WebSocketHandler Demo

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WebSocketHandler Demo

\n\t

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{\n const PORT = 8000;\n\n function WebSocketHandler(opt) {\n this.opt = opt || {};\n this.isBrowser = typeof window !== \"undefined\";\n this.ws = null;\n this.simulated = false;\n this.connected = false;\n this.reconnectTimer = null;\n this.PORT = PORT;\n this.retryInterval = 3000;\n }\n\n WebSocketHandler.prototype._notifyStatus = function() {\n this.opt.onStatusChange && this.opt.onStatusChange({\n connected: this.connected,\n simulated: this.simulated,\n });\n };\n\n WebSocketHandler.prototype.connect = function() {\n if (!this.isBrowser) return;\n\n try {\n this._connectRealWS();\n } catch (e) {\n this._startFallback();\n this._scheduleReconnect();\n }\n };\n\n WebSocketHandler.prototype._connectRealWS = function() {\n const self = this;\n this.ws = new WebSocket(`ws://localhost:${this.PORT}`);\n\n this.ws.addEventListener(\"open\", () => {\n self.connected = true;\n self.simulated = false;\n self._notifyStatus();\n\n if (self.reconnectTimer) {\n clearTimeout(self.reconnectTimer);\n self.reconnectTimer = null;\n }\n\n self.opt.onMessage && self.opt.onMessage(\"✔️ Connected via real WebSocket server\");\n self.ws.send(\"Hello from browser\");\n });\n\n this.ws.addEventListener(\"message\", (e) => {\n self.opt.onMessage && self.opt.onMessage(\"Server says: \" + e.data);\n });\n\n this.ws.addEventListener(\"error\", () => {\n if (!self.simulated) {\n self.opt.onMessage && self.opt.onMessage(\"❌ WebSocket error, entering simulated mode\");\n self._startFallback();\n }\n self._scheduleReconnect();\n });\n\n this.ws.addEventListener(\"close\", () => {\n self.connected = false;\n self._notifyStatus();\n self.opt.onMessage && self.opt.onMessage(\"🔌 Disconnected, retrying in \" + (self.retryInterval / 1000) + \"s...\");\n if (!self.simulated) self._startFallback();\n self._scheduleReconnect();\n });\n };\n\n WebSocketHandler.prototype._startFallback = function() {\n if (!this.simulated) {\n this.simulated = true;\n this.connected = true;\n this._notifyStatus();\n this.opt.onMessage && this.opt.onMessage(\"⚠️ Fallback: connected via simulated WebSocket\");\n }\n };\n\n WebSocketHandler.prototype._scheduleReconnect = function() {\n const self = this;\n if (this.reconnectTimer) return;\n\n this.reconnectTimer = setTimeout(() => {\n self.reconnectTimer = null;\n self.opt.onMessage && self.opt.onMessage(\"🔁 Attempting to reconnect...\");\n self.connect();\n }, this.retryInterval);\n };\n\n WebSocketHandler.prototype.send = function(msg) {\n if (this.connected && !this.simulated && this.ws && this.ws.readyState === WebSocket.OPEN) {\n this.ws.send(msg);\n } else if (this.simulated) {\n setTimeout(() => {\n this.opt.onMessage && this.opt.onMessage(\"💬 Simulated echo: \" + msg);\n }, 100);\n }\n };\n\n g.WebSocketHandler = WebSocketHandler;\n\n // Server-side code (for Deno)\n if (typeof Deno !== \"undefined\" && typeof Deno.serve === \"function\") {\n Deno.serve({ port: PORT }, (req) => {\n if 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Diff · v18