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Use a key function that is safe for use w/ memcache

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This commit is contained in:
Calen Pennington
2012-05-25 09:30:04 -04:00
parent f632db0e9d
commit 88ff84dd2e
5 changed files with 29 additions and 3 deletions
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4
envs/dev.py
View File

@@ -31,7 +31,8 @@ CACHES = {
# In staging/prod envs, the sessions also live here.
'default': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
'LOCATION': 'mitx_loc_mem_cache'
'LOCATION': 'mitx_loc_mem_cache',
'KEY_FUNCTION': 'util.memcache.safe_key',
},
# The general cache is what you get if you use our util.cache. It's used for
@@ -43,6 +44,7 @@ CACHES = {
'BACKEND': 'django.core.cache.backends.dummy.DummyCache',
'KEY_PREFIX': 'general',
'VERSION': 4,
'KEY_FUNCTION': 'util.cache.memcache_safe_key',
}
}

2
envs/devplus.py
View File

@@ -30,12 +30,14 @@ CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
'LOCATION': '127.0.0.1:11211',
'KEY_FUNCTION': 'util.memcache.safe_key',
},
'general': {
'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
'LOCATION': '127.0.0.1:11211',
'KEY_PREFIX' : 'general',
'VERSION' : 5,
'KEY_FUNCTION': 'util.memcache.safe_key',
}
}

4
envs/static.py
View File

@@ -30,7 +30,8 @@ CACHES = {
# In staging/prod envs, the sessions also live here.
'default': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
'LOCATION': 'mitx_loc_mem_cache'
'LOCATION': 'mitx_loc_mem_cache',
'KEY_FUNCTION': 'util.memcache.safe_key',
},
# The general cache is what you get if you use our util.cache. It's used for
@@ -42,6 +43,7 @@ CACHES = {
'BACKEND': 'django.core.cache.backends.dummy.DummyCache',
'KEY_PREFIX': 'general',
'VERSION': 4,
'KEY_FUNCTION': 'util.memcache.safe_key',
}
}

4
envs/test.py
View File

@@ -54,7 +54,8 @@ CACHES = {
# In staging/prod envs, the sessions also live here.
'default': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
'LOCATION': 'mitx_loc_mem_cache'
'LOCATION': 'mitx_loc_mem_cache',
'KEY_FUNCTION': 'util.memcache.safe_key',
},
# The general cache is what you get if you use our util.cache. It's used for
@@ -66,6 +67,7 @@ CACHES = {
'BACKEND': 'django.core.cache.backends.dummy.DummyCache',
'KEY_PREFIX': 'general',
'VERSION': 4,
'KEY_FUNCTION': 'util.memcache.safe_key',
}
}

18
lib/util/memcache.py Normal file
View File

@@ -0,0 +1,18 @@
"""
This module provides a KEY_FUNCTION suitable for use with a memcache backend
so that we can cache any keys, not just ones that memcache would ordinarily accept
"""
from django.utils.hashcompat import md5_constructor
from django.utils.encoding import smart_str
import string
def safe_key(key, key_prefix, version):
safe_key = smart_str(key)
for char in safe_key:
if ord(char) < 33 or ord(char) == 127:
safe_key = safe_key.replace(char, '_')
if len(safe_key) > 250:
safe_key = md5_constructor(safe_key)
return ":".join([key_prefix, str(version), safe_key])