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cache_redis.py
144 lines (124 loc) · 3.91 KB
/
cache_redis.py
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from threading import Lock
import msgpack
from decimal import Decimal
import datetime
from urlparse import urlparse
import redis
from trytond.config import config
from trytond.transaction import Transaction
__all__ = ['Redis']
def freeze(o):
if isinstance(o, (set, tuple, list)):
return tuple(freeze(x) for x in o)
elif isinstance(o, dict):
return frozenset((x, freeze(y)) for x, y in o.iteritems())
else:
return o
def encode_hook(o):
if isinstance(o, Decimal):
return {
'__decimal__': True,
'data': str(o)
}
if isinstance(o, datetime.datetime):
return {
'__datetime__': True,
'data': (o.year, o.month, o.day, o.hour, o.minute, o.second,
o.microsecond)
}
if isinstance(o, datetime.date):
return {
'__date__': True,
'data': (o.year, o.month, o.day)
}
if isinstance(o, datetime.time):
return {
'__time__': True,
'data': (o.hour, o.minute, o.second, o.microsecond)
}
if isinstance(o, datetime.timedelta):
return {
'__timedelta__': True,
'data': o.total_seconds()
}
if isinstance(o, set):
return {
'__set__': True,
'data': tuple(o)
}
return o
def decode_hook(o):
if '__decimal__' in o:
return Decimal(o['data'])
elif '__datetime__' in o:
return datetime.datetime(*o['data'])
elif '__date__' in o:
return datetime.date(*o['data'])
elif '__time__' in o:
return datetime.time(*o['data'])
elif '__timedelta__' in o:
return datetime.timedelta(o['data'])
elif '__set__' in o:
return set(o['data'])
return o
class Redis(object):
_cache_instance = []
_client = None
_client_check_lock = Lock()
@classmethod
def ensure_client(cls):
with cls._client_check_lock:
if cls._client is None:
redis_url = config.get('cache', 'redis')
url = urlparse(redis_url)
assert url.scheme == 'redis', 'invalid redis url'
host = url.hostname
port = url.port
db = url.path.strip('/')
cls._client = redis.StrictRedis(host=host, port=port, db=db)
def __init__(self, name, size_limit=1024, context=True):
self.context = context
assert name not in set([i._name for i in self._cache_instance]), \
'%s is already used' % name
self._cache_instance.append(self)
self._name = name
self.ensure_client()
def _namespace(self, dbname=None):
if dbname is None:
dbname = Transaction().cursor.dbname
return '%s:%s' % (self._name, dbname)
def _key(self, key):
if self.context:
t = Transaction()
res = freeze((key, t.user, t.context))
else:
res = freeze(key)
return '%x' % hash(res)
def get(self, key, default=None):
namespace = self._namespace()
key = self._key(key)
result = self._client.hget(namespace, key)
if result is None:
return default
else:
return msgpack.unpackb(result, encoding='utf-8',
object_hook=decode_hook)
def set(self, key, value):
namespace = self._namespace()
key = self._key(key)
value = msgpack.packb(value, use_bin_type=True, default=encode_hook)
self._client.hset(namespace, key, value)
def clear(self):
namespace = self._namespace()
self._client.delete(namespace)
@classmethod
def clean(cls, dbname):
pass
@classmethod
def resets(cls, dbname):
pass
@classmethod
def drop(cls, dbname):
if cls._client is not None:
for inst in cls._cache_instance:
cls._client.delete(inst._namespace(dbname))