import { ContractAbi } from '@0xproject/types'; import { logUtils, promisify } from '@0xproject/utils'; 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 { createArtifactsDirIfDoesNotExistAsync, 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 = '*'; /** * 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 _solcErrors: Set = new Set(); 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}`; if (path.extname(fileName) === constants.SOLIDITY_FILE_EXTENSION) { try { const opts = { encoding: 'utf8', }; const source = await fsWrapper.readFileAsync(contentPath, opts); sources[fileName] = source; logUtils.log(`Reading ${fileName} 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 ${constants.SOLIDITY_FILE_EXTENSION} file`); } } } return sources; } /** * Instantiates a new instance of the Compiler class. * @param opts Options specifying directories, network, and optimization settings. * @return An instance of the Compiler class. */ constructor(opts: CompilerOptions) { this._contractsDir = opts.contractsDir; this._networkId = opts.networkId; this._optimizerEnabled = opts.optimizerEnabled; this._artifactsDir = opts.artifactsDir; this._specifiedContracts = opts.specifiedContracts; } /** * Compiles selected Solidity files found in `contractsDir` and writes JSON artifacts to `artifactsDir`. */ public async compileAsync(): Promise { await createArtifactsDirIfDoesNotExistAsync(this._artifactsDir); this._contractSources = await Compiler._getContractSourcesAsync(this._contractsDir); _.forIn(this._contractSources, this._setContractSpecificSourceData.bind(this)); const fileNames = this._specifiedContracts.has(ALL_CONTRACTS_IDENTIFIER) ? _.keys(this._contractSources) : Array.from(this._specifiedContracts.values()); for (const fileName of fileNames) { await this._compileContractAsync(fileName); } this._solcErrors.forEach(errMsg => { logUtils.log(errMsg); }); } /** * Compiles contract and saves artifact to artifactsDir. * @param fileName Name of contract with '.sol' extension. */ private async _compileContractAsync(fileName: string): Promise { if (_.isUndefined(this._contractSources)) { throw new Error('Contract sources not yet initialized'); } const contractSpecificSourceData = this._contractSourceData[fileName]; const currentArtifactIfExists = await getContractArtifactIfExistsAsync(this._artifactsDir, fileName); const sourceHash = `0x${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(__dirname, '../../solc_bin', 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 ${fileName} with Solidity v${solcVersion}...`); const source = this._contractSources[fileName]; const input = { [fileName]: source, }; const sourcesToCompile = { sources: input, }; const compiled = solcInstance.compile(sourcesToCompile, Number(this._optimizerEnabled), importPath => findImportIfExist(this._contractSources, importPath), ); if (!_.isUndefined(compiled.errors)) { _.forEach(compiled.errors, errMsg => { const normalizedErrMsg = getNormalizedErrMsg(errMsg); this._solcErrors.add(normalizedErrMsg); }); } const contractName = path.basename(fileName, constants.SOLIDITY_FILE_EXTENSION); const contractIdentifier = `${fileName}:${contractName}`; if (_.isUndefined(compiled.contracts[contractIdentifier])) { throw new Error( `Contract ${contractName} not found in ${fileName}. Please make sure your contract has the same name as it's file name`, ); } const abi: ContractAbi = JSON.parse(compiled.contracts[contractIdentifier].interface); const bytecode = `0x${compiled.contracts[contractIdentifier].bytecode}`; const runtimeBytecode = `0x${compiled.contracts[contractIdentifier].runtimeBytecode}`; const sourceMap = compiled.contracts[contractIdentifier].srcmap; const sourceMapRuntime = compiled.contracts[contractIdentifier].srcmapRuntime; const sources = _.keys(compiled.sources); const updated_at = Date.now(); const contractNetworkData: ContractNetworkData = { solc_version: solcVersion, keccak256: sourceHash, source_tree_hash: sourceTreeHash, optimizer_enabled: this._optimizerEnabled, abi, bytecode, runtime_bytecode: runtimeBytecode, updated_at, source_map: sourceMap, source_map_runtime: sourceMapRuntime, sources, }; let newArtifact: ContractArtifact; if (!_.isUndefined(currentArtifactIfExists)) { const currentArtifact = currentArtifactIfExists as ContractArtifact; newArtifact = { ...currentArtifact, networks: { ...currentArtifact.networks, [this._networkId]: contractNetworkData, }, }; } else { newArtifact = { contract_name: contractName, networks: { [this._networkId]: contractNetworkData, }, }; } const artifactString = utils.stringifyWithFormatting(newArtifact); const currentArtifactPath = `${this._artifactsDir}/${contractName}.json`; await fsWrapper.writeFileAsync(currentArtifactPath, artifactString); logUtils.log(`${fileName} 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, fileName: string): void { if (!_.isUndefined(this._contractSourceData[fileName])) { return; } const sourceHash = ethUtil.sha3(source); const solcVersionRange = parseSolidityVersionRange(source); const dependencies = parseDependencies(source); const sourceTreeHash = this._getSourceTreeHash(fileName, sourceHash, dependencies); this._contractSourceData[fileName] = { dependencies, solcVersionRange, sourceHash, sourceTreeHash, }; } /** * Gets the source tree hash for a file and its dependencies. * @param fileName Name of contract file. */ private _getSourceTreeHash(fileName: string, sourceHash: Buffer, dependencies: string[]): Buffer { if (dependencies.length === 0) { return sourceHash; } else { const dependencySourceTreeHashes = _.map(dependencies, dependency => { const source = this._contractSources[dependency]; this._setContractSpecificSourceData(source, dependency); const sourceData = this._contractSourceData[dependency]; return this._getSourceTreeHash(dependency, sourceData.sourceHash, sourceData.dependencies); }); const sourceTreeHashesBuffer = Buffer.concat([sourceHash, ...dependencySourceTreeHashes]); const sourceTreeHash = ethUtil.sha3(sourceTreeHashesBuffer); return sourceTreeHash; } } }