enisdenjo/graphiql-over-sse.html

## graphiql-over-sse.html
<!--
 *  Copyright (c) 2021 GraphQL Contributors
 *  All rights reserved.
 *
 *  This code is licensed under the MIT license.
 *  Use it however you wish.
-->
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />

    <style>
      body {
        height: 100%;
        margin: 0;
        width: 100%;
        overflow: hidden;
      }

      #graphiql {
        height: 100vh;
      }
    </style>

    <!--
      This GraphiQL example depends on Promise and AsyncIterator, which are available in
      modern browsers, but can be "polyfilled" for older browsers.
      GraphiQL itself depends on React DOM.
      If you do not want to rely on a CDN, you can host these files locally or
      include them directly in your favored resource bunder.
    -->
    <script
      crossorigin
      src="https://unpkg.com/react@16/umd/react.development.js"
    ></script>
    <script
      crossorigin
      src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"
    ></script>

    <!--
      These two files can be found in the npm module, however you may wish to
      copy them directly into your environment, or perhaps include them in your
      favored resource bundler.
     -->
    <link rel="stylesheet" href="https://unpkg.com/graphiql/graphiql.min.css" />
  </head>

  <body>
    <div id="graphiql">Loading...</div>
    <script
      src="https://unpkg.com/graphiql/graphiql.js"
      type="application/javascript"
    ></script>
    <script
      src="https://unpkg.com/graphql-sse/umd/graphql-sse.js"
      type="application/javascript"
    ></script>

    <script>
      const sseClient = graphqlSse.createClient({
        singleConnection: true, // or use false if you have a HTTP/2 server
        url: "http://localhost:4000/graphql/stream",
        retryAttempts: 0,
        lazy: false, // connect as soon as the page opens
      });

      function subscribe(payload) {
        let deferred = null;
        const pending = [];
        let throwMe = null,
          done = false;
        const dispose = sseClient.subscribe(payload, {
          next: (data) => {
            pending.push(data);
            deferred?.resolve(false);
          },
          error: (err) => {
            throwMe = err;
            deferred?.reject(throwMe);
          },
          complete: () => {
            done = true;
            deferred?.resolve(true);
          },
        });
        return {
          [Symbol.asyncIterator]() {
            return this;
          },
          async next() {
            if (done) return { done: true, value: undefined };
            if (throwMe) throw throwMe;
            if (pending.length) return { value: pending.shift() };
            return (await new Promise(
              (resolve, reject) => (deferred = { resolve, reject })
            ))
              ? { done: true, value: undefined }
              : { value: pending.shift() };
          },
          async return() {
            dispose();
            return { done: true, value: undefined };
          },
        };
      }

      ReactDOM.render(
        React.createElement(GraphiQL, {
          fetcher: subscribe,
          defaultVariableEditorOpen: true,
        }),
        document.getElementById("graphiql")
      );
    </script>
  </body>
</html>
	<!--
	* Copyright (c) 2021 GraphQL Contributors
	* All rights reserved.
	*
	* This code is licensed under the MIT license.
	* Use it however you wish.
	-->
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8" />

	<style>
	body {
	height: 100%;
	margin: 0;
	width: 100%;
	overflow: hidden;
	}

	#graphiql {
	height: 100vh;
	}
	</style>

	<!--
	This GraphiQL example depends on Promise and AsyncIterator, which are available in
	modern browsers, but can be "polyfilled" for older browsers.
	GraphiQL itself depends on React DOM.
	If you do not want to rely on a CDN, you can host these files locally or
	include them directly in your favored resource bunder.
	-->
	<script
	crossorigin
	src="https://unpkg.com/react@16/umd/react.development.js"
	></script>
	<script
	crossorigin
	src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"
	></script>

	<!--
	These two files can be found in the npm module, however you may wish to
	copy them directly into your environment, or perhaps include them in your
	favored resource bundler.
	-->
	<link rel="stylesheet" href="https://unpkg.com/graphiql/graphiql.min.css" />
	</head>

	<body>
	<div id="graphiql">Loading...</div>
	<script
	src="https://unpkg.com/graphiql/graphiql.js"
	type="application/javascript"
	></script>
	<script
	src="https://unpkg.com/graphql-sse/umd/graphql-sse.js"
	type="application/javascript"
	></script>

	<script>
	const sseClient = graphqlSse.createClient({
	singleConnection: true, // or use false if you have a HTTP/2 server
	url: "http://localhost:4000/graphql/stream",
	retryAttempts: 0,
	lazy: false, // connect as soon as the page opens
	});

	function subscribe(payload) {
	let deferred = null;
	const pending = [];
	let throwMe = null,
	done = false;
	const dispose = sseClient.subscribe(payload, {
	next: (data) => {
	pending.push(data);
	deferred?.resolve(false);
	},
	error: (err) => {
	throwMe = err;
	deferred?.reject(throwMe);
	},
	complete: () => {
	done = true;
	deferred?.resolve(true);
	},
	});
	return {
	[Symbol.asyncIterator]() {
	return this;
	},
	async next() {
	if (done) return { done: true, value: undefined };
	if (throwMe) throw throwMe;
	if (pending.length) return { value: pending.shift() };
	return (await new Promise(
	(resolve, reject) => (deferred = { resolve, reject })
	))
	? { done: true, value: undefined }
	: { value: pending.shift() };
	},
	async return() {
	dispose();
	return { done: true, value: undefined };
	},
	};
	}

	ReactDOM.render(
	React.createElement(GraphiQL, {
	fetcher: subscribe,
	defaultVariableEditorOpen: true,
	}),
	document.getElementById("graphiql")
	);
	</script>
	</body>
	</html>