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simple_network.py
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simple_network.py
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#simpler networking solution
from SocketServer import *
import threading
import socket
import node
import message
from Queue import *
import time
from worker_handler import WorkerManager
CHUNKSIZE = 64
##stolen from http://code.activestate.com/recipes/574454-thread-pool-mixin-class-for-use-with-socketservert/
class ThreadPoolMixIn(ThreadingMixIn):
'''
use a thread pool instead of a new thread on every request
'''
numThreads = 10
allow_reuse_address = True # seems to fix socket.error on server restart
def serve_forever(self):
'''
Handle one request at a time until doomsday.
'''
# set up the threadpool
self.requests = Queue(self.numThreads)
for x in range(self.numThreads):
t = threading.Thread(target = self.process_request_thread)
t.setDaemon(1)
t.start()
# server main loop
while True:
self.handle_request()
self.server_close()
def process_request_thread(self):
'''
obtain request from queue instead of directly from server socket
'''
while True:
ThreadingMixIn.process_request_thread(self, *self.requests.get())
def handle_request(self):
'''
simply collect requests and put them on the queue for the workers.
'''
try:
request, client_address = self.get_request()
except socket.error:
return
if self.verify_request(request, client_address):
self.requests.put((request, client_address))
class ThreadedServer(ThreadPoolMixIn, TCPServer):
pass
class NETWORK_SERVICE(object):
def sender_loop(self, x):
#print "sender loop", x
priority, dest, msg = x
self.client_send(dest,msg)
def send_message(self,msg,dest):
#print "send message called"
msg_pack = (msg.priority,dest,msg)
self.client_worker.putjob(msg_pack)
def __init__(self,HOST="localhost",PORT=9000):
# Create the server, binding to localhost on port 9999
self.server = ThreadedServer((HOST, PORT), MyTCPHandler)
self.tosend = PriorityQueue()
# Activate the server; this will keep running until you
# interrupt the program with Ctrl-C
self.server_worker = WorkerManager()
self.server_worker.set_target(self.server.serve_forever)
self.server_worker.ishandler = False
self.server_worker.ideal_threads = 1
self.server_worker.start()
self.client_worker = WorkerManager()
self.client_worker.set_target(self.sender_loop)
self.client_worker.ideal_threads = 4
self.client_worker.start()
def stop(self):
self.server.shutdown()
self.server_worker.stop()
self.client_worker.stop()
def update_messages_in_queue(self, failed_node):
hold = []
while not self.tosend.empty():
temp = self.tosend.get()
self.tosend.task_done()
if temp[1] == failed_node:
node.message_failed(temp[2],temp[1])
else:
hold.append(temp)
for h in hold:
self.tosend.put()
def client_send(self, dest, msg):
#print "sending", msg.service, msg.type, str(dest)
HOST = dest.IPAddr
PORT = dest.ctrlPort
DATA = msg.serialize()
##print len(DATA)
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.settimeout(2.0)
try:
# Connect to server and send data
sock.connect((HOST, PORT))
sock.send(DATA)
sock.shutdown(1)
ack = sock.recv(1)
except socket.error:
##print e
#sock.close()
print "SOCKET ERROR"
print "Tried to send to ", HOST, ":",PORT
node.message_failed(msg,dest)
#self.update_messages_in_queue(dest)
finally:
#print ">",
sock.close()
##print DATA[-20:],len(DATA)%8
return True
class MyTCPHandler(BaseRequestHandler):
"""
The RequestHandler class for our server.
It is instantiated once per connection to the server, and must
override the handle() method to implement communication to the
client.
"""
def __init__(self, request, client_address, server):
self.data = ""
BaseRequestHandler.__init__(self, request, client_address, server)
def handle(self):
# self.request is the TCP socket connected to the client
data = ""
data0="0"
while len(data0) > 0:
###print length
data0 = self.request.recv(1024)
data+=data0
self.request.send("ack")
#self.request.shutdown()
self.request.close()
msg = message.Message.deserialize(data)
#print "]",
node.handle_message(msg)
def handle_error(self, request, client_address):
print client_address,"tried to talk to me and failed"