Source for Go websockets app that is deployed with Terraform

webapp/.gitignore

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+rice-box.go
+dist/*

webapp/README.md

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+# Web app
+
+A web app written in Go that uses websockets to log visits and push notifications to all visitors.
+
+Defaults to running on port 80. Set `PORT` as ENV var to specify another port.
+
+### Build
+
+Build for Linux and Darwin:
+
+    ./bin/build
+
+Output can be found in `dist`.
+
+A copy of the Linux executable will also be copied to `../assets` for deployment with Terraform.
+
+### Run
+
+    PORT=8080 go run main.go
+
+### View
+
+    http://localhost:8080
+
+## Credits
+
+Browser icons from https://github.com/alrra/browser-logos
+
+

webapp/assets/app.js

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+var data = [{ date: new Date(), value: 1 }];
+var ids = {};
+
+const windowWidth = $(window).width();
+function renderChart(data) {
+  MG.data_graphic({
+    title: "Visits",
+    description: "This graphic shows a time series of page views.",
+    data: data,
+    width: windowWidth < 800 ? windowWidth - 40 : 700,
+    height: windowWidth < 800 ? 150 : 250,
+    chart_type: "histogram",
+    bins: 30,
+    bar_margin: 0,
+    target: "#chart",
+    x_accessor: "date",
+    y_accessor: "value"
+  });
+}
+
+renderChart(data);
+
+function addTableRow(record) {
+  // {browser:"firefox", epochs:39929283829, ip:"10.0.0.1", agent:"Chrome 238.23"}
+  $("#visits tbody").prepend(
+    '<tr><td><img src="images/128/' +
+      record.browser +
+      '_128x128.png"></td><td>' +
+      '<div class="metadata"><span class="time">' +
+      moment(record.epochs).format("LT") +
+      "</span></div>" +
+      '<div class="agent">' +
+      record.agent +
+      "</div>" +
+      "</td></tr>"
+  );
+}
+
+function logVisit(record) {
+  if (ids[record.id] === undefined) {
+    record.date = new Date(record.epochs);
+    data.push(record);
+    renderChart(data);
+    addTableRow(record);
+    ids[record.id] = 1;
+  }
+}
+
+var socket = io({ transports: ["websocket"] });
+
+// Listen for messages
+socket.on("message", function(message) {
+  logVisit(message);
+});
+
+socket.on("connect", function() {
+  // Broadcast a message
+  var message = {};
+  const epochs = new Date().getTime();
+
+  function broadcastMessage() {
+    message.epochs = new Date().getTime();
+    message.id = message.epochs;
+    socket.emit("send", message, function(result) {
+      // Silent success
+    });
+  }
+
+  message = {
+    id: epochs,
+    browser: navigator.appName.toLowerCase(),
+    epochs: epochs,
+    agent: navigator.userAgent,
+    value: 1
+  };
+  broadcastMessage();
+
+  setInterval(broadcastMessage, 30 * 1000);
+});