import unittest
import errno
import os
import signal
import subprocess
import tempfile

import nose

import httplib2
from httplib2 import socks
from httplib2.test import miniserver

tinyproxy_cfg = """
User "%(user)s"
Port %(port)s
Listen 127.0.0.1
PidFile "%(pidfile)s"
LogFile "%(logfile)s"
MaxClients 2
StartServers 1
LogLevel Info
"""


class FunctionalProxyHttpTest(unittest.TestCase):
    def setUp(self):
        if not socks:
            raise nose.SkipTest('socks module unavailable')
        if not subprocess:
            raise nose.SkipTest('subprocess module unavailable')

        # start a short-lived miniserver so we can get a likely port
        # for the proxy
        self.httpd, self.proxyport = miniserver.start_server(
            miniserver.ThisDirHandler)
        self.httpd.shutdown()
        self.httpd, self.port = miniserver.start_server(
            miniserver.ThisDirHandler)

        self.pidfile = tempfile.mktemp()
        self.logfile = tempfile.mktemp()
        fd, self.conffile = tempfile.mkstemp()
        f = os.fdopen(fd, 'w')
        our_cfg = tinyproxy_cfg % {'user': os.getlogin(),
                                   'pidfile': self.pidfile,
                                   'port': self.proxyport,
                                   'logfile': self.logfile}
        f.write(our_cfg)
        f.close()
        try:
            # TODO use subprocess.check_call when 2.4 is dropped
            ret = subprocess.call(['tinyproxy', '-c', self.conffile])
            self.assertEqual(0, ret)
        except OSError, e:
            if e.errno == errno.ENOENT:
                raise nose.SkipTest('tinyproxy not available')
            raise

    def tearDown(self):
        self.httpd.shutdown()
        try:
            pid = int(open(self.pidfile).read())
            os.kill(pid, signal.SIGTERM)
        except OSError, e:
            if e.errno == errno.ESRCH:
                print '\n\n\nTinyProxy Failed to start, log follows:'
                print open(self.logfile).read()
                print 'end tinyproxy log\n\n\n'
            raise
        map(os.unlink, (self.pidfile,
                        self.logfile,
                        self.conffile))

    def testSimpleProxy(self):
        proxy_info = httplib2.ProxyInfo(socks.PROXY_TYPE_HTTP,
                                        'localhost', self.proxyport)
        client = httplib2.Http(proxy_info=proxy_info)
        src = 'miniserver.py'
        response, body = client.request('http://localhost:%d/%s' %
                                        (self.port, src))
        self.assertEqual(response.status, 200)
        self.assertEqual(body, open(os.path.join(miniserver.HERE, src)).read())
        lf = open(self.logfile).read()
        expect = ('Established connection to host "127.0.0.1" '
                  'using file descriptor')
        self.assertTrue(expect in lf,
                        'tinyproxy did not proxy a request for miniserver')