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