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# -*- coding: iso-8859-1 -*-
# Copyright (C) 2005-2010 Bastian Kleineidam
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
from __future__ import with_statement # Required in 2.5
import signal
import subprocess
import os
import socket
from nose import SkipTest
from contextlib import contextmanager
from linkcheck import LinkCheckerInterrupt
class memoized (object):
"""Decorator that caches a function's return value each time it is called.
If called later with the same arguments, the cached value is returned, and
not re-evaluated."""
def __init__(self, func):
self.func = func
self.cache = {}
def __call__(self, *args):
try:
return self.cache[args]
except KeyError:
self.cache[args] = value = self.func(*args)
return value
except TypeError:
# uncachable -- for instance, passing a list as an argument.
# Better to not cache than to blow up entirely.
return self.func(*args)
def __repr__(self):
"""Return the function's docstring."""
return self.func.__doc__
def _run (cmd):
"""Run given command without output."""
null = open(os.name == 'nt' and ':NUL' or "/dev/null", 'w')
try:
try:
return subprocess.call(cmd, stdout=null, stderr=subprocess.STDOUT)
finally:
null.close()
except OSError:
return -1
def _need_func (testfunc, name):
"""Decorator skipping test if given testfunc fails."""
def check_func (func):
def newfunc (*args, **kwargs):
if not testfunc():
raise SkipTest("%s is not available" % name)
return func(*args, **kwargs)
newfunc.func_name = func.func_name
return newfunc
return check_func
@memoized
def has_network ():
"""Test if network is up."""
try:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(("www.python.org", 80))
s.close()
return True
except StandardError:
pass
return False
need_network = _need_func(has_network, "network")
@memoized
def has_msgfmt ():
"""Test if msgfmt is available."""
return _run(["msgfmt", "-V"]) == 0
need_msgfmt = _need_func(has_msgfmt, "msgfmt")
@memoized
def has_posix ():
"""Test if this is a POSIX system."""
return os.name == "posix"
need_posix = _need_func(has_posix, "POSIX system")
@memoized
def has_clamav ():
"""Test if ClamAV daemon is installed and running."""
try:
cmd = ["grep", "LocalSocket", "/etc/clamav/clamd.conf"]
sock = subprocess.Popen(cmd, stdout=subprocess.PIPE).communicate()[0].split()[1]
if sock:
s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
s.connect(sock)
s.close()
return True
except StandardError:
pass
return False
need_clamav = _need_func(has_clamav, "ClamAV")
@memoized
def has_proxy ():
"""Test if proxy is running on port 8081."""
try:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(("localhost", 8081))
s.close()
return True
except StandardError:
pass
return False
need_proxy = _need_func(has_proxy, "proxy")
@memoized
def has_newsserver (server):
try:
import nntplib
nntp = nntplib.NNTP(server, usenetrc=False)
nntp.close()
return True
except StandardError:
return False
def need_newsserver (server):
"""Decorator skipping test if newsserver is not available."""
def check_func (func):
def newfunc (*args, **kwargs):
if not has_newsserver(server):
raise SkipTest("Newsserver `%s' is not available" % server)
return func(*args, **kwargs)
newfunc.func_name = func.func_name
return newfunc
return check_func
@memoized
def has_pyqt ():
"""Test if PyQT is installed."""
try:
import PyQt4
return True
except ImportError:
pass
return False
need_pyqt = _need_func(has_pyqt, "PyQT")
@contextmanager
def _limit_time (seconds):
"""Raises LinkCheckerInterrupt if given number of seconds have passed."""
if os.name == 'posix':
def signal_handler(signum, frame):
raise LinkCheckerInterrupt("timed out")
old_handler = signal.getsignal(signal.SIGALRM)
signal.signal(signal.SIGALRM, signal_handler)
signal.alarm(seconds)
yield
if os.name == 'posix':
signal.alarm(0)
if old_handler is not None:
signal.signal(signal.SIGALRM, old_handler)
def limit_time (seconds, skip=False):
"""Limit test time to the given number of seconds, else fail or skip."""
def run_limited (func):
def new_func (*args, **kwargs):
try:
with _limit_time(seconds):
return func(*args, **kwargs)
except LinkCheckerInterrupt, msg:
if skip:
skipmsg = "time limit of %d seconds exceeded" % seconds
raise SkipTest(skipmsg)
assert False, msg
new_func.func_name = func.func_name
return new_func
return run_limited
if __name__ == '__main__':
print has_clamav(), has_network(), has_msgfmt(), has_posix(), has_proxy()
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