├── .editorconfig ├── .gitignore ├── LICENSE ├── README.md ├── client ├── .env.example ├── .eslintrc ├── README.md ├── package-lock.json ├── package.json ├── public │ ├── index.html │ ├── manifest.json │ └── robots.txt └── src │ ├── App.js │ ├── index.js │ └── styles.css ├── package-lock.json ├── package.json ├── server ├── .eslintrc.js ├── README.md ├── package-lock.json ├── package.json ├── serverless.yml ├── src │ ├── graphql.js │ ├── models │ │ ├── Client.js │ │ └── Topic.js │ ├── publish.js │ ├── utils │ │ ├── dynamodb.js │ │ ├── publish.js │ │ └── subscribe.js │ └── websocket.js └── webpack.config.js └── showtime.gif /.editorconfig: -------------------------------------------------------------------------------- 1 | # EditorConfig is awesome: http://EditorConfig.org 2 | 3 | # top-most EditorConfig file 4 | root = true 5 | 6 | [*] 7 | indent_style = tab 8 | indent_size = 2 9 | end_of_line = lf 10 | charset = utf-8 11 | insert_final_newline = true 12 | max_line_length = 100 13 | 14 | [*.yml] 15 | indent_style = spaces 16 | indent_size = 2 17 | 18 | [*.md] 19 | trim_trailing_whitespace = false 20 | 21 | [*.js] 22 | trim_trailing_whitespace = true 23 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # See https://help.github.com/articles/ignoring-files/ for more about ignoring files. 2 | 3 | # dependencies 4 | node_modules 5 | /.pnp 6 | .pnp.js 7 | 8 | # testing 9 | /coverage 10 | 11 | # production 12 | client/build 13 | 14 | # misc 15 | .DS_Store 16 | .env 17 | .env.local 18 | .env.development.local 19 | .env.test.local 20 | .env.production.local 21 | 22 | npm-debug.log* 23 | yarn-debug.log* 24 | yarn-error.log* 25 | 26 | # Serverless directories 27 | server/.serverless 28 | server/.dynamodb 29 | server/.webpack 30 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2019 AlpacaGoesCrazy 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ## Apollo server subscriptions on AWS Lambda 2 | 3 | This is an example application which shows how to implement apollo-server-lambda with subscriptions. 4 | For subscriptions implementation AWS API Gateway Websockets and DynamoDB were used 5 | 6 | ![](./showtime.gif) 7 | -------------------------------------------------------------------------------- /client/.env.example: -------------------------------------------------------------------------------- 1 | REACT_APP_SUBSCRIPTION_ENDPOINT="ws://localhost:3001" 2 | REACT_APP_HTTP_ENDPOINT="http://localhost:3000/graphql" 3 | -------------------------------------------------------------------------------- /client/.eslintrc: -------------------------------------------------------------------------------- 1 | { 2 | "extends": "react-app", 3 | "env": { 4 | "browser": true, 5 | "node": true, 6 | "es6": true 7 | }, 8 | "globals": { 9 | "nconf": true 10 | }, 11 | "parser": "babel-eslint", 12 | "plugins": ["react"], 13 | 14 | "parserOptions": { 15 | "ecmaVersion": 6, 16 | "sourceType": "module", 17 | }, 18 | "rules": { 19 | "indent": [ 20 | "error", 21 | "tab", 22 | { "SwitchCase": 1 } 23 | ], 24 | "linebreak-style": [ 25 | "error", 26 | "unix" 27 | ], 28 | "quotes": [ 29 | "error", 30 | "single" 31 | ], 32 | "semi": [ 33 | "error", 34 | "never" 35 | ], 36 | "no-console": "error" 37 | } 38 | } -------------------------------------------------------------------------------- /client/README.md: -------------------------------------------------------------------------------- 1 | This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app). 2 | 3 | ## Available Scripts 4 | 5 | In the project directory, you can run: 6 | 7 | ### `npm start` 8 | 9 | Runs the app in the development mode.
10 | Open [http://localhost:3000](http://localhost:3000) to view it in the browser. 11 | 12 | The page will reload if you make edits.
13 | You will also see any lint errors in the console. 14 | 15 | ### `npm test` 16 | 17 | Launches the test runner in the interactive watch mode.
18 | See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information. 19 | 20 | ### `npm run build` 21 | 22 | Builds the app for production to the `build` folder.
23 | It correctly bundles React in production mode and optimizes the build for the best performance. 24 | 25 | The build is minified and the filenames include the hashes.
