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###############################################################################
#
# Copyright (c) 2012 Ruslan Spivak
#
# 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.
#
###############################################################################
"""
TCP Concurrent Server, One Child per Client (fork).
Multiple server processes to handle any number of clients.
"""
__author__ = 'Ruslan Spivak <ruslan.spivak@gmail.com>'
import os
import sys
import errno
import signal
import socket
import optparse
BACKLOG = 5
def _reap_children(signum, frame):
"""Collect zombie children."""
while True:
try:
# wait for all children, do not block
pid, status = os.waitpid(-1, os.WNOHANG)
if pid == 0: # no more zombies
break
except:
# Usually this would be OSError exception
# with 'errno' attribute set to errno.ECHILD
# which means there are no more children
break
def handle(sock):
# read a line that tells us how many bytes to write
bytes = int(sock.recv(1024))
# get our random bytes
data = os.urandom(bytes)
print 'Got request to send %d bytes. Sending them all...' % bytes
# send them all
sock.sendall(data)
def serve_forever(host, port):
# setup SIGCHLD handler
signal.signal(signal.SIGCHLD, _reap_children)
# create, bind. listen
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# re-use the port
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind((host, port))
sock.listen(BACKLOG)
print 'Listening on port %d ...' % port
# spawn a new child process for every request
while True:
try:
conn, client_address = sock.accept()
except IOError as e:
code, msg = e.args
if code == errno.EINTR:
continue
else:
raise
pid = os.fork()
if pid == 0: # child
# close listening socket
sock.close()
handle(conn)
os._exit(0)
# parent - close connected socket
conn.close()
def main():
parser = optparse.OptionParser()
parser.add_option(
'-i', '--host', dest='host', default='0.0.0.0',
help='Hostname or IP address. Default is 0.0.0.0'
)
parser.add_option(
'-p', '--port', dest='port', type='int', default=2000,
help='Port. Default is 2000')
options, args = parser.parse_args()
serve_forever(options.host, options.port)
if __name__ == '__main__':
main()