Function: makeHandler()

makeHandler<P, E>(options): (socket) => void

Use the server with Deno. This is a basic starter, feel free to copy the code over and adjust it to your needs.

The keep-alive is set in Deno.upgradeWebSocket during the upgrade.

Additionally, the required WebSocket protocol is also defined during the upgrade, the correct example being:

import { serve } from 'https://deno.land/std/http/mod.ts';
import {
  makeHandler,
  GRAPHQL_TRANSPORT_WS_PROTOCOL,
} from 'https://esm.sh/graphql-ws/lib/use/deno';
import { schema } from './my-schema.ts';
 
const handler = makeHandler({ schema });
 
serve(
  (req: Request) => {
    const [path, _search] = req.url.split('?');
    if (!path.endsWith('/graphql')) {
      return new Response('Not Found', { status: 404 });
    }
    if (req.headers.get('upgrade') != 'websocket') {
      return new Response('Upgrade Required', { status: 426 });
    }
    const { socket, response } = Deno.upgradeWebSocket(req, {
      protocol: GRAPHQL_TRANSPORT_WS_PROTOCOL,
      idleTimeout: 12_000,
    });
    handler(socket);
    return response;
  },
  { port: 4000 },
);

Type Parameters

• P extends undefined | Record<string, unknown> = undefined | Record<string, unknown>

• E extends Record<PropertyKey, unknown> = Record<PropertyKey, never>

Parameters

options

ServerOptions<P, Extra & Partial<E>>

Returns

Function

Parameters

socket

WebSocket

Returns

void

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