import { assert } from '@0xproject/assert'; import { FallthroughResolver, FSResolver, NameResolver, NPMResolver, RelativeFSResolver, Resolver, URLResolver, } from '@0xproject/sol-resolver'; import { fetchAsync, logUtils } from '@0xproject/utils'; import chalk from 'chalk'; import * as ethUtil from 'ethereumjs-util'; import * as fs from 'fs'; 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 { compilerOptionsSchema } from './schemas/compiler_options_schema'; import { binPaths } from './solc/bin_paths'; import { createDirIfDoesNotExistAsync, getContractArtifactIfExistsAsync, getNormalizedErrMsg, parseDependencies, parseSolidityVersionRange, } from './utils/compiler'; import { constants } from './utils/constants'; import { fsWrapper } from './utils/fs_wrapper'; import { CompilerOptions, ContractArtifact, ContractVersionData } from './utils/types'; import { utils } from './utils/utils'; type TYPE_ALL_FILES_IDENTIFIER = '*'; const ALL_CONTRACTS_IDENTIFIER = '*'; const ALL_FILES_IDENTIFIER = '*'; const SOLC_BIN_DIR = path.join(__dirname, '..', '..', 'solc_bin'); const DEFAULT_CONTRACTS_DIR = path.resolve('contracts'); const DEFAULT_ARTIFACTS_DIR = path.resolve('artifacts'); // Solc compiler settings cannot be configured from the commandline. // If you need this configured, please create a `compiler.json` config file // with your desired configurations. const DEFAULT_COMPILER_SETTINGS: solc.CompilerSettings = { optimizer: { enabled: false, }, outputSelection: { [ALL_FILES_IDENTIFIER]: { [ALL_CONTRACTS_IDENTIFIER]: ['abi', 'evm.bytecode.object'], }, }, }; const CONFIG_FILE = 'compiler.json'; interface VersionToInputs { [solcVersion: string]: { standardInput: solc.StandardInput; contractsToCompile: string[]; }; } interface ContractPathToData { [contractPath: string]: ContractData; } interface ContractData { currentArtifactIfExists: ContractArtifact | void; sourceTreeHashHex: string; contractName: string; } /** * The Compiler facilitates compiling Solidity smart contracts and saves the results * to artifact files. */ export class Compiler { private readonly _resolver: Resolver; private readonly _nameResolver: NameResolver; private readonly _contractsDir: string; private readonly _compilerSettings: solc.CompilerSettings; private readonly _artifactsDir: string; private readonly _solcVersionIfExists: string | undefined; private readonly _specifiedContracts: string[] | TYPE_ALL_FILES_IDENTIFIER; private static async _getSolcAsync( solcVersion: string, ): Promise<{ solcInstance: solc.SolcInstance; fullSolcVersion: string }> { const fullSolcVersion = binPaths[solcVersion]; if (_.isUndefined(fullSolcVersion)) { throw new Error(`${solcVersion} is not a known compiler version`); } 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 fetchAsync(url); const SUCCESS_STATUS = 200; if (response.status !== SUCCESS_STATUS) { throw new Error(`Failed to load ${fullSolcVersion}`); } solcjs = await response.text(); fs.writeFileSync(compilerBinFilename, solcjs); } const solcInstance = solc.setupMethods(requireFromString(solcjs, compilerBinFilename)); return { solcInstance, fullSolcVersion }; } /** * Instantiates a new instance of the Compiler class. * @return An instance of the Compiler class. */ constructor(opts?: CompilerOptions) { assert.doesConformToSchema('opts', opts, compilerOptionsSchema); // TODO: Look for config file in parent directories if not found in current directory const config: CompilerOptions = fs.existsSync(CONFIG_FILE) ? JSON.parse(fs.readFileSync(CONFIG_FILE).toString()) : {}; const passedOpts = opts || {}; assert.doesConformToSchema('compiler.json', config, compilerOptionsSchema); this._contractsDir = passedOpts.contractsDir || config.contractsDir || DEFAULT_CONTRACTS_DIR; this._solcVersionIfExists = passedOpts.solcVersion || config.solcVersion; this._compilerSettings = passedOpts.compilerSettings || config.compilerSettings || DEFAULT_COMPILER_SETTINGS; this._artifactsDir = passedOpts.artifactsDir || config.artifactsDir || DEFAULT_ARTIFACTS_DIR; this._specifiedContracts = passedOpts.contracts || config.contracts || ALL_CONTRACTS_IDENTIFIER; this._nameResolver = new NameResolver(path.resolve(this._contractsDir)); const resolver = new FallthroughResolver(); resolver.appendResolver(new URLResolver()); const packagePath = path.resolve(''); resolver.appendResolver(new NPMResolver(packagePath)); resolver.appendResolver(new RelativeFSResolver(this._contractsDir)); resolver.appendResolver(new FSResolver()); resolver.appendResolver(this._nameResolver); this._resolver = resolver; } /** * 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); let contractNamesToCompile: string[] = []; if (this._specifiedContracts === ALL_CONTRACTS_IDENTIFIER) { const allContracts = this._nameResolver.getAll(); contractNamesToCompile = _.map(allContracts, contractSource => path.basename(contractSource.path, constants.SOLIDITY_FILE_EXTENSION), ); } else { contractNamesToCompile = this._specifiedContracts; } return this._compileContractsAsync(contractNamesToCompile); } /** * Compiles contract and saves artifact to artifactsDir. * @param fileName Name of contract with '.sol' extension. */ private async _compileContractsAsync(contractNames: string[]): Promise { // batch input contracts together based on the version of the compiler that they require. const versionToInputs: VersionToInputs = {}; // map contract paths to data about them for later verification and persistence const contractPathToData: ContractPathToData = {}; for (const contractName of contractNames) { const contractSource = this._resolver.resolve(contractName); contractPathToData[contractSource.path] = { contractName, currentArtifactIfExists: await getContractArtifactIfExistsAsync(this._artifactsDir, contractName), sourceTreeHashHex: `0x${this._getSourceTreeHash( path.join(this._contractsDir, contractSource.path), ).toString('hex')}`, }; if (!this._shouldCompile(contractPathToData[contractSource.path])) { continue; } const solcVersion = _.isUndefined(this._solcVersionIfExists) ? semver.maxSatisfying(_.keys(binPaths), parseSolidityVersionRange(contractSource.source)) : this._solcVersionIfExists; if (_.isUndefined(versionToInputs[solcVersion])) { // no inputs batched yet for this version. // prepare object to hold this batch. versionToInputs[solcVersion] = { standardInput: { language: 'Solidity', sources: {}, settings: this._compilerSettings, }, contractsToCompile: [], }; } // add input to the right version batch versionToInputs[solcVersion].standardInput.sources[contractSource.path] = { content: contractSource.source, }; versionToInputs[solcVersion].contractsToCompile.push(contractSource.path); } for (const solcVersion of _.keys(versionToInputs)) { const input = versionToInputs[solcVersion]; logUtils.log( `Compiling ${input.contractsToCompile.length} contracts (${ input.contractsToCompile }) with Solidity v${solcVersion}...`, ); const { solcInstance, fullSolcVersion } = await Compiler._getSolcAsync(solcVersion); const compilerOutput = this._compile(solcInstance, input.standardInput); for (const contractPath of input.contractsToCompile) { await this._verifyAndPersistCompiledContractAsync( contractPath, contractPathToData[contractPath], fullSolcVersion, compilerOutput, ); } } } private _shouldCompile(contractData: ContractData): boolean { if (_.isUndefined(contractData.currentArtifactIfExists)) { return true; } else { const currentArtifact = contractData.currentArtifactIfExists as ContractArtifact; const isUserOnLatestVersion = currentArtifact.schemaVersion === constants.LATEST_ARTIFACT_VERSION; const didCompilerSettingsChange = !