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"""Based on code from timeout_socket.py, with some tweaks for compatibility.
These tweaks should really be rolled back into timeout_socket, but it's
not totally clear who is maintaining it at this point. In the meantime,
we'll use a different module name for our tweaked version to avoid any
confusion.
The original timeout_socket is by:
Scott Cotton <scott@chronis.pobox.com>
Lloyd Zusman <ljz@asfast.com>
Phil Mayes <pmayes@olivebr.com>
Piers Lauder <piers@cs.su.oz.au>
Radovan Garabik <garabik@melkor.dnp.fmph.uniba.sk>
"""
ident = "$Id$"
import string, socket, select, errno
WSAEINVAL = getattr(errno, 'WSAEINVAL', 10022)
class TimeoutSocket:
"""A socket imposter that supports timeout limits."""
def __init__(self, timeout=20, sock=None):
self.timeout = float(timeout)
self.inbuf = ''
if sock is None:
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.sock = sock
self.sock.setblocking(0)
self._rbuf = ''
self._wbuf = ''
def __getattr__(self, name):
# Delegate to real socket attributes.
return getattr(self.sock, name)
def connect(self, *addr):
timeout = self.timeout
sock = self.sock
try:
# Non-blocking mode
sock.setblocking(0)
apply(sock.connect, addr)
sock.setblocking(timeout != 0)
return 1
except socket.error,why:
if not timeout:
raise
sock.setblocking(1)
if len(why.args) == 1:
code = 0
else:
code, why = why
if code not in (
errno.EINPROGRESS, errno.EALREADY, errno.EWOULDBLOCK
):
raise
r,w,e = select.select([],[sock],[],timeout)
if w:
try:
apply(sock.connect, addr)
return 1
except socket.error,why:
if len(why.args) == 1:
code = 0
else:
code, why = why
if code in (errno.EISCONN, WSAEINVAL):
return 1
raise
raise TimeoutError('socket connect() timeout.')
def send(self, data, flags=0):
total = len(data)
next = 0
while 1:
r, w, e = select.select([],[self.sock], [], self.timeout)
if w:
buff = data[next:next + 8192]
sent = self.sock.send(buff, flags)
next = next + sent
if next == total:
return total
continue
raise TimeoutError('socket send() timeout.')
def recv(self, amt, flags=0):
if select.select([self.sock], [], [], self.timeout)[0]:
return self.sock.recv(amt, flags)
raise TimeoutError('socket recv() timeout.')
buffsize = 4096
handles = 1
def makefile(self, mode="r", buffsize=-1):
self.handles = self.handles + 1
self.mode = mode
return self
def close(self):
self.handles = self.handles - 1
if self.handles == 0 and self.sock.fileno() >= 0:
self.sock.close()
def read(self, n=-1):
if not isinstance(n, type(1)):
n = -1
if n >= 0:
k = len(self._rbuf)
if n <= k:
data = self._rbuf[:n]
self._rbuf = self._rbuf[n:]
return data
n = n - k
L = [self._rbuf]
self._rbuf = ""
while n > 0:
new = self.recv(max(n, self.buffsize))
if not new: break
k = len(new)
if k > n:
L.append(new[:n])
self._rbuf = new[n:]
break
L.append(new)
n = n - k
return "".join(L)
k = max(4096, self.buffsize)
L = [self._rbuf]
self._rbuf = ""
while 1:
new = self.recv(k)
if not new: break
L.append(new)
k = min(k*2, 1024**2)
return "".join(L)
def readline(self, limit=-1):
data = ""
i = self._rbuf.find('\n')
while i < 0 and not (0 < limit <= len(self._rbuf)):
new = self.recv(self.buffsize)
if not new: break
i = new.find('\n')
if i >= 0: i = i + len(self._rbuf)
self._rbuf = self._rbuf + new
if i < 0: i = len(self._rbuf)
else: i = i+1
if 0 <= limit < len(self._rbuf): i = limit
data, self._rbuf = self._rbuf[:i], self._rbuf[i:]
return data
def readlines(self, sizehint = 0):
total = 0
list = []
while 1:
line = self.readline()
if not line: break
list.append(line)
total += len(line)
if sizehint and total >= sizehint:
break
return list
def writelines(self, list):
self.send(''.join(list))
def write(self, data):
self.send(data)
def flush(self):
pass
class TimeoutError(Exception):
pass