Add homu queue warning.

homu.js

@@ -0,0 +1,39 @@
+var request = require("request");
+
+function checkHomuQueue(cb) {
+    // First check if any buildbot builders report an ongoing build.
+    retrieveBuildbotBuilders(function(builders) {
+        var allIdle = true;
+        for (var builder in data) {
+            var builderData = data[builder];
+            if ('currentBuilds' in builderData && builderData['currentBuilds'].length) {
+                return;
+            }
+        }
+        // Next see if homu thinks that any PRs are ready to be built.
+        retrieveHomuQueue(function(body) {
+            var numApproved = (body.match(/<td class="approved">/g) || []).length;
+            if (numApproved) {
+                cb(numApproved);
+            }
+        });
+    })
+}
+
+function retrieveHomuQueue(cb) {
+    request("http://servo-master.servo.org:54856/queue/servo", function(err, response, body) {
+        if (!err && response.statusCode >= 200 && response.statusCode < 300) {
+            cb(body);
+        }
+    });
+}
+
+function retrieveBuildbotBuilders(cb) {
+    request("http://build.servo.org/json/builders/", function(err, response, body) {
+        if (!err && response.statusCode >= 200 && response.statusCode < 300) {
+            cb(JSON.parse(body));
+        }
+    });
+}
+
+exports.checkHomuQueue = checkHomuQueue;

server.js

@@ -6,7 +6,8 @@ var irc = require("irc"),
     newsflash = require("./newsflash"),
     opsreport = require("./opsreport"),
     graphs = require("./graphs"),
-    storage = require('node-persist');
+    storage = require('node-persist'),
+    homu = require("./homu");
 
 function githubRequest(endpoint, callback) {
   var reqParams = {
@@ -514,3 +515,11 @@ bot.addListener("message", handler);
 bot.addListener("action", handler);
 // Listener for the autopinger
 bot.addListener("join", pingResponder);
+
+const THIRTY_MINUTES = 30 * 60 * 1000;
+setInterval(function() {
+    checkHomuQueue(function(queued) {
+        bot.say(config.channels[0],
+                "Warning! All builders are idle, but there are " + queued + "PRs in the queue.");
+    });
+}, THIRTY_MINUTES);