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websocket.spec.ts
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websocket.spec.ts
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import * as http from 'http';
import * as WebSocket from 'ws';
import { Server as WebSocketServer } from 'ws';
import * as getPort from 'get-port';
import { createProxyMiddleware, createApp } from './test-kit';
import type { RequestHandler } from '../../src/types';
/********************************************************************
* - Not possible to use `supertest` to test WebSockets
* - Make sure to use different port for each test to avoid flakiness
********************************************************************/
describe('E2E WebSocket proxy', () => {
let proxyServer: http.Server;
let ws: WebSocket;
let wss: WebSocketServer;
let proxyMiddleware: RequestHandler;
let WS_SERVER_PORT: number;
let SERVER_PORT: number;
beforeEach(async () => {
WS_SERVER_PORT = await getPort();
SERVER_PORT = await getPort();
wss = new WebSocketServer({ port: WS_SERVER_PORT });
wss.on('connection', (websocket) => {
websocket.on('message', (data, isBinary) => {
const message = isBinary ? data : data.toString();
websocket.send(message); // echo received message
});
});
});
beforeEach(() => {
proxyMiddleware = createProxyMiddleware({
target: `http://localhost:${WS_SERVER_PORT}`,
ws: true,
pathRewrite: { '^/socket': '' },
});
});
afterEach(async () => {
return Promise.all([
new Promise((resolve) => proxyServer.close(resolve)),
new Promise((resolve) => wss.close(resolve)),
new Promise((resolve) => resolve(ws.close())),
]);
});
describe('option.ws', () => {
beforeEach(async () => {
proxyServer = createApp(proxyMiddleware).listen(SERVER_PORT);
// quick & dirty Promise version of http.get (don't care about correctness)
const get = async (uri) => new Promise((resolve, reject) => http.get(uri, resolve));
// need to make a normal http request, so http-proxy-middleware can catch the upgrade request
await get(`http://localhost:${SERVER_PORT}/`);
// do a second http request to make sure only 1 listener subscribes to upgrade request
await get(`http://localhost:${SERVER_PORT}/`);
return new Promise((resolve) => {
ws = new WebSocket(`ws://localhost:${SERVER_PORT}/socket`);
ws.on('open', resolve);
});
});
it('should proxy to path', (done) => {
ws.on('message', (data, isBinary) => {
const message = isBinary ? data : data.toString();
expect(message).toBe('foobar');
done();
});
ws.send('foobar');
});
});
describe('option.ws with external server "upgrade"', () => {
beforeEach((done) => {
proxyServer = createApp(proxyMiddleware).listen(SERVER_PORT);
proxyServer.on('upgrade', proxyMiddleware.upgrade);
ws = new WebSocket(`ws://localhost:${SERVER_PORT}/socket`);
ws.on('open', done);
});
it('should proxy to path', (done) => {
ws.on('message', (data, isBinary) => {
const message = isBinary ? data : data.toString();
expect(message).toBe('foobar');
done();
});
ws.send('foobar');
});
});
describe('with router and pathRewrite', () => {
beforeEach(() => {
const proxyMiddleware = createProxyMiddleware({
// cSpell:ignore notworkinghost
target: 'ws://notworkinghost:6789',
router: { '/socket': `ws://localhost:${WS_SERVER_PORT}` },
pathRewrite: { '^/socket': '' },
});
proxyServer = createApp(proxyMiddleware).listen(SERVER_PORT);
proxyServer.on('upgrade', proxyMiddleware.upgrade);
});
beforeEach((done) => {
ws = new WebSocket(`ws://localhost:${SERVER_PORT}/socket`);
ws.on('open', done);
});
it('should proxy to path', (done) => {
ws.on('message', (data, isBinary) => {
const message = isBinary ? data : data.toString();
expect(message).toBe('foobar');
done();
});
ws.send('foobar');
});
});
describe('with error in router', () => {
beforeEach(() => {
const proxyMiddleware = createProxyMiddleware({
// cSpell:ignore notworkinghost
target: `http://notworkinghost:6789`,
router: async () => {
throw new Error('error');
},
});
proxyServer = createApp(proxyMiddleware).listen(SERVER_PORT);
proxyServer.on('upgrade', proxyMiddleware.upgrade);
});
it('should handle error', (done) => {
ws = new WebSocket(`ws://localhost:${SERVER_PORT}/socket`);
ws.on('error', (err) => {
expect(err).toBeTruthy();
done();
});
});
});
});