype.toFast = function toFast(bw, tx) {
var i, input, prevout, coins, entry;
for (i = 0; i &lt; tx.inputs.length; i++) {
input = tx.inputs[i];
prevout = input.prevout;
coins = this.get(prevout.hash);
if (!coins) {
bw.writeU8(0);
continue;
}
entry = coins.get(prevout.index);
if (!entry) {
bw.writeU8(0);
continue;
}
bw.writeU8(1);
entry.toWriter(bw);
}
return bw;
};
/**
* Read serialized view data from a buffer
* reader as it pertains to a transaction.
* @private
* @param {BufferReader} br
* @param {TX} tx
*/
CoinView.prototype.fromFast = function fromFast(br, tx) {
var i, input, prevout, coins, entry;
for (i = 0; i &lt; tx.inputs.length; i++) {
input = tx.inputs[i];
prevout = input.prevout;
if (br.readU8() === 0)
continue;
coins = this.get(prevout.hash);
if (!coins) {
coins = new Coins();
coins.hash = prevout.hash;
coins.coinbase = false;
this.add(coins);
}
entry = CoinEntry.fromReader(br);
coins.add(prevout.index, entry);
}
return this;
};
/**
* Read serialized view data from a buffer
* reader as it pertains to a transaction.
* @param {BufferReader} br
* @param {TX} tx
* @returns {CoinView}
*/
CoinView.fromFast = function fromFast(br, tx) {
return new CoinView().fromFast(br, tx);
};
/**
* Write coin data to buffer writer
* as it pertains to a transaction.
* @param {BufferWriter} bw
* @param {TX} tx
*/
CoinView.prototype.toWriter = function toWriter(bw, tx) {
var map = {};
var i, input, prevout, coins, entry, height;
for (i = 0; i &lt; tx.inputs.length; i++) {
input = tx.inputs[i];
prevout = input.prevout;
coins = this.get(prevout.hash);
if (!coins) {
bw.writeU8(0);
continue;
}
entry = coins.get(prevout.index);
if (!entry) {
bw.writeU8(0);
continue;
}
bw.writeU8(1);
if (!map[prevout.hash]) {
height = coins.height;
if (height === -1)
height = 0;
bw.writeVarint(height * 2 + (coins.coinbase ? 1 : 0));
bw.writeVarint(coins.version);
map[prevout.hash] = true;
}
entry.toWriter(bw);
}
return bw;
};
/**
* Serialize coin data to as it
* pertains to a transaction.
* @param {TX} tx
* @returns {Buffer}
*/
CoinView.prototype.toRaw = function toRaw(tx) {
return this.toWriter(new BufferWriter()).render();
};
/**
* Read serialized view data from a buffer
* reader as it pertains to a transaction.
* @private
* @param {BufferReader} br
* @param {TX} tx
*/
CoinView.prototype.fromReader = function fromReader(br, tx) {
var i, input, prevout, coins, entry, height;
for (i = 0; i &lt; tx.inputs.length; i++) {
input = tx.inputs[i];
prevout = input.prevout;
if (br.readU8() === 0)
continue;
coins = this.get(prevout.hash);
if (!coins) {
coins = new Coins();
coins.hash = prevout.hash;
height = br.readVarint();
coins.coinbase = (height &amp; 1) !== 0;
height = height / 2 | 0;
if (height === 0)
height = -1;
coins.height = height;
coins.version = br.readVarint();
this.add(coins);
}
entry = CoinEntry.fromReader(br);
coins.add(prevout.index, entry);
}
return this;
};
/**
* Read serialized view data from a buffer
* reader as it pertains to a transaction.
* @param {BufferReader} br
* @param {TX} tx
* @returns {CoinView}
*/
CoinView.fromReader = function fromReader(br, tx) {
return new CoinView().fromReader(br, tx);
};
/**
* Read serialized view data from a buffer
* as it pertains to a transaction.
