diff --git a/README.md b/README.md
index bc13e76..392884c 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,8 @@ Table of Contents:
- [Revision](#revision)
- [Anatomy of an Engine.IO session](#anatomy-of-an-engineio-session)
+ - [Sample session](#sample-session)
+ - [Sample session with WebSocket only](#sample-session-with-websocket-only)
- [URLs](#urls)
- [Encoding](#encoding)
- [Packet](#packet)
@@ -29,6 +31,7 @@ Table of Contents:
- [Transport upgrading](#transport-upgrading)
- [Timeouts](#timeouts)
- [Difference between v2 and v3](#difference-between-v2-and-v3)
+- [Test suite](#test-suite)
## Revision
@@ -52,7 +55,7 @@ with `pong` packets.
5. Polling transports can send a `close` packet to close the socket, since
they're expected to be "opening" and "closing" all the time.
-Example:
+### Sample session
- Request n°1 (open packet)
@@ -72,8 +75,12 @@ Details:
{"sid":... => the handshake data
```
+Note: the `t` query param is used to ensure that the request is not cached by the browser.
+
- Request n°2 (message in):
+`socket.send('hey')` is executed on the server:
+
```
GET /engine.io/?EIO=3&transport=polling&t=N8hyd7H&sid=lv_VI97HAXpY6yYWAAAC
< HTTP/1.1 200 OK
@@ -92,6 +99,8 @@ hey => the actual message
- Request n°3 (message out)
+`socket.send('hello'); socket.send('world');` is executed on the client:
+
```
POST /engine.io/?EIO=3&transport=polling&t=N8hzxke&sid=lv_VI97HAXpY6yYWAAAC
> Content-Type: text/plain; charset=UTF-8
@@ -134,6 +143,28 @@ WebSocket frames:
> 1 => "close" packet type
```
+### Sample session with WebSocket only
+
+In that case, the client only enables WebSocket (without HTTP polling).
+
+```
+GET /engine.io/?EIO=3&transport=websocket
+< HTTP/1.1 101 Switching Protocols
+```
+
+WebSocket frames:
+
+```
+< 0{"sid":"lv_VI97HAXpY6yYWAAAC","pingInterval":25000,"pingTimeout":5000} => handshake
+< 4hey
+> 4hello => message (not concatenated)
+> 4world
+< 2 => "ping" packet type
+> 3 => "pong" packet type
+> 1 => "close" packet type
+```
+
+
## URLs
An Engine.IO url is composed as follows:
@@ -333,7 +364,7 @@ Please note that we are not counting bytes, but characters, hence 2 (1 + 1) inst
is encoded to:
```
-buffer <00 04 ff 34 e2 82 ac 01 04 ff 01 02 03 04>
+buffer <00 04 ff 34 e2 82 ac 01 05 ff 04 01 02 03 04>
with:
@@ -343,8 +374,9 @@ ff => separator
34 => "message" packet type ("4")
e2 82 ac => "€"
01 => binary header
-04 => buffer length in bytes
+05 => buffer length in bytes
ff => separator
+04 => "message" packet type (4)
01 02 03 04 => buffer content
```
@@ -481,3 +513,34 @@ does not receive any data within `pingTimeout + pingInterval`.
- add support for binary data
v2 is included in Socket.IO v0.9, while v3 is included in Socket.IO v1/v2.
+
+## Test suite
+
+The test suite in the `test-suite/` directory lets you check the compliance of a server implementation.
