Set up server to relay ripples and presence info

server/.gitignore

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+# Based on https://raw.githubusercontent.com/github/gitignore/main/Node.gitignore
+
+# Logs
+
+logs
+_.log
+npm-debug.log_
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Caches 
+
+.cache
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+
+report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
+
+# Runtime data
+
+pids
+_.pid
+_.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+
+lib-cov
+
+# Coverage directory used by tools like istanbul
+
+coverage
+*.lcov
+
+# nyc test coverage
+
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+
+bower_components
+
+# node-waf configuration
+
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+
+build/Release
+
+# Dependency directories
+
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+
+web_modules/
+
+# TypeScript cache
+
+*.tsbuildinfo
+
+# Optional npm cache directory
+
+.npm
+
+# Optional eslint cache
+
+.eslintcache
+
+# Optional stylelint cache
+
+.stylelintcache
+
+# Microbundle cache
+
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+
+.node_repl_history
+
+# Output of 'npm pack'
+
+*.tgz
+
+# Yarn Integrity file
+
+.yarn-integrity
+
+# dotenv environment variable files
+
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+
+.parcel-cache
+
+# Next.js build output
+
+.next
+out
+
+# Nuxt.js build / generate output
+
+.nuxt
+dist
+
+# Gatsby files
+
+# Comment in the public line in if your project uses Gatsby and not Next.js
+
+# https://nextjs.org/blog/next-9-1#public-directory-support
+
+# public
+
+# vuepress build output
+
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+
+.temp
+
+# Docusaurus cache and generated files
+
+.docusaurus
+
+# Serverless directories
+
+.serverless/
+
+# FuseBox cache
+
+.fusebox/
+
+# DynamoDB Local files
+
+.dynamodb/
+
+# TernJS port file
+
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+
+.vscode-test
+
+# yarn v2
+
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*
+
+# IntelliJ based IDEs
+.idea
+
+# Finder (MacOS) folder config
+.DS_Store

server/README.md

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+# @compost.party/pond-server
+
+To install dependencies:
+
+```bash
+bun install
+```
+
+To run:
+
+```bash
+bun run index.ts
+```
+
+This project was created using `bun init` in bun v1.0.24. [Bun](https://bun.sh) is a fast all-in-one JavaScript runtime.

server/index.ts

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+import { type ServerWebSocket } from "bun"
+
+type WebsocketData = {
+  clientId: string
+}
+
+type Message =
+  | { type: 'presence-information', others: number }
+  | { type: 'ripple', position: [number, number], maxRadius: number }
+
+const clients: Map<WebsocketData['clientId'], ServerWebSocket<WebsocketData>> = new Map()
+
+const server = Bun.serve<WebsocketData>({
+  fetch(req, server) {
+    // TODO Allow creating private ponds
+    server.upgrade(req, {
+      data: {
+        clientId: crypto.randomUUID()
+      }
+    })
+  },
+  websocket: {
+    open(ws) {
+      // register newly connected client and tell them how many other people are there
+      console.log('Connection opened', ws.data.clientId)
+      clients.set(ws.data.clientId, ws)
+      const enterNotice = JSON.stringify(<Message>{
+        type: 'presence-information',
+        others: clients.size,
+      })
+      for (const [uuid, client] of clients.entries()) {
+        if (uuid !== ws.data.clientId) {
+          client.send(enterNotice, true)
+        }
+      }
+    },
+    message(ws, message) {
+      // broadcast message to all other clients
+      // TODO: Validate message shape
+      const msg = JSON.parse(`${message}`)
+      console.log('Relaying message from', ws.data.clientId, msg)
+      for (const [uuid, client] of clients.entries()) {
+        if (uuid !== ws.data.clientId) {
+          client.send(message)
+        }
+      }
+    },
+    close(ws, code, reason) {
+      // remove client from list of registered clients and tell other clients how many people are there
+      console.log('Connection closed', ws.data.clientId)
+      clients.delete(ws.data.clientId)
+      const leaveNotice = JSON.stringify(<Message>{
+        type: 'presence-information',
+        others: clients.size,
+      })
+      for (const [uuid, client] of clients.entries()) {
+        if (uuid !== ws.data.clientId) {
+          client.send(leaveNotice, true)
+        }
+      }
+    }
+  },
+})
+
+console.log(`Server running on ${server.hostname}:${server.port}`)

server/package.json

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+{
+  "name": "@compost.party/pond-server",
+  "module": "index.ts",
+  "type": "module",
+  "devDependencies": {
+    "@types/bun": "latest"
+  },
+  "peerDependencies": {
+    "typescript": "^5.0.0"
+  }
+}

server/tsconfig.json

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+{
+  "compilerOptions": {
+    "lib": ["ESNext"],
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleDetection": "force",
+    "jsx": "react-jsx",
+    "allowJs": true,
+
+    /* Bundler mode */
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "noEmit": true,
+
+    /* Linting */
+    "skipLibCheck": true,
+    "strict": true,
+    "noFallthroughCasesInSwitch": true,
+    "forceConsistentCasingInFileNames": true
+  }
+}