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import * as _ from 'lodash';
import {
AbstractArtifactAdapter,
collectCoverageEntries,
ContractData,
Coverage,
SingleFileSubtraceHandler,
SourceRange,
Subtrace,
TraceCollector,
TraceInfo,
TraceInfoSubprovider,
utils,
} from '@0x/sol-tracing-utils';
/**
* This class implements the [web3-provider-engine](https://github.com/MetaMask/provider-engine) subprovider interface.
* ProfilerSubprovider is used to profile Solidity code while running tests.
*/
export class ProfilerSubprovider extends TraceInfoSubprovider {
private readonly _profilerCollector: TraceCollector;
/**
* Instantiates a ProfilerSubprovider instance
* @param artifactAdapter Adapter for used artifacts format (0x, truffle, giveth, etc.)
* @param defaultFromAddress default from address to use when sending transactions
* @param isVerbose If true, we will log any unknown transactions. Otherwise we will ignore them
*/
constructor(artifactAdapter: AbstractArtifactAdapter, defaultFromAddress: string, isVerbose: boolean = true) {
const traceCollectionSubproviderConfig = {
shouldCollectTransactionTraces: true,
shouldCollectGasEstimateTraces: false,
shouldCollectCallTraces: false,
};
super(defaultFromAddress, traceCollectionSubproviderConfig);
this._profilerCollector = new TraceCollector(artifactAdapter, isVerbose, profilerHandler);
}
protected async _handleTraceInfoAsync(traceInfo: TraceInfo): Promise<void> {
await this._profilerCollector.computeSingleTraceCoverageAsync(traceInfo);
}
/**
* Write the test profiler results to a file in Istanbul format.
*/
public async writeProfilerOutputAsync(): Promise<void> {
await this._profilerCollector.writeOutputAsync();
}
}
/**
* Computed partial coverage for a single file & subtrace for the purposes of
* gas profiling.
* @param contractData Contract metadata (source, srcMap, bytecode)
* @param subtrace A subset of a transcation/call trace that was executed within that contract
* @param pcToSourceRange A mapping from program counters to source ranges
* @param fileIndex Index of a file to compute coverage for
* @return Partial istanbul coverage for that file & subtrace
*/
export const profilerHandler: SingleFileSubtraceHandler = (
contractData: ContractData,
subtrace: Subtrace,
pcToSourceRange: { [programCounter: number]: SourceRange },
fileIndex: number,
): Coverage => {
const absoluteFileName = contractData.sources[fileIndex];
const profilerEntriesDescription = collectCoverageEntries(contractData.sourceCodes[fileIndex]);
const gasConsumedByStatement: { [statementId: string]: number } = {};
const statementIds = _.keys(profilerEntriesDescription.statementMap);
for (const statementId of statementIds) {
const statementDescription = profilerEntriesDescription.statementMap[statementId];
const totalGasCost = _.sum(
_.map(subtrace, structLog => {
const sourceRange = pcToSourceRange[structLog.pc];
if (_.isUndefined(sourceRange)) {
return 0;
}
if (sourceRange.fileName !== absoluteFileName) {
return 0;
}
if (utils.isRangeInside(sourceRange.location, statementDescription)) {
return structLog.gasCost;
} else {
return 0;
}
}),
);
gasConsumedByStatement[statementId] = totalGasCost;
}
const partialProfilerOutput = {
[absoluteFileName]: {
...profilerEntriesDescription,
path: absoluteFileName,
f: {}, // I's meaningless in profiling context
s: gasConsumedByStatement,
b: {}, // I's meaningless in profiling context
},
};
return partialProfilerOutput;
};
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