├── images
    └── main.png
├── public
    ├── favicon.ico
    ├── logo192.png
    ├── logo512.png
    ├── robots.txt
    ├── manifest.json
    └── index.html
├── Dockerfile
├── src
    ├── setupTests.js
    ├── App.js
    ├── App.test.js
    ├── pages
    │   └── MessageListPage.js
    ├── index.css
    ├── protos
    │   ├── chat.proto
    │   ├── chat_pb.js
    │   └── chat_grpc_web_pb.js
    ├── components
    │   └── chat
    │   │   └── MessageList.js
    ├── index.js
    ├── App.css
    ├── containers
    │   └── MessageListContainer.js
    ├── logo.svg
    └── serviceWorker.js
├── package.json
├── server.js
├── envoy.yaml
├── .gitignore
└── README.md


/images/main.png:
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https://raw.githubusercontent.com/parkgeonhu/react-gRPC-chat/HEAD/images/main.png


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/public/favicon.ico:
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https://raw.githubusercontent.com/parkgeonhu/react-gRPC-chat/HEAD/public/favicon.ico


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/public/logo192.png:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/parkgeonhu/react-gRPC-chat/HEAD/public/logo192.png


--------------------------------------------------------------------------------
/public/logo512.png:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/parkgeonhu/react-gRPC-chat/HEAD/public/logo512.png


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/public/robots.txt:
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1 | # https://www.robotstxt.org/robotstxt.html
2 | User-agent: *
3 | Disallow:
4 | 


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/Dockerfile:
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1 | FROM envoyproxy/envoy:v1.12.2
2 | 
3 | COPY ./envoy.yaml /etc/envoy/envoy.yaml
4 | 
5 | CMD /usr/local/bin/envoy -c /etc/envoy/envoy.yaml -l trace --log-path /tmp/envoy_info.log


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/src/setupTests.js:
--------------------------------------------------------------------------------
1 | // jest-dom adds custom jest matchers for asserting on DOM nodes.
2 | // allows you to do things like:
3 | // expect(element).toHaveTextContent(/react/i)
4 | // learn more: https://github.com/testing-library/jest-dom
5 | import '@testing-library/jest-dom/extend-expect';
6 | 


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/src/App.js:
--------------------------------------------------------------------------------
 1 | import React from 'react';
 2 | import logo from './logo.svg';
 3 | import './App.css';
 4 | import PostListPage from './pages/MessageListPage';
 5 | 
 6 | function App() {
 7 |   return (
 8 |     <>
 9 |       <PostListPage />
10 |     </>
11 |   );
12 | }
13 | 
14 | export default App;
15 | 


--------------------------------------------------------------------------------
/src/App.test.js:
--------------------------------------------------------------------------------
 1 | import React from 'react';
 2 | import { render } from '@testing-library/react';
 3 | import App from './App';
 4 | 
 5 | test('renders learn react link', () => {
 6 |   const { getByText } = render(<App />);
 7 |   const linkElement = getByText(/learn react/i);
 8 |   expect(linkElement).toBeInTheDocument();
 9 | });
10 | 


--------------------------------------------------------------------------------
/src/pages/MessageListPage.js:
--------------------------------------------------------------------------------
 1 | import React from 'react';
 2 | import MessageList from '../components/chat/MessageList';
 3 | import MessageListContainer from '../containers/MessageListContainer';
 4 | 
 5 | const PostListPage = () => {
 6 |     return (
 7 |         <>
 8 |             <MessageListContainer />
 9 |         </>
10 |     );
11 | };
12 | 
13 | export default PostListPage;
14 | 


--------------------------------------------------------------------------------
/src/index.css:
--------------------------------------------------------------------------------
 1 | body {
 2 |   margin: 0;
 3 |   font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
 4 |     'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
 5 |     sans-serif;
 6 |   -webkit-font-smoothing: antialiased;
 7 |   -moz-osx-font-smoothing: grayscale;
 8 | }
 9 | 
10 | code {
11 |   font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
12 |     monospace;
13 | }
14 | 


--------------------------------------------------------------------------------
/src/protos/chat.proto:
--------------------------------------------------------------------------------
 1 | syntax = "proto3"; //Specify proto3 version.
 2 |  
 3 | package example; //Optional: unique package name.
 4 |  
 5 | service Chat { //Service class to be used by the clients
 6 |     rpc join(Message) returns (stream Message){}
 7 |     rpc send(Message) returns (Message){}
 8 | }
 9 |  
10 | message Message { //Information that will be passed between client and service
11 |     string user = 1;
12 |     string text = 2;
13 | }


--------------------------------------------------------------------------------
/src/components/chat/MessageList.js:
--------------------------------------------------------------------------------
 1 | import React from 'react';
 2 | 
 3 | const MessageList = ({ chat }) => {
 4 | 
 5 |     return (
 6 |         <div>
 7 |             {chat.map(({ name, msg }, idx) => (
 8 |                 <div key={idx}>
 9 |                     <span style={{ color: "green" }}>{name}: </span>
10 | 
11 |                     <span>{msg}</span>
12 |                 </div>
13 |             ))}
14 |         </div>
15 |     );
16 | };
17 | 
18 | export default MessageList;
19 | 


--------------------------------------------------------------------------------
/src/index.js:
--------------------------------------------------------------------------------
 1 | import React from 'react';
 2 | import ReactDOM from 'react-dom';
 3 | import './index.css';
 4 | import App from './App';
 5 | import * as serviceWorker from './serviceWorker';
 6 | 
 7 | ReactDOM.render(
 8 |   <React.StrictMode>
 9 |     <App />
10 |   </React.StrictMode>,
11 |   document.getElementById('root')
12 | );
13 | 
14 | // If you want your app to work offline and load faster, you can change
15 | // unregister() to register() below. Note this comes with some pitfalls.
16 | // Learn more about service workers: https://bit.ly/CRA-PWA
17 | serviceWorker.unregister();
18 | 