_.isEqual(currentArtifact.compiler.settings, this._compilerSettings); const didSourceChange = currentArtifact.sourceTreeHashHex !== contractData.sourceTreeHashHex; return !isUserOnLatestVersion || didCompilerSettingsChange || didSourceChange; } } private async _verifyAndPersistCompiledContractAsync( contractPath: string, contractMetadata: ContractData, fullSolcVersion: string, compilerOutput: solc.StandardOutput, ): Promise { const contractName = contractMetadata.contractName; const sourceTreeHashHex = contractMetadata.sourceTreeHashHex; const currentArtifactIfExists = contractMetadata.currentArtifactIfExists; const compiledData = compilerOutput.contracts[contractPath][contractName]; if (_.isUndefined(compiledData)) { throw new Error( `Contract ${contractName} not found in ${contractPath}. Please make sure your contract has the same name as it's file name`, ); } if (!_.isUndefined(compiledData.evm)) { if (!_.isUndefined(compiledData.evm.bytecode) && !_.isUndefined(compiledData.evm.bytecode.object)) { compiledData.evm.bytecode.object = ethUtil.addHexPrefix(compiledData.evm.bytecode.object); } if ( !_.isUndefined(compiledData.evm.deployedBytecode) && !_.isUndefined(compiledData.evm.deployedBytecode.object) ) { compiledData.evm.deployedBytecode.object = ethUtil.addHexPrefix( compiledData.evm.deployedBytecode.object, ); } } const sourceCodes = _.mapValues( compilerOutput.sources, (_1, sourceFilePath) => this._resolver.resolve(sourceFilePath).source, ); const contractVersion: ContractVersionData = { compilerOutput: compiledData, sources: compilerOutput.sources, sourceCodes, sourceTreeHashHex, compiler: { name: 'solc', version: fullSolcVersion, settings: this._compilerSettings, }, }; let newArtifact: ContractArtifact; if (!_.isUndefined(currentArtifactIfExists)) { const currentArtifact = currentArtifactIfExists as ContractArtifact; newArtifact = { ...currentArtifact, ...contractVersion, }; } else { newArtifact = { schemaVersion: constants.LATEST_ARTIFACT_VERSION, contractName, ...contractVersion, networks: {}, }; } const artifactString = utils.stringifyWithFormatting(newArtifact); const currentArtifactPath = `${this._artifactsDir}/${contractName}.json`; await fsWrapper.writeFileAsync(currentArtifactPath, artifactString); logUtils.log(`${contractName} artifact saved!`); } private _compile(solcInstance: solc.SolcInstance, standardInput: solc.StandardInput): solc.StandardOutput { const compiled: solc.StandardOutput = JSON.parse( solcInstance.compileStandardWrapper(JSON.stringify(standardInput), importPath => { const sourceCodeIfExists = this._resolver.resolve(importPath); return { contents: sourceCodeIfExists.source }; }), ); 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)); }); throw new Error('Compilation errors encountered'); } else { warnings.forEach(warning => { const normalizedWarningMsg = getNormalizedErrMsg(warning.formattedMessage || warning.message); logUtils.log(chalk.yellow(normalizedWarningMsg)); }); } } return compiled; } /** * Gets the source tree hash for a file and its dependencies. * @param fileName Name of contract file. */ private _getSourceTreeHash(importPath: string): Buffer { const contractSource = this._resolver.resolve(importPath); const dependencies = parseDependencies(contractSource); const sourceHash = ethUtil.sha3(contractSource.source); if (dependencies.length === 0) { return sourceHash; } else { const dependencySourceTreeHashes = _.map(dependencies, (dependency: string) => this._getSourceTreeHash(dependency), ); const sourceTreeHashesBuffer = Buffer.concat([sourceHash, ...dependencySourceTreeHashes]); const sourceTreeHash = ethUtil.sha3(sourceTreeHashesBuffer); return sourceTreeHash; } } }