72 lines
2.7 KiB
JavaScript
72 lines
2.7 KiB
JavaScript
/*global web3*/
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const async = require('async');
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const ContractFuzzer = require('./fuzzer.js');
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class GasEstimator {
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constructor(embark) {
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this.embark = embark;
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this.logger = embark.logger;
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this.events = embark.events;
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this.fuzzer = new ContractFuzzer(embark);
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}
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estimateGas(contractName, cb) {
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const self = this;
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let gasMap = {};
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self.events.request('contracts:contract', contractName, (contract) => {
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let fuzzMap = self.fuzzer.generateFuzz(3, contract);
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let contractObj = new web3.eth.Contract(contract.abiDefinition, contract.deployedAddress);
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async.each(contract.abiDefinition.filter((x) => x.type !== "event"),
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(abiMethod, gasCb) => {
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let name = abiMethod.name;
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if (abiMethod.type === "constructor") {
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// already provided for us
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gasMap['constructor'] = contract.gasEstimates.creation.totalCost.toString();
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return gasCb(null, name, abiMethod.type);
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} else if (abiMethod.type == "fallback") {
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gasMap['fallback'] = contract.gasEstimates.external[""].toString();
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return gasCb(null, name, abiMethod.type);
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} else if (
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(abiMethod.inputs === null || abiMethod.inputs === undefined || abiMethod.inputs.length === 0)
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) {
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// just run it and register it
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contractObj.methods[name]
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.apply(contractObj.methods[name], [])
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.estimateGas((err, gasAmount) => {
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if (err) return gasCb(err, name, abiMethod.type);
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gasMap[name] = gasAmount;
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return gasCb(null, name, abiMethod.type);
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});
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} else {
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// async concatenate all the fuzz values and their gas cost outputs and check for equality
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async.concat(fuzzMap[name], (values, getVarianceCb) => {
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contractObj.methods[name].apply(contractObj.methods[name], values)
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.estimateGas((err, gasAmount) => {
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getVarianceCb(err, gasAmount);
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});
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}, (err, variance) => {
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if (variance.every(v => v === variance[0])) {
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gasMap[name] = variance[0];
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} else {
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// get average
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let sum = variance.reduce(function(memo, num) { return memo + num; });
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gasMap[name] = sum / variance.length;
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}
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return gasCb(null, name, abiMethod.type);
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});
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}
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},
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(err, name, type) => {
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if (err) {
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if (type === "constructor" || type === "fallback") name = type;
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return cb(err, null, name);
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}
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cb(null, gasMap, null);
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}
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);
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});
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}
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}
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module.exports = GasEstimator;
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