def _incrdecr(self, cmd, key, delta):
memcache.check_key(key)
server, key = self._get_server(key)
if not server:
yield 0
self._statlog(cmd)
cmd = "%s %s %d" % (cmd, key, delta)
try:
yield server.send_cmd(cmd)
line = yield server.readline()
yield int(line)
except socket.error, msg:
if isinstance(msg, tuple): msg = msg[1]
server.mark_dead(msg)
yield None
def _set(self, cmd, key, val, time, min_compress_len = 0):
memcache.check_key(key)
server, key = self._get_server(key)
if not server:
yield 0
self._statlog(cmd)
store_info = self._val_to_store_info(val, min_compress_len)
if not store_info: yield 0
fullcmd = "%s %s %d %d %d\r\n%s" % (cmd, key, store_info[0], time, store_info[1], store_info[2])
try:
yield server.send_cmd(fullcmd)
yield ((yield server.expect("STORED")) == "STORED")
except socket.error, msg:
if isinstance(msg, tuple): msg = msg[1]
server.mark_dead(msg)
def get(self, key):
'''Retrieves a key from the memcache.
@return: The value or None.
'''
memcache.check_key(key)
server, key = self._get_server(key)
if not server:
yield None
self._statlog('get')
try:
yield server.send_cmd("get %s" % key)
rkey, flags, rlen, = yield self._expectvalue(server)
if not rkey:
yield None
value = yield self._recv_value(server, flags, rlen)
yield server.expect("END")
except (memcache._Error, socket.error), msg:
if isinstance(msg, tuple): msg = msg[1]
server.mark_dead(msg)
yield None
def delete(self, key, time=0):
'''Deletes a key from the memcache.
@return: Nonzero on success.
@param time: number of seconds any subsequent set / update commands should fail. Defaults to 0 for no delay.
@rtype: int
'''
memcache.check_key(key)
server, key = self._get_server(key)
if not server:
yield 0
self._statlog('delete')
if time != None:
cmd = "delete %s %d" % (key, time)
else:
cmd = "delete %s" % key
try:
yield server.send_cmd(cmd)
yield server.expect("DELETED")
except socket.error, msg:
if isinstance(msg, tuple): msg = msg[1]
server.mark_dead(msg)
yield 0
