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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| import type * as http from 'http'; | ||
| import { createSession } from 'better-sse'; | ||
| import * as EventSource from 'eventsource'; | ||
| import * as express from 'express'; | ||
| import * as getPort from 'get-port'; | ||
| import { createAppWithPath, createProxyMiddleware } from './test-kit'; | ||
| import { RequestHandler } from '../../src'; | ||
|
|
||
| describe('E2E SSE proxy', () => { | ||
| let proxyServer: http.Server; | ||
| let targetSSEServer: http.Server; | ||
|
|
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| const targetSSEApp = express(); | ||
|
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| targetSSEApp.get('/sse', async (req, res) => { | ||
| const session = await createSession(req, res); | ||
|
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| // push 4x messages to client (stop character: Ø) | ||
| '123Ø'.split('').forEach((val, index) => { | ||
| setTimeout(() => { | ||
| session.push(`Hello world! (sse message #${val})`); | ||
| }, index * 100); | ||
| }); | ||
| }); | ||
|
|
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| let sseProxyMiddleware: RequestHandler; | ||
|
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| beforeEach(async () => { | ||
| const targetSSEServerPort = await getPort(); | ||
|
|
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| return new Promise((resolve: any) => { | ||
| sseProxyMiddleware = createProxyMiddleware({ | ||
| target: `http://localhost:${targetSSEServerPort}/sse`, | ||
| }); | ||
|
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| targetSSEServer = targetSSEApp.listen(targetSSEServerPort, resolve); | ||
| }); | ||
| }); | ||
|
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| afterEach(() => { | ||
| return Promise.all([ | ||
| new Promise((resolve) => targetSSEServer.close(resolve)), | ||
| new Promise((resolve) => proxyServer.close(resolve)), | ||
| ]); | ||
| }); | ||
|
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||
| it('should proxy SSE request', async () => { | ||
| const freePort = await getPort(); | ||
| proxyServer = createAppWithPath('/sse', sseProxyMiddleware).listen(freePort); | ||
|
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| const sse = new EventSource(`http://localhost:${freePort}/sse`); | ||
|
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| async function* receiveSseMessages() { | ||
| while (true) { | ||
| const message: string = await new Promise((resolve, reject) => { | ||
| sse.addEventListener('message', ({ data }) => resolve(data)); | ||
| sse.addEventListener('error', (err) => reject(err)); | ||
| }); | ||
|
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| yield message; | ||
|
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| // stop generator | ||
| if (message.includes('#Ø')) { | ||
| return; | ||
| } | ||
| } | ||
| } | ||
|
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| const receivedMessages: string[] = []; | ||
|
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| for await (const message of receiveSseMessages()) { | ||
| receivedMessages.push(message); | ||
| } | ||
|
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| expect(receivedMessages).toMatchInlineSnapshot(` | ||
| [ | ||
| ""Hello world! (sse message #1)"", | ||
| ""Hello world! (sse message #2)"", | ||
| ""Hello world! (sse message #3)"", | ||
| ""Hello world! (sse message #Ø)"", | ||
| ] | ||
| `); | ||
|
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||
| sse.close(); | ||
| }); | ||
| }); |
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