本文整理汇总了Python中database.DBCache.gethostname方法的典型用法代码示例。如果您正苦于以下问题：Python DBCache.gethostname方法的具体用法？Python DBCache.gethostname怎么用？Python DBCache.gethostname使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类database.DBCache的用法示例。
在下文中一共展示了DBCache.gethostname方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: BECache
# 需要导入模块: from database import DBCache [as 别名]
# 或者: from database.DBCache import gethostname [as 别名]
#.........这里部分代码省略.........
if backend is None:
# no backend given, use master
self.host = self.db.settings.NULL.MasterServerIP
self.hostname = self.db._gethostfromaddr(self.host)
else:
backend = backend.strip('[]')
query = "SELECT hostname FROM settings WHERE value=? AND data=?"
if self._reip.match(backend):
# given backend is IP address
self.host = backend
self.hostname = self.db._gethostfromaddr(
backend, 'BackendServerIP')
elif check_ipv6(backend):
# given backend is IPv6 address
self.host = backend
self.hostname = self.db._gethostfromaddr(
backend, 'BackendServerIP6')
else:
# given backend is hostname, pull address from database
self.hostname = backend
self.host = self.db._getpreferredaddr(backend)
# lookup port from database
self.port = int(self.db.settings[self.hostname].BackendServerPort)
if not self.port:
raise MythDBError(MythError.DB_SETTING, 'BackendServerPort',
self.port)
self._ident = '%s:%d' % (self.host, self.port)
if self._ident in self._shared:
# existing connection found
self._conn = self._shared[self._ident]
if self.sendcommands:
if self._conn.command is None:
self._conn.command = self._newcmdconn()
elif self.blockshutdown:
# upref block of shutdown
# issue command to backend if needed
self._conn.blockshutdown += 1
if self._conn.blockshutdown == 1:
self._conn.command.blockShutdown()
if self.receiveevents:
if self._conn.event is None:
self._conn.event = self._neweventconn()
else:
# no existing connection, create new
self._conn = self._ConnHolder()
if self.sendcommands:
self._conn.command = self._newcmdconn()
if self.blockshutdown:
self._conn.blockshutdown = 1
if self.receiveevents:
self._conn.event = self._neweventconn()
self._shared[self._ident] = self._conn
self._events = self._listhandlers()
for func in self._events:
self.registerevent(func)
def __del__(self):
# downref block of shutdown
# issue command to backend if needed
#print 'destructing BECache'
if self.blockshutdown:
self._conn.blockshutdown -= 1
if not self._conn.blockshutdown:
self._conn.command.unblockShutdown()
def _newcmdconn(self):
return BEConnection(self.host, self.port, self.db.gethostname(),
self.blockshutdown)
def _neweventconn(self):
return BEEventConnection(self.host, self.port, self.db.gethostname())
def backendCommand(self, data):
"""
obj.backendCommand(data) -> response string
Sends a formatted command via a socket to the mythbackend.
"""
if self._conn.command is None:
return ""
return self._conn.command.backendCommand(data)
def _listhandlers(self):
return []
def registerevent(self, func, regex=None):
if self._conn.event is None:
return
if regex is None:
regex = func()
self._conn.event.registerevent(regex, func)
def clearevents(self):
self._events = []示例2: BECache
# 需要导入模块: from database import DBCache [as 别名]
# 或者: from database.DBCache import gethostname [as 别名]
class BECache( SplitInt ):
"""
BECache(backend=None, noshutdown=False, db=None)
-> MythBackend connection object
Basic class for mythbackend socket connections.
Offers connection caching to prevent multiple connections.
'backend' allows a hostname or IP address to connect to. If not provided,
connect will be made to the master backend. Port is always
taken from the database.
'db' allows an existing database object to be supplied.
'noshutdown' specified whether the backend will be allowed to go into
automatic shutdown while the connection is alive.
Available methods:
joinInt() - convert two signed ints to one 64-bit
signed int
splitInt() - convert one 64-bit signed int to two
signed ints
backendCommand() - Sends a formatted command to the backend
and returns the response.
"""
logmodule = 'Python Backend Connection'
_shared = weakref.WeakValueDictionary()
_reip = re.compile('(?:\d{1,3}\.){3}\d{1,3}')
def __repr__(self):
return "<%s 'myth://%s:%d/' at %s>" % \
(str(self.__class__).split("'")[1].split(".")[-1],
self.hostname, self.port, hex(id(self)))
def __init__(self, backend=None, noshutdown=False, db=None, opts=None):
self.db = DBCache(db)
self.log = MythLog(self.logmodule, db=self.db)
self.hostname = None
if opts is None:
self.opts = BEConnection.BEConnOpts(noshutdown)
else:
self.opts = opts
if backend is None:
# no backend given, use master
self.host = self.db.settings.NULL.MasterServerIP
else:
if self._reip.match(backend):
# given backend is IP address
self.host = backend
else:
# given backend is hostname, pull address from database
self.hostname = backend
self.host = self.db.settings[backend].BackendServerIP
if not self.host:
raise MythDBError(MythError.DB_SETTING,
'BackendServerIP', backend)
if self.hostname is None:
# reverse lookup hostname from address
with self.db.cursor(self.log) as cursor:
if cursor.execute("""SELECT hostname FROM settings
WHERE value='BackendServerIP'
AND data=?""", [self.host]) == 0:
# no match found
raise MythDBError(MythError.DB_SETTING, 'BackendServerIP',
self.host)
self.hostname = cursor.fetchone()[0]
# lookup port from database
self.port = int(self.db.settings[self.hostname].BackendServerPort)
if not self.port:
raise MythDBError(MythError.DB_SETTING, 'BackendServerPort',
self.port)
self._uuid = uuid4()
self._ident = '%s:%d' % (self.host, self.port)
if self._ident in self._shared:
# existing connection found
# register and reconnect if necessary
self.be = self._shared[self._ident]
self.be.registeruser(self._uuid, self.opts)
self.be.reconnect()
else:
# no existing connection, create new
self.be = BEConnection(self.host, self.port, \
self.db.gethostname(), self.opts)
self.be.registeruser(self._uuid, self.opts)
self._shared[self._ident] = self.be
def backendCommand(self, data):
"""
obj.backendCommand(data) -> response string
Sends a formatted command via a socket to the mythbackend.
"""
return self.be.backendCommand(data)