--------------------------------------------------------------------------------
/public/manifest.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "short_name": "React App",
 3 |   "name": "Create React App Sample",
 4 |   "icons": [
 5 |     {
 6 |       "src": "favicon.ico",
 7 |       "sizes": "64x64 32x32 24x24 16x16",
 8 |       "type": "image/x-icon"
 9 |     },
10 |     {
11 |       "src": "logo192.png",
12 |       "type": "image/png",
13 |       "sizes": "192x192"
14 |     },
15 |     {
16 |       "src": "logo512.png",
17 |       "type": "image/png",
18 |       "sizes": "512x512"
19 |     }
20 |   ],
21 |   "start_url": ".",
22 |   "display": "standalone",
23 |   "theme_color": "#000000",
24 |   "background_color": "#ffffff"
25 | }
26 | 


--------------------------------------------------------------------------------
/src/App.css:
--------------------------------------------------------------------------------
 1 | .App {
 2 |   text-align: center;
 3 | }
 4 | 
 5 | .App-logo {
 6 |   height: 40vmin;
 7 |   pointer-events: none;
 8 | }
 9 | 
10 | @media (prefers-reduced-motion: no-preference) {
11 |   .App-logo {
12 |     animation: App-logo-spin infinite 20s linear;
13 |   }
14 | }
15 | 
16 | .App-header {
17 |   background-color: #282c34;
18 |   min-height: 100vh;
19 |   display: flex;
20 |   flex-direction: column;
21 |   align-items: center;
22 |   justify-content: center;
23 |   font-size: calc(10px + 2vmin);
24 |   color: white;
25 | }
26 | 
27 | .App-link {
28 |   color: #61dafb;
29 | }
30 | 
31 | @keyframes App-logo-spin {
32 |   from {
33 |     transform: rotate(0deg);
34 |   }
35 |   to {
36 |     transform: rotate(360deg);
37 |   }
38 | }
39 | 


--------------------------------------------------------------------------------
/package.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "name": "react-grpc-chat",
 3 |   "version": "0.1.0",
 4 |   "private": true,
 5 |   "dependencies": {
 6 |     "@grpc/proto-loader": "^0.5.5",
 7 |     "@testing-library/jest-dom": "^4.2.4",
 8 |     "@testing-library/react": "^9.3.2",
 9 |     "@testing-library/user-event": "^7.1.2",
10 |     "google-protobuf": "^3.12.4",
11 |     "grpc": "^1.24.3",
12 |     "grpc-web": "^1.2.0",
13 |     "protobufjs": "^6.10.1",
14 |     "react": "^16.13.1",
15 |     "react-dom": "^16.13.1",
16 |     "react-scripts": "3.4.1"
17 |   },
18 |   "scripts": {
19 |     "start": "react-scripts start",
20 |     "build": "react-scripts build",
21 |     "test": "react-scripts test",
22 |     "eject": "react-scripts eject"
23 |   },
24 |   "eslintConfig": {
25 |     "extends": "react-app"
26 |   },
27 |   "browserslist": {
28 |     "production": [
29 |       ">0.2%",
30 |       "not dead",
31 |       "not op_mini all"
32 |     ],
33 |     "development": [
34 |       "last 1 chrome version",
35 |       "last 1 firefox version",
36 |       "last 1 safari version"
37 |     ]
38 |   }
39 | }
40 | 


--------------------------------------------------------------------------------
/server.js:
--------------------------------------------------------------------------------
 1 | let grpc = require("grpc");
 2 | var protoLoader = require("@grpc/proto-loader");
 3 |  
 4 | const server = new grpc.Server();
 5 | const SERVER_ADDRESS = "localhost:8080";
 6 |  
 7 | // Load protobuf
 8 | let proto = grpc.loadPackageDefinition(
 9 |   protoLoader.loadSync("src/protos/chat.proto", {
10 |     keepCase: true,
11 |     longs: String,
12 |     enums: String,
13 |     defaults: true,
14 |     oneofs: true
15 |   })
16 | );
17 |  
18 | let users = [];
19 |  
20 | // Receive message from client joining
21 | function join(call, callback) {
22 |   console.log(call)
23 |   users.push(call);
24 |   notifyChat({ user: "Server", text: "new user joined ..." });
25 | }
26 |  
27 | // Receive message from client
28 | function send(call, callback) {
29 |   console.log(call.request);
30 |   
31 |   notifyChat(call.request);
32 |   console.log(callback)
33 |   return callback(null,{text:call.request.text})
34 | }
35 |  
36 | // Send message to all connected clients
37 | function notifyChat(message) {
38 |   users.forEach(user => {
39 |     user.write(message);
40 |   });
41 | }
42 |  
43 | // Define server with the methods and start it
44 | server.addService(proto.example.Chat.service, { join: join, send: send });
45 |  
46 | server.bind(SERVER_ADDRESS, grpc.ServerCredentials.createInsecure());
47 | 
48 | console.log("Start Server!");
49 | 
50 | server.start();


