import { ContractAbi } from '@0xproject/types'; import { logUtils, promisify } from '@0xproject/utils'; import chalk from 'chalk'; import * as ethUtil from 'ethereumjs-util'; import * as fs from 'fs'; import 'isomorphic-fetch'; import * as _ from 'lodash'; import * as path from 'path'; import * as requireFromString from 'require-from-string'; import * as semver from 'semver'; import solc = require('solc'); import { binPaths } from './solc/bin_paths'; import { createDirIfDoesNotExistAsync, findImportIfExist, getContractArtifactIfExistsAsync, getNormalizedErrMsg, parseDependencies, parseSolidityVersionRange, } from './utils/compiler'; import { constants } from './utils/constants'; import { fsWrapper } from './utils/fs_wrapper'; import { CompilerOptions, ContractArtifact, ContractNetworkData, ContractNetworks, ContractSourceData, ContractSources, ContractSpecificSourceData, } from './utils/types'; import { utils } from './utils/utils'; const ALL_CONTRACTS_IDENTIFIER = '*'; const SOLC_BIN_DIR = path.join(__dirname, '..', '..', 'solc_bin'); /** * The Compiler facilitates compiling Solidity smart contracts and saves the results * to artifact files. */ export class Compiler { private _contractsDir: string; private _networkId: number; private _optimizerEnabled: boolean; private _artifactsDir: string; // This get's set in the beggining of `compileAsync` function. It's not called from a constructor, but it's the only public method of that class and could as well be. private _contractSources!: ContractSources; private _specifiedContracts: Set = new Set(); private _contractSourceData: ContractSourceData = {}; /** * Recursively retrieves Solidity source code from directory. * @param dirPath Directory to search. * @return Mapping of contract fileName to contract source. */ private static async _getContractSourcesAsync(dirPath: string): Promise { let dirContents: string[] = []; try { dirContents = await fsWrapper.readdirAsync(dirPath); } catch (err) { throw new Error(`No directory found at ${dirPath}`); } let sources: ContractSources = {}; for (const fileName of dirContents) { const contentPath = `${dirPath}/${fileName}`; const contractName = path.basename(fileName, constants.SOLIDITY_FILE_EXTENSION); const absoluteFilePath = path.resolve(contentPath); if (path.extname(fileName) === constants.SOLIDITY_FILE_EXTENSION) { try { const opts = { encoding: 'utf8', }; const source = await fsWrapper.readFileAsync(contentPath, opts); sources[contractName] = { source, absoluteFilePath, }; logUtils.log(`Reading ${contractName} source...`); } catch (err) { logUtils.log(`Could not find file at ${contentPath}`); } } else { try { const nestedSources = await Compiler._getContractSourcesAsync(contentPath); sources = { ...sources, ...nestedSources, }; } catch (err) { logUtils.log(`${contentPath} is not a directory or ${constants.SOLIDITY_FILE_EXTENSION} file`); } } } return sources; } /** * Instantiates a new instance of the Compiler class. * @param opts Options specifying directories, network, and optimization settings. * @return An instance of the Compiler class. */ constructor(opts: CompilerOptions) { this._contractsDir = opts.contractsDir; this._networkId = opts.networkId; this._optimizerEnabled = opts.optimizerEnabled; this._artifactsDir = opts.artifactsDir; this._specifiedContracts = opts.specifiedContracts; } /** * Compiles selected Solidity files found in `contractsDir` and writes JSON artifacts to `artifactsDir`. */ public async compileAsync(): Promise { await createDirIfDoesNotExistAsync(this._artifactsDir); await createDirIfDoesNotExistAsync(SOLC_BIN_DIR); this._contractSources = await Compiler._getContractSourcesAsync(this._contractsDir); const contractNames = _.keys(this._contractSources); for (const contractName of contractNames) { const contractSource = this._contractSources[contractName]; this._setContractSpecificSourceData(contractSource.source, contractName); } const contractNamesToCompile = this._specifiedContracts.has(ALL_CONTRACTS_IDENTIFIER) ? _.keys(this._contractSources) : Array.from(this._specifiedContracts.values()); for (const contractNameToCompile of contractNamesToCompile) { await this._compileContractAsync(contractNameToCompile); } } /** * Compiles contract and saves artifact to artifactsDir. * @param fileName Name of contract with '.sol' extension. */ private async _compileContractAsync(contractName: string): Promise { if (_.isUndefined(this._contractSources)) { throw new Error('Contract sources not yet initialized'); } const contractSpecificSourceData = this._contractSourceData[contractName]; const currentArtifactIfExists = await getContractArtifactIfExistsAsync(this._artifactsDir, contractName); const sourceHash = `0x${contractSpecificSourceData.sourceHash.toString('hex')}`; const sourceTreeHash = `0x${contractSpecificSourceData.sourceTreeHash.toString('hex')}`; let shouldCompile = false; if (_.isUndefined(currentArtifactIfExists)) { shouldCompile = true; } else { const currentArtifact = currentArtifactIfExists as ContractArtifact; shouldCompile = currentArtifact.networks[this._networkId].optimizer_enabled !== this._optimizerEnabled || currentArtifact.networks[this._networkId].source_tree_hash !