# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr

#

# This file is part of CubicWeb.

#

# CubicWeb is free software: you can redistribute it and/or modify it under the

# terms of the GNU Lesser General Public License as published by the Free

# Software Foundation, either version 2.1 of the License, or (at your option)

# any later version.

#

# CubicWeb 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 Lesser General Public License for more

# details.

#

# You should have received a copy of the GNU Lesser General Public License along

# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.

"""this module contains base classes and utilities for integration with running

http server

"""

from __future__ import with_statement

__docformat__ = "restructuredtext en"

import threading

import socket

import httplib

from twisted.internet import reactor, error

from cubicweb.etwist.server import run

from cubicweb.devtools.testlib import CubicWebTC

def get_available_port(ports_scan):

    """return the first available port from the given ports range

    Try to connect port by looking for refused connection (111) or transport

    endpoint already connected (106) errors

    Raise a RuntimeError if no port can be found

    :type ports_range: list

    :param ports_range: range of ports to test

    :rtype: int

    """

    for port in ports_scan:

        try:

            s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

            sock = s.connect(("localhost", port))

        except socket.error, err:

            if err.args[0] in (111, 106):

                return port

        finally:

            s.close()

    raise RuntimeError('get_available_port([ports_range]) cannot find an available port')

class CubicWebServerTC(CubicWebTC):

    """basic class for running test server

    :param ports_range: range of http ports to test (range(7000, 8000) by default)

    :type ports_range: iterable

    :param anonymous_logged: is anonymous user logged by default ? (True by default)

    :type anonymous_logged: bool

    :param test_url: base url used by server

    :param test_host: server host

    :param test_port: server port

    The first port found as available in `ports_range` will be used to launch

    the test server

    """

    ports_range = range(7000, 8000)

    # anonymous is logged by default in cubicweb test cases

    anonymous_logged = True

    test_host='127.0.0.1'

    @property

    def test_url(self):

        return 'http://%s:%d/' % (self.test_host, self.test_port)

    def init_server(self):

        self.test_port = get_available_port(self.ports_range)

        self.config['port'] = self.test_port

        self.config['base-url'] = self.test_url

        self.config['force-html-content-type'] = True

        self.config['pyro-server'] = False

    def start_server(self):

        self.config.pyro_enabled = lambda : False

        # use a semaphore to avoid starting test while the http server isn't

        # fully initilialized

        semaphore = threading.Semaphore(0)

        def safe_run(*args, **kwargs):

            try:

                run(*args, **kwargs)

            finally:

                semaphore.release()

        reactor.addSystemEventTrigger('after', 'startup', semaphore.release)

        t = threading.Thread(target=safe_run, name='cubicweb_test_web_server',

                             args=(self.config, self.vreg, True))

        self.web_thread = t

        if not self.anonymous_logged:

                self.config.global_set_option('anonymous-user', None)

        t.start()

        semaphore.acquire()

        if not self.web_thread.isAlive():

            # XXX race condition with actual thread death

            raise RuntimeError('Could not start the web server')

        #pre init utils connection

        self._web_test_cnx = httplib.HTTPConnection(self.test_host, self.test_port)

        self._ident_cookie = None

    def stop_server(self, timeout=15):

        """Stop the webserver, waiting for the thread to return"""

        if self._web_test_cnx is None:

            self.web_logout()

            self._web_test_cnx.close()

        try:

            reactor.stop()

            self.web_thread.join(timeout)

            assert not self.web_thread.isAlive()

        finally:

            reactor.__init__()

    def web_login(self, user=None, passwd=None):

        """Log the current http session for the provided credential

        If no user is provided, admin connection are used.

        """

        if user is None:

            user  = self.admlogin

            passwd = self.admpassword

        if passwd is None:

            passwd = user

        self.login(user)

        response = self.web_get("?__login=%s&__password=%s" %

                                (user, passwd))

        assert response.status == httplib.SEE_OTHER, response.status

        self._ident_cookie = response.getheader('Set-Cookie')

        return True

    def web_logout(self, user='admin', pwd=None):

        """Log out current http user"""

        if self._ident_cookie is not None:

            response = self.web_get('logout')

        self._ident_cookie = None

    def web_get(self, path='', headers=None):

        """Return an httplib.HTTPResponse object for the specified path

        Use available credential if available.

        """

        if headers is None:

            headers = {}

        if self._ident_cookie is not None:

            assert 'Cookie' not in headers

            headers['Cookie'] = self._ident_cookie

        self._web_test_cnx.request("GET", '/' + path, headers=headers)

        response = self._web_test_cnx.getresponse()

        response.body = response.read() # to chain request

        response.read = lambda : response.body

        return response

    def setUp(self):

        CubicWebTC.setUp(self)

        self.init_server()

        self.start_server()

    def tearDown(self):

        try:

            self.stop_server()

        except error.ReactorNotRunning, err:

            # Server could be launched manually

            print err

        CubicWebTC.tearDown(self)