def select(r, w, e, t=None):
"""a select() wrapper that allows tuples to represent sockets"""
x = r or w or e
if not x:
return [], [], []
x = x[0]
for i in range(len(x)): # identify proper tuple index
# print 'type check', i, type(x[i])
if isinstance(x[i], socket.socket):
break
if r:
ra = zip(*r)[i]
else:
ra = ()
if w:
wa = zip(*w)[i]
else:
wa = ()
if e:
ea = zip(*e)[i]
else:
ea = ()
r2, w2, e2 = select_call(ra, wa, ea, t)
return (filter(lambda a: a[i] in r2, r), filter(lambda a: a[i] in w2, w), filter(lambda a: a[i] in e2, e))
def client(sock):
tell(sock, "CHAT", "Welcome to the server!")
buf = "" # packet buffer
bytes_remaining = 0
greenlet.getcurrent().parent.switch(None)
while 1:
# Received a partial packet; return control to parent greenlet while we wait for the rest of it
if bytes_remaining:
print "SWITCH: if bytes_remaining"
greenlet.getcurrent().parent.switch(None)
# In between incoming packets
else:
# A packet was completed?
if buf:
# Pass message packet up to parent greenlet
print "SWITCH: if buf"
greenlet.getcurrent().parent.switch(buf[:4], buf[4:])
buf = ""
# A packet is beginning...
if (not bytes_remaining) and (not buf):
# When parent greenlet returns to us, we have a new data ready
buf = sock.recv(1)
# Check for disconnect
if len(buf) == 0:
raise socket.error(107, "apparent disconnection")
bytes_remaining = ord(buf) + 5
buf = ""
# Check that there is no more data available before returning control
print
print "select_call()"
r, w, e = select_call([sock], [], [], 0)
print "select_call() returned"
print
if not r:
print "SWITCH: if not r"
greenlet.getcurrent().parent.switch(None)
# Receive more data
more = sock.recv(bytes_remaining)
# Check for disconnect
if not more:
raise socket.error(107, "apparent disconnection (packet dropped)")
# Pump message packet buffering
buf += more
bytes_remaining -= len(more)
