def get(self,
flip_horizontal,
width,
flip_vertical,
height,
halign,
valign,
url):
url = self.validate_url(url)
width = width and int(width) or 0
height = height and int(height) or 0
if width > MAX_WIDTH:
width = MAX_WIDTH
if height > MAX_HEIGHT:
height = MAX_HEIGHT
if not halign:
halign = "center"
if not valign:
valign = "middle"
key = "%d_%d_%s_%s_%s" % (
width,
height,
halign,
valign,
url
)
extension = splitext(url)[-1]
image_format = extension in ('.jpg', '.jpeg') and JPEG or PNG
data = memcache.get(key)
self.response.headers['Cache-Key'] = key
if data is not None:
results = data
self.response.headers['Cache-Hit'] = 'True'
else:
query = "SELECT * FROM Picture WHERE url = :1 LIMIT 1"
pictures = db.GqlQuery(query, url).fetch(1)
try:
if len(pictures) > 0:
picture = pictures[0]
if picture.is_expired():
img = picture.fetch_image()
try:
picture.put()
except RequestTooLargeError:
picture.rebalance_picture_size(self.transform)
picture.put()
else:
img = Image(picture.picture)
else:
picture = Picture()
picture.url = url
img = picture.fetch_image()
try:
picture.put()
except RequestTooLargeError:
picture.rebalance_picture_size(self.transform)
picture.put()
except ImageNotFoundError:
self._error(404, 'Your image source is not found!')
return
results = self.transform(img, width, flip_horizontal, height, flip_vertical, image_format, halign, valign)
memcache.set(key=key,
value=results,
time=EXPIRATION) # ONE MONTH
self.response.headers['Cache-Hit'] = 'False'
self.response.headers['Content-Type'] = image_format == JPEG and 'image/jpeg' or 'image/png'
self.response.out.write(results)