26 | Your app is ready to be deployed! 27 | 28 | See the section about [deployment](https://facebook.github.io/create-react-app/docs/deployment) for more information. 29 | 30 | ### `npm run eject` 31 | 32 | **Note: this is a one-way operation. Once you `eject`, you can’t go back!** 33 | 34 | If you aren’t satisfied with the build tool and configuration choices, you can `eject` at any time. This command will remove the single build dependency from your project. 35 | 36 | Instead, it will copy all the configuration files and the transitive dependencies (Webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except `eject` will still work, but they will point to the copied scripts so you can tweak them. At this point you’re on your own. 37 | 38 | You don’t have to ever use `eject`. The curated feature set is suitable for small and middle deployments, and you shouldn’t feel obligated to use this feature. However we understand that this tool wouldn’t be useful if you couldn’t customize it when you are ready for it. 39 | 40 | ## Learn More 41 | 42 | You can learn more in the [Create React App documentation](https://facebook.github.io/create-react-app/docs/getting-started). 43 | 44 | To learn React, check out the [React documentation](https://reactjs.org/). 45 | 46 | ### Code Splitting 47 | 48 | This section has moved here: https://facebook.github.io/create-react-app/docs/code-splitting 49 | 50 | ### Analyzing the Bundle Size 51 | 52 | This section has moved here: https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size 53 | 54 | ### Making a Progressive Web App 55 | 56 | This section has moved here: https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app 57 | 58 | ### Advanced Configuration 59 | 60 | This section has moved here: https://facebook.github.io/create-react-app/docs/advanced-configuration 61 | 62 | ### Deployment 63 | 64 | This section has moved here: https://facebook.github.io/create-react-app/docs/deployment 65 | 66 | ### `npm run build` fails to minify 67 | 68 | This section has moved here: https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify 69 | -------------------------------------------------------------------------------- /client/package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "client", 3 | "version": "1.0.0", 4 | "dependencies": { 5 | "@apollo/react-hooks": "^3.1.0", 6 | "@material-ui/core": "^4.4.2", 7 | "apollo-cache-inmemory": "^1.6.3", 8 | "apollo-client": "^2.6.4", 9 | "apollo-link": "^1.2.13", 10 | "apollo-link-http": "^1.5.16", 11 | "apollo-link-ws": "^1.0.19", 12 | "apollo-utilities": "^1.3.2", 13 | "graphql-tag": "^2.10.1", 14 | "react": "^16.9.0", 15 | "react-dom": "^16.9.0", 16 | "react-scripts": "3.1.1", 17 | "subscriptions-transport-ws": "^0.9.16" 18 | }, 19 | "scripts": { 20 | "start": "react-scripts start", 21 | "build": "react-scripts build", 22 | "test": "react-scripts test", 23 | "eject": "react-scripts eject" 24 | }, 25 | "browserslist": { 26 | "production": [ 27 | ">0.2%", 28 | "not dead", 29 | "not op_mini all" 30 | ], 31 | "development": [ 32 | "last 1 chrome version", 33 | "last 1 firefox version", 34 | "last 1 safari version" 35 | ] 36 | } 37 | } 38 | -------------------------------------------------------------------------------- /client/public/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 11 | 12 | Serverless Websockets 13 | 14 | 15 | 16 |
17 | 18 | 19 | -------------------------------------------------------------------------------- /client/public/manifest.json: -------------------------------------------------------------------------------- 1 | { 2 | "short_name": "Serverless Websockets", 3 | "name": "Serverless Websockets", 4 | "display": "standalone", 5 | "theme_color": "#000000", 6 | "background_color": "#ffffff" 7 | } 8 | -------------------------------------------------------------------------------- /client/public/robots.txt: -------------------------------------------------------------------------------- 1 | # https://www.robotstxt.org/robotstxt.html 2 | User-agent: * 3 | -------------------------------------------------------------------------------- /client/src/App.js: -------------------------------------------------------------------------------- 1 | import React, { Fragment, useState, useRef } from 'react' 2 | import { useSubscription, useMutation } from '@apollo/react-hooks' 3 | import gql from 'graphql-tag' 4 | 5 | import TextField from '@material-ui/core/TextField' 6 | import Button from '@material-ui/core/Button' 7 | import List from '@material-ui/core/List' 8 | import ListItem from '@material-ui/core/ListItem' 9 | 10 | import './styles.css' 11 | 12 | const listenMessageSubscription = gql` 13 | subscription listenMessage { 14 | listenMessage 15 | } 16 | ` 17 | const sendMessageMutation = gql` 18 | mutation sendMessage($message: String!) { 19 | sendMessage(message: $message) 20 | } 21 | ` 22 | 23 | function App() { 24 | const [messages, setMessages] = useState([]) 25 | const [input, setInput] = useState('') 26 | const [username, setUsername] = useState('Anonymous') 27 | const messageBoxRef = useRef() 28 | 29 | const onSubscriptionData = ({ subscriptionData: { data: { listenMessage } } }) => { 30 | setMessages(messages => [...messages, listenMessage]) 31 | messageBoxRef.current.scrollTop = messageBoxRef.current.scrollHeight 32 | } 33 | 34 | useSubscription(listenMessageSubscription, { onSubscriptionData }) 35 | const [sendMessage] = useMutation(sendMessageMutation) 36 | 37 | const handleSend = () => { 38 | if(input) { 39 | sendMessage({ variables: { message: `${username}: ${input}` } }) 40 | setInput('') 41 | } 42 | } 43 | 44 | const handleKeyPress = e => { 45 | if(e.charCode === 13) { 46 | handleSend() 47 | } 48 | } 49 | 50 | return ( 51 | 52 | 53 | {messages.map((message, i) => 54 | 55 | {message} 56 | 57 | )} 58 | 59 |
60 | setUsername(e.target.value)} 65 | /> 66 | setInput(e.target.value)} 74 | 75 | /> 76 | 79 |
80 | 81 | ) 82 | } 83 | 84 | export default App 85 | -------------------------------------------------------------------------------- /client/src/index.js: -------------------------------------------------------------------------------- 1 | import React from 'react' 2 | import ReactDOM from 'react-dom' 3 | import { ApolloClient } from 'apollo-client' 4 | import { ApolloProvider } from '@apollo/react-hooks' 5 | import { split } from 'apollo-link' 6 | import { HttpLink } from 'apollo-link-http' 7 | import { WebSocketLink } from 'apollo-link-ws' 8 | import { SubscriptionClient } from 'subscriptions-transport-ws' 9 | import { getMainDefinition } from 'apollo-utilities' 10 | import { InMemoryCache } from 'apollo-cache-inmemory' 11 | 12 | import App from './App' 13 | 14 | const http_endpoint = process.env.REACT_APP_HTTP_ENDPOINT 15 | const ws_endpoint = process.env.REACT_APP_SUBSCRIPTION_ENDPOINT 16 | 17 | const subClient = new SubscriptionClient(ws_endpoint, { lazy: true, reconnect: true }, null, []) 18 | const wsLink = new WebSocketLink(subClient) 19 | const httpLink = new HttpLink({ uri: http_endpoint }) 20 | 21 | const link = split( 22 | ({ query }) => { 23 | const definition = getMainDefinition(query) 24 | return ( 25 | definition.kind === 'OperationDefinition' && 26 | definition.operation === 'subscription' 27 | ) 28 | }, 29 | wsLink, 30 | httpLink, 31 | ) 32 | 33 | const client = new ApolloClient({ 34 | cache: new InMemoryCache(), 35 | link 36 | }) 37 | 38 | ReactDOM.render( 39 | ( 40 | 41 | ), 42 | document.getElementById('root') 43 | ) 44 | 45 | 46 | -------------------------------------------------------------------------------- /client/src/styles.css: -------------------------------------------------------------------------------- 1 | * { box-sizing: border-box; } 2 | body { 3 | margin: 0; 4 | padding: 10px; 5 | height: 100vh; 6 | font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", 7 | "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", 8 | sans-serif; 9 | -webkit-font-smoothing: antialiased; 10 | -moz-osx-font-smoothing: grayscale; 11 | } 12 | 13 | #root { 14 | height: 100%; 15 | display: flex; 16 | flex-direction: column; 17 | } 18 | 19 | .message-container { 20 | overflow: auto; 21 | border: solid 1px #000; 22 | margin-bottom: 10px; 23 | flex-grow: 2; 24 | } 25 | 26 | .message-container li { 27 | border-bottom: 1px solid rgba(0,0,0,.2); 28 | } 29 | 30 | .control-panel { 31 | display: flex; 32 | margin-top: 10px; 33 | } 34 | 35 | .control-panel div { 36 | margin-right: 10px; 37 | } 38 | 39 | .input-message { 40 | flex-grow: 2 41 | } -------------------------------------------------------------------------------- /package-lock.