Beaker: 'expiretime' and memcached backend

[Andrew Stromnov]

Is 'expiretime' passed to memcached backend?

It seems that 'key:value; pair stays forever in memcached backend.

[Ben Bangert]

On Feb 21, 2008, at 2:53 AM, Andrew Stromnov wrote:

> Is 'expiretime' passed to memcached backend?
>
> It seems that 'key:value; pair stays forever in memcached backend

The expired time isn't passed to the backends, when Beaker stores a
value in any backend, it records the stored time in addition to the
value. Then upon retrieval of the value (and its stored time), it does
a check against the expiration to see if the value has expired, and
recreates it if it has. Until Beaker next accesses and invalidates the
value, it will not be removed from the backend.

Cheers,
Ben

[Andrew Stromnov]

stromnov@stromnov-desktop:~/Projects/beaker-bug$ cat step1.py
# -*- coding: utf-8 -*-

import time
from beaker.cache import CacheManager

mem_manager = CacheManager(type="memory")
mem_cache = mem_manager.get_cache("test")
mem_cache.clear()

mc_manager = CacheManager( type="ext:memcached",
url="localhost:11211", lock_dir="./mcd_lock")
mc_cache = mc_manager.get_cache("test")
mc_cache.clear()

def cachetest(cache, key):
try:
value = cache[key]
return "hit"
except KeyError:
return "miss"

mem_cache.set_value("key", "value", expiretime=7)
mc_cache.set_value("key", "value", expiretime=7)

for t in range(4):
print t, "mem", cachetest(mem_cache, "key")
print t, "mc ", cachetest(mc_cache, "key")
time.sleep(1)


stromnov@stromnov-desktop:~/Projects/beaker-bug$ cat step2.py
# -*- coding: utf-8 -*-

import time
from beaker.cache import CacheManager

mem_manager = CacheManager(type="memory")
mem_cache = mem_manager.get_cache("test")

mc_manager = CacheManager( type="ext:memcached",
url="localhost:11211", lock_dir="./mcd_lock")
mc_cache = mc_manager.get_cache("test")

def cachetest(cache, key):
try:
value = cache[key]
return "hit"
except KeyError:
return "miss"

for t in range(4):
print t, "mem", cachetest(mem_cache, "key")
print t, "mc ", cachetest(mc_cache, "key")
time.sleep(1)

stromnov@stromnov-desktop:~/Projects/beaker-bug$ python step1.py; echo
"pass 2"; python step2.py
0 mem hit
0 mc hit
1 mem hit
1 mc hit
2 mem hit
2 mc hit
3 mem hit
3 mc hit
pass 2
0 mem miss
0 mc hit
1 mem miss
1 mc hit
2 mem miss
2 mc hit
3 mem miss
3 mc hit

So, memcache stored value forever, if application was restarted.
In many cases memcached backend used by many apps together, so clear()
method should be avoided.

I think that 'expiretime' should be passed to memcache backend.

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