webapp/handlers_iuse.py

   1 #!/usr/bin/python
   2
   3 import logging
   4 import os
   5 import random
   6 import tornado.web
   7
   8 from handlers_base import *
   9 import backend
  10
  11 class IUseImage(BaseHandler):
  12         @property
  13         def iuse(self):
  14                 return backend.IUse()
  15
  16         @property
  17         def stasy(self):
  18                 return backend.Stasy()
  19
  20         def get_error_html(self, status_code, **kwargs):
  21                 """
  22                         Select a random image from the errors directory
  23                         and return the content.
  24                 """
  25                 self.set_header("Content-Type", "image/png")
  26
  27                 template_path = self.application.settings.get("template_path", "")
  28                 template_path = os.path.join(template_path, "i-use", "errors")
  29
  30                 images = os.listdir(template_path)
  31                 if images:
  32                         image = random.choice(images)
  33                         image = os.path.join(template_path, image)
  34
  35                         with open(image, "rb") as f:
  36                                 return f.read()
  37
  38         def get(self, profile_id, image_id):
  39                 image = None
  40                 # Try to get the image from memcache. If we have a cache miss we
  41                 # build a new one.
  42                 mem_id = "iuse-%s-%s-%s" % (profile_id, image_id, self.locale.code)
  43
  44                 cache = self.get_argument("cache", "true")
  45                 if cache == "true":
  46                         image = self.memcached.get(mem_id)
  47
  48                 if image:
  49                         logging.debug("Got image from cache for profile: %s" % profile_id)
  50                 else:
  51                         logging.info("Rendering new image for profile: %s" % profile_id)
  52
  53                         image_cls = self.iuse.get_imagetype(image_id)
  54                         if not image_cls:
  55                                 raise tornado.web.HTTPError(404, "Image class is unknown: %s" % image_id)
  56
  57                         profile = self.stasy.get_profile(profile_id)
  58                         if not profile:
  59                                 raise tornado.web.HTTPError(404, "Profile '%s' was not found." % profile_id)
  60
  61                         # Render the image
  62                         image = image_cls(self, profile).to_string()
  63
  64                         # Save the image to the memcache for 15 minutes
  65                         self.memcached.set(mem_id, image, 15*60)
  66
  67                 self.set_header("Content-Type", "image/png")
  68                 self.write(image)
  69