client.py
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#!/usr/bin/env python
###############################################################################
# mjc-broker #
# client.py #
# #
# (C) 2016 David Zhong #
# #
# Permission is hereby granted, free of charge, to any person obtaining a #
# copy of this software and associated documentation files (the "Software"), #
# to deal in the Software without restriction, including without limitation #
# the rights to use, copy, modify, merge, publish, distribute, sublicense, #
# and/or sell copies of the Software, and to permit persons to whom the #
# Software is furnished to do so, subject to the following conditions: #
# #
# The above copyright notice and this permission notice shall be included in #
# all copies or substantial portions of the Software. #
# #
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR #
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, #
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE #
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER #
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING #
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER #
# DEALINGS IN THE SOFTWARE. #
###############################################################################
import asyncore
import json
import logging
import observable
import socket
usage = "usage: client.py <host> <port>"
class BrokerClient(asyncore.dispatcher_with_send, observable.Observable):
_observable_fields_ = ["status", "fatal", "error", "pair", "clients", "address"]
def __init__(self, host, port):
asyncore.dispatcher_with_send.__init__(self)
observable.Observable.__init__(self)
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
self.addr = (host, port)
self.buffer = ""
self.name = None
def send(self, data):
asyncore.dispatcher_with_send.send(self, json.dumps(data))
asyncore.dispatcher_with_send.send(self, "\r\n\r\n")
def handle_read(self):
self.buffer += self.recv(1024)
packets = self.buffer.split("\r\n\r\n")
self.buffer = packets[-1]
[self.ProcessPDU(x) for x in packets[:-1]]
def handle_close(self):
self._sendMessage("status", "closed")
self.close()
def handle_connect(self):
self._sendMessage("status", "connected")
def Connect(self):
self.connect(self.addr)
def DoRegister(self, name):
if self.name is None:
self.SendRegister(name)
def DoRequestPair(self, name):
if self.name is not None:
self.SendPair(name)
def ProcessPDU(self, packet):
try:
message = json.loads(packet)
except ValueError:
logging.warning("invalid packet: %s", packet)
return
try:
typ = message["type"]
except KeyError:
logging.warning("invalid packet: %s", packet)
return
if typ == "fatal" or typ == "error":
if "message" in message:
err = message["message"]
else:
err = "no error specified"
self._sendMessage(typ, err)
if typ == "fatal":
self.handle_close()
elif typ == "pair":
try:
self._sendMessage("pair", (message["name"], message["local_port"], message["remote_address"], message["remote_port"]))
except KeyError:
logging.error("problem with pair request: %s", packet)
elif typ == "clients":
try:
self._sendMessage("clients", message["clients"])
except KeyError:
logging.error("problem with client list: %s", packet)
elif typ == "registerok":
if "name" not in message or "address" not in message:
logging.error("problem with registerok: %s", packet)
else:
self.name = message["name"]
self._sendMessage("status", "registered")
self._sendMessage("address", message["address"])
def SendRegister(self, name):
packet = {
"type": "register",
"name": name
}
self.send(packet)
def SendPair(self, name):
packet = {
"type": "pair",
"respondent": name
}
self.send(packet)
def main():
import sys
import threading
import traceback
if len(sys.argv) < 3:
print usage
return
HOST = sys.argv[1]
try:
PORT = int(sys.argv[2])
except ValueError:
print "invalid port"
print usage
return
msg_queue = []
def printfunc(s): print s
client = BrokerClient(HOST, PORT)
client.subscribe(lambda topic, message: printfunc("%s: %s" % (topic, message)))
client.Connect()
while True:
x = raw_input("> ")
if x:
try:
eval(x)
except KeyboardInterrupt:
return
except:
traceback.print_exc()
asyncore.poll()
if __name__ == "__main__":
main()