create websocket cache 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

README.md

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+# websocket-http-cache
+
+To install dependencies:
+
+```bash
+bun install
+```
+
+To run:
+
+```bash
+bun run index.ts
+```
+
+This project was created using `bun init` in bun v1.1.29. [Bun](https://bun.sh) is a fast all-in-one JavaScript runtime.

package.json

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+{
+  "name": "websocket-http-cache",
+  "module": "src/server.ts",
+  "type": "module",
+  "devDependencies": {
+    "@types/bun": "latest"
+  },
+  "peerDependencies": {
+    "typescript": "^5.0.0"
+  },
+  "dependencies": {
+    "hono": "^4.6.3"
+  }
+}

src/WebSocketLifeCycle.ts

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+
+export class WebSocketLifecycle {
+  cachedValue: string = "";
+  reconnectTimer?: Timer;
+
+  socket?: WebSocket;
+  readonly socketUrl: string;
+  readonly name: string;
+
+  private messages: string[];
+  
+  constructor(socketUrl: string, name: string) {
+    this.name = name;
+    this.socketUrl = socketUrl;
+    this.messages = [""];
+  }
+
+  public registerWebSocketHandler() {
+    this.socket = new WebSocket(this.socketUrl);
+
+    // message is received
+    this.socket.addEventListener("message", event => {
+      console.log(`WS: ${this.socketUrl} got message`, event)
+      this.messages = [event.data];
+    });
+
+    // socket opened
+    this.socket.addEventListener("open", event => {
+      console.log(`WS: ${this.socketUrl} opened`);
+
+      if (this.reconnectTimer) {
+        console.log(`WS: ${this.socketUrl} cancelling reconnect timer`)
+        clearInterval(this.reconnectTimer);
+        this.reconnectTimer = undefined;
+      }
+    });
+
+    // socket closed
+    this.socket.addEventListener("close", event => {
+      console.log(`WS: ${this.socketUrl} closed`);
+      if (!this.reconnectTimer) {
+        console.log(`WS: ${this.socketUrl} scheduling reconnect every 5s`);
+        this.reconnectTimer = setInterval(() => {
+          console.log(`WS: ${this.socketUrl} trying to reconnect`);
+          this.registerWebSocketHandler();
+        }, 5000);
+      }
+    });
+
+    // error handler
+    this.socket.addEventListener("error", event => {
+      console.error(`WS: ${this.socketUrl} error: `, event);
+    });
+  }
+
+  public getLatestMessage(): any {
+    return JSON.parse(this.messages[0]);
+  }
+}

src/WebhookServer.ts

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+import { Hono } from "hono";
+import { prettyJSON } from "hono/pretty-json";
+import { serve } from "bun";
+import type { WebSocketLifecycle } from "./WebSocketLifeCycle";
+
+export class WebhookServer {
+  readonly app: Hono;
+  readonly websockets: WebSocketLifecycle[];
+
+  constructor(websockets: WebSocketLifecycle[]) {
+    this.websockets = websockets;
+    this.app = new Hono();
+
+    this.app.use(prettyJSON());
+
+    this.app.get(`/api/:wsName`, async (c) => {
+      const wsName = c.req.param('wsName');
+
+      const webSocket = this.websockets.find(ws => ws.name === wsName);
+
+      if (!webSocket) {
+        return c.json({
+          err: "unknown websocket",
+        }, 404);
+      }
+
+      return c.json(webSocket.getLatestMessage(), 200);
+    });
+  }
+
+  listen(port: number) {
+    return serve({
+      fetch: this.app.fetch,
+      port,
+    });
+  }
+}

src/server.ts

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+import { WebhookServer } from "./WebhookServer";
+import { WebSocketLifecycle } from "./WebSocketLifeCycle";
+
+const socket = new WebSocketLifecycle("wss://ntfy.chromart.cc/buzzer/ws", "buzzer");
+socket.registerWebSocketHandler();
+
+const wsServer = new WebhookServer([socket]);
+wsServer.listen(8080);

tsconfig.json

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+{
+  "compilerOptions": {
+    // Enable latest features
+    "lib": ["ESNext", "DOM"],
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleDetection": "force",
+    "jsx": "react-jsx",
+    "allowJs": true,
+
+    // Bundler mode
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "noEmit": true,
+
+    // Best practices
+    "strict": true,
+    "skipLibCheck": true,
+    "noFallthroughCasesInSwitch": true,
+
+    // Some stricter flags (disabled by default)
+    "noUnusedLocals": false,
+    "noUnusedParameters": false,
+    "noPropertyAccessFromIndexSignature": false
+  }
+}