Initial commit

.gitignore

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+// compiled binaries
+*.deno
+*.exe

.vscode/settings.json

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+{
+  "deno.enable": true,
+  "deno.lint": true,
+  "deno.codeLens.implementations": true,
+  "deno.codeLens.references": true,
+  "deno.codeLens.referencesAllFunctions": true
+}

server.deno.ts

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+import {
+  WebSocketServer
+} from "https://deno.land/x/websocket@v0.1.3/mod.ts";
+
+const port = 8989;
+const timeout = 15000;
+
+const server = new WebSocketServer(port);
+
+console.log("listening on port: " + port);
+
+function ackPkg() {
+  return JSON.stringify({
+    type: "ack",
+    date: Date.now(),
+  });
+}
+
+server.on("connection", function connection(socket) {
+  function close() {
+    socket.send("closing connection due to inactivity");
+    socket.close();
+  }
+
+  socket.on("message", function (message: string) {
+    console.log("message: " + message);
+    socket.send(
+      JSON.stringify({
+        date: Date.now(),
+        author: "ECHO Service",
+        content: message,
+      })
+    );
+    clearTimeout(closeTimeout);
+    closeTimeout = setTimeout(close, timeout);
+  });
+  socket.on("close", function close() {
+    console.log("closed a connection");
+  });
+
+  console.log("new client connected!");
+  socket.send("connected");
+  let closeTimeout = setTimeout(close, timeout);
+});