+
+Usage:
+
+- in Node.js: `npm ci && npm test`
+- in a browser: simply open the `index.html` file in your browser
+
+For reference, here is expected configuration for the JavaScript server to pass all tests:
+
+```js
+import { listen } from "engine.io";
+
+const server = listen(3000, {
+ pingInterval: 300,
+ pingTimeout: 200,
+ allowEIO3: true,
+ maxPayload: 1e6,
+ cors: {
+ origin: "*"
+ }
+});
+
+server.on("connection", socket => {
+ socket.on("data", (...args) => {
+ socket.send(...args);
+ });
+});
+```
diff --git a/test-suite/.gitignore b/test-suite/.gitignore
new file mode 100755
index 0000000..3c3629e
--- /dev/null
+++ b/test-suite/.gitignore
@@ -0,0 +1 @@
+node_modules
diff --git a/test-suite/index.html b/test-suite/index.html
new file mode 100644
index 0000000..1ac561c
--- /dev/null
+++ b/test-suite/index.html
@@ -0,0 +1,30 @@
+
+
+
+
+
+
+ Test suite for the Engine.IO protocol
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/test-suite/node-imports.js b/test-suite/node-imports.js
new file mode 100644
index 0000000..fc509aa
--- /dev/null
+++ b/test-suite/node-imports.js
@@ -0,0 +1,10 @@
+import fetch from "node-fetch";
+import { WebSocket } from "ws";
+import chai from "chai";
+import chaiString from "chai-string";
+
+chai.use(chaiString);
+
+globalThis.fetch = fetch;
+globalThis.WebSocket = WebSocket;
+globalThis.chai = chai;
diff --git a/test-suite/package-lock.json b/test-suite/package-lock.json
new file mode 100644
index 0000000..c71d1da
--- /dev/null
+++ b/test-suite/package-lock.json
@@ -0,0 +1,1936 @@
+{
+ "name": "engine.io-protocol-test-suite",
+ "version": "0.0.1",
+ "lockfileVersion": 2,
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+ }
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+ "dev": true,
+ "requires": {
+ "camelcase": "^6.0.0",
+ "decamelize": "^4.0.0",
+ "flat": "^5.0.2",
+ "is-plain-obj": "^2.1.0"
+ }
+ },
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+ "version": "0.1.0",
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+ "dev": true
+ }
+ }
+}
diff --git a/test-suite/package.json b/test-suite/package.json
new file mode 100644
index 0000000..0f46351
--- /dev/null
+++ b/test-suite/package.json
@@ -0,0 +1,18 @@
+{
+ "name": "engine.io-protocol-test-suite",
+ "version": "0.0.1",
+ "private": true,
+ "type": "module",
+ "scripts": {
+ "format": "prettier -w *.js",
+ "test": "mocha test-suite.js"
+ },
+ "devDependencies": {
+ "chai": "^4.3.6",
+ "chai-string": "^1.5.0",
+ "mocha": "^9.2.1",
+ "node-fetch": "^3.2.0",
+ "prettier": "^2.5.1",
+ "ws": "^8.5.0"
+ }
+}
diff --git a/test-suite/test-suite.js b/test-suite/test-suite.js
new file mode 100644
index 0000000..447d432
--- /dev/null
+++ b/test-suite/test-suite.js
@@ -0,0 +1,595 @@
+const isNodejs = typeof window === "undefined";
+
+if (isNodejs) {
+ // make the tests runnable in both the browser and Node.js
+ await import("./node-imports.js");
+}
+
+const { expect } = chai;
+
+const URL = "http://localhost:3000";
+const WS_URL = URL.replace("http", "ws");
+
+const PING_INTERVAL = 300;
+const PING_TIMEOUT = 200;
+
+function sleep(delay) {
+ return new Promise((resolve) => setTimeout(resolve, delay));
+}
+
+function waitFor(socket, eventType) {
+ return new Promise((resolve) => {
+ socket.addEventListener(
+ eventType,
+ (event) => {
+ resolve(event);
+ },
+ { once: true }
+ );
+ });
+}
+
+function decodePayload(payload) {
+ const firstColonIndex = payload.indexOf(":");
