netsend.py

# --- communicating.. networking.. ---

__author__  = "anatoly techtonik <techtonik@gmail.com>"
__license__ = "MIT/Public Domain/CC0"
__version__ = "1.0.beta1"

import socket

IP4 = socket.AF_INET
UDP = socket.SOCK_DGRAM

class udp(object):
  """
  UDP client for sending arbitrary data over network.
  Synchronous (blocking), but supports timeouts.
  """

  def __init__(self, sendto, port, data=None, timeout=60):
    """
    If data is not None, send it immediately. Timeout is
    in seconds.
    """
    self.sendto = sendto
    self.portto = port
    self.sock = socket.socket(IP4, UDP)
    self.sock.settimeout(timeout)
    # counters
    self.sent = 0
    self.totalsent = 0
    self.received = 0
    self.totalreceived = 0
    # if port=0, system chooses random one for sending
    self.sock.bind(('', 0))
    if data:
      self.send(data)

  def send(self, data):
      self.sent = self.sock.sendto(data, (self.sendto, self.portto))
      self.totalsent += self.sent
      return self.sent

  def read(self, size):
      data = self.sock.recv(size)
      self.received = len(data)
      self.totalreceived += self.received
      return data

  def close(self):
    try:
      self.sock.shutdown(socket.SHUT_RDWR)
    except:
      pass
    self.sock.close()

# --- /networking ---

if __name__ == '__main__':
    client = udp('192.168.1.34', 5555, data="Hello")
    print client.read(100500)
    client.send('rawr!')
    client.close()