mirror of https://github.com/embarklabs/embark.git
70 lines
2.6 KiB
JavaScript
70 lines
2.6 KiB
JavaScript
/*global web3*/
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const async = require('async');
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const _ = require('underscore');
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const ContractFuzzer = require('../fuzzer');
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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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self.logger.info("Generating three rounds of fuzz for contract -- ", contractName);
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let fuzzMap = self.fuzzer.generateFuzz(3, contract);
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self.logger.info("-- Beginning gastimation for contract -- " + contractName);
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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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gasCb();
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} else if (abiMethod.type === "fallback") {
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gasMap['fallback'] = contract.gasEstimates.external[""].toString();
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gasCb();
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} else if (abiMethod.inputs === null || abiMethod.inputs === undefined || abiMethod.inputs.length === 0) {
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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);
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gasMap[name] = gasAmount;
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gasCb();
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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 (err) {
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return gasCb(err);
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} else if (_.isEqual(variance[0], variance[1]) && _.isEqual(variance[1], variance[2])) {
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gasMap[name] = variance[0];
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} else {
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gasMap[name] = 'infinite';
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}
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gasCb();
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});
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}
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},
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(err) => {
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if (err) return cb(err);
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cb(null, gasMap);
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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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