def __init__(self):
self.opentac = OpenTac()
class OpenTacTelnet(object):
running = False
delay = 1
rpc_delay = 2
blocksize = 4 * 1024
all_groups = {}
group_port = 4826 # 19 inches in mm * 10
# All data handling for each connection happens on this local reference into the
# all_groups dict with a new group looked up each time.
group = None
conn = None
host = "localhost"
def __init__(self):
self.opentac = OpenTac()
def run(self):
sock = None
while 1:
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
try:
logging.debug("binding to %s:%s", self.host, self.group_port)
print "binding to %s:%s" % (self.host, self.group_port)
sock.bind(('0.0.0.0', self.group_port))
break
except socket.error as exc:
logging.warn(
"Unable to bind, trying again with delay=%d msg=%s",
self.delay, exc.message)
time.sleep(self.delay)
self.delay *= 2
sock.listen(1)
self.running = True
while self.running:
logging.info("Ready to accept new connections")
print "Ready to accept new connections"
self.conn, _ = sock.accept()
# read the header to get the size of the message to follow
data = str(self.conn.recv(8)) # 32bit limit
try:
count = int(data, 16)
except ValueError:
logging.debug(
"Invalid message: %s from %s",
data, self.conn.getpeername()[0])
self.conn.close()
continue
ccc = 0
data = ''
# get the message itself
while ccc < count:
data += self.conn.recv(self.blocksize)
ccc += self.blocksize
self.data_received(data)
def _ack_response(self):
msgdata = self._format_message("ack")
if msgdata:
self.conn.send(msgdata[0])
self.conn.send(msgdata[1])
self.conn.close()
def _bad_request(self):
msgdata = self._format_message("nack")
if msgdata:
self.conn.send(msgdata[0])
self.conn.send(msgdata[1])
self.conn.close()
def _wait_response(self):
msgdata = self._formatMessage("wait")
if msgdata:
self.conn.send(msgdata[0])
self.conn.send(msgdata[1])
self.conn.close()
def _format_message(self, message):
msglen = "%08X" % len(message)
if int(msglen, 16) > 0xFFFFFFFF:
logging.error("Message was too long to send! %d > %d" %
(int(msglen, 16), 0xFFFFFFFF))
return None
return msglen, message
def data_received(self, data):
if not isinstance(data, str):
return None
data = str(data).strip()
if not data:
self._bad_request()
return None
if data == 'alarm':
self.opentac.red_led_on()
elif data == 'clear_alarm':
self.opentac.red_led_off()
elif data == 'green_on':
self.opentac.green_led_on()
elif data == 'green_off':
self.opentac.green_led_off()
self._ack_response()
return
def finalize(self):
self.opentac.teardown()