+ const length = payload.substring(0, firstColonIndex);
+ const packet = payload.substring(firstColonIndex + 1);
+ return [length, packet];
+}
+
+async function initLongPollingSession(supportsBinary = false) {
+ const response = await fetch(`${URL}/engine.io/?EIO=3&transport=polling` + (supportsBinary ? "" : "&b64=1"));
+ const text = await response.text();
+ const [, content] = decodePayload(text);
+ return JSON.parse(content.substring(1)).sid;
+}
+
+describe("Engine.IO protocol", () => {
+ describe("handshake", () => {
+ describe("HTTP long-polling", () => {
+ it("successfully opens a session", async () => {
+ const response = await fetch(
+ `${URL}/engine.io/?EIO=3&transport=polling`
+ );
+
+ expect(response.status).to.eql(200);
+
+ const text = await response.text();
+ const [length, content] = decodePayload(text);
+
+ expect(length).to.eql(content.length.toString());
+ expect(content).to.startsWith("0");
+
+ const value = JSON.parse(content.substring(1));
+
+ expect(value.sid).to.be.a("string");
+ expect(value.upgrades).to.eql(["websocket"]);
+ expect(value.pingInterval).to.eql(PING_INTERVAL);
+ expect(value.pingTimeout).to.eql(PING_TIMEOUT);
+ expect(value.maxPayload).to.be.oneOf([undefined, 1000000]);
+ });
+
+ it("fails with an invalid 'transport' query parameter", async () => {
+ const response = await fetch(`${URL}/engine.io/?EIO=3`);
+
+ expect(response.status).to.eql(400);
+
+ const response2 = await fetch(`${URL}/engine.io/?EIO=3&transport=abc`);
+
+ expect(response2.status).to.eql(400);
+ });
+
+ it("fails with an invalid request method", async () => {
+ const response = await fetch(
+ `${URL}/engine.io/?EIO=3&transport=polling`,
+ {
+ method: "post",
+ }
+ );
+
+ expect(response.status).to.eql(400);
+ });
+ });
+
+ describe("WebSocket", () => {
+ it("successfully opens a session", async () => {
+ const socket = new WebSocket(
+ `${WS_URL}/engine.io/?EIO=3&transport=websocket`
+ );
+
+ const { data } = await waitFor(socket, "message");
+
+ expect(data).to.startsWith("0");
+
+ const value = JSON.parse(data.substring(1));
+
+ expect(value.sid).to.be.a("string");
+ expect(value.upgrades).to.eql([]);
+ expect(value.pingInterval).to.eql(PING_INTERVAL);
+ expect(value.pingTimeout).to.eql(PING_TIMEOUT);
+ expect(value.maxPayload).to.be.oneOf([undefined, 1000000]);
+
+ socket.close();
+ });
+
+ it("fails with an invalid 'EIO' query parameter", async () => {
+ const socket = new WebSocket(
+ `${WS_URL}/engine.io/?transport=websocket`
+ );
+
+ if (isNodejs) {
+ socket.on("error", () => {});
+ }
+
+ waitFor(socket, "close");
+
+ const socket2 = new WebSocket(
+ `${WS_URL}/engine.io/?EIO=abc&transport=websocket`
+ );
+
+ if (isNodejs) {
+ socket2.on("error", () => {});
+ }
+
+ waitFor(socket2, "close");
+ });
+
+ it("fails with an invalid 'transport' query parameter", async () => {
+ const socket = new WebSocket(`${WS_URL}/engine.io/?EIO=3`);
+
+ if (isNodejs) {
+ socket.on("error", () => {});
+ }
+
+ waitFor(socket, "close");
+
+ const socket2 = new WebSocket(
+ `${WS_URL}/engine.io/?EIO=3&transport=abc`
+ );
+
+ if (isNodejs) {
+ socket2.on("error", () => {});
+ }
+
+ waitFor(socket2, "close");
+ });
+ });
+ });
+
+ describe("message", () => {
+ describe("HTTP long-polling", () => {
+ it("sends and receives a payload containing one plain text packet", async () => {
+ const sid = await initLongPollingSession();
+
+ const pushResponse = await fetch(