== sourceTreeHash; } if (!shouldCompile) { return; } const availableCompilerVersions = _.keys(binPaths); const solcVersion = semver.maxSatisfying( availableCompilerVersions, contractSpecificSourceData.solcVersionRange, ); const fullSolcVersion = binPaths[solcVersion]; const compilerBinFilename = path.join(SOLC_BIN_DIR, fullSolcVersion); let solcjs: string; const isCompilerAvailableLocally = fs.existsSync(compilerBinFilename); if (isCompilerAvailableLocally) { solcjs = fs.readFileSync(compilerBinFilename).toString(); } else { logUtils.log(`Downloading ${fullSolcVersion}...`); const url = `${constants.BASE_COMPILER_URL}${fullSolcVersion}`; const response = await fetch(url); if (response.status !== 200) { throw new Error(`Failed to load ${fullSolcVersion}`); } solcjs = await response.text(); fs.writeFileSync(compilerBinFilename, solcjs); } const solcInstance = solc.setupMethods(requireFromString(solcjs, compilerBinFilename)); logUtils.log(`Compiling ${contractName} with Solidity v${solcVersion}...`); const contractSource = this._contractSources[contractName]; const source = contractSource.source; const absoluteFilePath = contractSource.absoluteFilePath; const standardInput: solc.StandardInput = { language: 'Solidity', sources: { [absoluteFilePath]: { urls: [`file://${absoluteFilePath}`], }, }, settings: { optimizer: { enabled: this._optimizerEnabled, }, outputSelection: { '*': { '*': [ 'abi', 'evm.bytecode.object', 'evm.bytecode.sourceMap', 'evm.deployedBytecode.object', 'evm.deployedBytecode.sourceMap', ], }, }, }, }; const compiled: solc.StandardOutput = JSON.parse( solcInstance.compileStandardWrapper(JSON.stringify(standardInput), importPath => findImportIfExist(this._contractSources, importPath), ), ); if (!_.isUndefined(compiled.errors)) { const SOLIDITY_WARNING = 'warning'; const errors = _.filter(compiled.errors, entry => entry.severity !== SOLIDITY_WARNING); const warnings = _.filter(compiled.errors, entry => entry.severity === SOLIDITY_WARNING); if (!_.isEmpty(errors)) { errors.forEach(error => { const normalizedErrMsg = getNormalizedErrMsg(error.formattedMessage || error.message); logUtils.log(chalk.red(normalizedErrMsg)); }); process.exit(1); } else { warnings.forEach(warning => { const normalizedWarningMsg = getNormalizedErrMsg(warning.formattedMessage || warning.message); logUtils.log(chalk.yellow(normalizedWarningMsg)); }); } } const compiledData = compiled.contracts[absoluteFilePath][contractName]; if (_.isUndefined(compiledData)) { throw new Error( `Contract ${contractName} not found in ${absoluteFilePath}. Please make sure your contract has the same name as it's file name`, ); } const abi: ContractAbi = compiledData.abi; const bytecode = `0x${compiledData.evm.bytecode.object}`; const runtimeBytecode = `0x${compiledData.evm.deployedBytecode.object}`; const sourceMap = compiledData.evm.bytecode.sourceMap; const sourceMapRuntime = compiledData.evm.deployedBytecode.sourceMap; const sources = _.keys(compiled.sources); const updated_at = Date.now(); const contractNetworkData: ContractNetworkData = { solc_version: solcVersion, keccak256: sourceHash, source_tree_hash: sourceTreeHash, optimizer_enabled: this._optimizerEnabled, abi, bytecode, runtime_bytecode: runtimeBytecode, updated_at, source_map: sourceMap, source_map_runtime: sourceMapRuntime, sources, }; let newArtifact: ContractArtifact; if (!_.isUndefined(currentArtifactIfExists)) { const currentArtifact = currentArtifactIfExists as ContractArtifact; newArtifact = { ...currentArtifact, networks: { ...currentArtifact.networks, [this._networkId]: contractNetworkData, }, }; } else { newArtifact = { contract_name: contractName, networks: { [this._networkId]: contractNetworkData, }, }; } const artifactString = utils.stringifyWithFormatting(newArtifact); const currentArtifactPath = `${this._artifactsDir}/${contractName}.json`; await fsWrapper.writeFileAsync(currentArtifactPath, artifactString); logUtils.log(`${contractName} artifact saved!`); } /** * Gets contract dependendencies and keccak256 hash from source. * @param source Source code of contract. * @return Object with contract dependencies and keccak256 hash of source. */ private _setContractSpecificSourceData(source: string, contractName: string): void { if (!_.isUndefined(this._contractSourceData[contractName])) { return; } const sourceHash = ethUtil.sha3(source); const solcVersionRange = parseSolidityVersionRange(source); const dependencies = parseDependencies(source); const sourceTreeHash = this._getSourceTreeHash(sourceHash, dependencies); this._contractSourceData[contractName] = { dependencies, solcVersionRange, sourceHash, sourceTreeHash, }; } /** * Gets the source tree hash for a file and its dependencies. * @param fileName Name of contract file. */ private _getSourceTreeHash(sourceHash: Buffer, dependencies: string[]): Buffer { if (dependencies.length === 0) { return sourceHash; } else { const dependencySourceTreeHashes = _.map(dependencies, dependency => { const source = this._contractSources[dependency].source; this._setContractSpecificSourceData(source, dependency); const sourceData = this._contractSourceData[dependency]; return this._getSourceTreeHash(sourceData.sourceHash, sourceData.dependencies); }); const sourceTreeHashesBuffer = Buffer.concat([sourceHash, ...dependencySourceTreeHashes]); const sourceTreeHash = ethUtil.sha3(sourceTreeHashesBuffer); return sourceTreeHash; } } }