def __init__(self, pipe_file, name=None, discovery=None):
super(NamedPipeListener, self).__init__(name=name)
if DiscUtilities().validate_named_pipe(pipe_file) == False:
return None
self._pipe_file = pipe_file
self.msg_queue = Queue()
self.discovery = discovery # backpoint to discovery obj
# Unblock previous writers
BUFFER_SIZE = 65536
ph = None
try:
ph = os.open(self._pipe_file, os.O_RDONLY | os.O_NONBLOCK)
flags = fcntl.fcntl(ph, fcntl.F_GETFL)
flags &= ~os.O_NONBLOCK
fcntl.fcntl(ph, fcntl.F_SETFL, flags)
while True:
buffer = os.read(ph, BUFFER_SIZE)
if not buffer:
break
except OSError as err:
import errno
if err.errno == errno.EAGAIN or err.errno == errno.EWOULDBLOCK:
pass # It is supposed to raise one of these exceptions
else:
raise err
finally:
if ph:
os.close(ph)
log.debug('NamedPipeListener is initialized')
print 'NamedPipeListener is initialized'
self.flag_alive = True
self.start()
def _executable_check(self):
if DiscUtilities().validate_named_pipe(
self.cmd_messenger_pipe) == False:
return None
# Will not initialize device simulator if simulator list is empty
if len(self.endpoint_list) is 0:
log.error(
"Device simulator failed because simulator list is empty")
return
def _executable_check(self):
if DiscUtilities().validate_named_pipe(self.cmd_messenger_pipe) == False:
return None
# Will not initialize device discovery if DISCOVERY_LISTENER list is empty
if len(self.endpoint_list) is 0:
log.error("Device discovery failed because listener list is empty")
return
# later needed when register device
if self.pkg_registry is None:
log.error("Device discovery failed because no package manager's registry info")
return