* @param {Buffer} data
* @param {TX} tx
* @returns {CoinView}
*/
CoinView.fromRaw = function fromRaw(data, tx) {
return new CoinView().fromReader(new BufferReader(data), tx);
};
/*
* Expose
*/
module.exports = CoinView;
</code></pre>
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href="module-net_packets-FeeFilterPacket.html">FeeFilterPacket</a></li><li><a href="module-net_packets-FilterAddPacket.html">FilterAddPacket</a></li><li><a href="module-net_packets-FilterClearPacket.html">FilterClearPacket</a></li><li><a href="module-net_packets-FilterLoadPacket.html">FilterLoadPacket</a></li><li><a href="module-net_packets-GetAddrPacket.html">GetAddrPacket</a></li><li><a href="module-net_packets-GetBlocksPacket.html">GetBlocksPacket</a></li><li><a href="module-net_packets-GetBlockTxnPacket.html">GetBlockTxnPacket</a></li><li><a href="module-net_packets-GetDataPacket.html">GetDataPacket</a></li><li><a href="module-net_packets-GetHeadersPacket.html">GetHeadersPacket</a></li><li><a href="module-net_packets-HeadersPacket.html">HeadersPacket</a></li><li><a href="module-net_packets-InvPacket.html">InvPacket</a></li><li><a href="module-net_packets-MempoolPacket.html">MempoolPacket</a></li><li><a href="module-net_packets-MerkleBlockPacket.html">MerkleBlockPacket</a></li><li><a href="module-net_packets-NotFoundPacket.html">NotFoundPacket</a></li><li><a href="module-net_packets-Packet.html">Packet</a></li><li><a href="module-net_packets-PingPacket.html">PingPacket</a></li><li><a href="module-net_packets-PongPacket.html">PongPacket</a></li><li><a href="module-net_packets-RejectPacket.html">RejectPacket</a></li><li><a href="module-net_packets-SendCmpctPacket.html">SendCmpctPacket</a></li><li><a href="module-net_packets-SendHeadersPacket.html">SendHeadersPacket</a></li><li><a href="module-net_packets-TXPacket.html">TXPacket</a></li><li><a href="module-net_packets-UnknownPacket.html">UnknownPacket</a></li><li><a href="module-net_packets-VerackPacket.html">VerackPacket</a></li><li><a href="module-net_packets-VersionPacket.html">VersionPacket</a></li><li><a href="module-net_socks-Proxy.html">Proxy</a></li><li><a href="module-net_socks-SOCKS.html">SOCKS</a></li><li><a href="module-node.FullNode.html">FullNode</a></li><li><a href="module-node.Logger.html">Logger</a></li><li><a href="module-node.Node.html">Node</a></li><li><a href="module-node.NodeClient.html">NodeClient</a></li><li><a href="module-node.SPVNode.html">SPVNode</a></li><li><a href="module-primitives.AbstractBlock.html">AbstractBlock</a></li><li><a href="module-primitives.Address.html">Address</a></li><li><a href="module-primitives.Block.html">Block</a></li><li><a href="module-primitives.Coin.html">Coin</a></li><li><a href="module-primitives.CoinSelector.html">CoinSelector</a></li><li><a href="module-primitives.Headers.html">Headers</a></li><li><a href="module-primitives.Input.html">Input</a></li><li><a href="module-primitives.InvItem.html">InvItem</a></li><li><a href="module-primitives.KeyRing.html">KeyRing</a></li><li><a href="module-primitives.MemBlock.html">MemBlock</a></li><li><a href="module-primitives.MerkleBlock.html">MerkleBlock</a></li><li><a href="module-primitives.MTX.html">MTX</a></li><li><a href="module-primitives.NetAddress.html">NetAddress</a></li><li><a href="module-primitives.Outpoint.html">Outpoint</a></li><li><a href="module-primitives.Output.html">Output</a></li><li><a href="module-primitives.TX.html">TX</a></li><li><a href="module-primitives.TXMeta.html">TXMeta</a></li><li><a href="module-protocol.Network.html">Network</a></li><li><a href="module-protocol.TimeData.html">TimeData</a></li><li><a href="module-protocol_errors-VerifyError.html">VerifyError</a></li><li><a href="module-protocol_errors-VerifyResult.html">VerifyResult</a></li><li><a href="module-script.Opcode.html">Opcode</a></li><li><a href="module-script.Program.html">Program</a></li><li><a href="module-script.Script.html">Script</a></li><li><a href="module-script.ScriptError.html">ScriptError</a></li><li><a href="module-script.SigCache.html">SigCache</a></li><li><a href="module-script.Stack.html">Stack</a></li><li><a href="module-script.Witness.html">Witness</a></li><li><a href="module-utils.AsyncEmitter.html">AsyncEmitter</a></li><li><a href="module-utils.AsyncObject.html">AsyncObject</a></li><li><a href="module-utils.Bloom.html">Bloom</a></li><li><a href="module-utils.BufferReader.html">BufferReader</a></li><li><a href="module-utils.BufferWriter.html">BufferWriter</a></li><li><a href="module-utils.List.html">List</a></li><li><a href="module-utils.ListItem.html">ListItem</a></li><li><a