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// HACK: web3 injects XMLHttpRequest into the global scope and ProviderEngine checks XMLHttpRequest
// to know whether it is running in a browser or node environment. We need it to be undefined since
// we are not running in a browser env.
// Filed issue: https://github.com/ethereum/web3.js/issues/844
(global as any).XMLHttpRequest = undefined;
import ProviderEngine = require('web3-provider-engine');
import RpcSubprovider = require('web3-provider-engine/subproviders/rpc');
import { EmptyWalletSubprovider, FakeGasEstimateSubprovider, GanacheSubprovider } from '@0xproject/subproviders';
import { Provider } from '@0xproject/types';
import * as fs from 'fs';
import * as _ from 'lodash';
import * as process from 'process';
import { constants } from './constants';
import { env, EnvVars } from './env';
export interface Web3Config {
hasAddresses?: boolean; // default: true
shouldUseInProcessGanache?: boolean; // default: false
rpcUrl?: string; // default: localhost:8545
}
export const web3Factory = {
getRpcProvider(config: Web3Config = {}): ProviderEngine {
const provider = new ProviderEngine();
const hasAddresses = _.isUndefined(config.hasAddresses) || config.hasAddresses;
if (!hasAddresses) {
provider.addProvider(new EmptyWalletSubprovider());
}
provider.addProvider(new FakeGasEstimateSubprovider(constants.GAS_ESTIMATE));
const logger = {
log: (arg: any) => {
fs.appendFileSync('ganache.log', `${arg}\n`);
},
};
const shouldUseInProcessGanache = !!config.shouldUseInProcessGanache;
if (shouldUseInProcessGanache) {
if (!_.isUndefined(config.rpcUrl)) {
throw new Error('Cannot use both GanacheSubrovider and RPCSubprovider');
}
provider.addProvider(
new GanacheSubprovider({
logger,
verbose: env.parseBoolean(EnvVars.VerboseGanache),
port: 8545,
network_id: 50,
mnemonic: 'concert load couple harbor equip island argue ramp clarify fence smart topic',
}),
);
} else {
provider.addProvider(
new RpcSubprovider({
rpcUrl: config.rpcUrl || constants.RPC_URL,
}),
);
}
provider.start();
return provider;
},
};
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