# Implements asyncore-based UNIX transport domain
import os
import random
try:
    from socket import AF_UNIX
except ImportError:
    AF_UNIX = None
from pysnmp.carrier.base import AbstractTransportAddress
from pysnmp.carrier.asyncore.dgram.base import DgramSocketTransport

domainName = snmpLocalDomain = (1, 3, 6, 1, 2, 1, 100, 1, 13)

random.seed()

class UnixTransportAddress(str, AbstractTransportAddress):
    pass

class UnixSocketTransport(DgramSocketTransport):
    sockFamily = AF_UNIX
    addressType = UnixTransportAddress

    def openClientMode(self, iface=None):
        if iface is None:
            # UNIX domain sockets must be explicitly bound
            iface = ''
            while len(iface) < 8:
                iface += chr(random.randrange(65, 91))
                iface += chr(random.randrange(97, 123))
            iface = os.path.sep + 'tmp' + os.path.sep + 'pysnmp' + iface
        if os.path.exists(iface):
            os.remove(iface)
        DgramSocketTransport.openClientMode(self, iface)
        self.__iface = iface
        return self

    def openServerMode(self, iface):
        DgramSocketTransport.openServerMode(self, iface)
        self.__iface = iface
        return self

    def closeTransport(self):
        DgramSocketTransport.closeTransport(self)
        try:
            os.remove(self.__iface)
        except OSError:
            pass

UnixTransport = UnixSocketTransport

# Compatibility stub
UnixDgramSocketTransport = UnixSocketTransport
