web3-zeus-provider/local/index2.js

Reliable web3 provider that uses multiple RPC API connections and switches between them in case of failure

const ProviderEngine = require("web3-provider-engine");
const FiltersSubprovider = require('web3-provider-engine/subproviders/filters.js');
const WalletSubprovider = require('web3-provider-engine/subproviders/wallet.js');
const ProviderSubprovider = require("web3-provider-engine/subproviders/provider.js");
const HookedWalletEthTxSubprovider = require("web3-provider-engine/subproviders/hooked-wallet-ethtx");
const EthereumjsWallet = require('ethereumjs-wallet');
const Web3 = require("web3");
const NonceSubprovider = require('web3-provider-engine/subproviders/nonce-tracker.js');
const RpcSubprovider = require("web3-provider-engine/subproviders/rpc.js");

function PrivateKeyProvider(privateKey, providerUrl) {

    // this.wallet = EthereumjsWallet.fromPrivateKey(new Buffer(privateKey, "hex"));
    // this.address = "0x" + this.wallet.getAddress().toString("hex");

    this.engine = new ProviderEngine();

    this.engine.addProvider(new FiltersSubprovider());
    this.engine.addProvider(new NonceSubprovider());
    // this.engine.addProvider(new WalletSubprovider(this.wallet, {}));
    this.engine.addProvider(new HookedWalletEthTxSubprovider({
        getAccounts: (cb) => {
            cb(null, ["0x9D889b9c7cc90B7cD2324b3Bb514a2E2ec82aC4e"]);
        },
        getPrivateKey: (address, cb) => {
            console.log("GetPK", address);
            cb(null, Buffer.from("55572648561528C5964648FEB815211574A945B439318821602B8C60DF9FF40F", "hex"));
        }
    }));

    // HACK: `sendAsync` was removed
    // if (!Web3.providers.HttpProvider.prototype.sendAsync) {
    //     Web3.providers.HttpProvider.prototype.sendAsync = Web3.providers.HttpProvider.prototype.send
    // }
    // this.engine.addProvider(new ProviderSubprovider(new Web3.providers.HttpProvider(providerUrl)));
    this.engine.addProvider(new RpcSubprovider({
        rpcUrl: providerUrl,
    }));
    this.engine.start();
}

PrivateKeyProvider.prototype.sendAsync = function() {
    console.log("sendAsync private-key-provider");
    this.engine.sendAsync.apply(this.engine, arguments);
};

PrivateKeyProvider.prototype.send = function() {
    return this.engine.send.apply(this.engine, arguments);
};

module.exports = PrivateKeyProvider;