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84 lines
3.2 KiB
84 lines
3.2 KiB
4 months ago
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import { makeServer } from '../server.mjs';
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import { DEPRECATED_GRAPHQL_WS_PROTOCOL, CloseCode, } from '../common.mjs';
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export { GRAPHQL_TRANSPORT_WS_PROTOCOL } from '../common.mjs';
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/**
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* Use the server with [Deno](https://deno.com/).
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* This is a basic starter, feel free to copy the code over and adjust it to your needs.
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*
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* The keep-alive is set in `Deno.upgradeWebSocket` during the upgrade.
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*
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* Additionally, the required WebSocket protocol is also defined during the upgrade,
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* the correct example being:
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*
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* ```ts
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* import { serve } from 'https://deno.land/std/http/mod.ts';
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* import {
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* makeHandler,
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* GRAPHQL_TRANSPORT_WS_PROTOCOL,
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* } from 'https://esm.sh/graphql-ws/lib/use/deno';
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* import { schema } from './my-schema.ts/index.mjs';
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*
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* const handler = makeHandler({ schema });
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*
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* serve(
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* (req: Request) => {
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* const [path, _search] = req.url.split('?');
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* if (!path.endsWith('/graphql')) {
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* return new Response('Not Found', { status: 404 });
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* }
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* if (req.headers.get('upgrade') != 'websocket') {
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* return new Response('Upgrade Required', { status: 426 });
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* }
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* const { socket, response } = Deno.upgradeWebSocket(req, {
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* protocol: GRAPHQL_TRANSPORT_WS_PROTOCOL,
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* idleTimeout: 12_000,
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* });
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* handler(socket);
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* return response;
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* },
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* { port: 4000 },
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* );
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* ```
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*
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* @category Server/deno
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*/
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export function makeHandler(options) {
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const server = makeServer(options);
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return function handle(socket) {
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socket.onerror = (err) => {
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console.error('Internal error emitted on the WebSocket socket. ' +
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'Please check your implementation.', err);
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socket.close(CloseCode.InternalServerError, 'Internal server error');
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};
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let closed = () => {
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// noop
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};
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socket.onopen = () => {
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closed = server.opened({
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protocol: socket.protocol,
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send: (msg) => socket.send(msg),
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close: (code, reason) => socket.close(code, reason),
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onMessage: (cb) => {
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socket.onmessage = async (event) => {
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try {
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await cb(String(event.data));
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}
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catch (err) {
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console.error('Internal error occurred during message handling. ' +
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'Please check your implementation.', err);
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socket.close(CloseCode.InternalServerError, 'Internal server error');
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}
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};
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},
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}, { socket });
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};
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socket.onclose = (event) => {
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if (event.code === CloseCode.SubprotocolNotAcceptable &&
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socket.protocol === DEPRECATED_GRAPHQL_WS_PROTOCOL)
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console.warn(`Client provided the unsupported and deprecated subprotocol "${socket.protocol}" used by subscriptions-transport-ws.` +
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'Please see https://www.apollographql.com/docs/apollo-server/data/subscriptions/#switching-from-subscriptions-transport-ws.');
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closed(event.code, event.reason);
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};
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};
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}
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