| 1 | import {use, Suspense, useState, startTransition, Profiler} from 'react'; |
| 2 | import ReactDOM from 'react-dom/client'; |
| 3 | import {createFromFetch, encodeReply} from 'react-server-dom-webpack/client'; |
| 4 | |
| 5 | // TODO: This should be a dependency of the App but we haven't implemented CSS in Node yet. |
| 6 | import './style.css'; |
| 7 | |
| 8 | function findSourceMapURL(fileName) { |
| 9 | return ( |
| 10 | document.location.origin + |
| 11 | '/source-maps?name=' + |
| 12 | encodeURIComponent(fileName) |
| 13 | ); |
| 14 | } |
| 15 | |
| 16 | async function createWebSocketStream(url) { |
| 17 | const ws = new WebSocket(url); |
| 18 | ws.binaryType = 'arraybuffer'; |
| 19 | |
| 20 | await new Promise((resolve, reject) => { |
| 21 | ws.addEventListener('open', resolve, {once: true}); |
| 22 | ws.addEventListener('error', reject, {once: true}); |
| 23 | }); |
| 24 | |
| 25 | const writable = new WritableStream({ |
| 26 | write(chunk) { |
| 27 | ws.send(chunk); |
| 28 | }, |
| 29 | close() { |
| 30 | ws.close(); |
| 31 | }, |
| 32 | abort(reason) { |
| 33 | ws.close(1000, reason && String(reason)); |
| 34 | }, |
| 35 | }); |
| 36 | |
| 37 | const readable = new ReadableStream({ |
| 38 | start(controller) { |
| 39 | ws.addEventListener('message', event => { |
| 40 | controller.enqueue(event.data); |
| 41 | }); |
| 42 | ws.addEventListener('close', () => { |
| 43 | controller.close(); |
| 44 | }); |
| 45 | ws.addEventListener('error', err => { |
| 46 | controller.error(err); |
| 47 | }); |
| 48 | }, |
| 49 | }); |
| 50 | |
| 51 | return {readable, writable}; |
| 52 | } |
| 53 | |
| 54 | let updateRoot; |
| 55 | async function callServer(id, args) { |
| 56 | let response; |
| 57 | if (process.env.NODE_ENV === 'development') { |
| 58 | const requestId = crypto.randomUUID(); |
| 59 | const debugChannel = await createWebSocketStream( |
| 60 | `ws://localhost:3001/debug-channel?id=${requestId}` |
| 61 | ); |
| 62 | response = createFromFetch( |
| 63 | fetch('/', { |
| 64 | method: 'POST', |
| 65 | headers: { |
| 66 | Accept: 'text/x-component', |
| 67 | 'rsc-action': id, |
| 68 | 'rsc-request-id': requestId, |
| 69 | }, |
| 70 | body: await encodeReply(args), |
| 71 | }), |
| 72 | { |
| 73 | callServer, |
| 74 | debugChannel, |
| 75 | findSourceMapURL, |
| 76 | } |
| 77 | ); |
| 78 | } else { |
| 79 | response = createFromFetch( |
| 80 | fetch('/', { |
| 81 | method: 'POST', |
| 82 | headers: { |
| 83 | Accept: 'text/x-component', |
| 84 | 'rsc-action': id, |
| 85 | }, |
| 86 | body: await encodeReply(args), |
| 87 | }), |
| 88 | { |
| 89 | callServer, |
| 90 | findSourceMapURL, |
| 91 | } |
| 92 | ); |
| 93 | } |
| 94 | const {returnValue, root} = await response; |
| 95 | // Refresh the tree with the new RSC payload. |
| 96 | startTransition(() => { |
| 97 | updateRoot(root); |
| 98 | }); |
| 99 | return returnValue; |
| 100 | } |
| 101 | |
| 102 | function Shell({data}) { |
| 103 | const [root, setRoot] = useState(data); |
| 104 | updateRoot = setRoot; |
| 105 | return root; |
| 106 | } |
| 107 | |
| 108 | async function hydrateApp() { |
| 109 | let response; |
| 110 | if (process.env.NODE_ENV === 'development') { |
| 111 | const requestId = crypto.randomUUID(); |
| 112 | const debugChannel = await createWebSocketStream( |
| 113 | `ws://localhost:3001/debug-channel?id=${requestId}` |
| 114 | ); |
| 115 | response = createFromFetch( |
| 116 | fetch('/', { |
| 117 | headers: { |
| 118 | Accept: 'text/x-component', |
| 119 | 'rsc-request-id': requestId, |
| 120 | }, |
| 121 | }), |
| 122 | { |
| 123 | callServer, |
| 124 | debugChannel, |
| 125 | findSourceMapURL, |
| 126 | } |
| 127 | ); |
| 128 | } else { |
| 129 | response = createFromFetch( |
| 130 | fetch('/', { |
| 131 | headers: { |
| 132 | Accept: 'text/x-component', |
| 133 | }, |
| 134 | }), |
| 135 | { |
| 136 | callServer, |
| 137 | findSourceMapURL, |
| 138 | } |
| 139 | ); |
| 140 | } |
| 141 | const {root, returnValue, formState} = await response; |
| 142 | |
| 143 | ReactDOM.hydrateRoot( |
| 144 | document, |
| 145 | <Profiler id="root"> |
| 146 | <Shell data={root} /> |
| 147 | </Profiler>, |
| 148 | { |
| 149 | // TODO: This part doesn't actually work because the server only returns |
| 150 | // form state during the request that submitted the form. Which means it |
| 151 | // the state needs to be transported as part of the HTML stream. We intend |
| 152 | // to add a feature to Fizz for this, but for now it's up to the |
| 153 | // metaframework to implement correctly. |
| 154 | formState: formState, |
| 155 | } |
| 156 | ); |
| 157 | } |
| 158 | |
| 159 | // Remove this line to simulate MPA behavior |
| 160 | hydrateApp(); |