--------------------------------------------------------------------------------
/envoy.yaml:
--------------------------------------------------------------------------------
 1 | admin:
 2 |   access_log_path: /tmp/admin_access.log
 3 |   address:
 4 |     socket_address: { address: 0.0.0.0, port_value: 9901 }
 5 | 
 6 | static_resources:
 7 |   listeners:
 8 |   - name: listener_0
 9 |     address:
10 |       socket_address: { address: 0.0.0.0, port_value: 9090 }
11 |     filter_chains:
12 |     - filters:
13 |       - name: envoy.http_connection_manager
14 |         config:
15 |           codec_type: auto
16 |           stat_prefix: ingress_http
17 |           route_config:
18 |             name: local_route
19 |             virtual_hosts:
20 |             - name: local_service
21 |               domains: ["*"]
22 |               routes:
23 |               - match: { prefix: "/" }
24 |                 route:
25 |                   cluster: ping_pong_service
26 |                   max_grpc_timeout: 0s
27 |               cors:
28 |                 allow_origin:
29 |                 - "*"
30 |                 allow_headers: keep-alive,user-agent,cache-control,content-type,content-transfer-encoding,x-accept-content-transfer-encoding,x-accept-response-streaming,x-user-agent,x-grpc-web,grpc-timeout
31 |                 expose_headers: grpc-status,grpc-message
32 |           http_filters:
33 |           - name: envoy.grpc_web
34 |           - name: envoy.cors
35 |           - name: envoy.router
36 |   clusters:
37 |   - name: ping_pong_service
38 |     connect_timeout: 0.25s
39 |     type: logical_dns
40 |     http2_protocol_options: {}
41 |     lb_policy: round_robin
42 |     hosts: [{ socket_address: { address: host.docker.internal, port_value: 8080 }}]


--------------------------------------------------------------------------------
/public/index.html:
--------------------------------------------------------------------------------
 1 | <!DOCTYPE html>
 2 | <html lang="en">
 3 |   <head>
 4 |     <meta charset="utf-8" />
 5 |     <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
 6 |     <meta name="viewport" content="width=device-width, initial-scale=1" />
 7 |     <meta name="theme-color" content="#000000" />
 8 |     <meta
 9 |       name="description"
10 |       content="Web site created using create-react-app"
11 |     />
12 |     <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
13 |     <!--
14 |       manifest.json provides metadata used when your web app is installed on a
15 |       user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
16 |     -->
17 |     <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
18 |     <!--
19 |       Notice the use of %PUBLIC_URL% in the tags above.
20 |       It will be replaced with the URL of the `public` folder during the build.
21 |       Only files inside the `public` folder can be referenced from the HTML.
22 | 
23 |       Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
24 |       work correctly both with client-side routing and a non-root public URL.
25 |       Learn how to configure a non-root public URL by running `npm run build`.
26 |     -->
27 |     <title>React App</title>
28 |   </head>
29 |   <body>
30 |     <noscript>You need to enable JavaScript to run this app.</noscript>
31 |     <div id="root"></div>
32 |     <!--
33 |       This HTML file is a template.
34 |       If you open it directly in the browser, you will see an empty page.
35 | 
36 |       You can add webfonts, meta tags, or analytics to this file.
37 |       The build step will place the bundled scripts into the <body> tag.
38 | 
39 |       To begin the development, run `npm start` or `yarn start`.
40 |       To create a production bundle, use `npm run build` or `yarn build`.
41 |     -->
42 |   </body>
43 | </html>
44 | 


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
 1 | # General
 2 | .DS_Store
 3 | .AppleDouble
 4 | .LSOverride
 5 | 
 6 | # Icon must end with two \r
 7 | Icon
 8 | 
 9 | # Thumbnails
10 | ._*
11 | 
12 | # Files that might appear in the root of a volume
13 | .DocumentRevisions-V100
14 | .fseventsd
15 | .Spotlight-V100
16 | .TemporaryItems
17 | .Trashes
18 | .VolumeIcon.icns
19 | .com.apple.timemachine.donotpresent
20 | 
21 | # Directories potentially created on remote AFP share
22 | .AppleDB
23 | .AppleDesktop
24 | Network Trash Folder
25 | Temporary Items
26 | .apdisk
27 | Footer
28 | © 2022 GitHub, Inc.
29 | Footer navigation
30 | Terms
31 | Privacy
32 | Security
33 | 
34 | # Logs
35 | logs
36 | *.log
37 | npm-debug.log*
38 | yarn-debug.log*
39 | yarn-error.log*
40 | 
41 | # Runtime data
42 | pids
43 | *.pid
44 | *.seed
45 | *.pid.lock
46 | 
47 | # Directory for instrumented libs generated by jscoverage/JSCover
48 | lib-cov
49 | 
50 | # Coverage directory used by tools like istanbul
51 | coverage
52 | 
53 | # nyc test coverage
54 | .nyc_output
55 | 
56 | # Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
57 | .grunt
58 | 
59 | # Bower dependency directory (https://bower.io/)
60 | bower_components
61 | 
62 | # node-waf configuration
63 | .lock-wscript
64 | 
65 | # Compiled binary addons (http://nodejs.org/api/addons.html)
66 | build/Release
67 | 
68 | # Dependency directories
69 | node_modules/
70 | jspm_packages/
71 | 
72 | # Distribution directories
73 | dist/
74 | 
75 | # Typescript v1 declaration files
76 | typings/
77 | 
78 | # Optional npm cache directory
79 | .npm
80 | 
81 | # Optional eslint cache
82 | .eslintcache
83 | 
84 | # Optional REPL history
85 | .node_repl_history
86 | 
87 | # Output of 'npm pack'
88 | *.tgz
89 | 
90 | # Yarn Integrity file
91 | .yarn-integrity
92 | 
93 | # dotenv environment variables file
94 | .env
95 | 