href="module-utils.Lock.html">Lock</a></li><li><a href="module-utils.LRU.html">LRU</a></li><li><a href="module-utils.LRUBatch.html">LRUBatch</a></li><li><a href="module-utils.LRUItem.html">LRUItem</a></li><li><a href="module-utils.LRUOp.html">LRUOp</a></li><li><a href="module-utils.Map.html">Map</a></li><li><a href="module-utils.MappedLock.html">MappedLock</a></li><li><a href="module-utils.RollingFilter.html">RollingFilter</a></li><li><a href="module-utils.StaticWriter.html">StaticWriter</a></li><li><a href="module-utils_ip.Address.html">Address</a></li><li><a href="module-utils_protobuf-ProtoReader.html">ProtoReader</a></li><li><a href="module-utils_protobuf-ProtoWriter.html">ProtoWriter</a></li><li><a href="module-wallet.Account.html">Account</a></li><li><a href="module-wallet.Balance.html">Balance</a></li><li><a href="module-wallet.BlockRecord.html">BlockRecord</a></li><li><a href="module-wallet.ChainState.html">ChainState</a></li><li><a href="module-wallet.Credit.html">Credit</a></li><li><a href="module-wallet.Details.html">Details</a></li><li><a href="module-wallet.DetailsMember.html">DetailsMember</a></li><li><a href="module-wallet.MasterKey.html">MasterKey</a></li><li><a href="module-wallet.Path.html">Path</a></li><li><a href="module-wallet.TXDB.html">TXDB</a></li><li><a href="module-wallet.Wallet.html">Wallet</a></li><li><a href="module-wallet.WalletClient.html">WalletClient</a></li><li><a href="module-wallet.WalletDB.html">WalletDB</a></li><li><a href="module-wallet.WalletKey.html">WalletKey</a></li><li><a href="module-wallet.WalletOptions.html">WalletOptions</a></li><li><a href="module-wallet_records-BlockMapRecord.html">BlockMapRecord</a></li><li><a href="module-wallet_records-BlockMeta.html">BlockMeta</a></li><li><a href="module-wallet_records-ChainState.html">ChainState</a></li><li><a href="module-wallet_records-OutpointMapRecord.html">OutpointMapRecord</a></li><li><a href="module-wallet_records-PathMapRecord.html">PathMapRecord</a></li><li><a href="module-wallet_records-TXMapRecord.html">TXMapRecord</a></li><li><a href="module-wallet_records-TXRecord.html">TXRecord</a></li><li><a href="module-workers.Framer.html">Framer</a></li><li><a href="module-workers.Master.html">Master</a></li><li><a href="module-workers.Parser.html">Parser</a></li><li><a href="module-workers.ParserClient.html">ParserClient</a></li><li><a href="module-workers.Worker.html">Worker</a></li><li><a href="module-workers.WorkerPool.html">WorkerPool</a></li><li><a href="module-workers_packets-ECSignPacket.html">ECSignPacket</a></li><li><a href="module-workers_packets-ECSignResultPacket.html">ECSignResultPacket</a></li><li><a href="module-workers_packets-ECVerifyPacket.html">ECVerifyPacket</a></li><li><a href="module-workers_packets-ECVerifyResultPacket.html">ECVerifyResultPacket</a></li><li><a href="module-workers_packets-ErrorPacket.html">ErrorPacket</a></li><li><a href="module-workers_packets-ErrorResultPacket.html">ErrorResultPacket</a></li><li><a href="module-workers_packets-EventPacket.html">EventPacket</a></li><li><a href="module-workers_packets-LogPacket.html">LogPacket</a></li><li><a href="module-workers_packets-MinePacket.html">MinePacket</a></li><li><a href="module-workers_packets-MineResultPacket.html">MineResultPacket</a></li><li><a href="module-workers_packets-Packet.html">Packet</a></li><li><a href="module-workers_packets-ScryptPacket.html">ScryptPacket</a></li><li><a href="module-workers_packets-ScryptResultPacket.html">ScryptResultPacket</a></li><li><a href="module-workers_packets-SignInputPacket.html">SignInputPacket</a></li><li><a href="module-workers_packets-SignInputResultPacket.html">SignInputResultPacket</a></li><li><a href="module-workers_packets-SignPacket.html">SignPacket</a></li><li><a href="module-workers_packets-SignResultPacket.html">SignResultPacket</a></li><li><a href="module-workers_packets-VerifyInputPacket.html">VerifyInputPacket</a></li><li><a href="module-workers_packets-VerifyInputResultPacket.html">VerifyInputResultPacket</a></li><li><a href="module-workers_packets-VerifyPacket.html">VerifyPacket</a></li><li><a href="module-workers_packets-VerifyResultPacket.html">VerifyResultPacket</a></li></ul><h3>Namespaces</h3><ul><li><a href="module-crypto_pk.ecdsa.html">ecdsa</a></li><li><a href="module-crypto_pk.rsa.html">rsa</a></li></ul><h3>Global</h3><ul><li><a href="global.html"></a></li><li><a href="global.html#DoubleMap">DoubleMap</a></li><li><a href="global.html#StatEntry">StatEntry</a></li></ul>
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