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "serverless-graphql-subscriptions", 3 | "version": "1.0.0", 4 | "lockfileVersion": 1, 5 | "requires": true, 6 | "dependencies": { 7 | "@babel/code-frame": { 8 | "version": 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"version": "1.0.0", 4 | "description": "Example of graphql subscriptions application done using aws lambda and aws websockets api gateway", 5 | "author": "github.com/AlpacaGoesCrazy", 6 | "scripts": { 7 | "test": "echo \"Error: no test specified\" && exit 1" 8 | }, 9 | "devDependencies": { 10 | "eslint": "^6.1.0", 11 | "eslint-plugin-flowtype": "^4.3.0", 12 | "eslint-plugin-import": "2.17.2", 13 | "eslint-plugin-jsx-a11y": "^6.2.3", 14 | "eslint-plugin-react": "7.12.4", 15 | "eslint-plugin-react-hooks": "^2.0.1" 16 | } 17 | } 18 | -------------------------------------------------------------------------------- /server/.eslintrc.js: -------------------------------------------------------------------------------- 1 | module.exports = { 2 | "env": { 3 | "node": true, 4 | "commonjs": true, 5 | "es6": true, 6 | "mocha": true 7 | }, 8 | "extends": "eslint:recommended", 9 | "parserOptions": { 10 | "sourceType": "module", 11 | "ecmaVersion": 2018 12 | }, 13 | "rules": { 14 | "indent": [ 15 | "error", 16 | "tab", 17 | { "SwitchCase": 1 } 18 | ], 19 | "linebreak-style": [ 20 | "error", 21 | "unix" 22 | ], 23 | "quotes": [ 24 | "error", 25 | "single" 26 | ], 27 | "semi": [ 28 | "error", 29 | "never" 30 | ], 31 | "no-console": "error", 32 | } 33 | }; 34 | -------------------------------------------------------------------------------- /server/README.md: -------------------------------------------------------------------------------- 1 | ## Offline development 2 | 1. You should have Java Runtime Engine (JRE) version 6.x or newer for serverless-dynamodb-local to run 3 | 2. Run `npm start` 4 | 5 | ## Deployment 6 | 1. You should have AWS CLI set up with access key 7 | 2. Run `npm deploy` 8 | -------------------------------------------------------------------------------- /server/package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "server", 3 | "version": "1.0.0", 4 | "main": "handler.js", 5 | "scripts": { 6 | "test": "echo \"Error: no test specified\" && exit 1", 7 | "postinstall": "sls dynamodb install", 8 | "start": "sls dynamodb start & sls offline", 9 | "deploy": "sls deploy" 10 | }, 11 | "dependencies": { 12 | "apollo-server-lambda": "^2.14.2", 13 | "graphql": "^14.3.0", 14 | "graphql-subscriptions": "^1.1.0", 15 | "uuid": "^3.3.3" 16 | }, 17 | "devDependencies": { 18 | "@babel/core": "^7.6.0", 19 | "@babel/preset-env": "^7.6.0", 20 | "aws-sdk": "^2.814.0", 21 | "babel-loader": "^8.0.6", 22 | "babel-plugin-source-map-support": "^2.1.1", 23 | "clean-terminal-webpack-plugin": "^2.0.5", 24 | "friendly-errors-webpack-plugin": "^1.7.0", 25 | "serverless-dynamodb-local": "^0.2.38", 26 | "serverless-offline": "^5.10.1", 27 | "serverless-webpack": "^5.3.1", 28 | "webpack": "^4.39.1", 29 | "webpack-node-externals": "^1.7.2" 30 | } 31 | } 32 | -------------------------------------------------------------------------------- /server/serverless.yml: -------------------------------------------------------------------------------- 1 | service: serverless-subscriptions 2 | 3 | plugins: 4 | - serverless-webpack 5 | - serverless-dynamodb-local 6 | - serverless-offline 7 | 8 | provider: 9 | name: aws 10 | runtime: nodejs8.10 11 | region: eu-west-1 12 | stage: ${opt:stage, 'dev'} 13 | environment: 14 | PUBLISH_ENDPOINT: !Join 15 | - '' 16 | - - 'https://' 17 | - !Ref WebsocketsApi 18 | - '.execute-api.