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Python DBCache.gethostname方法代码示例

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, 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 = []
开发者ID:camdbug,项目名称:mythtv,代码行数:104,代码来源:mythproto.py

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)
开发者ID:DocOnDev,项目名称:mythtv,代码行数:99,代码来源:mythproto.py


注:本文中的database.DBCache.gethostname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。