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import { DoneCallback } from '@0xproject/types';
import * as chai from 'chai';
import { JSONRPCResponsePayload } from 'ethereum-types';
import * as Sinon from 'sinon';
import Web3ProviderEngine = require('web3-provider-engine');
import RpcSubprovider = require('web3-provider-engine/subproviders/rpc');
import { RedundantSubprovider } from '../../src';
import { Subprovider } from '../../src/subproviders/subprovider';
import { chaiSetup } from '../chai_setup';
import { ganacheSubprovider } from '../utils/ganache_subprovider';
import { reportCallbackErrors } from '../utils/report_callback_errors';
const expect = chai.expect;
chaiSetup.configure();
const DEFAULT_NUM_ACCOUNTS = 10;
describe('RedundantSubprovider', () => {
let provider: Web3ProviderEngine;
it('succeeds when supplied a healthy endpoint', (done: DoneCallback) => {
provider = new Web3ProviderEngine();
const subproviders = [ganacheSubprovider];
const redundantSubprovider = new RedundantSubprovider(subproviders);
provider.addProvider(redundantSubprovider);
provider.start();
const payload = {
jsonrpc: '2.0',
method: 'eth_accounts',
params: [],
id: 1,
};
const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
expect(err).to.be.a('null');
expect(response.result.length).to.be.equal(DEFAULT_NUM_ACCOUNTS);
done();
});
provider.sendAsync(payload, callback);
});
it('succeeds when supplied at least one healthy endpoint', (done: DoneCallback) => {
provider = new Web3ProviderEngine();
const nonExistentSubprovider = new RpcSubprovider({
rpcUrl: 'http://does-not-exist:3000',
});
const handleRequestStub = Sinon.stub(nonExistentSubprovider, 'handleRequest').throws(
new Error('REQUEST_FAILED'),
);
const subproviders = [nonExistentSubprovider as Subprovider, ganacheSubprovider];
const redundantSubprovider = new RedundantSubprovider(subproviders);
provider.addProvider(redundantSubprovider);
provider.start();
const payload = {
jsonrpc: '2.0',
method: 'eth_accounts',
params: [],
id: 1,
};
const callback = reportCallbackErrors(done)((err: Error, response: JSONRPCResponsePayload) => {
expect(err).to.be.a('null');
expect(response.result.length).to.be.equal(DEFAULT_NUM_ACCOUNTS);
handleRequestStub.restore();
done();
});
provider.sendAsync(payload, callback);
});
});
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