+ `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`,
+ {
+ method: "post",
+ body: "6:4hello",
+ }
+ );
+
+ expect(pushResponse.status).to.eql(200);
+
+ const postContent = await pushResponse.text();
+
+ expect(postContent).to.eql("ok");
+
+ const pollResponse = await fetch(
+ `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`
+ );
+
+ expect(pollResponse.status).to.eql(200);
+
+ const pollContent = await pollResponse.text();
+
+ expect(pollContent).to.eql("6:4hello");
+ });
+
+ it("sends and receives a payload containing several plain text packets", async () => {
+ const sid = await initLongPollingSession();
+
+ const pushResponse = await fetch(
+ `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`,
+ {
+ method: "post",
+ body: "6:4test16:4test26:4test3",
+ }
+ );
+
+ expect(pushResponse.status).to.eql(200);
+
+ const postContent = await pushResponse.text();
+
+ expect(postContent).to.eql("ok");
+
+ const pollResponse = await fetch(
+ `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`
+ );
+
+ expect(pollResponse.status).to.eql(200);
+
+ const pollContent = await pollResponse.text();
+
+ expect(pollContent).to.eql("6:4test16:4test26:4test3");
+ });
+
+ it("sends and receives a payload containing plain text and binary packets (base64 encoded)", async () => {
+ const sid = await initLongPollingSession();
+
+ const pushResponse = await fetch(
+ `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`,
+ {
+ method: "post",
+ body: "6:4hello10:b4AQIDBA==",
+ }
+ );
+
+ expect(pushResponse.status).to.eql(200);
+
+ const postContent = await pushResponse.text();
+
+ expect(postContent).to.eql("ok");
+
+ const pollResponse = await fetch(
+ `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`
+ );
+
+ expect(pollResponse.status).to.eql(200);
+
+ const pollContent = await pollResponse.text();
+
+ expect(pollContent).to.eql("6:4hello10:b4AQIDBA==");
+ });
+
+ it("sends and receives a payload containing plain text and binary packets (binary)", async () => {
+ const sid = await initLongPollingSession(true);
+
+ const pushResponse = await fetch(
+ `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`,
+ {
+ method: "post",
+ body: "6:4hello10:b4AQIDBA==",
+ }
+ );
+
+ expect(pushResponse.status).to.eql(200);
+
+ const postContent = await pushResponse.text();
+
+ expect(postContent).to.eql("ok");
+
+ const pollResponse = await fetch(
+ `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`
+ );
+
+ expect(pollResponse.status).to.eql(200);
+
+ const buffer = await pollResponse.arrayBuffer();
+
+ // 0 => string
+ // 6 => byte length
+ // 255 => delimiter
+ // 52 => 4 (MESSAGE packet type)
+ // 104 101 108 108 111 => "hello"
+ // 1 => binary
+ // 5 => byte length
+ // 255 => delimiter
+ // 4 => 4 (MESSAGE packet type)
+ // 1 2 3 4 => binary message
+ expect(buffer).to.eql(Uint8Array.from([0, 6, 255, 52, 104, 101, 108, 108, 111, 1, 5, 255, 4, 1, 2, 3, 4]).buffer);
+ });
+
+ it("closes the session upon invalid packet format", async () => {
+ const sid = await initLongPollingSession();
+
+ try {
+ const pushResponse = await fetch(
+ `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`,
+ {
+ method: "post",
+ body: "abc",
+ }
+ );
+
+ expect(pushResponse.status).to.eql(400);
+ } catch (e) {
+ // node-fetch throws when the request is closed abnormally
+ }
+
+ const pollResponse = await fetch(
+ `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`
+ );
+