${self:provider.region}.amazonaws.com/${self:provider.stage}/' 19 | TOPICS_TABLE: 'TOPIC_SUBSCRIBERS' 20 | EVENTS_TABLE: 'SUBSCRIPTION_EVENTS' 21 | 22 | 23 | 24 | package: 25 | individually: true 26 | 27 | custom: 28 | webpack: 29 | webpackConfig: 'webpack.config.js' 30 | includeModules: 31 | packagePath: './package.json' 32 | dynamodb: 33 | stages: 34 | - dev 35 | start: 36 | port: 8000 37 | inMemory: true 38 | heapInitial: 200m 39 | heapMax: 1g 40 | migrate: true 41 | convertEmptyValues: true 42 | 43 | 44 | functions: 45 | graphql: 46 | handler: src/graphql.handler 47 | role: role 48 | events: 49 | - http: 50 | path: graphql 51 | method: POST 52 | cors: 53 | origins: 54 | - '*' 55 | websocket: 56 | handler: src/websocket.handler 57 | role: role 58 | events: 59 | - websocket: 60 | route: $connect 61 | - websocket: 62 | route: $disconnect 63 | - websocket: 64 | route: $default 65 | publish: 66 | handler: src/publish.handler 67 | role: role 68 | events: 69 | - stream: 70 | type: dynamodb 71 | batchSize: 1 72 | startingPosition: LATEST 73 | arn: !GetAtt 74 | - subscriptionEventsTable 75 | - StreamArn 76 | 77 | resources: 78 | Resources: 79 | topicSubscribersTable: 80 | Type: AWS::DynamoDB::Table 81 | Properties: 82 | TableName: ${self:provider.environment.TOPICS_TABLE} 83 | ProvisionedThroughput: 84 | ReadCapacityUnits: 1 85 | WriteCapacityUnits: 1 86 | AttributeDefinitions: 87 | - AttributeName: topic 88 | AttributeType: S 89 | - AttributeName: connectionId 90 | AttributeType: S 91 | KeySchema: 92 | - AttributeName: topic 93 | KeyType: HASH 94 | - AttributeName: connectionId 95 | KeyType: RANGE 96 | TimeToLiveSpecification: 97 | AttributeName: 'ttl' 98 | Enabled: true 99 | GlobalSecondaryIndexes: 100 | - 101 | IndexName: reverse 102 | KeySchema: 103 | - AttributeName: connectionId 104 | KeyType: HASH 105 | - AttributeName: topic 106 | KeyType: RANGE 107 | Projection: 108 | ProjectionType: ALL 109 | ProvisionedThroughput: 110 | ReadCapacityUnits: 1 111 | WriteCapacityUnits: 1 112 | 113 | subscriptionEventsTable: 114 | Type: AWS::DynamoDB::Table 115 | Properties: 116 | TableName: ${self:provider.environment.EVENTS_TABLE} 117 | ProvisionedThroughput: 118 | ReadCapacityUnits: 1 119 | WriteCapacityUnits: 1 120 | AttributeDefinitions: 121 | - AttributeName: topic 122 | AttributeType: S 123 | - AttributeName: id 124 | AttributeType: S 125 | KeySchema: 126 | - AttributeName: topic 127 | KeyType: HASH 128 | - AttributeName: id 129 | KeyType: RANGE 130 | StreamSpecification: 131 | StreamViewType: NEW_IMAGE 132 | 133 | role: 134 | Type: 'AWS::IAM::Role' 135 | Properties: 136 | RoleName: ${self:service}-role 137 | AssumeRolePolicyDocument: 138 | Version: '2012-10-17' 139 | Statement: 140 | - Effect: Allow 141 | Principal: 142 | Service: 143 | - lambda.amazonaws.com 144 | Action: 'sts:AssumeRole' 145 | Policies: 146 | - PolicyName: logLambda 147 | PolicyDocument: 148 | Version: '2012-10-17' 149 | Statement: 150 | - Effect: Allow 151 | Action: 152 | - 'logs:CreateLogGroup' 153 | - 'logs:CreateLogStream' 154 | - 'logs:PutLogEvents' 155 | Resource: !Join 156 | - '' 157 | - - 'arn:aws:logs:${self:provider.region}:' 158 | - !Ref 'AWS::AccountId' 159 | - ':log-group:/aws/lambda/*:*:*' 160 | - PolicyName: useDynamoDb 161 | PolicyDocument: 162 | Version: '2012-10-17' 163 | Statement: 164 | - Effect: Allow 165 | Action: 166 | - 'dynamodb:GetItem' 167 | - 'dynamodb:PutItem' 168 | - 'dynamodb:BatchWriteItem' 169 | - 'dynamodb:Query' 170 | Resource: 171 | - !GetAtt subscriptionEventsTable.Arn 172 | - !GetAtt topicSubscribersTable.Arn 173 | - !Join 174 | - '' 175 | - - !GetAtt topicSubscribersTable.Arn 176 | - '/index/reverse' 177 | - PolicyName: accessDDBStream 178 | PolicyDocument: 179 | Version: '2012-10-17' 180 | Statement: 181 | - Effect: Allow 182 | Action: 183 | - dynamodb:DescribeStream 184 | - dynamodb:GetRecords 185 | - dynamodb:GetShardIterator 186 | - dynamodb:ListStreams 187 | Resource: !GetAtt subscriptionEventsTable.StreamArn 188 | - PolicyName: publishToConnectedClients 189 | PolicyDocument: 190 | Version: '2012-10-17' 191 | Statement: 192 | - Effect: Allow 193 | Action: 194 | - 'execute-api:Invoke' 195 | - 'execute-api:ManageConnections' 196 | Resource: !Join 197 | - '' 198 | - - 'arn:aws:execute-api:${self:provider.region}:' 199 | - !Ref 'AWS::AccountId' 200 | - ':' 201 | - !Ref WebsocketsApi 202 | - '/${self:provider.stage}/*' 203 | 204 | 205 | -------------------------------------------------------------------------------- /server/src/graphql.js: -------------------------------------------------------------------------------- 1 | import { makeExecutableSchema } from 'graphql-tools' 2 | import { ApolloServer, gql } from 'apollo-server-lambda' 3 | import publish from './utils/publish' 4 | import subscribe from './utils/subscribe' 5 | 6 | const typeDefs = gql` 7 | type Query { 8 | _: String 9 | } 10 | type Mutation { 11 | sendMessage(message: String!): String 12 | } 13 | type Subscription { 14 | listenMessage: String 15 | } 16 | ` 17 | 18 | const resolvers = { 19 | Mutation: { 20 | sendMessage: async (root, { message }) => { 21 | await publish('MY_TOPIC', { listenMessage: message }) 22 | return message 23 | } 24 | }, 25 | Subscription: { 26 | listenMessage: { 27 | subscribe: subscribe('MY_TOPIC') 28 | } 29 | } 30 | } 31 | 32 | export const schema = makeExecutableSchema({ 33 | typeDefs, 34 | resolvers, 35 | }) 36 | 37 | const server = new ApolloServer({ schema }) 38 | 39 | export const handler = server.createHandler({ 40 | cors: { 41 | origin: '*', 42 | credentials: true, 43 | } 44 | }) 45 | 46 | -------------------------------------------------------------------------------- /server/src/models/Client.js: -------------------------------------------------------------------------------- 1 | import ApiGatewayManagementApi from 'aws-sdk/clients/apigatewaymanagementapi' 2 | import client from '../utils/dynamodb' 3 | 4 | class Client { 5 | constructor(connectionId) { 6 | this.connectionId = connectionId 7 | } 8 | 9 | async get() { 10 | const { Item } = await client.get({ 11 | TableName: process.env.TOPICS_TABLE, 12 | Key: { 13 | connectionId: this.connectionId, 14 | topic: 'INITIAL_CONNECTION' 15 | } 16 | }).promise() 17 | return Item 18 | } 19 | 20 | async getTopics() { 21 | const { Items: topics } = await client.query({ 22 | ExpressionAttributeValues: { 23 | ':connectionId': this.connectionId 24 | }, 25 | IndexName: 'reverse', 26 | KeyConditionExpression: 'connectionId = :connectionId', 27 | ProjectionExpression: 'topic, connectionId', 28 | TableName: process.env.TOPICS_TABLE 29 | }).promise() 30 | return topics 31 | } 32 | 33 | async removeTopics(RequestItems) { 34 | const res = await client.batchWrite({ 35 | RequestItems 36 | }).promise() 37 | if(res.UnprocessedItems && res.UnprocessedItems.length) { 38 | return this.removeTopics(res.UnprocessedItems) 39 | } 40 | } 41 | 42 | async unsubscribe() { 43 | const topics = await this.getTopics() 44 | return this.removeTopics({ 45 | [process.env.TOPICS_TABLE]: topics.map(({ topic, connectionId }) => ({ 46 | DeleteRequest: { Key: { topic, connectionId } } 47 | })) 48 | }) 49 | } 50 | 51 | async sendMessage(message) { 52 | const gatewayClient = new ApiGatewayManagementApi({ 53 | apiVersion: '2018-11-29', 54 | endpoint: process.env.IS_OFFLINE ? 'http://localhost:3001' : process.env.PUBLISH_ENDPOINT 55 | }) 56 | return gatewayClient.postToConnection({ 57 | ConnectionId: this.connectionId, 58 | Data: JSON.stringify(message) 59 | }).promise() 60 | } 61 | 62 | async subscribe({ topic, subscriptionId, ttl }) { 63 | return client.put({ 64 | Item: { 65 | topic, 66 | subscriptionId, 67 | connectionId: this.connectionId, 68 | ttl: typeof ttl === 'number' ? ttl : Math.floor(Date.now() / 1000) + 60 * 60 * 2, 69 | }, 70 | TableName: process.env.TOPICS_TABLE 71 | }).promise() 72 | } 73 | 74 | async connect() { 75 | return this.subscribe({ 76 | topic: 'INITIAL_CONNECTION' 77 | }) 78 | } 79 | } 80 | 81 | export default Client 82 | -------------------------------------------------------------------------------- /server/src/models/Topic.js: -------------------------------------------------------------------------------- 1 | import