keep-alive pings urls like heroku apps to keep them from sleeping

src/scripts/keep-alive.coffee

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+# keep-alive pings each url in the array every minute.
+# This is specifically to keep certain heroku apps from going to sleep
+#
+# keep `http://ninjas-20.herokuapp.com` alive - Add inputted url to the collection of urls set to be pinged
+# keep `http://ninjas-20.herokuapp.com` alive - Remove inputted url to the collection of urls set to be pinged
+# what are you keeping alive - Show list of urls being kept alive
+
+
+HTTP = require "http"
+URL  = require "url"
+
+frequency = 60000
+
+ping = (url) ->
+  parsedUrl = URL.parse(url)
+  options   =
+    host: parsedUrl.host
+    port: 80
+    path: '/'
+    method: 'GET'
+
+  req = HTTP.request options, (res) ->
+    body = ""
+    res.setEncoding("utf8")
+    res.on "data", (chunk) ->
+      body += chunk
+    res.on "end", () ->
+      data =
+        response:
+          body: body
+          status: res.statusCode
+
+  req.on "error", (e) ->
+
+  req.end()
+
+
+module.exports = (robot) ->
+
+  keepAlive = () ->
+    robot.brain.data.keepalives ?= []
+
+    for url in robot.brain.data.keepalives
+      console.log(url)
+      try
+        ping(url)
+      catch e
+        console.log("that probably isn't a url: " + url)
+
+    setTimeout (->
+      keepAlive()
+    ), frequency
+
+  keepAlive()
+
+  robot.respond /keep (.*) alive$/i, (msg) ->
+    url = msg.match[1]
+
+    robot.brain.data.keepalives ?= []
+
+    if url in robot.brain.data.keepalives
+      msg.send "I already am."
+    else
+      robot.brain.data.keepalives.push url
+      msg.send "OK. I'll ping that url every " + frequency/1000 + " seconds to make sure its alive."
+
+  robot.respond /don'?t keep (.*) alive$/i, (msg) ->
+    url = msg.match[1]
+
+    robot.brain.data.keepalives ?= []
+    robot.brain.data.keepalives.pop url
+    msg.send "OK. I've removed that url from my list of urls to keep alive."
+
+  robot.respond /what are you keeping alive/i, (msg) ->
+    robot.brain.data.keepalives ?= []
+
+    if robot.brain.data.keepalives.length > 0
+      msg.send "These are the urls I'm keeping alive\n\n" + robot.brain.data.keepalives.join('\n')
+    else
+      msg.send "i'm not currently keeping any urls alive. Why don't you add one."
+
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