--------------------------------------------------------------------------------
/src/containers/MessageListContainer.js:
--------------------------------------------------------------------------------
 1 | import React, { useState, useEffect } from 'react';
 2 | import MessageList from '../components/chat/MessageList';
 3 | 
 4 | const MessageListContainer = () => {
 5 | 
 6 |     const [name, setName] = useState("");
 7 |     const [msg, setMsg] = useState("");
 8 |     const [chat, setChat] = useState([]);
 9 | 
10 |     const { ChatClient } = require('../protos/chat_grpc_web_pb');
11 |     const { Message } = require('../protos/chat_pb.js');
12 | 
13 |     const client= new ChatClient('http://localhost:9090', null, null);
14 | 
15 |     useEffect(() => {
16 |         let streamRequest = new Message();
17 |         streamRequest.setUser("user");
18 |         
19 |         var stream = client.join(
20 |             streamRequest,
21 |             null
22 |         );
23 | 
24 |         stream.on('data', function(response) {
25 |             console.log(response);
26 |             setChat(c=>[...c, { name : response.array[0], msg : response.array[1] }]);
27 |         });
28 | 
29 |         return () => {
30 |         };
31 |         
32 |     },[]);
33 |     
34 |     const onNameChange = e => {
35 |         setName(e.target.value);
36 |     }
37 | 
38 |     const onMsgChange = e => {
39 |         setMsg(e.target.value);
40 |     }
41 | 
42 |     const onMessageSubmit = () => {
43 |         setMsg("");
44 |         const request = new Message();
45 |         request.setText(msg);
46 |         request.setUser(name);
47 |         client.send(request, {}, (err, response) => {
48 |             if (response == null) {
49 |               console.log(err)
50 |             }else {
51 |               console.log(response)
52 |             }
53 |         });
54 |     }
55 | 
56 |     return (
57 |         <div>
58 |             <MessageList chat={chat} />
59 |             
60 |             <span>Nickname : </span>
61 |             <input
62 |                 name="name"
63 |                 onChange={onNameChange}
64 |                 value={name}
65 |             />
66 |             <br />
67 |             <span>Message : </span>
68 |             <input
69 |                 name="msg"
70 |                 onChange={onMsgChange}
71 |                 value={msg}
72 |             />
73 |             <button onClick={onMessageSubmit}>Send</button>
74 | 
75 |         </div>
76 |     );
77 | };
78 | 
79 | export default MessageListContainer;
80 | 


--------------------------------------------------------------------------------
/src/logo.svg:
--------------------------------------------------------------------------------
1 | <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3">
2 |     <g fill="#61DAFB">
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7 | </svg>
8 | 


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/README.md:
--------------------------------------------------------------------------------
  1 | # Chat application using gRPC, React
  2 | 
  3 | ![main](images/main.png)
  4 | 
  5 | ## How to use?
  6 | 
  7 | ### Docker
  8 | 
  9 | ```undefined
 10 | docker build -t parkgeonhu/envoy .
 11 | ```
 12 | 
 13 | ```undefined
 14 | docker run -d -p 9090:9090 parkgeonhu/envoy
 15 | ```
 16 | 
 17 | ### gRPC sever
 18 | 
 19 | ```
 20 | node server.js
 21 | ```
 22 | 
 23 | ### react-app
 24 | 
 25 | ```
 26 | yarn install
 27 | yarn start
 28 | ```
 29 | 
 30 | 
 31 | 
 32 | ## Structure
 33 | 
 34 | **프로토콜 버퍼**(Protocol Buffers)는 구조화된 데이터를 [직렬화](https://ko.wikipedia.org/wiki/직렬화)하는 방식이다. 유선이나 데이터 저장을 목적으로 서로 통신할 프로그램을 개발할 때 유용하다. proto파일을 grpc-web용으로 컴파일한 뒤, 아래와 같이 불러온다. 이것으로 서버에 연결하고, 스키마를 불러온다.
 35 | 
 36 | ```javascript
 37 |     const { ChatClient } = require('../protos/chat_grpc_web_pb');
 38 |     const { Message } = require('../protos/chat_pb.js');
 39 | 
 40 |     var client= new ChatClient('http://localhost:9090', null, null);
 41 | ```
 42 | 
 43 | grpc-web 기준으로, 프로토파일을 컴파일 하는 명령어는 다음과 같다. 이 과정을 거치면, proto 파일명을 가진 `[proto file name]_grpc_web_pb.js`, `[proto file name]_pb.js` 두 개의 파일이 생성될 것이다.
 44 | 
 45 | ```protobuf
 46 | syntax = "proto3"; //Specify proto3 version.
