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      1 # Copyright (C) 2009 Google Inc. All rights reserved.
      2 #
      3 # Redistribution and use in source and binary forms, with or without
      4 # modification, are permitted provided that the following conditions are
      5 # met:
      6 # 
      7 #     * Redistributions of source code must retain the above copyright
      8 # notice, this list of conditions and the following disclaimer.
      9 #     * Redistributions in binary form must reproduce the above
     10 # copyright notice, this list of conditions and the following disclaimer
     11 # in the documentation and/or other materials provided with the
     12 # distribution.
     13 #     * Neither the name of Google Inc. nor the names of its
     14 # contributors may be used to endorse or promote products derived from
     15 # this software without specific prior written permission.
     16 # 
     17 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     18 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     19 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     20 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     21 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     22 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     23 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     27 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28 
     29 import datetime
     30 
     31 from google.appengine.ext import webapp
     32 from google.appengine.ext.webapp import template
     33 
     34 from model.queues import Queue
     35 from model.queuestatus import QueueStatus
     36 from model.workitems import WorkItems
     37 
     38 
     39 class QueueBubble(object):
     40     """View support class for recentstatus.html"""
     41     def __init__(self, queue):
     42         self._queue = queue
     43         self._work_items = queue.work_items()
     44         self._last_status = QueueStatus.all().filter("queue_name =", queue.name()).order("-date").get()
     45 
     46     # FIXME: name and display_name should be replaced by a .queue() accessor.
     47     def name(self):
     48         return self._queue.name()
     49 
     50     def display_name(self):
     51         return self._queue.display_name()
     52 
     53     def _last_status_date(self):
     54         if not self._last_status:
     55             return None
     56         return self._last_status.date
     57 
     58     def last_heard_from(self):
     59         if not self._work_items:
     60             return self._last_status_date()
     61         return max(self._last_status_date(), self._work_items.date)
     62 
     63     def is_alive(self):
     64         if not self.last_heard_from():
     65             return False
     66         return self.last_heard_from() > (datetime.datetime.now() - datetime.timedelta(minutes=30))
     67 
     68     def status_class(self):
     69         if not self.is_alive():
     70             return "dead"
     71         if self.pending_items_count() > 1:
     72             return "behind"
     73         return "alive"
     74 
     75     def status_text(self):
     76         if not self._work_items:
     77             return "Offline"
     78         if not self._work_items.item_ids:
     79             return "Idle"
     80         return self._last_status.message
     81 
     82     def pending_items_count(self):
     83         if not self._work_items:
     84             return 0
     85         return len(self._work_items.item_ids)
     86 
     87 
     88 class QueuesOverview(webapp.RequestHandler):
     89 
     90     def get(self):
     91         template_values = {
     92             "queues": [QueueBubble(queue) for queue in Queue.all()],
     93         }
     94         self.response.out.write(template.render("templates/recentstatus.html", template_values))
     95