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# -*- Mode: Python -*-
VERSION_STRING = "$Id: thread_channel.py,v 1.3 2002/03/19 22:49:40 amk Exp $"
# This will probably only work on Unix.
# The disadvantage to this technique is that it wastes file
# descriptors (especially when compared to select_trigger.py)
# May be possible to do it on Win32, using TCP localhost sockets.
# [does winsock support 'socketpair'?]
import asyncore
import asynchat
import fcntl
import FCNTL
import os
import socket
import string
import thread
# this channel slaves off of another one. it starts a thread which
# pumps its output through the 'write' side of the pipe. The 'read'
# side of the pipe will then notify us when data is ready. We push
# this data on the owning data channel's output queue.
class thread_channel (asyncore.file_dispatcher):
buffer_size = 8192
def __init__ (self, channel, function, *args):
self.parent = channel
self.function = function
self.args = args
self.pipe = rfd, wfd = os.pipe()
asyncore.file_dispatcher.__init__ (self, rfd)
def start (self):
rfd, wfd = self.pipe
# The read side of the pipe is set to non-blocking I/O; it is
# 'owned' by medusa.
flags = fcntl.fcntl (rfd, FCNTL.F_GETFL, 0)
fcntl.fcntl (rfd, FCNTL.F_SETFL, flags | FCNTL.O_NDELAY)
# The write side of the pipe is left in blocking mode; it is
# 'owned' by the thread. However, we wrap it up as a file object.
# [who wants to 'write()' to a number?]
of = os.fdopen (wfd, 'w')
thread.start_new_thread (
self.function,
# put the output file in front of the other arguments
(of,) + self.args
)
def writable (self):
return 0
def readable (self):
return 1
def handle_read (self):
data = self.recv (self.buffer_size)
self.parent.push (data)
def handle_close (self):
# Depending on your intentions, you may want to close
# the parent channel here.
self.close()
# Yeah, it's bad when the test code is bigger than the library code.
if __name__ == '__main__':
import time
def thread_function (output_file, i, n):
print 'entering thread_function'
while n:
time.sleep (5)
output_file.write ('%2d.%2d %s\r\n' % (i, n, output_file))
output_file.flush()
n = n - 1
output_file.close()
print 'exiting thread_function'
class thread_parent (asynchat.async_chat):
def __init__ (self, conn, addr):
self.addr = addr
asynchat.async_chat.__init__ (self, conn)
self.set_terminator ('\r\n')
self.buffer = ''
self.count = 0
def collect_incoming_data (self, data):
self.buffer = self.buffer + data
def found_terminator (self):
data, self.buffer = self.buffer, ''
n = string.atoi (string.split (data)[0])
tc = thread_channel (self, thread_function, self.count, n)
self.count = self.count + 1
tc.start()
class thread_server (asyncore.dispatcher):
def __init__ (self, family=socket.AF_INET, address=('127.0.0.1', 9003)):
asyncore.dispatcher.__init__ (self)
self.create_socket (family, socket.SOCK_STREAM)
self.set_reuse_addr()
self.bind (address)
self.listen (5)
def handle_accept (self):
conn, addr = self.accept()
tp = thread_parent (conn, addr)
thread_server()
#asyncore.loop(1.0, use_poll=1)
asyncore.loop ()
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