feat(server): Use Bun

.github/workflows/benchmark.yml

@@ -120,3 +120,29 @@ jobs:
         run: |
           NODE_ENV=production node benchmark/servers/legacy_ws7.mjs &
           LEGACY=1 SERVER=legacy_ws7 ./k6 run benchmark/k6.mjs
+  bun:
+    name: bun
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Set up node
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18
+          cache: yarn
+      - name: Install
+        run: yarn install --immutable
+      - name: Download k6
+        run: |
+          curl https://github.com/grafana/k6/releases/download/v0.39.0/k6-v0.39.0-linux-amd64.tar.gz -L | tar xvz --strip-components 1
+      - name: Build
+        run: yarn run build:esm
+      - name: Set up bun
+        uses: oven-sh/setup-bun@v1
+        with:
+          bun-version: latest
+      - name: Run
+        run: |
+          bun benchmark/servers/bun.ts &
+          SERVER=bun ./k6 run benchmark/k6.mjs

benchmark/servers/bun.ts

@@ -0,0 +1,18 @@
+/// <reference types="bun-types" />
+
+import { schema } from './schema.mjs';
+import { makeHandler } from '../../src/use/bun';
+import { ports } from './ports.mjs';
+
+Bun.serve({
+  fetch(req, server) {
+    if (server.upgrade(req)) {
+      return new Response();
+    }
+    return new Response(null, { status: 500 });
+  },
+  websocket: makeHandler({ schema }),
+  port: ports.bun,
+});
+
+console.log(`bun - listening on port ${ports.bun}...`);

benchmark/servers/ports.mjs

@@ -4,4 +4,5 @@ export const ports = {
   uWebSockets: 6541,
   legacy_ws7: 6542,
   '@fastify/websocket': 6544,
+  bun: 6545,
 };

package.json

@@ -59,6 +59,12 @@
       "require": "./lib/use/fastify-websocket.js",
       "import": "./lib/use/fastify-websocket.mjs"
     },
+    "./lib/use/bun": {
+      "bun": "./lib/use/bun.mjs",
+      "types": "./lib/use/bun.d.ts",
+      "require": "./lib/use/bun.js",
+      "import": "./lib/use/bun.mjs"
+    },
     "./package.json": "./package.json"
   },
   "files": [
@@ -115,6 +121,7 @@
     "@typescript-eslint/eslint-plugin": "^5.59.5",
     "@typescript-eslint/parser": "^5.59.5",
     "babel-jest": "^29.5.0",
+    "bun-types": "^0.5.8",
     "eslint": "^8.40.0",
     "eslint-config-prettier": "^8.8.0",
     "fastify": "^4.17.0",

scripts/post-gendocs.mjs

@@ -29,12 +29,7 @@ async function fixLinksInDir(dirPath) {
     }
     const contents = await fsp.readFile(filePath);
     const src = contents.toString();
-    await fsp.writeFile(
-      filePath,
-      src
-        // @ts-expect-error we're running this on modern node
-        .replaceAll('.md', ''),
-    );
+    await fsp.writeFile(filePath, src.replaceAll('.md', ''));
   }
 }
 
@@ -70,9 +65,7 @@ async function createRecursiveMetaFiles(dirPath) {
     if (nameNoExt === 'use__fastify_websocket') {
       meta[nameNoExt] = 'use/@fastify/websocket';
     } else {
-      meta[nameNoExt] = nameNoExt
-        // @ts-expect-error we're running this on modern node
-        .replaceAll('_', '/');
+      meta[nameNoExt] = nameNoExt.replaceAll('_', '/');
     }
   }
 

