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<string>;
/**
* 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<ContractSources> {
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<void> {
await this._createArtifactsDirIfDoesNotExistAsync();
this._contractSourcesIfExists = await Compiler._getContractSourcesAsync(this._contractsDir);
const contractBaseNames = _.keys(this._contractSourcesIfExists);
const compiledContractPromises = _.map(contractBaseNames, async (contractBaseName: string): Promise<void> => {
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<void> {
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<void> {
if (!fsWrapper.doesPathExistSync(this._artifactsDir)) {
utils.consoleLog('Creating artifacts directory...');
await fsWrapper.mkdirAsync(this._artifactsDir);
}
}
}