 47 | 
 48 | package example; //Optional: unique package name.
 49 | 
 50 | service Chat { //Service class to be used by the clients
 51 |     rpc join(Message) returns (stream Message){}
 52 |     rpc send(Message) returns (Message){}
 53 | }
 54 | 
 55 | message Message { //Information that will be passed between client and service
 56 |     string user = 1;
 57 |     string text = 2;
 58 | }
 59 | ```
 60 | 
 61 | ```bash
 62 | protoc -I=. [protofile] --js_out=import_style=commonjs:. --grpc-web_out=import_style=commonjs,mode=grpcwebtext:.
 63 | ```
 64 | 
 65 | react hook 중 하나인 useEffect를 이용해 컴포넌트가 마운트 될 때 stream 객체에 이벤트리스너를 붙여준다. `stream.on('data')` 는 스트림객체에서 데이터를 받을 때마다 두번째 인자로 콜백함수를 실행시킨다.
 66 | 
 67 | ```javascript
 68 |     useEffect(() => {
 69 |         let streamRequest = new Message();
 70 |         streamRequest.setUser("user");
 71 | 
 72 |         var stream = client.join(
 73 |             streamRequest,
 74 |             null
 75 |         );
 76 | 
 77 |         stream.on('data', function(response) {
 78 |             console.log(response);
 79 |             setChat(c => [...c, { name : response.array[0], msg : response.array[1] }]);
 80 |         });
 81 | 
 82 |         return () => {
 83 |         };
 84 | 
 85 |     },[]);
 86 | ```
 87 | 
 88 | 메시지를 보낼 때는 proto파일에서 만들었던 스키마를 불러와서, 객체를 만들어준다. 그 뒤로, set을 통하여 그 객체에 정보를 담는다. 아래의 코드와 같다.
 89 | 
 90 | ```javascript
 91 |         const request = new Message();
 92 |         request.setText(msg);
 93 |         request.setUser(name);
 94 |         client.send(request, {}, (err, response) => {
 95 |             if (response == null) {
 96 |               console.log(err)
 97 |             }else {
 98 |               console.log(response)
 99 |             }
100 |         });
101 | ```
102 | 
103 | https://github.com/grpc/grpc-web/issues/347
104 | 
105 | gRPC web-client won’t send HTTP2 requests. Instead, you need a proxy between your web-client and gRPC backend service for converting that HTTP1 request to HTTP2. gRPC web client has built-in support for Envoy as a proxy. You can find more information about this [here](https://grpc.io/blog/state-of-grpc-web#f2).
106 | 
107 | gRPC web-client는 http2 request를 보내지 않는다. 대신 proxy를 web-client와 gRPC 백엔드 서버 사이에 둠으로써 http1 요청을 http2 요청으로 변환한다. gRPC web-client는 Envoy를 프록시로서 기본적으로 지원한다. 따라서 아래의 명령어대로 DockerFile을 build하고 run 한다.
108 | 
109 | ```
110 | docker build -t parkgeonhu/envoy .
111 | ```
112 | 
113 | ```
114 | docker run -d -p 9090:9090 parkgeonhu/envoy
115 | ```
116 | 
117 | 다음은 node.js 기반 gRPC 백엔드 서버 코드다. 이것은 `node server.js`로 실행시켜주도록 한다. 이제 클라이언트에서 메시지를 보내면 envoy proxy server를 거쳐서 이 서버로 넘어오게 될 것이다. 서버로 넘어오게 되면, ServerWritableStream 이 넘어온다. 이것을 이용해 server side streaming이 가능하다. notifyChat 함수를 보면 `user.write` 를 통해 메시지를 전달하고 있다.
118 | 
119 | ```javascript
120 | let grpc = require("grpc");
121 | var protoLoader = require("@grpc/proto-loader");
122 |  
123 | const server = new grpc.Server();
124 | const SERVER_ADDRESS = "localhost:8080";
125 |  
126 | // Load protobuf
127 | let proto = grpc.loadPackageDefinition(
128 |   protoLoader.loadSync("src/protos/chat.proto", {
129 |     keepCase: true,
130 |     longs: String,
131 |     enums: String,
132 |     defaults: true,
133 |     oneofs: true
134 |   })
135 | );
136 |  
137 | let users = [];
138 |  
139 | // Receive message from client joining
140 | function join(call, callback) {
141 |   console.log(call)
142 |   users.push(call);
143 |   notifyChat({ user: "Server", text: "new user joined ..." });
144 | }
145 |  
146 | // Receive message from client
147 | function send(call, callback) {
148 |   console.log(call.request);
149 |   
150 |   notifyChat(call.request);
151 |   console.log(callback)
152 |   return callback(null,{text:call.request.text})
153 | }
154 |  
155 | // Send message to all connected clients
156 | function notifyChat(message) {
157 |   users.forEach(user => {
158 |     user.write(message);
159 |   });
160 | }
161 |  
162 | // Define server with the methods and start it
163 | server.addService(proto.example.Chat.service, { join: join, send: send });
164 |  
165 | server.bind(SERVER_ADDRESS, grpc.ServerCredentials.createInsecure());
166 | 
167 | console.log("Start Server!");
168 | 
169 | server.start();
170 | ```
171 | 


