[web2py] fall back for memcached to db caching

[Adi]

Tried catching the exception when memcache is not available to switch to db 
caching, but getting an excepting. 

Should it be possible to catch this exception, ignore it and continue 
running? 

Thanks,
Adnan


try:
    from gluon.contrib.memcache import MemcacheClient
    memcache_servers = ['127.0.0.1:11211']
    cache.memcache = MemcacheClient(request, memcache_servers)
    cache.ram = cache.disk = cache.memcache
    from gluon.contrib.memdb import MEMDB
    session.connect(request,response,db=MEMDB(cache.memcache))
except:
    sys.exc_clear()
    session.connect(request, response, db=db)
    pass



Traceback (most recent call last):
 File "/Users/adnan/web2py24/gluon/main.py", line 557, in wsgibase
 session._try_store_in_db(request, response)
 File "/Users/adnan/web2py24/gluon/globals.py", line 739, in_try_store_in_db
 record_id = table.insert(**dd)
 File "/Users/adnan/web2py24/gluon/contrib/memdb.py", line 256, in insert
 id = self._create_id()
 File "/Users/adnan/web2py24/gluon/contrib/memdb.py", line 296, in_create_id
 raise Exception('cannot set memcache')
Exception: cannot set memcache



Frames 
 
 

 File /Users/adnan/web2py24/gluon/main.py in wsgibase at line 557 code 
arguments variables 
 
 

 File /Users/adnan/web2py24/gluon/globals.py in _try_store_in_db at line 
739code arguments variables 
 
 

 File /Users/adnan/web2py24/gluon/contrib/memdb.py in insert at line 256code 
arguments variables 
 
 

 File /Users/adnan/web2py24/gluon/contrib/memdb.py in _create_id at line 
296code arguments variables 
 
Function argument list 

(self=<DALStorage {'client_ip': <gluon.contrib.memdb.F...luon.contrib.memdb.
Field object at 0x111d554d0>}>) 
 
Code listing 
291.
292.
293.
294.
295.

296.
297.
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 id = self._tableobj.incr(shard_id)
 if not id:
 if self._tableobj.set(shard_id, '0'):
 id = 0
 else:

 raise Exception('cannot set memcache')
 return long(str(shard) + str(id))

 def __str__(self):
 return self._tablename












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