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import {
EmptyWalletSubprovider,
FakeGasEstimateSubprovider,
GanacheSubprovider,
RPCSubprovider,
Web3ProviderEngine,
} from '@0x/subproviders';
import * as fs from 'fs';
import * as _ from 'lodash';
import { constants } from './constants';
import { env, EnvVars } from './env';
export interface Web3Config {
hasAddresses?: boolean; // default: true
shouldUseInProcessGanache?: boolean; // default: false
shouldThrowErrorsOnGanacheRPCResponse?: boolean; // default: true
rpcUrl?: string; // default: localhost:8545
shouldUseFakeGasEstimate?: boolean; // default: true
}
export const web3Factory = {
getRpcProvider(config: Web3Config = {}): Web3ProviderEngine {
const provider = new Web3ProviderEngine();
const hasAddresses = _.isUndefined(config.hasAddresses) || config.hasAddresses;
config.shouldUseFakeGasEstimate =
_.isUndefined(config.shouldUseFakeGasEstimate) || config.shouldUseFakeGasEstimate;
if (!hasAddresses) {
provider.addProvider(new EmptyWalletSubprovider());
}
if (config.shouldUseFakeGasEstimate) {
provider.addProvider(new FakeGasEstimateSubprovider(constants.GAS_LIMIT));
}
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');
}
const shouldThrowErrorsOnGanacheRPCResponse =
_.isUndefined(config.shouldThrowErrorsOnGanacheRPCResponse) ||
config.shouldThrowErrorsOnGanacheRPCResponse;
provider.addProvider(
new GanacheSubprovider({
vmErrorsOnRPCResponse: shouldThrowErrorsOnGanacheRPCResponse,
gasLimit: constants.GAS_LIMIT,
logger,
verbose: env.parseBoolean(EnvVars.VerboseGanache),
port: 8545,
network_id: 50,
mnemonic: 'concert load couple harbor equip island argue ramp clarify fence smart topic',
} as any), // TODO remove any once types are merged in DefinitelyTyped
);
} else {
provider.addProvider(new RPCSubprovider(config.rpcUrl || constants.RPC_URL));
}
provider.start();
return provider;
},
};
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