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/src/serviceWorker.js:
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  1 | // This optional code is used to register a service worker.
  2 | // register() is not called by default.
  3 | 
  4 | // This lets the app load faster on subsequent visits in production, and gives
  5 | // it offline capabilities. However, it also means that developers (and users)
  6 | // will only see deployed updates on subsequent visits to a page, after all the
  7 | // existing tabs open on the page have been closed, since previously cached
  8 | // resources are updated in the background.
  9 | 
 10 | // To learn more about the benefits of this model and instructions on how to
 11 | // opt-in, read https://bit.ly/CRA-PWA
 12 | 
 13 | const isLocalhost = Boolean(
 14 |   window.location.hostname === 'localhost' ||
 15 |     // [::1] is the IPv6 localhost address.
 16 |     window.location.hostname === '[::1]' ||
 17 |     // 127.0.0.0/8 are considered localhost for IPv4.
 18 |     window.location.hostname.match(
 19 |       /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
 20 |     )
 21 | );
 22 | 
 23 | export function register(config) {
 24 |   if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
 25 |     // The URL constructor is available in all browsers that support SW.
 26 |     const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
 27 |     if (publicUrl.origin !== window.location.origin) {
 28 |       // Our service worker won't work if PUBLIC_URL is on a different origin
 29 |       // from what our page is served on. This might happen if a CDN is used to
 30 |       // serve assets; see https://github.com/facebook/create-react-app/issues/2374
 31 |       return;
 32 |     }
 33 | 
 34 |     window.addEventListener('load', () => {
 35 |       const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
 36 | 
 37 |       if (isLocalhost) {
 38 |         // This is running on localhost. Let's check if a service worker still exists or not.
 39 |         checkValidServiceWorker(swUrl, config);
 40 | 
 41 |         // Add some additional logging to localhost, pointing developers to the
 42 |         // service worker/PWA documentation.
 43 |         navigator.serviceWorker.ready.then(() => {
 44 |           console.log(
 45 |             'This web app is being served cache-first by a service ' +
 46 |               'worker. To learn more, visit https://bit.ly/CRA-PWA'
 47 |           );
 48 |         });
 49 |       } else {
 50 |         // Is not localhost. Just register service worker
 51 |         registerValidSW(swUrl, config);
 52 |       }
 53 |     });
 54 |   }
 55 | }
 56 | 
 57 | function registerValidSW(swUrl, config) {
 58 |   navigator.serviceWorker
 59 |     .register(swUrl)
 60 |     .then(registration => {
 61 |       registration.onupdatefound = () => {
 62 |         const installingWorker = registration.installing;
 63 |         if (installingWorker == null) {
 64 |           return;
 65 |         }
 66 |         installingWorker.onstatechange = () => {
 67 |           if (installingWorker.state === 'installed') {
 68 |             if (navigator.serviceWorker.controller) {
 69 |               // At this point, the updated precached content has been fetched,
 70 |               // but the previous service worker will still serve the older
 71 |               // content until all client tabs are closed.
 72 |               console.log(
 73 |                 'New content is available and will be used when all ' +
 74 |                   'tabs for this page are closed. See https://bit.ly/CRA-PWA.'
 75 |               );
 76 | 
 77 |               // Execute callback
 78 |               if (config && config.onUpdate) {
 79 |                 config.onUpdate(registration);
 80 |               }
 81 |             } else {
 82 |               // At this point, everything has been precached.
 83 |               // It's the perfect time to display a
 84 |               // "Content is cached for offline use." message.
 85 |               console.log('Content is cached for offline use.');
 86 | 
 87 |               // Execute callback
 88 |               if (config && config.onSuccess) {
 89 |                 config.onSuccess(registration);
 90 |               }
 91 |             }
 92 |           }
 93 |         };
 94 |       };
 95 |     })
 96 |     .catch(error => {
 97 |       console.error('Error during service worker registration:', error);
 98 |     });
 99 | }
100 | 
101 | function checkValidServiceWorker(swUrl, config) {
102 |   // Check if the service worker can be found. If it can't reload the page.
103 |   fetch(swUrl, {
104 |     headers: { 'Service-Worker': 'script' },
105 |   })
106 |     .then(response => {
107 |       // Ensure service worker exists, and that we really are getting a JS file.
108 |       const contentType = response.headers.get('content-type');
109 |       if (
110 |         response.status === 404 ||
111 |         (contentType != null && contentType.indexOf('javascript') === -1)
112 |       ) {
113 |         // No service worker found. Probably a different app. Reload the page.
114 |         navigator.serviceWorker.ready.then(registration => {
115 |           registration.unregister().then(() => {
116 |             window.location.reload();
117 |           });
118 |         });
119 |       } else {
120 |         // Service worker found. Proceed as normal.
121 |         registerValidSW(swUrl, config);
122 |       }
123 |     })
124 |     .catch(() => {
125 |       console.log(
126 |         'No internet connection found. App is running in offline mode.'
127 |       );
128 |     });
129 | }
130 | 
131 | export function unregister() {
132 |   if ('serviceWorker' in navigator) {
133 |     navigator.serviceWorker.ready
134 |       .then(registration => {
135 |         registration.unregister();
136 |       })
137 |       .catch(error => {
138 |         console.error(error.message);
139 |       });
140 |   }
141 | }
142 | 