+ expect(pollResponse.status).to.eql(400);
+ });
+
+ // FIXME CORS error
+ it.skip("closes the session upon duplicate poll requests", async () => {
+ const sid = await initLongPollingSession();
+
+ const pollResponses = await Promise.all([
+ fetch(`${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`),
+ sleep(5).then(() => fetch(`${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}&t=burst`)),
+ ]);
+
+ expect(pollResponses[0].status).to.eql(200);
+
+ const content = await pollResponses[0].text();
+
+ expect(content).to.eql("1:1");
+
+ // the Node.js implementation uses HTTP 500 (Internal Server Error), but HTTP 400 seems more suitable
+ expect(pollResponses[1].status).to.be.oneOf([400, 500]);
+
+ const pollResponse = await fetch(
+ `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`
+ );
+
+ expect(pollResponse.status).to.eql(500);
+ });
+ });
+
+ describe("WebSocket", () => {
+ it("sends and receives a plain text packet", async () => {
+ const socket = new WebSocket(
+ `${WS_URL}/engine.io/?EIO=3&transport=websocket`
+ );
+
+ await waitFor(socket, "open");
+
+ await waitFor(socket, "message"); // handshake
+
+ socket.send("4hello");
+
+ const { data } = await waitFor(socket, "message");
+
+ expect(data).to.eql("4hello");
+
+ socket.close();
+ });
+
+ it("sends and receives a binary packet", async () => {
+ const socket = new WebSocket(
+ `${WS_URL}/engine.io/?EIO=3&transport=websocket`
+ );
+ socket.binaryType = "arraybuffer";
+
+ await waitFor(socket, "message"); // handshake
+
+ socket.send(Uint8Array.from([4, 1, 2, 3, 4]));
+
+ const { data } = await waitFor(socket, "message");
+
+ expect(data).to.eql(Uint8Array.from([4, 1, 2, 3, 4]).buffer);
+
+ socket.close();
+ });
+
+ it("closes the session upon invalid packet format", async () => {
+ const socket = new WebSocket(
+ `${WS_URL}/engine.io/?EIO=3&transport=websocket`
+ );
+
+ await waitFor(socket, "message"); // handshake
+
+ socket.send("abc");
+
+ await waitFor(socket, "close");
+
+ socket.close();
+ });
+ });
+ });
+
+ describe("heartbeat", function () {
+ this.timeout(5000);
+
+ describe("HTTP long-polling", () => {
+ it("sends ping/pong packets", async () => {
+ const sid = await initLongPollingSession();
+
+ for (let i = 0; i < 3; i++) {
+ const pushResponse = await fetch(
+ `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`,
+ {
+ method: "post",
+ body: "1:2",
+ }
+ );
+
+ expect(pushResponse.status).to.eql(200);
+
+ const pollResponse = await fetch(
+ `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`
+ );
+
+ expect(pollResponse.status).to.eql(200);
+
+ const pollContent = await pollResponse.text();
+
+ expect(pollContent).to.eql("1:3");
+ }
+ });
+
+ it("closes the session upon ping timeout", async () => {
+ const sid = await initLongPollingSession();
+
+ await sleep(PING_INTERVAL + PING_TIMEOUT);
+
+ const pushResponse = await fetch(
+ `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`,
+ {
+ method: "post",
+ body: "1:2",
+ }
+ );
+
+ expect(pushResponse.status).to.eql(400);
+ });
+ });
+
+ describe("WebSocket", () => {
+ it("sends ping/pong packets", async () => {
+ const socket = new WebSocket(
+ `${WS_URL}/engine.io/?EIO=3&transport=websocket`
+ );
+
+ const x = await waitFor(socket, "message"); // handshake
+
+ for (let i = 0; i < 3; i++) {
+ socket.send("2");
+
+ const { data } = await waitFor(socket, "message");
+
+ expect(data).to.eql("3");
+ }
+
+ socket.close();
+ });
+
