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<h1><a href="../../../index.html">All files</a> / <a href="index.html">src/tx/applyTx</a> utils.js</h1>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/**
* Copyright (c) 2018-present, Leap DAO (leapdao.org)
*
* This source code is licensed under the Mozilla Public License Version 2.0
* found in the LICENSE file in the root directory of this source tree.
*/
const { Outpoint, Type } = require('leap-core');
const { isNFT, isNST } = require('../../utils');
const { uniq, isEqual } = require('lodash');
const groupValuesByColor = (values, { color, value }) => {
<span class="missing-if-branch" title="if path not taken" >I</span>if (!isNFT(color) && !isNST(color) && BigInt(value) < 1n) {
<span class="cstat-no" title="statement not covered" > throw new Error('One of the outs has value < 1');</span>
}
return Object.assign({}, values, {
[color]:
isNFT(color) || isNST(color)
? (values[color] || new Set()).add(BigInt(value))
: (values[color] || 0n) + BigInt(value),
});
};
const checkInsAndOuts = (tx, state, bridgeState, unspentFilter) => {
const inputTransactions = tx.inputs
.map(input => state.unspent[input.prevout.hex()])
.filter(unspentFilter);
if (tx.inputs.length !== inputTransactions.length) {
throw new Error('Wrong inputs');
}
const insValues = inputTransactions.reduce(groupValuesByColor, {});
const outsValues = tx.outputs.reduce(groupValuesByColor, {});
const colors = uniq([
...Object.keys(insValues),
...Object.keys(outsValues),
]).map(Number);
const minGasPrice = BigInt(state.gas.minPrice);
const gas = Math.max(0, tx.outputs.length * 20000 - tx.inputs.length * 10000);
for (const color of colors) {
const inputValue = insValues[color] || 0n;
const outputValue = outsValues[color] || 0n;
if (
color === 0 &&
gas > 0 &&
minGasPrice > 0n &&
tx.type === Type.TRANSFER
) {
const txGasPrice = (inputValue - outputValue) / BigInt(gas);
<span class="missing-if-branch" title="else path not taken" >E</span>if (txGasPrice < minGasPrice) {
throw new Error(`Tx underpriced`);
}
}
const isNFTByColor = isNFT(color) || isNST(color);
if (
(isNFTByColor && !isEqual(inputValue, outputValue)) ||
(!isNFTByColor && outputValue > inputValue)
) {
throw new Error(`Ins and outs values are mismatch for color ${color}`);
}
}
};
const checkOutpoints = (state, tx) => {
if (tx.type === Type.PERIOD_VOTE) return;
tx.inputs.forEach(input => {
const outpointId = input.prevout.hex();
if (!state.unspent[outpointId]) {
throw new Error('Trying to spend non-existing output');
}
});
};
const addOutputs = ({ balances, owners, unspent }, tx) => {
if (tx.type === Type.PERIOD_VOTE) return;
tx.outputs.forEach((out, outPos) => {
const outpoint = new Outpoint(tx.hash(), outPos);
if (unspent[outpoint.hex()] !== undefined) {
throw new Error('Attempt to create existing output');
}
const cBalances = balances[out.color] || {};
const cOwners = owners[out.color] || {};
const tokenIsNFT = isNFT(out.color);
const tokenIsNST = isNST(out.color);
balances[out.color] = cBalances;
owners[out.color] = cOwners;
if (tokenIsNFT || tokenIsNST) {
cBalances[out.address] = cBalances[out.address] || [];
cBalances[out.address].push(out.value);
cOwners[out.value] = out.address;
} else {
cBalances[out.address] = BigInt(cBalances[out.address] || 0);
cBalances[out.address] = (cBalances[out.address] + out.value).toString();
}
unspent[outpoint.hex()] = out.toJSON();
});
};
const removeInputs = ({ unspent, balances, owners }, tx) => {
if (tx.type === Type.PERIOD_VOTE) return;
tx.inputs.forEach(input => {
const outpointId = input.prevout.hex();
const { address, value, color } = unspent[outpointId];
if (isNFT(color) || isNST(color)) {
const index = balances[color][address].indexOf(value);
balances[color][address].splice(index, 1);
delete owners[color][BigInt(value).toString()];
} else {
balances[color][address] = (
BigInt(balances[color][address]) - BigInt(value)
).toString();
}
delete unspent[outpointId];
});
};
exports.checkInsAndOuts = checkInsAndOuts;
exports.checkOutpoints = checkOutpoints;
exports.groupValuesByColor = groupValuesByColor;
exports.addOutputs = addOutputs;
exports.removeInputs = removeInputs;
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