uuid from 'uuid' 2 | import client from '../utils/dynamodb' 3 | import { handler as publish } from '../publish' 4 | import Client from './Client' 5 | 6 | class Topic { 7 | constructor(topic) { 8 | this.topic = topic 9 | } 10 | 11 | async getSubscribers() { 12 | const { Items: clients } = await client.query({ 13 | ExpressionAttributeValues: { 14 | ':topic': this.topic 15 | }, 16 | KeyConditionExpression: 'topic = :topic', 17 | ProjectionExpression: 'connectionId, subscriptionId', 18 | TableName: process.env.TOPICS_TABLE 19 | }).promise() 20 | return clients 21 | } 22 | 23 | async publishMessage(data) { 24 | const subscribers = await this.getSubscribers() 25 | const promises = subscribers.map(async ({ connectionId, subscriptionId }) => { 26 | const TopicSubscriber = new Client(connectionId) 27 | try { 28 | const res = await TopicSubscriber.sendMessage({ 29 | id: subscriptionId, 30 | payload: { data }, 31 | type: 'data' 32 | }) 33 | return res 34 | } catch(err) { 35 | if(err.statusCode === 410) { // this client has disconnected unsubscribe it 36 | return TopicSubscriber.unsubscribe() 37 | } 38 | } 39 | }) 40 | return Promise.all(promises) 41 | } 42 | 43 | async postMessage(data) { 44 | const payload = { 45 | data, 46 | topic: this.topic, 47 | id: uuid.v4(), 48 | } 49 | if(process.env.IS_OFFLINE) { // dynamodb streams are not working offline so invoke lambda directly 50 | await publish({ 51 | Records: [{ 52 | eventName: 'INSERT', 53 | dynamodb: { 54 | NewImage: payload 55 | } 56 | }] 57 | }) 58 | } 59 | return client.put({ 60 | Item: payload, 61 | TableName: process.env.EVENTS_TABLE 62 | }).promise() 63 | } 64 | } 65 | 66 | export default Topic 67 | -------------------------------------------------------------------------------- /server/src/publish.js: -------------------------------------------------------------------------------- 1 | import DynamoDB from 'aws-sdk/clients/dynamodb' 2 | import Topic from './models/Topic' 3 | const parseNewEvent = DynamoDB.Converter.unmarshall 4 | 5 | export async function handler(event) { 6 | const subscruptionEvent = event.Records[0] 7 | if(subscruptionEvent.eventName !== 'INSERT') { 8 | throw new Error('Invalid event. Wrong dynamodb event type, can publish only `INSERT` events to subscribers.') 9 | } 10 | const { topic, data } = process.env.IS_OFFLINE ? 11 | subscruptionEvent.dynamodb.NewImage : 12 | parseNewEvent(subscruptionEvent.dynamodb.NewImage) 13 | return new Topic(topic).publishMessage(data) 14 | } 15 | -------------------------------------------------------------------------------- /server/src/utils/dynamodb.js: -------------------------------------------------------------------------------- 1 | import DynamoDB from 'aws-sdk/clients/dynamodb' 2 | 3 | const localConfig = { 4 | region: 'localhost', 5 | endpoint: 'http://localhost:8000', 6 | accessKeyId: 'DEFAULT_ACCESS_KEY', 7 | secretAccessKey: 'DEFAULT_SECRET' 8 | } 9 | 10 | const remoteConfig = { 11 | region: process.env.AWS_REGION 12 | } 13 | 14 | const client = new DynamoDB.DocumentClient(process.env.IS_OFFLINE ? localConfig : remoteConfig) 15 | export default client 16 | -------------------------------------------------------------------------------- /server/src/utils/publish.js: -------------------------------------------------------------------------------- 1 | import Topic from '../models/Topic' 2 | 3 | const publish = (topic, data) => { 4 | return new Topic(topic).postMessage(data) 5 | } 6 | 7 | export default publish 8 | -------------------------------------------------------------------------------- /server/src/utils/subscribe.js: -------------------------------------------------------------------------------- 1 | import Client from '../models/Client' 2 | import { PubSub } from 'graphql-subscriptions' 3 | 4 | const subscribeResolver = topic => async ({ id }, args, { connectionId, ttl }) => { 5 | await new Client(connectionId).subscribe({ 6 | ttl, 7 | topic, 8 | subscriptionId: id 9 | }) 10 | return new PubSub().asyncIterator([topic]) 11 | } 12 | 13 | export default subscribeResolver 14 | -------------------------------------------------------------------------------- /server/src/websocket.js: -------------------------------------------------------------------------------- 1 | import { schema } from './graphql' 2 | import { parse, getOperationAST, validate, subscribe } from 'graphql' 3 | import Client from './models/Client' 4 | 5 | export async function handler(event) { 6 | if (!