+ it("closes the session upon ping timeout", async () => {
+ const socket = new WebSocket(
+ `${WS_URL}/engine.io/?EIO=3&transport=websocket`
+ );
+
+ await waitFor(socket, "close"); // handshake
+ });
+ });
+ });
+
+ describe("close", () => {
+ describe("HTTP long-polling", () => {
+ it("forcefully closes the session", async () => {
+ const sid = await initLongPollingSession();
+
+ const [pollResponse] = await Promise.all([
+ fetch(`${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`),
+ fetch(`${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`, {
+ method: "post",
+ body: "1:1",
+ }),
+ ]);
+
+ expect(pollResponse.status).to.eql(200);
+
+ const pullContent = await pollResponse.text();
+
+ expect(pullContent).to.eql("1:6");
+
+ const pollResponse2 = await fetch(
+ `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`
+ );
+
+ expect(pollResponse2.status).to.eql(400);
+ });
+ });
+
+ describe("WebSocket", () => {
+ it("forcefully closes the session", async () => {
+ const socket = new WebSocket(
+ `${WS_URL}/engine.io/?EIO=3&transport=websocket`
+ );
+
+ await waitFor(socket, "message"); // handshake
+
+ socket.send("1");
+
+ await waitFor(socket, "close");
+ });
+ });
+ });
+
+ describe("upgrade", () => {
+ it("successfully upgrades from HTTP long-polling to WebSocket", async () => {
+ const sid = await initLongPollingSession();
+
+ const socket = new WebSocket(
+ `${WS_URL}/engine.io/?EIO=3&transport=websocket&sid=${sid}`
+ );
+
+ await waitFor(socket, "open");
+
+ // send probe
+ socket.send("2probe");
+
+ const probeResponse = await waitFor(socket, "message");
+
+ expect(probeResponse.data).to.eql("3probe");
+
+ const pollResponse = await fetch(
+ `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`
+ );
+
+ expect(pollResponse.status).to.eql(200);
+
+ const pollContent = await pollResponse.text();
+
+ expect(pollContent).to.eql("1:6"); // "noop" packet to cleanly end the HTTP long-polling request
+
+ // complete upgrade
+ socket.send("5");
+
+ socket.send("4hello");
+
+ const { data } = await waitFor(socket, "message");
+
+ expect(data).to.eql("4hello");
+ });
+
+ it("ignores HTTP requests with same sid after upgrade", async () => {
+ const sid = await initLongPollingSession();
+
+ const socket = new WebSocket(
+ `${WS_URL}/engine.io/?EIO=3&transport=websocket&sid=${sid}`
+ );
+
+ await waitFor(socket, "open");
+
+ socket.send("2probe");
+ const res = await waitFor(socket, "message");
+ expect(res.data).to.eql("3probe");
+
+ socket.send("5");
+
+ const pollResponse = await fetch(
+ `${URL}/engine.io/?EIO=3&transport=polling&sid=${sid}`
+ );
+
+ expect(pollResponse.status).to.eql(400);
+
+ socket.send("4hello");
+
+ const { data } = await waitFor(socket, "message");
+
+ expect(data).to.eql("4hello");
+ });
+
+ it("ignores WebSocket connection with same sid after upgrade", async () => {
+ const sid = await initLongPollingSession();
+
+ const socket = new WebSocket(
+ `${WS_URL}/engine.io/?EIO=3&transport=websocket&sid=${sid}`
+ );
+
+ await waitFor(socket, "open");
+
+ socket.send("2probe");
+ const res = await waitFor(socket, "message");
+ expect(res.data).to.eql("3probe");
+
+ socket.send("5");
+
+ const socket2 = new WebSocket(
+ `${WS_URL}/engine.io/?EIO=3&transport=websocket&sid=${sid}`
+ );
+
+ await waitFor(socket2, "close");
+
+ socket.send("4hello");
+
+ const { data } = await waitFor(socket, "message");
+
+ expect(data).to.eql("4hello");
+ });
+ });
+});