src/use/bun.ts

@@ -0,0 +1,92 @@
+/// <reference types="bun-types" />
+
+import type { WebSocketHandler, ServerWebSocket } from 'bun';
+import {
+  ConnectionInitMessage,
+  GRAPHQL_TRANSPORT_WS_PROTOCOL,
+} from '../common';
+import { makeServer, ServerOptions } from '../server';
+
+/**
+ * Convenience export for checking the WebSocket protocol on the request in `Bun.serve`.
+ */
+export { handleProtocols } from '../server';
+
+/**
+ * The extra that will be put in the `Context`.
+ *
+ * @category Server/bun
+ */
+export interface Extra {
+  /**
+   * The actual socket connection between the server and the client.
+   */
+  readonly socket: ServerWebSocket;
+}
+
+/**
+ * Use the server with [Bun](https://bun.sh/).
+ * This is a basic starter, feel free to copy the code over and adjust it to your needs
+ *
+ * The keep-alive logic _seems_ to be handled by Bun seeing that
+ * they default [`sendPingsAutomatically` to `true`](https://github.com/oven-sh/bun/blob/6a163cf933542506354dc836bd92693bcae5939b/src/deps/uws.zig#L893).
+ *
+ * @category Server/bun
+ */
+export function makeHandler<
+  P extends ConnectionInitMessage['payload'] = ConnectionInitMessage['payload'],
+  E extends Record<PropertyKey, unknown> = Record<PropertyKey, never>,
+>(options: ServerOptions<P, Extra & Partial<E>>): WebSocketHandler {
+  const server = makeServer(options);
+
+  interface Client {
+    handleMessage: (data: string) => Promise<void>;
+    closed: (code: number, reason: string) => Promise<void>;
+  }
+  const clients = new WeakMap<ServerWebSocket, Client>();
+
+  return {
+    open(ws) {
+      const client: Client = {
+        handleMessage: () => {
+          throw new Error('Message received before handler was registered');
+        },
+        closed: () => {
+          throw new Error('Closed before handler was registered');
+        },
+      };
+
+      client.closed = server.opened(
+        {
+          // TODO: use protocol on socket once Bun exposes it
+          protocol: GRAPHQL_TRANSPORT_WS_PROTOCOL,
+          send: async (message) => {
+            // ws might have been destroyed in the meantime, send only if exists
+            if (clients.has(ws)) {
+              ws.sendText(message);
+            }
+          },
+          close: (code, reason) => {
+            if (clients.has(ws)) {
+              ws.close(code, reason);
+            }
+          },
+          onMessage: (cb) => (client.handleMessage = cb),
+        },
+        { socket: ws } as Extra & Partial<E>,
+      );
+
+      clients.set(ws, client);
+    },
+    message(ws, message) {
+      const client = clients.get(ws);
+      if (!client) throw new Error('Message received for a missing client');
+      return client.handleMessage(String(message));
+    },
+    close(ws, code, message) {
+      const client = clients.get(ws);
+      if (!client) throw new Error('Closing a missing client');
+      return client.closed(code, message);
+    },
+  };
+}

website/src/pages/get-started.mdx

@@ -113,6 +113,34 @@ fastify.listen(4000, (err) => {
 });
 ```
 
+#### With [Bun](https://bun.sh)
+
+```ts
+import { makeHandler, handleProtocols } from 'graphql-ws/lib/use/lib/bun';
+import { schema } from './previous-step';
+
+Bun.serve({
+  fetch(req, server) {
+    const [path, _search] = req.url.split('?');
+    if (
+      path.endsWith('/graphql') &&
+      handleProtocols(req.headers.get('sec-websocket-protocol') || '')
+    ) {
+      if (server.upgrade(req)) {
+        return new Response();
+      } else {
+        return new Response('Internal Server Error', { status: 500 });
+      }
+    }
+    return new Response('Upgrade Required', { status: 426 });
+  },
+  websocket: makeHandler({ schema }),
+  port: 4000,
+});
+
+console.log('Listening to port 4000');
+```
+
 ### Use the client
 
 ```ts

yarn.lock

@@ -4415,6 +4415,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"bun-types@npm:^0.5.8":
+  version: 0.5.8
+  resolution: "bun-types@npm:0.5.8"
+  checksum: 8a4a7652b1b877381549195f1fa8d23c7f62f60f39af58b5ca060946576ed4fb728e9f249518e68a0c678a1953b85fe509b50956d7fefe5fcece5abcc6ee6a94
+  languageName: node
+  linkType: hard
+
 "busboy@npm:1.6.0":
   version: 1.6.0
   resolution: "busboy@npm:1.6.0"
@@ -7064,6 +7071,7 @@ __metadata:
     "@typescript-eslint/eslint-plugin": ^5.59.5
     "@typescript-eslint/parser": ^5.59.5
     babel-jest: ^29.5.0
+    bun-types: ^0.5.8
     eslint: ^8.40.0
     eslint-config-prettier: ^8.8.0
     fastify: ^4.17.0