(event.requestContext && event.requestContext.connectionId)) { 7 | throw new Error('Invalid event. Missing `connectionId` parameter.') 8 | } 9 | 10 | const connectionId = event.requestContext.connectionId 11 | const route = event.requestContext.routeKey 12 | const Subscriber = new Client(connectionId) 13 | const response = { statusCode: 200, body: '' } 14 | 15 | if(route === '$connect') { 16 | await new Client(connectionId).connect() 17 | return response 18 | } else if(route === '$disconnect') { 19 | await new Client(connectionId).unsubscribe() 20 | return response 21 | } else { 22 | if (!event.body) { 23 | return response 24 | } 25 | 26 | let operation = JSON.parse(event.body) 27 | 28 | if(operation.type === 'connection_init') { 29 | await Subscriber.sendMessage({ type: 'connection_ack' }) 30 | return response 31 | } 32 | 33 | if(operation.type === 'stop') { 34 | return response 35 | } 36 | const client = await Subscriber.get() 37 | if(!client) { 38 | throw new Error('Unknown client') 39 | } 40 | 41 | const { query: rawQuery, variables, operationName } = operation.payload 42 | const graphqlDocument = parse(rawQuery) 43 | const operationAST = getOperationAST(graphqlDocument, operation.operationName || '') 44 | 45 | if(!operationAST || operationAST.operation !== 'subscription') { 46 | await Subscriber.sendMessage({ 47 | payload: { message: 'Only subscriptions are supported' }, 48 | type: 'error' 49 | }) 50 | return response 51 | } 52 | 53 | const validationErrors = validate(schema, graphqlDocument) 54 | if(validationErrors.length > 0) { 55 | await Subscriber.sendMessage({ 56 | payload: { errors: validationErrors }, 57 | type: 'error' 58 | }) 59 | return response 60 | } 61 | 62 | try { 63 | await subscribe({ 64 | document: graphqlDocument, 65 | schema, 66 | rootValue: operation, 67 | operationName: operationName, 68 | variableValues: variables, 69 | contextValue: { 70 | connectionId, 71 | ttl: client.ttl 72 | } 73 | }) 74 | } catch(err) { 75 | await Subscriber.sendMessage({ 76 | id: operation.id, 77 | payload: err, 78 | type: 'error' 79 | }) 80 | } 81 | return response 82 | } 83 | } 84 | -------------------------------------------------------------------------------- /server/webpack.config.js: -------------------------------------------------------------------------------- 1 | const path = require('path') 2 | const slsw = require('serverless-webpack') 3 | const nodeExternals = require('webpack-node-externals') 4 | const CleanTerminalPlugin = require('clean-terminal-webpack-plugin') 5 | const FriendlyErrorsWebpackPlugin = require('friendly-errors-webpack-plugin') 6 | 7 | module.exports = (() => { 8 | return { 9 | entry: slsw.lib.entries, 10 | externals: [nodeExternals()], 11 | target: 'node', 12 | stats: 'minimal', 13 | mode: slsw.lib.webpack.isLocal ? 'development': 'production', 14 | optimization: { 15 | minimize: false 16 | }, 17 | performance: { 18 | hints: false 19 | }, 20 | resolve: { 21 | extensions: ['.js'] 22 | }, 23 | module: { 24 | rules: [ 25 | { 26 | test: /\.js$/, 27 | exclude: /node_modules/, 28 | use: { 29 | loader: 'babel-loader', 30 | } 31 | } 32 | ] 33 | }, 34 | output: { 35 | libraryTarget: 'commonjs', 36 | path: path.resolve(__dirname, '.webpack/'), 37 | filename: '[name].js', 38 | }, 39 | plugins: [ 40 | new CleanTerminalPlugin(), 41 | new FriendlyErrorsWebpackPlugin(), 42 | ] 43 | } 44 | })() 45 | -------------------------------------------------------------------------------- /showtime.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/AlpacaGoesCrazy/serverless-graphql-subscriptions/d0218f6f6ec15492c52fd79972fe928dab89acd3/showtime.gif --------------------------------------------------------------------------------