| 30 |
30 |
template_vars.update({'statics_hash': statics_hash.hexdigest()})
|
| 31 |
31 |
return template_vars
|
| 32 |
32 |
|
|
33 |
|
| 33 |
34 |
class RemoteTemplate(object):
|
| 34 |
35 |
def __init__(self, source):
|
| 35 |
36 |
self.source = source
|
| 36 |
37 |
|
| 37 |
38 |
@property
|
| 38 |
39 |
def cache_key(self):
|
| 39 |
|
return hashlib.md5(urlparse.urlunparse(
|
| 40 |
|
urlparse.urlparse(self.source)[:3] + ('', '', ''))).hexdigest()
|
|
40 |
return hashlib.md5(urlparse.urlunparse(
|
|
41 |
urlparse.urlparse(self.source)[:3] + ('', '', ''))).hexdigest()
|
| 41 |
42 |
|
| 42 |
43 |
def get_template(self):
|
| 43 |
|
item = cache.get(self.cache_key)
|
| 44 |
|
if item is None:
|
|
44 |
x_combo_page_id = cache.get(self.cache_key)
|
|
45 |
if x_combo_page_id is None:
|
| 45 |
46 |
template_body = self.update_content()
|
| 46 |
47 |
if template_body is None:
|
| 47 |
48 |
raise Exception('Failed to retrieve theme')
|
| 48 |
49 |
else:
|
| 49 |
|
template_body, expiry_time = item
|
| 50 |
|
if expiry_time < datetime.datetime.now():
|
| 51 |
|
# stale value, put it back into the cache for other consumers and
|
| 52 |
|
# update the content in a different thread
|
| 53 |
|
self.cache(template_body)
|
| 54 |
|
threading.Thread(target=self.update_content).start()
|
|
50 |
combo_page_id, combo_page_id_expiry_time = x_combo_page_id
|
|
51 |
|
|
52 |
item = cache.get(self.combo_page_id_cache_key(combo_page_id))
|
|
53 |
if item is None:
|
|
54 |
template_body = self.update_content()
|
|
55 |
if template_body is None:
|
|
56 |
raise Exception('Failed to retrieve theme')
|
|
57 |
else:
|
|
58 |
template_body, expiry_time = item
|
|
59 |
if max(expiry_time, combo_page_id_expiry_time) < datetime.datetime.now():
|
|
60 |
# stale value, put it back into the cache for other consumers and
|
|
61 |
# update the content in a different thread
|
|
62 |
# we do not put the template body back in the cache as we do not know if this
|
|
63 |
# page is going to resolve to the same X-Combo-Page-Id for this update round
|
|
64 |
self.cache(template_body, update_combo_page_id_cache=False)
|
|
65 |
threading.Thread(target=self.update_content).start()
|
| 55 |
66 |
return Template(template_body)
|
| 56 |
67 |
|
| 57 |
68 |
def update_content(self):
|
| ... | ... | |
| 59 |
70 |
if r.status_code != 200:
|
| 60 |
71 |
logger.error('failed to retrieve theme')
|
| 61 |
72 |
return None
|
| 62 |
|
self.cache(r.text)
|
|
73 |
self.cache(r.headers['x-combo-page-id'], r.text)
|
| 63 |
74 |
return r.text
|
| 64 |
75 |
|
| 65 |
|
def cache(self, template_body):
|
|
76 |
def combo_page_id_cache_key(self, combo_page_id):
|
|
77 |
return hashlib.md5('combo-page-id-' + combo_page_id).hexdigest()
|
|
78 |
|
|
79 |
def cache(self, combo_page_id, template_body, update_combo_page_id_cache=True):
|
| 66 |
80 |
expiry_time = datetime.datetime.now() + datetime.timedelta(seconds=CACHE_REFRESH_TIMEOUT)
|
| 67 |
|
cache.set(self.cache_key,
|
| 68 |
|
(template_body, expiry_time),
|
| 69 |
|
2592000) # bypass cache level expiration time
|
|
81 |
cache.set(self.cache_key, (combo_page_id, expiry_time),
|
|
82 |
2592000) # bypass cache level expiration time
|
|
83 |
if update_combo_page_id_cache:
|
|
84 |
cache.set(self.combo_page_id_cache_key(combo_page_id), (template_body, expiry_time),
|
|
85 |
2592000) # bypass cache level expiration time
|
|
86 |
|
| 70 |
87 |
|
| 71 |
88 |
def theme_base(request):
|
| 72 |
89 |
# this context processor adds two variables to context:
|
| 73 |
|
-
|