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app/server.js

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+// Functionality dealing with server-level things
+
+var maxScrollback = 500;
+
+function Server(baseURL, network, authtok, messageHandler) {
+  function handleEventSourceLine(line) {
+    var lhs = line.split(" :", 1)[0]
+  	var parts = lhs.split(' ')
+  	var timestamp = new Date(parts[0] * 1000);
+    var fullSender = parts[1];
+  	var command = parts[2];
+  	var sender = parts[3];
+  	var forum = parts[4];
+  	var args = parts.slice(5);
+  	var txt = line.substr(lhs.length + 2);
+
+  	messageHandler(timestamp, fullSender, command, sender, forum, args, txt);
+  }
+
+  function handleEventSourceMessage(oEvent) {
+    msgs = oEvent.data.split("\n");
+
+    var first = Math.min(0, msgs.length - maxScrollback);
+    for (var i = first; i < msgs.length; i += 1) {
+      handleEeventSourceLine(msgs[i]);
+    }
+  }
+
+  function handleEventSourceError(oEvent) {
+    timestamp = new Date();
+    messageHandler(timestamp, null, "ERROR", null, null, [], null);
+  }
+
+  var pullURL = baseURL + "?network=" + encodeURIComponent(network) + "&authtok=" + encodeURIComponent(authtok);
+  this.eventSource = new EventSource(baseURL);
+  this.eventSource.addEventListener("message", handleEventSourceMessage);
+  this.eventSource.addEventListener("error", handleEventSourceError);
+}