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executable file 87 lines (81 sloc) 2.557 kB
#!/usr/bin/env python
import sys, os, socket, select, struct, time
listener = socket.socket()
listener.bind(('127.0.0.1', 0))
listener.listen(500)
servers = []
clients = []
remain = {}
NUMCLIENTS = 50
count = 0
while 1:
if len(clients) < NUMCLIENTS:
c = socket.socket()
c.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
c.bind(('0.0.0.0', 0))
c.connect(listener.getsockname())
count += 1
if count >= 16384:
count = 1
print 'cli CREATING %d' % count
b = struct.pack('I', count) + 'x'*count
remain[c] = count
print 'cli >> %r' % len(b)
c.send(b)
c.shutdown(socket.SHUT_WR)
clients.append(c)
r = [listener]
time.sleep(0.1)
else:
r = [listener]+servers+clients
print 'select(%d)' % len(r)
r,w,x = select.select(r, [], [], 5)
assert(r)
for i in r:
if i == listener:
s,addr = listener.accept()
servers.append(s)
elif i in servers:
b = i.recv(4096)
print 'srv << %r' % len(b)
if not i in remain:
assert(len(b) >= 4)
want = struct.unpack('I', b[:4])[0]
b = b[4:]
#i.send('y'*want)
else:
want = remain[i]
if want < len(b):
print 'weird wanted %d bytes, got %d: %r' % (want, len(b), b)
assert(want >= len(b))
want -= len(b)
remain[i] = want
if not b: # EOF
if want:
print 'weird: eof but wanted %d more' % want
assert(want == 0)
i.close()
servers.remove(i)
del remain[i]
else:
print 'srv >> %r' % len(b)
i.send('y'*len(b))
if not want:
i.shutdown(socket.SHUT_WR)
elif i in clients:
b = i.recv(4096)
print 'cli << %r' % len(b)
want = remain[i]
if want < len(b):
print 'weird wanted %d bytes, got %d: %r' % (want, len(b), b)
assert(want >= len(b))
want -= len(b)
remain[i] = want
if not b: # EOF
if want:
print 'weird: eof but wanted %d more' % want
assert(want == 0)
i.close()
clients.remove(i)
del remain[i]
listener.accept()
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