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#!/usr/bin/env python
#
# Based on simulated XIA PFCU-4 filter controller.
#
# For usage, see my printUsage function or run me with my -h option.
#
import getopt
import asynchat
import asyncore
import os
#import re
import signal
import socket
import sys
#import time
DEFAULT_PORT = 31337
def main(args):
(port, isDebugOutputEnabled) = parseCommandLineArgs(args)
d = ConnectionDispatcher(port, isDebugOutputEnabled)
asyncore.loop()
def getProgramName(args=None):
if args == None: args = sys.argv
if len(args) == 0 or args[0] == "-c": return "PROGRAM_NAME"
return os.path.basename(args[0])
def parseCommandLineArgs(args):
(options, extra) = getopt.getopt(args[1:], "dp:h", ["debug", "port=",
"help"])
port = DEFAULT_PORT
isDebugOutputEnabled = False
for eachOptName, eachOptValue in options:
if eachOptName in ("-d", "--debug"):
isDebugOutputEnabled = True
elif eachOptName in ("-p", "--port"):
port = int(eachOptValue)
elif eachOptName in ("-h", "--help"):
printUsage(sys.stdout)
sys.exit(0)
if len(extra) > 0:
print >> sys.stderr, "Error: unexpected command line argument \"%s\"" % \
extra[0]
printUsage(sys.stderr)
sys.exit(1)
return (port, isDebugOutputEnabled)
def printUsage(outStream):
print >> outStream, """\
Usage: %s [-dph]
Options:
-d,--debug Print debug messages to stderr
-p,--port=NUMBER Listen on the specified port NUMBER for incoming
connections (default: %d)
-h,--help Print usage message and exit\
""" % (getProgramName(), DEFAULT_PORT)
class ConnectionDispatcher(asyncore.dispatcher):
def __init__(self, port, debugOutputEnabled=False):
asyncore.dispatcher.__init__(self)
self.port = port
self.debugOutputEnabled = debugOutputEnabled
# xia pfcu 4 example used 16 devices
self.device = KevinRelay()
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
self.set_reuse_addr()
self.bind(("", port))
self.listen(5)
def handle_accept(self):
ConnectionSession(self.accept(), self.device, self.debugOutputEnabled)
class ConnectionSession(asynchat.async_chat):
## regular expressions, if necessary, can go here
def __init__(self, (conn, addr), device, debugOutputEnabled=False):
asynchat.async_chat.__init__(self, conn)
self.debugOutputEnabled = debugOutputEnabled
self.set_terminator("\r")
self.outputTerminator = "\r\n"
self.device = device
self.buffer = ""
def collect_incoming_data(self, data):
self.buffer = self.buffer + data
def found_terminator(self):
data = self.buffer
self.buffer = ""
if self.debugOutputEnabled:
print >> sys.stderr, "< \"%s\"" % \
(data + self.get_terminator()).encode("string_escape")
self.handleClientRequest(data)
def handleClientRequest(self, request):
request = request.strip()
#print request
## handle actual commands here
if len(request) >= 2:
if request[0] == chr(254):
## NOTE chr(254) is 376 in octal
if request[1] == chr(0):
# turn off relay 1
print("Turn off relay 1")
self.device.setRelayState(0, 0)
elif request[1] == chr(1):
# turn on relay 1
print("Turn on relay 1")
self.device.setRelayState(0, 1)
elif request[1] == chr(2):
# turn off relay 2
print("Turn off relay 2")
self.device.setRelayState(1, 0)
elif request[1] == chr(3):
# turn on relay 2
print("Turn on relay 2")
self.device.setRelayState(1, 1)
elif request[1] == chr(4):
# get relay 1 status
print("Get relay 1 status")
status = self.device.getRelayState(0)
self.sendClientResponse("%i" % status)
elif request[1] == chr(5):
# get relay 2 status
print("Get relay 2 status")
status = self.device.getRelayState(1)
self.sendClientResponse("%i" % status)
else:
print("Other commands not implemented yet")
else:
print("First char wasn't the 254")
else:
print("Command wasn't at least two characters")
##
return
def sendClientResponse(self, response=""):
data = response + self.outputTerminator
self.push(data)
if self.debugOutputEnabled:
print >> sys.stderr, "> \"%s\"" % data.encode("string_escape")
class KevinRelay:
def __init__(self):
self.relayStates = [0, 0]
def getRelayState(self, relay):
return self.relayStates[relay]
def setRelayState(self, relay, state):
self.relayStates[relay] = state
if __name__ == '__main__':
try:
# command omitted
main(sys.argv)
except Exception, e:
if isinstance(e, SystemExit):
raise e
else:
print >> sys.stderr
print >> sys.stderr, "Error: %s" % e
sys.exit(1)