import * as ethUtil from 'ethereumjs-util'; import * as _ from 'lodash'; import * as path from 'path'; import solc = require('solc'); import * as Web3 from 'web3'; import { binPaths } from './solc/bin_paths'; import { fsWrapper } from './utils/fs_wrapper'; import { CompilerOptions, ContractArtifact, ContractData, ContractNetworks, ContractSources, ImportContents, } from './utils/types'; import { utils } from './utils/utils'; const SOLIDITY_FILE_EXTENSION = '.sol'; export class Compiler { private _contractsDir: string; private _networkId: number; private _optimizerEnabled: number; private _artifactsDir: string; private _contractSourcesIfExists?: ContractSources; private _solcErrors: Set; /** * Recursively retrieves Solidity source code from directory. * @param dirPath Directory to search. * @return Mapping of contract name 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 ${dirPath}`); } let sources: ContractSources = {}; for (const name of dirContents) { const contentPath = `${dirPath}/${name}`; if (path.extname(name) === SOLIDITY_FILE_EXTENSION) { try { const opts = { encoding: 'utf8', }; sources[name] = await fsWrapper.readFileAsync(contentPath, opts); utils.consoleLog(`Reading ${name} source...`); } catch (err) { utils.consoleLog(`Could not find file at ${contentPath}`); } } else { try { const nestedSources = await Compiler._getContractSourcesAsync(contentPath); sources = { ...sources, ...nestedSources, }; } catch (err) { utils.consoleLog(`${contentPath} is not a directory or ${SOLIDITY_FILE_EXTENSION} file`); } } } return sources; } /** * Searches Solidity source code for compiler version. * @param source Source code of contract. * @return Solc compiler version. */ private static _parseSolidityVersion(source: string): string { const solcVersionMatch = source.match(/(?:solidity\s\^?)([0-9]{1,2}[.][0-9]{1,2}[.][0-9]{1,2})/); if (_.isNull(solcVersionMatch)) { throw new Error('Could not find Solidity version in source'); } const solcVersion = solcVersionMatch[1]; return solcVersion; } /** * Normalizes the path found in the error message. * Example: converts 'base/Token.sol:6:46: Warning: Unused local variable' * to 'Token.sol:6:46: Warning: Unused local variable' * This is used to prevent logging the same error multiple times. * @param errMsg An error message from the compiled output. * @return The error message with directories truncated from the contract path. */ private static _getNormalizedErrMsg(errMsg: string): string { const errPathMatch = errMsg.match(/(.*\.sol)/); if (_.isNull(errPathMatch)) { throw new Error('Could not find a path in error message'); } const errPath = errPathMatch[0]; const baseContract = path.basename(errPath); const normalizedErrMsg = errMsg.replace(errPath, baseContract); return normalizedErrMsg; } /** * 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._solcErrors = new Set(); } /** * Compiles all Solidity files found in contractsDir and writes JSON artifacts to artifactsDir. */ public async compileAllAsync(): Promise { await this._createArtifactsDirIfDoesNotExistAsync(); this._contractSourcesIfExists = await Compiler._getContractSourcesAsync(this._contractsDir); const contractBaseNames = _.keys(this._contractSourcesIfExists); const compiledContractPromises = _.map(contractBaseNames, async (contractBaseName: string): Promise => { return this._compileContractAsync(contractBaseName); }); await Promise.all(compiledContractPromises); this._solcErrors.forEach(errMsg => { utils.consoleLog(errMsg); }); } /** * Compiles contract and saves artifact to artifactsDir. * @param contractBaseName Name of contract with '.sol' extension. */ private async _compileContractAsync(contractBaseName: string): Promise { if (_.isUndefined(this._contractSourcesIfExists)) { throw new Error('Contract sources not yet initialized'); } const source = this._contractSourcesIfExists[contractBaseName]; const contractName = path.basename(contractBaseName, SOLIDITY_FILE_EXTENSION); const currentArtifactPath = `${this._artifactsDir}/${contractName}.json`; const sourceHash = `0x${ethUtil.sha3(source).toString('hex')}`; let currentArtifactString: string; let currentArtifact: ContractArtifact; let oldNetworks: ContractNetworks; let shouldCompile: boolean; try { const opts = { encoding: 'utf8', }; currentArtifactString = await fsWrapper.readFileAsync(currentArtifactPath, opts); currentArtifact = JSON.parse(currentArtifactString); oldNetworks = currentArtifact.networks; const oldNetwork: ContractData = oldNetworks[this._networkId]; shouldCompile = _.isUndefined(oldNetwork) || oldNetwork.keccak256 !== sourceHash || oldNetwork.optimizer_enabled !== this._optimizerEnabled; } catch (err) { shouldCompile = true; } if (!shouldCompile) { return; } const input = { [contractBaseName]: source, }; const solcVersion = Compiler._parseSolidityVersion(source); const fullSolcVersion = binPaths[solcVersion]; const solcBinPath = `./solc/solc_bin/${fullSolcVersion}`; const solcBin = require(solcBinPath); const solcInstance = solc.setupMethods(solcBin); utils.consoleLog(`Compiling ${contractBaseName}...`); const sourcesToCompile = { sources: input, }; const compiled = solcInstance.compile( sourcesToCompile, this._optimizerEnabled, this._findImportsIfSourcesExist.bind(this), ); if (!_.isUndefined(compiled.errors)) { _.each(compiled.errors, errMsg => { const normalizedErrMsg = Compiler._getNormalizedErrMsg(errMsg); this._solcErrors.add(normalizedErrMsg); }); } const contractIdentifier = `${contractBaseName}:${contractName}`; const abi: Web3.ContractAbi = JSON.parse(compiled.contracts[contractIdentifier].interface); const unlinked_binary = `0x${compiled.contracts[contractIdentifier].bytecode}`; const updated_at = Date.now(); const contractData: ContractData = { solc_version: solcVersion, keccak256: sourceHash, optimizer_enabled: this._optimizerEnabled, abi, unlinked_binary, updated_at, }; let newArtifact: ContractArtifact; if (!_.isUndefined(currentArtifactString)) { newArtifact = { ...currentArtifact, networks: { ...oldNetworks, [this._networkId]: contractData, }, }; } else { newArtifact = { contract_name: contractName, networks: { [this._networkId]: contractData, }, }; } const artifactString = utils.stringifyWithFormatting(newArtifact); await fsWrapper.writeFileAsync(currentArtifactPath, artifactString); utils.consoleLog(`${contractBaseName} artifact saved!`); } /** * Callback to resolve dependencies with `solc.compile`. * Throws error if contractSources not yet initialized. * @param importPath Path to an imported dependency. * @return Import contents object containing source code of dependency. */ private _findImportsIfSourcesExist(importPath: string): ImportContents { if (_.isUndefined(this._contractSourcesIfExists)) { throw new Error('Contract sources not yet initialized'); } const contractBaseName = path.basename(importPath); const source = this._contractSourcesIfExists[contractBaseName]; const importContents: ImportContents = { contents: source, }; return importContents; } /** * Creates the artifacts directory if it does not already exist. */ private async _createArtifactsDirIfDoesNotExistAsync(): Promise { if (!fsWrapper.doesPathExistSync(this._artifactsDir)) { utils.consoleLog('Creating artifacts directory...'); await fsWrapper.mkdirAsync(this._artifactsDir); } } }