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/src/protos/chat_pb.js:
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  1 | /**
  2 |  * @fileoverview
  3 |  * @enhanceable
  4 |  * @suppress {messageConventions} JS Compiler reports an error if a variable or
  5 |  *     field starts with 'MSG_' and isn't a translatable message.
  6 |  * @public
  7 |  */
  8 | // GENERATED CODE -- DO NOT EDIT!
  9 | /* eslint-disable */
 10 | 
 11 | var jspb = require('google-protobuf');
 12 | var goog = jspb;
 13 | var global = Function('return this')();
 14 | 
 15 | goog.exportSymbol('proto.example.Message', null, global);
 16 | 
 17 | /**
 18 |  * Generated by JsPbCodeGenerator.
 19 |  * @param {Array=} opt_data Optional initial data array, typically from a
 20 |  * server response, or constructed directly in Javascript. The array is used
 21 |  * in place and becomes part of the constructed object. It is not cloned.
 22 |  * If no data is provided, the constructed object will be empty, but still
 23 |  * valid.
 24 |  * @extends {jspb.Message}
 25 |  * @constructor
 26 |  */
 27 | proto.example.Message = function(opt_data) {
 28 |   jspb.Message.initialize(this, opt_data, 0, -1, null, null);
 29 | };
 30 | goog.inherits(proto.example.Message, jspb.Message);
 31 | if (goog.DEBUG && !COMPILED) {
 32 |   proto.example.Message.displayName = 'proto.example.Message';
 33 | }
 34 | 
 35 | 
 36 | if (jspb.Message.GENERATE_TO_OBJECT) {
 37 | /**
 38 |  * Creates an object representation of this proto suitable for use in Soy templates.
 39 |  * Field names that are reserved in JavaScript and will be renamed to pb_name.
 40 |  * To access a reserved field use, foo.pb_<name>, eg, foo.pb_default.
 41 |  * For the list of reserved names please see:
 42 |  *     com.google.apps.jspb.JsClassTemplate.JS_RESERVED_WORDS.
 43 |  * @param {boolean=} opt_includeInstance Whether to include the JSPB instance
 44 |  *     for transitional soy proto support: http://goto/soy-param-migration
 45 |  * @return {!Object}
 46 |  */
 47 | proto.example.Message.prototype.toObject = function(opt_includeInstance) {
 48 |   return proto.example.Message.toObject(opt_includeInstance, this);
 49 | };
 50 | 
 51 | 
 52 | /**
 53 |  * Static version of the {@see toObject} method.
 54 |  * @param {boolean|undefined} includeInstance Whether to include the JSPB
 55 |  *     instance for transitional soy proto support:
 56 |  *     http://goto/soy-param-migration
 57 |  * @param {!proto.example.Message} msg The msg instance to transform.
 58 |  * @return {!Object}
 59 |  * @suppress {unusedLocalVariables} f is only used for nested messages
 60 |  */
 61 | proto.example.Message.toObject = function(includeInstance, msg) {
 62 |   var f, obj = {
 63 |     user: jspb.Message.getFieldWithDefault(msg, 1, ""),
 64 |     text: jspb.Message.getFieldWithDefault(msg, 2, "")
 65 |   };
 66 | 
 67 |   if (includeInstance) {
 68 |     obj.$jspbMessageInstance = msg;
 69 |   }
 70 |   return obj;
 71 | };
 72 | }
 73 | 
 74 | 
 75 | /**
 76 |  * Deserializes binary data (in protobuf wire format).
 77 |  * @param {jspb.ByteSource} bytes The bytes to deserialize.
 78 |  * @return {!proto.example.Message}
 79 |  */
 80 | proto.example.Message.deserializeBinary = function(bytes) {
 81 |   var reader = new jspb.BinaryReader(bytes);
 82 |   var msg = new proto.example.Message;
 83 |   return proto.example.Message.deserializeBinaryFromReader(msg, reader);
 84 | };
 85 | 
 86 | 
 87 | /**
 88 |  * Deserializes binary data (in protobuf wire format) from the
 89 |  * given reader into the given message object.
 90 |  * @param {!proto.example.Message} msg The message object to deserialize into.
 91 |  * @param {!jspb.BinaryReader} reader The BinaryReader to use.
 92 |  * @return {!proto.example.Message}
 93 |  */
 94 | proto.example.Message.deserializeBinaryFromReader = function(msg, reader) {
 95 |   while (reader.nextField()) {
 96 |     if (reader.isEndGroup()) {
 97 |       break;
 98 |     }
 99 |     var field = reader.getFieldNumber();
100 |     switch (field) {
101 |     case 1:
102 |       var value = /** @type {string} */ (reader.readString());
103 |       msg.setUser(value);
104 |       break;
105 |     case 2:
106 |       var value = /** @type {string} */ (reader.readString());
107 |       msg.setText(value);
108 |       break;
109 |     default:
110 |       reader.skipField();
111 |       break;
112 |     }
113 |   }
114 |   return msg;
115 | };
116 | 
117 | 
118 | /**
119 |  * Serializes the message to binary data (in protobuf wire format).
120 |  * @return {!Uint8Array}
121 |  */
122 | proto.example.Message.prototype.serializeBinary = function() {
123 |   var writer = new jspb.BinaryWriter();
124 |   proto.example.Message.serializeBinaryToWriter(this, writer);
125 |   return writer.getResultBuffer();
126 | };
127 | 
128 | 
129 | /**
130 |  * Serializes the given message to binary data (in protobuf wire
131 |  * format), writing to the given BinaryWriter.
132 |  * @param {!proto.example.Message} message
133 |  * @param {!jspb.BinaryWriter} writer
134 |  * @suppress {unusedLocalVariables} f is only used for nested messages
135 |  */
136 | proto.example.Message.serializeBinaryToWriter = function(message, writer) {
137 |   var f = undefined;
138 |   f = message.getUser();
139 |   if (f.length > 0) {
140 |     writer.writeString(
141 |       1,
142 |       f
143 |     );
144 |   }
145 |   f = message.getText();
146 |   if (f.length > 0) {
147 |     writer.writeString(
148 |       2,
149 |       f
150 |     );
151 |   }
152 | };
153 | 
154 | 
155 | /**
156 |  * optional string user = 1;
157 |  * @return {string}
158 |  */
159 | proto.example.Message.prototype.getUser = function() {
160 |   return /** @type {string} */ (jspb.Message.getFieldWithDefault(this, 1, ""));
161 | };
162 | 
163 | 
164 | /** @param {string} value */
165 | proto.example.Message.prototype.setUser = function(value) {
166 |   jspb.Message.setProto3StringField(this, 1, value);
167 | };
168 | 
169 | 
170 | /**
171 |  * optional string text = 2;
172 |  * @return {string}
173 |  */
174 | proto.example.Message.prototype.getText = function() {
175 |   return /** @type {string} */ (jspb.Message.getFieldWithDefault(this, 2, ""));
176 | };
177 | 
178 | 
179 | /** @param {string} value */
180 | proto.example.Message.prototype.setText = function(value) {
181 |   jspb.Message.setProto3StringField(this, 2, value);
182 | };
183 | 
184 | 
185 | goog.object.extend(exports, proto.example);
186 | 


