当前位置: 首页>>代码示例>>Python>>正文


Python DBCache._getpreferredaddr方法代码示例

本文整理汇总了Python中MythTV.database.DBCache._getpreferredaddr方法的典型用法代码示例。如果您正苦于以下问题:Python DBCache._getpreferredaddr方法的具体用法?Python DBCache._getpreferredaddr怎么用?Python DBCache._getpreferredaddr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MythTV.database.DBCache的用法示例。


在下文中一共展示了DBCache._getpreferredaddr方法的1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 MythTV.database import DBCache [as 别名]
# 或者: from MythTV.database.DBCache import _getpreferredaddr [as 别名]
class BECache( object ):
    """
    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:
        backendCommand()    - Sends a formatted command to the backend
                              and returns the response.
    """

    class _ConnHolder( object ):
        blockshutdown = 0
        command = None
        event = None

    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, blockshutdown=False, events=False, db=None):
        self.db = DBCache(db)
        self.log = MythLog(self.logmodule, db=self.db)
        self.hostname = None

        self.sendcommands = True
        self.blockshutdown = blockshutdown
        self.receiveevents = events

        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
#.........这里部分代码省略.........
开发者ID:Beirdo,项目名称:mythtv-stabilize,代码行数:103,代码来源:mythproto.py


注:本文中的MythTV.database.DBCache._getpreferredaddr方法示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台,相关代码片段筛选自各路编程大神贡献的开源项目,源码版权归原作者所有,传播和使用请参考对应项目的License;未经允许,请勿转载。