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/src/protos/chat_grpc_web_pb.js:
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  1 | /**
  2 |  * @fileoverview gRPC-Web generated client stub for example
  3 |  * @enhanceable
  4 |  * @public
  5 |  */
  6 | 
  7 | // GENERATED CODE -- DO NOT EDIT!
  8 | 
  9 | 
 10 | /* eslint-disable */
 11 | // @ts-nocheck
 12 | 
 13 | 
 14 | 
 15 | const grpc = {};
 16 | grpc.web = require('grpc-web');
 17 | 
 18 | const proto = {};
 19 | proto.example = require('./chat_pb.js');
 20 | 
 21 | /**
 22 |  * @param {string} hostname
 23 |  * @param {?Object} credentials
 24 |  * @param {?Object} options
 25 |  * @constructor
 26 |  * @struct
 27 |  * @final
 28 |  */
 29 | proto.example.ChatClient =
 30 |     function(hostname, credentials, options) {
 31 |   if (!options) options = {};
 32 |   options['format'] = 'text';
 33 | 
 34 |   /**
 35 |    * @private @const {!grpc.web.GrpcWebClientBase} The client
 36 |    */
 37 |   this.client_ = new grpc.web.GrpcWebClientBase(options);
 38 | 
 39 |   /**
 40 |    * @private @const {string} The hostname
 41 |    */
 42 |   this.hostname_ = hostname;
 43 | 
 44 | };
 45 | 
 46 | 
 47 | /**
 48 |  * @param {string} hostname
 49 |  * @param {?Object} credentials
 50 |  * @param {?Object} options
 51 |  * @constructor
 52 |  * @struct
 53 |  * @final
 54 |  */
 55 | proto.example.ChatPromiseClient =
 56 |     function(hostname, credentials, options) {
 57 |   if (!options) options = {};
 58 |   options['format'] = 'text';
 59 | 
 60 |   /**
 61 |    * @private @const {!grpc.web.GrpcWebClientBase} The client
 62 |    */
 63 |   this.client_ = new grpc.web.GrpcWebClientBase(options);
 64 | 
 65 |   /**
 66 |    * @private @const {string} The hostname
 67 |    */
 68 |   this.hostname_ = hostname;
 69 | 
 70 | };
 71 | 
 72 | 
 73 | /**
 74 |  * @const
 75 |  * @type {!grpc.web.MethodDescriptor<
 76 |  *   !proto.example.Message,
 77 |  *   !proto.example.Message>}
 78 |  */
 79 | const methodDescriptor_Chat_join = new grpc.web.MethodDescriptor(
 80 |   '/example.Chat/join',
 81 |   grpc.web.MethodType.SERVER_STREAMING,
 82 |   proto.example.Message,
 83 |   proto.example.Message,
 84 |   /**
 85 |    * @param {!proto.example.Message} request
 86 |    * @return {!Uint8Array}
 87 |    */
 88 |   function(request) {
 89 |     return request.serializeBinary();
 90 |   },
 91 |   proto.example.Message.deserializeBinary
 92 | );
 93 | 
 94 | 
 95 | /**
 96 |  * @const
 97 |  * @type {!grpc.web.AbstractClientBase.MethodInfo<
 98 |  *   !proto.example.Message,
 99 |  *   !proto.example.Message>}
100 |  */
101 | const methodInfo_Chat_join = new grpc.web.AbstractClientBase.MethodInfo(
102 |   proto.example.Message,
103 |   /**
104 |    * @param {!proto.example.Message} request
105 |    * @return {!Uint8Array}
106 |    */
107 |   function(request) {
108 |     return request.serializeBinary();
109 |   },
110 |   proto.example.Message.deserializeBinary
111 | );
112 | 
113 | 
114 | /**
115 |  * @param {!proto.example.Message} request The request proto
116 |  * @param {?Object<string, string>} metadata User defined
117 |  *     call metadata
118 |  * @return {!grpc.web.ClientReadableStream<!proto.example.Message>}
119 |  *     The XHR Node Readable Stream
120 |  */
121 | proto.example.ChatClient.prototype.join =
122 |     function(request, metadata) {
123 |   return this.client_.serverStreaming(this.hostname_ +
124 |       '/example.Chat/join',
125 |       request,
126 |       metadata || {},
127 |       methodDescriptor_Chat_join);
128 | };
129 | 
130 | 
131 | /**
132 |  * @param {!proto.example.Message} request The request proto
133 |  * @param {?Object<string, string>} metadata User defined
134 |  *     call metadata
135 |  * @return {!grpc.web.ClientReadableStream<!proto.example.Message>}
136 |  *     The XHR Node Readable Stream
137 |  */
138 | proto.example.ChatPromiseClient.prototype.join =
139 |     function(request, metadata) {
140 |   return this.client_.serverStreaming(this.hostname_ +
141 |       '/example.Chat/join',
142 |       request,
143 |       metadata || {},
144 |       methodDescriptor_Chat_join);
145 | };
146 | 
147 | 
148 | /**
149 |  * @const
150 |  * @type {!grpc.web.MethodDescriptor<
151 |  *   !proto.example.Message,
152 |  *   !proto.example.Message>}
153 |  */
154 | const methodDescriptor_Chat_send = new grpc.web.MethodDescriptor(
155 |   '/example.Chat/send',
156 |   grpc.web.MethodType.UNARY,
157 |   proto.example.Message,
158 |   proto.example.Message,
159 |   /**
160 |    * @param {!proto.example.Message} request
161 |    * @return {!Uint8Array}
162 |    */
163 |   function(request) {
164 |     return request.serializeBinary();
165 |   },
166 |   proto.example.Message.deserializeBinary
167 | );
168 | 
169 | 
170 | /**
171 |  * @const
172 |  * @type {!grpc.web.AbstractClientBase.MethodInfo<
173 |  *   !proto.example.Message,
174 |  *   !proto.example.Message>}
175 |  */
176 | const methodInfo_Chat_send = new grpc.web.AbstractClientBase.MethodInfo(
177 |   proto.example.Message,
178 |   /**
179 |    * @param {!proto.example.Message} request
180 |    * @return {!Uint8Array}
181 |    */
182 |   function(request) {
183 |     return request.serializeBinary();
184 |   },
185 |   proto.example.Message.deserializeBinary
186 | );
187 | 
188 | 
189 | /**
190 |  * @param {!proto.example.Message} request The
191 |  *     request proto
192 |  * @param {?Object<string, string>} metadata User defined
193 |  *     call metadata
194 |  * @param {function(?grpc.web.Error, ?proto.example.Message)}
195 |  *     callback The callback function(error, response)
196 |  * @return {!grpc.web.ClientReadableStream<!proto.example.Message>|undefined}
197 |  *     The XHR Node Readable Stream
198 |  */
199 | proto.example.ChatClient.prototype.send =
200 |     function(request, metadata, callback) {
201 |   return this.client_.rpcCall(this.hostname_ +
202 |       '/example.Chat/send',
203 |       request,
204 |       metadata || {},
205 |       methodDescriptor_Chat_send,
206 |       callback);
207 | };
208 | 
209 | 
210 | /**
211 |  * @param {!proto.example.Message} request The
212 |  *     request proto
213 |  * @param {?Object<string, string>} metadata User defined
214 |  *     call metadata
215 |  * @return {!Promise<!proto.example.Message>}
216 |  *     A native promise that resolves to the response
217 |  */
218 | proto.example.ChatPromiseClient.prototype.send =
219 |     function(request, metadata) {
220 |   return this.client_.unaryCall(this.hostname_ +
221 |       '/example.Chat/send',
222 |       request,
223 |       metadata || {},
224 |       methodDescriptor_Chat_send);
225 | };
226 | 
227 | 
228 | module.exports = proto.example;
229 | 
230 | 


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